Preparation of silastic surface hydrophobic coating

Abstract

The invention discloses a preparation method of hydrophobic coating on the surface of silicon rubber. The method comprises the following steps: tetraethyl orthosilicate is taken as a precursor, anhydrous alcohol is taken as a solvent so as to prepare silicon dioxide sol under the condition of alkaline catalysis, and the obtained silicon dioxide sol is added with a silane coupling agent for modification process; after the surface is cleaned, a silicone rubber insulator is dipped in the modified silicon dioxide sol to carry out film coating with a pulling method so as to form a one-time coating and obtain a micro-nanometer rough structure which is similar to the leaf of taro; and after dried, the nanometer rough structure is again dripped in self-made fluorosilane sol for a secondary film coating with the pulling method, and then placed in an oven for thermal processing under 100 DEG C to 120 DEG C. The one-time coated micro-nanometer rough structure can obtain the transparent hydrophobic coating with acid and alkali resistance, after being modified by the secondary coating with low-surface fluorosilane sol.

Description

technical field

[0001] The invention relates to a method for preparing a hydrophobic interface, in particular to a method for preparing a high-voltage silicone rubber insulator coating that can improve surface hydrophobicity in an acid-base environment. Background technique

[0002] Hydrophobic coatings have self-cleaning properties and are widely used. In recent years, people have paid more and more attention to the research of hydrophobic coatings on the surface of materials, and many superhydrophobic (surface static contact angles greater than 150 degrees) coatings have been prepared. However, some preparation methods of these coatings are complex and some are expensive. And these coatings all have super-hydrophobic properties in a neutral environment, but there are no public reports on the coatings that still maintain good super-hydrophobic properties in an acid-base environment. Such as the coating on the surface of silicone rubber used on high-voltage insulators, espe...

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