U.S. patent application number 16/047513 was filed with the patent office on 2018-11-22 for slurry for manufacturing graphene sheet combining graphite flake structure.
The applicant listed for this patent is NITRONIX INTERNATIONAL HOLDINGS LIMITED. Invention is credited to Chih-Chieh CHAN, Hsiu-Pin CHANG, Tung CHOU, Lain-Jong LI, Wen-Hsien LIAO, Jonathan ROSS, Feng-Yu WU.
Application Number | 20180334604 16/047513 |
Document ID | / |
Family ID | 58103907 |
Filed Date | 2018-11-22 |
United States Patent
Application |
20180334604 |
Kind Code |
A1 |
CHOU; Tung ; et al. |
November 22, 2018 |
SLURRY FOR MANUFACTURING GRAPHENE SHEET COMBINING GRAPHITE FLAKE
STRUCTURE
Abstract
A slurry for manufacturing a graphene sheet combining graphite
flake structure includes a solvent, a graphite nanoplatelet
material and a graphene material. The graphite nanoplatelet
material includes a plurality of graphite nanoplatelets. The
graphene material comprising a plurality of graphenes. The graphite
nanoplatelet material and the graphene material is mixed in the
solvent, a weight percentage of the graphite nanoplatelet material
is between 0.1% and 10%, and the content of the graphene material
is between 1% and 80% of the graphite nanoplatelet material.
Inventors: |
CHOU; Tung; (New Taipei
City, TW) ; WU; Feng-Yu; (New Taipei City, TW)
; CHAN; Chih-Chieh; (New Taipei City, TW) ; LIAO;
Wen-Hsien; (New Taipei City, TW) ; CHANG;
Hsiu-Pin; (New Taipei City, TW) ; LI; Lain-Jong;
(New Taipei City, TW) ; ROSS; Jonathan; (New
Taipei City, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NITRONIX INTERNATIONAL HOLDINGS LIMITED |
Apia |
|
WS |
|
|
Family ID: |
58103907 |
Appl. No.: |
16/047513 |
Filed: |
July 27, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
15255477 |
Sep 2, 2016 |
10066141 |
|
|
16047513 |
|
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C09D 7/80 20180101; B82Y
40/00 20130101; C09D 1/00 20130101; C01B 32/19 20170801; C08K 3/042
20170501; H01B 1/04 20130101; B82Y 30/00 20130101; H01B 1/24
20130101; C09D 7/70 20180101; C09D 7/61 20180101; C09K 5/14
20130101 |
International
Class: |
C09K 5/14 20060101
C09K005/14; C01B 32/19 20170101 C01B032/19; C09D 7/61 20180101
C09D007/61; C09D 1/00 20060101 C09D001/00; H01B 1/24 20060101
H01B001/24; H01B 1/04 20060101 H01B001/04; C09D 7/80 20180101
C09D007/80; C09D 7/40 20180101 C09D007/40 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 2, 2015 |
TW |
104128974 |
Claims
1. A slurry for manufacturing a graphene sheet combining graphite
flake structure, comprising: a solvent; a graphite nanoplatelet
material comprising a plurality of graphite nanoplatelets; and a
graphene material comprising a plurality of graphenes; wherein, the
graphite nanoplatelet material and the graphene material are mixed
in the solvent, a weight percentage of the graphite nanoplatelet
material is between 0.1% and 10%, and the content of the graphene
material is between 1% and 80% of the graphite nanoplatelet
material.
2. The slurry of claim 1, wherein a weight percentage of the
graphite nanoplatelet material is between 0.2% and 10%.
3. The slurry of claim 1, wherein a size of the graphite
nanoplatelets is between 5 .mu.m and 200 .mu.m.
4. The slurry of claim 1, wherein a thickness of the graphite
nanoplatelets is between 0.1 .mu.m and 0.5 .mu.m.
5. The slurry of claim 1, wherein a size of the graphenes is
between 1 .mu.m and 50 .mu.m.
6. The slurry of claim 1, wherein a thickness of the graphenes is
between 0.002 .mu.m and 0.02 .mu.m.
