A kind of polysiloxane/titanium sol photocatalytic composite film and preparation method thereof

Abstract

The invention discloses a polysiloxane / titanium sol photocatalytic composite film and a preparation method thereof. The preparation method comprises the following steps: after mixing terminal hydroxyl silicone oil, polymethylhydrosiloxane, a titanium sol and a solvent methylbenzene in certain amounts, dropwise adding a small amount of Karstedt platinum catalyst; initializing dehydrogenation condensation reaction between two types of silicon oil; after quickly and uniformly stirring, pouring into a polytetrafluoroethylene die; and gradually forming the film along with volatilization and condensation reaction of the solvent. The composite film disclosed by the invention is prepared from easily available raw materials, mild in preparation condition and simple in process and is suitable for large-scale industrialized production. In addition, the composite film is strong in controllability of structural morphology and can give consideration to property of ultraviolet resistance and photocatalytic performance of titanium sol particles, so that the composite film not only has an excellent ultraviolet shielding effect, but also has the functions of generating degraded organic matters, resisting and inhibiting bacteria, self-cleaning and the like due to the photocatalytic effect. The polysiloxane / titanium sol photocatalytic composite film can be used in the fields of textile, cosmetics, coatings, buildings, hygiene, medicines and the like.

Description

technical field [0001] The invention relates to the field of organic / inorganic composite membranes, in particular to a method of uniformly distributing titanium sol particles in a silicone oil solution whose main chain is a Si-O bond, and making it through the condensation reaction between silicone oils, three-dimensional crosslinking and volatilization of solvents Aging-resistant polysiloxane / titanium sol photocatalytic composite film and its preparation method. Background technique [0002] Due to the continuous development of nanomaterials science, functional nanoparticles as additives have become one of the research hotspots. Anatase Nano TiO 2 As an inorganic functional particle, it is used in textiles, coatings, construction, cosmetics, etc. Fields, so that textiles and carrier substrates can have continuous and stable UV shielding, bactericidal and antibacterial, degrading dirt, self-cleaning and other effects. [0003] For example, Gao Jianzhong [CN1560353A, Nano ...

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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 patent application whose publication number is CN101928517A (nano self-cleaning coating and its preparation method) discloses a method for physically blending anatase titanium sol and polysiloxane solution to prepare nano self-cleaning coating. The process does not involve the reaction between silicone oil molecules, and there is no construction of a three-dimensional crosslinking structure, so the mechanical, optical, photocatalytic and anti-aging properties of the coating itself are poor.

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