Study on Acid Thermal Aging Characteristics of Composite Insulator Core Rod Material Based on TGA and SEM
摘要
In recent years, a novel “decay-like fracture” has emerged in China's transmission line composite insulators, posing risks to safe operation. These insulators encounter combined acid, heat, and water effects during use. Research mainly focuses on heat or acid, not reflecting actual external stresses on composite insulators. Hence, this study considers acid, heat, and water, conducting vacuum and acid thermal aging tests on bisphenol An epoxy resin. TGA and SEM analyze degraded samples. Findings show similar reaction mechanisms in intact epoxy resin at different heating rates. Changes minimally affect mass loss, keeping reaction mechanism stable. Acid thermal aging reduces activation energy, lowering the “threshold” for thermal stress erosion, degrading epoxy resin at lower temps. High-temp vacuum aging and low-temp acid aging form bubbles on epoxy resin, resembling decay. This explains minor temp rises yet severe epoxy resin degradation in decayed insulators.