Anti-scratch water-based dual-curing ultra-matte coating as well as preparation method and application thereof

Abstract

The invention discloses an anti-scratch water-based dual-curing ultra-matte coating and a preparation method and application thereof, and the anti-scratch water-based dual-curing ultra-matte coating is composed of a component A and a component B. The component A is prepared from the following raw materials in parts by weight: 60 to 70 parts of water-based dual-curing polyurethane acrylate resin, 10 to 15 parts of delustering agent, 3 to 4 parts of photoinitiator, 2 to 3 parts of hydroxyl modified polysiloxane emulsion and 5 to 20 parts of water; the delustering agent is a nano silicon dioxide aqueous dispersion. According to the matt paint, the appearance defects of poor surface scratch resistance, poor permeability, fogging, whitening, no friction resistance, brightening and the like of a coating after a large amount of matting agent is added into a matt paint product on the market at present are overcome.

Description

Technical Field

[0001] The invention belongs to the field of water-based coatings, and in particular relates to a scratch-resistant water-based dual-curing super-matte coating and a preparation method and application thereof. Background Art

[0002] In recent years, with the rapid development of the 3C electronics industry, the amount of coatings used to protect and decorate the surfaces of various products has increased. In particular, with the improvement of people's environmental awareness, the use of water-based coatings has continued to increase. Because super matte products have a strong texture, are soft and not dazzling, they can not only provide functional protection for products, but also enhance visual beauty, and have a low-key and luxurious appearance. Currently, matte coatings are dominant in the 3C field. Currently, matte coating products on the market, especially super matte coating products (60° angle: 1~1.5°), need to be adjusted by adding a large amount of matting agent to adjust the gloss. However, coatings with a large amount of matting agent usually have the disadvantages of poor permeability, fogging and whitening, and not scratch-resistant and shiny. Therefore, during the actual post-processing, transportation and use of the product, the coating surface is easily scratched by hard objects, destroying the arrangement of the matting agent particles, and the glossiness of the scratched area is improved, so scratching the coating surface will leave "bright marks", which seriously affects the appearance and user experience.

[0003] At present, there are many products on the market that need to be CNC processed after spraying. In order to avoid scratches on the products during CNC processing, it is necessary to spray a layer of protective ink or protective glue before CNC processing to protect the coating layer. However, such a process has many production steps and high costs. Therefore, the development of a scratch-resistant matte coating that does not require spraying protective oil is urgently needed in the market.

[0004] In addition, after 3C electronic products are assembled, they are generally protected with plastic bags or films before being packed in product packaging boxes to prevent scratches on the exterior during transportation. However, as people's awareness of environmental protection increases, major brand manufacturers are also gradually canceling plastic inner packaging, so the product coating surface is required to have good scratch resistance.

[0005] According to the above market conditions, there is an urgent need to develop a water-based super matte coating with excellent anti-scratch performance to meet market demand. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology, and provide a scratch-resistant water-based dual-curing super matte coating and its preparation method and application, so as to solve the problem that the existing water-based matte coating is easily scratched and shiny.

[0007] In order to solve the above technical problems, the technical solution proposed by the present invention is: A scratch-resistant water-based dual-curing super-matte coating consists of a component A and a component B. The raw materials for preparing the component A include the following components in parts by weight: 60-70 parts of a water-based dual-curing polyurethane acrylate resin, 10-15 parts of a matting agent, 3-4 parts of a photoinitiator, 2-3 parts of a hydroxyl-modified polyorganosiloxane emulsion, and 5-20 parts of water; the matting agent is a nano-silicon dioxide aqueous dispersion; and the component B includes a water-based isocyanate curing agent.

[0008] As a further improvement, the raw materials for preparing component A also include: 0.4-0.8 parts of thickener, 0.1-0.2 parts of defoamer, 1.0-2.0 parts of substrate wetting agent, 0.2-0.4 parts of dispersant, and 2-3 parts of cosolvent.

