U.S. patent application number 15/776254 was filed with the patent office on 2020-08-13 for coating composition having excellent corrosion resistance and fingerprint resistance, stainless steel sheet having etching patte.
The applicant listed for this patent is POSCO. Invention is credited to Ha-Na CHOI, Yang-Ho CHOI, Jin-Tae KIM, Jong-Kook KIM, Jung-Hwan LEE, Yon-Kyun SONG.
Application Number | 20200255687 15/776254 |
Document ID | 20200255687 / US20200255687 |
Family ID | 1000004840290 |
Filed Date | 2020-08-13 |
Patent Application | download [pdf] |
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United States Patent
Application |
20200255687 |
Kind Code |
A1 |
KIM; Jin-Tae ; et
al. |
August 13, 2020 |
COATING COMPOSITION HAVING EXCELLENT CORROSION RESISTANCE AND
FINGERPRINT RESISTANCE, STAINLESS STEEL SHEET HAVING ETCHING
PATTERNS, AND MANUFACTURING METHOD THEREFOR
Abstract
Provided is a coating composition having excellent corrosion
resistance and fingerprint resistance, and also provides a
stainless steel sheet having etching patterns and a manufacturing
method therefor, the stainless steel sheet comprising: a stainless
steel sheet; a coating layer, which is formed on the stainless
steel sheet and is a cured product of the coating composition; and
a quenching coated film layer formed on the coating layer and
having a quenching effect, wherein: the coating layer, formed by
curing the coating composition having excellent corrosion
resistance and fingerprint resistance, is transparent and has high
gloss, thereby having an effect of enabling the surface
characteristics of the stainless steel sheet to be expressed as
they are; the stainless steel sheet having etching patterns has
excellent corrosion resistance and fingerprint resistance even on
the parts thereof on which the etching patterns are not formed.
Inventors: |
KIM; Jin-Tae; (Gwangyang-si,
KR) ; CHOI; Ha-Na; (Gwangyang-si, KR) ; CHOI;
Yang-Ho; (Gwangyang-si, KR) ; LEE; Jung-Hwan;
(Gwangyang-si, KR) ; SONG; Yon-Kyun;
(Gwangyang-si, KR) ; KIM; Jong-Kook;
(Gwangyang-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
POSCO |
Pohang-si |
|
KR |
|
|
Family ID: |
1000004840290 |
Appl. No.: |
15/776254 |
Filed: |
November 24, 2016 |
PCT Filed: |
November 24, 2016 |
PCT NO: |
PCT/KR2016/013582 |
371 Date: |
May 15, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C08K 2003/2227 20130101;
C09D 5/08 20130101; C09D 183/08 20130101; C09D 11/101 20130101;
C08K 3/22 20130101; B05D 2202/15 20130101; C08L 2201/10 20130101;
C08K 3/36 20130101; B05D 3/067 20130101; C08L 75/04 20130101; C09D
7/47 20180101; C08K 2003/222 20130101; B41M 5/0047 20130101; B05D
7/52 20130101; C08K 5/52 20130101; C08K 5/09 20130101; C09D 183/06
20130101; C08K 5/56 20130101; B05D 7/14 20130101 |
International
Class: |
C09D 183/06 20060101
C09D183/06; C09D 183/08 20060101 C09D183/08; C09D 5/08 20060101
C09D005/08; C08L 75/04 20060101 C08L075/04; B05D 3/06 20060101
B05D003/06; B05D 7/14 20060101 B05D007/14; B05D 7/00 20060101
B05D007/00; B41M 5/00 20060101 B41M005/00; C09D 11/101 20060101
C09D011/101; C09D 7/47 20060101 C09D007/47 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 2, 2015 |
KR |
10-2015-0170497 |
Claims
1. A coating composition comprising: 10 to 30 wt % of a
silane-based compound, 0.5 to 6 wt % of an organic acid, 0.1 to 3
wt % of a vanadium compound, 0.1 to 3 wt % of a magnesium compound,
and a remainder of a solvent.
2. The coating composition of claim 1, further comprising: 1 to 2
wt % of a wetting agent, and 0.01 to 1 wt % of a defoamer.
3. The coating composition of claim 1, wherein the silane-based
compound is one or more selected from the group consisting of
epoxy-based silane and amino-based silane.
4. The coating composition of claim 1, wherein the organic acid is
one or more selected from the group consisting of formic acid,
acetic acid and phosphoric acid.
5. A stainless steel sheet having etching patterns, comprising: a
stainless steel sheet; a coating layer, formed on the stainless
steel sheet, and comprising a cured product of the coating
composition of claim 1; and a quenching coated film layer, formed
on the coating layer and having a quenching effect.
6. The stainless steel sheet of claim 5, wherein the coating layer
has a thickness of 0.1 to 10 .mu.m.
7. The stainless steel sheet of claim 5, wherein the coating layer
has a gloss of 80 or more at 60.degree..
8. The stainless steel sheet of claim 5, wherein the quenching
coated film layer includes a quencher.
9. The stainless steel sheet of claim 8, wherein the quencher is
one or more selected from the group consisting of silica, alumina,
wax, ceramic and synthetic polymer powder.
10. The stainless steel sheet of claim 5, wherein the quenching
coated film layer includes a plurality of bubbles.
11. The stainless steel sheet of claim 10, wherein the bubbles have
an average diameter of 0.5 to 3 .mu.m.
