Silk screen printing ink and glass cover plate silk screen printing method

Abstract

In order to overcome the problems of complicated operation and insufficient wear resistance of existing glass cover plate screen printing ink and anti-fingerprint coating, the present invention provides a screen printing ink, comprising the following weight components: 25-47 parts of prepolymer, 16-35 parts of monomer, 0.1-2 parts of pigment, 3-7 parts of photoinitiator, 1-5 parts of compound shown in structural formula 1 and 2-7 parts of compound shown in structural formula 2; the monomer comprises the following weight components: 10-15 parts of first monomer and 6-20 parts of second monomer; the first monomer is selected from perfluorohexyl propylene oxide; wherein the prepolymer comprises 10-35 parts of epoxy acrylate and 15-27 parts of aliphatic polyurethane acrylate. The screen printing ink provided by the present invention has excellent anti-fouling and oil resistance and wear resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of new materials, and in particular relates to a silk-screen printing ink and a glass cover plate silk-screen printing method. Background Art

[0002] Glass cover plates are often provided in existing smart electronic products to protect their internal electronic structures. For example, the outer surface of a mobile phone camera is usually installed with a glass cover plate, or the glass cover plates of some mobile phone shells, etc. At the same time, masking ink or patterns are usually provided on the non-light-transmissive surface or decorative surface of the glass cover plate. However, unlike conventional glass surfaces, some masking inks are very easy to be contaminated with oil stains, such as fingerprints, which affect the appearance. The existing solution to this problem is to form an anti-fingerprint coating on the surface of the masking ink by evaporation or vapor deposition. However, on the one hand, this solution has the problems of complex operation process and high difficulty; on the other hand, due to the surface stress difference between the masking ink and the anti-fingerprint coating, the wear resistance of the overall coating will be affected, and there is a risk of wear and falling off when used for a long time or subjected to impact. Summary of the invention

[0003] Aiming at the problems of complicated operation and insufficient wear resistance of existing screen printing ink and anti-fingerprint coating for glass cover plate, the present invention provides a screen printing ink and a screen printing method for glass cover plate.

[0004] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0005] In one aspect, the present invention provides a screen printing ink comprising the following components by weight:

[0006] 25-47 parts of prepolymer, 16-35 parts of monomer, 0.1-2 parts of pigment, 3-7 parts of photoinitiator, 1-5 parts of compound represented by structural formula 1 and 2-7 parts of compound represented by structural formula 2;

[0007]

[0008] Structural formula 1

[0009]

[0010] Structural formula 2

[0011] The monomers include the following weight components:

[0012] 10-15 parts of the first monomer and 6-20 parts of the second monomer;

[0013] The first monomer is selected from perfluorohexylpropylene oxide;

[0014] The prepolymer comprises 10 to 35 parts of epoxy acrylate and 15 to 27 parts of aliphatic polyurethane acrylate.

[0015] Optionally, the second monomer is selected from one or more of isobornyl (meth)acrylate, tricyclodecane dimethanol diacrylate, neopentyl glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, and ethylene glycol diglycidyl ether diacrylate.

[0016] Optionally, the pigment includes one or more of chrome green, titanium dioxide, carbon black, barium titanium dioxide, silver aluminum slurry or cobalt oxide; and the median particle size of the pigment is less than 5 microns.

[0017] Optionally, the screen printing ink further comprises the following components by weight:

[0018] 1~3 parts of filler;

[0019] The filler is selected from one or more of calcium carbonate, barium sulfate, aluminum hydroxide, silicon dioxide, talcum powder and polyvinylidene fluoride powder grafted and modified by glycidyl methacrylate.

[0020] Optionally, the filler is selected from polyvinylidene fluoride powder grafted with glycidyl methacrylate having a median particle size of less than 5 microns.

[0021] Optionally, the photoinitiator includes one or more of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin diethyl ether and phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0022] Optionally, the screen printing ink further comprises 0.1 to 3 parts by weight of an auxiliary agent.