[0009] As a further improvement, the waterborne dual-curing polyurethane acrylate resin has a hydroxyl value of 40-46 mgKOH / g and a functionality of 4-6.

[0010] As a further improvement, the water-based dual-curing polyurethane acrylate resin adopts QDSRAYS UV601 from Sidon New Materials.

[0011] As a further improvement, the particle size of the nano-silicon dioxide aqueous dispersion is 10-20 nm.

[0012] As a further improvement, the nano-silicon dioxide aqueous dispersion adopts MOS-6010 from Pei Teng Material Technology.

[0013] As a further improvement, the hydroxyl-modified polyorganosiloxane emulsion contains active hydroxyl groups at both ends, which can react with isocyanate for cross-linking.

[0014] As a further improvement, the hydroxy-modified polysiloxane emulsion adopts Chuying New Material Technology M-3062B.

[0015] The present invention also provides a method for preparing the scratch-resistant water-based dual-curing super-matte coating, characterized in that the preparation of the A component includes: mixing a water-based dual-curing polyurethane acrylate resin, a thickener, a defoamer, a substrate wetting agent, a dispersant, a matting agent, a photoinitiator, a hydroxyl-modified polysiloxane emulsion, a cosolvent, and water to obtain the A component.

[0016] The present invention also provides an application of the scratch-resistant water-based dual-curing super-matte coating in preparing a coating for 3C electronic products.

[0017] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, water-based dual-cured polyurethane acrylate resin is matched with nano-silicon dioxide aqueous dispersion and hydroxyl-modified polyorganosiloxane emulsion. The three are combined in appropriate proportions and an appropriate amount of water-based isocyanate curing agent is added to prepare a dual-cured coating, which takes into account the advantages of PU coating toughness, excellent adhesion and UV coating high cross-linking density and excellent wear resistance and chemical resistance. By matching nano-silicon dioxide aqueous dispersion and hydroxyl-modified polyorganosiloxane emulsion, the coating has a good wrapping and fixing effect on nano-silicon dioxide particles and has good film thickness and hardness, surface scratch resistance and film permeability. It solves the appearance defects of the coating after adding a large amount of matte agent, such as poor surface scratch resistance, poor permeability, fogging and whitening, and not resistant to friction and shiny.

[0018] The coating prepared by the present invention can achieve the effect of no obvious scratches after 100 five-finger scratch resistance tests when the gloss is greater than 0.8° at an angle of 60°. Therefore, the process of spraying protective ink or protective glue on the matte coating before CNC machining and the practical problems that the products of major brand manufacturers are easily scratched after removing the plastic inner packaging of the products, and the surface is easily scratched and shiny during transportation and use are solved, which reduces the production, processing and packaging costs and greatly improves the decorative effect and protectiveness of the coating.

[0019] The coating formed by the present invention has a fast curing speed, which is conducive to improving production efficiency, and uses water as a diluent, which effectively reduces the VOC content in the coating, making the coating pollution-free during the spraying process, greatly improving the construction environment, and belonging to a green environmentally friendly product. In addition, the coating system is easy to make and has a wide range of applications. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and carefully in combination with preferred embodiments below, but the protection scope of the present invention is not limited to the following specific embodiments.

[0021] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0022] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0023] In some specific embodiments, the scratch-resistant water-based dual-curing super-matte coating of the present invention is composed of component A and component B. The raw materials for preparing component A include the following components in parts by weight: 60 to 70 parts of water-based dual-curing polyurethane acrylate resin, 0.4 to 0.8 parts of thickener, 0.1 to 0.2 parts of defoamer, 1.0 to 2.0 parts of substrate wetting agent, 0.2 to 0.4 parts of dispersant, 10 to 15 parts of matting agent, 3 to 4 parts of photoinitiator, 2 to 3 parts of hydroxyl-modified polysiloxane emulsion, 2 to 3 parts of cosolvent, and 5 to 20 parts of water.

