U.S. patent application number 17/431244 was filed with the patent office on 2022-05-05 for 3d printing device, and method for preparing 3d printed structure.
This patent application is currently assigned to INSTITUTE OF CHEMISTRY, CHINESE ACADEMY OF SCIENCES. The applicant listed for this patent is INSTITUTE OF CHEMISTRY, CHINESE ACADEMY OF SCIENCES. Invention is credited to Yanlin Song, Lei Wu.
Application Number | 20220134635 17/431244 |
Document ID | / |
Family ID | |
Filed Date | 2022-05-05 |
United States Patent
Application |
20220134635 |
Kind Code |
A1 |
Wu; Lei ; et al. |
May 5, 2022 |
3D PRINTING DEVICE, AND METHOD FOR PREPARING 3D PRINTED
STRUCTURE
Abstract
Disclosed are a 3D printing device, and a method for preparing a
3D printed structure. The device comprises a curing system, and a
curing pattern player, a flat curing surface with de-wettability,
and a receiving base capable of moving upwards and away from the
flat curing surface, with same being successively arranged above
the curing system, wherein a curing medium provided by the curing
system passes through the curing pattern, so that ink between the
flat curing surface and the receiving base is cured.
Inventors: |
Wu; Lei; (Haidian District,
Beijing, CN) ; Song; Yanlin; (Haidian District,
Beijing, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
INSTITUTE OF CHEMISTRY, CHINESE ACADEMY OF SCIENCES |
Haidian District, Beijing |
|
CN |
|
|
Assignee: |
INSTITUTE OF CHEMISTRY, CHINESE
ACADEMY OF SCIENCES
Haidian District, Beijing
CN
|
Appl. No.: |
17/431244 |
Filed: |
March 4, 2019 |
PCT Filed: |
March 4, 2019 |
PCT NO: |
PCT/CN2019/076789 |
371 Date: |
August 16, 2021 |
International
Class: |
B29C 64/112 20060101
B29C064/112; B33Y 10/00 20060101 B33Y010/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 18, 2019 |
CN |
201910120618.4 |
Claims
1. A 3D printing device, wherein the device comprises: a curing
system; a curing pattern player; a flat curing surface with
de-wettability; and a receiving base capable of moving upwards and
away from the flat curing surface; the curing pattern player, the
flat curing surface, and the receiving base being successively
arranged above the curing system; wherein: the flat curing surface
is able to place ink droplets; and the curing pattern player is
able to project curing patterns that reflect different structural
layers of a target 3D printing structure, whereby a curing medium
provided by the curing system passes through the curing pattern, so
that the ink droplets between the flat curing surface and the
receiving base are cured.
2. The 3D printing device of claim 1, wherein the 3D printing
device further comprises a movement system which is coupled to the
receiving base for moving upwards the receiving base.
3. The 3D printing device of claim 1, wherein the 3D printing
device further comprises a computer for controlling the curing
pattern player to project the curing pattern.
4. The 3D printing device of claim 1, wherein the curing system
comprises one or more of a light-initiated curing device, a
thermally initiated curing device and an electrically initiated
curing device.
5. A method of producing a 3D printed structure with the device of
claim 1, the method comprising the following steps: (A) placing ink
droplets on a surface of the flat curing surface with
de-wettability, and passing the receiving base through the ink
droplets such that the lower end surface of the receiving base is
brought into proximity with the flat curing surface; (B) arranging
the curing pattern player to project a curing pattern, a curing
medium provided by the curing system passes through the curing
pattern, so that the ink droplets filled between the flat curing
surface and the receiving base are cured, in order to form a cured
layer with the curing pattern; (C) moving upwards the receiving
base, causing the curing pattern player to project the curing
patterns that reflect the different structural layers of a target
3D printed structure, and repeating the curing process in step (B),
thereby forming a 3D printed structure through a layer-by-layer
growth.
6. The method according to claim 5, wherein the adhesion of the
cured layer to the flat curing surface is less than 20 kPa.
7. The method according to claim 5, wherein a speed of moving the
receiving substrate up is the product of a speed of playing the
curing pattern and a thickness of the curing layer, a switching
speed of the curing pattern is 1-20 sheets/sec, and a thickness of
the cured layer is 1-20 microns/layer.
8. The method according to claim 5, wherein a dynamic contact angle
between the ink droplets and the flat curing surface is
<30.degree..
9. The method according to claim 5, wherein the curing comprises
one or more of photocuring, thermal curing and electric curing.
10. The method according to claim 5, wherein: the ink droplets are
one or more selected from the group consisting of a liquid ink
containing free ions, a photo-curable resin, a thermosetting resin
and a liquid metal; the free ions are one or more selected from the
group consisting of metal ions, inorganic ions and organic ions,
and the liquid ink is an aqueous solution, a non-aqueous solution
or a molten salt; the photosensitive wavelength of the photocurable
resin is between 200 nm and 1000 nm; the thermosetting resin has a
heat-sensitive temperature within a range of 30.degree.
C.-1,500.degree. C.; and the liquid metal is one or more of liquid
Bi, liquid Sn, liquid Pb, liquid In, and liquid Ga.
11. The method of claim 6, wherein the adhesion of the cured layer
to the flat curing surface is less than 15 kPa.
12. The method of claim 6, wherein the adhesive force between the
cured layer and the flat curing surface is less than 10 kPa.
13. The method of claim 7, wherein the switching speed of the
curing pattern is within a range of 1-5 layer/s, and the thickness
of the cured layer is within a range of 5-10 .mu.m/layer.
14. The method of claim 8, wherein the dynamic contact angle
between the ink droplets and the flat curing surface is less than
or equal to 20.degree..
15. The method of claim 8, wherein the dynamic contact angle
between the ink droplets and the flat curing surface is less than
or equal to 10.degree..
16. The method of claim 9, wherein: the photo-curing has a light
emission wavelength within a range of 300-450 nm; a curing
temperature of the thermal curing is within a range of 30.degree.
C.-300.degree. C.; and conditions of the electrical curing comprise
either static electricity with a touch discharge voltage within a
range of 8-20 kV, or static electricity with an air discharge
voltage within a range of 15-30 kV.
17. The method of claim 10, wherein: the free ions are one or more
selected from the group consisting of gold ions, silver ions,
copper ions and iron ions; the photo-curable resin has a
photosensitive wavelength within a range of 300-450 nm; and the
thermosetting resin has a heat-sensitive temperature within a range
of 30.degree. C.-300.degree. C.
18. The method of claim 10, wherein: the photo-curable resin is one
or more selected from the group consisting of polymethyl
methacrylate, polyacrylic resin, epoxy acrylic resin, polyurethane
acrylic resin, polyester acrylic resin, polyether acrylic resin,
phenolic resin, a pre-polymer of acrylonitrile-butadiene styrene
copolymer, silicone hydrogel resin, allyl resin and vinyl resin;
and the thermosetting resin is one or more selected from the group
consisting of polymethyl methacrylate, polyacrylic resin, epoxy
resin, epoxy acrylic resin, polyurethane acrylic resin, polyester
acrylic resin, polyether acrylic resin, phenolic resin,
acrylonitrile-butadiene-styrene resin, silicone hydrogel resin,
allyl resin and vinyl resin.
