Comparative Study on Multi-Stress Aging Characteristics of Silicone Rubber Composite Insulators Based on FTIR

DOI: https://doi.org/10.62517/jes.202602228

Author(s)

Qi Liu*, Chuanqiang Che, Mingzuo Xie, Xuefang Liu, Huijie Jia

Affiliation(s)

Inner Mongolia Power (Group) Co., Ltd., Inner Mongolia Electric Power Research Institute, Hohhot, Inner Mongolia, China *Corresponding Author

Abstract

Composite insulators are faced with the dual test of ultraviolet radiation and high temperature environment in the long-term operation. The evolution of its micro-chemical structure directly determines the macroscopic properties and service life of the material. To elucidate the degradation mechanisms of silicone rubber in composite insulators under various environmental stressors, the microstructural changes of the specimens during ultraviolet and thermal aging were systematically characterized using Fourier transform infrared spectroscopy (FTIR). The findings indicate that the pristine samples display distinct absorption bands ascribed to the aluminum hydroxide (ATH) filler at 3619, 3525, 3438, and 3374 cm⁻¹. The UV aging leads to the complete disappearance of the filler peak in the 3400-3600 cm⁻¹ region, and a dense silicon inorganic layer is formed on the surface, and the infrared light cannot penetrate into the matrix. The new absorption peaks appeared at 1576, 1540, 1472 and 1412 cm⁻¹ in the thermal aging samples, which may be the carboxylate generated by the reaction of the carboxylic acid generated by thermal oxidation with the ATH filler.

Keywords

Composite Insulator; Silicone Rubber; Infrared Spectroscopy; Aging

References

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