阅读说明：本技术 一种仿ag玻璃效果的uv涂料及其制备方法与应用 (AG glass effect-imitated UV coating and preparation method and application thereof ) 是由 段伟军 任超 吴真 符饶生 凌云剑 王卫国 杨波 缪培凯 孙能春 于 2020-12-25 设计创作，主要内容包括：本发明公开了一种仿AG玻璃效果的UV涂料及其制备方法与应用,包括以下制备原料：紫外光固化树脂、有机溶剂、陶瓷微珠、聚酰胺蜡和助剂；其中,所述紫外光固化树脂中不含有机硅和不含有机氟；所述助剂中不含有机硅和不含有机氟。该涂料组分中不添加有机硅、有机氟的树脂或助剂,具有抗指纹、耐脏污的效果,涂层固化后,可重新涂覆涂料,不影响内部涂层的附着力,在实际生产使用时,生产的工件如有不良品可再次喷涂、反复利用,减少了原材料的损失,提高了经济效益。(The invention discloses an AG glass effect-imitated UV coating, and a preparation method and application thereof, wherein the AG glass effect-imitated UV coating comprises the following preparation raw materials: ultraviolet light curing resin, organic solvent, ceramic microspheres, polyamide wax and auxiliary agent; wherein the ultraviolet light curing resin does not contain organic silicon and organic fluorine; the assistant does not contain organic silicon and organic fluorine. The coating component does not contain organic silicon and organic fluorine resin or an auxiliary agent, so that the coating has the effects of fingerprint resistance and dirt resistance, after the coating is cured, the coating can be coated again, the adhesive force of an internal coating is not influenced, when the coating is actually produced and used, a produced workpiece can be sprayed again and recycled if a defective product exists, the loss of raw materials is reduced, and the economic benefit is improved.)

1. The UV coating with the AG glass effect is characterized in that: the method comprises the following preparation raw materials: ultraviolet light curing resin, organic solvent, ceramic microspheres, polyamide wax and auxiliary agent;

wherein the ultraviolet light curing resin does not contain organic silicon and organic fluorine;

the assistant does not contain organic silicon and organic fluorine.

2. The AG glass effect-imitating UV paint according to claim 1, wherein: the auxiliary agent comprises a leveling agent, a wetting dispersant and a photoinitiator.

3. The AG glass effect-imitating UV paint according to claim 2, wherein: the material is prepared from the following raw materials in parts by weight: 30-40 parts of ultraviolet curing resin, 20-40 parts of organic solvent, 30-40 parts of ceramic microspheres, 5-10 parts of polyamide wax, 0.2-1 part of flatting agent, 0.2-1 part of wetting dispersant and 1-4 parts of photoinitiator.

4. An AG glass effect-imitating UV coating material as claimed in any one of claims 1 to 3, wherein: the ultraviolet light curing resin is at least one of polyurethane acrylate copolymer and nano modified polyurethane acrylate copolymer; the organic solvent is at least one of ethyl acetate, butyl acetate and acetone.

5. An AG glass effect-imitating UV coating material as claimed in claim 2 or 3, wherein: the photoinitiator is at least one of 1-hydroxycyclohexyl phenyl ketone and 2-hydroxy-2-methyl-1-phenyl-1-acetone; the flatting agent is polyacrylate flatting agent.

6. An AG glass effect-imitating UV coating material as claimed in any one of claims 1 to 3, wherein: the auxiliary agent also comprises a reactive monomer; preferably, the content of said reactive monomer does not exceed 10%; more preferably, the reactive monomer is at least one of pentaerythritol triacrylate and dipentaerythritol hexaacrylate.

7. A method for preparing the AG glass effect imitating UV paint as claimed in any one of claims 2 to 6, wherein: comprises the following steps:

s1, dissolving:

uniformly mixing a photoinitiator and an organic solvent to obtain a photoinitiator solution;

adding ultraviolet curing resin and other additives into a photoinitiator solution, and dispersing to obtain a pre-dispersion liquid;

s2, grinding:

dispersing and adding the ceramic microspheres into the pre-dispersion liquid, dispersing for the second time, and grinding to obtain grinding liquid;

s3, preparation:

and adding polyamide wax into the grinding liquid, and dispersing to obtain the AG glass effect-imitating UV coating.

