Low-haze anti-dazzle resin cover plate and preparation method thereof

Abstract

The invention discloses a low-haze anti-dazzle resin cover plate which comprises a plastic base body and a low-haze anti-dazzle coating, the plastic base body is coated with the low-haze anti-dazzle coating, the thickness of the plastic base body ranges from 0.05 mm to 6 mm, and the thickness of the low-haze anti-dazzle coating ranges from 5 micrometers to 20 micrometers. The plastic base layer is made of PET, PC, PMMA, a PC / PMMA composite material or PETG. The low-haze anti-dazzle coating mainly comprises the following components: two-functionality acrylic ester, three-functionality acrylic ester, six-functionality urethane acrylate, two-functionality urethane acrylate, a photoinitiator and a flatting agent. In order to solve the technical problems in the prior art, the low-haze anti-dazzle resin cover is prepared through phase separation of a crystalline component and an amorphous component of a coating. The low-haze anti-dazzle resin cover plate prepared by the invention has the characteristics of low haze, high definition and the like, and the scheme of the invention is simple in construction process, low in cost and good in coating uniformity.

Description

Technical Field

[0001] The invention relates to the technical field of optical resin cover plates, and in particular to a low-fog anti-glare resin cover plate and a preparation method thereof. Background Art

[0002] Traditional touch cover plates are made of glass, but they have many defects, such as easy breakage and heavy weight. Resin cover plates are made of plastic substrates such as polycarbonate PC and polymethyl methacrylate PMMA, and have the characteristics of good optical properties and light weight. Resin cover plates used in the field of optical display are often made of plastics such as polycarbonate PC and polymethyl methacrylate PMMA as substrates, and light-curing resin is coated on the surface for hardening to improve the wear resistance and printing performance of the resin cover plates. External light sources can cause glare on the display screen, thereby affecting the display effect. The existing technology to solve glare is to add an anti-glare film to the display. The commonly used anti-glare films on the market mainly achieve anti-glare by adding matte powder or embossing a concave-convex structure to produce a concave-convex structure on the surface of the hardened layer. However, matte powder is easy to settle, resulting in uneven distribution of product haze, high printing cost, and low efficiency. Therefore, the existing technology is in urgent need of improvement.

[0003] Coating phase separation refers to the situation in which the different components of the coating material are not compatible with each other, resulting in the separation of the different material components that were originally mixed together during the drying or curing process of the coating to form different phases. In the preparation process of anti-glare coating, coating phase separation may occur in the following situations: 1. Phase separation caused by solvent volatilization: During the drying process of the coating, the volatilization of the solvent may cause the solubility of different components to change, thus causing phase separation.

[0004] 2. Phase separation caused by temperature changes: During the coating curing process, temperature changes may affect the compatibility of the materials, causing the originally evenly mixed components to begin to separate.

[0005] 3. Phase separation caused by reactions: If the coating material contains ingredients that undergo chemical reactions, these reactions may produce new incompatible components, resulting in phase separation.

[0006] The present invention realizes anti-glare property by adding easily crystallizable substances into the coating to realize phase separation of crystalline state and amorphous state during curing and cross-linking. Summary of the invention

[0007] In view of the technical problems in the prior art, the present invention proposes a low-fog anti-glare resin cover plate and a preparation method thereof. The anti-glare resin cover plate of the present invention has the characteristics of low haze, high definition and good coating uniformity, and at the same time, the construction process is simple, the cost is low and the efficiency is high.

[0008] The technical solution provided by the present invention is: A low-fog anti-glare resin cover plate comprises a plastic substrate and a low-fog anti-glare coating, wherein the low-fog anti-glare coating is coated on the plastic substrate, the thickness of the plastic substrate is 0.05 mm to 6 mm, and the thickness of the low-fog anti-glare coating is 5 to 20 μm.

[0009] The low-fog anti-glare resin cover plate as described above, wherein the plastic base layer is any one of PET, PC, PMMA, PC / PMMA composite material and PETG. In the present invention, PET (English name: Polyethyleneterephthalate, referred to as PET) is a polyethylene terephthalate plastic; PC (English name: Polycarbonate, referred to as PC) is polycarbonate; PMMA (English name: Polymethyl Methacrylate, referred to as PMMA) is polymethyl methacrylate; PETG (English name: Poly(ethyleneterephthalateco-1,4-cylclohexylenedimethyleneterephthalate), referred to as PETG) is a transparent, non-crystalline copolyester.

