硝酸对硅橡胶的老化作用机理研究

doi:10.19595/j.cnki.1000-6753.tces.200809

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Abstract During the running of a silicone rubber composite insulator, the formation and permeation of nitric acid will reduce the properties of silicone rubber, which threatens the safety of the insulation device in power grid. In this paper, the aging mechanism of nitric acid on silicone rubber was systematically studied by several material characterization techniques. The results of GC-MS show that the polydimethylsiloxane (PDMS) in silicone rubber breaks into low molecular weighted siloxanes (LMW), resulting in the increase of the D₄~D₇. Moreover, the concentration of D₄ in the 600h nitric acid aged sample is 30 times that of the virgin one, and the left relative content of PDMS decreases by 9.16%. The results of FTIR and XPS show that the Si-C bond is broken and oxidized after aging with nitric acid, leading to the increase of Si-O₃ and Si-O₄, while the content of carbon element is reduced. At the same time, the C-H bond breaks and polar hydroxyl groups are introduced into methyl group. It can be seen that nitric acid mainly causes the aging of silicone rubber from two aspects: one is that the H⁺ acts on the Si-O bond in PDMS, which depolymerizes the PDMS network structure in silicone rubber; the other is that the highly oxidized NO₃^- acts on the groups in PDMS, which causes the surface of silicone rubber to change from non-polarity to polarity. These are the main reasons for the decrease in barrier and hydrophobicity of silicone rubber.

Key words： Silicone rubber nitric acid low-molecular-weight siloxane chemical structur

Received: 06 July 2020

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TM85

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	Articles by authors
	Zhang Ni
	Wang Zheng
	Yang Yue
	Peng Xiangyang
	Fang Pengfei

Cite this article:

Zhang Ni,Wang Zheng,Yang Yue等. Study on the Nitric Acid Induced Aging Mechanism in Silicone Rubber[J]. Transactions of China Electrotechnical Society, 2021, 36(22): 4820-4828.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.200809 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I22/4820

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