Heat-conducting voltage-resistant electric insulating material with high breakdown and preparation method thereof

Abstract

The invention discloses a heat-conducting voltage-resistant electric insulating material with high breakdown and a preparation method thereof. The heat-conducting voltage-resistant electric insulatingmaterial is prepared from the following raw materials in parts by weight: 70-90 parts of epoxy resin, 10-20 parts of polycarbonate, 2-4 parts of graphene, 6-8 parts of polybutylene succinate, 9-13 parts of butyl polymethacrylate, 10-12 parts of white carbon black, 6-8 parts of KH550 silane coupling agent, 10-14 parts of enhanced additive, 25-35 parts of compound rubber, 2-3 parts of vulcanizing agent, 8-10 parts of insulated heat-conducting additive, 2-4 parts of silicon dioxide, 9-11 parts of flame-retardant additive, 7-9 parts of processing aid and 4-8 parts of synergistic aid. The heat-conducting voltage-resistant electric insulating material has the advantages of high heat-conducting coefficient, better mechanical property and compression strength and tensile strength, higher breakdown voltage and excellent insulating property, simultaneously also has certain flame-retardant and antistatic properties; in addition, the preparation method disclosed by the invention has the advantages of lower cost, concise process, easy operation and industrial-production implementation, higher practical value and good application prospect.

Description

technical field [0001] The invention relates to the technical field of electric power materials, in particular to a thermally conductive and withstand voltage high breakdown electric insulating material and a preparation method thereof. Background technique [0002] At present, dry-type transformers, dry-type currents, and voltage transformers used in high-voltage transmission lines and substations all use epoxy resin as the outer covering material, which generally has disadvantages such as poor waterproofness and easy cracking at low temperatures. Secondary heating is required for deep vulcanization, which consumes a lot of energy. Silicone rubber is widely used in electrical and electronic industries due to its excellent heat resistance, cold resistance and electrical insulation. However, it is precisely because of this outstanding electrical insulation performance that the surface of silicone rubber-based insulating materials tends to accumulate charges during use, resul...

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Problems solved by technology

Due to the composition containing 90% inorganic fibers, inorganic ceramic fiber paper has outstanding heat resistance, the heat resistance temperature is as high as 250 ℃, the insulation life is long, and it is superior to polyaramid paper in terms of thermal conductivity and paint absorption ability; but inorganic The tensile strength and elongation of ceramic fiber paper are lower than that of polyaramid paper, and the paper is relatively soft, which greatly affects its wide use