Description
FIELD
[0001] The present disclosure relates to the field of 3D printing,
and in particular to a 3D printing device and a method of producing
a 3D printed structure.
BACKGROUND
[0002] 3D printing, also known as an additive manufacturing
technology, is a kind of rapid prototyping technology which
constructs a three-dimensional object by means of dot-by-dot or
layer-by-layer printing on the basis of digital model files. The 3D
printing techniques up to now can be categorized into melt
extrusion rapid prototyping, photocuring stereoscopic molding,
digital light processing, foil stack fabrication, ink-jet 3D
printing, selective laser sintering, electron beam melt
fabrication, and solidification molding by special initiation
means, according to the principles of three-dimensional
prototyping. As compared with the traditional manufacturing
industry, the 3D printing techniques do not require the mold
fabrication or machining process and can avoid waste of material
and energy during the conventional subtractive manufacturing
processes. The 3D printing method based on initiation and
solidification occupies an absolute dominance of the novel 3D
printed materials, and exhibits an inherent and unique advantage in
the preparation of high-precision structures. Its initiation and
solidification process by applying the curable liquids as inks
allows the growth of to-be-printed structures from liquid
materials, thereby exploring the new sensor technologies, novel
drug delivery technologies and new lab-on-a-chip applications.
Despite these advantages, the current solidification-initiated 3D
printing methods have the deficiency that the utilization ratio of
curable liquid materials is still low, and a majority of the liquid
materials are wasted instead of being converted into the desired
structures.
[0003] After years of research finding, it has been discovered that
many processes such as chemical reactions, nanoparticle assembly
are prone to occur at the position of solid-liquid-gas three-phase
contact line, CN102627028A discloses a method for preparing
high-resolution pattern based on spontaneous dewetting of ink
droplet, specifically, inorganic nano particles, metal nano
particles, organic nano particles or polymers are dispersed in a
dispersing agent to obtain ink having a solid content within a
range of 0.0000001-70 wt %, the resulting ink then is received in a
cartridge of the ink jet printing equipment, the ink is ink-jetted
onto a base material with dewettability. The method can cause the
three-phase contact line of the ink droplets to spontaneously dewet
and retract to produce high-resolution patterns by using the
substrate with dewettability, but a use of the print cartridge
(resin tank) is required during the printing process, the solid
content of the ink is subjected to a certain requirement, which
cannot be more than 70 wt. %, resulting in low utilization rate of
curable liquid material (3D printing raw material); in addition,
the employment of a large liquid environment causes the liquid
material to form a large amount of residues on the substrate
surface, and the liquid retains in pores of the cured structure
brings about a problem that the printed structure cannot be easily
cleaned, and causing a reduced printing precision during the curing
process, and the printed structure can be easily defective.
SUMMARY
[0004] An object of the present disclosure is to overcome the
problems in the prior art that the utilization rate of 3D printing
raw materials is low, the printing precision is reduced, the
printed structure cannot be easily cleaned and is prone to be
defective, and to provide a 3D printing device and a method for
producing a 3D printed structure, such that the 3D printed
structure produced with the 3D printing device and the method of
the present disclosure has a high raw material utilization rate,
high printing precision and a desirable molding effect, and can be
easily cleaned.
[0005] In order to achieve the above-mentioned object, a first
aspect of the present disclosure provides a 3D printing device,
wherein the device comprises a curing system, and a curing pattern
player, a flat curing surface with dewettability, and a receiving
base capable of moving upwards and away from the flat curing
surface, with same being successively arranged above the curing
system, wherein
[0006] the flat curing surface is used for placing ink
droplets;
[0007] the curing pattern player is used for projecting patterns
that reflect different structural layers of a target 3D printing
structure;
[0008] a curing medium provided by the curing system passes through
the curing pattern, so that the ink liquid between the flat curing
surface and the receiving base are cured.
[0009] Preferably, the 3D printing device further comprises a
movement system coupled to the receiving base for moving upwards
the receiving base.
[0010] Preferably, the 3D printing device further comprises a
computer for controlling the curing pattern player to project the
curing pattern.
[0011] Preferably, the curing system comprises one or more of a
light-initiated curing device, a thermally initiated curing device
and an electrically initiated curing device.
[0012] In a second aspect, the present disclosure provides a method
of producing a 3D printed structure with the aforementioned device,
the method comprises the following steps:
[0013] (A) placing ink droplets on a surface of the flat curing
surface with dewettability, and passing the receiving base through
the ink droplets such that the lower end surface of the receiving
base is brought into proximity with the flat curing surface;
[0014] (B) arranging the curing pattern player to project a curing
pattern, a curing medium provided by the curing system passes
through the curing pattern, so that the ink droplets filled between
the flat curing surface and the receiving base are cured, in order
to form a cured layer with the curing pattern;
[0015] (C) moving upwards the receiving base, causing the curing
pattern player to project the curing patterns that reflect the
different structural layers of a target 3D printed structure, and
repeating the curing process in step (B), thereby forming a 3D
printed structure through a layer-by-layer growth.
[0016] Preferably, the adhesive force between the cured layer and
the flat curing surface is less than 20 kPa, preferably less than
15 kPa, more preferably less than 10 kPa.
[0017] Preferably, the dynamic contact angle between the ink
droplet and the flat curing surface is lower than or equal to
30.degree., further preferably lower than or equal to 20.degree.,
more preferably lower than or equal to 10.degree..
[0018] Compared to the conventional preparation method using a
resin tank (print cartridge), the present disclosure is based on
the dewettability of ink droplets, uses the single curable ink
droplet as a raw material, and de-wets by curing and inducing the
three-phase contact line of the ink droplet, and completely
solidifies the single ink droplet to form a 3D printed structure,
which improves the utilization rate of the printing liquid material
due to a higher curable component in the ink droplet, and in a
preferred embodiment, for example, in the case where the adhesive
force between the cured layer and the flat curing surface is less
than 20 kPa, and the dynamic contact angle between the ink droplet
and the flat curing surface is lower than or equal to 30.degree.,
the dry material utilization rate (a ratio of the weight of the 3D
printed structure to the weight of the ink droplet) can reach 80%
or more; in addition, due to the high content of the solidifiable
component, the residual liquid on a surface of the cured layer (the
already cured structure) is relatively less, thereby improving the
print precision, the prepared 3D printed structure can be easily
cleaned, the molding result is desirable, and the 3D printed
structure has less defect.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 illustrates a schematic diagram that the present
disclosure performs 3D printing by photo-curing and/or thermal
curing;
[0020] FIG. 2 illustrates a schematic diagram that the present
disclosure performs 3D printing by electrical curing.
