Water-based ultraviolet and heat dual-curing skin-touch coating as well as preparation method and application thereof

Abstract

The invention discloses a water-based ultraviolet and heat dual-curing skin-touch coating as well as a preparation method and application thereof, and belongs to the technical field of coatings. According to the water-based ultraviolet heat dual-curing skin-touch coating provided by the invention, the components with proper mass percent are selected and matched with one another, so that relatively high hardness and good adhesive force of a subsequently prepared coating can be effectively realized, and the correspondingly obtained coating has excellent wear resistance and anti-pollution effect; in addition, the correspondingly prepared coating also has an ultra-matte effect and a good skin feeling effect.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and particularly relates to a water-based UV-thermal dual-curing skin-feel coating, its preparation method, and its application. Background Technology

[0002] In recent years, with the improvement of living standards, people are increasingly pursuing a better user experience when purchasing electronic products, smart home furnishings, automobiles, and other products. The appearance and tactile feel of products are increasingly influencing customers' purchasing experience. Among existing tactile and skin-feel coatings, excimer UV skin-feel coatings have become the current trend due to their excellent skin-feel effect and good mechanical properties.

[0003] However, excimer UV skin-feel coatings require pre-curing with a 395nm LED, followed by rapid shrinkage and wrinkling with a 172nm / 254nm excimer lamp, and finally irradiation with a conventional mercury lamp to fix the surface micro-wrinkles, in order to obtain a coating with a good skin-feel effect. This method is complex and the equipment cost is high, which limits the popularization of UV skin-feel coatings. In addition, oil-based UV coatings have high VOC emissions, which pollute the environment.

[0004] Current water-based skin-feel coatings have a small environmental impact, but their use of large amounts of matting agents, feel agents, and fluffing agents to provide the feel results in poor skin-feel effects, susceptibility to scratches, and poor durability. Therefore, there is a need to develop a water-based UV skin-feel coating that has a skin-feel, ultra-matte finish, and excellent mechanical properties, requiring only conventional curing without the need for large amounts of matting agents. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an ultra-matte waterborne UV-curable dual-curing skin-feel coating with high hardness, good adhesion, excellent abrasion resistance and stain resistance, and excellent skin feel, as well as its preparation method and application.

[0006] To achieve the above objectives, in a first aspect, the present invention provides an aqueous UV-thermal dual-curing skin-feel coating, the coating comprising the following components by weight percentage: 60-80% waterborne UV-curable polyurethane resin, 5-10% reactive monomers, 2-4% photoinitiator, 0.1-2% additives, 3-8% film-forming agent, 5-15% fluorocarbon modified blocked curing agent, balance water; The functionality of the waterborne UV-curable polyurethane resin is 3-8; The fluorocarbon modified blocked curing agent is obtained by reacting polyisocyanate, blocking agent and long-chain fluorocarbon under the action of a catalyst; the long-chain fluorocarbon has more than 8 carbon atoms and includes hydroxyl groups.

[0007] The water-based UV-curable dual-curing skin-feel coating provided by this invention, by selecting appropriate mass percentages of components and coordinating the components with each other, can effectively achieve high hardness and good adhesion of the subsequently prepared coating, and the corresponding coating has excellent wear resistance and anti-fouling effect; in addition, the corresponding coating also has an ultra-matte effect and a good skin-feel effect.

[0008] Specifically, this invention involves selectively adding a specific type of fluorocarbon-modified blocked curing agent and a waterborne UV-curable polyurethane resin with a specific functionality range. The fluorocarbon-modified blocked curing agent, containing a specific number of carbon atoms and including hydroxyl groups, can migrate to the coating surface within the resin system. During subsequent coating formation, heating causes a polymer crosslinking reaction on the surface, followed by radiation curing. This achieves asynchronous crosslinking densities between the surface and inner layers, forming micro-wrinkles and resulting in an excellent skin-feel effect. Simultaneously, the introduction of the fluorocarbon-modified blocked curing agent, combined with active monomers within a specific mass percentage range and a waterborne UV-curable polyurethane resin with a specific functionality range, enables the coating to achieve excellent abrasion resistance and stain resistance; and a super-matte effect can be achieved without adding matting agents.

