冷热冲击下纳米粒子改性硅橡胶/环氧树脂绝缘修复涂料耐电特性  

Electrical Resistance Characteristics of Nanoparticle-modified Silicone Rubber/Epoxy Resin Insulation Repair Coatings Under Cold Thermal Shock

作　　者：杨国清[1] 蒋超璐 张中杨 王德意[1] YANG Guoqing;JIANG Chaolu;ZHANG Zhongyang;WANG Deyi(School of Electricity,Xi’an University of Technology,Xi’an 710054,China)

机构地区：[1]西安理工大学电气工程学院,西安710054

出　　处：《高电压技术》2024年第5期2207-2216,共10页High Voltage Engineering

基　　金：陕西省教育厅重点科学研究计划项目(20JS101)。

摘　　要：为解决现有绝缘修复材料在大范围温度波动时出现绝缘件剥落、二次开裂、电气失效等问题,研制了多种纳米粒子填充的硅橡胶/环氧树脂复合修复涂料,对比分析了冷热冲击循环前后修复涂料的粘合强度、电气性能和微观结构。结果表明:冷热冲击会造成修复涂料分子主链断裂,产生低分子产物和氧化游离基团,导致涂料相对介电常数和介质损耗增大,击穿场强减小;而功能纳米母粒可提高界面结合能,阻碍聚合物分子的拉伸和扭转,使涂料具有相对稳定的化学结构,可防止冷热冲击下基体内局部劣化通道的延伸,从而有效抑制修复涂料耐电性能的下降;当玻璃纤维、纳米ZnO、SiO_(2)共混,填充量(质量分数)为16%时,涂料电气性能良好,且硅橡胶/环氧树脂复合修复涂料固化时间短,无溶胀现象发生,附着力良好,为设备绝缘快速修复提供可能。In order to solve the problems of spalling,secondary cracking and electrical failure of insulation parts when existing insulation repair materials fluctuate in a wide range of temperatures,a variety of nanoparticle-filled silicone rubber/epoxy resin composite repair coatings were developed in this paper,and the adhesive strength,electrical properties and microstructure of the repair coatings were compared and analyzed before and after cold and hot shock cycles.The results show that the thermal shock can cause the main chain break of repair coatings,produce low molecular products and oxidation free groups,increase the relative dielectric constant and dielectric loss of the coatings,and decrease the breakdown field strength.The functional nano-masterbatch can improve the interfacial bonding energy and hinder the polymer molecules of the tension and torsion,so that the paint has a relatively stable chemical structure.Therefore,the extension of the local deterioration channel in the matrix can be prevented under the cold and heat shock,effectively restraining the deterioration of the electrical resistance of the repair coatings.When the content of glass fiber,nano-ZnO and nano-SiO_(2) is 16%,the electrical properties of the coating is good.The silicone rubber epoxy composite repair coating has the advantages of short curing time,no swelling and good adhesion,which makes it possible to quickly repair the insulation of equipment.

关 键 词：冷热冲击 绝缘修复 纳米复合材料 介电性能 击穿特性 

分 类 号：TM215[一般工业技术—材料科学与工程]