DESCRIPTION OF REFERENCE SIGNS
[0021] 1. Curing system [0022] 2. Flat curing surface [0023] 3. Ink
droplets [0024] 4. Receiving base [0025] 5. Movement system [0026]
6. Curing pattern player
DETAILED DESCRIPTION
[0027] The terminals and any value of the ranges disclosed herein
are not limited to the precise ranges or values, such ranges or
values shall be comprehended as comprising the values adjacent to
the ranges or values. As for numerical ranges, the endpoint values
of the various ranges, the endpoint values and the individual point
value of the various ranges, and the individual point values may be
combined with one another to produce one or more new numerical
ranges, which should be deemed have been specifically disclosed
herein.
[0028] In a first aspect, the present disclosure provides a 3D
printing device, as shown in FIG. 1 and FIG. 2, the device
comprising a curing system 1, and a curing pattern player 6, a flat
curing surface 2 with dewettability, and a receiving base 4 capable
of moving upwards and away from the flat curing surface, with same
being successively arranged above the curing system 1, wherein
[0029] the flat curing surface 2 is used for placing ink
droplets;
[0030] the curing pattern player 6 is used for projecting curing
patterns that reflect different structural layers of a target 3D
printing structure;
[0031] a curing medium provided by the curing system 1 passes
through the curing pattern, so that the ink liquid between the flat
curing surface and the receiving base are cured.
[0032] In the present disclosure, the ink liquid refers to a
portion of ink droplets, and the total amount of ink liquid is the
amount of ink droplets.
[0033] In the present disclosure, a curing medium provided by the
curing system passes through the curing pattern for many times, so
as to cure the ink droplet for many times, and form a 3D printed
structure on the lower end surface of the receiving base by curing
for many times and growing layer by layer. The curing medium
provided by the curing system passes through the curing pattern for
each time to cure a portion of ink liquid of the ink droplet, form
a layer of curing pattern, such that each layer of curing pattern
has the same graph as the curing pattern projected by the curing
pattern player during a process of forming the pattern. The first
curing relates to forming a first cured layer having the same
pattern as the first curing pattern on the lower end surface of the
receiving base, moving upwards the receiving base having formed the
first cured layer and switch the curing pattern player to project
the second curing pattern; the second curing relates to forming a
second cured layer on a surface of the first cured layer, moving
upwards the receiving base having formed the first cured layer and
the second cured layer and switch the curing pattern player to
project the third curing pattern; the third curing relates to
forming a third cured layer on a surface of the second cured layer,
that is, the next curing is performed on the cured layer formed by
the previous curing process, and the curing process is repeated for
many times to form the 3D printed structure through the
layer-by-layer growth.
[0034] In a preferred embodiment of the present disclosure, the 3D
printing device further comprises a movement system 5 which is
coupled to the receiving base 2 for moving upwards the receiving
base. After forming a layer of curing pattern by each time of
curing, the receiving base is moved upwards by the movement
system.
[0035] In the present disclosure, the 3D printing device further
comprises a computer for controlling the curing pattern player to
project the curing pattern. Specifically, the computer is used for
controlling the curing pattern player to project and switch a
curing pattern.
[0036] In the present disclosure, the curing system comprises one
or more of a light-initiated curing device, a thermally initiated
curing device and an electrically initiated curing device. A
schematic diagram of performing 3D printing with an optical medium
provided by the photo-initiated curing device may be as shown in
FIG. 1, a schematic diagram of performing 3D printing with a
thermal medium provided by the thermally initiated curing device
may be as shown in FIG. 1, and a schematic diagram of performing 3D
printing with an electrical medium provided by the electrically
initiated curing device may be illustrated in FIG. 2.
[0037] In the present disclosure, the curing medium refers to one
or more selected from the group consisting of light provided by a
photo-initiated curing device, heat provided by a thermally
initiated curing device, and electricity provided by an
electrically initiated curing machine.
[0038] In a second aspect, the present disclosure provides a method
of producing a 3D printed structure with the aforementioned device,
the method comprises the following steps:
[0039] (A) placing ink droplets on a surface of the flat curing
surface with dewettability, and passing the receiving base through
the ink droplets such that the lower end surface of the receiving
base is brought into proximity with the flat curing surface;
[0040] (B) arranging the curing pattern player to project a curing
pattern, a curing medium provided by the curing system passes
through the curing pattern, so that the ink liquid filled between
the flat curing surface and the receiving base are cured, in order
to form a cured layer with the curing pattern;
[0041] (C) moving upwards the receiving base, causing the curing
pattern player to project the curing patterns that reflect the
different structural layers of a target 3D printed structure, and
repeating the curing process in step (B), thereby forming a 3D
printed structure through a layer-by-layer growth.
[0042] According to the method of the present disclosure, the term
"proximity" in step (A) means that ink liquid is filled between the
lower end surface of the receiving base and the flat curing
surface, and the amount of ink liquid is sufficient to satisfy and
form the cured layer of step (B).
[0043] In accordance with the method of the present disclosure, the
lower end surface of the receiving base may be a planar structure,
an area of the planar structure shall fulfill the purpose of
forming a robust curing layer, the area is preferably not lower
than the area of the first cured layer of step (B).
[0044] According to the method of the present disclosure, the
target 3D print structure refers to a 3D print structure to be
printed.
[0045] According to the method of the present disclosure, the
adhesive force between the cured layer and the flat curing surface
is less than 20 kPa, preferably less than 15 kPa, more preferably
less than 10 kPa. For example, the adhesive force between the cured
layer and the flat curing surface is 9 kPa, 8 kPa, 7 kPa, 6 kPa, 5
kPa, 4 kPa, 3 kPa, 2 kPa, 1 kPa, 0.8 kPa, 0.5 kPa, 0.3 kPa, 0.1
kPa, 0.01 kPa, etc.
[0046] In accordance with the method of the present disclosure, the
speed of moving upwards the receiving base is a product of the
speed of switching the curing pattern multiplying with the
thickness value of the cured layer. For example, the second cured
layer is formed when the curing pattern player switches the second
curing pattern, the speed of moving upwards the receiving base is a
product of the switching speed of the second curing pattern
multiplying with the thickness value of the second cured layer.
Specifically, for example, if the second cured layer has a
thickness of 10 .mu.m/layer, the switching speed of the second
curing pattern is 5 layer/second, and the speed of moving upwards
the receiving base is 50 .mu.m/s. In another example, if the fifth
cured layer has a thickness of 5 .mu.m/layer, and the switching
speed of the fifth curing pattern is 1 layer/second, the speed of
moving upwards the receiving base is 5 .mu.m/s.
[0047] The receiving base is moved upwards in step (C), and the
cured layer formed in step (B) "sticks" on the lower end surface of
the receiving base so as to be jointly moved upwards. The gap
formed between the cured layer and the flat curing surface is
filled with ink liquid which is applied as a raw material for the
next curing. The curing is performed layer by layer and implemented
continuously according to the same mode. The receiving base is
moved upwards continuously, and the stacked 3D printed structure is
grown layer by layer downwards and continuously on the lower end
surface of the receiving base.
[0048] According to a preferred embodiment of the present
disclosure, the switching speed of the curing pattern is within a
range of 1-20 layer per second, preferably 1-5 layer per
second.
[0049] According to a preferred embodiment of the present
disclosure, the cured layer has a thickness within a range of 1-20
.mu.m/layer, preferably 5-10 mm/layer.
