Formaldehyde-removing indoor decorative coating based on visible light catalysis

Abstract

The invention relates to a formaldehyde-removing interior decorative coating based on visible light catalysis. The coating comprises the following raw materials in percentage by weight: 20-35% of a coating matrix, 15-30% of a solvent, 0.5-3% of an auxiliary agent, 20-30% of a pigment filler and 10-20% of a photocatalyst, and the sum of the mass percentages of the raw materials is 100%. Wherein the photocatalyst is modified nano TiO2 powder, and the proper mass ratio of nano TiO2 particles to the sum of chromic nitrate and molybdenum nitrate can improve the photocatalytic performance of the coating, so that the degradation of formaldehyde is facilitated. The reasonable reaction temperature and time can ensure that the formed modified nano TiO2 powder is mainly spherical, the agglomeration phenomenon is avoided, the particle size distribution is uniform, the photocatalytic performance of the coating is better, and the formaldehyde purification efficiency is better. And the pigment filler is iron oxide red, talcum powder and silicon dioxide, and the iron oxide red, the talcum powder and the silicon dioxide can improve the activity and the chemical stability of the photocatalyst. The coating provided by the invention has a good degradation effect on formaldehyde, and has excellent comprehensive properties such as impact resistance, humidity resistance and the like.

Description

technical field [0001] The invention relates to a decorative coating, in particular to a formaldehyde-removing interior decorative coating based on visible light catalysis. Background technique [0002] Indoor decoration materials and furniture are increasingly becoming the main pollution source of the indoor environment, and formaldehyde (HCHO) is the most common substance in the pollution source. Formaldehyde is colorless and volatile. Long-term exposure to formaldehyde can lead to various chronic diseases. Formaldehyde is also listed as a carcinogen substance. Fluorescent lamps are often used indoors, which belong to visible light. It is of great significance to remove formaldehyde in an environment of visible light to improve air quality. [0003] At present, the use of photocatalysts to purify the air is a very promising method to improve the environment, TiO 2 、WO 3 etc. are common photocatalysts. Nano-TiO 2 It is non-toxic, stable in chemical properties, and has ...

AI Technical Summary

Problems solved by technology

However, TiO 2 It mainly absorbs ultraviolet light with a wavelength less than 384nm, and it is difficult to use visible light. Generally, it is necessary to treat TiO 2 Modified to make it use visible light, in order to improve the photocatalytic effect, but the modified TiO in the prior art 2 There are still problems such as insufficient utilization of visible light, poor effect on formaldehyde degradation, impact resistance, heat and humidity resistance and other performances are not good enough.

As in Patent Document 1 (CN110003693A), although TiO 2 Modification has been carried out, but the purification effect of formaldehyde is still unsatisfactory, and the impact resistance and heat and humidity resistance are also average.