摘要
在复合绝缘材料中引入高导热率无机填料,在增加绝缘材料导热率的同时,会对其绝缘性能及介电弛豫特性产生影响。文中针对碳纳米管与微米尺寸玻璃纤维复合填充的环氧树脂,在20～180℃以及0.01 Hz～1 MHz内,对其进行了交流击穿、介电弛豫、电导以及玻璃化转变等过程的实验研究。结果表明,在100～180℃高温中,经0.2 wt%碳纳米管以及40 wt%玻纤填充改性后的环氧树脂,其短时交流击穿场强提高了37.7%～49.2%,相对介电常数下降了2.2～3.4,介电损耗因数下降了27.4%～69.7%,复合材料的玻璃化转变温度也由109℃提升至141℃。研究认为,碳纳米管与微米尺寸玻纤的协同填充效应,有效抑制了高温下复合材料的电子崩发展、离子迁移以及结构蠕变,进而显著改善了复合材料的绝缘性能。
Besides of the ability of improving dielectric thermal conductivity,implantation of inorganic fillers with high thermal conductivity into composite dielectric material also brings some influences on polymer insulating behavior and dielectric relaxation.This study emphasizes the high-temperature dielectric properties of epoxy resin filled with carbon nanotubes and micron-sized glass fibres.Under 20 to 180℃and 0.01 Hz to 1 MHz,AC breakdown field,dielectric permittivity,conductivity and glass transition temperature of modified epoxy resin composite were measured.Experimental results show that,within 100 and 180℃,short-time AC breakdown field of epoxy resin can be improved by 37.7%to 49.2%.Moreover,relative permittivity and dielectric loss factor of composite also can be decreased by 2.2 to 3.4 and 27.4%to 69.7%,respectively.The glass transition temperature of epoxy resin can be increased from 109 to 141℃.It is considered that synergistic effect of carbon nanotubes and micron-sized glass fibres in polymer composite is responsible for the inhibition of electron avalanche development,ion migration and structural creep,which obviously improved the insulating behavior of polymer composite.
作者
杨建新
杨威
寇长珍
YANG Jianxin;YANG Wei;KOU Changzhen(Shaanxi Electric Power Company of State Grid Corporation,Xi'an 710048,China;Yangzhong Technology Supervision and Information Institute,Jiangsu Yangzhong 212200,China;Department of Electrical Engineering,Xi'an University of Technology,Xi'an 710048,China)
出处
《高压电器》
CAS
CSCD
北大核心
2018年第12期122-128,共7页
High Voltage Apparatus
关键词
环氧树脂
碳纳米管
玻璃纤维
介电特性
玻璃化转变温度
epoxy resin
nanosized carbon tube
glass fibre
dielectric properties
glass transition temperature
作者简介
杨建新(1961-),男,高级工程师,从事超高压电网安全技术及运维管理;杨威(1979一),男,工程师,主要从事高低压电器的标准化与质量监督;寇长珍(1992-),女,工程师,主要从事纳米绝缘材料的开发。
