CN116285488A

CN116285488A - UV (ultraviolet) ink and rubbing method for UV ink on front surface of camera cover plate

Info

Publication number: CN116285488A
Application number: CN202310321495.7A
Authority: CN
Inventors: 沈福根; 杜青
Original assignee: Shenzhen Ruiou Optics Co ltd
Current assignee: Shenzhen Ruiou Optics Co ltd
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-06-23
Anticipated expiration: 2043-03-29
Also published as: CN116285488B

Abstract

In order to solve the problem of insufficient wear resistance of the existing UV ink, the invention provides UV ink which comprises the following components in parts by weight: 32 to 56 parts of prepolymer, 24 to 42 parts of monomer, 0.1 to 1 part of pigment, 0.1 to 2 parts of silane coupling agent, 2 to 12 parts of filler and 3 to 7 parts of photoinitiator; wherein the prepolymer comprises 15-20 parts of epoxy acrylate and 17-36 parts of aliphatic polyurethane acrylate; the filler is selected from glycidyl methacrylate grafted modified polyvinylidene fluoride powder. Meanwhile, the invention also discloses a rubbing method of the UV ink on the front surface of the camera cover plate. The film layer of the UV ink after curing has the effects of excellent wear resistance and impact resistance.

Description

UV (ultraviolet) ink and rubbing method for UV ink on front surface of camera cover plate

Technical Field

The invention belongs to the technical field of new materials, and particularly relates to UV (ultraviolet) ink and a rubbing method of the UV ink on the front surface of a camera cover plate.

Background

With miniaturization and refinement of consumer electronic products such as digital cameras, mobile phones, palm top computers (PDAs), and even video game devices, optical image pickup devices are often installed in such electronic products, and the optical image pickup devices installed therein are required to have higher performance.

In the existing electronic product design, in order to protect a camera of an electronic product, a transparent cover plate is generally arranged at the position of the camera, and the transparent cover plate can ensure the image shooting of the camera and also plays a role in protection.

For local shading, design pattern display, logo display or other effects, a UV ink layer is usually required to be arranged on a camera cover plate, and the existing UV ink layer has the defect of insufficient wear resistance and can be generally only arranged on the back of the camera cover plate, namely, the camera cover plate can protect the UV ink layer, however, in some cases, the UV ink layer arranged on the back can influence the flatness of the back of the camera cover plate, particularly, due to a certain hollow structure, the sealing performance of the camera cover plate is caused, and the additional sealing structure design is required, so that how to arrange the UV ink layer on the front of the camera cover plate and enable the UV ink layer to meet the wear resistance requirement is a problem which needs to be solved urgently.

The prior art for improving the wear resistance of the UV ink layer is mainly determined by two aspects, namely the bonding strength between the UV ink layer and a base material and the material strength of the UV ink layer; the existing mode for improving the wear resistance of the UV ink layer mainly comprises the steps of selecting a main resin, modifying the surface of a substrate and adding a wear-resistant filler, wherein the main resin is smaller in selection range because the main resin needs to meet the requirement of UV curing, the surface modification of the substrate only can improve the bonding strength with the substrate and can not solve the problem that the material is not wear-resistant, and the adding of the wear-resistant filler improves the hardness of the film layer, but the existing wear-resistant filler is mainly an inorganic filler, is poor in compatibility with the UV ink layer, easily causes the stress in the film layer to be increased in the curing process, and also affects the bonding force between the film layer and the substrate when the main resin is excessively added, so that the wear resistance of the UV ink layer by adding the wear-resistant filler is improved only.

Disclosure of Invention

Aiming at the problem of insufficient wear resistance of the existing UV ink, the invention provides a rubbing method of the UV ink and the UV ink on the front surface of a camera cover plate.

The technical scheme adopted by the invention for solving the technical problems is as follows:

in one aspect, the invention provides a UV ink comprising the following components in parts by weight:

32 to 56 parts of prepolymer, 24 to 42 parts of monomer, 0.1 to 1 part of pigment, 0.1 to 2 parts of silane coupling agent, 2 to 12 parts of filler and 3 to 7 parts of photoinitiator;

wherein the prepolymer comprises 15-20 parts of epoxy acrylate and 17-36 parts of aliphatic polyurethane acrylate;

the filler is selected from glycidyl methacrylate grafted modified polyvinylidene fluoride powder.