[0009] For example, the functionality of the waterborne UV-curable polyurethane resin can be any point value between 3 and 8 or a range between any two points, such as 3, 4, 5, 6, 7, 8, etc.

[0010] For example, the waterborne UV-curable polyurethane resin may be WR80191 (functionality 3) or WR-80172 (functionality 6) from Guangdong Haohui New Materials Co., Ltd., or 177-E8017 (functionality 8) or 178-E9026 (functionality 4) from Guangdong Honeycomb Nano Co., Ltd.

[0011] As a preferred embodiment of the coating of the present invention, the preparation method of the fluorocarbon modified blocked curing agent includes the following steps: S1. At 40-60℃, an acetone solution containing a blocking agent is added dropwise to a mixture of polyisocyanate and catalyst, and the reaction is carried out for 3-4 hours after the addition is completed. S2. After heating to 60-80℃, add dropwise an acetone solution containing long-chain fluorocarbons. After the addition is complete, react for 4-5 hours. After the reaction is complete, a fluorocarbon-modified blocked curing agent is obtained.

[0012] As a preferred embodiment of the coating described in this invention, the molar ratio of active hydrogen in the sealing agent, catalyst, and isocyanate in the polyisocyanate is (0.7-0.8):(0.005-0.03):1.

[0013] As a preferred embodiment of the coating described in this invention, the molar ratio of active hydrogen in the long-chain fluorocarbon to isocyanate in the polyisocyanate is (0.3-0.4):1.

[0014] The active hydrogen in the blocking agent and the active hydrogen in the long-chain fluorocarbon include hydrogen in hydroxyl (-OH), amino (-NH2), and imine (-NH-).

[0015] It should be noted that the test method for the molar content of active hydrogen in the sealing agent is: isocyanate titration method, specifically, reacting excess toluene diisocyanate (TDI) with hydroxyl (-OH), amino (-NH2), and imine (-NH-) groups, and titrating the remaining TDI with di-n-butylamine.

[0016] It should be noted that the test method for the molar content of active hydrogen in the long-chain fluorocarbon is: isocyanate titration method, specifically, reacting excess toluene diisocyanate (TDI) with hydroxyl groups, and titrating the remaining TDI with di-n-butylamine.

[0017] It should be noted that the test method for the molar content of isocyanate in the polyisocyanate is: di-n-butylamine back titration method, specifically, excess di-n-butylamine reacts with -NCO to form urea bonds, and the remaining di-n-butylamine is titrated with hydrochloric acid standard solution. The -NCO content is inferred by the amount of hydrochloric acid consumed.

[0018] In a preferred embodiment of the coating described in this invention, the mass ratio of the sealant to acetone in the acetone solution is (0.57-1.38):1.

[0019] In a preferred embodiment of the coating of the present invention, the mass ratio of long-chain fluorocarbon to acetone in the acetone solution of the long-chain fluorocarbon is (0.8-1):1.5.

[0020] This invention has found that when the molar ratio of substances and the mass ratio of substances to solvent are selected within the above-mentioned ranges during the preparation of long-chain fluorocarbons, the long-chain fluorocarbons prepared subsequently can better cooperate with other components and effectively migrate to the surface, forming different crosslinking densities in the inner and outer layers, and achieving excellent comprehensive performance of the coating in conjunction with other components.

[0021] As a preferred embodiment of the coating of the present invention, the polyisocyanate includes at least one of hexamethylene diisocyanate trimer, hexamethylene diisocyanate biuret, hexamethylene diisocyanate urea dione, pentamethylene pentane diisocyanate trimer, and isophorone diisocyanate trimer.

[0022] Preferably, the polyisocyanate comprises hexamethylene diisocyanate trimer and isophorone diisocyanate trimer, wherein the mass ratio of the hexamethylene diisocyanate trimer to the isophorone diisocyanate trimer is 1:(4-6).