8. Use of a coating according to any one of claims 1 to 7 for the preparation of an anti-glare coating.

9. The anti-glare coating of claim 8 on a back cover of a cell phone.

10. The method for preparing the anti-glare coating layer according to claim 8 or 9, comprising the steps of:

s1, dilution: adding the coating into a diluent to obtain a diluent;

s2, curing: and coating the diluent on the surface of an object, drying and carrying out UV curing.

Technical Field

The invention belongs to the field of coatings, and particularly relates to an AG glass effect-imitating UV coating, and a preparation method and application thereof.

Background

The AG glass is characterized in that the surface of the glass is specially treated, so that the surface of the glass is changed from a smooth surface to a rough surface, the specular reflection of the glass is converted into diffuse reflection, light is prevented from directly entering eyes, and the eyes of people are protected. In recent years, a mobile phone manufacturer has a plurality of mobile phone rear covers made of AG glass, so that the mobile phone rear covers have an anti-dazzle effect. However, the AG glass has complex manufacturing process and multiple working procedures, and the AG glass itself has high cost, is fragile, and has low yield, so that the rear cover of the AG glass mobile phone is expensive. In order to reduce the production cost, the anti-dazzle effect is realized by spraying the AG glass effect-imitating UV coating transparent plastic on the rear cover of the mobile phone.

In order to achieve the anti-glare effect, the anti-glare effect pattern may be added and particles may be added. In the related technology, the ultraviolet curing coating is coated on the surface of the transparent substrate to obtain a coating, after the coating is heated and dried, the pattern with the anti-glare effect is transferred to the surface of the coating, and simultaneously, the ultraviolet curing is carried out, so that the coating with the AG glass effect is obtained. But the preparation process of the coating is complex and the production efficiency is low; meanwhile, the anti-dazzle effect is actually realized through anti-dazzle patterns and is not the effect of the coating.

The anti-dazzle effect is realized by adding the anti-dazzle particles, the uniformity of the prepared coating is poor and unstable due to serious particle agglomeration phenomenon and difficult dispersion, and the anti-dazzle effect of the obtained coating is influenced. Meanwhile, the particles are wide in particle size distribution and not easy to disperse, and cannot be directly added into the coating, otherwise, the appearance of the coating, such as haze, roughness, definition and the like, is influenced, the appearance is rough, the haze is low, the anti-dazzle effect is poor, and the coating is not suitable for the mobile phone rear cover with fine and smooth appearance requirement and high haze. In order to improve the particle sedimentation problem, the anti-sedimentation and anti-flocculation auxiliary agent is added in the related technology to solve the particle sedimentation problem in the production process, but the sedimentation and flocculation of the anti-glare particles caused by the storage and transportation processes of the coating are ignored; after long-term storage and transportation, the flocculation of the anti-glare particles can seriously affect the anti-glare effect of the coating.

In order to reduce the cost, the related technology prepares the baking curing type coating by adding the hardening catalyst, reduces the baking temperature, still needs to bake for at least 30min at 50-120 ℃, and the process has high production energy consumption and low efficiency. And the catalyst can generate hydrogen and ammonia gas in the hardening process, so that serious potential safety hazards exist, and the safety production of enterprises is not facilitated. And after the catalyst is formed into a film, the paint film is very brittle and has no flexibility, and the paint film has certain bending requirements on the rear cover of the mobile phone, so that the paint is not suitable for the rear cover of the mobile phone.