[0010] The low-fog anti-glare resin cover plate as described above, wherein the low-fog anti-glare coating comprises the following components: difunctional acrylate, trifunctional acrylate, hexafunctional polyurethane acrylate, difunctional polyurethane acrylate, photoinitiator, leveling agent and mixed solvent, and the weight proportions of each component are respectively: 5-10 parts of difunctional acrylate; 10-20 parts of trifunctional acrylate; 20-40 parts of hexafunctional polyurethane acrylate; 5-20 parts of difunctional polyurethane acrylate; 1 to 5 parts of photoinitiator; Leveling agent 0-1 part 40~60 parts of mixed solvent.

[0011] The difunctional acrylate, trifunctional acrylate and hexafunctional polyurethane acrylate are the main components of the UV curable resin and are mainly used to achieve the functions of coating adhesion to the substrate, wear resistance and hardness.

[0012] The difunctional polyurethane acrylate has high crystallinity and is in a crystalline state after being cured and cross-linked, thus playing an anti-glare role in the coating.

[0013] The photoinitiator is mainly used for initiating double bond free radical polymerization of acrylate under UV light of difunctional acrylate, trifunctional acrylate, hexafunctional polyurethane acrylate and difunctional polyurethane acrylate to form a network-like cross-linked polymer chain morphology.

[0014] The leveling agent is an additive, which is often used for the self-leveling effect of the coating surface and can adjust the surface energy of the material.

[0015] The present invention also provides a method for preparing a low-fog anti-glare resin cover plate, comprising the following steps: (1) Preparation of low haze anti-glare coating: difunctional acrylate, trifunctional acrylate, hexafunctional polyurethane acrylate, polyurethane acrylate, photoinitiator and leveling agent are mixed according to certain weight proportions, and diluted with a mixed solvent; (2) Coating and drying the low-haze anti-glare coating: coating the low-haze anti-glare coating of step (1) on the surface of the plastic base layer, controlling the coating thickness to a certain level, and then drying the solvent; (3) UV curing of the low haze anti-glare coating: The low haze anti-glare coating after drying in step (2) is subjected to UV curing to form a low haze anti-glare coating.

[0016] Preferably, in step (1), the weight proportions of the components are: 5-10 parts of difunctional acrylate; 10-20 parts of trifunctional acrylate; 20-40 parts of hexafunctional polyurethane acrylate; 5-20 parts of difunctional polyurethane acrylate; 1-5 parts of photoinitiator; 0-1 parts of leveling agent; and 40-60 parts of mixed solvent.

[0017] Preferably, the difunctional acrylate in step (1) is any one of 1,6-hexanediol diacrylate HDDA, tripropylene glycol diacrylate TPGDA, and 2-hydroxy-3-propyl methacrylate.

[0018] Preferably, the trifunctional acrylate in step (1) is any one of trimethylolpropane triacrylate TMPTA and trimethylolpropane triacrylate TMPTMA.

[0019] Preferably, the hexafunctional polyurethane acrylate described in step (1) includes hexafunctional aliphatic polyurethane acrylate polymer and hexafunctional aromatic polyurethane acrylate polymer. The present invention has no particular restriction on the source of the polyurethane acrylate polymer with a functionality of hexafunctionality or higher, and the polyurethane acrylate polymer with a functionality of hexafunctionality or higher that is well known to those skilled in the art can be used, such as commercially available products. In the present invention, the preferred brand used is any one of LE6706, RU-8090 and RU-637B.

[0020] Preferably, the difunctional polyurethane acrylate in step (1) is an easily crystallized aromatic polyurethane acrylate, and the brand is any one of CN 972, CN 999, EB 210 and 6572.

[0021] Preferably, the mixed solvent described in step (1) is one or more of ethyl acetate, butyl acetate (BA), propylene glycol methyl ether (PM), propylene glycol methyl ether acetate, methyl isobutyl ketone, butanone, toluene, xylene and cyclohexanone, and more preferably includes one or more of ethyl acetate, butyl acetate, propylene glycol methyl ether acetate and propylene glycol methyl ether.

