Preparation method of titanium dioxide/polysiloxane photocatalytic composite film

Abstract

The invention discloses a preparation method of a titanium dioxide / polysiloxane photocatalytic composite film, which comprises the following steps: adding vinyl-terminated silicone oil, hydrogen-containing silicone oil and titanium sol into a film-forming solvent, uniformly mixing, adding a reinforcing agent silicon dioxide, uniformly mixing, adding a platinum catalyst to initiate silicon hydrogen addition reaction, pouring into a mold, and gradually forming the film along with the solvent volatilization and silicon hydrogen addition reaction, thereby obtaining the titanium dioxide / polysiloxane photocatalytic composite film. The method is simple in technique and easy to implement; the crosslinking level of the stereoscopic network structure of the composite film is controllable, and silicon dioxide granules can be uniformly and stably dispersed in the composite film in the form of primary particles and can be easily enriched and embedded in the surface layer of the composite film; and the composite film has the advantages of favorable mechanical strength and obvious ultraviolet shielding effect, has excellent photocatalytic functions of resisting bacteria, degrading organic substances and the like, and can be used in the fields of textiles, paints, buildings, cosmetics, sanitation, medicine and the like.

Description

technical field [0001] The invention relates to an organic / inorganic composite film in the field of polymer chemical industry and its preparation method, in particular to a method of uniformly distributing titanium sol particles in a silicone oil solution, and preparing titanium dioxide / polysiloxane through crosslinking of silicone oil molecules and solvent volatilization A method for photocatalytic composite membranes. Background technique [0002] Anatase Nano TiO 2 Non-toxic and tasteless, strong stability, good UV shielding and visible light transmission, excellent photocatalytic ability, it can be used in textiles, coatings, construction, cosmetics, hygiene, medicine and other fields under the action of adhesive adhesion, which can endow Continuous and stable UV shielding, bactericidal and antibacterial, degrading dirt, self-cleaning and other effects for the target object. However, in recent years, more and more studies have shown that anatase TiO 2 The high-energy ...

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Problems solved by technology

However, the titanium sol particles produced under this system are mainly amorphous, and their photocatalytic and UV shielding capabilities are poor.

[0005] In addition, the Chinese invention patent application with publication number CN101928517A discloses a method of physically blending anatase titanium sol and polysiloxane solution to prepare nanometer self-cleaning coatings. The process described in this method does not involve the reaction between silicone oil molecules , and there is no three-dimensional cross-linking structure, so the mechanical properties of the coating itself are not good, so it can only be used for coating

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