The back cover of the mobile phone is continuously contacted by fingers, and grease, sweat and dust in the air on the fingers are easily stained on the back cover, so that the attractiveness of the back cover is affected. In order to achieve the anti-fouling effect, in the related technology, the organic silicon auxiliary agent is added into the ultraviolet curing resin, so that the surface tension of the coating is obviously reduced, and the water contact angle is increased, thereby achieving the anti-fouling effect; but the surface tension of the coating is low, so that the coating cannot be wetted on the surface of the coating and cannot be recoated and attached on the surface; in the actual production process, the coating plant can have the film defects such as large particles or shrinkage cavities because of the reasons such as construction environment, process and the like, so that defective products appear on the product, if the coating cannot be recoated and attached, the defective products cannot be reworked when the defective products appear, the defective products can only be scrapped, and raw materials are wasted, thereby indirectly increasing the production cost.

Therefore, it is required to prepare an AG glass effect-imitated UV coating, which is sprayed on a transparent plastic mobile phone rear cover substrate, so that the transparent plastic mobile phone rear cover has an AG glass anti-glare effect and the substrate surface has an anti-fouling performance.

Disclosure of Invention

The first technical problem to be solved by the invention is as follows: an AG glass effect-imitating UV coating which is repairable, stain-resistant and abrasion-resistant.

The second technical problem to be solved by the invention is as follows: a preparation method of UV coating with AG glass effect.

The third technical problem to be solved by the invention is as follows: an application of UV paint with AG glass effect.

In order to solve the first technical problem, the invention provides the following technical scheme: an AG glass effect-imitated UV coating comprises the following preparation raw materials: ultraviolet light curing resin, organic solvent, ceramic microspheres, polyamide wax and auxiliary agent;

wherein the ultraviolet light curing resin does not contain organic silicon and organic fluorine;

the assistant does not contain organic silicon and organic fluorine.

The ceramic microspheres are fine spherical particles, and can form an uneven surface on the surface of the coating, so that the coating has the anti-dazzle effect and frosted hand feeling of AG glass; meanwhile, the ceramic microspheres have low porosity and stain resistance, so that the coating has the stain resistance; in addition, the ceramic microspheres have the characteristics of high strength, high hardness, inertia and the like, and the hardness, the wear resistance and the chemical resistance of the coating are improved; by reducing the volume shrinkage of the coating in the curing process, the shrinkage stress of the coating is reduced, and the adhesive force and the recoatability of the coating are improved.

The polyamide wax is a thixotropic additive, forms a network structure in the coating, and has excellent thixotropic property, sagging resistance and sedimentation resistance; can effectively prevent the agglomeration and sedimentation of ceramic microspheres in the coating, and ensure the uniformity and storage stability of the coating.

According to some embodiments of the invention, the auxiliary agent comprises a leveling agent, a wetting dispersant and a photoinitiator.

According to some embodiments of the invention, the AG glass effect-imitating UV coating is prepared from the following raw materials in parts by weight:

30-40 parts of ultraviolet curing resin;

20-40 parts of an organic solvent;

30-40 parts of ceramic microspheres;

5-10 parts of polyamide wax;

0.2-1 part of a leveling agent;

0.2-1 part of wetting dispersant;

1-4 parts of a photoinitiator.

According to some embodiments of the present invention, the uv curable resin is at least one of a urethane acrylate copolymer and a nano-modified urethane acrylate copolymer.

The ultraviolet curing coating is heated at 50-60 ℃ for about 5min, so that a film can be formed by ultraviolet curing, the production efficiency is higher, and the energy consumption is lower; the flexibility of the paint film can be adjusted by different ultraviolet curing resins.

According to some embodiments of the invention, the organic solvent is at least one of ethyl acetate, butyl acetate and acetone.

According to some embodiments of the invention, the adjuvant further comprises a reactive monomer.

According to some embodiments of the invention, preferably, the reactive monomer content is no more than 10%.

According to some embodiments of the invention, the reactive monomer is at least one of pentaerythritol triacrylate and dipentaerythritol hexaacrylate.

According to some embodiments of the invention, the leveling agent is a polyacrylate leveling agent.