[0024] Preferably, the raw materials for preparing component A include the following components in parts by weight: 65 parts of water-based dual-cure polyurethane acrylate resin, 0.5 parts of thickener, 0.2 parts of defoamer, 2 parts of substrate wetting agent, 0.3 parts of dispersant, 12 parts of nano-silica aqueous dispersion, 4 parts of photoinitiator, 3 parts of hydroxyl-modified polyorganosiloxane emulsion, 3 parts of cosolvent, and 10 parts of water.

[0025] In some embodiments, the water-based dual-curing polyurethane acrylate resin is a new type of dual-curing water-based polyurethane acrylate, which can be dual-cured by UV ultraviolet light and isocyanate curing agent. Specifically, the QDSRAYS UV601 resin of Sidon New Materials can be used, with a solid content of 40-45wt%, a hydroxyl value of 43 mgKOH / g, and a functionality of 4-6.

[0026] The water-based dual-curing polyurethane acrylate resin is the main formula, which has the dual-curing characteristics of PU and UV resin. It has the toughness and excellent adhesion of PU coatings, and also has the high cross-linking density and excellent wear resistance and chemical resistance of UV coatings. Its hydroxyl value is 43 mgKOH / g, and the functionality is 4-6. Under the irradiation of UV ultraviolet light, the photoinitiator excites free radicals and cations, which start chain initiation, triggering the polymerization and cross-linking reaction of the prepolymer in the resin. The polymerized macromolecules continue to undergo three-dimensional cross-linking reactions. When the free radical reaction completely loses its activity, the chain terminates to form a three-dimensional network polymer. The resin also contains hydroxyl groups that can react with the isocyanate curing agent in component B to form a three-dimensional network structure, providing a highly wear-resistant hardened coating. It has excellent adhesion performance on metals and plastics without spraying substrate treatment agents.

[0027] In some embodiments, the thickener is an aqueous nonionic polyurethane associative thickener having pseudoplastic fluid flow characteristics, specifically one of Vesmody U505 or U300 of Wanhua Chemical.

[0028] In some embodiments, the defoaming agent is a polyether silicone defoaming agent, specifically Foamex 810.

[0029] In some embodiments, the substrate wetting agent is a modified polyether siloxane copolymer, specifically one of BYK333 and BYK347.

[0030] In some embodiments, the dispersant is a non-ionic modified fatty acid derivative solution, specifically TEGO® Dispers 740 W.

[0031] In some embodiments, the matting agent is a nano-silicon dioxide aqueous dispersion, specifically MOS-6010 of Peiteng Material Technology, with an average particle size of 12nm and a solid content of 28-35wt%. An appropriate amount of nano-silica water dispersion is introduced into the formula, and the particle size is between 10-20nm. The nano-scale silica particles contained therein have been surface-modified and have good compatibility with the organic resin emulsion. At the same time, the dispersion can participate in the chemical cross-linking reaction and form a three-dimensional network inorganic skeleton structure after curing, thereby improving the hardness of the paint film. In addition, its nano-scale particle size enables it to form uniform and dense scattering centers in the coating, effectively enhancing the scattering effect of light, thereby significantly improving the matting effect of the coating. Compared with traditional matting agents, nano-silica matting agents can achieve better matting effects at a lower usage amount. While improving the matting effect of the coating, it has less interference with the transparency of the coating, because its nano-scale particle size makes its ability to scatter light mainly concentrated outside the visible light range, and has little effect on the transmittance of visible light, thereby ensuring good transparency of the coating, and the coating is more permeable, avoiding the problem of fogging and whitening of the coating.

[0032] In some embodiments, the photoinitiator is one of a cleavable acylphosphine oxide, a cleavable hydrogen abstraction type, and a cleavable α-hydroxy ketone derivative.

[0033] In some embodiments, the hydroxyl-modified polysiloxane emulsion is an emulsion containing active hydroxyl groups (R·C-OH) at both ends and capable of cross-linking with isocyanate, specifically Chuying New Material Technology M-3062B, which has a solid content of 70-76wt% and a hydroxyl value of 40 mgKOH / g.

