A high ultraviolet blocking rate, high hardness and high hydrophobicity coating and its preparation method

Abstract

The present invention relates to the technical field of coatings, and provides a coating with high UV blocking rate, high hardness, and high hydrophobicity, and a preparation method thereof. The coating comprises the following components by mass: polyurethane acrylate, epoxy acrylate, amino resin, UV monomer, photoinitiator, UV absorber, and crosslinking aid. The method for preparing the coating is as follows: polyurethane acrylate, epoxy acrylate, amino resin, UV monomer, and photoinitiator are placed in a container, mixed and stirred to obtain a uniformly mixed mixture; then UV absorber and crosslinking aid are added, mixed and stirred to obtain a coating with high UV blocking rate, high hardness, and high hydrophobicity; the coating is applied to the surface of a substrate with an ink knife, covered with a release film, rolled evenly, irradiated with ultraviolet light, then the release film is removed, and the substrate is placed in a constant temperature oven for baking to obtain the coating. The coating has the advantages of strong hydrophobicity, high hardness, and high UV blocking rate.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a coating with high ultraviolet blocking rate, high hardness and high hydrophobicity and a preparation method thereof. Background Art

[0002] The display screens of modern electronic products are generally made of specially treated glass or plastic. Glass is highly favored for its excellent hardness and scratch resistance and is widely used in a variety of electronic devices such as smartphones, tablets, and computer monitors. The scratch resistance of glass mainly depends on its hardness. High-hardness glass can withstand the wear and scratches of daily use. However, the glass surface easily absorbs water droplets and fingerprints, causing the surface to become dirty. In order to improve the scratch resistance and anti-pollution ability of the screen, while also achieving the effect of blocking UV rays and protecting the eyes, glass screens are usually covered with one or more layers of protective materials, such as chemically strengthened glass, surface-hardened anti-fouling coatings, and UV-blocking coatings. As the market's requirements for the performance of UV-curable coatings increase, the performance of existing UV-curable coatings in terms of hardness, UV blocking, hydrophobicity, and environmental protection has gradually failed to meet the high standards required for surface coating of electronic products.

[0003] A Chinese invention patent with patent publication number CN115403969A discloses a UV-cured, highly wear-resistant, and highly hydrophobic coating and a preparation method thereof. In this disclosure, a modification method of introducing fluorine atoms and silicon atoms into the resin matrix is adopted to solve the problems of poor surface hardness and wear resistance of the photocured coating in the prior art. However, the coating used in this solution contains solvent-based UV resin and organic solvent, which limits the practical application range of the coating. In addition, the UV coating in this patent does not have a UV blocking effect.

[0004] Chinese invention patent publication number CN1958698A discloses a thermosetting water-based UV-blocking coating and a coating film obtained therefrom. In this disclosure, a water-based polyurethane resin is mixed with a UV absorber to prepare a coating having the ability to block UV rays below 380nm. However, the coating obtained by this solution is not hydrophobic and is easily damaged by friction during use.

[0005] Therefore, the development of a coating with high UV blocking rate, high hardness and high hydrophobicity has obvious application value in the field of surface treatment of glass screens of electronic products. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the object of the present invention is to provide a coating with high ultraviolet blocking rate, high hardness and high hydrophobicity and a preparation method thereof.

[0007] The present invention first provides a coating with high UV blocking rate, high hardness and high hydrophobicity, which comprises the following components by weight:

[0008] Polyurethane acrylate 20% to 35%;

[0009] Epoxy acrylate 20% to 35%;

[0010] Amino resin 20% to 35%;

[0011] UV monomer 5% to 15%;

[0012] Photoinitiator 1% to 5%;

[0013] Ultraviolet absorber 1% to 10%;

[0014] Cross-linking agent 1% to 10%.

[0015] Furthermore, the mass ratio of urethane acrylate, epoxy acrylate, amino resin, and ultraviolet absorber is preferably 25%:28%:26%:5%.

