Anti-reflective superhydrophilic self-cleaning SiO2 anti-fog coating and preparation method thereof

Abstract

The invention relates to an anti-reflective superhydrophilic self-cleaning SiO2 anti-fog coating and a preparation method thereof. According to the invention, by using an electrostatic self-assembly method, mesoporous SiO2 hollow balls, which have a particle size of 49 to 100 nm and dual shells, with an outer shell being thin and poreless and an inner shell having mesopores, and polyelectrolyte are alternatively assembled and are cumulated on a glass surface so as to form the anti-reflective superhydrophilic self-cleaning SiO2 anti-fog coating, and the surface of the coating has a nanometer-scale rough structure. For the glass on which the mesoporous SiO2 hollow balls with the thin and poreless outer shell and the mesoporous inner shell are deposited, light transmittance during beam focusing is as high as 96.0%, substantially improved compared to light transmittance of 90.0% of an original glass substrate, and reflectance during beam focusing is as low as 2.5%, greatly reduced compared to reflectance of 8% of the original glass substrate.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanomaterials, in particular to mesoporous SiO with a thin and non-porous outer shell and a mesoporous double shell in the inner shell. 2 Anti-reflective superhydrophilic self-cleaning SiO composed of hollow spheres 2 Anti-fog coating and its preparation method. Background technique [0002] Self-cleaning glass (Self-cleaning glass) refers to the special physical or chemical treatment of ordinary glass, which produces unique physical and chemical properties on the surface, so that the glass can achieve cleaning effect without traditional manual scrubbing methods. Glass. [0003] Glass fogging refers to the condensation of moisture or steam on the surface of glass products to form tiny water droplets. Anti-fogging glass refers to the special treatment of ordinary glass to make the surface super-hydrophilic, so that the tiny water droplets formed due to atomization can be quickly flattened...

AI Technical Summary

Problems solved by technology

However, these methods have their own limitations: method (1) needs to repeatedly spray surface-active agent on a regular basis and seems inconvenient; method (2) causes glass products to have poor abrasion resistance and heat resistance due to the use of organic substances; method ( In 3), it usually takes 7 to 10 minutes to heat and evaporate water droplets, and the timeliness is poor, and additional energy is required, which consumes a lot of energy, so it is not practical; the device of method (4) is more complicated, has many components, and the cost is high (Liu Fu Shengcong, Li Yuping National Scientific and technological journal of building materials - "Glass" 2002, No. 3, 16-19)

Unfortunately the technology uses TiO 2 The photocatalytic properties to improve the hydrophilicity of the surface of the substrate must show good hydrophilicity in an environment irradiated by ultraviolet light. It is difficult to achieve this effect in a dark environment, and it has not achieved true Significantly superhydrophilic (contact angle less than 5 degrees), thus limiting its scope of application

In general, the self-cleaning and anti-fog effects and durability of these current technologies are not ideal

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