[0023] Optionally, the auxiliary agent includes one or more of a leveling agent and a defoaming agent.

[0024] In another aspect, the present invention provides a glass cover plate screen printing method, comprising the following steps:

[0025] Prepare the silk screen ink as described above, mix the prepolymer, monomer, pigment, photoinitiator, compound shown in structural formula 1 and compound shown in structural formula 2 according to the raw material ratio to obtain silk screen ink;

[0026] A stainless steel screen printing screen is provided, and the stainless steel screen printing screen is immersed in a perfluorohexyl propylene oxide solution, wherein the perfluorohexyl propylene oxide solution contains 2 to 4 parts by weight of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide and 96 to 98 parts by weight of perfluorohexyl propylene oxide;

[0027] After the stainless steel screen printing stencil is taken out, the stainless steel screen printing stencil is cured by ultraviolet light, and while the ultraviolet light curing is being performed, an air pressure difference is formed on both sides of the stainless steel screen printing stencil to form an air flow in the mesh of the stainless steel screen printing stencil;

[0028] The stainless steel screen printing stencil after UV curing is assembled with a fixed frame and placed on the glass cover plate, the screen printing ink is placed on the stainless steel screen printing stencil, and a scraper is used to move back and forth on the stainless steel screen printing stencil 1 to 4 times, and the screen printing ink forms a pattern on the glass cover plate through the mesh of the stainless steel screen printing stencil;

[0029] The glass cover plate is subjected to ultraviolet light curing operation to obtain a glass cover plate with a silk-screen pattern.

[0030] Optionally, the operation of “forming an air pressure difference on both sides of the stainless steel screen printing stencil” includes:

[0031] Apply positive pressure to one side of the stainless steel screen printing stencil, or:

[0032] Negative pressure is applied to one side of the stainless steel screen printing stencil.

[0033] According to the screen printing ink provided by the present invention, epoxy acrylate and aliphatic polyurethane acrylate are used as prepolymers, and perfluorohexyl propylene oxide is added to the monomer. The perfluorohexyl propylene oxide can be grafted into the prepolymer through its epoxy group during the ultraviolet light curing process, so that the prepolymer has a fluorine-containing side chain to improve the anti-fouling and oil-resistant performance of the screen printing ink, and no additional anti-fingerprint layer is required. However, the screen printing ink with perfluorohexyl propylene oxide added has another problem, that is, the wettability between the glass cover plate surface and the screen printing ink decreases, resulting in the screen printing ink shrinking stress during the curing process, resulting in partial depression, and uneven flatness after curing. Insufficient, while causing its wear resistance to decrease; to solve this problem, the inventors further added the compound shown in structural formula 1 and the compound shown in structural formula 2 to the silk screen ink, wherein the siloxane structure of the compound shown in structural formula 1 and the compound shown in structural formula 2 can be bonded to the glass surface through a hydrolysis reaction, and the epoxy group of the compound shown in structural formula 1 can be connected with the prepolymer through ring opening, thereby improving the bonding strength between the silk screen ink and the glass cover plate, and the compound shown in structural formula 2 can improve the wettability of the silk screen ink on the surface of the glass cover plate, which is beneficial to ensure the leveling of the silk screen ink on the surface of the glass cover plate and ensure the flatness of the ink during the curing process. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] An embodiment of the present invention provides a screen printing ink, comprising the following components by weight:

[0036] 25-47 parts of prepolymer, 16-35 parts of monomer, 0.1-2 parts of pigment, 3-7 parts of photoinitiator, 1-5 parts of compound represented by structural formula 1 and 2-7 parts of compound represented by structural formula 2;

[0037]

[0038] Structural formula 1

[0039]

[0040] Structural formula 2

[0041] The monomers include the following weight components:

[0042] 10-15 parts of the first monomer and 6-20 parts of the second monomer;

[0043] The first monomer is selected from perfluorohexylpropylene oxide;

[0044] The prepolymer comprises 10 to 35 parts of epoxy acrylate and 15 to 27 parts of aliphatic polyurethane acrylate.