[0016] Furthermore, the mass ratio of UV monomer, photoinitiator and cross-linking aid is preferably 10%:1%:5%.

[0017] Furthermore, the polyurethane acrylate is at least one of organosilicon-modified polyurethane acrylate, organofluorine-modified polyurethane acrylate, and fluorine-silicon-modified polyurethane acrylate; the epoxy acrylate is at least one of modified epoxy acrylate, bisphenol A epoxy acrylate, and novolac epoxy acrylate; the amino resin is at least one of hexamethoxymethyl melamine resin, high iminomethyl etherified amino resin, and butyl etherified amino resin; and the ultraviolet absorber is at least one of benzophenone-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, and triazine-based ultraviolet absorbers.

[0018] Furthermore, the UV monomer is at least one of tris(2-hydroxyethyl)isocyanurate triacrylate, isobornyl methacrylate, and hydroxyethyl methacrylate; the photoinitiator is at least one of 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide; and the crosslinking aid is at least one of titanate, alkenyl silane coupling agent, and aminosilane coupling agent.

[0019] Furthermore, the polyurethane acrylate is preferably fluorosilicone-modified polyurethane acrylate; the epoxy acrylate is preferably modified epoxy acrylate; the amino resin is preferably hexamethoxymethyl melamine resin; and the ultraviolet absorber is preferably a triazine ultraviolet absorber.

[0020] Furthermore, the UV monomer is preferably hydroxyethyl methacrylate; the photoinitiator is preferably 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide; and the crosslinking aid is preferably an aminosilane coupling agent.

[0021] Furthermore, the mass ratio of 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide to phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide is 8:2.

[0022] The present invention also provides a method for preparing the above-mentioned high ultraviolet blocking rate, high hardness and high hydrophobicity coating, comprising the following steps:

[0023] (1) Place polyurethane acrylate, epoxy acrylate, amino resin, UV monomer, and photoinitiator in a container, mix and stir for 60 to 90 minutes to obtain a uniform mixture;

[0024] (2) adding an ultraviolet absorber and a crosslinking aid to the mixture of step (1), mixing and stirring for 30 to 60 minutes to obtain a coating with high ultraviolet blocking rate, high hardness and high hydrophobicity;

[0025] (3) Apply the coating of step (2) to the surface of the substrate with an ink knife, cover it with a release film, roll it evenly, irradiate it with ultraviolet light, then peel off the release film, place the substrate in a constant temperature oven at 150°C and bake it for 30 minutes to 50 minutes to obtain a coating with high ultraviolet blocking rate, high hardness and high hydrophobicity.

[0026] Furthermore, in step (3), the substrate is at least one of 1mm tempered glass, 3mm tempered glass, 1mm ultra-clear glass, and 3mm ultra-clear glass; the release film is a high-temperature resistant PET release film; the wet film thickness of the coating after rolling is uniformly, is 10um to 20um; the ultraviolet irradiation light source is a 395nm-UVLED light source, and the amount of ultraviolet irradiation is 1500mJ / cm 2 ~2000mJ / cm 2 .

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Strong hydrophobicity. Fluorosilicone-modified polyurethane acrylate, modified epoxy acrylate, and hexamethoxymethyl melamine resin are used as the curing matrix. The three resins react to form a network cross-linking, which improves the hardness of the coating and has high hydrophobicity.

[0029] 2. Good wear resistance. Using hydroxyethyl methacrylate as the diluent monomer, aminosilane coupling agent as the crosslinking aid, and 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide as photoinitiators increases the double bond conversion rate of the resin serving as the curing matrix, further enhancing the hardness and wear resistance of the coating.

[0030] 3. High UV blocking rate. The use of triazine-based UV absorbers enables the coating to achieve a high blocking rate for UV rays with a wavelength below 380nm. When the coating thickness is 10um, the blocking rate for UV rays with a wavelength below 380nm reaches over 90%.

