Low-flash-point anti-dazzle cover plate and preparation method thereof

Abstract

The invention belongs to the field of new materials, and particularly relates to a low-flash-point anti-dazzle cover plate and a preparation method thereof. Aiming at the technical problems in the prior art, the invention provides the low-flash-point anti-dazzle cover plate and the preparation method thereof, and the preparation method comprises the following steps: (1) pre-cleaning: cleaning the surface of a base material; (2) anti-dazzle treatment: forming a tiny rough structure on one surface of the base material through a chemical etching, sand blasting or anti-dazzle coating method; (3) preparation of a low-flash-point coating: mixing 60-70 parts by weight of resin, 20-30 parts by weight of a monomer, 5-10 parts by weight of a light diffusion agent, 3-5 parts by weight of an initiator and 0-10 parts by weight of a solvent (when the solvent is 0 part, the coating is a solvent-free system); and (4) coating of a low-flash-point coating: coating the other side of the surface of the base material with the low-flash-point coating through wet coating such as blade coating and printing, and finally carrying out photo-thermal curing. By means of the design of the three-layer structure, the effects of high roughness, high anti-dazzle performance and low flash point are achieved.

Description

Technical Field

[0001] The invention belongs to the field of new materials, and particularly relates to a low-flash point anti-glare cover plate and a preparation method thereof. Background Art

[0002] In order to solve the problem of anti-glare, the display cover will use special surface treatment to form uneven textures. The roughness of the texture surface can be adjusted, so that the light is diffusely reflected on the surface, reducing specular reflection, thereby reducing the impact of screen reflected light on the human eye, improving the readability of the screen at different angles, and reducing eye fatigue. "Sparkle" refers to the uneven surface roughness of the anti-glare treatment on high-resolution displays, which causes light to focus or diverge at certain points, forming a dot pattern of light and dark. These patterns may affect the display effect of the screen, especially when displaying dark or uniform colors. This phenomenon is more common on screens with high pixel density (PPI) because the pixel size is smaller and the irregularities of the anti-glare surface are more easily perceived.

[0003] Low flash point anti-glare sheet can better control the scattering of light and reduce the flash point phenomenon, thus providing a clearer and more uniform display while maintaining the anti-glare effect. This is especially important for high-resolution displays, as they require higher display quality to meet users' requirements for image clarity and details.

[0004] In the manufacturing process of the anti-glare cover plate of the prior art, although the prior art can achieve the enhancement of the anti-glare performance and the improvement of the roughness, or the reduction of the flash point, it can only adjust one of the properties of the cover plate. High roughness (Ra), low sparkle point (sparkle) and low distinctness of image (DOI) are contradictory, that is, low sparkle point (sparkle), low distinctness of image (DOI) and high roughness (Ra) cannot be taken into account at the same time. Summary of the invention

[0005] In view of the technical problems in the prior art, the present invention proposes a low-flash point anti-glare cover plate and a preparation method thereof, and the preparation steps are as follows: (1) Pre-cleaning: cleaning the surface of the substrate; (2) Anti-glare treatment: forming a micro-rough structure on one of the surfaces of the substrate by chemical etching, sandblasting or anti-glare coating; (3) Preparation of low flash point coating: according to weight proportions, 60-70 parts of resin, 20-30 parts of monomer, 5-10 parts of light diffuser, 3-5 parts of initiator and 0-10 parts of solvent are mixed to obtain a coating (0 parts of solvent means a solvent-free system); (4) Low flash point coating: Apply low flash point coating on the other side of the substrate surface by wet coating such as scraping and printing, and finally photothermal curing.

[0006] Preferably, in step (1), the cover substrate is a polymer resin material, including polycarbonate PC, polymethyl methacrylate PMMA and inorganic glass.

[0007] Preferably, in step (2), the chemical etching method uses a fluorine-containing ammonium salt solution as an etching solution, and controls the particle size of the glass surface after etching by adjusting the etching solution concentration and / or the reaction time; the sandblasting method uses compressed air or other power sources to spray abrasives (such as sand, glass beads and steel shots, etc.) onto the surface of the workpiece at a high speed to achieve the purpose of roughening the surface; the anti-glare coating is prepared by coating a layer of anti-glare coating on the surface of the substrate, wherein the anti-glare coating mainly comprises acrylic resin, additives and matting agents, and commercially available products can be selected; after the anti-glare treatment, one side of the cover plate surface has a micron-level concave-convex morphology, the anti-glare texture roughness is greater than 0.15um, the haze H is greater than 30%, and the average size of the concave-convex morphology on the cover plate surface is 20-30um.

[0008] Preferably, in step (3), the resin includes UV type resin and thermosetting resin.

