Preparation method of titanium dioxide self-cleaning film

Abstract

The invention provides a method for preparing a self-cleaning titanium dioxide film. The method comprises the following steps: (a) preparing n-titanic acid precipitate; (b) adding a structure-directing agent into the n-titanic acid precipitate, so as to form sol; (c) plating the transparent sol on a base material, and performing thermal treatment, thereby obtaining the self-cleaning titanium dioxide film with super hydrophilic performance. According to the method provided by the invention, a liquid phase method is adopted to add different structure-directing agents for preparing the titanium dioxide film, after thermal treatment, the film is uniform in surface distribution and excellent in hydrophilic performance, and a contact angle of the film and water in a dark room is less than 5 degrees. In addition, the visible light transmittance of the base material is barely affected. The raw materials used in the method are cheap, and the necessary equipment is simple and easy to operate.

Description

Technical field [0001] The invention relates to the technical field of self-cleaning membranes, in particular to a super-hydrophilic TiO 2 Film preparation method. Background technique [0002] TiO 2 Because of its photocatalytic degradation of organic stains, it is a good photocatalyst. Therefore, TiO is coated on the surface of glass and ceramics 2 The film, using its photocatalytic properties, can degrade the organic stains on the surface of the film under ultraviolet light, so as to achieve the purpose of self-cleaning, decontamination and easy cleaning. [0003] In recent years, TiO 2 A series of results have been achieved in the research on the super-hydrophilicity of the film. For example, the Chinese patent with publication number CN 101602933A adopts the sol-gel method, using tetrabutyl titanate, glacial acetic acid, anhydrous ethanol, etc. as reagents, and through doping with salts, a stable sol is obtained, and the crystal form is obtained by coating. Stable, self-clea...

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Problems solved by technology

For example, the Chinese patent with the publication number CN 101602933A adopts the sol-gel method, uses tetrabutyl titanate, glacial acetic acid, absolute ethanol, etc. as reagents, and obtains a stable sol by doping with salts, and obtains the crystal form by coating Stable, self-cleaning film with good self-cleaning ability, but the cost of raw materials used in this method is relatively high, which affects its popularization and application

The Chinese patent with the publication number CN 102168247A first uses magnetron sputtering technology to sputter TiO on the substrate 2 thin film, then sputtered TiO 2 Secondary deposition of WO on thin film 3 Thin film, to obtain a self-cleaning film with good controllability, but the coating efficiency is low, the coating thickness cannot reach a certain level, it is difficult to make the performance of the film meet the application index, and the required equipment is expensive and the operation cost is high

The Chinese patent with the publication number CN 102718411A discloses a natural superhydrophilic porous TiO 2 / SiO 2 Composite film and preparation method thereof, the method uses tetrabutyl titanate and tetraethyl orthosilicate as precursors, respectively prepares TiO by sol-gel method 2 Sol and SiO 2 The sol is compounded according to different molar ratios to obtain a self-cleaning film with excellent self-cleaning, anti-fog and antibacterial functions. Applications with higher requirements

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