C6F12O/N2混合气体与密封材料丁腈橡胶的相容性研究

doi:10.19595/j.cnki.1000-6753.tces.201730

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摘要 C₆F₁₂O具有优异的绝缘和环保性能,因此具有在中低压开关设备中作为绝缘介质应用的潜力。为了评估C₆F₁₂O/N₂混合气体在设备中长期安全稳定使用的可行性,需要研究其与设备内部中常用密封橡胶之间的相容性。该文通过搭建相容性试验平台,对C₆F₁₂O/N₂混合气体与丁腈橡胶进行热加速试验研究,分别采用傅里叶变换红外光谱仪和扫描电镜检测气体分解产物和丁腈橡胶表面形貌;同时基于密度泛函理论（DFT）对气体分解产物的生成路径进行模拟,并对丁腈橡胶分子与C₆F₁₂O分子之间的相互作用进行计算。试验结果表明在高温（90℃和110℃）试验后,丁腈橡胶与C₆F₁₂O/N₂混合气体不相容。丁腈橡胶表面析出大量的白色晶体颗粒,并且生成了C₃F₆、NF₃和CS₂气体副产物;理论计算也表明升高温度会促进丁腈橡胶分子发生分解,并且C₆F₁₂O与丁腈橡胶之间的气固反应具有形成新物质的趋势。该文的研究成果对C₆F₁₂O/N₂混合气体在工程上的应用具有重要的指导意义。

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关键词 ： C₆F₁₂O/N₂混合气体, 丁腈橡胶, 材料相容性, 密度泛函理论

Abstract：The new environment-friendly insulating medium C₆F₁₂O has good potential to apply in medium and low voltage equipment due to its excellent environmental properties and good insulation performance. In order to evaluate the reliability of long-term safe and stable of C₆F₁₂O/N₂ gas mixture in the equipment, it is necessary to study the compatibility between C₆F₁₂O/N₂ gas mixture and sealing rubber. In this paper, the compatibility of C₆F₁₂O/N₂ gas mixture with NBR is studied by using thermal acceleration method. The composition products of gas mixture and the morphology properties of nitrile Butadiene Rubber (NBR) are revealed based on fourier transform infrared spectrometer and scanning electron microscope respectively. Meanwhile, the formation path of gas decomposition products is simulated based on density functional theory, and the interaction process between NBR and C₆F₁₂O molecules is calculated. It is found that NBR rubber is incompatible with the C₆F₁₂O/N₂ gas mixture at temperatures higher than 90℃. There exists chemical reactions between NBR and C₆F₁₂O/N₂ gas mixture, resulting in the generation of gaseous byproducts including C₃F₆, NF₃ and CS₂ and the precipitation of while crystal particles on the surface of NBR. The theoretical calculation also shows that the increase of temperature can promote the decomposition of NBR molecules, and the gas-solid reaction between C₆F₁₂O and NBR tends to form new substances. The study results can provide important theoretical and technical guidance for engineering application of the C₆F₁₂O/N₂ gas mixture.

Key words： C₆F₁₂O/N₂ gas mixture nitrile butadiene rubber (NBR) material compatibility density function theory (DFT)

收稿日期: 2020-12-01

PACS:

TM213

基金资助:国家自然科学基金（51977159）和湖北省自然科学基金（2020CFB398）资助项目

通讯作者: 田双双女,1989年生,博士,讲师,研究方向为气体绝缘设备在线检测与故障诊断,SF₆替代气体。E-mail：tianshuang1002@163.com

作者简介: 兰佳琪女,1996年生,硕士研究生,研究方向为电气设备在线监测与故障诊断。E-mail：18186473625@163.com

引用本文:

兰佳琪, 田双双, 李晓涵, 饶夏锦, 张小龙. C₆F₁₂O/N₂混合气体与密封材料丁腈橡胶的相容性研究[J]. 电工技术学报, 2022, 37(5): 1285-1293. Lan Jiaqi, Tian Shuangshuang, Li Xiaohan, Rao Xiajin, Zhang Xiaolong. Compatibility between C₆F₁₂O-N₂ Gas Mixture and Sealing Material Nitrile Butadiene Rubber. Transactions of China Electrotechnical Society, 2022, 37(5): 1285-1293.

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