塑料科技2026，Vol.54Issue(5)：123-127,5.DOI:10.15925/j.cnki.issn1005-3360.2026.05.022
高压电缆附件用硅橡胶材料电气特性研究
Study on Electrical Properties of Silicone Rubber Materials for High Voltage Cable Accessories
摘要
Abstract
To investigate the variation in electrical properties of silicone rubber insulating materials coated with silicone grease at different thermal aging stages,silicone rubber samples coated with different types of silicone grease were subjected to thermal aging treatments at various temperatures and for different durations.The temperature-dependent conductivity,relative permittivity,dielectric loss tangent,and breakdown field strength of each sample under different aging conditions were measured.The results indicate that thermal aging causes degradation reactions such as chain scission and oxidation in the silicone rubber molecular chains,destroying the original cross-linked network structure and affecting the electrical properties of the silicone rubber insulation.This leads to an increase in conductivity,a rise in relative permittivity and dielectric loss tangent,and a reduction in insulation breakdown strength.During thermal aging,silicone rubber samples coated with silicone grease exhibit a swelling effect,which introduces a large number of short molecular chains similar to the main chain structure into the silicone rubber.These short chains undergo chemical reactions with the main molecular chains of the silicone rubber,leading to main chain scission,an increase in free volume and free electron concentration,and accelerated degradation of the silicone rubber insulation.The type of silicone grease used has a varying impact on the electrical properties of the silicone rubber samples.Among them,methylphenyl silicone grease is less prone to swelling with the silicone rubber molecules,so the electrical properties of silicone rubber samples coated with methylphenyl silicone grease are superior to those of samples coated with dimethyl silicone grease.关键词
硅橡胶/绝缘/热老化/硅脂/电气性能Key words
Silicone rubber/insulation/Thermal aging/Silicone grease/Electrical properties分类
化学化工引用本文复制引用
马涛,王一夔,孔雪城,宫毓斌,赵仁勇,张晓,王靖然..高压电缆附件用硅橡胶材料电气特性研究[J].塑料科技,2026,54(5):123-127,5.基金项目
国网山东省电力公司科技项目(520603230008) （520603230008）