7. The slurry of claim 1, wherein a thickness of the manufactured
graphene sheet combining graphite flake structure is between 2
.mu.m and 100 .mu.m.
8. The slurry of claim 1, wherein the manufactured graphene sheet
combining graphite flake structure is flexible.
9. The slurry of claim 1, wherein the solvent is water,
dimethylformamide (DMF), tetrahydrofuran (THF), ketones, alcohols,
acetic acid acetate, or toluene.
10. The slurry of claim 9, wherein the ketones comprises
N-methylpyrrolidone (NMP) or acetone, and the alcohols comprises
ethanol or ethylene glycol.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Divisional Application of an earlier
filed, pending, application, having application Ser. No. 15/255,477
and filed on Sep. 2, 2016, the content of which, including
drawings, is expressly incorporated by reference herein.
BACKGROUND OF THE INVENTION
Field of Invention
[0002] The present invention relates to a graphene sheet combining
graphite flake structure and its manufacturing method, and a slurry
for manufacturing the graphene sheet combining graphite flake
structure.
Related Art
[0003] As the progress of technology, the electronic devices are
designed and developed to the goals of thinner and higher
performance. Under the demands of high speed calculation, the
electronic components of the electronic device will generate more
heat. However, the higher temperature may affect the properties of
the electronic components. Moreover, it the operation temperature
is too high, the electronic components may have permanent
damages.
[0004] The conventional heat-dissipating device has a planar
surface for attaching to the top of the heat source. If the
heat-dissipating device is not flexible, it cannot fit the
irregular shape of the heat source. That is, the heat-dissipating
device may not attach to the surface of the heat source as large as
possible, thereby reducing the heat dissipating performance.
[0005] Therefore, it is an important subject to provide a
heat-dissipating structure with a flexible property and a better
heat conducting effect.
SUMMARY OF THE INVENTION
[0006] An objective of the present invention is to provide a
graphene sheet combining graphite flake structure and its
manufacturing method, and a slurry for manufacturing the graphene
sheet combining graphite flake structure. The graphene sheet
combining graphite flake structure of the invention has a flexible
property and a better heat conducting effect. Besides, the graphene
sheet combining graphite flake structure of the invention further
has an electromagnetic shielding effect. Moreover, since the
graphene sheet combining graphite flake structure of the invention
contains the graphene material, it will have high heat and electric
conductivities, excellent flexibility, and stronger structure.
[0007] To achieve the above objective, the present invention
discloses a graphene sheet combining graphite flake structure,
which includes a graphite nanoplatelet material and a graphene
material mixed in the graphite nanoplatelet material. The content
of the graphene material is between 1% and 80% of the graphite
nanoplatelet material.
[0008] To achieve the above objective, the present invention also
discloses a manufacturing method of a graphene sheet combining
graphite flake structure. The manufacturing method includes the
following steps of: adding a graphite nanoplatelet material into a
solvent and stirring to form a well-mixed solution, wherein a
weight percentage of the graphite nanoplatelet material is between
0.1% and 10%; adding a graphene material in the solution and
stirring to form a well-mixed slurry, wherein the content of the
graphene material is between 1% and 80% of the graphite
nanoplatelet material; applying the slurry on an object and drying
the slurry to form a graphite coating; and pressing the graphite
coating to form the graphene sheet combining graphite flake
structure.
[0009] To achieve the above objective, the present invention
further discloses a slurry for manufacturing a graphene sheet
combining graphite flake structure. The slurry includes a solvent,
a graphite nanoplatelet material and a graphene material. The
graphite nanoplatelet material includes a plurality of graphite
nanoplatelets. The graphene material is mixed with the graphite
nanoplatelet material in the solvent. A weight percentage of the
graphite nanoplatelet material is between 0.1% and 10%, and the
content of the graphene material is between 1% and 80% of the
graphite nanoplatelet material.
[0010] In one embodiment, the graphite nanoplatelet material
includes a plurality of graphite nanoplatelets. The size of the
graphite nanoplatelets is between 5 .mu.m and 200 .mu.m, and the
thickness of the graphite nanoplatelets is between 0.1 .mu.m and
0.5 .mu.m.