[0045] The screen printing ink uses epoxy acrylate and aliphatic polyurethane acrylate as prepolymers, and perfluorohexyl propylene oxide is added to the monomer. The perfluorohexyl propylene oxide can be grafted into the prepolymer through its epoxy group during ultraviolet light curing, so that the prepolymer has a fluorine-containing side chain to improve the anti-fouling and oil-resistant performance of the screen printing ink, and no additional anti-fingerprint layer is required. However, the screen printing ink with perfluorohexyl propylene oxide added has another problem, that is, the wettability between the glass cover surface and the screen printing ink decreases, resulting in the shrinkage stress of the screen printing ink during the curing process, resulting in a partial depression, and insufficient flatness after curing. This leads to a decrease in its wear resistance. To solve this problem, the inventors further added the compound shown in Structural Formula 1 and the compound shown in Structural Formula 2 to the silk-screen ink, wherein the siloxane structure of the compound shown in Structural Formula 1 and the compound shown in Structural Formula 2 can be bonded to the glass surface through a hydrolysis reaction, and the epoxy group of the compound shown in Structural Formula 1 can be connected to the prepolymer through an open ring, thereby improving the bonding strength between the silk-screen ink and the glass cover plate, and the compound shown in Structural Formula 2 can improve the wettability of the silk-screen ink on the surface of the glass cover plate, which is beneficial to ensure the leveling of the silk-screen ink on the surface of the glass cover plate and ensure the flatness of the ink during the curing process.

[0046] In some embodiments, the second monomer is selected from one or more of isobornyl (meth)acrylate, tricyclodecane dimethanol diacrylate, neopentyl glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, and ethylene glycol diglycidyl ether diacrylate.

[0047] The second monomer has a small molecular weight and low viscosity. It is used as a solubilizer in silk-screen ink. The monomer participates in the reaction to form a film during ultraviolet light curing. No solvent volatilization occurs during the process, and the monomer has a good environmental protection effect. In a preferred embodiment, based on the total mass of the second monomer as 100%, the second monomer contains 30% by mass of a multifunctional reactive monomer, and the multifunctional reactive monomer includes one or more of tripropylene glycol diacrylate and ethylene glycol diglycidyl ether diacrylate.

[0048] In some embodiments, the pigment includes one or more of chrome green, titanium dioxide, carbon black, barium titanium dioxide, silver aluminum paste or cobalt oxide; and the median particle size of the pigment is less than 5 microns.

[0049] The pigment can be selected according to the actual color to be presented. For example, if the silk screen ink is finally black, carbon black can be selected. If the silk screen ink is finally white, titanium dioxide can be selected. And so on. In some cases, multiple pigments can be used together to obtain a specific color.

[0050] By using pigments with a median particle size of less than 5 microns, it is helpful to ensure the dispersibility of the pigment and the use of the obtained ink in screen printing. When the median particle size of the pigment is too large, it is easy to settle or it is difficult to pass through the mesh during the screen printing process, affecting the film-forming effect.

[0051] In some embodiments, the screen printing ink further comprises the following components by weight:

[0052] 1~3 parts of filler;

[0053] The filler is selected from one or more of calcium carbonate, barium sulfate, aluminum hydroxide, silicon dioxide, talcum powder and polyvinylidene fluoride powder grafted and modified by glycidyl methacrylate.

[0054] The filler is used to enhance the wear resistance of the silk screen printing ink.

[0055] In some embodiments, the filler is selected from polyvinylidene fluoride powder grafted with glycidyl methacrylate having a median particle size of less than 5 micrometers.

