Preparation method of high-stability neutral photocatalyst sol for cement-based material

Abstract

The invention belongs to the field of material science, and relates to a preparation method of a high-stability neutral photocatalyst sol for a cement-based material. The preparation method comprises the following steps of A, hydrolyzing a titanium salt, namely, adding an inorganic titanium salt as a raw material in an alkaline water solution for hydrolysis to obtain a white suspension; B, precipitating and filtering, namely, precipitating the white suspension obtained from the step A and washing multiple times; C, adding acid for peptizing, namely, adding a 0.1M dilute acid water solution in the obtained precipitate, thereby obtaining a bluish transparent TiO2 acidic sol; D, synthesizing the SiO2 sol, namely, hydrolyzing through dropping acid as a catalyst according to a mol ratio of tetraethoxysilane to alcohol of 1:24 in the alcohol to obtain an SiO2 sol; E, adding the SiO2 sol for improving the hydrophily in the bluish transparent TiO2 acidic sol obtained in the step C to obtain a mixed solution; and F, adding a prepared NaOH solution in the mixed sol obtained in the step D, and dispersing to an alcohol-water solution with a volume percent of 30-50 percent to obtain the high-stability neutral photocatalyst sol for the cement-based material.

Description

technical field [0001] The invention belongs to the field of material science and relates to a method for preparing a high-stable neutral photocatalyst sol for cement-based materials. Background technique [0002] Cement, as one of the most widely used inorganic non-metallic materials, has been widely used in public infrastructure such as buildings and roads. In recent years, the pollution of buildings will damage the image of companies, hotels, banks and restaurants, etc., so it takes a lot of money to maintain the appearance of the exterior walls. The most obvious pollutant is the dirt generated by the attachment of pollutants, and the pollutants come from the so-called urban pollution mainly composed of carbon and oil in the exhaust gas emitted by automobiles. [0003] The photocatalyst is mainly nano TiO 2 The representative semiconductor material with photocatalytic function is a general term. When the photocatalyst is applied to the surface of the substrate, the pho...

AI Technical Summary

Problems solved by technology

Chinese patent CN101049962A discloses a neutral nano-TiO 2 Sol preparation method, this method is to introduce H 2 o 2 As a complexing agent for Ti(OH) 4 Precipitation for degumming, but the TiO prepared by this method 2 Sol crystallization performance is poor, photocatalytic activity is poor

Chinese patent CN102432063A discloses a method for preparing a neutral nano-titanium dioxide hydrosol for functional fabrics. The method is to add a polymer modifier during the degumming process to obtain a neutral hydrosol. In the actual application process, polymer modifiers are easily destroyed by TiO 2 Photodegradation

In addition, Chinese patent CN101306838A also introduced highly stable neutral mixed crystal TiO 2 The preparation method of nanocrystals, but there is no introduction about the application in cement-based materials

Glass fiber cement-based materials (GRC) have broad application prospects in public buildings such as building roofs, building curtain walls, wall decoration, and municipal traffic engineering construction. In the early stage, our company has reported nanometer self-cleaning fiber reinforced cement in Chinese patent CN102518275 Products and their production methods, but there is no introduction on the detailed preparation of photocatalyst production

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