[0031] 4. During curing, the coating is irradiated with a UVLED lamp with a specific wavelength of 395nm and thermal curing is used to avoid the failure of the UV blocker due to the reaction of the UVLED lamp, and solve the problem that UV absorbers are difficult to apply to UV-curing coatings.

[0032] 5. Using specific types of fluorosilicone-modified polyurethane acrylate, modified epoxy acrylate, and hexamethoxymethyl melamine resin as the curing matrix, the coating is prepared by laminating, irradiating a UVLED lamp with a specific wavelength, and thermally curing. The coating has a high blocking rate for ultraviolet rays below 380nm, a pencil hardness of 5H, and excellent hydrophobicity, and has obvious application value in the field of surface treatment of glass screens of electronic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the drawings required for describing the specific implementation or the prior art will be briefly introduced below. Obviously, the drawings described below are only one implementation of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is a diagram showing the hydrophobicity test results of Example 1.

[0035] Figure 2 This is a diagram of the hydrophobicity test results of Example 2.

[0036] Figure 3 This is a diagram of the hydrophobicity test results of Example 3.

[0037] Figure 4 This is a diagram showing the hydrophobicity test results of Example 4.

[0038] Figure 5 This is a diagram showing the hydrophobicity test results of Example 5.

[0039] Figure 6This is a diagram showing the hydrophobicity test results of Example 6.

[0040] Figure 7 This is a diagram of the hydrophobicity test results of Example 8.

[0041] Figure 8 This is a diagram showing the hydrophobicity test results of Example 9.

[0042] Figure 9 This is a diagram showing the hydrophobicity test results of Example 10.

[0043] Figure 10 This is a diagram showing the hydrophobicity test results of Example 11.

[0044] Figure 11 This is a diagram of the hydrophobicity test results of Example 12.

[0045] Figure 12 This is a diagram of the hydrophobicity test results of Example 13.

[0046] Figure 13 This is a diagram of the hydrophobicity test results of Example 15.

[0047] Figure 14 This is a diagram showing the hydrophobicity test results of Example 16.

[0048] Figure 15 This is a diagram showing the hydrophobicity test results of Example 17.

[0049] Figure 16 This is a diagram of the hydrophobicity test results of Example 18.

[0050] Figure 17 This is a diagram of the hydrophobicity test results of Example 19.

[0051] Figure 18 This is a diagram of the hydrophobicity test results of Example 20.

[0052] Figure 19 This is a diagram of the hydrophobicity test results of Example 21.

[0053] Figure 20 This is a diagram of the hydrophobicity test results of Example 22.

[0054] Figure 21 This is a diagram of the hydrophobicity test results of Example 23.

[0055] Figure 22 This is a diagram of the hydrophobicity test results of Example 24.

[0056] Figure 23 This is a diagram of the hydrophobicity test results of Example 25.

[0057] Figure 24 This is a diagram of the hydrophobicity test results of Example 26. DETAILED DESCRIPTION

[0058] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the technical solutions in the specific implementation methods of the present invention are clearly and completely described below to further illustrate the present invention. Obviously, the specific implementation methods described are only part of the implementation methods of the present invention, rather than all styles.

[0059] The high ultraviolet blocking rate, high hardness and high hydrophobicity coating of the present invention comprises the following components by weight:

[0060] Polyurethane acrylate 20% to 35%;

[0061] Epoxy acrylate 20% to 35%;

[0062] Amino resin 20% to 35%;

[0063] UV monomer 5% to 15%;

[0064] Photoinitiator 1% to 5%;

[0065] Ultraviolet absorber 1% to 10%;

[0066] Cross-linking agent 1% to 10%.

[0067] The preferred mass proportion of each component is:

[0068] Polyurethane acrylate 25%;

[0069] Epoxy acrylate 28%;

[0070] amino resin 26%;

[0071] UV monomer 10%;

[0072] Photoinitiator 1%;

[0073] UV absorber 5%;

[0074] Cross-linking aid 5%.