[0050] According to the method of the present disclosure, the
dynamic contact angle between the ink droplet and the flat curing
surface is arranged such that it is possible to retract and de-wet
after moving upwards the receiving base, for example, the dynamic
contact angle between the ink droplet and the flat curing surface
is lower than or equal to 30.degree., preferably lower than or
equal to 20.degree., more preferably lower than or equal to
10.degree., and a dynamic contact angle between the ink droplet and
the flat curing surface may be 5.2.+-.1.4.degree.,
3.9.+-.2.1.degree., 2.2.+-.0.6.degree., 1.2.+-.0.5.degree..
Wherein, the term "dynamic contact angle" refers to the difference
between the advancing contact angle and the receding contact angle
when the ink droplet starts to slide or roll on a solid
surface.
[0051] The method of the present disclosure does not impose
specific limitation on the static contact angle between the ink
droplet and the flat curing surface, for example, the static
contact angle between the ink droplet and the flat curing surface
may be 152.4.+-.3.5.degree., 59.4.+-.2.7.degree.,
42.4.+-.2.1.degree., 39.4.+-.1.8.degree.. The term "static contact
angle" herein refers to the angle between the boundary line of the
gas-liquid and the boundary line of the liquid-solid when the ink
droplet reaches equilibrium on a solid surface, the angle is called
as the contact angle.
[0052] According to the method of the present disclosure, the
method of curing includes, but is not limited to, one or more
selected from the group consisting of photo-curing, thermal curing
and electrical curing. A schematic diagram of performing 3D
printing by photo-curing and/or thermal curing may be as shown in
FIG. 1, and a schematic diagram of performing 3D printing by
electro-curing may be as illustrated in FIG. 2.
[0053] According to an embodiment of the present disclosure, the
photo-curing may have a light emission wavelength within a range of
200-1,000 nm, preferably within a range of 300-450 nm. In
particular, the photo-curing is a curing process with ink droplet
initiated by a light having a light emission wavelength within a
range of 200-1,000 nm, preferably within a range of 300-450 nm,
wherein the ink droplet contains a light-curable resin, and by
arranging a curing pattern such that the ink liquid being identical
with the curing pattern is cured, the remaining uncured ink liquid
is allowed to de-wet and retract along with the rising of the
receiving base, the volume of the ink liquid is gradually consumed
as it is cured to form a solid structure, and the three phase
contact line of the ink droplet may retract and de-wet
simultaneously at the cured layer (the cured structure) and the
flat curing surface, thereby de-wetting the individual curable
print ink droplet and completely curing the ink droplet into the 3D
printed structure.
[0054] According to another embodiment of the present disclosure,
the temperature of thermal curing is within a range of 30.degree.
C.-1,500.degree. C., preferably within a range of 30.degree.
C.-300.degree. C. Specifically, the thermal curing refers to
initiating ink droplet at a temperature of 30.degree.
C.-1,500.degree. C., preferably 30.degree. C.-300.degree. C. to
carry out curing, wherein the ink droplet contains a thermosetting
resin or a liquid metal, and by arranging a curing pattern such
that the ink liquid being identical with the curing pattern is
cured, the remaining uncured ink liquid is allowed to de-wet and
retract along with the rising of the receiving base, the volume of
the ink liquid is gradually consumed as it is cured to form a solid
structure, and the three phase contact line of the ink droplet may
retract and de-wet simultaneously at the cured layer (the cured
structure) and the flat curing surface, thereby de-wetting the
individual curable print ink droplet and completely curing the ink
droplet into the 3D printed structure.
[0055] In accordance with another embodiment of the present
disclosure, the conditions of electrical curing comprise: direct
current or alternating current with a voltage of 12V to 220V,
static electricity with a touch discharge voltage greater than 8
kV, or static electricity with an air discharge voltage larger than
15 kV; preferably, static electricity with a touch discharge
voltage within a range of 8-20 kV, or static electricity with an
air discharge voltage within a range of 15-30 kV. Specifically, the
curing of the ink droplet is initiated under conditions of static
electricity with a touch discharge voltage greater than 8 kV, or
static electricity with an air discharge voltage larger than 15 kV;
preferably, static electricity with a touch discharge voltage
within a range of 8-20 kV, or static electricity with an air
discharge voltage within a range of 15-30 kV, wherein the liquid
ink containing free ions in the ink droplet cured the ink liquid
being identical with the curing pattern by arranging the curing
pattern, and the remaining uncured ink liquid is allowed to de-wet
and retract along with the rising of the receiving base, the volume
of the ink liquid is gradually consumed as it is cured to form a
solid structure, and the three phase contact line of the ink
droplet may retract and de-wet simultaneously at the cured layer
(the cured structure) and the flat curing surface, thereby
de-wetting the individual curable print ink droplet and completely
curing the ink droplet into the 3D printed structure.
[0056] According to the method of the present disclosure, the ink
droplets may be one or more selected from the group consisting of a
liquid ink containing free ions, a photo-curable resin, a
thermosetting resin and a liquid metal.
[0057] According to the method of the present disclosure, the free
ions are one or more selected from the group consisting of metal
ions, inorganic ions and organic ions, and the liquid ink is an
aqueous solution, a non-aqueous solution or a molten salt; further
preferably, the free ions are one or more selected from the group
consisting of gold ions, silver ions, copper ions and iron ions.
For example, an aqueous solution of gold chlorate.
[0058] According to the method of the present disclosure, the
photo-curable resin has a photosensitive wavelength within a range
of 200-1,000 nm, preferably 300-450 nm, and preferably the
photo-curable resin is one or more selected from the group
consisting of polymethyl methacrylate, polyacrylic resin, epoxy
acrylic resin, polyurethane acrylic resin, polyester acrylic resin,
polyether acrylic resin, phenolic resin, a pre-polymer of
acrylonitrile-butadiene styrene (ABS) copolymer, silicone hydrogel
resin, allyl resin and vinyl resin.
[0059] According to the method of the present disclosure, the
thermosetting resin has a heat-sensitive temperature within a range
of 30.degree. C.-1,500.degree. C., preferably 30.degree.
C.-300.degree. C.; preferably, the thermosetting resin is one or
more selected from the group consisting of polymethyl methacrylate,
polyacrylic resin, epoxy resin, epoxy acrylic resin, polyurethane
acrylic resin, polyester acrylic resin, polyether acrylic resin,
phenolic resin, acrylonitrile-butadiene-styrene (ABS) resin,
silicone hydrogel resin, allyl resin and vinyl resin.
[0060] According to the method of the present disclosure, the
liquid metal could be metals having low-melting-point. For example,
the liquid metal is one or more selected from the group consisting
of liquid bismuth (Bi), liquid Stannum (Sn), liquid Plumbum (Pb),
liquid Indium (In), and liquid Gallium (Ga).