[0023] This invention has revealed that different types of polyisocyanates, due to differences in their molecular structures, have varying effects on the performance of the resulting coatings. Further selection of polyisocyanates, including hexamethylene diisocyanate trimer and isophorone diisocyanate trimer, reveals that hexamethylene diisocyanate trimer exhibits strong molecular chain mobility, providing the coating with excellent flexibility and impact resistance. The cyclohexane in isophorone diisocyanate trimer, with its rigid structure, effectively restricts chain segment movement, thus providing the coating with higher hardness and scratch resistance. When these two are combined in the aforementioned ratio, excellent hardness, abrasion resistance, and stain resistance can be achieved simultaneously, and they can be combined with other components to achieve an ultra-matte finish and excellent skin feel.

[0024] In a preferred embodiment of the coating of the present invention, the sealing agent includes at least one of acetone oxime, dibutylamine, and hexamethylenediamine (HDA).

[0025] This invention has found that different types of curing agents have different desealing temperatures, steric hindrances, and volatility, which to some extent affect the performance of coatings when the prepared fluorocarbon modified blocked curing agent is used as a component. When the blocking agent is further selected to include the above-mentioned types of substances, the overall performance of the coating prepared subsequently is better.

[0026] In a preferred embodiment of the coating described in this invention, the catalyst comprises an organotin catalyst.

[0027] Preferably, the organotin catalyst comprises dibutyltin dilaurate.

[0028] As a preferred embodiment of the coating described in this invention, the long-chain fluorocarbon includes at least one of perfluorooctyl ethanol and hydroxyl fluorosilicone oil.

[0029] For example, the hydroxyl fluorosilicone oil may be Momentive's HFS-10 (20 carbon atoms) or the like.

[0030] Preferably, in step S1, the dripping time is 25-35 minutes.

[0031] Preferably, in step S2, the dripping time is 25-35 minutes.

[0032] As a preferred embodiment of the coating of the present invention, the active monomer includes at least one of hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), acryloyloxymorpholine (ACMO), hexanediol diacrylate (HDDA), trimethylolpropane triacrylate (TMPTA), and ethoxylated bis(trimethylolpropane)tetraacrylate (EO-Di-TMPTA).

[0033] As a preferred embodiment of the coating of the present invention, the active monomers include hydroxyethyl methacrylate, acryloyloxymorpholine and ethoxylated bis(trimethylolpropane)tetraacrylate, and the mass ratio of hydroxyethyl methacrylate, acryloyloxymorpholine and ethoxylated bis(trimethylolpropane)tetraacrylate is (4-8):(2-4):1.

[0034] This invention has found that the type of active monomer affects reactivity, chemical stability, and degree of crosslinking. When active monomers are further selected to include substances within the above-mentioned specific mass ratio range, the substances can cooperate with each other to effectively improve the overall effect of the coating.

[0035] As a preferred embodiment of the coating of the present invention, the photoinitiator includes at least one of 1-hydroxycyclohexylphenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone, 2-hydroxy-2-methylphenylpropanone, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0036] In a preferred embodiment of the coating of the present invention, the film-forming agent includes at least one of propylene glycol methyl ether, dipropylene glycol methyl ether, dipropylene glycol n-butyl ether, propylene glycol n-butyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, and ethanol.

[0037] In a preferred embodiment of the coating of the present invention, the additives include at least one of leveling agents, wetting agents, defoamers, and thickeners.

[0038] For example, the leveling agent may be at least one of BYK-333 and Tego4100; the wetting agent may be at least one of BYK346 and Byk381; the defoamer may be at least one of Tego902w and BYK 093; and the thickener may be at least one of Hemings 299 and PUR65.

[0039] In a second aspect, the present invention provides a method for preparing the coating, the method comprising the following steps: mixing the components and stirring at a speed of 600-800 r / min for 30-60 min, then filtering, collecting the filtrate, and obtaining the coating.

[0040] In a preferred embodiment of the preparation method described in this invention, the filtration is performed through a 200-400 mesh filter.