The polyacrylate flatting agent does not affect the interlayer adhesion.

According to some embodiments of the invention, the photoinitiator is at least one of 1-hydroxycyclohexyl phenyl ketone and 2-hydroxy-2-methyl-1-phenyl-1-propanone.

The AG glass effect-imitating UV coating provided by the embodiment of the invention has at least the following beneficial effects: the coating prepared by the invention uses resin or an auxiliary agent without adding organic silicon and organic fluorine, has the effects of fingerprint resistance and dirt resistance, can be recoated after the coating is cured, does not influence the adhesive force of the internal coating, can be sprayed again and recycled when in actual production and use if a produced workpiece has a defective product, reduces the loss of raw materials, and improves the economic benefit. The ceramic beads used in the coating have low porosity and good stain resistance, and can ensure the stain resistance of the coating without influencing the repainting property of the coating; the strength is good, the hardness is high, and the hardness and the wear resistance of the coating are greatly improved; in addition, the ceramic microspheres have small oil absorption, low viscosity and large specific gravity, can reduce the use of Volatile Organic Compounds (VOC) of the coating, and meet the requirement of environmental protection. The polyamide wax used in the paint is a thixotropic additive, forms a network structure in the paint, and has excellent thixotropic property, sagging resistance and sedimentation resistance; effectively prevents the agglomeration and sedimentation of ceramic microspheres in the coating and ensures the uniformity and storage stability of the coating. The coating has the characteristics of anti-glare, fingerprint resistance, dirt resistance, scratch resistance and high wear resistance; the adhesive has good adhesive force to various plastic substrates (substrates such as PC, ABS, PC + ABS and the like), is used for protecting various plastic substrates and increasing the wear resistance and the chemical resistance of the plastic substrates; the mobile phone has frosted hand feeling, plays a role in skid resistance and can prevent the mobile phone from slipping off.

In order to solve the second technical problem, the invention provides the following technical scheme: a method for preparing the AG glass effect imitating UV coating comprises the following steps:

s1, dissolving:

uniformly mixing a photoinitiator and an organic solvent to obtain a photoinitiator solution;

adding ultraviolet curing resin and other additives into a photoinitiator solution, and dispersing to obtain a pre-dispersion liquid;

s2, grinding:

dispersing and adding the ceramic microspheres into the pre-dispersion liquid, dispersing for the second time, and grinding to obtain grinding liquid;

s3, preparation:

and adding polyamide wax into the grinding liquid, and dispersing to obtain the AG glass effect-imitating UV coating.

According to some embodiments of the present invention, the dispersion rotation speed in step S1 is 1200-1500 r/min.

According to some embodiments of the present invention, the dispersion time in the step S1 is 20-30 min.

According to some embodiments of the present invention, the second dispersing rotation speed in step S2 is 1200-1500 r/min.

According to some embodiments of the present invention, the second dispersing time in the step S2 is 20-30 min.

According to some embodiments of the present invention, the fineness after grinding in the step S2 is 2 μm or less.

According to some embodiments of the present invention, the dispersion rotation speed in step S3 is 1200-1500 r/min.

According to some embodiments of the present invention, the dispersion time in step S3 is 20-30 min.

In order to solve the third technical problem, the technical solution provided by the present invention is: the application of the coating in the technical scheme in the preparation of the anti-glare coating; preferably, the anti-glare coating is located on the back cover of the mobile phone.

The present invention also provides a method for preparing an anti-glare coating using the AG glass effect-imitating UV coating described above, according to some embodiments of the present invention.

According to some embodiments of the present invention, the method for preparing the anti-glare coating comprises the steps of:

s1, dilution: adding the coating into a diluent to obtain a diluent;

s2, curing: and coating the diluent on the surface of an object, drying and carrying out UV curing.

According to some embodiments of the invention, the diluent comprises the following components: ethyl acetate; butyl acetate; ethanol; diisobutyl ketone.