[0022] Preferably, the photoinitiator in step (1) is one or more of 1-hydroxycyclohexyl phenyl ketone (184), 2-hydroxy-methylphenylpropane-1-one (1173), 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone (907), benzoin dimethyl ether, xylene ketone, 2-isopropylthioxanthone and 2,4,6 (trimethylbenzoyl) diphenylphosphine oxide.

[0023] Preferably, the leveling agent brand in step (1) is one or more of BYK333, BYK-350, BYK-352, BYK-354, BYK-378 and BYK-UV3500.

[0024] Preferably, the thickness of the plastic base layer in step (2) is 0.05 mm to 6 mm.

[0025] Preferably, the thickness of the low haze anti-glare coating in step (2) is 5-20 μm. Within this thickness range, the coating has the best adhesion and water boiling resistance.

[0026] Preferably, in step (2), the drying condition is baking at 50-70°C for 5-8 minutes. A temperature below 100°C is conducive to safe production and large-scale production.

[0027] Preferably, in step (2), the low haze anti-glare coating is applied by wet coating.

[0028] Preferably, in step (3), the UV curing conditions are: UV light intensity 100-150 mW / cm 2 、Energy 500-700 mJ / cm 2 Under this UV condition, the coating's performance is the best.

[0029] Compared with the prior art, the low-fog anti-glare resin cover provided by the present invention has the following beneficial effects: (1) The present invention achieves anti-glare properties by adding a substance that is easy to crystallize to the coating, and realizing phase separation of the crystalline state and the amorphous state during curing and crosslinking. The prepared low-haze anti-glare resin cover has the characteristics of low haze, high clarity and good uniformity. That is, the anti-glare mechanism of the present invention is caused by the phase separation of the coating, specifically the phase separation of the crystalline state and the amorphous state, and the anti-glare effect increases with the increase of the crystallinity of the coating.

[0030] (2) The present invention provides a method for preparing a low-fog anti-glare resin cover plate, which has a simple construction process, low cost and high efficiency.

[0031] (3) The low-haze anti-glare resin cover provided by the present invention has a coating with high transparency and does not affect subsequent processing steps such as printing on the back of the panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Attached Figure 1 This is the XRD pattern of the product prepared in Example. DETAILED DESCRIPTION

[0033] The following will combine the contents in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items. It should be understood that, unless otherwise specified, various raw materials in the present invention can be obtained commercially.

[0035] Embodiment 1: (1) Preparation of low haze anti-glare coating: 10 parts of HDDA, 10 parts of TMPTA, 20 parts of LE-6706, 5 parts of CN972, 4 parts of photoinitiator 184, and 0.1 parts of BYK333 were mixed, and diluted and dissolved with 50 parts of PM.

[0036] (2) Coating and drying of low-haze anti-glare coating: The low-haze anti-glare coating of step (1) is coated on the surface of the plastic base layer by flow coating, and the solid content of the anti-glare coating is controlled to be 25-30%, and then the solvent is dried. The drying condition is baking at 50° C. for 7 minutes. In this embodiment, the plastic base layer used is PMMA with a thickness of 2.0 mm.

[0037] (3) UV curing of low haze anti-glare coating: The low haze anti-glare coating after drying in step (2) is subjected to UV curing. In this embodiment, the UV curing condition is a UV light intensity of 100 mW / cm 2 , energy is 500 mJ / cm 2 , forming a low haze anti-glare coating. Embodiment 2:

[0038] (1) Preparation of low haze anti-glare coating: 10 parts of HDDA, 10 parts of TMPTA, 20 parts of LE-6706, 5 parts of CN972, 4 parts of photoinitiator 184, and 0.1 parts of BYK333 were mixed, and diluted and dissolved with 50 parts of PM.

[0039] (2) Coating and drying of low-haze anti-glare coating: The low-haze anti-glare coating of step (1) is coated on the surface of the plastic base layer by flow coating, and the solid content of the anti-glare coating is controlled to be 25-30%, and then the solvent is dried. The drying condition is baking at 70° C. for 7 minutes. In this embodiment, the plastic base layer used is PMMA with a thickness of 2.0 mm.