[0041] A third aspect of the present invention provides a method of using the coating, the method comprising the following steps: applying the coating to a substrate surface, allowing it to stand and level, baking it at 90-110°C for 8-12 minutes, and then baking it at 600-800 mJ / cm². 2 The coating is formed by curing the mercury under a mercury lamp.

[0042] A fourth aspect of the present invention provides the application of the coating in the preparation of 3C electronics, smart home decoration, and automotive interiors.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows: The water-based UV-curable dual-curing skin-feel coating provided by this invention, through the selection of appropriate mass percentages of components and their synergistic effects, effectively achieves high hardness and good adhesion in the subsequently prepared coating. The resulting coating also exhibits excellent wear resistance and stain resistance. Furthermore, the prepared coating achieves a super-matte finish without the addition of large amounts of matting powder, and simultaneously possesses a good skin-feel effect. Moreover, the coating preparation process provided by this invention is simple, eliminating the need for multiple curing processes using LED lamps, excimer lamps, and mercury lamps to achieve a skin-feel effect similar to excimer UV coatings, thus reducing the cost of skin-feel coatings and facilitating practical production use. Detailed Implementation

[0044] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0045] Unless otherwise specified, the reagents, methods and equipment used in this invention are all conventional reagents, methods and equipment in the art; and unless otherwise specified, the components used in the examples and comparative examples are the same.

[0046] Waterborne UV-curable polyurethane resin 1: WR-80172, functionality 6, Guangdong Haohui Technology Co., Ltd.; Waterborne UV-curable polyurethane resin 2: WR80191, functionality 3, Guangdong Haohui New Materials Co., Ltd.; Waterborne UV-curable polyurethane resin 3: WU3202, functionality 2, Guangzhou Wuxing Materials Technology Co., Ltd.; Waterborne UV-curable polyurethane resin 4: WR80252, functionality 10, Guangdong Haohui New Materials Co., Ltd.

[0047] Active monomer 1: A mixture formed by hydroxyethyl methacrylate, acryloxymorpholine and ethoxylated bis(trimethylolpropane)tetraacrylate in a mass ratio of 6:3:1; Active monomer 2: A mixture formed by hydroxyethyl methacrylate, acryloyloxymorpholine and ethoxylated bis(trimethylolpropane)tetraacrylate in a mass ratio of 3:6:1; Active monomer 3: A mixture formed by hydroxyethyl acrylate, hexanediol diacrylate and trimethylolpropane triacrylate in a mass ratio of 6:3:1; Active monomer 4: A mixture of hydroxyethyl methacrylate and ethoxylated bis(trimethylolpropane)tetraacrylate in a mass ratio of 6:4; Active monomer 5: Hydroxyethyl methacrylate.

[0048] Photoinitiator: 1-hydroxycyclohexylphenyl ketone, commercially available.

[0049] Film-forming agent: Propylene glycol methyl ether, commercially available.

