Super-hydrophilic anti-fog coating for glass and preparation method thereof

Abstract

The invention discloses a super-hydrophilic anti-fog coating for glass. The coating is prepared from alkaline silicate, silica sol, a silane coupling agent, a thickener, a defoamer and the like. By taking super-hydrophilic alkaline silicate and silica sol as main raw materials, the super-hydrophilic, atomization-resistant, long-durable, highly water-resistant and high-hardness super-hydrophilic anti-fog coating for glass capable of being cured at normal temperature is prepared by virtue of compound reactions. The process is simple, low in cost and environment-friendly; the operating conditions are easily controlled, the problem that the existing coating is poor in atomization-resistant effect and durability and complex in preparation process is solved, the application and development of a super-hydrophilic technique are promoted.

Description

technical field [0001] The invention relates to the technical field of coating materials, in particular to a superhydrophilic anti-fog coating for glass and a preparation method thereof. Background technique [0002] Glass atomization refers to the condensation of moisture or steam on the surface of glass products to form tiny water droplets. The precipitation of tiny water droplets causes diffuse reflection when light passes through, thereby significantly reducing the light transmittance of the glass, and fogging occurs, making the glass become Opaque, affecting visual effects. The fogging phenomenon on the glass surface will bring a lot of inconvenience to daily production and life, such as: glass windows of buildings, bathroom mirrors, spectacle lenses, test lenses of instruments, etc., especially when the windshield of a vehicle is fogged in a cold environment, It will bring serious harm to driving safety and personal safety. For this phenomenon, the more commonly used...

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Problems solved by technology

[0002]Atomization of glass refers to the condensation of moisture or steam on the surface of glass products to form tiny water droplets. The light transmittance of the glass, the phenomenon of fogging occurs, making the glass opaque and affecting the visual effect

The fogging phenomenon on the glass surface will bring a lot of inconvenience to daily production and life, such as: glass windows of buildings, bathroom mirrors, spectacle lenses, test lenses of instruments, etc., especially when the windshield of a vehicle is fogged in a cold environment, Serious harm to driving safety and personal safety

For this phenomenon, the more commonly used methods on the market are: (1) spraying surfactant method to make the glass surface hydrophilic; (2) coating polymer film method to make the glass surface hydrophobic; (3) installing a heating device to make the glass surface The surface temperature is higher than the dew point. However, these methods have their own limitations: (1) The stability of the surfactant is poor, and it needs to be sprayed repeatedly on a regular basis. The wear resistance and heat resistance of the surface of the product are not good, and the product needs to be coated before leaving the factory, which is not easy to implement before; (3) It takes a long time to heat and evaporate water droplets, which is expensive, easy to damage, and not easy practical

However, TiO2-based film glass products cannot function in places where there is no light or weak light. Even if there is light, it needs to be irradiated for more than 2 hours to obtain super-hydrophilic effect; The stability of the photocatalytic performance of the film on the glass surface is not good, and it is easy to reduce the photocatalytic activity or even deactivate due to the accumulation of environmental foreign matter on the surface

In addition, the introduction of inorganic nanomaterials, hydrophilic polymer materials and surfactants on the glass surface through sol-gel, electrochemical, redox, template preparation and other methods can also increase the surface energy and wettability. , to improve the hydrophilicity of the glass surface. However, most of these methods require the use of expensive equipment or complex processes, making it difficult to prepare low-cost and high-efficiency superhydrophilic surfaces.

[0004] Currently limited by the preparation method, the mechanical strength of the material surface microstructure, the anti-fog effect and the unsatisfactory durability, the preparation of the surface of super-hydrophilic materials is still lacking. Simple, economical and environmentally friendly method

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