[0040] (3) UV curing of low haze anti-glare coating: The low haze anti-glare coating after drying in step (2) is subjected to UV curing. In this embodiment, the UV curing condition is a UV light intensity of 100 mW / cm 2 , energy is 500 mJ / cm 2 , forming a low haze anti-glare coating. Embodiment 3:

[0041] (1) Preparation of low haze anti-glare coating: 5 parts of TPGDA, 10 parts of TMPTMA, 20 parts of RU-8090, 10 parts of 6572, 4 parts of photoinitiator 907, and 0.1 parts of BYK352 were mixed, and diluted and dissolved with 25 parts of BA and 25 parts of PM.

[0042] (2) Coating and drying of low-haze anti-glare coating: The low-haze anti-glare coating of step (1) is coated on the surface of the plastic base layer by flow coating, and the solid content of the anti-glare coating is controlled to be 25-30%, and then the solvent is dried. The drying condition is baking at 50° C. for 7 minutes. In this embodiment, the plastic base layer used is PMMA with a thickness of 2.0 mm.

[0043] (3) UV curing of low haze anti-glare coating: The low haze anti-glare coating after drying in step (2) is subjected to UV curing. In this embodiment, the UV curing condition is a UV light intensity of 100 mW / cm 2 , energy is 500 mJ / cm 2 , forming a low haze anti-glare coating.

[0044] Control group 1: (1) Preparation of control group coating: 10 parts of HDDA, 15 parts of TMPTA, 30 parts of LE6706, 3 parts of photoinitiator 184, 0.1 parts of BKY333, and 50 parts of PM for dilution and dissolution to prepare the control group coating.

[0045] (2) Coating of the control group: The coating of step (1) is coated on the surface of the plastic base by flow coating, and the solid content of the anti-glare coating is controlled at 25-30%, and then the solvent is dried at 50°C for 7 minutes; in this example, the plastic base used is PMMA with a thickness of 2.0 mm.

[0046] (3) UV curing of the control group coating: The low haze anti-glare coating after drying in step (2) is subjected to UV curing. In this embodiment, the UV curing condition is a UV light intensity of 100 mW / cm 2 , energy is 500 mJ / cm 2 , forming a low haze anti-glare coating.

[0047] Control group 2: (1) Preparation of control group coating: 10 parts of HDDA, 15 parts of TMPTA, 30 parts of LE6706, 3 parts of photoinitiator 184, 0.1 parts of BKY333, and 50 parts of PM for dilution and dissolution to prepare the control group coating.

[0048] (2) Control group coating: The coating of step (1) was applied on the surface of the plastic base layer by flow coating, and the solid content of the anti-glare coating was controlled at 25-30%, and then the solvent was dried at 70°C for 7 minutes; in this example, the plastic base layer used was PMMA with a thickness of 2.0 mm.

[0049] (3) UV curing of the control group coating: The low haze anti-glare coating after drying in step (2) is subjected to UV curing. In this embodiment, the UV curing condition is a UV light intensity of 100 mW / cm 2 , energy is 500 mJ / cm 2 , forming a low haze anti-glare coating.

[0050] Embodiment Performance measurement: project Test Method Example 1 Example 2 Example 3 Control group 1 Control group 2 Transmittance / % Haze meter 91.24 91.09 90.90 91.10 91.2 Haze / % Haze meter 0.3~0.8 1~2.5 2~3 0 0 Pencil hardness Mitsubishi Pencil 4H 4H 4H 4H 4H Roughness Roughness Tester 0.013 0.014 0.017 0.015 0.016 Anti-glare OK OK OK NG NG It can be seen from the above table that Example 1 has a lower haze of 0.3~0.8, the haze of Example 2 is higher than that of Example 1 because the increase in baking temperature leads to an increase in crystallinity in the coating, the haze of Example 3 is higher than that of Example 2 because the content of easily crystallized polyurethane acrylate in the formula is high, and the haze of Control Group 1 and Control Group 2 does not change because the formula does not contain easily crystallized components and will not cause phase separation, indicating that the haze range of the examples is 0~3%, the haze increases with the increase in crystallinity, and the haze uniformity is good, with good anti-glare performance, and also has good hardness, and the product performance is excellent.

[0051] In addition, XRD characterization was performed on the product of the embodiment, as shown in the accompanying drawings.

[0052] It can be seen from the XRD spectrum in the attached figure that 15-30 are the characteristic peaks of the crystallization of acrylic resin, and the intensity of the characteristic peaks of the crystallization in the embodiment is much higher than that in the control group, indicating that the crystallinity in the embodiment is higher.