12. The stainless steel sheet of claim 5, wherein the quenching
coated film layer has a thickness of 1 to 20 .mu.m.
13. The stainless steel sheet of claim 5, wherein the quenching
coated film layer has a gloss of 3 to 50 at 60.degree..
14. A manufacturing method of a stainless steel sheet having
etching patterns, comprising: coating the coating composition of
claim 1 on a stainless steel sheet to form a coating layer; and
forming a quenching coated film layer, having an etching effect, on
the coating layer.
15. The method of claim 14, wherein the quenching coated film layer
is formed by a method of coating a coating material including a
quencher on the coating layer, and then curing the coating
material.
16. The method of claim 14, wherein the quenching coated film layer
is formed by a method including: ejecting a transparent ink onto
the coating layer; and performing UV curing within 2 seconds of
ejecting the transparent ink.
17. The method of claim 14, wherein the ejecting is performed by an
ink jet printer or a laser printer.
18. The method of claim 14, wherein the ejecting speed of the
transparent ink in the ejecting is 1 to 20 kHz.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to a coating composition
having excellent corrosion resistance and fingerprint resistance, a
stainless steel sheet having etching patterns, and a manufacturing
method therefor.
BACKGROUND ART
[0002] Usually, a printed steel sheet is manufactured as a printed
steel sheet having a design formed thereon, using a roll printing
or a silk screen process; however, a stainless steel sheet is
manufactured as a stainless steel sheet having a design formed
thereon by etching the design with an acid or performing direct
engraving.
[0003] However, in the case of etching with an acid or engraving a
stainless steel sheet, it may be difficult to apply various
patterns or designs, and the resolution of patterns, designs and
the like is low. In particular, in the case of forming patterns by
the method of etching a stainless steel sheet with an acid, pattern
printing is performed on the stainless steel sheet with a polymer
resin, and then the part of the steel sheet with no pattern print
is dissolved with the acid by acid etching to form etching patterns
in stainless steel materials, and the polymer pattern printed part
is redissolved to reveal the material. Therefore, since a product
is produced through the following steps: polymer pattern
printing-drying-acid etching-washing-polymer pattern
removing-washing, the process is complicated, and the operation
costs may be high.
[0004] Accordingly, in order to prevent such problems, a method of
forming a coated film layer having adjustable gloss on a stainless
steel sheet to form patterns is used. By adjusting the gloss so
that the coated film layer has a quenching effect, an etching
effect, identical to that obtained when forming patterns with a
method of acid-etching or engraving a stainless steel sheet, may be
exhibited. As the method of allowing the coated film layer to have
a quenching effect, for example, a coating material including
silica, a quencher, may be coated on a stainless steel sheet to
form patterns, thereby manufacturing a stainless steel sheet having
a coated film layer having an etching effect formed thereon.
[0005] However, this method has a problem in that corrosion may
occur on the portion of the stainless steel sheet on which the
coated film layer is not formed, and also, the stainless steel
sheet may be easily contaminated with fingerprints or pollutants,
which may not be easily removed therefrom, and thus, it may be
difficult to maintain the value as a product and secure product
quality. Moreover, when forming the coated film layer having a
quenching effect by the ink jet, roll print or silk screen
printing, adhesive strength between the stainless steel sheet and
the coated film layer is poor, so that the coated film layer may be
easily peeled off.
DISCLOSURE
Technical Problem
[0006] An aspect of the present disclosure is to provide a coating
composition having corrosion resistance and fingerprint resistance,
a stainless steel sheet having excellent corrosion resistance and
fingerprint resistance even on the portion on which a quenching
coated film layer having a quenching effect is not formed, and a
manufacturing method therefor.
Technical Solution
[0007] According to an aspect of the present disclosure, a coating
composition including: 10 to 30 wt % of a silane-based compound,
0.5 to 6 wt % of an organic acid, 0.1 to 3 wt % of a vanadium
compound, 0.1 to 3 wt % of a magnesium compound, and a remainder of
a solvent is provided.
[0008] The coating composition may further include 1 to 2 wt % of a
wetting agent, and 0.01 to 1 wt % of a defoamer.
[0009] The silane-based compound may be one or more selected from
the group consisting of epoxy-based silane and amino-based
silane.
[0010] The organic acid may be one or more selected from the group
consisting of formic acid, acetic acid and phosphoric acid.
[0011] According to another aspect of the present disclosure, a
stainless steel sheet having etching patterns including: a
stainless steel sheet, a coating layer, formed on the stainless
steel sheet and comprising a cured product of the coating
composition, and a quenching coated film layer, formed on the
coating layer and having a quenching effect is provided.
[0012] The coating layer may have a thickness of 0.1 to 10
.mu.m.
[0013] The coating layer may have a gloss of 80 or more at
60.degree..
[0014] The coated film layer may include a quencher.
[0015] The quencher may be one or more selected from the group
consisting of silica, alumina, wax, ceramic and synthetic polymer
powder.
[0016] The coated film layer may include a plurality of
bubbles.
[0017] The bubbles may have an average diameter of 0.5 to 3
.mu.m.
[0018] The coated film layer may have a thickness of 1 to 20
.mu.m.
[0019] The coated film layer may have a gloss of 3 to 50 at
60.degree..