[0075] Among them, in terms of the specific selection of each component, the polyurethane acrylate is at least one of organosilicon-modified polyurethane acrylate, organofluorine-modified polyurethane acrylate, and fluorine-silicon-modified polyurethane acrylate; the epoxy acrylate is at least one of modified epoxy acrylate, bisphenol A epoxy acrylate, and novolac epoxy acrylate; the amino resin is at least one of hexamethoxymethylmelamine resin, high-iminomethyl etherified amino resin, and butylated amino resin; the ultraviolet absorber is at least one of benzophenone-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, and triazine-based ultraviolet absorbers; the UV monomer is at least one of tris(2-hydroxyethyl)isocyanurate triacrylate, isobornyl methacrylate, and hydroxyethyl methacrylate; the photoinitiator is at least one of 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide; and the crosslinking aid is at least one of titanate, alkenyl silane coupling agent, and aminosilane coupling agent.

[0076] As a preferred embodiment, the polyurethane acrylate is fluorosilicone-modified polyurethane acrylate; the epoxy acrylate is modified epoxy acrylate; the amino resin is hexamethoxymethyl melamine resin; the ultraviolet absorber is a triazine-based ultraviolet absorber; the UV monomer is hydroxyethyl methacrylate; the photoinitiator is 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and the mass ratio of 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide to phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide is 8:2; and the crosslinking aid is an aminosilane coupling agent.

[0077] The present invention also provides a method for preparing the above-mentioned high ultraviolet blocking rate, high hardness and high hydrophobicity coating, comprising the following steps:

[0078] (1) Place polyurethane acrylate, epoxy acrylate, amino resin, UV monomer, and photoinitiator in a container, mix and stir for 60 to 90 minutes to obtain a uniform mixture;

[0079] (2) adding an ultraviolet absorber and a crosslinking aid to the mixture of step (1), mixing and stirring for 30 to 60 minutes to obtain a coating with high ultraviolet blocking rate, high hardness and high hydrophobicity;

[0080] (3) Apply the coating of step (2) to the surface of the substrate with an ink knife. The substrate can be 1mm tempered glass, 3mm tempered glass, 1mm ultra-white glass or 3mm ultra-white glass. Cover it with a layer of high-temperature resistant PET release film and roll it evenly. Ensure that the wet film thickness of the coating is 10um to 20um after rolling evenly. Then irradiate with ultraviolet light. The ultraviolet light source is a 395nm-UVLED light source, and the amount of ultraviolet light is 1500mJ / cm2 ~2000mJ / cm 2 Then peel off the release film and place the substrate in a constant temperature oven at 150°C and bake for 30 to 50 minutes to obtain a coating with high UV blocking rate, high hardness and high hydrophobicity.

[0081] In order to determine the preferred components and suitable contents of the high UV blocking rate, high hardness and high hydrophobicity coating of the present invention, the present invention prepared a control test with different components and different contents according to the above method.

[0082] Wherein, in step (3), the substrate is 3mm tempered glass; the coating wet film thickness after rolling is 10um; the ultraviolet irradiation light source is 395nm-UVLED light source, and the ultraviolet irradiation light intensity is 1500mJ / cm 2 .

[0083] Among them, the fluorosilicone modified polyurethane acrylate used in the experiment was purchased from Dongguan Inoue New Materials Development Co., Ltd., model number UV-9843-9; modified epoxy acrylate was purchased from Jining Tangyi Chemical Co., Ltd., model number WDS-8056; hexamethoxymethyl melamine resin was purchased from Foshan Wengkaier Co., Ltd., model number CYMEL 303; hydroxyethyl methacrylate, CAS number 868-77-9; 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide, CAS number 75980-60-8, phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide, CAS number 42013-20-7; triazine-based UV absorber, CAS number 147315-50-2; aminosilane coupling agent, CAS number 2530-85-0.