[0056] When calcium carbonate, barium sulfate, aluminum hydroxide, silicon dioxide, and talcum powder are used as fillers, their compatibility with the silk-screen ink layer is poor, which easily leads to an increase in the internal stress of the film layer during the curing process, and the improvement in the wear resistance of the silk-screen ink layer is limited. Therefore, the present application preferably uses polyvinylidene fluoride powder grafted with glycidyl methacrylate as a reinforcing filler. The polyvinylidene fluoride powder itself has high wear resistance and toughness. The addition of polyvinylidene fluoride powder is beneficial to improving the wear resistance of the silk-screen ink. At the same time, since the polyvinylidene fluoride powder has good toughness, it can effectively buffer the problem of increased internal stress caused by the open-ring connection of epoxy groups during the curing process of the silk-screen ink, thereby reducing the internal stress of the film layer and improving the stability of the film layer after curing. The properties of the film are good and wear resistance. Due to the difference in polarity, pure polyvinylidene fluoride powder is difficult to fully disperse with other ingredients, resulting in stratification at the interface between the pure polyvinylidene fluoride powder and other materials, affecting the overall strength of the film layer and the realization of its buffering function. By grafting glycidyl methacrylate on the polyvinylidene fluoride powder, the affinity between the polyvinylidene fluoride powder and other ingredients can be improved, which is conducive to full dispersion. More importantly, in the process of photocuring, the unreacted epoxy groups on the glycidyl methacrylate are conducive to forming connecting bonds with other ingredients, thereby improving the overall strength of the film layer, ensuring the uniformity inside the cured film layer, and avoiding the problem of interface stratification. Through the above-mentioned multiple influences, a screen printing ink with excellent wear resistance is finally obtained.

[0057] In some embodiments, based on the total mass of the filler as 100%, the mass percentage content of glycidyl methacrylate grafted on the filler is 4% to 15%.

[0058] In some embodiments, the photoinitiator includes one or more of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin diethyl ether, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0059] In some embodiments, the screen printing ink further comprises 0.1 to 3 parts by weight of an auxiliary agent.

[0060] In some embodiments, the auxiliary agent includes one or more of a leveling agent and a defoaming agent.

[0061] The leveling agent is used to improve the leveling performance of the screen printing ink and improve the flatness of the film layer, and the defoaming agent is used to reduce the bubbles generated in the screen printing ink and avoid the problem of small bubbles in the film layer after curing.

[0062] Another embodiment of the present invention provides a glass cover plate screen printing method, comprising the following steps:

[0063] Prepare the silk screen ink as described above, mix the prepolymer, monomer, pigment, photoinitiator, compound shown in structural formula 1 and compound shown in structural formula 2 according to the raw material ratio to obtain silk screen ink;

[0064] A stainless steel screen printing screen is provided, and the stainless steel screen printing screen is immersed in a perfluorohexyl propylene oxide solution, wherein the perfluorohexyl propylene oxide solution contains 2 to 4 parts by weight of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide and 96 to 98 parts by weight of perfluorohexyl propylene oxide;

[0065] After the stainless steel screen printing stencil is taken out, the stainless steel screen printing stencil is cured by ultraviolet light, and while the ultraviolet light curing is being performed, an air pressure difference is formed on both sides of the stainless steel screen printing stencil to form an air flow in the mesh of the stainless steel screen printing stencil;

[0066] The stainless steel screen printing stencil after UV curing is assembled with a fixed frame and placed on the glass cover plate, the screen printing ink is placed on the stainless steel screen printing stencil, and a scraper is used to move back and forth on the stainless steel screen printing stencil 1 to 4 times, and the screen printing ink forms a pattern on the glass cover plate through the mesh of the stainless steel screen printing stencil;

[0067] The glass cover plate is subjected to ultraviolet light curing operation to obtain a glass cover plate with a silk-screen pattern.