[0009] Furthermore, the UV type resin is one of polyurethane acrylic resin, modified epoxy acrylic resin, polyester acrylic resin or a mixture of any of them, such as CN965, EB245 and 6010; the thermosetting resin is one of isocyanate, epoxy resin, silicone resin, polyurethane or a mixture of any of them, such as 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, isophorone diisocyanate, bisphenol A epoxy resin, and phenolic epoxy resin.

[0010] Preferably, in step (3), the monomer is one of acrylates, modified acrylates, or a mixture of any of them, such as methyl acrylate (MA), n-butyl acrylate (BA), and 2-hydroxyethyl acrylate (HEA).

[0011] Preferably, in step (3), the initiator is a photoinitiator or a thermal curing agent conventionally known in the industry, and the photoinitiator is one or a mixture of any of aromatic ketones, acetophenones, benzoin and its derivatives, such as BP, 184, 1173 produced by CIBA or a mixture thereof; the thermal curing agent is one or more of hexamethylene diisocyanate, isophorone diisocyanate, 2,2'-azobis(2,4-dimethylvaleronitrile) and polyoxyethylene benzoic acid glycidyl ester, such as 3390 and 3300 of Covestro.

[0012] Preferably, in step (3), the light diffusing agent is one of acrylic ester particles or silicone particles or a mixture of the two, with a particle size of 1-10 um, a spherical structure, and a refractive index of 1.49. The acrylic ester particles have functional groups that can react with the main resin for cross-linking.

[0013] Preferably, in step (3), the solvent is one of ethyl acetate, butyl acetate (BA), propylene glycol methyl ether (PM), propylene glycol methyl ether acetate, methyl isobutyl ketone, butanone, toluene, xylene and cyclohexanone, or a mixture of any of them.

[0014] Preferably, the coating thickness in step (4) is 15-30 μm.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The three-layer structure design of the present application achieves matching of large-size textures and small-size particles by separately preparing the anti-glare concave-convex morphology and low-flash point coating on the display cover surface, thereby achieving the effects of high roughness, high anti-glare and low flash point.

[0016] The light diffuser used in the present invention is acrylic ester particles or silicone particles, which are compatible with the main resin, have the same refractive index, are evenly dispersed, and can react and cross-link with the main resin to form a uniform integrated structure, which helps to reduce the flash point. Selecting light diffusers of different particle sizes according to the size of the anti-glare concave-convex morphology particle size helps to reduce the flash point of the display cover.

[0017] The application scheme has simple construction process, wide application range and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the low flash point anti-glare cover DETAILED DESCRIPTION Embodiment 1:

[0019] Select 1.0 mm polycarbonate PC as the cover substrate and clean the surface of the substrate.

[0020] Anti-glare treatment: A layer of anti-glare coating is prepared on the PC surface by an anti-glare coating method. The surface roughness RA of the anti-glare coating is 0.15 and the haze is 40%.

[0021] Preparation of low flash point coating: According to the weight proportions, 20 parts of 1,6-hexanediol diacrylate, 10 parts of polymethyl methacrylate PMMA light diffuser with a particle size of 3 um, 70 parts of difunctional polyurethane acrylate, and 4 parts of 1-hydroxycyclohexyl phenyl ketone are mixed to obtain a low flash point coating glue.

[0022] Low flash point coating: Apply a layer of low flash point coating on the other side of the PC treated in step (2) through a transfer process. Use LED light source for curing, and the curing energy is 1000MJ.

[0023] Embodiment 2: Select 1.0 mm glass as the display cover substrate and clean the surface of the substrate.

[0024] Anti-glare treatment: A concave-convex topography is prepared on the glass surface by chemical etching, and the surface roughness RA of the concave-convex topography is 0.15 and the haze is 40%.

[0025] Preparation of low flash point coating: 10 parts of 1,6-hexanediol diacrylate, 10 parts of polymethyl methacrylate PMMA light diffuser with a particle size of 5um, 70 parts of bisphenol A epoxy resin, 10 parts of butyl acetate, and 5 parts of Covestro 3390 curing agent. After mixing, they are obtained to obtain low flash point coating glue.

[0026] Coating of low flash point coating: Coat a layer of low flash point coating on the other side of the PC treated in step (2) through a printing process. Place in an oven at 200°C and bake for 2 hours. Embodiment 3:

[0027] Select 0.5 mm polymethyl methacrylate PMMA as the cover substrate and clean the surface of the substrate.

[0028] Anti-glare treatment: A layer of anti-glare coating is prepared on the PMMA surface by an anti-glare coating method, and the surface roughness RA of the anti-glare coating is 0.15 and the haze is 40%.

[0029] Preparation of low flash point coating: According to the weight proportions, 30 parts of 1,6-hexanediol diacrylate, 10 parts of silicone light diffuser with a particle size of 5 um, 60 parts of difunctional polyurethane acrylate, and 4 parts of 1-hydroxycyclohexyl phenyl ketone are mixed to obtain a low flash point coating glue.