[0050] Wetting agent: BYK346, BYK; Defoamer: 902w, Digo; Leveling agent: BYK-333, BYK; Thickener: 299, Hemings: Curing agent 1: Fluorocarbon modified blocked curing agent, self-made, preparation method includes the following steps: S1. At 50°C, an acetone solution containing a blocking agent (hexamethylenediamine) is added dropwise to a mixture of polyisocyanate (a mixture of hexamethylene diisocyanate trimer and isophorone diisocyanate trimer in a mass ratio of 1:5) and catalyst (dibutyltin dilaurate). The dropwise addition time is 30 min, and the reaction is carried out for 3 h after the dropwise addition is completed. S2. After heating to 70℃, add dropwise an acetone solution containing long-chain fluorocarbon (perfluorooctyl ethanol, with 10 carbon atoms) for 30 minutes. After the addition is completed, react for 4 hours. After the reaction is completed, curing agent 1 is obtained. The molar ratio of active hydrogen in the blocking agent, catalyst, and isocyanate in the polyisocyanate is 0.7:0.005:1; the molar ratio of active hydrogen in the long-chain fluorocarbon to isocyanate in the polyisocyanate is 0.4:1; the mass ratio of blocking agent to acetone in the acetone solution is 0.58:1; and the mass ratio of long-chain fluorocarbon to acetone in the acetone solution is 0.8:1.5. Curing Agent 2: Fluorocarbon modified blocked curing agent, self-made. The preparation method differs from that of fluorocarbon modified blocked curing agent 1 in that the molar ratio of active hydrogen, catalyst, and isocyanate in the blocked agent is 0.8:0.03:1; the molar ratio of active hydrogen in the long-chain fluorocarbon to isocyanate in the polyisocyanate is 0.3:1; the mass ratio of blocked agent to acetone in the acetone solution is 1.38:1; and the mass ratio of long-chain fluorocarbon to acetone in the acetone solution is 1:1.5. Curing agent 3: Fluorocarbon modified blocked curing agent, self-made. The difference between the preparation method and that of fluorocarbon modified blocked curing agent 1 is that the polyisocyanate is a mixture of hexamethylene diisocyanate biuret and isophorone diisocyanate trimer in a mass ratio of 1:5. Curing agent 4: Fluorocarbon modified blocked curing agent, self-made. The difference between the preparation method and that of fluorocarbon modified blocked curing agent 1 is that the polyisocyanate is a hexamethylene diisocyanate trimer. Curing agent 5: Fluorocarbon modified blocked curing agent, self-made. The difference between the preparation method and that of fluorocarbon modified blocked curing agent 1 is that the blocking agent is acetone oxime. Curing Agent 6: Fluorocarbon modified blocked curing agent, self-made. The difference between the preparation method and that of fluorocarbon modified blocked curing agent 1 is that the long-chain fluorocarbon is hydroxyl fluorosilicone oil (purchased from Momentive HFS-10, 20 carbon atoms). Curing agent 7: Fluorocarbon modified blocked curing agent, self-made. The difference between the preparation method and that of fluorocarbon modified blocked curing agent 1 is that the long-chain fluorocarbon is perfluorohexylethanol (8 carbon atoms). Curing Agent 8: Fluorocarbon modified blocked curing agent, self-made. The difference between the preparation method and that of fluorocarbon modified blocked curing agent 1 is that the long-chain fluorocarbon is perfluorooctyl ethane (10 carbon atoms, excluding hydroxyl groups). Curing Agent 9: Blocked curing agent, self-made. The difference between the preparation method and that of fluorocarbon modified blocked curing agent 1 is that 1-dodecyl alcohol (with 12 carbon atoms, excluding fluorine) is used instead of long-chain fluorocarbon.

[0051] Examples 1-13 and Comparative Examples 1-8 This invention provides an aqueous UV-thermal dual-curing skin-feel coating, the components (mass percentage) of which are shown in Tables 1-3; Table 1 Table 2 Table 3 The preparation method of the water-based UV-thermal dual-curing skin-feel coating provided in Example 1 includes the following steps: The components were mixed and stirred at 700 rpm for 45 minutes, then filtered, and the filtrate was collected to obtain the coating.

[0052] The preparation methods of the waterborne UV thermal dual-curing skin-feel coatings provided in Examples 2-13 and Comparative Examples 1-8 are consistent with those in Example 1.