[0084] All the prepared high UV blocking rate, high hardness and high hydrophobicity coatings were subjected to hardness test, abrasion resistance test, hydrophobicity test and UV blocking rate test, and then compared. The test methods are:

[0085] Adhesion grade test: All prepared coatings are tested for adhesion according to GB / T9286-2021 "Paints and varnishes: Cross-cut test".

[0086] Hardness test: All prepared coatings were tested for their hardness according to GB / T6739-2022 “Paints and varnishes: Determination of film hardness by pencil method”.

[0087] Abrasion resistance test: All prepared coatings were rubbed 100 times with a 1kg weight using a US TABER CS-17 abrasion-resistant rubber. The surface condition of the coatings was observed. If the coating surface was scratch-free, it was rated A; if the coating surface was scratched, it was rated B.

[0088] Hydrophobicity test: All prepared coatings were tested for contact angle using a contact angle meter. The larger the contact angle, the stronger the hydrophobicity of the coating (the experimental results are shown in Figures 1 to 24 shown).

[0089] UV blocking rate test: All prepared coatings are tested for UV blocking rate below 380nm using a UV blocking rate tester. Five points are randomly selected and the average value is taken. The greater the blocking rate, the stronger the UV blocking performance.

[0090] The comparative data is shown in the following table:

[0091] Table 1 Composition and content data of Examples 1 to 7

[0092] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Silicone modified polyurethane acrylate 25 0 0 0 0 0 0 Organic fluorine-modified polyurethane acrylate 0 25 0 0 0 0 0 Fluorosilicone modified polyurethane acrylate 0 0 25 15 20 30 35 Modified epoxy acrylate 28 28 28 28 28 28 28 Hexamethoxymethyl melamine resin 26 26 26 26 26 26 26 UV monomer 10 10 10 20 15 5 0 Photoinitiator 1 1 1 1 1 1 1 Triazine-based UV absorbers 5 5 5 5 5 5 5 Crosslinking aids 5 5 5 5 5 5 5

[0093] Table 2 Experimental results of Examples 1 to 7

[0094] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Adhesion level Level 0 Level 0 Level 0 Level 0 Level 0 Level 1 Viscosity is too high hardness 3H 5H 5H 3H 4H 6H Viscosity is too high wear resistance Class B A-level A-level A-level A-level A-level Viscosity is too high Contact angle (degrees) 93.4 96.9 102.3 87.9 100.6 103.4 Viscosity is too high UV blocking rate (%) 91.36 91.35 91.68 91.66 91.28 91.55 Viscosity is too high

[0095] It can be seen from Examples 1 to 3 that when the polyurethane acrylate uses fluorosilicone-modified polyurethane acrylate, the coating has higher hardness, wear resistance and hydrophobicity. It can be seen from Examples 3 to 7 that when the mass proportion of fluorosilicone-modified polyurethane acrylate is 25%, the coating has the best adhesion to the glass while maintaining good hardness, wear resistance and hydrophobicity.

[0096] Table 3 Composition and content data of Examples 8 to 14

[0097] Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 Fluorosilicone modified polyurethane acrylate 25 25 25 25 25 25 25 Modified epoxy acrylate 0 0 28 15 20 30 35 Bisphenol A epoxy acrylate 0 28 0 0 0 0 0 Novolac epoxy acrylate 28 0 0 0 0 0 0 Hexamethoxymethyl melamine resin 26 26 26 26 26 26 26 UV monomer 10 10 10 23 18 8 3 Photoinitiator 1 1 1 1 1 1 1 Triazine-based UV absorbers 5 5 5 5 5 5 5 Crosslinking aids 5 5 5 5 5 5 5

[0098] Table 4 Experimental results of Examples 8 to 14

[0099] Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 Adhesion level Level 4 Level 4 Level 0 Level 1 Level 1 Level 1 Viscosity is too high hardness 5H 5H 5H 2H 3H 5H Viscosity is too high wear resistance A-level A-level A-level Class B Class B A-level Viscosity is too high Contact angle (degrees) 103.3 102.1 103.1 104.2 103.9 102.4 Viscosity is too high UV blocking rate (%) 91.46 91.33 91.56 91.28 91.11 91.32 Viscosity is too high

[0100] It can be seen from Examples 8 to 10 that when modified epoxy acrylate is used, the coating has better adhesion to the glass. It can be seen from Examples 10 to 14 that when the mass proportion of modified epoxy acrylate is 28%, the coating has the best adhesion to the glass while maintaining good hardness, wear resistance and hydrophobicity.

