Method for preparing nanometer titanium dioxide super-hydrophobic film

Abstract

Disclosed is a method for preparing a nanometer titanium dioxide super-hydrophobic film. Nanometer titanium dioxide is prepared by a hydrothermal method, on basis of hydrolysis reaction, titanium n-propoxide with hydrolysis reaction under natural conditions is selected as a titanium source, nanometer titanium dioxide with good crystal form is obtained through controlling of reaction conditions and used for preparing a composite material, anatase-type crystal form is used for preparing a super-hydrophobic thin film, and then the super-hydrophobic thin film is formed after modification by low surface energy substance stearic acid. The method for preparing the nanometer titanium dioxide super-hydrophobic film has the advantages that the method is low in preparation costs, simple and rapid, a contact angle of the prepared super-hydrophobic film is water contact angle of hydrophobic nanometer titanium dioxide, which is 95.3 degrees, rolling angle is 0-4 degrees, grain size of nanometer titanium dioxide is about 7nm, grain dispersibility and stability are good, effects are still good though the nanometer titanium dioxide super-hydrophobic film is put in air for a period of time, acidic and alkali resistance is good, and the nanometer titanium dioxide super-hydrophobic film can be used for resisting water, freezing and metallic corrosion.

Description

technical field [0001] The invention relates to the preparation of a super-hydrophobic film, in particular to a preparation method of a nano-titanium dioxide super-hydrophobic film. Background technique [0002] In recent years, with extensive research on wettability, people have realized that superhydrophobic membranes have huge potential applications in self-cleaning, microfluidic systems and special separations, so the preparation of superhydrophobic membranes has also become the focus of attention. . According to the classical Young's equation, the surface energy directly determines the wettability of the surface. To improve the hydrophobicity, the surface energy of the surface substance must be reduced as much as possible. Although low surface energy substances can enhance the hydrophobicity of the membrane surface, it still cannot exceed 120°. On the other hand, the rough surface structure is also closely related to the hydrophobicity of the membrane. Therefore, redu...

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Problems solved by technology

However, most of these methods have high production costs, complicated processes, and harsh experimental conditions, making it difficult to manufacture on a large scale, which limits their application.

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