According to some embodiments of the invention, the diluent consists of the following parts by weight of the raw materials: 30 parts of ethyl acetate; 20 parts of butyl acetate; 20 parts of ethanol; and 30 parts of diisobutyl ketone.

According to some embodiments of the invention, the weight ratio of the coating to the diluent is about 100: 80.

According to some embodiments of the invention, the drying temperature is 50-60 ℃, and the drying time is 5-6 min.

The construction process is simple, after the coating is sprayed for one time, the coating is heated for about 5min through a drying tunnel at the temperature of 50-60 ℃, and is cured by an ultraviolet curing machine, so that the coating with the AG glass effect can be obtained; compared with the related process, the transfer printing process is reduced, the anti-dazzle patterns are saved on the raw materials, and the process and the cost are optimized.

The preparation method of the AG glass effect-imitating UV coating has at least the following beneficial effects: the preparation method has the advantages of low drying temperature, short drying time, low production energy consumption and high production efficiency; the method is simple and convenient to operate and beneficial to enterprise production.

The application of the AG glass effect imitating UV coating according to the embodiment of the invention has at least the following beneficial effects: the coating is used for the rear cover of the plastic mobile phone, protects the rear cover of the mobile phone, increases the wear resistance of the rear cover of the plastic mobile phone, enables the rear cover of the plastic mobile phone to have frosted hand feeling and anti-dazzle effect of AG glass, enables the rear cover of the mobile phone to have anti-fouling performance, simplifies the production process of the rear cover of the mobile phone, improves the production efficiency, improves the product yield and reduces the material consumption.

Detailed Description

In order to explain the technical content, the objects and the effects of the present invention in detail, the following description will be given with reference to the embodiments. The test methods used in the examples are all conventional methods unless otherwise specified; the materials, reagents and the like used are commercially available reagents and materials unless otherwise specified.

The first embodiment of the invention is as follows: the UV coating with the AG glass effect is prepared from the following raw materials in parts by weight:

2 parts of photoinitiator (Irgacure 184);

15 parts of ethyl acetate;

15 parts of butyl acetate;

40 parts of ultraviolet curing resin (Changxing chemical 61967);

0.5 part of a leveling agent (BYK 358N);

0.5 part of wetting dispersant (EFKA 4010);

30 parts of ceramic microspheres (3M W210);

6 parts of polyamide wax (Disibulone 6900-HV).

The preparation method of the UV coating comprises the following steps:

s1, sequentially adding a photoinitiator, ethyl acetate, butyl acetate, ultraviolet curing resin, a leveling agent and a wetting dispersant in parts by weight, and dispersing for 20min at the speed of 1200-1500 r/min to obtain a pre-dispersion liquid;

s2, adding the ceramic microspheres into the pre-dispersion liquid while dispersing, dispersing for 30min at 1200-1500 r/min, and grinding until the fineness is less than 2 μm (detected by a scraper fineness gauge) to obtain a grinding liquid;

s3, adding the polyamide wax into the grinding liquid, and dispersing for 30min at the speed of 1200-1500 r/min to obtain the AG glass effect-imitating UV coating.

The second embodiment of the invention is as follows: the UV coating with the AG glass effect is prepared from the following raw materials in parts by weight:

2 parts of photoinitiator (Irgacure 184);

15 parts of ethyl acetate;

15 parts of butyl acetate;

40 parts of ultraviolet curing resin (Changxing chemical 61992);

0.5 part of a leveling agent (BYK 358N);

0.5 part of wetting dispersant (EFKA 4010);

40 parts of ceramic microspheres (3M W210);

8 parts of polyamide wax (Disiburon 6900-HV).

The preparation method of the UV coating comprises the following steps:

s1: sequentially adding a photoinitiator, ethyl acetate, butyl acetate, ultraviolet curing resin, a leveling agent and a wetting dispersant according to the weight parts, and dispersing for 20min at the speed of 1200-1500 r/min to obtain a pre-dispersion liquid;

s2: adding ceramic microspheres into the pre-dispersion liquid while dispersing, dispersing for 30min at 1200-1500 r/min, and grinding to a fineness of less than 2 μm (detected by a scraper fineness gauge) to obtain a grinding liquid;

s3: and adding polyamide wax into the grinding fluid, and dispersing for 30min at the speed of 1200-1500 r/min to obtain the AG glass effect-imitating UV coating.