[0034] The two ends of the hydroxyl-modified polysiloxane emulsion contain active hydroxyl groups, which can participate in the cross-linking reaction with the isocyanate in the B component to improve the cross-linking degree and hardness of the paint film. Its important role is to fix the nano-silica particles on the surface of the coating so that they are not destroyed and scraped off by external forces, thereby improving scratch resistance and preventing the appearance of "shiny" defects on the coating surface. It also has a certain matting effect and can reduce the amount of matting agent used.

[0035] In some embodiments, the co-solvent is an alcohol ether solvent, one or more of diethylene glycol butyl ether, dipropylene glycol butyl ether, dipropylene glycol methyl ether, and propylene glycol methyl ether.

[0036] In some specific embodiments, the method for preparing component A of the scratch-resistant water-based dual-cure super-matte coating of the present invention is to mix the above-mentioned weight parts of water-based dual-cure polyurethane acrylate resin, thickener, defoamer, substrate wetting agent, dispersant, matting agent, photoinitiator, hydroxyl-modified polysiloxane emulsion, cosolvent, and water.

[0037] In some embodiments, the method specifically includes the following steps: S1. Add a thickener, a substrate wetting agent, and a dispersant to the water-based dual-cure polyurethane acrylate resin in sequence under stirring at a speed of 700 to 900 rpm; S2. Add matting agent and stir at a speed of 800-1000 rpm for 10-15 minutes until the fineness is less than 10um; S3. Add the photoinitiator, hydroxyl-modified polyorganosiloxane emulsion, cosolvent and water in sequence while stirring at a speed of 800 to 1000 rpm, mix well and filter to obtain the product.

[0038] In some specific embodiments, the anti-scratch water-based dual-curing super matte coating component B of the present invention includes a curing agent and a solvent, wherein the mass percentage of the curing agent is 80-90%. The curing agent is preferably a water-based isocyanate curing agent, such as HDI aliphatic polyisocyanate curing agent, and the solvent can be propylene glycol diacetate.

[0039] In some specific embodiments, the present invention also provides the application of the above-mentioned anti-scratch water-based dual-curing super matte coating on plastic materials and metal substrates. The application method includes: mixing component A and component B and diluting them with deionized water (the mass ratio of the three is preferably 100:6~10:10~20), stirring and filtering, and then spraying them on the surface of the substrate, and after curing, a coating with a film thickness of 10-15μm can be obtained.

[0040] In some embodiments, the spraying pressure is 3-5 kgf / cm 2 , spraying environment temperature 20-30℃, humidity 40-60%RH.

[0041] In some embodiments, curing includes three stages: baking curing, UV curing, and additional baking. The baking curing temperature is 60-70°C, the time is 10-15 minutes, and the UV energy is 800-1200 mj / cm 2 、80~120mw / cm 2 After coming off the production line, the baking temperature / time is 65~75℃ / 2~3 hours or placed at room temperature 22~28℃ for 5 days.

[0042] The present invention effectively solves the appearance defects of the matte coating products currently on the market after adding a large amount of matting agent, such as surface scratch resistance, poor permeability, fogging, and friction resistance and shiny. The products using the coating of the present invention have excellent scratch resistance and wear resistance. Before CNC machining, there is no need to spray protective ink or protective glue to protect the product during the processing. In addition, the finished product does not need to be packaged and protected with a plastic bag or film separately, which reduces the production and processing and packaging costs and the pollution to the environment. In addition, the durability of the product in actual use is increased, and the consumer's experience is improved.

[0043] The following examples are only used to illustrate the present invention, but do not limit the scope of protection of the present invention.

