Silicone rubber for dry-type transformer and preparation method thereof, dry-type transformer

By using a combination of large- and small-particle-size magnesium oxide and aluminum hydroxide in silicone rubber for dry-type transformers, the problems of insufficient thermal conductivity and flame retardancy have been solved, improving the thermal conductivity, flame retardancy, and resistance to electrical corrosion of silicone rubber, and reducing equipment wear and modification costs.

CN122103902APending Publication Date: 2026-05-29JIANGSU SHENMA ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU SHENMA ELECTRIC CO LTD
Filing Date
2026-01-20
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing silicone rubber for dry-type transformers has defects such as low thermal conductivity, poor flame retardancy, weak resistance to tracking and electrical erosion, and traditional thermally conductive fillers such as alumina are expensive and have complex modification processes, leading to equipment wear and material performance degradation.

Method used

Magnesium oxide with large and small particle sizes is compounded with aluminum hydroxide as a thermally conductive and flame-retardant filler. Through segmented mixing and in-situ modification processes, the filler is uniformly dispersed in silicone rubber. The high thermal conductivity of magnesium oxide and the endothermic decomposition characteristics of aluminum hydroxide are utilized to improve the thermal conductivity and flame-retardant properties of the material.

Benefits of technology

It achieves high thermal conductivity, excellent flame retardancy, resistance to electrical erosion, and heat resistance of silicone rubber, meeting the requirements of dry-type transformers for high-performance external insulation, and reducing equipment wear risk and modification costs.

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Abstract

The application provides a kind of silicone rubber for dry-type transformer and its preparation method and dry-type transformer.The method comprises: first mixing of raw silicone rubber, sequentially adding fumed silica and first coupling agent, vacuumizing after continuing mixing into a mass to carry out first kneading, to obtain first product;adding flame-retardant filler to the first product, second mixing is carried out, to obtain second product;adding heat-conducting filler and second coupling agent to the second product in sequence, third mixing is carried out, to obtain mixing rubber;cooling the mixing rubber to room temperature, adding vulcanizing agent to the mixing rubber, second kneading is carried out, to obtain silicone rubber;the heat-conducting filler is magnesium oxide, and the flame-retardant filler is aluminum hydroxide;the particle size of magnesium oxide includes 1-2 μm and / or 5-10 μm, the particle size of aluminum hydroxide includes 1-2 μm and / or 5-10 μm, and the particle size of one of magnesium oxide and aluminum hydroxide at least includes 1-2 μm, and the particle size of the other at least includes 5-10 μm.The silicone rubber of the application has excellent heat resistance, heat conduction, flame retardancy, tracking resistance and electrical erosion resistance.
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