Influence of Fluorination Treatment on Surface Performance of Liquid Silicone Rubber

doi:10.3969/j.issn.1008-0198.2025.04.004

Abstract

Abstract: In order to improve the surface characteristics of high-voltage composite bushings, two commercial liquid silicone rubbers are fluorinated using F₂/N₂ mixed gas. The electrical properties, physical and chemical properties, and hydrophobicity of the two liquid silicone rubber samples before and after fluorination are tested. The results shows that the DC flashover voltages of the two silicone rubber samples after fluorination have increased by more than 50% and 30% respectively. The two silicone rubber samples present different surface potential decay characteristics after fluorination. The surface conductivity of both is increased by 1~2 orders of magnitude, and the bulk conductivity does not change significantly. The increase in surface conduction caused by fluorination can accelerate the surface potential decay. Through ATR-IR analysis and SEM observation, C—F bonds are formed in the surface layer of the fluorinated samples, and micro-nano structuring appears on the surface of the fluorinated layer. The hydrophobicity test indicats that fluorination significantly has improved the hydrophobicity of the two liquid silicone rubber samples. Therefore, fluorination treatment is an effective means to enhance the surface performance of liquid silicone rubber used in high-voltage composite bushings.

Key words: liquid silicone rubber （LSR）, fluorination treatment, surface performance, hydrophobicity

CLC Number:

TM854

LI Dong, ZHU Zhien, GAO Kai, ZENG Hao, CHEN Longxiao. Influence of Fluorination Treatment on Surface Performance of Liquid Silicone Rubber[J]. Hunan Electric Power, 2025, 45(4): 21-26.

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