湿污环境下绝缘子LSR和RTV涂层的性能对比  

Comparition on the Characteristics of Insulator LSR and RTV Coating in Polluted and Wet Environment

作　　者：贾志东[1] 叶蔚安 陈灿[1] 李智[1] 叶宁 JIA Zhidong;YE Wei＇an;CHEN Can;LI Zhi;YE Ning(Graduate School of Shenzhen,Tsinghua University,Shenzhen 518055,China;Shenzhen Square Silicone Materials Co.,Ltd.,Shenzhen 518112,China)

机构地区：[1]清华大学深圳研究生院,深圳518055 [2]深圳市森日有机硅材料科技有限公司,深圳518112

出　　处：《高电压技术》2018年第9期2769-2776,共8页High Voltage Engineering

基　　金：国家自然科学基金(51477806)~~

摘　　要：满足DL/T 627—2012标准的室温硫化硅橡胶（room temperature vulcanized,RTV）防污闪涂料在以广东为代表的高湿、多雨环境使用后出现了起皮和脱落的问题,为了提高绝缘子在湿污环境中的耐污性能,需要采用机械性能更优异的涂层。本文提出使用液体硅橡胶（liquid silicone rubber,LSR）涂层作为悬式绝缘子的防污闪涂层,通过憎水性迁移试验、污耐受试验、吸水吸湿试验、透水试验和压汞法,分别对比了LSR和RTV涂层在憎水迁移性、耐污性能、吸水吸湿特性、透水特性,孔隙率和孔径分布等方面的差异,并采用水煮试验加划圈法的方法研究了湿污环境中涂层的长效附着力。研究结果表明：LSR涂层的憎水迁移性弱于RTV涂层,但仍然可以大幅降低泄漏电流幅值,提高绝缘子的耐污性能;LSR涂层的吸水率和吸湿率均低于RTV涂层,透水速率略高于RTV涂层,而这种差异是由涂层孔隙特征和成分差异所导致的;LSR涂层在水煮试验中能够保持更长时间的附着效果,长效附着力更好。因此,在湿污环境中可以尝试使用具有更好适用性的LSR涂层作为RTV涂层的替代选择。RTV coating which has met the requirements of DL/T 627—2012 usually suffers from color peeling and shedding when it is operated in humid and rainy environment like Guangdong province. In order to improve the anti-pollution property of insulator in polluted and wet environment, a coating with better mechanical properties need to be adopted. Therefore, we adopted a LSR coating as an anti-pollution flashover coating of insulator. We compared the differences of the hydrophobicity transfer property, pollution withstanding property, water and moisture absorption property, water permeation property, porosity, and pore size distribution between LSR and RTV coatings by hydrophobicity transfer tests, pollution withstanding tests, water and moisture absorption tests, water permeation tests and the mercury intrusion method. Moreover, a water boiling method and circle method were combined to compare their long-term adhesive forces. Through the tests above, the following conclusions can be drawn. The LSR coating is found to have weaker hydrophobicity transfer property than the RTV coating, but it also can significantly decrease the leakage current of insulator and then improve its contamination withstanding property. The LSR coating has much lower water absorptivity and moisture absorptivity than the RTV coating, while its water permeation rate is slightly faster than the RTV coating, which is caused by the differences of pore characteristics and composition of coating. The LSR coating can keep longer adhesion in water boiling test, proving it has better long-term adhesive force than the RTV coating. Therefore, the LSR coating which has better adaptation to polluted and wet environments can be used as an alternative to the RTV coating in such environments.

关 键 词：湿污环境 LSR涂层 憎水迁移性 吸水吸湿 附着力 

分 类 号：TM216[一般工业技术—材料科学与工程]