Optionally, the mass percentage content of the grafted glycidyl methacrylate on the filler is 4-15% based on 100% of the total mass of the filler.

Optionally, the median particle diameter of the filler is 1-10 μm.

Optionally, the monomer comprises one or more of isobornyl (meth) acrylate, tricyclodecane dimethanol diacrylate, neopentyl glycol diacrylate, dipropylene glycol diacrylate and tripropylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, ethylene glycol diglycidyl ether diacrylate.

Optionally, the pigment comprises one or more of chrome green, titanium white, carbon black, lithopone, silver aluminum paste or cobalt oxide.

Optionally, the silane coupling agent comprises one or more of 3-aminopropyl triethoxysilane, 3-glycidoxy trimethoxysilane, aniline methyl triethoxysilane, aniline methyl trimethoxysilane and gamma-methacryloxypropyl trimethoxysilane.

Optionally, the photoinitiator comprises one or more of diphenyl- (2, 4, 6-trimethylbenzoyl) oxy-phosphorus, 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin diethyl ether and phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide.

Optionally, the UV ink further comprises 0.1-3 parts by weight of an auxiliary agent, wherein the auxiliary agent comprises one or more of a leveling agent and a defoaming agent.

On the other hand, the invention provides a rubbing method of UV ink on the front surface of a camera cover plate, which comprises the following operation steps:

preparing the UV ink, and mixing the prepolymer, the monomer, the pigment, the silane coupling agent, the filler and the photoinitiator according to the raw material ratio to obtain the UV ink;

setting a template with a raised pattern on the surface, and coating UV ink on the surface of the template;

providing a transparent glass substrate as a camera cover plate substrate, forming a plurality of dot-shaped shallow grooves which are arranged in a matrix at preset positions of a front pattern of the camera cover plate substrate through wet etching, contacting the surface of a template with a raised pattern with the front of the camera cover plate substrate under a negative pressure condition, separating the template, and applying UV ink to the preset positions of the front pattern of the camera cover plate substrate;

a mask is arranged to cover the back surface of the camera cover plate base material, a plurality of through holes are formed in the mask, the positions and the shapes of the through holes are in one-to-one correspondence with the plurality of dot-shaped shallow grooves, and a UV light source is applied to the back surface of the camera cover plate base material to pre-cure UV ink in the plurality of dot-shaped shallow grooves;

and removing the mask, and continuously irradiating by using a UV light source to completely cure the UV ink on the front surface of the camera cover plate substrate.

Optionally, the wet etching operation of the camera cover board substrate comprises the following operation steps:

coating photoresist on the front and back of the camera head cover plate substrate, performing local exposure and development on the photoresist on the front of the camera head cover plate substrate, forming a plurality of through holes on the photoresist, exposing the lower camera head cover plate substrate at the through hole parts, arranging the plurality of through holes at preset positions of the front pattern of the camera head cover plate substrate in a matrix, wherein the inner diameter of the through holes is 200-2000 mu m, and the interval between the through holes is 600-3000 mu m;

immersing the camera cover plate substrate covered with the photoresist into etching liquid, etching the front surface of the camera cover plate substrate by the etching liquid through the through holes to form a plurality of dot-shaped shallow grooves, wherein the depth of each dot-shaped shallow groove is 1-20 um, taking out the camera cover plate substrate, and washing to remove the photoresist.

According to the UV ink provided by the invention, the epoxy acrylate and the aliphatic polyurethane acrylate are adopted as the prepolymer, the silane coupling agent is adopted, the bonding strength between the UV ink and the glass substrate can be improved, the polyvinylidene fluoride powder grafted and modified by the glycidyl methacrylate is also added as the reinforcing filler, the polyvinylidene fluoride powder has higher wear resistance and toughness, the wear resistance of the UV ink is improved by adding the polyvinylidene fluoride powder, and meanwhile, the polyvinylidene fluoride powder has better toughness, so that a certain buffer effect can be effectively generated for the problem of internal stress increase caused by ring-opening connection of epoxy groups in the curing process of the UV ink, the internal stress of the film is further reduced, the stability and wear resistance of the cured film are improved, the problem that the pure polyvinylidene fluoride powder is difficult to fully disperse with other components exists due to polarity difference, the connection interface of the pure polyvinylidene fluoride powder and other materials is layered, the integral strength of the film is influenced, and the realization of the buffer function is influenced; through carrying out glycidyl methacrylate grafting modification on polyvinylidene fluoride powder, can improve the affinity between polyvinylidene fluoride powder and other components, do benefit to abundant dispersion, more importantly, at the in-process of photocuring, unreacted epoxy group on the glycidyl methacrylate does benefit to and forms the tie with other components between, improve the integrated intensity of rete, guaranteed the inside homogeneity of solidification rete, avoid the problem of interface layering, through above-mentioned many aspects influence, finally obtain the UV printing ink that the wearability is excellent, satisfy the requirement of rubbing in camera lid front face.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The embodiment of the invention provides UV ink, which comprises the following components in parts by weight:

The glycidyl methacrylate graft modified polyvinylidene fluoride powder can be prepared by existing methods, for example: and (3) treating the polyvinylidene fluoride powder by adopting a radiation mode, placing the polyvinylidene fluoride powder in the glycidyl methacrylate emulsion, heating and polymerizing the polyvinylidene fluoride powder in a protective atmosphere state, filtering the polyvinylidene fluoride powder, washing the polyvinylidene fluoride powder with water, and drying the polyvinylidene fluoride powder to obtain the glycidyl methacrylate grafted and modified polyvinylidene fluoride powder.

In some embodiments, the UV ink consists of the following weight components:

32 to 56 parts of prepolymer, 24 to 42 parts of monomer, 0.1 to 1 part of pigment, 0.1 to 2 parts of silane coupling agent, 2 to 12 parts of filler and 3 to 7 parts of photoinitiator.

In specific embodiments, the weight portion of the filler in the UV ink may be 2 parts, 2.2 parts, 2.4 parts, 2.7 parts, 2.9 parts, 3 parts, 3.2 parts, 3.5 parts, 3.8 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 7.8 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, or 10 parts.

If the weight part of the filler is too low, the abrasion resistance of the filler to the UV ink is not obviously improved; if the weight portion of the filler is too high, the reduction of the main crosslinking resin in the UV ink is easy to cause, so that the construction of a crosslinking network in the UV ink is not facilitated, and the improvement of the wear resistance is also not facilitated.

In some embodiments, the amount of glycidyl methacrylate grafted onto the filler is 4% to 15% by mass, based on 100% by mass of the filler.

In particular embodiments, the amount of glycidyl methacrylate grafted onto the filler may be 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 7.8%, 8.5%, 9%, 9.5%, 10%, 11%, 13%, 13.2%, 13.5%, 13.8%, 14%, 14.5% or 15% by mass based on 100% of the total mass of the filler.

In some embodiments, the filler has a median particle size of 1 to 10 μm.

In particular embodiments, the median particle size of the filler may be 1.0 μm, 1.2 μm, 1.4 μm, 1.7 μm, 1.9 μm, 2.1 μm, 2.2 μm, 2.4 μm, 2.7 μm, 2.9 μm, 3 μm, 3.2 μm, 3.5 μm, 3.8 μm, 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 7.8 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm or 10 μm.

If the median particle diameter of the filler is too low, higher production process requirements exist, and the manufacturing cost is higher; if the median particle diameter of the filler is high, its dispersion effect in the UV ink is affected.

In some embodiments, the monomer comprises one or more of isobornyl (meth) acrylate, tricyclodecane dimethanol diacrylate, neopentyl glycol diacrylate, dipropylene glycol diacrylate, and tripropylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, ethylene glycol diglycidyl ether diacrylate.

The monomer has smaller molecular weight and low viscosity, is used as a solvent in the UV ink, participates in reaction film formation in the UV light curing process, does not generate solvent volatilization in the process, and has better environmental protection effect, and in a preferred embodiment, the monomer contains 30 mass percent of polyfunctional group reaction monomer, wherein the polyfunctional group reaction monomer comprises one or more of propylene glycol diacrylate and ethylene glycol diglycidyl ether diacrylate, calculated by the total mass of the monomer as 100 percent.

In some embodiments, the pigment comprises one or more of chrome green, titanium dioxide, carbon black, lithopone, silver aluminum paste, or cobalt oxide.

The choice of pigment may be selected based on the actual color to be rendered, e.g., carbon black may be selected if the UV ink is ultimately rendered black, titanium dioxide may be selected if the UV ink is ultimately rendered white, and so on, in some cases, multiple pigments may be used together to achieve a particular color match.