[0068] It should be noted that after adjusting the composition of the silk screen ink, the inventor found that when the original stainless steel silk screen screen was used for silk screen printing, the problem of burrs on the edge of the pattern appeared. The reason is that the fluorine-modified silk screen ink has insufficient wettability to the stainless steel silk screen screen, resulting in excessive surface tension at the mesh holes and uneven penetration of the silk screen ink, especially at the edge. To solve this problem, the inventor placed the stainless steel silk screen screen in a perfluorohexyl propylene oxide solution, and attached a thin layer of fluorine-containing resin to the stainless steel wire of the stainless steel silk screen screen by photocuring and applying a pressure difference. At the same time, due to the continuous airflow between the mesh holes on the stainless steel silk screen screen, the mesh holes can be prevented from being blocked during the curing process. The fluorine-containing resin layer formed on the stainless steel silk screen screen can improve the wettability between the silk screen ink and the stainless steel silk screen screen, and reduce the tension of the silk screen ink at the mesh holes of the stainless steel silk screen screen, thereby effectively solving the problem of edge burrs on the silk screen pattern.

[0069] In some embodiments, the operation of “forming an air pressure difference on both sides of the stainless steel screen printing stencil” includes:

[0070] Apply positive pressure to one side of the stainless steel screen printing stencil, or:

[0071] Negative pressure is applied to one side of the stainless steel screen printing stencil.

[0072] In some embodiments, in the "performing UV light curing operation on the glass cover plate", the glass cover plate is placed in an air atmosphere, the glass cover plate is heated to a temperature of 50°C to 60°C, and kept warm for 30 minutes to 2 hours, and then UV light is applied to the glass cover plate for curing operation.

[0073] By curing in an air atmosphere while maintaining the temperature at 50°C to 60°C, the moisture contained in the air can be used to promote the hydrolysis of the siloxane groups on the compound represented by Structural Formula 1 and the compound represented by Structural Formula 2, so that they can be combined with the surface of the glass cover plate, thereby ensuring the flatness of the cured ink surface in the subsequent UV curing operation.

[0074] The present invention is further described below by way of examples.

[0075] Example 1

[0076] This embodiment is used to illustrate the glass cover plate screen printing method disclosed in the present invention, which includes the following steps:

[0077] The raw materials are mixed according to the following weight ratio to obtain screen printing ink;

[0078] 23 parts of epoxy acrylate, 21 parts of aliphatic polyurethane acrylate, 13 parts of perfluorohexyl propylene oxide, 10 parts of isobornyl (meth)acrylate, 5 parts of tripropylene glycol diacrylate, 0.5 parts of carbon black, 2 parts of polyvinylidene fluoride powder grafted modified by glycidyl methacrylate, 2 parts of the compound shown in structural formula 1, 4 parts of the compound shown in structural formula 2, and 4 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0079] The median particle size of the polyvinylidene fluoride powder grafted with glycidyl methacrylate is 4.3 μm.

[0080] Provided is a stainless steel screen printing screen, on which a planar pattern and a CD grain pattern (mesh pattern) are arranged, and the stainless steel screen printing screen is immersed in a perfluorohexyl propylene oxide solution, wherein the perfluorohexyl propylene oxide solution contains 3 parts by weight of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide and 97 parts by weight of perfluorohexyl propylene oxide;

[0081] After the stainless steel screen printing stencil is taken out, the stainless steel screen printing stencil is cured by ultraviolet light, and while the ultraviolet light curing is being performed, a centrifugal fan is used to continuously suck on one side of the stainless steel to form an airflow in the mesh of the stainless steel screen printing stencil;

[0082] The stainless steel screen printing stencil after UV curing is assembled with a fixed frame and placed on the glass cover plate, the screen printing ink is placed on the stainless steel screen printing stencil, and a scraper is used to move back and forth on the stainless steel screen printing stencil twice, and the screen printing ink forms a pattern on the glass cover plate through the mesh of the stainless steel screen printing stencil;

[0083] After the silk-screen printing operation, the glass cover plate is placed in an air atmosphere, heated to a temperature of 55° C., kept warm for 1 hour, and then subjected to ultraviolet light curing operation to obtain a glass cover plate with a silk-screen pattern.

