Transparent self-cleaning SiO2 anti-fogging coating and preparation method thereof

Abstract

The invention belongs to the technical field of nano materials, and relates to a transparent self-cleaning SiO2 anti-fogging coating and a preparation method thereof. A static self-assembly method is adopted, and hierarchical mesoporous SiO2 nanoparticles and polyelectrolyte are alternately assembled to form the super hydrophilic or hydrophobic transparent self-cleaning SiO2 anti-fogging coating.The coating consisting of the hierarchical mesoporous SiO2 nanoparticles has a hierarchical porous structure and a hierarchical rough structure on the surface; and the hierarchical mesopores of the hierarchical mesoporous SiO2 nanoparticles are positioned on the surfaces of the hierarchical mesoporous SiO2 nanoparticles, and comprise 2-5nm mesopores enclosed by amorphous silicon dioxide frameworkstructures and 5-30nm mesopores enclosed by amorphous silicon dioxide framework structures. Because of the hierarchical mesopores of the hierarchical mesoporous SiO2 nanoparticles and pores among thehierarchical mesopores, the transmittance of a glass plate coated with the hierarchical mesoporous SiO2 nanoparticles is improved from 90.4 percent to 92.0 percent.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to transparent self-cleaning SiO 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, so as not to affect mirror imaging, visibility and The effect of light transmittance of glass. [0004] Self-cleaning glass is mainly divided into two cate...

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

Images