Visible light photocatalytic functional surface coating for wood surface and preparation method thereof

Abstract

The invention discloses a visible light photocatalytic functional surface coating for the surface of woodware and a preparation method thereof. The visible light photocatalytic functional surface coating comprises the following components in percentage by weight: 1-10% of silica sol, titanium dioxide doped with noble metal ions Quantum dots 1‑10%, silicon nanoparticles 0.02‑2%, FeOOH nanoparticles 0‑2%, dispersants 0.1‑1%, thickeners 0.1‑1%, defoamers 0.1‑1%, leveling agents 0.1 ‑1%, anti-sedimentation agent 0.1‑1%, and the balance is water. Compared with traditional photocatalytic coatings, the visible light photocatalytic functional surface coating of the woodware surface of the present invention can significantly improve the photocatalytic effect of the coating, and can continuously and efficiently remove harmful substances such as formaldehyde, benzene, ammonia, TVOC and PM2.5, and clean indoor air. Air environment, outdoor smog removal, can also broad-spectrum kill bacteria, viruses, fungi, microorganisms, etc., and it is safe to use. Once painted, it can be used for a lifetime.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a visible light photocatalytic functional surface coating for wood surfaces 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 into ha...

AI Technical Summary

Problems solved by technology

However, titanium dioxide has a large band gap, and the photocatalyst has high catalytic activity only under the irradiation of ultraviolet light; for visible light of 400-700nm, which is the most important energy of sunlight, titanium dioxide has weak response and basically does not have catalytic activity in the visible light range. , the utilization rate of visible light is very low

[0004] In order to improve the responsiveness of titanium dioxide to visible light, the patent with the publication number CN102277051B proposes a method of doping titanium dioxide with non-metals such as carbon in the coating, but the visible light-responsive photocatalyst obtained in this way has weak light absorption ability , low catalytic activity, easy loss of doping elements, easy to cause loss of catalytic activity

Some literatures have proposed the method of adding photosensitizing dyes, but 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, and the life of photosensitizing dyes gradually weakens over time.

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 relative refractive index is generally only about 1.4-1.6. Coating substrate, 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 literatures that propose to add semiconductors with narrow bandgap widths such as cadmium sulfide and tin dioxide, but there is a certain degree of toxicity, which cannot meet environmental protection requirements.

[0005] In addition, for the existing photocatalytic coatings, because the light absorption is basically concentrated on the surface of the coating, the effect of photocatalytic degradation is limited.

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