表层氟化环氧纳米复合材料表面的电荷动态特性  

Surface Charge Accumulation and Decay of Direct-fluorinated Epoxy TiO_2 Nanocomposites

作　　者：李昂[1] 杜伯学[1] 徐航[1] 李忠磊[1] 肖萌[1] 韩涛[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072

出　　处：《高电压技术》2015年第2期410-416,共7页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2014CB239506)~~

摘　　要：环氧树脂绝缘表面积聚的大量电荷是导致表面闪络的重要因素。在环氧树脂中掺杂TiO2无机纳米颗粒之后,可以增强其力学性能和抗电痕破坏性能,但对其表面电荷动态过程研究较少。同时,表层氟化可以保持原有有机聚合物的优良性能之外,还可使聚合物的本证缺陷得到改善。为此,制备了纯环氧试样以及含纳米TiO2质量分数分别为2%、4%、6%、8%的纳米复合试样,并对试样进行不同时间(0、30、60、90、120 min)的氟化处理,研究其在直流电场下纳米TiO2质量分数与氟化时间对表面电荷的积累与消散特性的综合影响。研究表明:纳米TiO2颗粒会减缓环氧树脂表面电荷消散的速度,6%纳米复合试样电荷消散最慢;表层氟化处理可以加速电荷消散速度,所以可以通过表层氟化处理来弥补纳米颗粒加入后对环氧树脂绝缘性能所带来的不利影响。The accumulation of surface charge may cause electric field distortion which would lead to surface flashover. Nano-scale TiO2 doped in the epoxy resin can enhance the mechanical properties and resistance to tracking failure. However the mechanism of surface charge is seldom discussed. Meanwhile, fluorination can keep the good performance of organic polymer and improve the defects of polymer. In this paper, nano particles were dispersed in samples with weight ratios of 2%, 4%, 6%, and 8%. The undoped samples were employed as a comparison. After different fluorination time of 0, 30, 60, 90, 120 min respectively, surface charge accumulation and decay behavior were measured by an electrostatic voltmeter. The results proved that the addition of nano particles slowed down decay process. The lowest decay rate appears at 6%. However, fluorination can accelerate decay process. Taking all these into consideration, insulation properties can be improved.

关 键 词：环氧树脂 纳米复合绝缘材料 TIO2 高压直流 表面氟化 表面电荷 电荷消散 

分 类 号：TM215.1[一般工业技术—材料科学与工程]