[0020] According to another aspect of the present disclosure, a
manufacturing method of a stainless steel sheet having etching
patterns, including: coating the coating composition on a stainless
steel sheet to forma coating layer, and forming a coated film
layer, having an etching effect, on the coating layer is
provided.
[0021] The coated film layer may be formed by coating a coating
material including a quencher on the coating layer, and then curing
the coating material.
[0022] The coated film layer may be formed by a method including
ejecting a transparent ink onto the coating layer, and performing
UV curing within two seconds, immediately after ejecting the
transparent ink.
[0023] The ejecting may be performed by an inkjet printer or a
laser printer.
[0024] The ejecting speed of the transparent ink in the ejecting
may be 1 to 20 kHz.
Advantageous Effects
[0025] As set forth above, according to an exemplary embodiment in
the present disclosure, the coating composition of the present
disclosure has excellent corrosion resistance and fingerprint
resistance, and the coating layer obtained by curing the coating
composition is transparent and has high gloss, thereby expressing
the surface characteristics of the stainless steel sheet as they
are.
[0026] In addition, the stainless steel sheet having etching
patterns of the present disclosure has excellent corrosion
resistance and fingerprint resistance even on the portion on which
the etching patterns are not formed, and the manufacturing method
of the stainless steel sheet has a simple and cost-saving process
as compared with the conventional etching pattern forming method,
and thus, is economical.
DESCRIPTION OF DRAWINGS
[0027] FIG. 1 is a drawing schematically representing a section of
Example 4.
[0028] FIG. 2 is a drawing schematically representing a section of
Comparative Example 6.
[0029] FIG. 3 is a drawing schematically representing a section of
Comparative Example 7.
BEST MODE FOR INVENTION
[0030] Hereinafter, preferable embodiments of the present
disclosure will be described with reference to the accompanying
drawings. However, the embodiments of the present disclosure may be
modified to have many different forms and the scope of the
disclosure is not limited to the embodiments set forth herein.
[0031] The present disclosure relates to a coating composition
having excellent corrosion resistance and fingerprint resistance, a
stainless steel sheet having etching patterns, and a manufacturing
method therefor.
[0032] The coating composition of the present disclosure may
include 10 to 30 wt % of a silane-based compound, 0.5 to 6 wt % of
an organic acid, 0.1 to 3 wt % of a vanadium compound, 0.1 to 3 wt
% of a magnesium compound, and a remainder of a solvent.
[0033] Meanwhile, the coating composition may further include 1 to
2 wt % of a wetting agent, and 0.01 to 1 wt % of a defoamer.
[0034] The coating composition includes the vitreous silane-based
compound, thereby expressing the surface characteristics of a
parent material coated with the coating composition as they are.
That is, since the coating composition is a transparent and high
gloss solution, it may express the high gloss of the stainless
steel sheet as it is. The silane-based compound may be preferably
for example, one or more selected from the group consisting of
silane-based epoxy-based silane and amino-based silane, but not
limited thereto. The epoxy-based silane may be one or more selected
from the group consisting of 3-glycidoxypropyltrimethoxysilane,
3-glycidoxypropylmethyldiepoxysilane and
3-glycidoxypropyltriethoxysilane. Meanwhile, the amino-based silane
may be one or more selected from the group consisting of
3-aminopropyltriethoxysilane, bis-tert-butylaminosilane,
diisopropylaminosilane disilylamine and trisilylamine.
It is preferable that the content of the silane-based compound is
10 to 30 wt %, and when the content of the silane-based compound is
less than 10 wt %, corrosion resistance and adhesiveness are
deteriorated, and when the content is more than 30 wt %, solution
stability is lowered, and thus, not preferable.
[0035] The organic acid included in the coating composition of the
present disclosure is a material required to improve adhesiveness
between the stainless steel sheet and the coating layer, and the
type is not particularly limited; however, for example, one or more
selected from the group consisting of formic acid, acetic acid and
phosphoric acid are preferable. It is preferable that the content
of the organic acid is 0.5 to 6 wt %, and when the content of the
organic acid is less than 0.5 wt %, adhesiveness between the
stainless steel sheet and the coating layer is lowered so that the
coating layer may be released, and when the content is more than 6
wt %, stability of the solution and the physical properties of the
coated film are deteriorated.
[0036] The vanadium compound and the magnesium compound form a
stable metal chelate compound by inducing a chelate reaction, which
leads higher binding strength between metal atoms of the steel
sheet and the coating layer, thereby having excellent corrosion
resistance and adhesiveness of the coated layer.
[0037] The vanadium compound may be one or more selected from the
group consisting of vanadyl acetylacetonate, vanadium(V) oxide,
metavanadic acid, ammonium metavanadate, sodium metavanadate,
vanadium oxytrichloride, vanadium(III) oxide, vanadium dioxide,
vanadium oxysulfate, vanadium oxyacetylacetate, vanadium
acetylacetate and vanadium(III) chloride. It is preferable that the
content of the vanadium compound is 0.1 to 3 wt %, and when the
content of the vanadium compound is less than 0.1 wt %, the metal
chelate compound is difficult to be formed, and when the content is
more than 3 wt %, unreacted metal compounds remain to deteriorate
the physical properties of the solution.
[0038] The magnesium compound may be one or more selected from the
group consisting of magnesium oxide, magnesium sulfate, magnesium
chloride and magnesium hydroxide. It is preferable that the content
of the magnesium compound is 0.1 to 3 wt %, and when the content of
the magnesium compound is less than 0.1 wt %, the metal chelate
compound is difficult to be formed, and when the content is more
than 3 wt %, unreacted metal compounds remain so that the physical
properties of the solution is deteriorated.
