Visible photocatalysis functional topcoat with quantum dots and preparation method of visible photocatalysis functional topcoat

Abstract

The invention discloses a visible photocatalysis functional topcoat with quantum dots and a preparation method of the visible photocatalysis functional topcoat. The visible photocatalysis functional topcoat comprises the following components in percentage by weight: 1-10% of a silicate coating resin, 1-10% of noble metal ion doped titanium dioxide quantum dots, 0.02-2% of silicon nanoparticles, 0-1% of FeOOH nanoparticles, 0.1-1% of a leveling agent, 0.1-1% of a dispersant, 0.1-1% of a thickening agent, 0.1-1% of a defoaming agent and the balance of water. Compared with a conventional photocatalysis coating, the visible photocatalysis functional topcoat with the quantum dots is capable of remarkably improving a photocatalysis effect, continuously and efficiently removing harmful substancessuch as formaldehyde, benzene, ammonia, TVOCs (total volatile organic compounds) and PM2.5 and purifying indoor air environments and outdoor haze elimination, and killing bacteria, viruses, fungi, microorganisms in a broad spectrum, can be used temporarily once being used, and in addition is safe to use.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a visible light photocatalytic functional surface coating containing quantum dots and a preparation method thereof. Background technique [0002] Since photochemist Akira Fujishima discovered the photodecomposition of titanium dioxide single crystals in water under ultraviolet light in 1972, photocatalysis has gradually become a new type of green and environmentally friendly environmental pollution cleaning technology. Using the photocatalyst to absorb light, the electrons on the surface of the photocatalyst absorb enough energy to detach, and form positively charged holes at the position where the electrons detach, and the electrons and holes react with oxygen, water, and hydroxyl to generate superoxide with strong oxidative properties. Ions and hydroxyl radicals with strong reducing properties, superoxide ions and hydroxyl radicals oxidize and decompose organic pollutants and bacteria i...

AI Technical Summary

Problems solved by technology

[0004] In order to improve the responsiveness of titanium dioxide to visible light, the patents whose publication numbers are CN101153137A and CN100335578C propose a method of adding metal or doping nonmetals to titanium dioxide, but the visible light-responsive photocatalyst obtained in this way has weak light absorption ability, The catalytic activity is low, and the use of precious metals will increase the cost, and the doping elements are easy to lose, which will easily lead to the loss of catalytic activity

There are also literatures that propose the method of adding photosensitizing dyes, but in this method, photosensitizing dyes are organic substances, and their chemical bonds will also disintegrate under the action of photocatalysis, so the responsiveness to visible light is not durable. As time goes by, photosensitizing dyes lifespan gradually diminishes

In addition, the patent with the publication number CN1013756376B proposes to add semiconductors with narrow bandgap width such as modified iron oxide to realize the absorption of visible light. The refractive index of iron oxide materials is high, generally 2.8-2.9, and the contrast refractive index is generally only 1.4 For coating substrates around -1.6, iron oxide particles strongly scatter visible light, so there is a defect that although visible light can be absorbed, the photocatalytic activity is not high when exposed to visible light

In addition, there are also literatures that propose to add semiconductors with narrow band gaps such as cadmium sulfide and tin dioxide, but cadmium sulfide and tin dioxide have certain toxicity and cannot meet environmental protection requirements.

In addition, the photocatalytic effect of these coatings is mainly concentrated on the surface of the coating because the light absorption is basically concentrated, so the effect of photocatalytic degradation is limited.

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