[0044] Example 1 The scratch-resistant water-based dual-curing super-matte coating of this embodiment, component A includes the following components in parts by weight (Table 1): Table 1

[0045] The preparation method of component A comprises the following steps: S1, adding a thickener to a water-based dual-cure polyurethane acrylate resin while stirring at a stirring speed of 800 rpm to obtain a mixture A; S2, stirring at a speed of 800 rpm, adding defoamer, substrate wetting agent and dispersant to the mixed solution A while stirring to obtain a mixture B; S3, stirring at a speed of 1000 rpm, adding a matting agent to the mixed solution B while stirring, and dispersing it to a fineness of <10 μm to obtain a mixture C; S4, stirring at a speed of 800 rpm, adding a photoinitiator to the mixed solution C while stirring to obtain a mixture D; S5, stirring at a speed of 800 rpm, adding the hydroxy-modified polyorganosiloxane emulsion to the mixed solution D while stirring to obtain a mixture E; S6. The stirring speed is 800 rpm. The co-solvent and water are added to the mixed solution E while stirring, and the mixture is evenly mixed. The mixture is filtered through a 300-mesh sieve to obtain component A.

[0046] The composition of component B in this embodiment is: 85 parts of HDI aliphatic polyisocyanate curing agent and 15 parts of propylene glycol diacetate.

[0047] The preparation method of the above component B comprises the following steps: S1: HDI aliphatic polyisocyanate curing agent was introduced into a container, and propylene glycol diacetate solvent was added while stirring at 800 rpm.

[0048] S2: After stirring for 5 minutes, filter the mixture using a 300-mesh filter to obtain component B.

[0049] Example 2 The scratch-resistant water-based dual-curing super-matte coating of this embodiment, component A includes the following components in parts by weight (Table 2): Table 2

[0050] The preparation method of the above component A is the same as that of Example 1. The preparation method of the component B is the same as that of Example 1.

[0051] Example 3 The scratch-resistant water-based dual-curing super-matte coating of this embodiment, component A includes the following components in parts by weight (Table 3): Table 3

[0052] The preparation method of the above component A is the same as that of Example 1. The preparation method of the component B is the same as that of Example 1.

[0053] Comparative Example 1 Based on Example 1, the amount of hydroxy-modified polyorganosiloxane emulsion added was reduced to below the amount range.

[0054] The coating of this comparative example, component A includes the following components in parts by weight (Table 4): Table 4

[0055] The preparation method of the above component A is the same as that of Example 1. The preparation method of the component B is the same as that of Example 1.

[0056] Comparative Example 2 Based on Example 1, the amount of hydroxy-modified polyorganosiloxane emulsion is increased to be higher than the amount range.

[0057] The coating of this comparative example, component A includes the following components in parts by weight (Table 5): Table 5

[0058] The preparation method of the above component A is the same as that of Example 1. The preparation method of the component B is the same as that of Example 1.

[0059] Comparative Example 3 Based on Example 1, the matting agent of the nano-silicon dioxide aqueous dispersion was replaced with Tosoh E-1011 silica matting powder with an average particle size of 1.5 μm.

[0060] The coating of this comparative example, component A includes the following components in parts by weight (Table 6): Table 6

[0061] The preparation method of the above-mentioned component A comprises the following steps: S1, adding a thickener to a water-based dual-cure polyurethane acrylate resin while stirring at a stirring speed of 800 rpm to obtain a mixture A; S2, stirring at a speed of 800 rpm, adding defoamer, substrate wetting agent and dispersant to the mixed solution A while stirring to obtain a mixture B; S3, stirring at a speed of 1000 rpm, adding E-1011 silica matting powder to the mixed solution B while stirring, and dispersing it to a fineness of <15 μm to obtain a mixture C; S4, stirring at a speed of 800 rpm, adding a photoinitiator to the mixed solution C while stirring to obtain a mixture D; S5, stirring at a speed of 800 rpm, adding the hydroxy-modified polyorganosiloxane emulsion to the mixed solution D while stirring to obtain a mixture E; S6. The stirring speed is 800 rpm. The co-solvent and water are added to the mixed solution E while stirring, and the mixture is evenly mixed. The mixture is filtered through a 200-mesh sieve to obtain component A.