[0101] Table 5 Composition and content data of Examples 15 to 21

[0102] Example 15 Example 16 Example 17 Example 18 Example 19 Example 20 Example 21 Fluorosilicone modified polyurethane acrylate 25 25 25 25 25 25 25 Modified epoxy acrylate 28 28 28 28 28 28 28 Hexamethoxymethyl melamine resin 0 0 26 15 20 25 30 High iminomethyl etherified amino resin 0 26 0 0 0 0 0 Butyl ether amino resin 26 0 0 0 0 0 0 UV monomer 10 10 10 21 16 11 6 Photoinitiator 1 1 1 1 1 1 1 Triazine-based UV absorbers 5 5 5 5 5 5 5 Crosslinking aids 5 5 5 5 5 5 5

[0103] Table 6 Experimental results of Examples 15 to 21

[0104] Example 15 Example 16 Example 17 Example 18 Example 19 Example 20 Example 21 Adhesion level Level 4 Level 4 Level 0 Level 1 Level 1 Level 0 Level 1 hardness 2H 5H 5H 3H 3H 4H 5H wear resistance Class B A-level A-level Class B Class B A-level A-level Contact angle (degrees) 101.0 101.9 102.7 103.5 103.6 102.0 103.5 UV blocking rate (%) 91.23 91.07 91.37 91.69 91.18 91.34 91.58

[0105] It can be seen from Examples 15 to 17 that when the amino resin adopts hexamethoxymethyl melamine resin, the coating has better adhesion, wear resistance and higher hardness. It can be seen from Examples 17 to 21 that when the mass proportion of hexamethoxymethyl melamine resin is 26%, the coating has the best adhesion to the glass while maintaining good hardness, wear resistance and hydrophobicity.

[0106] Table 7 Composition and content data of Examples 22 to 28

[0107] Example 22 Example 23 Example 24 Example 25 Example 26 Example 27 Example 28 Fluorosilicone modified polyurethane acrylate 25 25 25 25 25 25 25 Modified epoxy acrylate 28 28 28 28 28 28 28 Hexamethoxymethyl melamine resin 26 26 26 26 26 26 26 UV monomer 10 10 10 12 8 6 4 Photoinitiator 1 1 1 1 1 1 1 Benzophenone-based UV absorbers 5 0 0 0 0 0 0 Benzotriazole UV absorbers 0 5 0 0 0 0 0 Triazine-based UV absorbers 0 0 5 3 7 9 11 Crosslinking aids 5 5 5 5 5 5 5

[0108] Table 8 Experimental results of Examples 22 to 28

[0109] Example 22 Example 23 Example 24 Example 25 Example 26 Example 27 Example 28 Adhesion level Level 0 Level 0 Level 0 Level 0 Level 0 Unable to solidify Unable to solidify hardness 5H 5H 5H 5H 3H Unable to solidify Unable to solidify wear resistance A-level A-level A-level A-level Class B Unable to solidify Unable to solidify Contact angle (degrees) 102.8 102.9 104.7 103.7 102.8 Unable to solidify Unable to solidify UV blocking rate (%) 75.33 73.63 91.44 86.65 93.32 Unable to solidify Unable to solidify

[0110] It can be seen from Examples 22 to 28 that when a triazine-based ultraviolet absorber is used as the ultraviolet absorber, the ultraviolet blocking rate reaches more than 90%. It can be seen from Examples 24 to 28 that when the mass proportion of the triazine-based ultraviolet absorber is 5%, the ultraviolet blocking rate of the coating is optimal and good hardness is maintained.

