防污闪硬质涂层的研究  

Research on Anti-pollution Flashover Hard Coating

作　　者：贾志东[1] 何晓伟[1] 王威[1] 关志成[1] 

机构地区：[1]清华大学深圳研究生院,深圳518055

出　　处：《高电压技术》2012年第10期2514-2521,共8页High Voltage Engineering

基　　金：国家自然科学基金(51077081)~~

摘　　要：室温硫化硅橡胶涂层在运行过程中常出现严重积污,削弱了其原有的绝缘性能,在一些地区并未推广,因此研究具有高自洁性的防污闪硬质涂层具有重要实际应用价值。以有机硅树脂为基体,利用化学嵌段,引入具有一定分子量的线型聚硅氧烷,研制出防污闪硬质涂层。通过基于倾斜表面小玻璃球滚落特性的自洁性测试、多次涂污后的憎水迁移性测试、以涂层为试品进行的斜面法试验和闪络试验表明,防污闪硬质涂层硬度为邵氏D30,比室温硫化硅橡胶涂层更有利于微小颗粒物的滚落,憎水迁移性能稳定,耐漏电起痕性能可以通过TMA2.5级并高于室温硫化硅橡胶涂层,污闪电压值与室温硫化硅橡胶涂层相当。因此,防污闪硬质涂层比室温硫化硅橡胶涂层能够显著减少绝缘子表面污秽的积累,耐电弧烧蚀,有效防止污闪的发生。The insulation performance of room temperature vulcanized（RTV） silicone rubber coating will be impaired due to the heavy pollutions during its operation,thus the RTV coating is not widely used in some areas yet.Consequently,it is necessary to prepare anti-pollution-flashover hard coating with good self-cleaning ability.The hard coating was prepared using silicone resin which was added by a certain weight of molecular polydimethylsiloxane（PDMS） by chemical blocking.Self-cleaning was tested by small glass ball sliding down from inclined surface,multiple hydrophobicity transfer tests,inclined-planed tracking tests using coating specimens,and flashover experiments.The experimental results show that the hard coating has a hardness of Shore D30 and is more favorable for small solid particles sliding down from its surface than RTV coating;the hard coating has steady hydrophobicity transfer property,and its resistance to tracking and erosion achieves TMA2.5 rating,which is better than RTV coating;the pollution flashover voltage of the hard coating is no less than that of the RTV coating.Therefore,compared with the RTV coating,the hard coating can significantly reduce the accumulation of pollution on insulator surfaces,resisting tracking and erosion,and effectively preventing the pollution flashover.

关 键 词：硬质涂层 防污闪 自洁性 有机硅树脂 嵌段共聚物 憎水迁移性 耐漏电起痕 

分 类 号：TM85[电气工程—高电压与绝缘技术]