[0053] Example of effect The performance of the water-based UV-curable skin-feel coatings prepared in the examples and comparative examples of this invention is verified by coating the coating onto the surface of a substrate (polycarbonate substrate), allowing it to stand and level, baking it at 100°C for 10 minutes, and then baking it under a conventional mercury lamp (700 mJ / cm²). 2 The film was cured under irradiation to obtain a coating with a thickness of 25±5μm; the performance of the corresponding coating was then tested, including the following aspects: (1) Pencil hardness test: The test was conducted according to the method of ASTM D3363-2005 for determining the hardness of the paint film by pencil test. The grades were H1~H6 (the larger the number, the stronger the hardness), F, HB, B1~B6 (the larger the number, the softer the hardness), H1~H6>HB>B1~B6; (2) Adhesion test: The test shall be conducted in accordance with GB / T9286-1998. The lower the grade value, the better the adhesion. (3) Gloss (60° gloss) test: The test shall be conducted in accordance with GB / T 9754-2025. Specifically, a gloss meter shall be used for measurement. The larger the number, the higher the gloss. (4) RCA resistance test: The test shall be conducted in accordance with the standard test method of ASTM F2357-10 for determining the abrasion resistance of ink and coating on membrane switches using the NORMAN tool "RCA" abrasion tester. Specifically, the friction test shall be conducted using an RCA paper tape abrasion tester, and the number of abrasion cycles is the number of times the bottom is exposed. (5) Stain resistance test: The test is conducted in accordance with GB / T 9780-2013 "Test method for stain resistance of architectural coatings". Specifically, the surface of the coating is marked with an oil-based pen, and after 5 minutes, it is wiped with a dry paper towel to observe the removal effect. If the stain can be completely removed with several cloths in 1-2 times, it is considered stain-resistant. If the stain can be completely removed with several cloths with a little force (3-5 times), it is considered slightly stain-resistant. If the stain can be removed with several cloths dipped in a small amount of alcohol (3-5 times), it is considered moderately stain-resistant. If the stain cannot be removed with several cloths dipped in a small amount of alcohol (3-5 times), it is considered not stain-resistant. (6) Skin feel effect test: The same tester gently touches the coating with the back of his hand and moves it back and forth to feel the skin feel effect of the coating and judge the skin feel effect; among them, silky velvet, hard and smooth, oily, dry and smooth, dry and rough are used to describe it. Silky velvet indicates excellent skin feel, and the other descriptions represent no obvious skin feel, that is, poor skin feel. The results are shown in Table 4. Table 4 As can be seen from Table 4, when the technical solution provided by this invention is adopted, the resulting product has excellent overall performance. This is reflected in the fact that the product has excellent pencil hardness, adhesion, abrasion resistance, and stain resistance. The product is also ultra-matte and has a good skin feel. Specifically, the pencil hardness of the product is above F grade, the adhesion is 0 grade, the gloss is below 3.4°, the RCA resistance is above 100 times, the product has stain resistance, and the skin feel is excellent, specifically a silky velvet feel. As can be seen from Examples 1-3 and Comparative Examples 6-7, the mass percentage of the components affects the overall performance of the product. When the mass percentage of the active monomer in Comparative Example 7 is not within the range given by this invention, specifically, when the monomer is added too much, the surface photocuring is quickly terminated, resulting in a product with poor wear resistance, poor adhesion, decreased stain resistance, and a dry, slippery coating. When the mass percentage of the curing agent in Comparative Example 6 is not within the range given by this invention, specifically, when the amount of curing agent added is too much, the resulting product has a high gloss, and its stain resistance, adhesion, and wear resistance all show a decreasing trend, with a dry feel. As can be seen from Examples 1, 4, and Comparative Examples 4-5, the functionality of the waterborne UV-curable polyurethane resin affects the overall performance of the product. When the functionality of the waterborne UV-curable polyurethane resin in Comparative Example 4 is too low, the adhesion of the obtained product decreases, the gloss increases, and the abrasion resistance and stain resistance decrease significantly. In addition, the skin feel of the obtained product is poor, and it is in a dry and slippery state. When the functionality of the waterborne UV-curable polyurethane resin in Comparative Example 5 is too high, the obtained product is brittle, the adhesion decreases significantly, it is difficult to wrinkle, the gloss increases significantly, the stain resistance decreases, and the skin feel of the obtained product deteriorates. As can be seen from Examples 1 and 7-8, the type of active monomer can also affect the overall performance of the product to a certain extent; As can be seen from Examples 1, 9-13 and Comparative Examples 1-3, the type of curing agent also affects the overall performance of the product. When the type of curing agent in Comparative Examples 1-3 is not within the scope of this invention, the overall performance of the obtained product is significantly reduced.