[0011] In one embodiment, the graphene material includes a
plurality of graphenes. The size of the graphenes is between 1
.mu.m and 50 .mu.m, and the thickness of the graphenes is between
0.002 .mu.m and 0.02 .mu.m.
[0012] In one embodiment, the thickness of the graphene sheet
combining graphite flake structure is between 2 .mu.m and 100
.mu.m.
[0013] In one embodiment, the graphene sheet combining graphite
flake structure is flexible.
[0014] In one embodiment, a thickness of the graphite coating is
between 10 .mu.m and 500 .mu.m.
[0015] In one embodiment, the solvent is water, dimethylformamide
(DMF), tetrahydrofuran (THF), ketones, alcohols, acetic acid
acetate, or toluene.
[0016] In one embodiment, the ketones comprises N-methylpyrrolidone
(NMP) or acetone, and the alcohols comprises ethanol or ethylene
glycol.
[0017] In one embodiment, a weight percentage of the graphite
nanoplatelet material is between 0.2% and 10%.
[0018] In one embodiment, the slurry is applied by a coating method
or a printing method.
[0019] In one embodiment, the coating method comprises a spray
coating or a spin coating, and the printing method comprises an
inkjet printing or a screen printing.
[0020] In one embodiment, the applied slurry is dried at a
temperature lower than 400.degree. C. for 1 minute to 24 hours.
[0021] In one embodiment, the manufacturing method further includes
a step of: departing the graphene sheet combining graphite flake
structure from the object.
[0022] As mentioned above, the graphene sheet combining graphite
flake structure contains a graphite nanoplatelet material and a
graphene material mixed in the graphite nanoplatelet material. The
content of the graphene material is between 1% and 80% of the
graphite nanoplatelet material. In addition, the slurry of the
invention contains a solvent, a graphite nanoplatelet material and
a graphene material, and the graphite nanoplatelet material and the
graphene material are mixed in the solvent. The weight percentage
of the graphite nanoplatelet material is between 0.1% and 10%, and
the content of the graphene material is between 1% and 80% of the
graphite nanoplatelet material. Since the graphite nanoplatelet
material and graphene material contained in the graphene sheet
combining graphite flake structure and the slurry have good heat
conductivity, the heat can be rapidly dissipated from the heat
source. Accordingly, the graphene sheet combining graphite flake
structure of the invention has better heat conducting effect.
Besides, the graphene material allows the graphene sheet combining
graphite flake structure to have a flexible property, so that the
entire structure becomes stronger.
[0023] In addition, the graphene sheet combining graphite flake
structure of the invention can fit the heat sources with different
shapes, or it can be attached to a heat source with a large
surface. This feature can satisfy the high heat-dissipation
requirements of the electronic devices with different shapes.
Moreover, the graphene sheet combining graphite flake structure of
the invention further has an electromagnetic shielding effect.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The invention will become more fully understood from the
detailed description and accompanying drawings, which are given for
illustration only, and thus are not limitative of the present
invention, and wherein:
[0025] FIG. 1 is a flow chart of a manufacturing method of a
graphene sheet combining graphite flake structure according to an
embodiment of the invention;
[0026] FIGS. 2A to 2G are schematic diagrams showing the
manufacturing procedures of the graphene sheet combining graphite
flake structure according to the embodiment of the invention;
[0027] FIG. 3 is a flow chart of another manufacturing method of a
graphene sheet combining graphite flake structure according to the
embodiment of the invention; and
[0028] FIG. 4 is a schematic diagram showing the graphene sheet
combining graphite flake structure according to the embodiment of
the invention viewing from an SEM.
DETAILED DESCRIPTION OF THE INVENTION
[0029] The present invention will be apparent from the following
detailed description, which proceeds with reference to the
accompanying drawings, wherein the same references relate to the
same elements.
