Preparation method of self-cleaning high-transmittance dual-layer antireflection coating sol

Abstract

The invention discloses a preparation method of self-cleaning high-transmittance dual-layer antireflection coating sol. The method comprises the following steps of: mixing alfol sol hydrolyzed from organic aluminum with sol obtained by co-hydrolysis of alkoxy silane and nano silicon dioxide under acidic catalysis so that the surface of the silicon diode particle is coated with a silicon-aluminum-alcohol glue; and coating a layer of TiO2 sol film layer on a solidified silicon-aluminum sol antireflection film by plating technologies, such as roller painting, spray coating and a dip-coating method. Since the TiO2 film has photocatalytic property and photo-induced super-hydrophilicity, organic pollutant adsorbed on the surface of the TiO2 film can be degraded under irradiation of sun light, and the pollutant and the dust can be washed away by rain, thus, the TiO2 coating layer has a self-cleaning function; the silicon-alcohol glue has better adhesion to the surface of substrate glass, the aluminum oxide sol is excellent in abrasion resistance; and with the dispersity of the silicon oxide particles, the coating film layer is porous, and the transmittance of the coating is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of nano-coating sol, in particular to a preparation method of self-cleaning high-transmittance double-layer anti-reflection coating sol. Background technique [0002] One of the reasons for the loss of solar energy conversion efficiency is that there is a reflection loss of about 10% on the glass surface for incident sunlight, so reducing the sunlight reflection on the glass surface is an effective way to improve solar energy conversion efficiency. One of the simplest and most effective ways to make glass have anti-reflection properties is to coat the surface of the glass with one or more layers of thin films, and use the interference of the thin films to reduce unnecessary reflections, thereby achieving anti-reflection effects. Compared with uncoated photovoltaic glass, the light transmittance of coated glass can be increased in the broadband range of 380-2500nm, and the light transmittance i...

AI Technical Summary

Problems solved by technology

The traditional method is to use the sol-gel method to prepare TiO 2 Sol and SiO 2 sol, then the TiO 2 Sol and SiO 2 Sol mixed together for coating, although the film prepared by this method has self-cleaning function, but the optical transmittance is poor, and it does not have good anti-reflection performance

Nano-SiO prepared by this traditional method 2 The film has large porosity and high surface energy, and is easy to absorb suspended matter in the surrounding environment. After a period of use, the light transmittance decreases significantly, which limits its practical application.

Or use the sol-gel method to coat a layer of nano-SiO on the surface of the photovoltaic glass. 2 film and a layer of nano-TiO 2 The double-layer anti-reflection film prepared by this method has self-cleaning function and good anti-reflection effect, but the mechanical strength of the coating layer is low, the friction resistance is poor, and the weather resistance is poor. Suitable for applications in the wild