[0084] Example 2

[0085] This embodiment is used to illustrate the glass cover plate screen printing method disclosed in the present invention, and includes most of the operation steps in Example 1, except that:

[0086] The silk screen printing ink is mixed with the following raw materials in the following weight ratio:

[0087] 31 parts of epoxy acrylate, 15 parts of aliphatic polyurethane acrylate, 15 parts of perfluorohexyl propylene oxide, 5 parts of isobornyl (meth)acrylate, 11 parts of tripropylene glycol diacrylate, 0.5 parts of carbon black, 2 parts of polyvinylidene fluoride powder grafted modified by glycidyl methacrylate, 4 parts of the compound shown in structural formula 1, 2 parts of the compound shown in structural formula 2, and 4 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0088] Example 3

[0089] This embodiment is used to illustrate the glass cover plate screen printing method disclosed in the present invention, and includes most of the operation steps in Example 1, except that:

[0090] The silk screen printing ink is mixed with the following raw materials in the following weight ratio:

[0091] 16 parts of epoxy acrylate, 24 parts of aliphatic polyurethane acrylate, 11 parts of perfluorohexyl propylene oxide, 10 parts of isobornyl (meth)acrylate, 6 parts of tripropylene glycol diacrylate, 0.5 parts of carbon black, 2 parts of polyvinylidene fluoride powder grafted modified by glycidyl methacrylate, 4 parts of the compound shown in structural formula 1, 2 parts of the compound shown in structural formula 2, and 4 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0092] Example 4

[0093] This embodiment is used to illustrate the glass cover plate screen printing method disclosed in the present invention, and includes most of the operation steps in Example 1, except that:

[0094] The silk screen printing ink is mixed with the following raw materials in the following weight ratio:

[0095] 23 parts of epoxy acrylate, 21 parts of aliphatic polyurethane acrylate, 13 parts of perfluorohexyl propylene oxide, 10 parts of isobornyl (meth) acrylate, 5 parts of tripropylene glycol diacrylate, 0.5 parts of carbon black, 2 parts of polyvinylidene fluoride powder, 2 parts of the compound represented by structural formula 1, 4 parts of the compound represented by structural formula 2, and 4 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0096] The median particle size of the polyvinylidene fluoride powder is 3.8 microns.

[0097] Example 5

[0098] This embodiment is used to illustrate the glass cover plate screen printing method disclosed in the present invention, and includes most of the operation steps in Example 1, except that:

[0099] The silk screen printing ink is mixed with the following raw materials in the following weight ratio:

[0100] 23 parts of epoxy acrylate, 21 parts of aliphatic polyurethane acrylate, 13 parts of perfluorohexyl propylene oxide, 10 parts of isobornyl (meth) acrylate, 5 parts of tripropylene glycol diacrylate, 0.5 parts of carbon black, 2 parts of silica, 2 parts of the compound represented by structural formula 1, 4 parts of the compound represented by structural formula 2, and 4 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0101] The median particle size of the silica was 2.1 microns.

[0102] Example 6

[0103] This embodiment is used to illustrate the glass cover plate screen printing method disclosed in the present invention, and includes most of the operation steps in Example 1, except that:

[0104] After the silk-screen printing operation, the glass cover plate is directly subjected to an ultraviolet light curing operation without performing a temperature increase operation, thereby obtaining a glass cover plate having a silk-screen printing pattern.

[0105] Comparative Example 1

[0106] This comparative example is used to compare and illustrate the glass cover plate screen printing method disclosed in the present invention, and includes most of the operation steps in Example 1, except that:

[0107] The silk screen printing ink is mixed with the following raw materials in the following weight ratio:

[0108] 23 parts of epoxy acrylate, 21 parts of aliphatic polyurethane acrylate, 23 parts of isobornyl (meth)acrylate, 5 parts of tripropylene glycol diacrylate, 0.5 parts of carbon black, 2 parts of polyvinylidene fluoride powder grafted modified by glycidyl methacrylate, 2 parts of the compound shown in structural formula 1, 4 parts of the compound shown in structural formula 2, and 4 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0109] Comparative Example 2