The third embodiment of the invention is as follows: the UV coating with the AG glass effect is prepared from the following raw materials in parts by weight:

2 parts of photoinitiator (Irgacure 184);

15 parts of ethyl acetate;

15 parts of butyl acetate;

35 parts of ultraviolet curing resin (Changxing chemical 6196-100);

5 parts of a reactive monomer (dipentaerythritol hexaacrylate);

0.5 part of a leveling agent (BYK 358N);

0.5 part of wetting dispersant (EFKA 4010);

40 parts of ceramic microspheres (3M W210);

8 parts of polyamide wax (Disiburon 6900-HV).

The preparation method of the UV coating comprises the following steps:

s1: sequentially adding a photoinitiator, ethyl acetate, butyl acetate, ultraviolet curing resin, an active monomer, a leveling agent and a wetting dispersant in parts by weight, and dispersing for 20min at the speed of 1200-1500 r/min to obtain a pre-dispersion liquid;

s2: adding ceramic microspheres into the pre-dispersion liquid while dispersing, dispersing for 30min at 1200-1500 r/min, and grinding to a fineness of less than 2 μm (detected by a scraper fineness gauge) to obtain a grinding liquid;

s3: and adding polyamide wax into the grinding fluid, and dispersing for 30min at the speed of 1200-1500 r/min to obtain the AG glass effect-imitating UV coating.

The first comparative example of the present invention is: the UV coating is prepared from the following raw materials in parts by weight:

2 parts of photoinitiator (Irgacure 184);

15 parts of ethyl acetate;

15 parts of butyl acetate;

35 parts of ultraviolet curing resin (Changxing chemical 6196-100);

5 parts of a reactive monomer (dipentaerythritol hexaacrylate);

0.5 part of a leveling agent (BYK 358N);

0.5 part of wetting dispersant (EFKA 4010);

8 parts of polyamide wax (Disiburon 6900-HV).

The preparation method of the UV coating comprises the following steps:

s1: sequentially adding a photoinitiator, ethyl acetate, butyl acetate, ultraviolet curing resin, an active monomer, a leveling agent and a wetting dispersant in parts by weight, and dispersing for 20min at the speed of 1200-1500 r/min to obtain a pre-dispersion liquid;

s2: and adding polyamide wax into the pre-dispersion liquid, and dispersing for 30min at the speed of 1200-1500 r/min to obtain the AG glass effect-imitated UV coating.

The second comparative example of the present invention is: the UV coating is prepared from the following raw materials in parts by weight:

2 parts of photoinitiator (Irgacure 184);

15 parts of ethyl acetate;

15 parts of butyl acetate;

35 parts of ultraviolet curing resin (Changxing chemical 6196-100);

5 parts of a reactive monomer (dipentaerythritol hexaacrylate);

0.5 part of a leveling agent (BYK 358N);

0.5 part of wetting dispersant (EFKA 4010);

40 parts of ceramic microspheres (3M W210);

8 parts of polyamide wax (Disiburon 6900-HV).

The preparation method of the UV coating comprises the following steps:

s1: sequentially adding a photoinitiator, ethyl acetate, butyl acetate, ultraviolet curing resin, an active monomer, a leveling agent and a wetting dispersant in parts by weight, and dispersing for 20min at the speed of 1200-1500 r/min to obtain a pre-dispersion liquid;

s2: adding the ceramic microspheres into the pre-dispersion liquid while dispersing, and dispersing for 30min at the speed of 1200-1500 r/min to obtain a dispersion liquid;

s3: and adding polyamide wax into the dispersion liquid, and dispersing for 30min at the speed of 1200-1500 r/min to obtain the AG glass effect-imitating UV coating.