[0039] The wetting agent may be one or more selected from the group
consisting of isopropyl alcohol, 2-ethyl-1-hexanol,
2-buthoxyethanol, dipropyleneglycol, ethylene glycol, n-propyl
alcohol, propylene glycol and polysiloxane copolymer series. It is
preferable that the content of the wetting agent is 1 to 2 wt %,
and when the content of the wetting agent is less than 1 wt %, a
wettability improvement effect is deteriorated, and adhesive
strength of the coating layer is lowered, and when the content is
more than 2 wt %, the physical properties are not lowered, but
there is also no wettability improvement effect, which is not
economically preferable.
[0040] The bubbles produced in the coating composition, causing
surface defects such as cratering or weakened strength of the
coating layer, may occur in several steps in the process, and thus,
it is preferable to use a defoamer. As the defoamer,
N-methylethanolamine may be used, and the content of the defoamer
is preferably 0.01 to 1 wt %. When the content of the defoamer is
less than 0.01 wt %, the defoaming effect may be poor, and when the
content is more than 1 wt %, corrosion resistance may be lowered
and the adhesive strength of the coating layer may be
decreased.
[0041] FIG. 1 is a drawing schematically representing the section
of the stainless steel sheet having etching patterns which is an
exemplary embodiment of the present disclosure, and hereinafter,
the stainless steel sheet having etching patterns will be described
in detail.
[0042] An exemplary embodiment of the present disclosure may
provide a stainless steel sheet having etching patterns including:
a stainless steel sheet 1, a coating layer 2, formed on the
stainless steel sheet and comprising a cured product of the coating
composition, and a quenched film layer 3, formed on the coating
layer and having a quenching effect.
[0043] Usually, as the method of forming etching patterns on the
stainless steel sheet 1, there are methods of acid etching,
engraving, and the like, however, these methods are difficult to
use to apply various patterns or designs, the resolution of the
patterns and designs is low, and the process is complicated.
Accordingly, a method of forming a coated film layer having a
quenching effect on a stainless steel sheet to form patterns is
used.
[0044] Meanwhile, the coated film layer having a quenching effect
is formed on the stainless steel sheet and represents an etching
effect like forming patterns by an acid etching method on the
stainless steel sheet, and in the present disclosure, the coated
film layer having a quenching effect is set as a `quenching coated
film layer 3.`
[0045] The quenching coated film layer 3 is formed on the stainless
steel sheet 1 and may represent an etching effect like forming
etching patterns, and in addition, the stainless steel sheet having
the quenching coated film layer formed thereon may have excellent
physical properties such as corrosion resistance and fingerprint
resistance. However, there is a problem in that corrosion
resistance, fingerprint resistance and fouling resistance are
deteriorated on the portion of the stainless steel sheet on which
the quenching coated film layer is not formed. Moreover, when
forming the quenching coated film layer by the method of ink jet,
roll print or silk screen printing, adhesive strength between the
stainless steel sheet and the quenching coated film layer is poor,
so that the quenching coated film layer is easily peeled off.
[0046] However, the present disclosure forms the coating layer 2 on
the stainless steel sheet 1 and the quenching coated film layer 3,
thereby improving corrosion resistance, fingerprint resistance and
fouling resistance on the portion of the stainless steel sheet on
which the quenching coated film layer is not formed, and improving
adhesive strength between the stainless steel sheet and the
quenching coated film layer.
[0047] The coating layer 2 is obtained by curing the coating
composition of the present disclosure, and may include a
silane-based compound, an organic acid, a vanadium compound, a
magnesium compound and a defoamer. Meanwhile, since the coating
layer including the silane-based compound is transparent and has
high gloss, it may represent the surface characteristics of the
stainless steel sheet as they are.
[0048] The coating layer 2 has a thickness of preferably 0.1 to 10
.mu.m, and most preferably 0.5 to 5 .mu.m. When the thickness of
the coating layer is less than 0.1 .mu.m, corrosion resistance is
poor, and when the thickness is greater than 10 .mu.m,
processability is poor, and manufacturing costs also increase. In
addition, it is preferable that the coating layer 2 have a gloss of
80 or more at 60.degree.. When the gloss of the coating layer is
less than 80, the coating layer may not express the surface
characteristics of the stainless steel sheet 1 as they are.
Therefore, since the high gloss of the stainless steel sheet may
not be expressed as it is, the part on which the quenching coated
film layer 3 is formed, and the part on which the quenching coated
film layer is not formed are not clear, thereby decreasing the
etching effect.
[0049] Since the quenching coated film layer 3 formed on the
coating layer 2 has the quenching effect, etching patterns may be
formed on the stainless steel sheet 1. It is preferable to include
a quencher in order that the quenching coated film layer has the
quenching effect. The quencher may be one or more selected from the
group consisting of silica, alumina, wax, ceramic and a synthetic
polymer powder. Meanwhile, it is preferable that the quencher have
an average particle diameter of 1 to 30 .mu.m, and when the average
particle diameter of the quencher is more than 30 .mu.m, the
surface of the quenching coated film layer is rough, so that the
appearance is poor and anti-scratch properties are lowered.