[0030] FIG. 1 is a flow chart of a manufacturing method of a
graphene sheet combining graphite flake structure 1 according to an
embodiment of the invention, and FIGS. 2A to 2G are schematic
diagrams showing the manufacturing procedures of the graphene sheet
combining graphite flake structure 1 according to the embodiment of
the invention.
[0031] As shown in FIG. 1, the manufacturing method of a graphene
sheet combining graphite flake structure 1 includes the following
steps of: adding a graphite nanoplatelet material into a solvent
and stirring to form a well-mixed solution, wherein a weight
percentage of the graphite nanoplatelet material is between 0.1%
and 10% (step S01); adding a graphene material in the solution and
stirring to form a well-mixed slurry, wherein the content of the
graphene material is between 1% and 80% of the graphite
nanoplatelet material (step S02); applying the slurry on an object
and drying the slurry to form a graphite coating (step S03); and
pressing the graphite coating to form the graphene sheet combining
graphite flake structure (step S04). The detailed manufacturing
procedures will be illustrated hereinafter with reference to FIGS.
2A to 2G.
[0032] As shown in FIG. 2A, the step S01 is to add a graphite
nanoplatelet material 11 into a solvent S and to stir to form a
well-mixed solution. The weight percentage of the graphite
nanoplatelet material 11 is between 0.1% and 10%, and is,
preferably, between 0.2% and 10%. In this embodiment, the graphite
nanoplatelet material 11 is powder containing a plurality of
graphite nanoplatelets. The size of the graphite nanoplatelets is
between 5 .mu.m and 200 .mu.m, and the thickness of the graphite
nanoplatelets is between 0.1 .mu.m and 0.5 .mu.m. The solvent S is,
for example, water, dimethylformamide (DMF), tetrahydrofuran (THF),
ketones, alcohols, acetic acid acetate, or toluene. In this
embodiment, the solvent S is water. In some embodiments, the
ketones includes N-methylpyrrolidone (NMP) or acetone, and the
alcohols includes ethanol or ethylene glycol. In addition, the
solvent S can be a mixture containing any of the above solvents or
their combinations, and this invention is not limited. In some
embodiments, the solvent S may also contain a resin adhesive such
as, for example but not limited to, polyester, acrylic resin,
aqueous phase acrylic resin, polyurethane, aqueous phase
polyurethane, or polyvinylidene fluoride. This invention is not
limited. Of course, the resin adhesive can be any polar and
non-polar adhesive, and it is 5% of the solvent S or less.
[0033] As shown in FIG. 2B, the step S02 is to add a graphene
material 12 in the solution and to stir the solution to form a
well-mixed slurry. Herein, the content of the graphene material 12
is between 1% and 80% of the graphite nanoplatelet material 11. In
practice, the solution is stirred for 5 to 30 minutes so as to mix
the graphite nanoplatelet material 11, the graphene material 12 and
the solvent S to form a slurry. The graphene material 12 is
basically composed of graphene, such as natural or artificial
graphite compounds. The graphene material 12 includes a plurality
of graphene particles. The size of the graphene particles is
between 1 .mu.m and 50 .mu.m, and the thickness of the graphene
particles is between 0.002 .mu.m and 0.02 .mu.m. In some
embodiments, the graphene material 12 is added to the solvent S,
and the solution is stirred. Then, the graphite nanoplatelet
material 11 is added to the well-mixed solution, and the solution
is stirred again. Alternatively, the graphite nanoplatelet material
11 and the graphene material 12 are added to the solvent S
simultaneously, and the solution is stirred. This invention is not
limited.
[0034] Accordingly, the slurry prepared by the steps S01 and S02
contains the solvent S, the graphite nanoplatelet material 11 and
the graphene material 12, which are mixed to form a viscus slurry
(like jelly). In this slurry, the weight percentage of the graphite
nanoplatelet material 11 is between 0.1% and 10% and, preferably,
is between 0.2% and 10%, and the content of the graphene material
12 is between 1% and 80% of the graphite nanoplatelet material
11.