The third comparative example of the present invention is: the UV coating is prepared from the following raw materials in parts by weight:

2 parts of photoinitiator (Irgacure 184);

15 parts of ethyl acetate;

15 parts of butyl acetate;

35 parts of ultraviolet curing resin (Changxing chemical 6196-100);

5 parts of a reactive monomer (dipentaerythritol hexaacrylate);

0.5 part of a leveling agent (BYK 358N);

0.5 part of wetting dispersant (EFKA 4010);

40 parts of ceramic microspheres (3M W210).

The preparation method of the UV coating comprises the following steps:

s1: sequentially adding a photoinitiator, ethyl acetate, butyl acetate, ultraviolet curing resin, an active monomer, a leveling agent and a wetting dispersant in parts by weight, and dispersing for 20min at the speed of 1200-1500 r/min to obtain a pre-dispersion liquid;

s2: and adding the ceramic microspheres into the pre-dispersion liquid while dispersing, dispersing for 30min at 1200-1500 r/min, and grinding until the fineness is less than 2 mu m (detected by a scraper fineness gauge) to obtain the grinding liquid.

Comparative example three was stored at room temperature for 30 days before performance testing.

Comparative example four of the present invention is: the UV coating with the AG glass effect is prepared from the following raw materials in parts by weight:

2 parts of photoinitiator (Irgacure 184);

15 parts of ethyl acetate;

15 parts of butyl acetate;

40 parts of ultraviolet curing resin (Zhongshanjieda fine chemical DSP-552F (organic fluororesin));

0.5 part of a leveling agent (BYK 358N);

0.5 part of wetting dispersant (EFKA 4010);

30 parts of ceramic microspheres (3M W210);

6 parts of polyamide wax (Disibulone 6900-HV).

The preparation method of the UV coating comprises the following steps:

s1, sequentially adding a photoinitiator, ethyl acetate, butyl acetate, ultraviolet curing resin, a leveling agent and a wetting dispersant in parts by weight, and dispersing for 20min at the speed of 1200-1500 r/min to obtain a pre-dispersion liquid;

s2, adding the ceramic microspheres into the pre-dispersion liquid while dispersing, dispersing for 30min at 1200-1500 r/min, and grinding until the fineness is less than 2 μm (detected by a scraper fineness gauge) to obtain a grinding liquid;

s3, adding the polyamide wax into the grinding liquid, and dispersing for 30min at the speed of 1200-1500 r/min to obtain the AG glass effect-imitating UV coating.

The fifth comparative example of the present invention is: the UV coating with the AG glass effect is prepared from the following raw materials in parts by weight:

2 parts of photoinitiator (Irgacure 184);

15 parts of ethyl acetate;

15 parts of butyl acetate;

40 parts of ultraviolet curing resin (Changxing chemical 61967);

0.5 part of leveling agent (BYK 333);

0.5 part of wetting dispersant (EFKA 4010);

30 parts of ceramic microspheres (3M W210);

6 parts of polyamide wax (Disibulone 6900-HV).

The preparation method of the UV coating comprises the following steps:

s1, sequentially adding a photoinitiator, ethyl acetate, butyl acetate, ultraviolet curing resin, a leveling agent and a wetting dispersant in parts by weight, and dispersing for 20min at the speed of 1200-1500 r/min to obtain a pre-dispersion liquid;

s2, adding the ceramic microspheres into the pre-dispersion liquid while dispersing, dispersing for 30min at 1200-1500 r/min, and grinding until the fineness is less than 2 μm (detected by a scraper fineness gauge) to obtain a grinding liquid;

s3, adding the polyamide wax into the grinding liquid, and dispersing for 30min at the speed of 1200-1500 r/min to obtain the AG glass effect-imitating UV coating.

