A kind of water-based environmental protection wear-resistant organic-inorganic hybrid anti-fog coating and preparation thereof

Abstract

The invention relates to the field of anti-fog coatings, in particular to a water-based environmental protection wear-resistant organic-inorganic hybrid anti-fog coating. The present invention uses water-based polyurethane-acrylic resin and modified TiO 2 / SiO 2 Hybrid microspheres as the main body, compounded with reactive diluent, polyacrylamide, leveling agent, etc.; the coating prepared by this method uses water and alcohol as composite solvent, and has low volatile organic compound (VOC) content, which is environmentally friendly. coating. After the anti-fog coating provided by the present invention is cured by UV light, the coating has high hardness, good soaking resistance, wear resistance and long-lasting anti-fogging performance, and is suitable for fields with anti-fogging requirements, such as goggles, Swimming goggles, lamp shades, bathroom mirrors, etc.

Description

technical field [0001] The invention relates to the field of anti-fog coatings, in particular to a water-based environmental protection wear-resistant organic-inorganic hybrid anti-fog coating. Background technique [0002] Fogging is a common natural phenomenon in daily life. The reason is that when the temperature reaches or approaches the dew point temperature, the water vapor in the air will condense into tiny dew droplets to form a fog layer. The fogging phenomenon on the surface of transparent materials can not only lead to a serious decrease in light transmittance, but sometimes even have major safety hazards. The absorption rate of solar energy will reduce the crop yield or the power generation rate of solar panels. When fogging occurs on medical goggles or motorcycle helmets, it will seriously affect the field of vision and pose a major safety hazard. In order to prevent the occurrence of the above fogging phenomenon, people have adopted a variety of anti-fogging m...

AI Technical Summary

Problems solved by technology

The atomization phenomenon on the surface of transparent materials can not only lead to a serious drop in light transmittance, but sometimes even pose a major safety hazard. The absorption rate of solar energy will reduce the yield of crops or the power generation rate of solar panels; when fogging occurs on medical goggles or motorcycle helmets, it will seriously affect the field of vision and pose a major safety hazard

In order to prevent the occurrence of the above-mentioned fogging phenomenon, people have adopted a variety of anti-fogging measures, the common ones are (1) heating method, by heating to keep the temperature of the surface of the transparent material higher than the dew point, so as to prevent fogging, but this method is costly , strong limitations, not suitable for large-scale promotion and use

(2) Hydrophilic or hydrophobic treatment is carried out on the surface of the material. Polymer resins containing silicon and fluorine are generally used for hydrophobic treatment, which is difficult to form a film, complicated in process, and expensive in cost. Atomization occurs, so it is rarely used in daily life; hydrophilic treatment can improve the wetting performance of the entire material surface, which is conducive to the spreading of small water droplets on its surface, so it has good anti-fog performance, but the traditional hydrophilic anti-fog The coating has the following problems: a. Generally, volatile solvents such as esters and ethers are used. On the one hand, it will cause greater environmental pollution during the film formation process, and on the other hand, it will increase the production cost of the coating and the preparation process of the coating film. Cost; b. The anti-fog layer has problems such as poor wear resistance, low hardness, and poor immersion resistance

The coating is cured by heat first, and then cured by light. The anti-fog layer obtained has good anti-fog durability and wear resistance, but the curing process is complicated. At the same time, the solvent of the coating is propylene glycol butyl ether, ethylene glycol butyl ether , propylene glycol methyl ether acetate, alcohol ester-12, propylene glycol phenyl ether, benzyl alcohol, etc., cause environmental pollution and waste of resources in the film-making process; Cured anti-fog coating, although the anti-fog film prepared by the coating has good initial anti-fog effect and long-lasting anti-fog performance, but because it is a pure polymer anti-fog film, the hardness of the anti-fog film is low, The wear resistance is poor; the hydrophilic polymer anti-fog coating disclosed in the patent CN1321164C uses ethylene glycol monomethyl ether or ethylene glycol monoethyl ether as a solvent, which not only has high cost, but also will Cause air pollution, the anti-fog film surface has poor wear resistance and low hardness, which limits its scope of use

Patent CN111607320A provides a water-based polyurethane-silica sol composite antifogging agent, in which the main chain segment of water-based polyurethane is PEG, and there are problems of weak bonding and insufficient smoothness on different substrates during the actual film forming process. Hydrophilic silica microspheres are prone to micropore blockage during use and the double bond on the surface is not adjusted, resulting in excessive cross-linking and decreased hydrophilic performance; patent CN201210419958.5 uses nano-SiO 2 As the core material, TiO 2 As the shell material, the process in the actual preparation process is relatively complicated, and SiO 2 After being coated, the actual hydrophilic effect will be greatly reduced

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