[0050] In order to impart the quenching effect to the quenching
coated film layer 3, the present disclosure may provide a quenching
coated film layer including a plurality of bubbles, in addition to
providing the quenching coated film layer including the quencher,
as described above. The quenching coated film layer including a
plurality of bubbles may be manufactured by a method of ejecting a
transparent ink onto the coating layer by a printing technique to
produce micro-sized bubbles, and then UV-curing the transparent
ink.
[0051] The quenching coated film layer 3 including a plurality of
bubbles may represent the quenching effect by producing diffused
reflection of light in the bubbles. Thus, the part (pattern) of the
coating layer 2 formed on the stainless steel sheet 1 on which the
quenching coated film layer is formed may represent the quenching
effect. Therefore, the quenching coated film layer including a
plurality of bubbles may be formed on the coating layer, thereby
representing an etching effect like direct etching or engraving on
the stainless steel sheet. It is preferable that the bubbles have
an average diameter of 0.5 to 3 .mu.m, and when the average
diameter is less than 0.5 .mu.m, the size of the bubbles may be
unduly small, so that the effect of diffused reflection of light is
deteriorated, and when the average diameter is more than 3 .mu.m,
the effect of diffused reflection of light is excellent, but the
air layer of bubbles are unduly increased to weaken the physical
properties of the quenching coated film layer.
[0052] It is preferable that the quenching coated film layer 3 have
a thickness of 1 to 20 .mu.m, and when the thickness is lower than
1 .mu.m, the quenching effect is deteriorated to have no effect as
an etching steel sheet, and when the thickness is greater than 20
.mu.m, the quenching effect is excellent due to the bubbles of the
printed coated film, but the coated film may be peeled off.
[0053] Meanwhile, it is preferable that the quenching coated film
layer 3 have a surface gloss of 3 to 30 at 60.degree.. When the
surface gloss is less than 3, the etching effect is excellent, but
the number of bubbles should be very large, and thus, the physical
properties of the printed coated film may be relatively weakened,
and when the surface gloss is more than 50, the etching effect is
not shown on the quenching coated film layer.
[0054] According to another exemplary embodiment of the present
disclosure, a manufacturing method of a stainless steel sheet
having etching patterns, including: coating the coating composition
on a stainless steel sheet 1 to form a coating layer 2, and forming
a quenching coated film layer 3 having an etching effect on the
coating layer may be provided.
[0055] Before forming the coating layer 2 on the stainless steel
sheet 1, pollutants on the surface of the stainless steel sheet may
be removed. As a method of removing the pollutants, for example, an
acetone degreasing or alkaline degreasing solution is used to
remove organic and inorganic pollutants attached to the surface of
the stainless steel sheet. When using the acetone degreasing
solution, the stainless steel sheet is immersed in an acetone
solution, or the surface of stainless steel is cleaned with gauze
soaked in acetone. Meanwhile, when using the alkaline degreasing
solution, the stainless steel sheet is immersed in a decreasing
solution including an alkali, is washed with water and dried. Here,
as the concentration of alkali and the immersion time, a usually
used condition may be utilized, but it is preferable to perform
immersion until the pollutants on the surface of the stainless
steel sheet are completely removed.
[0056] The coating composition may be coated on the stainless steel
sheet 1 from which pollutants are removed to form the coating layer
2. The coating composition is transparent and has high gloss, so
that it may express the surface characteristics of the stainless
steel sheet as they are, and thus, etching patterns may be formed
on the stainless steel sheet while maintaining high gloss of the
stainless steel sheet as it is. In addition, by forming the coating
layer on the stainless steel sheet, the stainless steel sheet
having etching patterns of the present disclosure has an effect of
excellent corrosion resistance and fingerprint resistance.
[0057] The method of coating the coating composition may be one
selected from the methods, for example, roll coating, spray
coating, slot coating, impregnation coating, curtain coating and
the like, but is not limited thereto. It is preferable that the
thickness of the coating layer 2 be controlled to 0.1 to 10 .mu.m.
When the thickness of the coating layer is less than 0.1 .mu.m,
corrosion resistance is poor, and when the thickness is greater
than 10 .mu.m, processability is poor, and also manufacturing costs
increase.
[0058] On the coating layer 2, the quenching coated film layer 3
having an etching effect may be formed. The quenching coated film
layer may be formed by coating a coating material including a
quencher on the coating layer, and then curing the coating
material. The quencher may be one or more selected from the group
consisting of silica, alumina, wax, ceramic and synthetic polymer
powder. Meanwhile, it is preferable that the quencher have an
average particle diameter of 1 to 30 .mu.m, and when the average
particle diameter of the quencher is more than 30 .mu.m, the
surface of the quenching coated film layer is rough, so that the
appearance is poor and anti-scratch properties are lowered.
[0059] However, the method of imparting the quenching effect of the
quenching coated film layer 3 using the quencher has a problem in
that when adding a large amount of quencher to the coating material
for adjusting the quenching effect by adjusting the content of the
quencher, the hardness of the quenching coated film layer is
increased, and processability is weakened. In addition, it is
difficult to solve the problem of decreased resolution, and even in
the case of applying the quencher to a printing process in order to
increase the resolution, the several micro-sized quencher blocks an
ink injection nozzle.