The coatings prepared in the first to third embodiments and the first to fifth embodiments of the present invention are applied to the preparation of the anti-glare coating, and comprise the following steps:

s1, dilution: adding the prepared coating into a diluent to obtain a diluent; wherein the diluent consists of the following raw materials in parts by weight: 30 parts of ethyl acetate; 20 parts of butyl acetate; 20 parts of ethanol; 30 parts of diisobutyl ketone; the weight ratio of coating to diluent was 100: 80.

S2, curing: and coating the diluent on the surface of an object, drying and carrying out UV curing to obtain the anti-glare coating.

The performance test method of the embodiment of the invention comprises the following steps:

1. 0000# Steel wool abrasion resistance test: a steel wool abrasion tester 0000# steel wool has the load of 1000g, the stroke of 30mm, the speed of 40 times/minute, and the number of times is recorded when a paint film has traces.

2. Adhesion force: the adhesion test was performed according to the method specified in GB/T9826, 100/100 being 10 × 10 cells scribed on the coating, after which 100 cells had no coating falling off.

3. Re-coating adhesive force: after the coating is cured, spraying the coating again on the surface of the coating and curing, and completing the adhesion test.

4. Haze and light transmittance: measured with a WGT-S light transmittance haze meter of Shanghai Instrument precision Ltd.

5. Stain resistance: and (2) using a ZEBRA oily pen (model: MO-120-MC, thin-head test), drawing 5 handwriting with 5-10 mm at a constant speed on the surface of the coating by applying 1-2N force, standing at normal temperature for 10min, wiping the surface with alcohol (the concentration is more than or equal to 99.5%), and leaving no trace residue after wiping.

The results of the performance tests of examples one to three of the present invention and comparative examples one to five are shown in Table 1.

Table 1 results of performance testing of examples one to three and comparative examples one to five

The first comparative example, in which no ceramic bead was added, was found from the data in table 1, and the wear resistance of the first comparative example was only 500 times, which was much lower than that of the first to third examples; the haze was only 5%, much lower than examples one to three (65% or more). Therefore, the addition of the ceramic microspheres greatly improves the wear resistance and the anti-glare effect of the coating.

Comparative example two, which was not ground after the addition of the ceramic beads was completed, had a lower haze (13%) and transmittance (41%) than examples one to three (haze 65% or more and transmittance 75% or more), as can be seen from the data in table 1. It is known that the grinding process improves the antiglare effect of the coating.

Comparative example three No polyamide wax was added, and as can be seen from the data in Table 1, the haze (30%) and light transmittance (48%) of comparative example two were lower than those of examples one to three (haze 65% or more, light transmittance 75% or more). It is known from this that polyamide waxes improve the storage stability of the coating.

Comparative example four using an organic fluororesin as a host resin, it can be seen from the data of table 1 that comparative example four has a recoat adhesion of 0/100, which is much lower than examples one to three. It is known that the organic fluorine resin seriously affects the recoatability of the coating layer.

Comparative example five using a silicone-based leveling agent, it is found from the data of table 1 that the recoat adhesion of comparative example five is 60/100, which is lower than that of examples one to three. It is known that silicone leveling aids can affect the refinish properties of coatings.

In conclusion, the UV coating provided by the invention has the advantages that the coating has an anti-dazzle effect and is resistant to pollution by utilizing the extremely low porosity of the ceramic microspheres and matching with common UV resin; and the coating does not influence the recoating adhesion of the coating, can reduce loss, improve the yield of products and improve economic benefits. In the preparation process of the coating, the coating containing the ceramic microspheres is ground, so that the particle size distribution of the ceramic microspheres is narrower and finer, and the polyamide wax is added to prevent the ceramic microspheres from agglomerating, so that the coating has good haze and roughness and a better anti-glare effect. And because the ceramic microspheres have high hardness and very good wear resistance, the wear resistance of the coating can be improved by adding the ceramic microspheres into the coating, and the wear resistance of the mobile phone rear cover can be obviously improved when the ceramic microspheres are used for the mobile phone rear cover.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention in the specification or directly or indirectly applied to the related technical field are included in the scope of the present invention.