[0110] This comparative example is used to compare and illustrate the glass cover plate screen printing method disclosed in the present invention, and includes most of the operation steps in Example 1, except that:

[0111] The silk screen printing ink is mixed with the following raw materials in the following weight ratio:

[0112] 23 parts of epoxy acrylate, 21 parts of aliphatic polyurethane acrylate, 13 parts of perfluorohexyl propylene oxide, 10 parts of isobornyl (meth) acrylate, 5 parts of tripropylene glycol diacrylate, 0.5 parts of carbon black, 2 parts of polyvinylidene fluoride powder grafted modified by glycidyl methacrylate, 2 parts of the compound shown in structural formula 1, and 4 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0113] Comparative Example 3

[0114] This comparative example is used to compare and illustrate the glass cover plate screen printing method disclosed in the present invention, and includes most of the operation steps in Example 1, except that:

[0115] The silk screen printing ink is mixed with the following raw materials in the following weight ratio:

[0116] 23 parts of epoxy acrylate, 21 parts of aliphatic polyurethane acrylate, 13 parts of perfluorohexyl propylene oxide, 10 parts of isobornyl (meth) acrylate, 5 parts of tripropylene glycol diacrylate, 0.5 parts of carbon black, 2 parts of polyvinylidene fluoride powder grafted modified by glycidyl methacrylate, 4 parts of the compound shown in structural formula 2, and 4 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0117] Comparative Example 4

[0118] This comparative example is used to compare and illustrate the glass cover plate screen printing method disclosed in the present invention, and includes most of the operation steps in Example 1, except that:

[0119] The stainless steel screen printing stencil is not subjected to additional soaking and curing operations, and the pattern of the screen printing ink is directly screen printed using the stainless steel screen printing stencil.

[0120] Comparative Example 5

[0121] This comparative example is used to compare and illustrate the glass cover plate screen printing method disclosed in the present invention, and includes most of the operation steps in Example 1, except that:

[0122] After the stainless steel screen printing stencil is taken out, the stainless steel screen printing stencil is directly cured by ultraviolet light without performing the suction operation of the centrifugal fan.

[0123] Performance Testing

[0124] The glass cover plates prepared in the above Examples 1 to 6 and Comparative Examples 1 to 5 were subjected to the following performance tests:

[0125] 1. Contact angle test: A contact angle measuring instrument was used to test the contact angle of hexadecane on the block pattern of each embodiment and comparative example sample.

[0126] 2. Friction test: The prepared glass cover plate was fixed by a clamp, and steel wool was clamped by a robot to fit the surface of each embodiment and comparative example sample. The same force was set by the robot to push the steel wool back and forth for surface friction. After 500 reciprocating frictions, the contact angle of hexadecane on each embodiment and comparative example sample was tested again by a contact angle meter.

[0127] 3. Pattern forming effect test: Evaluate the CD grain pattern by visual inspection and record the CD grain pattern forming effect.

[0128] The test results obtained are entered in Table 1.

[0129] Table 1

[0130]

[0131]

[0132] It can be seen from the test results in Table 1 that compared with other silk-screen inks, the glass cover plate formed by the glass cover plate silk-screen printing method provided by the present invention has a larger contact angle, indicating that the silk-screen ink provided by the present invention has good oleophobic properties, and still maintains good oleophobic properties after multiple frictions, and has excellent anti-wear performance.

[0133] From the test results of Examples 1 to 3 and Examples 4 and 5, it can be seen that the polyvinylidene fluoride powder grafted with glycidyl methacrylate as a reinforcing filler can effectively improve the wear resistance of the ink and avoid the problem of decreased oleophobicity due to wear.

[0134] It can be seen from the test results of Examples 1 to 6 and Comparative Example 4 that by soaking and curing the stainless steel screen printing stencil, the tension of the screen printing ink at the mesh of the stainless steel screen printing stencil can be effectively reduced, and the edge burr problem of the screen printing pattern can be effectively solved. It can be seen from the test results of Comparative Example 5 that during the curing process of the stainless steel screen printing stencil, the suction operation can avoid mesh occlusion and ensure the screen printing effect.