[0061] According to the method of the present disclosure, the
material of flat curing surface may be obtained by physically
compounding and/or chemically crosslinking a silicone rubber and a
surfactant, wherein the silicone rubber is not particularly
limited. The surfactant may be a fluorine-free or
fluorine-containing surfactant. Specifically, the
fluorine-containing surfactant may be one or more selected from the
group consisting of a compound having a fluorocarbon-based backbone
or side chain structure, a fluorine-containing liquid and a
fluorine-containing solid, such as a long-chain alkane having a
side chain substituted with a fluorine atom, and more specifically,
the fluorine-containing surfactant may be
heptadecafluoro-decyl-trimethoxysilane, (trifluoromethyl)
trimethylsilane, triethylfluorosilane, and
1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone, and
the like. The fluorine-free surfactant may be one or more selected
from the group consisting of a compound having a carbon chain-based
backbone or side chain structure, an organic liquid or a solid,
such as a long-chain alkane, n-hexadecane, n-eicosane, and the
like. The ratio relationship between the silicone rubber and the
surfactant is not particularly limited, it may be 1:1, 10:1, 100:1,
for example.
[0062] Alternatively, the flat curing surface may be a
superbiconphobic surface with a Re-entrant (overhang) structure.
The Re-entrant structure may be an arrayed structure or a
non-arrayed structure obtained by micromachining etching, chemical
etching, or particle deposition. In the present disclosure, the
term "superbiconphobic surface" refers to a surface having a
contact angle greater than 150.degree. in regard to both water and
an organic liquid. The preparation method of the Re-entrant
structure pertains to the conventional method in the art, the
content will not be repeated herein.
[0063] According to the method of the present disclosure, the
receiving base may be moved by a movement system such that the
receiving base can be moved in accordance with the target 3D
printed structure.
[0064] In line with an embodiment of the present disclosure, the 3D
printing method comprises the following steps, as shown in FIG. 1
and FIG. 2:
[0065] (1) obtaining a STL file of the target 3D printing and
selecting curable print ink droplets, calculating the weight of the
desired 3D print ink droplets based on the dimensional parameters
of the STL file and the density of the ink droplets, placing the
ink droplets with corresponding weight on a surface of a flat
curing surface with dewettability, controlling the receiving base
to pass through the ink droplets by a movement system such that the
lower end surface of the receiving base is brought into proximity
with the flat curing surface.
[0066] (2) arranging a curing pattern player to project a first
curing pattern, a curing medium provided by the curing system
passes through the first curing pattern, so that the ink liquid
filled between the flat curing surface and the receiving base are
cured, so as to form a first cured layer having the first curing
pattern.
[0067] (3) moving upwards the receiving base, switching a curing
pattern of the curing pattern player according to the target 3D
printing structure, projecting a second curing pattern, a curing
medium provided by the curing system passes through the second
curing pattern, so that the ink liquid filled between the flat
curing surface and the first cured layer are cured, so as to form a
second cured layer having the second curing pattern.
[0068] Moving upwards the receiving base, switching the curing
pattern of the cured pattern player according to the target 3D
printing structure, projecting a third curing pattern, a curing
medium provided by the curing system passes through the third
curing pattern, so that the ink liquid filled between the flat
curing surface and the second cured layer are cured, so as to form
a third cured layer having the third curing pattern.
[0069] Moving upwards the receiving base, switching the curing
pattern of the cured pattern player according to the target 3D
printing structure, projecting a fourth curing pattern, a curing
medium provided by the curing system passes through the fourth
curing pattern, such that the ink liquid filled between the flat
curing surface and the third cured layer are cured, so as to form a
fourth cured layer having the fourth curing pattern.
[0070] The curing pattern player is enabled to project a curing
pattern reflecting the different structural layers of the target 3D
printed structure, and the curing process is repeated in order to
form the 3D printed structure obtained through the layer-by-layer
growth.
[0071] According to an embodiment of the present disclosure, the
use of the above-mentioned method for preparing teeth comprises the
steps of:
[0072] (1) obtaining a 3D printing STL file of a desired tooth by
analyzing the CT data, selecting curable print ink droplets,
calculating the weight of the desired 3D print ink droplets based
on the STL file and the density of the ink droplets, placing the
ink droplets with corresponding weight on a surface of a flat
curing surface with dewettability, controlling the receiving base
to pass through the ink droplets by a movement system such that the
lower end surface of the receiving base is brought into proximity
with the flat curing surface.
[0073] (2) arranging a curing pattern player to project a first
curing pattern according to the 3D printing structure of the tooth,
a curing medium provided by the curing system passes through the
first curing pattern, so that the ink liquid filled between the
flat curing surface and the receiving base are cured, so as to form
a first cured layer having the first curing pattern.
[0074] (3) moving upwards the receiving base, switching a curing
pattern of the curing pattern player according to the 3D printing
structure of the tooth, projecting a second curing pattern, a
curing medium provided by the curing system passes through the
second curing pattern, so that the ink liquid filled between the
flat curing surface and the first cured layer are cured, so as to
form a second cured layer having the second curing pattern.
[0075] Moving upwards the receiving base, switching the curing
pattern of the cured pattern player according to the 3D printing
structure of the tooth, projecting a third curing pattern, a curing
medium provided by the curing system passes through the third
curing pattern, so that the ink liquid filled between the flat
curing surface and the second cured layer are cured, so as to form
a third cured layer having the third curing pattern.
[0076] Moving upwards the receiving base, switching the curing
pattern of the cured pattern player according to the 3D printing
structure of the tooth, projecting a fourth curing pattern, a
curing medium provided by the curing system passes through the
fourth curing pattern, such that the ink liquid filled between the
flat curing surface and the third cured layer are cured, so as to
form a fourth cured layer having the fourth curing pattern.
[0077] The curing pattern player is enabled to project a curing
pattern reflecting the different structural layers of the target 3D
printed structure, and the curing process is repeated in order to
form the 3D printed structure obtained through the layer-by-layer
growth.
[0078] According to another embodiment of the present disclosure,
the above-mentioned process is used for preparing a contact lens,
the preparation steps comprising:
[0079] (1) analyzing eye morphology parameters of a wearer to
calculate a 3D printing STL file of a desired contact lens,
selecting curable print ink droplets, calculating the weight of the
desired 3D print ink droplets based on the STL file and the density
of the ink droplets, placing the ink droplets with corresponding
weight on a surface of a flat curing surface with dewettability,
controlling the receiving base to pass through the ink droplets by
a movement system such that the lower end surface of the receiving
base is brought into proximity with the flat curing surface.
[0080] (2) arranging a curing pattern player to project a first
curing pattern according to the 3D printing structure of the
contact lens, a curing medium provided by the curing system passes
through the first curing pattern, so that the ink liquid filled
between the flat curing surface and the receiving base are cured,
so as to form a first cured layer having the first curing
pattern.
[0081] (3) moving upwards the receiving base, switching a curing
pattern of the curing pattern player according to the 3D printing
structure of the contact lens, plying a second curing pattern, a
curing medium provided by the curing system passes through the
second curing pattern, so that the ink liquid filled between the
flat curing surface and the first cured layer are cured, so as to
form a second cured layer having the second curing pattern.