[0111] The above describes the main technical features and basic principles of the present invention and the related advantages. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments and that the present invention can be implemented in other specific forms without departing from the concept or essential characteristics of the present invention. Therefore, from all perspectives, the above-mentioned specific embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all changes that come within the meaning and range of equivalents of the claims be included within the present invention.

[0112] In addition, it should be understood that although this specification is described according to various implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for preparing a coating with high ultraviolet blocking rate, high hardness and high hydrophobicity, characterized in that: The following steps are involved: (1) Place polyurethane acrylate, epoxy acrylate, amino resin, UV monomer, and photoinitiator in a container, mix and stir for 60 to 90 minutes to obtain a uniform mixture; (2) adding an ultraviolet absorber and a crosslinking aid to the mixture of step (1), mixing and stirring for 30 to 60 minutes to obtain a coating with high ultraviolet blocking rate, high hardness and high hydrophobicity; (3) Apply the coating of step (2) to the surface of the substrate with an ink knife, cover it with a release film, roll it evenly, and irradiate it with ultraviolet light. The ultraviolet light source is a 395nm-UVLED light source. Then, remove the release film and bake the substrate in a constant temperature oven at 150°C for 30 minutes to 50 minutes to obtain a coating with high ultraviolet blocking rate, high hardness and high hydrophobicity; The weight proportions of each component are as follows: Polyurethane acrylate 20% to 30%; Epoxy acrylate 28% to 30%; Amino resin 25% to 30%; UV monomer 5% to 15%; Photoinitiator 1% to 5%; Ultraviolet absorber 3% to 5%; Cross-linking aid 1% to 10%; Wherein, the UV monomer is at least one of tris(2-hydroxyethyl)isocyanurate triacrylate, isobornyl methacrylate, and hydroxyethyl methacrylate; The polyurethane acrylate is fluorosilicone modified polyurethane acrylate; Epoxy acrylate is a modified epoxy acrylate; The amino resin is hexamethoxymethyl melamine resin; The ultraviolet absorber is a triazine-based ultraviolet absorber.

2. The method for preparing a high ultraviolet blocking rate, high hardness and high hydrophobicity coating according to claim 1, wherein: In step (3), the substrate is one of 1mm tempered glass, 3mm tempered glass, 1mm ultra-clear glass, and 3mm ultra-clear glass; the release film is a high-temperature resistant PET release film; the wet film thickness of the coating after rolling is uniformly, and the amount of ultraviolet light irradiation is 1500mJ / cm 2 ~2000mJ / cm 2 .

3. The method for preparing a high ultraviolet blocking rate, high hardness and high hydrophobicity coating according to claim 1, wherein: The components are calculated by weight as follows: polyurethane acrylate 25%, epoxy acrylate 28%, amino resin 26%, ultraviolet absorber 5%, UV monomer 10%, photoinitiator 1%, and cross-linking aid 5%.

4. The method for preparing a high ultraviolet blocking rate, high hardness and high hydrophobicity coating according to claim 1, wherein: The photoinitiator is at least one of 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide; The cross-linking auxiliary agent is at least one of titanate, alkenyl silane coupling agent and amino silane coupling agent.

5. The method for preparing a high ultraviolet blocking rate, high hardness and high hydrophobicity coating according to claim 4, wherein: The UV monomer is hydroxyethyl methacrylate; The photoinitiators were 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide; The cross-linking auxiliary agent is an aminosilane coupling agent.

6. The method for preparing a high ultraviolet blocking rate, high hardness and high hydrophobicity coating according to claim 5, wherein: The mass ratio of 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide to phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide is 8:

2.

7. A high ultraviolet blocking rate, high hardness and high hydrophobicity coating, characterized in that: The coating is prepared by the method for preparing a coating with high ultraviolet blocking rate, high hardness and high hydrophobicity as described in any one of claims 1 to 6.

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