Preparation of silastic surface hydrophobic coating

A technology of hydrophobicity and silicone rubber, applied in the field of preparation of hydrophobic interface, can solve the problems of high cost, no public report, complicated preparation method, etc.

A technology of hydrophobicity and silicone rubber, applied in the field of preparation of hydrophobic interface, can solve the problems of high cost, no public report, complicated preparation method, etc.

CN101434709AInactive Publication Date: 2009-05-20西安智源电缆料有限公司
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  • Preparation of silastic surface hydrophobic coating

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Experimental program
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Embodiment 1

[0017] (1) Using tetraethyl orthosilicate (TEOS) as the precursor and absolute ethanol as the flux, under the condition of alkaline catalysis, according to the quality of tetraethyl orthosilicate: absolute ethanol: ammonia water = 1:20:1 After mixing, stir at 65°C to prepare silica sol;

[0018] (2) modifying the silica sol in step (1), adding 7wt% silane coupling agent, stirring at room temperature, and then performing vacuum defoaming treatment;

[0019] (3) Clean the surface of the silicone rubber insulator, dip it in a methanol solution containing 3wt% N-β-aminoethyl-γ-aminopropylmethyldimethoxysilane for 5 minutes, take it out and dry it naturally;

[0020] (4) Carry out pull-coating coating on the silicon rubber insulator in the silica sol modified in step (2), form a coating on the surface of the porcelain insulator, put it into an oven for heat treatment at 100 degrees Celsius after natural drying;

[0021] (5) Mix trimethylchlorosilane (TMCS), hydrofluorosilicic acid...

Embodiment 2

[0024] (1) Using tetraethyl orthosilicate (TEOS) as the precursor and absolute ethanol as the flux, under the condition of alkaline catalysis, according to the quality of tetraethyl orthosilicate: absolute ethanol: ammonia water = 1:20:1 After mixing, stir at 30°C to prepare silica sol;

[0025] (2) Carry out modification treatment to the silica sol of step (1), add 5wt% of N-β-aminoethyl-γ-aminopropyltrimethoxysilane, stir at room temperature, and then carry out vacuum defoaming deal with;

[0026] (3) Clean the surface of the silicone rubber insulator, dip it in a methanol solution containing 3wt% N-β-aminoethyl-γ-aminopropyltrimethoxysilane for 5 minutes, take it out and dry it naturally;

[0027] (4) Carry out pull method coating on the silicon rubber insulator in the silica sol modified in step (2), form a coating on the surface of the porcelain insulator, put it into an oven for heat treatment at 120 degrees Celsius after natural drying;

[0028] (5) Mix trimethylchlor...

Embodiment 3

[0031] (1) Using tetraethyl orthosilicate (TEOS) as the precursor and absolute ethanol as the flux, under the condition of alkaline catalysis, according to the quality of tetraethyl orthosilicate: absolute ethanol: ammonia water = 1:20:1 After mixing, stir at a temperature of 50°C to prepare a silica sol;

[0032] (2) Modifying the silica sol in step (1), adding 10 wt% of Coatosil 1770GE, stirring at room temperature, and then performing vacuum defoaming treatment;

[0033] (3) Clean the surface of the silicone rubber insulator, dip it in a methanol solution containing 3wt% N-β-aminoethyl-γ-aminopropylmethyldimethoxysilane for 8 minutes, take it out and dry it naturally;

[0034] (4) Carry out pull-coating coating on the silicon rubber insulator in the silica sol modified in step (2), form a coating on the surface of the porcelain insulator, put it into an oven for heat treatment at 110 degrees Celsius after natural drying;

[0035] (5) Mix trimethylchlorosilane (TMCS), hydro...

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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...

Claims

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Application Information

Patent Timeline
20 May 2009
Publication
CN101434709A
IPC
C08J7/06; C08L83/04
Inventors
金海云; 周蕊