[0060] Therefore, the present disclosure provides a method of
forming a quenching coated film layer which solves the problem in
the method of forming the quenching coated film layer 3 using the
quencher. That is, a method of forming a quenching coated film
layer including ejecting a transparent ink onto the coating layer
2, and performing UV curing within two seconds of ejecting the
transparent ink may be provided.
[0061] The present disclosure may express etching patterns having a
quenching effect, by ejecting a transparent ink onto the coating
layer 2 by a printing technique to produce micro-sized bubbles,
which are UV-cured immediately thereafter. That is, when diffused
reflection of light occurs in the bubbles, the quenching coated
film layer including the bubbles has a quenching effect, and thus,
the stainless steel sheet having a quenching coated film layer
formed by a printing technique may include patterns having an
etching effect without proceeding with an etching process.
[0062] In order to maintain the bubbles, it is preferable to cure a
transparent ink in a short time within two seconds of ejecting the
transparent ink on the coating layer 2 by a printing technique. In
the case that more than two seconds have passed from ejecting the
transparent ink to the start of curing, the bubbles formed on the
coating layer disappear so that the diffused reflection of light
does not occur, thereby deteriorating the quenching effect of the
quenching coated film layer 3. Therefore, the etching effect of the
etching patterns formed on the stainless steel sheet of the present
disclosure may be deteriorated.
[0063] Meanwhile, in order to cure the quenching coated film layer
in a short time for maintaining the bubbles included in the
quenching coated film layer 3, it is preferable to use a UV curing
method, and in order to use the UV curing method, it is preferable
to include a photoinitiator in the coating material forming the
quenching coated film layer.
[0064] The transparent ink may be a mixture of one or more resin
components selected from the group consisting of polymer-based,
epoxy-based, urethane-based and ester-based acrylate oligomers such
as polyester, modified polyester and high-polymer polyester, but
not limited thereto.
[0065] The ejection of the transparent ink may be usually performed
using any equipment capable of ejecting ink without limitation, and
for example, may be performed by an ink jet printer or a laser
printer. In addition, it is preferable that the ejection speed of
the transparent ink is 1 to 20 kHz, and when the ejection speed is
less than 1 kHz, the bubbles are not sufficiently produced, so that
the quenching effect is not represented in the quenching coated
film layer 3, and when the ejection speed is more than 20 kHz, an
excessive amount is ejected, so that desired patterns may not be
expressed.
[0066] It is preferable to control the thickness of the quenching
coated film layer 3 to 1 to 20 .mu.m, and when the thickness is
lower than 1 .mu.m, the quenching effect is deteriorated to have no
effect as a stainless steel sheet having etching patterns, and when
the thickness is greater than 20 .mu.m, the quenching effect is
excellent due to the bubbles, but the coated film may be peeled
off.
Mode for Invention
[0067] Hereinafter, the present disclosure will be described in
detail through the specific examples. The following example is only
illustrative for assisting in the understanding of the present
disclosure, and the scope of the present disclosure is not limited
thereto.
EXAMPLE
[0068] 1. Preparation of Coating Composition
[0069] A silane-based compound, an organic acid, a vanadium
compound and a magnesium compound were added to a solvent, and then
stirred to prepare a coating composition, and as the solvent, a
mixture of water and ethanol was used. As the silane-based
compound, 3-glycidoxypropyl trimethoxysilane and 3-aminopropyl
triethoxysilane were used, and the mixing ratio thereof was
controlled to 1:1. In addition, formic acid and phosphoric acid
were used as the organic acid, vanadyl acetylacetonate was used as
the vanadium compound, and magnesium oxide was used as the
magnesium compound.
[0070] The composition and each content included in the coating
composition were adjusted as described in the following Table 1 to
prepare the coating compositions of Examples 1 to 3, and
Comparative Examples 1 to 5.
TABLE-US-00001 TABLE 1 Comparative Comparative Comparative
Comparative Comparative (Unit: wt %) Example 1 Example 2 Example 3
Example 1 Example 2 Example 3 Example 4 Example 5 Silane compound
30 20 10 12 6 30 10 5 Formic acid 3 1 0.5 3 3 -- -- -- Phosphoric
acid 3 1 0.5 3 3 -- -- -- Vanadyl 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
acetylacetonate Magnesium oxide 2 2 2 2 2 2 2 2 Urethane resin --
-- -- 8 24 -- 20 25 Solvent 61.5 75.5 86.5 71.5 61.5 67.5 67.5
67.5
[0071] 2. Preparation of Stainless Steel Sheet Having Etching
Patterns Printed Thereon
[0072] On a stainless steel sheet 1 having a width of 20 cm.times.a
length of 20 cm, the coating compositions of Examples 1 to 3 and
Comparative Example 1 to 5 were coated to a thickness of 5 .mu.m to
form a coating layer 2. On the coating layer, a transparent UV
curable ink, not including a pigment, was ejected by an ink jet
printer to print patterns. The ejection speed of the transparent UV
curable ink was 12 khz, and within one second of ejecting the
transparent UV curable ink, UV curing was performed to form the
quenching coated film layer 3. This process of performing UV curing
immediately after ejecting was performed through a continuous
process.
Experimental Example 1: Test of Physical Properties Depending on
Content of Composition Included in Coating Composition
[0073] The solution stability of the coating compositions of
Examples 1 to 3, and Comparative Examples 1 to 5 was tested. In
addition, the corrosion resistance, the coating layer adhesiveness,
the quenching coated film layer adhesiveness, the gloss, and the
scratch resistance of the stainless steel sheets having the cured
product (coating layer 2)) formed thereon of Examples 1 to 3 and
Comparative Examples 1 to 5 as manufactured in the above 2 were
tested and the results are shown in Table 2.