Claims

1. A low-fog anti-glare resin cover, comprising a plastic substrate and a low-fog anti-glare coating, characterized in that: The thickness of the plastic base layer is 0.05 mm to 6 mm, and the thickness of the low-haze anti-glare coating is 5 to 20 μm; wherein the low-haze anti-glare coating comprises the following components: difunctional acrylate, trifunctional acrylate, hexafunctional polyurethane acrylate, difunctional polyurethane acrylate, photoinitiator, leveling agent and mixed solvent.

2. The low-fog anti-glare resin cover plate according to claim 1, characterized in that: The plastic base layer is any one of PET, PC, PMMA, PC / PMMA composite and PETG; in the low-fog anti-glare coating, the weight proportions of the components are: 5-10 parts of difunctional acrylate, 10-20 parts of trifunctional acrylate, 20-40 parts of hexafunctional polyurethane acrylate, 5-20 parts of difunctional polyurethane acrylate, 1-5 parts of photoinitiator, 0-1 part of leveling agent and 40-60 parts of mixed solvent.

3. A method for preparing a low-fog anti-glare resin cover plate, characterized in that The method comprises the following preparation steps: (1) Preparation of low haze anti-glare coating: difunctional acrylate, trifunctional acrylate, hexafunctional polyurethane acrylate, difunctional polyurethane acrylate, photoinitiator and leveling agent are mixed according to certain weight proportions, and diluted with a mixed solvent; (2) Coating and drying the low-haze anti-glare coating: coating the low-haze anti-glare coating of step (1) on the surface of the plastic base layer, controlling the coating thickness to a certain level, and then drying the solvent; (3) UV curing of the low-haze anti-glare coating: The low-haze anti-glare coating after drying in step (2) is subjected to UV curing to form a low-haze anti-glare coating with a self-contained structure.

4. The method for preparing a low-fog anti-glare resin cover plate according to claim 3, characterized in that: In step (1), the weight proportions of the components are: 5-10 parts of difunctional acrylate; 10-20 parts of trifunctional acrylate; 20-40 parts of hexafunctional polyurethane acrylate; 5-20 parts of difunctional polyurethane acrylate; 1-5 parts of photoinitiator; 0-1 parts of leveling agent; and 40-60 parts of mixed solvent.

5. The method for preparing a low-fog anti-glare resin cover plate according to claim 4, characterized in that: The difunctional acrylate is any one of 1,6-hexanediol diacrylate HDDA, tripropylene glycol diacrylate TPGDA, and 2-hydroxy-3-propyl methacrylate; the trifunctional acrylate is any one of trimethylolpropane triacrylate TMPTA and trimethylolpropane triacrylate TMPTMA.

6. The method for preparing a low-fog anti-glare resin cover plate according to claim 4, characterized in that: The hexafunctional polyurethane acrylate is a hexafunctional aliphatic polyurethane acrylate polymer or a hexafunctional aromatic polyurethane acrylate polymer.

7. The method for preparing a low-fog anti-glare resin cover plate according to claim 4, characterized in that: The difunctional polyurethane acrylate is an easily crystallized aromatic polyurethane acrylate, which is any one or more of CN 972, CN 999, EB 210 and 6572.

8. The method for preparing a low-fog anti-glare resin cover plate according to claim 4, characterized in that: The photoinitiator is one or more of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-methylphenylpropane-1-one, 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, benzoin dimethyl ether, xylene ketone, 2-isopropylthioxanthone and 2,4,6 (trimethylbenzoyl) diphenylphosphine oxide; the leveling agent is one or more of BYK333, BYK-350, BYK-352, BYK-354, BYK-378 and BYK-UV3500.

9. The method for preparing a low-fog anti-glare resin cover plate according to claim 3, characterized in that: In step (2), the thickness of the plastic base layer is 0.05 mm to 6 mm; the thickness of the low-haze anti-glare coating is 5-20 μm.

10. The method for preparing a low-fog anti-glare resin cover plate according to claim 3, characterized in that: In step (2), the drying condition is baking at 50-70°C for 5-8 minutes; the low haze anti-glare coating is applied by wet coating; in step (3), the UV curing condition is: UV light intensity 100-150 mW / cm 2 、Energy 500-700 mJ / cm 2 .

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