[0082] Moving upwards the receiving base, switching the curing
pattern of the cured pattern player according to the 3D printing
structure of the contact lens, projecting a third curing pattern, a
curing medium provided by the curing system passes through the
third curing pattern, so that the ink liquid filled between the
flat curing surface and the second cured layer are cured, so as to
form a third cured layer having the third curing pattern.
[0083] Moving upwards the receiving base, switching the curing
pattern of the cured pattern player according to the 3D printing
structure of the contact lens, projecting a fourth curing pattern,
a curing medium provided by the curing system passes through the
fourth curing pattern, such that the ink liquid filled between the
flat curing surface and the third cured layer are cured, so as to
form a fourth cured layer having the fourth curing pattern.
[0084] The curing pattern player is enabled to project a curing
pattern reflecting the different structural layers of the target 3D
printed structure, and the curing process is repeated in order to
form the 3D printed structure obtained through the layer-by-layer
growth.
[0085] The present disclosure will be specified below with
reference to the examples.
Preparation Example 1
[0086] 7.5 g of a silicone rubber material liquid (commercially
available from Dow Corning Corporation with a batch number SYLGARRD
184, wherein a ratio of the initiator to the curing agent is 10:1)
was mixed with 0.5 g of heptadecafluoro-decyl-trimethoxysilane (a
fluorine-containing surfactant purchased from Sigma-Aldrich
Company) in mechanical agitation to provide a curing plane of cure
with dewettability.
Preparation Example 2
[0087] 10 g of silicone rubber material (commercially available
from Dow Corning Corporation with a batch number SYLGARRD 160,
wherein a ratio of the initiator to the curing agent is 6:1) was
mixed with 0.1 g of (trifluoromethyl) trimethylsilane (a
fluorine-containing surfactant purchased from Acros Company) in
mechanical agitation to provide a curing plane of cure with
dewettability.
Preparation Example 3
[0088] 5 g of silicone rubber material (commercially available from
Dow Corning Corporation with a batch number SYLGARRD 170, wherein a
ratio of the initiator to the curing agent is 8:1) was mixed with 1
g of triethylfluorosilane (a fluorine-containing surfactant
purchased from Accela Company) in mechanical agitation to provide a
curing plane of cure with dewettability.
Preparation Example 4
[0089] The superomniphobic surfaces with Re-entrant structure was
prepared, the specific preparation method was formulated in the
reference literature: Tuteja A, Choi W, Ma M, et al. Designing
superoleophobic surfaces [J]. Science, 2007, 318(5856):
1618-1622.
Example 1
[0090] (1) The 3D printing STL file of a tooth was obtained by
analyzing the computerized tomography (CT), the polyurethane
acrylic resin (a photo-curable resin with a weight-average
molecular weight of 3,000 and a photosensitive wavelength of 365
nm) was used as ink droplet, the weight of the desired 3D printing
ink droplet was measured according to the STL file and the density
of the ink droplet; 1.5023 g of the ink droplets was placed on the
surface of a flat curing surface with dewettability (obtained from
the Preparation example 1), a receiving base was moved downwards by
a movement system to pass through the ink droplets, such that the
lower end surface of the receiving base was brought into proximity
with the flat curing surface, the static contact angle between the
ink droplets and the flat curing surface was 42.4.+-.2.1.degree.,
and the dynamic contact angle between the ink droplets and the flat
curing surface was 3.9.+-.2.1.degree..
[0091] (2) a curing pattern player was arranged to project a first
curing pattern according to the 3D printing structure of the tooth,
a curing medium provided by the curing system passed through the
first curing pattern, so that the ink liquid filled between the
flat curing surface and the receiving base were cured, so as to
form a first cured layer having the first curing pattern; wherein
the photo-curing had a light emission wavelength of 365 nm, the
adhesive force between the first cured layer and the flat curing
surface was 1 kPa, the adhesive force between the first cured layer
and the receiving base was 20 kPa.
[0092] (3) the receiving base was moved upwards, a curing pattern
of the curing pattern player was switched according to the 3D
printing structure of the tooth, a second curing pattern was
projected, a curing medium provided by the curing system passed
through the second curing pattern, so that the ink liquid filled
between the flat curing surface and the receiving base were cured,
and a second cured layer having the second curing pattern was
formed; wherein the photo-curing had a light emission wavelength of
365 nm, the adhesive force between the second cured layer and the
flat curing surface was 1 kPa, the adhesive force between the
second cured layer and the first cured layer was 20 kPa; wherein
the switching speed of the curing pattern was 1 layer/s, the second
cured layer had a thickness of 5 .mu.m/layer, the speed of moving
upwards the receiving base was 5 .mu.m/s. The curing pattern player
was caused to project a curing pattern reflecting the different
structural layers of the target 3D printed structure, and the
curing process was repeated in order to form the 3D printed
structure of the tooth obtained through the layer-by-layer
growth.
[0093] The utilization rate of the dry state materials was
calculated
[0094] Direct weighing was performed, yielding a 3D printing
structure was measured with a weight of 1.4993 g, a calculation was
carried out according to formula I, the utilization rate of the dry
state materials was 99.8%.
The .times. .times. utilizatoin .times. .times. rate .times.
.times. of .times. .times. dry .times. .times. state .times.
.times. materials = the .times. .times. weight .times. .times. of
.times. .times. 3 .times. .times. D .times. .times. printing
.times. .times. structure the .times. .times. weight .times.
.times. of .times. .times. ink .times. .times. droplets .times. 100
.times. % ( formula .times. .times. I ) ##EQU00001##
[0095] Furthermore, the surface and internal structure of the 3D
printing structure were observed by a scanning electron microscope
(commercially available from the Japan-based JEOL company with the
model number JSM-7500), the prepared 3D printing structure produced
had a desirable molding effect, the 3D printing structure had less
defect and can be easily cleaned.
Example 2
[0096] (1) The 3D printing STL file of a tooth was obtained by
analyzing the computerized tomography (CT), the epoxy resin (a
thermosetting resin with a weight-average molecular weight of 4,000
and a thermo-sensitive temperature of 150.degree. C.) was used as
ink droplet, the weight of the desired 3D printing ink droplet was
measured according to the STL file and the density of the ink
droplet; 1.4723 g of the ink droplets was placed on the surface of
a flat curing surface with dewettability (obtained from the
Preparation example 2), a receiving base was moved downwards by a
movement system to pass through the ink droplets, such that the
lower end surface of the receiving base was brought into proximity
with the flat curing surface, the static contact angle between the
ink droplets and the flat curing surface was 39.4.+-.1.8.degree.,
and the dynamic contact angle between the ink droplets and the flat
curing surface was 5.2.+-.1.4.degree..
[0097] (2) a curing pattern player was arranged to project a first
curing pattern according to the 3D printing structure of the tooth,
a curing medium provided by the curing system passed through the
first curing pattern, so that the ink liquid filled between the
flat curing surface and the receiving base were cured, so as to
form a first cured layer having the first curing pattern; wherein
the temperature of thermal curing was 150.degree. C., the adhesive
force between the first cured layer and the flat curing surface was
0.1 kPa, the adhesive force between the first cured layer and the
receiving base was 25 kPa.
