可逆感温变色复合绝缘材料紫外老化特性的研究  

Study on Ultraviolet Ageing Characteristics of Reversible Thermochromic Insulating Composite

作　　者：陈田 高建[2] 杨凯[2] 李佩萱 尹桂来 晏年平 张宇 CHEN Tian;GAO Jian;YANG Kai;LI Peixuan;YIN Guilai;YAN Nianping;ZHANG Yu(Electric Power Research Institute of State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330000,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国网江西省电力有限公司电力科学研究院,江西南昌330000 [2]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049

出　　处：《绝缘材料》2020年第10期25-31,共7页Insulating Materials

基　　金：国家电网有限公司科技项目(智能感温变色复合绝缘材料研制及应用)。

摘　　要：制备了一种感温变色硅橡胶复合绝缘材料,并对其进行紫外老化,以可逆热变色特性、静态接触角和交流击穿场强为性能指标,研究感温变色硅橡胶复合绝缘材料的紫外老化特性。结果表明:感温变色硅橡胶复合绝缘材料的静态接触角在紫外老化前期变化不大,后期逐渐减小;交流击穿场强随着紫外老化的进行先升高后降低;可逆热致变色特性紫外老化条件下变化不大。进一步分析表明,紫外辐照会导致材料表面甲基数量下降,对强极性硅氧键的屏蔽作用减弱,造成静态接触角减小;交联密度的变化会对硅橡胶的陷阱能级和自由体积产生影响,从而改变交流击穿场强。A thermochromic silicone rubber insulating composite was prepared and then conducted ultraviolet(UV)ageing.The UV ageing characteristics of the composite were studied using the reversible thermochromic properties,static contact angle,and AC breakdown strength as performance indexes.The results show that the static contact angle of the thermochromic silicone rubber insulating composite changes little in the early stage of UV ageing and gradually decreases in the later stage;the AC breakdown strength increases at first and then decreases with the increase of ultraviolet ageing time;the reversible thermochromic performance changes little under UV ageing conditions.Further analysis shows that UV irradiation would reduce the number of methyl groups on the surface of material,which would weaken the shielding effect on the strong polar silicon-oxygen bonds,resulting in the decrease of static contact angle.The variation of crosslinking density has impact on the trap energy level and free volume of the silicone rubber,thereby the AC breakdown field strength changes.

关 键 词：感温变色 紫外老化 憎水性 交流击穿 交联密度 

分 类 号：TM215[一般工业技术—材料科学与工程]