In some embodiments, the silane coupling agent includes one or more of 3-aminopropyl triethoxysilane, 3-glycidoxy trimethoxysilane, aniline methyl triethoxysilane, aniline methyl trimethoxysilane, and gamma-methacryloxypropyl trimethoxysilane.

The silane coupling agent has organic functional groups and siloxy groups, wherein the siloxy groups have reactivity to inorganic matters, especially to glass substrates, can be bonded with the glass substrates through hydrolytic condensation reaction, and the organic functional groups can be connected with other resin materials of the UV ink, so that the effect of improving the adhesive force of the UV ink on the surfaces of the glass substrates is achieved.

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

In some embodiments, the UV ink further comprises 0.1 to 3 parts by weight of an auxiliary agent comprising one or more of a leveling agent, an antifoaming agent.

In the process of curing the UV ink on the glass substrate, shrinkage is inevitably generated in the curing process, so that internal stress is generated on the surfaces of the UV ink and the glass substrate, the internal stress has adverse effects on the adhesive force of a cured film layer of the UV ink, and particularly, when the curing speed of the UV ink is too high, the generated internal stress is larger, mainly because of simultaneous curing shrinkage of all positions, and the internal stress is superposed.

In order to solve the above problems, another embodiment of the present invention provides a rubbing method for UV ink on the front surface of a camera cover plate, which includes the following steps:

On one hand, the front surface UV ink rubbing method of the camera cover plate is characterized in that a plurality of dot-shaped shallow grooves are formed in the front surface of the camera cover plate base material, stress interfaces are located on different planes through the recessed embedded structure, interface stress of the UV ink in contact with the camera cover plate base material can be dispersed to a certain extent, and stress concentration phenomenon is avoided; on the other hand, when the UV is cured, the UV ink in the spot shallow groove is pre-cured, and then the UV ink at other positions is uniformly cured, so that the problem of interface stress increase caused by one-time curing of the UV ink is avoided.

When the UV ink is applied to the preset position of the front pattern of the camera cover substrate, the operation needs to be performed under a negative pressure condition, wherein the negative pressure is favorable for removing bubbles at the positions of the dot-shaped shallow grooves, so that residual bubbles in the cured film layer are avoided, and the negative pressure condition refers to a condition lower than the atmospheric pressure, for example, a vacuum condition can be adopted.

In some embodiments, the wet etching operation of the camera cover plate substrate includes the following operational steps:

coating photoresist on the front and back of the camera head cover plate substrate, performing local exposure and development on the photoresist on the front of the camera head cover plate substrate, forming a plurality of through holes on the photoresist, exposing the lower camera head cover plate substrate at the through hole parts, arranging the plurality of through holes at preset positions of the front pattern of the camera head cover plate substrate in a matrix, wherein the inner diameter of the through holes is 200-2000 mu m, and the interval between the through holes is 600-3000 mu m; correspondingly, the inner diameter and the interval of the punctiform shallow grooves are consistent with those of the through holes.

The depth of the dot-shaped shallow groove needs to be kept at a certain depth so that the surface of the UV ink is kept smooth through self leveling and surface tension, and if the depth of the dot-shaped shallow groove is too deep, the surface of the cured UV ink is rough and cannot achieve a bright surface effect.

In some embodiments, the etching solution is hydrofluoric acid with the mass concentration of 10% -30%, the etching temperature is 30 ℃ -45 ℃, and the etching time is 1 min-30 min.

The invention is further illustrated by the following examples.

Example 1

The embodiment is used for explaining the camera cover plate and the preparation method thereof, and comprises the following operation steps:

mixing the raw materials according to the following weight proportion to obtain UV printing ink;

20 parts of epoxy acrylate, 30 parts of aliphatic polyurethane acrylate, 12 parts of isobornyl (meth) acrylate, 20 parts of ethylene glycol diglycidyl ether diacrylate, 0.3 part of carbon black, 0.5 part of 3-aminopropyl triethoxysilane, 3 parts of glycidyl methacrylate grafted modified polyvinylidene fluoride powder and 4 parts of diphenyl- (2, 4, 6-trimethylbenzoyl) phosphorus oxide.

Wherein the grafting ratio (mass percent of the glycidyl methacrylate) of the glycidyl methacrylate grafted modified polyvinylidene fluoride powder is 5%, and the median particle diameter is 5.7 mu m.