[0062] Component B is the same as in Example 1.

[0063] Comparative Example 4 On the basis of Comparative Example 3, the amount of hydroxyl-modified polyorganosiloxane emulsion was increased.

[0064] The coating of this comparative example, component A includes the following components in parts by weight (Table 7): Table 7

[0065] The preparation method of the above component A is the same as that of comparative example 3. The component B is the same as that of example 1.

[0066] Comparative Example 5 On the basis of Comparative Example 4, the amount of hydroxy-modified polyorganosiloxane emulsion was increased.

[0067] The coating of this comparative example, component A includes the following components in parts by weight (Table 8): Table 8

[0068] The preparation method of the above component A is the same as that of comparative example 3. The component B is the same as that of example 1.

[0069] In the above-mentioned Examples 1 to 3 and Comparative Examples 1 to 5, the coating component A and component B and deionized water were diluted and mixed in a mass ratio of 100:8:10-20, stirred at 300 rpm for 3 min, and filtered with a 300-mesh filter, and then sprayed on the surface of the plastic substrate or metal substrate wiped with alcohol, respectively, with a film thickness of 10-15 μm, and baked at a temperature of 60°C for 10 minutes, with a UV energy of 1000 mj / cm 2 , 100mw / cm 2 After curing, bake at 70 degrees for 2 hours to get a completely dry coating.

[0070] The coatings formed by the coatings of Examples 1 to 3 and Comparative Examples 1 to 5 were subjected to performance tests. The results are shown in Table 9.

[0071] Table 9

[0072] As can be seen from Table 9 above, Example 3 has the best comprehensive performance. The conventional and water-boiled adhesion are stable at 85 degrees for 2 hours and can reach the level 0 standard. The gloss is 0.9° and can meet the requirements of ultra-matte gloss. The pencil hardness is 500g / 2H without scratches. The RCA abrasion resistance is 350 times without showing the base material. The scratch resistance test is 100 times without obvious scratches. There is no blistering or discoloration after high temperature and high humidity test. The adhesion is not reduced and can reach the level 0 standard.

[0073] By comparing and verifying the addition amount of different hydroxyl-modified polyorganosiloxane emulsions in Examples 1 to 3 above, it is concluded that under the premise of consistent addition amount of nano-silica aqueous dispersion, when the hydroxyl-modified polyorganosiloxane emulsion is gradually increased within the parameter range, the hardness and RCA are improved, the hardness, RCA, and scratch resistance test performance are increased, the glossiness decreases, and the five-finger scratch test is qualified. By comparing and verifying the addition amount of different hydroxyl-modified polyorganosiloxane emulsions in Comparative Examples 1 and 2, it is concluded that when it is lower than the parameter range (Comparative Example 1), the hardness, RCA, and scratch resistance test performance decrease, the glossiness increases, and the five-finger scratch test is NG. On the contrary, when the hydroxyl-modified polyorganosiloxane emulsion is added above the parameter range (Comparative Example 2), the hardness, RCA, and scratch resistance test performance increase, the five-finger scratch test is qualified, but the water boiling adhesion test decreases. It shows that the hydroxyl-modified polyorganosiloxane emulsion has a significant fixing and wrapping effect on nano-silica, and has an enhancing effect on the overall hardness of the coating.

[0074] By using Comparative Examples 3, 4, and 5, the matting agent of the nano-silica aqueous dispersion was replaced with a common silica matting powder of E-1011 of Tosoh with a particle size of 1.5 μm, and different amounts of hydroxyl-modified polyorganosiloxane emulsion were compared and verified. It was found that when the amount of hydroxyl-modified polyorganosiloxane emulsion was within the parameter range (Comparative Examples 3 and 4), compared with Examples 1-3 and Comparative Examples 1-2, the appearance was foggy and the permeability was poor, and the hardness, RCA, and scratch resistance test performance all decreased. When the amount of hydroxyl-modified polyorganosiloxane emulsion was higher than the parameter, (Comparative Example 5), the hardness, RCA, and scratch resistance test performance increased, but the five-finger scratch test was NG and the water boiling adhesion test decreased. This shows that the ordinary matting powder is worse than the nano-silica aqueous dispersion in terms of scratch resistance and permeability. At the same time, with the increase of the proportion of hydroxyl-modified polysiloxane emulsion, the hardness, RCA and scratch resistance test performance increased, indicating that the hydroxyl-modified polysiloxane emulsion has an obvious fixing and wrapping effect on nano-silica and enhances the overall hardness of the coating.