[0074] <Solution Stability>
[0075] The coating composition of Examples 1 to 3 and Comparative
Examples 1 to 5 were stored for 1 month in a constant temperature
apparatus at 40.degree. C., and then the viscosity increase,
gelling and precipitation of the composition were observed and
evaluated according to the following criteria.
[0076] .smallcircle. increased viscosity of solution, no change in
gelling and precipitation.
[0077] X increased viscosity of solution, change in gelling and
precipitation.
[0078] <Coating Layer Adhesiveness>
[0079] The coating layer adhesive strength is the measured adhesive
strength between the stainless steel sheet 1 and the coating layer
2. According to the adhesive strength test method of the coating
material of ISO 2409, a line was drawn at 1 mm intervals
horizontally and vertically on a specimen, adhesive cellophane tape
was attached thereto and then detached, and the adhesive strength
was evaluated by the number of remaining pieces among 100 pieces of
separated coating surface on the coated film.
[0080] .smallcircle. the number of remaining pieces being 100
[0081] .quadrature. the number of remaining pieces being equal to
or more than 80 and less than 100
[0082] X the number of remaining pieces being less than 80
[0083] <Quenching Coated Film Layer Adhesiveness>
[0084] The quenching coated film layer adhesiveness is the measured
adhesive strength between the quenching coated film layer 3 and the
coating layer 2. According to the adhesive strength test method of
the coating material of ISO 2409, a line was drawn at 1 mm
intervals horizontally and vertically on a specimen, adhesive
cellophane tape was attached thereon and then detached, and the
adhesive strength was evaluated by the number of remaining pieces
among 100 pieces of separated coating surface on the coated
film.
[0085] .smallcircle. the number of remaining pieces being 100
[0086] .quadrature. the number of remaining pieces being equal to
or more than 80 and less than 100
[0087] X the number of remaining pieces being less than 80
[0088] <Corrosion Resistance>
[0089] On the stainless steel sheets having etching patterns of
Examples 1 to 3 and Comparative Examples 1 to 5, 5% brine was
continuously sprayed for 72 hours at a humidity of 35, 95%, thereby
determining the corrosion resistance based on the initial corrosion
control area.
[0090] .smallcircle. corrosion control area being less than 5%
[0091] .quadrature. corrosion control area being equal to or more
than 5% and less than 20%
[0092] X corrosion control area being equal to or more than 50%
[0093] <Gloss>
[0094] The gloss of the stainless steel sheet having etching
patterns of Examples 1 to 3 and Comparative Examples 1 to 5 was
measured by a BYK glossmeter to evaluate the gloss (at
60.degree.).
[0095] <Scratch Resistance>
[0096] On the surface of the stainless steel sheets having etching
patterns of Examples 1 to 3 and Comparative Examples 1 to 5,
reciprocating actions were undertaken in the same direction as and
in the direction perpendicular to the painting direction 20 times,
respectively, with fingernails, and then scratch marks remaining
the coated film were observed. The observation results were
evaluated according to the following method.
[0097] .smallcircle. Marks did not appear.
[0098] .quadrature. Marks were slightly shown.
[0099] X Clear marks appeared.
TABLE-US-00002 TABLE 2 Comparative Comparative Comparative
Comparative Comparative Example 1 Example 2 Example 3 Example 1
Example 2 Example 3 Example 4 Example 5 Solution stability
.largecircle. .largecircle. .largecircle. X X .largecircle.
.largecircle. .largecircle. Coating layer .largecircle.
.largecircle. .largecircle. .largecircle. .largecircle. .DELTA. X X
adhesiveness Quenching coated .largecircle. .largecircle.
.largecircle. .largecircle. .largecircle. .largecircle.
.largecircle. .largecircle. film layer adhesiveness Corrosion
.largecircle. .largecircle. .largecircle. .largecircle.
.largecircle. .DELTA. .DELTA. .DELTA. resistance Gloss 95 93 80 69
35 95 45 30 Scratch resistance .largecircle. .largecircle.
.largecircle. .largecircle. .DELTA. .largecircle. .DELTA.
.DELTA.
[0100] As shown in the above Table 2, Examples 1 to 3 had overall
excellent physical properties. Meanwhile, in Comparative Examples 1
and 2, precipitation occurred, so that solution stability was poor,
and the gloss was lowered due to the urethane resin. In addition,
in Comparative Examples 3 to 5, coating layer adhesiveness and
corrosion resistance were deteriorated, and in Comparative Examples
4 and 5, the gloss was measured to be low. Meanwhile, Comparative
Examples 3 to 5 were the compositions not including a phosphoric
acid compound or an organic acid, and it was confirmed that in
order to improve the adhesiveness between the stainless steel sheet
1 and the coating layer 2 to have excellent coating layer
adhesiveness and corrosion resistance, it is important to add the
phosphoric acid or organic acid.