[0030] Low flash point coating: Apply a layer of low flash point coating on the other side of the PC treated in step (2) through a transfer process. Use LED light source for curing, and the curing energy is 1000MJ.

[0031] Comparative Example 1: (1) Select 1.0 mm thick polycarbonate PC as the cover substrate and clean the surface of the substrate.

[0032] (2) Anti-glare treatment: A layer of anti-glare coating is prepared on the PC surface by coating an anti-glare coating. The roughness RA of the anti-glare coating is 0.15 and the haze is 40%.

[0033] (3) Surface hardening: A layer of ordinary hardening coating is applied on the other side of the anti-glare PC substrate treated in step (2).

[0034] Comparative Example 2: (1) Select 1.0 mm glass as the cover substrate and clean the surface of the substrate.

[0035] (2) Anti-glare treatment: A layer of anti-glare coating is prepared on the glass surface by chemical etching. The roughness RA of the anti-glare coating is 0.15 and the haze is 40%.

[0036] (3) Surface hardening: A layer of ordinary hardening coating is applied on the other side of the anti-glare glass substrate processed in step (2).

[0037] Performance Test: project Test Equipment Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Transmittance Transmittance meter 91 92 91 90 91.6 luster Gloss meter 26 31 20 32 40 Flash point Flash point instrument 3.4 4.4 3.3 8.3 9 DOI DOI meter 45 47 40 73 78 As can be seen from the above, the flash point, DOI and gloss of the embodiment are all lower than those of the control example, and the transmittance does not decrease, which means that the embodiment has a lower flash point and better anti-glare effect without affecting the display effect.

Claims

1. A method for preparing a low flash point anti-glare cover plate, characterized in that The preparation steps are as follows: (1) Pre-cleaning: cleaning the surface of the substrate; (2) Anti-glare treatment: forming a micro-rough structure on one of the surfaces of the substrate by chemical etching, sandblasting or anti-glare coating; (3) Preparation of low flash point coating: according to weight parts, 60-70 parts of resin, 20-30 parts of monomer, 5-10 parts of light diffuser, 3-5 parts of initiator and 0-10 parts of solvent are mixed to obtain a coating; (4) Low flash point coating: Apply low flash point coating on the other side of the substrate surface by wet coating such as scraping and printing, and finally heat and cure.

2. The method for preparing a low flash point anti-glare cover plate according to claim 1, characterized in that: In step (1), the substrate is a polymer resin material, including polycarbonate PC, polymethyl methacrylate PMMA and inorganic glass.

3. The method for preparing a low flash point anti-glare cover plate according to claim 1, characterized in that: In step (2), after anti-glare treatment, one side of the cover plate surface has micron-scale concave-convex morphology, the anti-glare texture roughness is greater than 0.15um, the haze H is greater than 30%, and the average size of the concave-convex morphology on the cover plate surface is 20-30um.

4. The method for preparing a low flash point anti-glare cover plate according to claim 1, characterized in that: In step (3), the resin includes UV type resin and thermosetting resin.

5. The method for preparing a low flash point anti-glare cover plate according to claim 4, characterized in that: The UV type resin is one of polyurethane acrylic resin, modified epoxy acrylic resin, polyester acrylic resin or a mixture of any of them; the thermosetting resin is one of isocyanate, epoxy resin, silicone resin or polyurethane or a mixture of any of them.

6. The method for preparing a low flash point anti-glare cover plate according to claim 1, characterized in that: In step (3), the monomer is one of acrylates and modified acrylates, or a mixture of any two of them.

7. The method for preparing a low flash point anti-glare cover plate according to claim 1, characterized in that: In step (3), the initiator is a photoinitiator or a thermal curing agent; wherein the photoinitiator is one or a mixture of any of aromatic ketones, acetophenones, benzoin and its derivatives, and the thermal curing agent is one or more of hexamethylene diisocyanate, isophorone diisocyanate, 2,2'-azobis(2,4-dimethylvaleronitrile) and polyoxyethylene benzoic acid glycidyl ester.

8. The method for preparing a low flash point anti-glare cover plate according to claim 1, characterized in that: In step (3), the light diffusing agent is one of acrylic ester particles or silicone particles or a mixture of the two, with a particle size of 1-10 μm, a spherical structure, and a refractive index of 1.

49.

9. The method for preparing a low flash point anti-glare cover plate according to claim 1, characterized in that: In step (3), the solvent is one of ethyl acetate, butyl acetate (BA), propylene glycol methyl ether (PM), propylene glycol methyl ether acetate, methyl isobutyl ketone, butanone, toluene, xylene and cyclohexanone, or a mixture of any of them.

10. A low flash point anti-glare cover plate, characterized in that: Obtained by the preparation method according to any one of claims 1 to 9.

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