Titanium oxide sol, titanium oxide sol coat film and forming method

Abstract

Provided is a titanium oxide sol solution which is usable as a coating agent or its starting material having functions such as prevention of contamination, deodorization, clouding resistance, and antimicrobial activity. The titanium oxide sol contains negatively charged amorphous titanium oxide particles and titanium oxide particles responsive to a visible light of 50-99 pts.mass in total, >=1 kind(s) of anionic compound(s) selected from condensed phosphoric acid, condensed phosphates, and chelate compounds having carboxy groups of 1-50 pts.mass in total, and a solvent, and its pH is 5-10. In addition, a specific basic compound, an antioxidant, etc., can be contained. The titanium oxide coating film is formed by adhering the titanium oxide sol, volatilizing the solvent, heating at a temperature of >=200[deg.]C and then irradiating an electromagnetic wave with a wavelength of <650 nm.

Description

technical field [0001] The present invention relates to a colloidal sol of visible light-responsive titanium dioxide used as a photocatalyst that functions when irradiated with visible light. Titanium oxide sol solution used as its raw material. Background technique [0002] Traditionally, ceramic coatings with better heat and wear resistance than organic coatings include alkali metal silicate-based, phosphate-based, silica sol-based, and metal oxide-based coatings. [0003] These coatings have the characteristics of inorganic coatings with good heat resistance and wear resistance, but in recent years, they have turned to metal oxide systems that have new performances in ceramic protective films (films). [0004] Among various ceramics, titanium oxide can also exhibit an excellent photocatalytic effect, and exhibit high oxidation ability after ultraviolet irradiation. [0005] Therefore, it is generally known that after titanium oxide with good photocatalytic performance i...

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Problems solved by technology

[0009] However, the above-mentioned sol-gel method, the use of acid solution gel, dispersion and other methods, because the colloid solution is acidic, not only the problems of corrosion and material degradation when coating on the surface of metal and paper, etc., the visible light developed in recent years Responsive TiO2-based photocatalysts also have the problem that visible light photocatalysts are oxidized, and the reactivity to visible light is easily deteriorated.