Experimental Example 2: Physical Properties Test According to Order
in which Coating Layer and Quenching Coated Film Layer are
Formed
Example 4
[0101] A stainless steel sheet 1 was cleaned using an acetone
degreasing solution, and on the cleaned stainless steel sheet, the
coating composition of Example 1 was coated, and then dried at the
temperature of 160.degree. C., thereby forming a coating layer 2
having a thickness of 5 .mu.m. On the coating layer, a transparent
UV curable ink, not including a pigment, was ejected by an ink jet
printer to print patterns. The ejection speed of the transparent UV
curable ink was 12 khz, and within one second of ejecting the
transparent ink, UV curing was performed. The quenching coated film
layer 3 formed by curing the ink had a thickness of 10 .mu.m, and
this process of UV curing immediately after ejecting was performed
by a continuous process. FIG. 1 corresponds to a drawing
schematically representing a section of Example 4.
Comparative Example 6
[0102] The quenching coated film layer and the coating layer were
formed, respectively, in the same manner as in the method of
forming the quenching coated film layer and the coating layer of
Example 4, except that the quenching coated film layer 3 is formed
on the stainless steel sheet 1, and then the coating layer 2 is
formed. FIG. 2 corresponds to a drawing schematically representing
a section of Comparative Example 6.
Comparative Example 7
[0103] A stainless steel sheet 1 was washed using an acetone
degreasing solution, and then etching patterns were formed on the
surface of the stainless steel sheet by the acid etching method.
Thereafter, a coating layer was formed in the same manner as in the
method of forming the coating layer 2 of Example 4. FIG. 3
corresponds to a drawing schematically representing a section of
Comparative Example 7.
Comparative Example 8
[0104] A stainless steel sheet 1 was washed using an acetone
degreasing solution, and a quenching coated film layer was formed
in the same manner as in the method of forming the quenching coated
film layer 3 of Example 4, thereby implementing the etching effect,
however, the coating layer was not formed.
Comparative Example 9
[0105] The surface of the stainless steel sheet 1 was etched by the
acid etching method, but the coating layer was not further
formed.
[0106] The corrosion resistance, fingerprint resistance, fouling
resistance, coating layer adhesiveness, quenching coated film layer
adhesiveness and surface texture of Example 4 and Comparative
Examples 6 to 8 were tested, and the results are shown in the
following Table 3.
[0107] <Fingerprint Resistance>
[0108] On the surface of Examples 4 and Comparative Examples 6 to
9, a fingerprint was put and the fingerprint degree was observed
with the naked eye at an angle of 20.degree., and evaluated by the
following method.
[0109] .smallcircle. Not clearly seen
[0110] .quadrature. Seen a little
[0111] X Clearly seen
[0112] <Fouling Resistance>
[0113] On the surface of Example 4 and Comparative Examples 6 to 9,
a fingerprint was made. Thereafter, the surface was wiped off with
a soft cloth, and the number of wipes until the fingerprint was
completely wiped off were counted and evaluated as follows.
[0114] .smallcircle. Wiped off with 5 or less wipes
[0115] .DELTA. Wiped off with 10 or less wipes
[0116] X 10 or more wipes required
[0117] <Surface Texture>
[0118] The surface texture of Example 4 and Comparative Examples 6
to 9 was evaluated, by evaluating texture felt when touching the
surface with hands, and a three-dimensional effect seen with the
naked eye.
[0119] .smallcircle. Tactually and visually felt surface
texture
[0120] X No surface texture
TABLE-US-00003 TABLE 3 Compar- Compar- Compar- Compar- ative ative
ative ative Classifi- Example Example Example Example Example
cation 4 6 7 8 9 Corrosion .largecircle. .largecircle.
.largecircle. X X resistance Fingerprint .largecircle. .DELTA.
.DELTA. X X resistance Fouling .largecircle. .largecircle.
.largecircle. X X resistance Coating .largecircle. .largecircle.
.largecircle. -- -- layer adhesiveness Quenching .largecircle. X --
.largecircle. -- coated film layer adhesiveness Surface
.largecircle. X X .largecircle. .largecircle. texture
[0121] As shown in the above Table 3, in Example 4, the adhesive
strength between the stainless steel sheet 1 and the coating layer
2 was excellent so that there was no peeling, which leads excellent
corrosion resistance. In addition, since the coating layer was
formed also on the portion of the stainless steel sheet other than
the region on which the quenching coated film layer 3 was formed,
the results of good fingerprint resistance and fouling resistance
were shown. In addition, a three-dimensional effect was tactually
and visually felt from the surface texture.
[0122] In Comparative Examples 6 and 7, since the coating layer
adhesiveness was excellent, corrosion resistance and fouling
resistance were excellent. However, since the adhesive strength
between the quenching coated film layer 3 and the stainless steel
sheet 1 was low, in Comparative Example 6, the quenching coated
film layer was partially peeled off. Meanwhile, in Comparative
Example 7, since the quenching coated film layer was not formed, it
is difficult to compare the adhesive strength of the quenching
coated film layer. Comparative Examples 6 and 7 had a structure in
which the coating layer 2 is formed on the quenching coated film
layer, but the texture and the three-dimensional effect of the
surface were insufficiently felt.
[0123] In Comparative Examples 8 and 9, since the coating layer 2
was not formed, the results of overall poor physical properties
such as corrosion resistance, fingerprint resistance and fouling
resistance were shown.
[0124] Hereinabove, the exemplary embodiments of the present
disclosure were described in detail; however, the scope of rights
of the present disclosure are not limited thereto, and it will be
apparent to a person skilled in the art that various modifications
and changes are possible within the scope not departing from the
technical idea of the present invention.
* * * * *