A template with a raised pattern on the surface is arranged, and UV ink is coated on the surface of the template.

The method comprises the steps of adopting a transparent glass substrate as a camera cover plate substrate, coating photoresist on the front side and the back side of the camera cover plate substrate, carrying out local exposure and development on the photoresist on the front side of the camera cover plate substrate, forming a plurality of through holes on the photoresist, exposing the lower camera cover plate substrate at the through hole parts, wherein the through holes are circular, the plurality of through holes are arranged at preset positions of a front pattern of the camera cover plate substrate in a matrix manner, the inner diameter of each through hole is 200 mu m, and the interval between the through holes is 600 mu m;

immersing the camera cover plate substrate covered with the photoresist in an etching solution with the mass concentration of 20%, etching the front surface of the camera cover plate substrate by the etching solution through the through holes to form a plurality of point-shaped shallow grooves, wherein the etching time is 6min, the depth of the point-shaped shallow grooves is 2.3um, taking out the camera cover plate substrate, washing the camera cover plate substrate, and removing the photoresist;

the surface of the template with the raised patterns is contacted with the front surface of the camera cover plate base material under the vacuum condition, and the template is separated, so that UV ink is applied to the preset position of the front surface pattern of the camera cover plate base material;

a mask is arranged to cover the back surface of the camera cover plate base material, a plurality of through holes are formed in the mask, the positions and the shapes of the through holes are in one-to-one correspondence with the plurality of dot-shaped shallow grooves, a UV light source is applied to the back surface of the camera cover plate base material to pre-cure UV ink in the plurality of dot-shaped shallow grooves, and the pre-curing time is 2min;

Example 2

The embodiment is used for explaining the camera cover plate and the preparation method thereof disclosed by the invention, and comprises most of the operation steps in embodiment 1, wherein the difference is that:

the UV ink is prepared by mixing the following raw materials in parts by weight:

16 parts of epoxy acrylate, 36 parts of aliphatic polyurethane acrylate, 10 parts of isobornyl (meth) acrylate, 17 parts of ethylene glycol diglycidyl ether diacrylate, 0.3 part of carbon black, 0.5 part of 3-aminopropyl triethoxysilane, 10 parts of glycidyl methacrylate grafted modified polyvinylidene fluoride powder and 5 parts of diphenyl- (2, 4, 6-trimethylbenzoyl) phosphorus oxide.

Example 3

18 parts of epoxy acrylate, 21 parts of aliphatic polyurethane acrylate, 20 parts of isobornyl (meth) acrylate, 15 parts of ethylene glycol diglycidyl ether diacrylate, 0.3 part of carbon black, 0.5 part of 3-aminopropyl triethoxysilane, 6 parts of glycidyl methacrylate grafted modified polyvinylidene fluoride powder and 5 parts of diphenyl- (2, 4, 6-trimethylbenzoyl) phosphorus oxide.

Example 4

the grafting ratio (mass percent of glycidyl methacrylate) of the glycidyl methacrylate graft modified polyvinylidene fluoride powder was 9%.

Example 5

the grafting ratio (mass percent of glycidyl methacrylate) of the glycidyl methacrylate graft modified polyvinylidene fluoride powder was 15%.

Example 6

the median particle diameter of the glycidyl methacrylate graft modified polyvinylidene fluoride powder was 50 μm.

Comparative example 1

This comparative example is used for comparison to illustrate the camera cover plate and the preparation method thereof disclosed in the present invention, and comprises most of the operation steps in embodiment 1, which are different in that:

20 parts of epoxy acrylate, 30 parts of aliphatic polyurethane acrylate, 12 parts of isobornyl (meth) acrylate, 20 parts of ethylene glycol diglycidyl ether diacrylate, 0.3 part of carbon black, 0.5 part of 3-aminopropyl triethoxysilane and 4 parts of diphenyl- (2, 4, 6-trimethylbenzoyl) phosphorus oxide.

Comparative example 2

20 parts of epoxy acrylate, 30 parts of aliphatic polyurethane acrylate, 12 parts of isobornyl (meth) acrylate, 20 parts of ethylene glycol diglycidyl ether diacrylate, 0.3 part of carbon black, 0.5 part of 3-aminopropyl triethoxysilane, 3 parts of fumed silica powder and 4 parts of diphenyl- (2, 4, 6-trimethylbenzoyl) phosphorus oxide.