[0135] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A glass cover plate screen printing method, characterized in that: The steps include: A screen printing ink is prepared, wherein the screen printing ink comprises the following components by weight: 25-47 parts of prepolymer, 16-35 parts of monomer, 0.1-2 parts of pigment, 3-7 parts of photoinitiator, 1-5 parts of compound represented by structural formula 1 and 2-7 parts of compound represented by structural formula 2; Structural formula 1 Structural formula 2 The monomers include the following weight components: 10-15 parts of the first monomer and 6-20 parts of the second monomer; The first monomer is selected from perfluorohexylpropylene oxide; Wherein, the prepolymer comprises 10 to 35 parts of epoxy acrylate and 15 to 27 parts of aliphatic polyurethane acrylate; The prepolymer, the monomer, the pigment, the photoinitiator, the compound represented by the structural formula 1 and the compound represented by the structural formula 2 are mixed according to the raw material ratio to obtain a screen printing ink; A stainless steel screen printing screen is provided, and the stainless steel screen printing screen is immersed in a perfluorohexyl propylene oxide solution, wherein the perfluorohexyl propylene oxide solution contains 2 to 4 parts by weight of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide and 96 to 98 parts by weight of perfluorohexyl propylene oxide; After the stainless steel screen printing stencil is taken out, the stainless steel screen printing stencil is cured by ultraviolet light, and while the ultraviolet light curing is being performed, an air pressure difference is formed on both sides of the stainless steel screen printing stencil to form an air flow in the mesh of the stainless steel screen printing stencil; The stainless steel screen printing stencil after UV curing is assembled with a fixed frame and placed on the glass cover plate, the screen printing ink is placed on the stainless steel screen printing stencil, and a scraper is used to move back and forth on the stainless steel screen printing stencil 1 to 4 times, and the screen printing ink forms a pattern on the glass cover plate through the mesh of the stainless steel screen printing stencil; The glass cover plate is subjected to ultraviolet light curing operation to obtain a glass cover plate with a silk-screen pattern.

2. The glass cover plate screen printing method according to claim 1, characterized in that: The second monomer is selected from one or more of isobornyl (meth)acrylate, tricyclodecane dimethanol diacrylate, neopentyl glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, and ethylene glycol diglycidyl ether diacrylate.

3. The glass cover plate screen printing method according to claim 1, characterized in that: The pigment includes one or more of chrome green, titanium dioxide, carbon black, barium titanium dioxide, silver aluminum slurry or cobalt oxide; and the median particle size of the pigment is less than 5 microns.

4. The glass cover plate screen printing method according to claim 1, characterized in that: The silk screen printing ink also includes the following weight components: 1~3 parts of filler; The filler is selected from one or more of calcium carbonate, barium sulfate, aluminum hydroxide, silicon dioxide, talcum powder and polyvinylidene fluoride powder grafted and modified by glycidyl methacrylate.

5. The glass cover plate screen printing method according to claim 4, characterized in that: The filler is selected from polyvinylidene fluoride powder grafted with glycidyl methacrylate having a median particle size of less than 5 microns.

6. The glass cover plate screen printing method according to claim 1, characterized in that: The photoinitiator includes one or more of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin diethyl ether and phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide.

7. The glass cover plate screen printing method according to claim 1, characterized in that: The screen printing ink also includes 0.1 to 3 parts by weight of an auxiliary agent.

8. The glass cover plate screen printing method according to claim 7, characterized in that: The auxiliary agent includes one or more of a leveling agent and a defoaming agent.

9. The glass cover plate screen printing method according to claim 1, characterized in that: The operation of "forming an air pressure difference on both sides of the stainless steel screen printing stencil" includes: Apply positive pressure to one side of the stainless steel screen printing stencil, or: Negative pressure is applied to one side of the stainless steel screen printing stencil.

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