[0035] Referring to FIG. 2C, the step S03 is to apply the slurry on
an object O and to dry the slurry to form a graphite coating 13. In
this step, the object O is, for example but not limited to, a
polymer, metal, ceramic, paper, or cloth substrate, and the slurry
can be applied by a coating method or a printing method. In
practice, the coating method includes a spray coating or a spin
coating, and the printing method includes an inkjet printing or a
screen printing. This invention is not limited. The thickness d1 of
the graphite coating (the applied slurry by coating or printing) is
between 10 .mu.m and 500 .mu.m. In addition, during the drying
procedure, the object O applied with the slurry can be placed in an
oven and baked to remove the solvent S (e.g. water) contained in
the slurry S so as to form a graphite coating 13. To be noted, the
drying temperature must be lower than 500.degree. C. and higher
than the room temperature for 1 minute to 24 hours. As shown in
FIG. 2D, after the drying procedure, the thickness d2 of the dried
graphite coating 13a is between 10 .mu.m and 500 .mu.m.
[0036] With reference to FIG. 2E, the step S04 is to press the
graphite coating 13(13a) to form the graphene sheet combining
graphite flake structure 1. In this embodiment, the graphite
coating 13a is pressed by a roller R so as to obtain the desired
graphene sheet combining graphite flake structure 1 on the object
O.
[0037] In different embodiments, the object O is not a planar
object. For example, as shown in FIG. 2G the object O1 has a
trapezoid shape, and the slurry is applied on the outer surface of
the trapezoid object O1 so as to form a graphite coating 13a.
Afterwards, a pressing tool R1 with a shape fitting the surface of
the trapezoid object O1 is used to press the dried graphite coating
13a, thereby obtaining a non-planar graphene sheet combining
graphite flake structure. Accordingly, the slurry of the invention
can form a graphene sheet combining graphite flake structure with
the desired shape for fitting the heat source of different shapes
or a larger surface. Thus, it can satisfy the high heat-dissipation
requirement for the electronic device with different shapes.
[0038] FIG. 3 is a flow chart of another manufacturing method of
the graphene sheet combining graphite flake structure 1 according
to the embodiment of the invention.
[0039] Different the manufacturing method of FIG. 1, the
manufacturing method of FIG. 3 further includes a step S05, which
is to depart the graphene sheet combining graphite flake structure
1 from the object O. As shown in FIG. 2F, a knife tool is inserted
between the graphene sheet combining graphite flake structure 1 and
the object O, thereby breaking the vacuum status between the
graphene sheet combining graphite flake structure 1 and the object
O to depart the graphene sheet combining graphite flake structure 1
from the object O. Accordingly, the graphene sheet combining
graphite flake structure 1 is obtained. The thickness D of the
obtained graphene sheet combining graphite flake structure 1 is
between 2 .mu.m and 100 .mu.m.
[0040] To be noted, in some embodiments, the graphene sheet
combining graphite flake structure 1 and the object O together can
be attached to the heat source directly, and this invention is not
limited.
[0041] In this embodiment, the graphene sheet combining graphite
flake structure 1 is flexible and includes the graphite
nanoplatelet material 11 and the graphene material 12. The graphene
material 12 is mixed in the graphite nanoplatelet material 11, and
the content of the graphene material 12 is between 1% and 80% of
the graphite nanoplatelet material 11. The graphite nanoplatelet
material 11 includes a plurality of graphite nanoplatelets. The
size of the graphite nanoplatelets is between 5 .mu.m and 200
.mu.m, and the thickness of the graphite nanoplatelets is between
0.1 .mu.m and 0.5 .mu.m. In addition, the graphene material 12
includes a plurality of graphenes. The size of the graphenes is
between 1 .mu.m and 50 .mu.m, and the thickness of the graphenes is
between 0.002 .mu.m and 0.02 .mu.m. The thickness D of the graphene
sheet combining graphite flake structure 1 is between 2 .mu.m and
100 .mu.m.