Comparative example 3

20 parts of epoxy acrylate, 30 parts of aliphatic polyurethane acrylate, 12 parts of isobornyl (meth) acrylate, 20 parts of ethylene glycol diglycidyl ether diacrylate, 0.3 part of carbon black, 0.5 part of 3-aminopropyl triethoxysilane, 3 parts of polyvinylidene fluoride powder and 4 parts of diphenyl- (2, 4, 6-trimethylbenzoyl) phosphorus oxide.

Comparative example 4

etching of the spot shallow grooves is not carried out on the camera cover plate base material;

the surface of the template with the raised pattern is contacted with the front surface of the camera cover plate substrate under the direct vacuum condition, and the template is separated, so that UV ink is applied to the preset position of the front surface pattern of the camera cover plate substrate;

a mask is arranged to cover the back surface of the camera cover plate base material, a plurality of through holes are formed in the mask, a UV light source is applied to the back surface of the camera cover plate base material to pre-cure UV ink in the through holes, and the pre-curing time is 2min;

Comparative example 5

and after the UV ink is applied to the preset position of the front pattern of the camera cover plate substrate, a mask is not arranged, and a UV light source is directly applied to the back surface of the camera cover plate substrate to cure the UV ink.

Performance testing

The following performance tests were performed on the camera covers prepared in examples 1 to 6 and comparative examples 1 to 5 described above:

1. friction test: fixing the prepared camera cover plate through a clamp, clamping steel wool on the surfaces of samples of each example and comparative example by using a mechanical arm, setting the same acting force by using the mechanical arm, pushing the steel wool back and forth to perform surface friction, and recording the percentage of the damaged area of the surface UV film layer to the total area of the surface UV film layer after the back and forth friction is 500 times.

2. Impact test: and fixing the prepared camera cover plate through a platform, performing a ball impact test at the position of 20cm at the top of the camera cover plate, wherein the weight of the ball is 0.2kg, the impact point is the central position of the surface UV film layer, and recording the crack condition of the UV film layer after 100 times of reciprocating impact.

The test results obtained are filled in Table 1.

TABLE 1

As can be seen from the test results of Table 1, compared with other UV inks, the camera cover plate formed by the UV ink provided by the invention has better wear resistance, and meanwhile, the internal stress of the cured film layer can be reduced better through changing the glass substrate and the UV curing mode, so that the impact resistance and wear resistance of the camera cover plate are improved.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. The UV ink is characterized by comprising the following components in parts by weight:

2. UV ink according to claim 1, characterized in that the content of glycidyl methacrylate grafted on the filler is 4% to 15% by mass, based on 100% by mass of the total filler.

3. UV ink according to claim 1, wherein the filler has a median particle size of 1 to 10 μm.

4. The UV ink according to claim 1, wherein the monomer comprises one or more of isobornyl (meth) acrylate, tricyclodecane dimethanol diacrylate, neopentyl glycol diacrylate, propylene glycol triacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, ethylene glycol diglycidyl ether diacrylate.

5. The UV ink according to claim 1, wherein the pigment comprises one or more of chrome green, titanium white, carbon black, lithopone, silver aluminum paste, or cobalt oxide.

6. The UV ink according to claim 1, wherein the silane coupling agent comprises one or more of 3-aminopropyl triethoxysilane, 3-glycidoxy trimethoxysilane, aminomethyl triethoxysilane, aminomethyl trimethoxysilane, and γ -methacryloxypropyl trimethoxysilane.

7. The UV ink according to claim 1, wherein the photoinitiator comprises one or more of diphenyl- (2, 4, 6-trimethylbenzoyl) oxy-phosphorus, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin diethyl ether and phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide.

8. The UV ink according to claim 1, further comprising 0.1 to 3 parts by weight of an auxiliary agent, wherein the auxiliary agent comprises one or more of a leveling agent and an antifoaming agent.

9. The rubbing method for the UV ink on the front surface of the camera cover plate is characterized by comprising the following operation steps of:

preparing the UV ink according to any one of claims 1-8, and mixing a prepolymer, a monomer, a pigment, a silane coupling agent, a filler and a photoinitiator according to the raw material ratio to obtain the UV ink;

10. The method of claim 1, wherein the wet etching operation of the camera cover substrate comprises the following steps: