Process for the production of a coating-modified alumina insulator and insulator

By preparing a polyorganosilicon sol coating on the surface of alumina insulators using organosilicon reaction reagents, the problems of low withstand voltage increase and easy peeling of existing coatings are solved, achieving high withstand voltage and high temperature stability, and making it suitable for insulators of various shapes.

CN118969421BActive Publication Date: 2026-08-04NORTHWEST INST OF NUCLEAR TECH
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Patent Information

Application Number
CN202411043794.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-31
Publication Date
2026-08-04
Estimated Expiration
2044-07-31

AI Technical Summary

Technical Problem

Existing methods for preparing coatings on the surface of alumina insulators have limitations such as limited voltage withstand capability, easy coating peeling, and inability to meet the requirements for high-temperature baking and degassing sealing.

Method used

A coating was prepared on the surface of alumina insulators using organosilane reaction reagents. A polyorganosilicon sol coating was prepared by forming chemical bonds with the surface of alumina insulators through molecular groups with high voltage resistance, such as long-chain alkyl, fluorocarbon, or delocalized electron groups. The coating was then subjected to a dehydration condensation reaction to form a stable coating.

Benefits of technology

It significantly improves the surface withstand voltage level of the insulator, has strong adhesion between the coating and the insulator body, is suitable for high-temperature environments, is widely applicable to insulators of various shapes, and does not affect the mechanical strength of the insulator body.

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Abstract

The application provides a preparation method of a coating modified alumina insulator and the insulator, and can solve the problems of low pressure resistance improvement range, easy peeling of the coating, and the coating being mostly a polymer coating, which cannot meet the high-temperature baking and gas removal sealing requirements of the alumina insulator. The method comprises the following steps: respectively weighing tetraethyl orthosilicate, dimethyldiethoxysilane and X triethoxysilane, and mixing to obtain an organosilane reaction reagent; adding isopropyl alcohol into a reaction container, and then adding the organosilane reaction reagent and deionized water into the reaction container under stirring to obtain a reaction liquid; adjusting the pH of the reaction liquid, and reacting until the reaction liquid is in a clear and transparent state, and then cooling to room temperature to obtain a polyorganosilica sol; coating the polyorganosilica sol on the surface of a pre-prepared alumina insulator body, and then drying in air, and then undergoing a dehydration condensation reaction to obtain the coating modified alumina insulator.
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