[0042] As mentioned above, the graphite nanoplatelet material and
graphene material contained in the graphene sheet combining
graphite flake structure 1 have good heat conductivity, so that the
heat can be rapidly dissipated from the heat source. Besides, the
thickness D of the graphene sheet combining graphite flake
structure 1 1 is between 2 .mu.m and 100 .mu.m, so that the
graphene sheet combining graphite flake structure 1 can be used as
a heat-dissipation structure with better heat conductivity and
thinner thickness. These features are suitable for the light and
thin requirement of the current electronic products. The
conventional graphite platelet made of only the graphite
nanoplatelet has a heat conductive coefficient of about 200 W/m-K.
However, the heat conductive coefficient of the graphene sheet
combining graphite flake structure 1 containing 10% of the graphene
material 12 (graphene) is about 400 W/m-K. Therefore, when the
graphene sheet combining graphite flake structure 1 is applied to
dissipate the heat of an electronic component (e.g. CPU), the heat
can be rapidly dissipated. Moreover, it is possible to cooperate
with a heat dissipating device, which includes a heat sink and a
fan, for removing the heat transmitted from the electronic
component to the graphene sheet combining graphite flake structure
1, thereby decreasing the temperature of the electronic component.
In addition, the graphene sheet combining graphite flake structure
1 of the present invention can be applied to the heat source with
different shapes or a larger surface. Besides, the graphene
material 12 makes the graphene sheet combining graphite flake
structure 1 have high heat and electricity conductivities and
better flexibility. Thus, the entire structure intensity of the
graphene sheet combining graphite flake structure 1 is stronger.
Furthermore, the graphene sheet combining graphite flake structure
1 also has an electromagnetic shielding property. In one
embodiment, when the thickness of the graphene sheet combining
graphite flake structure 1 is 10 .mu.m, it can provide an
electromagnetic shielding effect of 37 dB-45 dB.
[0043] FIG. 4 is a schematic diagram showing the graphene sheet
combining graphite flake structure according to the embodiment of
the invention viewing from an SEM (Scanning Electron Microscopy).
Herein, the graphene sheet combining graphite flake structure is
cut into a plurality of small pieces, and then the edges of the
small pieces are observed by SEM so as to obtain the image as shown
in FIG. 4.
[0044] The graphene sheet combining graphite flake structure of
FIG. 4 has a thickness of 30 .mu.m. Besides, the content of the
graphene material 12 is about 5% of the content of the graphite
nanoplatelet material 11. As shown in FIG. 4, the graphite
nanoplatelet material 11 (graphite nanoplatelets) is the thicker
plate part, and the graphene material 12 (graphene) is the
semi-transparent feathery part.
[0045] In summary, the graphene sheet combining graphite flake
structure contains a graphite nanoplatelet material and a graphene
material mixed in the graphite nanoplatelet material. The content
of the graphene material is between 1% and 80% of the graphite
nanoplatelet material. In addition, the slurry of the invention
contains a solvent, a graphite nanoplatelet material and a graphene
material, and the graphite nanoplatelet material and the graphene
material are mixed in the solvent. The weight percentage of the
graphite nanoplatelet material is between 0.1% and 10%, and the
content of the graphene material is between 1% and 80% of the
graphite nanoplatelet material. Since the graphite nanoplatelet
material and graphene material contained in the graphene sheet
combining graphite flake structure and the slurry have good heat
conductivity, the heat can be rapidly dissipated from the heat
source. Accordingly, the graphene sheet combining graphite flake
structure of the invention has better heat conducting effect.
Besides, the graphene material allows the graphene sheet combining
graphite flake structure to have a flexible property, so that the
entire structure becomes stronger.
[0046] In addition, the graphene sheet combining graphite flake
structure of the invention can fit the heat sources with different
shapes, or it can be attached to a heat source with a large
surface. This feature can satisfy the high heat-dissipation
requirements of the electronic devices with different shapes.
Moreover, the graphene sheet combining graphite flake structure of
the invention further has an electromagnetic shielding effect.
[0047] Although the invention has been described with reference to
specific embodiments, this description is not meant to be construed
in a limiting sense. Various modifications of the disclosed
embodiments, as well as alternative embodiments, will be apparent
to persons skilled in the art. It is, therefore, contemplated that
the appended claims will cover all modifications that fall within
the true scope of the invention.
* * * * *