Study on Composite Silicone Rubber Aging Based on TG-FTIR

doi:10.3969/j.issn.1008-0198.2024.01.003

Abstract

Abstract: Composite silicone rubber insulators have been widely used in overhead transmission lines, but their aging has always been an important problem. In order to investigate the aging process of the composite silicone rubber, the aging process of the composite silicone rubber samples is accelerated under the salt spraying environment. Scanning electron microscope is used to observe micro-morphology changes of the surfaces during the aging process of the samples.The thermos-gravimetric(TG) and Fourier transform infrared (FTIR) spectroscopies are used to analyze the changes of the component contents and functional groups during the aging process of the specimens.The TG-FTIR technology is used to analyze the pyrolysis products of the composite silicone rubber samples. The results show that after salt spray aging the pyrolysis products of the samples contain water vapor, CO₂ and a little organosilicon.These phenomena indicates that salt spray aging will hydrolyze the hydrophobic groups in the side chains of the samples, such as CH₃Si and (CH₃)₂Si, and produce hydroxylated groups, such as silicone hydroxyl (OHSi)and carbon hydroxyl (OHC), which will affect the hydrophobicity of the samples and reduce the pollution resistance.

Key words: composite insulator, silicone rubber, aging, TG-FTIR

CLC Number:

TM854

CHEN Tiantian, ZHA Fanglin, LIU Yiyi, WAN Tao, CHEN Bo. Study on Composite Silicone Rubber Aging Based on TG-FTIR[J]. Hunan Electric Power, 2024, 44(1): 18-23.

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