摘要
C6F12O混合气体具有良好的绝缘性能,被认为具有较大潜力在中低压电气开关设备中作为绝缘介质使用。C_(6)F_(12)O与设备气室密封材料之间良好的相容性是保障设备长期安全稳定运行的关键之一。为此通过实验研究不同温度下,C_(6)F_(12)O/N_(2)混合气体与常用密封橡胶(三元乙丙橡胶(ethylene propylene diene monomer,EPDM)、丁腈橡胶(nitrile butadiene rubber,NBR)和氟橡胶(fluororubber,FKM))之间相容性,并通过气相色谱质谱仪分析混合气体的组分,扫描电镜、X射线光电子能谱和拉伸应力机检测橡胶材料的性质变化。同时搭建C_(6)F_(12)O与橡胶分子链的仿真模型,从分子层面计算分析C_(6)F_(12)O在橡胶材料中的扩散和吸附作用。实验结果发现随着实验温度升高,C_(6)F_(12)O/N_(2)混合气体与3种橡胶材料反应均生成了C_(3)F_(6)、C_(3)F_(7)H,并且还与FKM生成了CS_(2)气体副产物。同时EPDM表面出现了密集的褶皱,而NBR表面则析出了大量晶体颗粒,大量F元素积累在橡胶表面上,并且实验后EPDM和NBR的力学性能都大幅度下降。FKM表面结构和力学性能受C_(6)F_(12)O/N_(2)混合气体影响较小。理论计算发现升高温度能够促进C6F12O与橡胶中的扩散和吸附,并且在90℃下,C_(6)F_(12)O在EPDM中的扩散系数(8.912×10^(-11)m/s^(2))和吸附能最高(317.436kJ/mol),与FKM的吸附能最低。因此,综合分析实验和理论计算结果,C_(6)F_(12)O/N_(2)与FKM之间的相容性更好。该研究成果可为C_(6)F_(12)O/N_(2)混合气体相关设备材料选择提供重要的指导意义。
C_(6)F_(12)O gas mixture has excellent insulation properties, thus it is expected to be used as an insulating medium in medium and low-voltage electrical switchgear. In order to ensure the long-term safe and stable operation of equipment,the compatibility between C6F12O and sealing rubber materials is one of the important factors that cannot be ignored. In this paper, the compatibility between C_(6)F_(12)O/N_(2)gas mixture and common sealing rubbers(EPDM, NBR and FKM) at different temperatures is studied. The composition of the mixed gas is analyzed by gas chromatography mass spectrometry,and the properties of the rubber materials are detected by scanning electron microscope, X-ray photoelectron spectroscopy,and tensile stress machine. At the same time, a simulation model of C_(6)F_(12)O and rubber molecular chain is built, and the diffusion and adsorption of C6F12O in rubber materials are calculated and analyzed from the molecular level. The experimental results show that, with the increase of experimental temperature, C_(6)F_(12)O/N_(2)gas mixture reacts with three rubber materials to produce C3F6, C3F7H, and CS2gas by-products with FKM. At the same time, dense folds may appear on the surface of EPDM, while a large number of crystal particles are precipitated on the surface of NBR, and a large amount of F element is accumulated on the rubber surface. After the experiment, the mechanical properties of EPDM and NBR are significantly reduced. The surface structure and mechanical properties of FKM are negligibly affected by the C_(6)F_(12)O/N_(2)gas mixture. The calculated results are also in agreement with the experimental results. Increasing the temperature can facilitate the adsorption between C6F12O and rubber. At 90 ℃, the diffusion and adsorption energy between C_(6)F_(12)O and EPDM are the highest(8.912×10^(-11)m/s~2 and 317.436 k J/mol), respectively, and the adsorption energy between C_(6)F_(12)O and FKM is the lowest. Therefore, the comprehensive analysis of the experimental and theoretical calculation results shows that the compatibility between C_(6)F_(12)O/N_(2)and FKM is better. The research results of this paper can provide important guidance for the application of C_(6)F_(12)O/N_(2)gas mixture in engineering.
作者
田双双
兰佳琪
饶夏锦
李晓涵
邓广宇
邹怡
TIAN shuangshuang;LAN Jiaqi;RAO Xiajin;LI Xiaohan;DENG Guangyu;ZHOU Yi(Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment,Hubei University of Technology,Wuhan 430068,China;Electric Power Research Institute of Guangxi Power Grid Co.,Ltd.,Nanning 530000,China;Jingzhou Power Supply Company,State Grid Hubei Electric Power Company,Jingzhou 434000,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第11期4275-4286,共12页
High Voltage Engineering
基金
国家自然科学基金(51977159)
湖北省自然科学基金(2020CFB398)。