[0098] (3) the receiving base was moved upwards, a curing pattern
of the curing pattern player was switched according to the 3D
printing structure of the tooth, a second curing pattern was
projected, a curing medium provided by the curing system passed
through the second curing pattern, so that the ink liquid filled
between the flat curing surface and the receiving base were cured,
and a second cured layer having the second curing pattern was
formed; wherein the temperature of thermal curing was 150.degree.
C., the adhesive force between the second cured layer and the flat
curing surface was 0.1 kPa, the adhesive force between the second
cured layer and the first cured layer was 200 kPa; wherein the
switching speed of the curing pattern was 5 layer/s, the second
cured layer had a thickness of 10 .mu.m/layer, the speed of moving
upwards the receiving base was 50 .mu.m/s. The curing pattern
player was caused to project a curing pattern reflecting the
different structural layers of the target 3D printed structure, and
the curing process was repeated in order to form the 3D printed
structure of the tooth obtained through the layer-by-layer
growth.
[0099] The utilization rate of the dry state materials was
calculated
[0100] The utilization rate of the dry state materials was measured
to be 96.5% after performing detection according to the method of
Example 1.
[0101] Upon detection according to the method of Example 1, the
prepared 3D printing structure can be easily cleaned, it had a
desirable molding effect and less defect.
Example 3
[0102] (1) The 3D printing STL file of a tooth was obtained by
analyzing the computerized tomography (CT), an aqueous solution of
gold chlorate (wherein the gold chlorate was contained in an amount
of 5 wt. %) was used as ink droplet, the weight of the desired 3D
printing ink droplet was measured according to the STL file and the
density of the ink droplet; 1.8934 g of the ink droplets was placed
on the surface of a flat curing surface with dewettability
(obtained from the Preparation example 3), a receiving base was
moved downwards by a movement system to pass through the ink
droplets, such that the lower end surface of the receiving base was
brought into proximity with the flat curing surface, the static
contact angle between the ink droplets and the flat curing surface
was 59.4.+-.2.7.degree., and the dynamic contact angle between the
ink droplets and the flat curing surface was
2.2.+-.0.6.degree..
[0103] (2) a curing pattern player was arranged to project a first
curing pattern according to the 3D printing structure of the tooth,
a curing medium provided by the curing system passed through the
first curing pattern, so that the ink liquid filled between the
flat curing surface and the receiving base were cured, so as to
form a first cured layer having the first curing pattern; wherein
the electrical curing related to static electricity with a touch
discharge voltage of 20 kV, the adhesive force between the first
cured layer and the flat curing surface was 0.5 kPa, the adhesive
force between the first cured layer and the receiving base was 5
kPa.
[0104] (3) the receiving base was moved upwards, a curing pattern
of the curing pattern player was switched according to the 3D
printing structure of the tooth, a second curing pattern was
projected, a curing medium provided by the curing system passed
through the second curing pattern, so that the ink liquid filled
between the flat curing surface and the receiving base were cured,
and a second cured layer having the second curing pattern was
formed; wherein the electrical curing related to static electricity
with a touch discharge voltage of 20 kV, the adhesive force between
the second cured layer and the flat curing surface was 0.5 kPa, the
adhesive force between the second cured layer and the first cured
layer was 5 kPa; wherein the switching speed of the curing pattern
was 20 layer/s, the second cured layer had a thickness of 1
.mu.m/layer, the speed of moving upwards the receiving base was 20
.mu.m/s. The curing pattern player was caused to project a curing
pattern reflecting the different structural layers of the target 3D
printed structure, and the curing process was repeated in order to
form the 3D printed structure of the tooth obtained through the
layer-by-layer growth.
[0105] The utilization rate of the dry state materials was
calculated
[0106] The utilization rate of the dry state materials was measured
to be 94.1% after performing detection according to the method of
Example 1.
[0107] Upon detection according to the method of Example 1, the
prepared 3D printing structure can be easily cleaned, it had a
desirable molding effect and less defect.
Example 4
[0108] (1) The 3D printing STL file of a tooth was obtained by
analyzing the computerized tomography (CT), the polyurethane
acrylic resin (a photo-curable resin with a weight average
molecular weight of 6,000 and a light-sensitive wavelength of 405
nm) was used as ink droplet, the weight of the desired 3D printing
ink droplet was measured according to the STL file and the density
of the ink droplet; 3.1245 g of the ink droplets was placed on the
surface of a flat curing surface with dewettability (obtained from
the Preparation example 4), a receiving base was moved downwards by
a movement system to pass through the ink droplets, such that the
lower end surface of the receiving base was brought into proximity
with the flat curing surface, the static contact angle between the
ink droplets and the flat curing surface was 152.4.+-.3.5.degree.,
and the dynamic contact angle between the ink droplets and the flat
curing surface was 1.2.+-.0.5.degree..
[0109] (2) a curing pattern player was arranged to project a first
curing pattern according to the 3D printing structure of the tooth,
a curing medium provided by the curing system passed through the
first curing pattern, so that the ink liquid filled between the
flat curing surface and the receiving base were cured, so as to
form a first cured layer having the first curing pattern; wherein
the photo-curing had a light emission wavelength of 405 nm, the
adhesive force between the first cured layer and the flat curing
surface was 0.01 kPa, the adhesive force between the first cured
layer and the receiving base was 20 kPa.
[0110] (3) the receiving base was moved upwards, a curing pattern
of the curing pattern player was switched according to the 3D
printing structure of the tooth, a second curing pattern was
projected, a curing medium provided by the curing system passed
through the second curing pattern, so that the ink liquid filled
between the flat curing surface and the receiving base were cured,
and a second cured layer having the second curing pattern was
formed; wherein the photo-curing had a light emission wavelength of
405 nm, the adhesive force between the second cured layer and the
flat curing surface was 0.01 kPa, the adhesive force between the
second cured layer and the first cured layer was 135 kPa; wherein
the switching speed of the curing pattern was 1 layer/s, the second
cured layer had a thickness of 20 .mu.m/layer, the speed of moving
upwards the receiving base was 20 .mu.m/s. The curing pattern
player was caused to project a curing pattern reflecting the
different structural layers of the target 3D printed structure, and
the curing process was repeated in order to form the 3D printed
structure of the tooth obtained through the layer-by-layer
growth.
[0111] The utilization rate of the dry state materials was
calculated
[0112] The utilization rate of the dry state materials was measured
to be 94.9% after performing detection according to the method of
Example 1.
[0113] Upon detection according to the method of Example 1, the
prepared 3D printing structure can be easily cleaned, it had a
desirable molding effect and less defect.
Example 5
[0114] (1) The 3D printing STL file of a tooth was obtained by
analyzing the computerized tomography (CT), the polymethyl
methacrylate resin (a photo-curable resin with a weight average
molecular weight of 5,000 and a light-sensitive wavelength of 365
nm) was used as ink droplet, the weight of the desired 3D printing
ink droplet was measured according to the STL file and the density
of the ink droplet; 3.2341 g of the ink droplets was placed on the
surface of a flat curing surface with dewettability (obtained from
the Preparation example 1), a receiving base was moved downwards by
a movement system to pass through the ink droplets, such that the
lower end surface of the receiving base was brought into proximity
with the flat curing surface, the static contact angle between the
ink droplets and the flat curing surface was 59.4.+-.2.7.degree.,
and the dynamic contact angle between the ink droplets and the flat
curing surface was 2.2.+-.0.6.degree..
