Photocatalysis cleaning coating for exterior wall

Abstract

The invention discloses a photocatalysis cleaning coating for an exterior wall. The photocatalysis cleaning coating comprises, by mass, 3-8 parts of bismuth oxyhalide photocatalysis powder, 0.5-1.0 part of nano titanium dioxide sol, 50-55 parts of waterborne silicon acrylic emulsion, 5-10 parts of waterborne wetting and dispersing agent, 0.02-1.0 part of waterborne defoamer, 2-4 parts of film forming aid, 0.5-1.2 parts of waterborne flatting agent, 0.2-0.5 part of corrosion inhibitor, 0.02-0.1 part of mildew preventive agent and 20-25 parts of water. A novel photocatalyst is prepared by combining titanium dioxide with bismuth oxyhalide, so that photocatalysis efficiency of nano titanium dioxide can be improved remarkably, and the photocatalysis cleaning coating has efficient and pollution-free antibacterial and bactericidal effects and a function of degrading organic pollutants in air under irradiation of indoor natural light or sunlight.

Description

technical field [0001] The invention relates to a photocatalytic coating, in particular to a photocatalytic cleaning coating for exterior walls. Background technique [0002] Due to its good photocatalytic activity, nano-titanium dioxide has made great progress in the degradation of organic pollutants, sewage treatment, air purification, etc. Photocatalytic oxidation technology is considered to be the most promising technology to solve the problem of persistent organic pollution One of them has been widely studied at home and abroad in recent years. The holes on the surface of titanium dioxide can react with the adsorbed water molecules or hydroxyl groups to generate hydroxyl radicals with extremely high reactivity. Hydroxyl radicals have a reaction energy of 402.8MJ / mol, which is higher than the energy of various chemical bonds in organic compounds, so they can trigger the oxidation reaction of most organic compound molecules, and further mineralize to generate CO2 and H2O...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that titanium dioxide can only respond to ultraviolet light with a wavelength of less than 400nm, has low photocatalytic efficiency, absorbs less visible light, and cannot effectively sterilize and degrade toxic air pollutants under natural light indoors. The purpose is to provide a Photocatalytic cleaning coatings for exterior walls, combining titanium dioxide and bismuth oxyhalide to prepare a new type of photocatalyst, which can significantly improve the photocatalytic efficiency of nano-titanium dioxide, and at the same time have high efficiency and no pollution under natural light or sunlight indoors The function of antibacterial and sterilizing and degrading organic pollutants in the air