[0075] Through the above embodiments and comparative examples, it can be concluded that the scratch-resistant water-based dual-curing super matte coating of the present invention, component A: water-based dual-curing polyurethane acrylate resin is matched with nano-silicon dioxide aqueous dispersion and hydroxyl-modified polysiloxane emulsion and wetting agent / dispersant / defoaming agent and other additives and solvents, and a coating formed by appropriate combination and matching with component B HDI aliphatic polyisocyanate curing agent can effectively solve the technical problems of super matte gloss (60° angle: 1-1.5°) surface being easily scratched, not scratch-resistant and shiny, fogging and poor permeability.

[0076] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A scratch-resistant water-based dual-curing super matte coating, which consists of component A and component B, characterized in that: The raw materials for preparing the A component include the following components in parts by weight: 60-70 parts of water-based dual-curing polyurethane acrylate resin, 10-15 parts of matting agent, 3-4 parts of photoinitiator, 2-3 parts of hydroxyl-modified polyorganosiloxane emulsion, and 5-20 parts of water; the matting agent is a nano-silicon dioxide aqueous dispersion; the B component includes a water-based isocyanate curing agent.

2. The scratch-resistant water-based dual-curing super-matte coating according to claim 1, characterized in that: The raw materials for preparing the A component also include: 0.4-0.8 parts of thickener, 0.1-0.2 parts of defoamer, 1.0-2.0 parts of substrate wetting agent, 0.2-0.4 parts of dispersant, and 2-3 parts of cosolvent.

3. The scratch-resistant water-based dual-curing super-matte coating according to claim 1 or 2, characterized in that: The waterborne dual-curing polyurethane acrylate resin has a hydroxyl value of 40-46 mgKOH / g and a functionality of 4-6.

4. The scratch-resistant water-based dual-curing super-matte coating according to claim 3, characterized in that: The water-based dual-curing polyurethane acrylate resin adopts QDSRAYS UV601 of Xidon New Material.

5. The scratch-resistant water-based dual-curing super-matte coating according to claim 1 or 2, characterized in that: The particle size of the nano silicon dioxide aqueous dispersion is 10-20 nm.

6. The scratch-resistant water-based dual-curing super-matte coating according to claim 5, characterized in that: The nano silicon dioxide aqueous dispersion adopts MOS-6010 from Peiteng Material Technology.

7. The scratch-resistant water-based dual-curing super-matte coating according to claim 1 or 2, characterized in that: The hydroxyl-modified polyorganosiloxane emulsion contains active hydroxyl groups at both ends and can react with isocyanate for cross-linking reaction.

8. The scratch-resistant water-based dual-curing super-matte coating according to claim 7, characterized in that: The hydroxy-modified polysiloxane emulsion adopts Chuying New Material Technology M-3062B.

9. A method for preparing the scratch-resistant water-based dual-curing super-matte coating according to any one of claims 1 to 8, characterized in that: The preparation of the A component includes: mixing a water-based dual-curing polyurethane acrylate resin, a thickener, a defoamer, a substrate wetting agent, a dispersant, a matting agent, a photoinitiator, a hydroxyl-modified polyorganosiloxane emulsion, a cosolvent, and water to obtain the A component.

10. Use of the scratch-resistant water-based dual-curing super-matte coating according to any one of claims 1 to 8 in preparing coatings for 3C electronic products.

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