[0115] (2) a curing pattern player was arranged to project a first
curing pattern according to the 3D printing structure of the tooth,
a curing medium provided by the curing system passed through the
first curing pattern, so that the ink liquid filled between the
flat curing surface and the receiving base were cured, so as to
form a first cured layer having the first curing pattern; wherein
the photo-curing had a light emission wavelength of 365 nm, the
adhesive force between the first cured layer and the flat curing
surface was 0.5 kPa, the adhesive force between the first cured
layer and the receiving base was 20 kPa.
[0116] (3) the receiving base was moved upwards, a curing pattern
of the curing pattern player was switched according to the 3D
printing structure of the tooth, a second curing pattern was
projected, a curing medium provided by the curing system passed
through the second curing pattern, so that the ink liquid filled
between the flat curing surface and the receiving base were cured,
and a second cured layer having the second curing pattern was
formed; wherein the photo-curing had a light emission wavelength of
365 nm, the adhesive force between the second cured layer and the
flat curing surface was 0.5 kPa, the adhesive force between the
second cured layer and the first cured layer was 135 kPa; wherein
the switching speed of the curing pattern was 3 layer/s, the second
cured layer had a thickness of 10 .mu.m/layer, the speed of moving
upwards the receiving base was 30 .mu.m/s. The curing pattern
player was caused to project a curing pattern reflecting the
different structural layers of the target 3D printed structure, and
the curing process was repeated in order to form the 3D printed
structure of the tooth obtained through the layer-by-layer
growth.
[0117] The utilization rate of the dry state materials was
calculated
[0118] The utilization rate of the dry state materials was measured
to be 94.5% after performing detection according to the method of
Example 1.
[0119] Upon detection according to the method of Example 1, the
prepared 3D printing structure can be easily cleaned, it had a
desirable molding effect and less defect.
Example 6
[0120] (1) the eye morphology parameters of a wearer was analyzed
to calculate a 3D printing STL file of a desired contact lens, the
light-curable silicone hydrogel resin (a photo-curable resin with a
weight average molecular weight of 3,000 and a light-sensitive
wavelength of 365 nm) was used as ink droplet, the weight of the
desired 3D printing ink droplet was measured according to the STL
file and the density of the ink droplet; 0.5126 g of the ink
droplets was placed on the surface of a flat curing surface with
dewettability (obtained from the Preparation example 1), a
receiving base was moved downwards by a movement system to pass
through the ink droplets, such that the lower end surface of the
receiving base was brought into proximity with the flat curing
surface, the static contact angle between the ink droplets and the
flat curing surface was 59.4.+-.2.7.degree., and the dynamic
contact angle between the ink droplets and the flat curing surface
was 2.2.+-.0.6.degree..
[0121] (2) a curing pattern player was arranged to project a first
curing pattern according to the 3D printing structure of the
contact lens, a curing medium provided by the curing system passed
through the first curing pattern, so that the ink liquid filled
between the flat curing surface and the receiving base were cured,
so as to form a first cured layer having the first curing pattern;
wherein the photo-curing had a light emission wavelength of 365 nm,
the adhesive force between the first cured layer and the flat
curing surface was 0.5 kPa, the adhesive force between the first
cured layer and the receiving base was 10 kPa.
[0122] (3) the receiving base was moved upwards, a curing pattern
of the curing pattern player was switched according to the 3D
printing structure of the contact lens, a second curing pattern was
projected, a curing medium provided by the curing system passed
through the second curing pattern, so that the ink liquid filled
between the flat curing surface and the receiving base were cured,
and a second cured layer having the second curing pattern was
formed; wherein the photo-curing had a light emission wavelength of
365 nm, the adhesive force between the second cured layer and the
flat curing surface was 0.5 kPa, the adhesive force between the
second cured layer and the first cured layer was 10 kPa; wherein
the switching speed of the curing pattern was 3 layer/s, the second
cured layer had a thickness of 10 .mu.m/layer, the speed of moving
upwards the receiving base was 30 .mu.m/s. The curing pattern
player was caused to project a curing pattern reflecting the
different structural layers of the target 3D printed structure, and
the curing process was repeated in order to form the 3D printed
structure of the contact lens obtained through the layer-by-layer
growth.
[0123] The utilization rate of the dry state materials was
calculated
[0124] The utilization rate of the dry state materials was measured
to be 93.9% after performing detection according to the method of
Example 1.
[0125] Upon detection according to the method of Example 1, the
prepared 3D printing structure can be easily cleaned, it had a
desirable molding effect and less defect.
Comparative Example 1
[0126] The same method as that of Example 1 was performed to
prepare the 3D printing structure, except that the flat curing
surface lacks dewettability, the results indicated that the 3D
printed structure cannot be formed.
Comparative Example 2
[0127] The 3D printing structure was prepared according to the same
method as that of CN102627028A, the specific method was as
follows:
[0128] the polyurethane acrylic resin was dispersed in a mixed
solution consisting of water and glycerin in a weight fraction
ratio of 2:1 to obtain an ink, the obtained ink was then filled in
a cartridge of the spray ink printing equipment, and the ink was
sprayed by the spray ink printing equipment to a base material with
dewettability. The spray ink printing equipment was moved by a
movement drive system according to a desired 3D printing structure,
so as to finally obtain the 3D printing structure.
[0129] The utilization rate of the dry state materials was measured
to be 30% after performing detection according to the method of
Example 1.
[0130] Upon detection according to the method of Example 1, the
prepared 3D printing structure had a poor molding effect and many
defects.
[0131] As can be seen from the results of Examples and Comparative
examples, the examples of 3D printed structures produced with the
method of the present disclosure can cure the single printing ink
droplet to form a 3D printed structure, and the utilization rate of
the printing liquid material is high; in a preferred embodiment,
for example, in the case where the adhesive force between the cured
layer and the flat curing surface is not more than 20 kPa, and the
dynamic contact angle between the ink droplet and the flat curing
surface is lower than or equal to 30.degree., the utilization rate
of dry state materials (a ratio of the weight of the 3D printed
structure to the weight of the ink droplets) may reach 80% or more,
and the prepared 3D printed structure can be easily cleaned, the
molding result is desirable, and the 3D printed structure has less
defect.
[0132] The above content describes in detail the preferred
embodiments of the present disclosure, but the present disclosure
is not limited thereto. A variety of simple modifications can be
made in regard to the technical solutions of the present disclosure
within the scope of the technical concept of the present
disclosure, including a combination of individual technical
features in any other suitable manner, such simple modifications
and combinations thereof shall also be regarded as the content
disclosed by the present disclosure, each of them falls into the
protection scope of the present disclosure.
* * * * *