C_(6)F_(12)O混合气体与三元乙丙橡胶的相容性研究  

Study on the Compatibility of C_(6)F_(12)O Gas Mixture with EPDM

作　　者：田双双 刘本立 邓广宇 张晓星 李慧慧 刘伟豪 陈辉[1] TIAN Shuangshuang;LIU Benli;DENG Guangyu;ZHANG Xiaoxing;LI Huihui;LIU Weihao;CHEN Hui(Hubei Univ.of Technol.,Hubei Eng.Research Center for Safety Monitoring of New Energy and Power Grid Equipment,Wuhan 430068,China;Xiangyang Industrilal Inst.of Hubei Univ.of Technol.,Xiangyang 441000,China;Economic and Technical Research Inst.of State Grid Hubei Electric Power Co.,Ltd.,Wuhan 430000,China)

机构地区：[1]湖北工业大学新能源及电网装备安全监测湖北省工程研究中心,湖北武汉430068 [2]襄阳湖北工业大学产业研究院,湖北襄阳441000 [3]国网湖北省电力有限公司经济技术研究院,湖北武汉430000

出　　处：《工程科学与技术》2024年第5期106-116,共11页Advanced Engineering Sciences

基　　金：国家自然科学基金项目(52107145);湖北省自然科学基金项目(2021CFA025)。

摘　　要：C_(6)F_(12)O作为一种新型环保绝缘气体,与缓冲气体混合后具有作为绝缘介质运用于中低压电气设备的潜力。然而,环保气体绝缘设备内的密封材料是否与C_(6)F_(12)O长期兼容还有待深入研究。为此,本文研究了C_(6)F_(12)O/CO_(2)混合气体与气体绝缘设备中常用的三元乙丙橡胶(EPDM)的相容性和O_(2)对C_(6)F_(12)O/CO_(2)混合气体与EPDM相容性的影响。本文搭建了气固相容性实验平台,并结合实际运行温度进行不同温度下C_(6)F_(12)O混合气体与EPDM的相容性实验,测试了实验后EPDM的表面形貌、表面元素、力学性能和气体成分的变化,以确定C_(6)F_(12)O混合气体与EP-DM的长期相容性。同时,构建了C_(6)F_(12)O混合气体与EPDM分子链的仿真模型,基于分子动力学(MD)理论计算了C_(6)F_(12)O、CO_(2)与EPDM之间的扩散系数、相互作用参数和混合能。结果表明:在110℃热加速实验后EPDM表面产生鳞状结构,并在EPDM表面检测到C—F键、有机氟化物和金属氟化物,EPDM的力学性能降低,实验后主要气体产物为C_(3)F_(6)和C_(3)F_(7)H。加入O_(2)后,EPDM在90℃时表面出现凸起,并且有大量O、F元素积累在表面,EPDM力学性能下降,气体产物增多。理论计算也表明升高温度和加入O_(2)会加速C_(6)F_(12)O混合气体在EPDM中的扩散,导致气体分子与EPDM相容性变差。本文的研究成果将为C_(6)F_(12)O气体绝缘设备的设计和制造过程提供参考。Objective SF6 is widely used in electrically insulated equipment due to its excellent insulating properties.However,its global warming potential is 23500 times greater than that of CO_(2),with an atmospheric lifespan of up to 3200 years.As the severity of global warming intensifies,finding a new environmentally friendly insulating gas to reduce the using of SF6 has become a hot research topic in recent years.C_(6)F_(12)O has both environmental benign characteristics and insulating properties,which has attracted the attention of scholars.However,the liquefaction temperature of pure C_(6)F_(12)O gas is 49℃at atmospheric pressure,which is difficult to use as an insulating medium in practical engineering scenarios.It must be mixed with low-boiling point buffer gases,including CO_(2)and N2.It has been shown that a gas mixture comprising 4%C_(6)F_(12)O/CO_(2),when pressurized above 0.14 MPa,can be used as an insulating gas in 10 kV switchgear.For new eco-friendly insulation gas,its compatibility with the internal sealing materials of the equipment is also need to be considered.Method The experimental study on the compatibility between the C_(6)F_(12)O/CO_(2)gas mixture and the sealing rubber EPDM was carried out by building a thermally accelerated compatibility experimental platform in this paper.The effect of trace O_(2)on the compatibility of C_(6)F_(12)O gas mixture and EPDM was investigated by adding a small amount of O_(2)into the gas mixture.The changes in the surface morphology,the elements of rubber samples,the gas mixture components,and the mechanical properties were analyzed before and after the experiments.The interaction between C_(6)F_(12)O/CO_(2)/O_(2)gas mixture and rubber was also calculated based on the MD theory.Results and Discussions The results from scanning electron microscopy showed that the scaly structures appeared on the surface of EPDM when mixed with C_(6)F_(12)O/CO_(2)at 110℃.A flocculent structure appeared when EPDM was mixed with C_(6)F_(12)O/CO_(2)/O_(2)at only 90℃.This observation

关 键 词：C_(6)F_(12)O混合气体 三元乙丙橡胶 相容性 分子动力学模拟 

分 类 号：TM213[一般工业技术—材料科学与工程]