[0054] Finally, it should be noted that the above embodiments are used to illustrate the technical solutions of the present invention and not to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A water-based UV-thermal dual-curing skin-feel coating, characterized in that, The coating comprises the following components by mass percentage: 60-80% waterborne UV-curable polyurethane resin, 5-10% reactive monomers, 2-4% photoinitiator, 0.1-2% additives, 3-8% film-forming agent, 5-15% fluorocarbon modified blocked curing agent, balance water; The functionality of the waterborne UV-curable polyurethane resin is 3-8; The fluorocarbon modified blocked curing agent is obtained by reacting polyisocyanate, blocking agent and long-chain fluorocarbon under the action of a catalyst; the long-chain fluorocarbon has more than 8 carbon atoms and includes hydroxyl groups.

2. The coating according to claim 1, characterized in that, The preparation method of the fluorocarbon modified blocked curing agent includes the following steps: S1. At 40-60℃, an acetone solution containing a blocking agent is added dropwise to a mixture of polyisocyanate and catalyst, and the reaction is carried out for 3-4 hours after the addition is completed. S2. After heating to 60-80℃, add dropwise an acetone solution containing long-chain fluorocarbons. After the addition is complete, react for 4-5 hours. After the reaction is complete, a fluorocarbon-modified blocked curing agent is obtained.

3. The coating according to claim 2, characterized in that, The molar ratio of active hydrogen in the blocking agent, catalyst, and isocyanate in the polyisocyanate is (0.7-0.8):(0.005-0.03):1; And / or, the molar ratio of active hydrogen in long-chain fluorocarbons to isocyanate in polyisocyanates is (0.3-0.4):1; And / or, in the acetone solution, the mass ratio of the sealing agent to acetone is (0.57-1.38):1; And / or, in the acetone solution of the long-chain fluorocarbon, the mass ratio of the long-chain fluorocarbon to acetone is (0.8-1):1.

5.

4. The coating according to claim 1, characterized in that, The polyisocyanate includes at least one of hexamethylene diisocyanate trimer, hexamethylene diisocyanate biuret, hexamethylene diisocyanate urea dione, pentamethylene pentane diisocyanate trimer, and isophorone diisocyanate trimer; And / or, the blocking agent includes at least one of acetone oxime, dibutylamine, and hexamethylenediamine; And / or, the catalyst includes an organotin catalyst; And / or, the long-chain fluorocarbon includes at least one of perfluorooctyl ethanol and hydroxyfluorosilicone oil.

5. The coating according to claim 4, characterized in that, The polyisocyanate includes hexamethylene diisocyanate trimer and isophorone diisocyanate trimer, wherein the molar ratio of hexamethylene diisocyanate trimer to isophorone diisocyanate trimer is 1:(4-6).

6. The coating according to claim 1, characterized in that, The active monomer includes at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, acryloyloxymorpholine, hexanediol diacrylate, triethoxylated trimethylolpropane triacrylate, and ethoxylated bis(trimethylolpropane)tetraacrylate.

7. The coating according to claim 6, characterized in that, The active monomers include hydroxyethyl methacrylate, acryloyloxymorpholine, and ethoxylated bis(trimethylolpropane)tetraacrylate, wherein the mass ratio of hydroxyethyl methacrylate, acryloyloxymorpholine, and ethoxylated bis(trimethylolpropane)tetraacrylate is (4-8):(2-4):

1.

8. The coating according to claim 1, characterized in that, The photoinitiator includes at least one of 1-hydroxycyclohexylphenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone, 2-hydroxy-2-methylphenylpropanone, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide; And / or, the film-forming agent includes at least one of propylene glycol methyl ether, dipropylene glycol methyl ether, dipropylene glycol n-butyl ether, propylene glycol n-butyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, and ethanol; And / or, the additives include at least one of leveling agents, wetting agents, defoamers, and thickeners.

9. The method for preparing the coating according to any one of claims 1-8, characterized in that, The preparation method includes the following steps: mixing the components and stirring at a speed of 600-800 r / min for 30-60 min, then filtering, collecting the filtrate, and obtaining the coating.

10. The application of the coating as described in any one of claims 1-8 in the preparation of 3C electronics, smart home decoration, and automotive interiors.

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