摘要
用纳米SiO2、环氧树脂、酸酐、乙二醇等在80℃下制备了耐高温、耐高湿电阻用底漆,并对底漆的电性能、结构、热稳定性、机械强度、耐湿性能及电阻耐湿失效进行了分析研究.IR分析表明,纳米SiO2的加入改变了环氧树脂固化聚合物的结构,使其交联网状结构更为致密和稳定,且聚合物分子极性变小,从而对水具有较弱的亲和力,使得这种体系的底漆具有较好的耐高温高湿性能.冲击实验SEM照片显示加纳米SiO2的固化物呈韧性断裂,这表明纳米SiO2对环氧树脂具有增韧作用.当纳米SiO2质量分数为2.79×10-2时,底漆耐高温、耐高湿性能最好,且电阻变化率均小于1‰.
A kind of varnish, with high temperature and humidity resistance, for resistor was obtained by condensation of epoxy resin, acid anhydride and glycol with proper nano SiO2 added at 80℃. The investigation was conducted in the electrical performance, structure, thermal stability, mechanical robustness, humidity resistance for varnish and failure analysis of resistor resisting humidity. Infrared spectra （IR） analysis shows more compact and steady inter crosslinked network structure is formed in the modified undercoat polymer with nano-SiO2 added, and molecule polarity of the polymer becomes smaller, which makes the appetencies between the polymer and water molecules weaker. Hence, such undercoat is of excellent performance desired. The SEM picture of impact tests reveals solidifying polymer with nano-SiO2 presents itself gliding fracture, which concludes nano-SiO2 can improve the toughness of epoxy resin. When the mass fraction of nano-SiO2 is about 2.79×10^-2, the property of high temperature and humidity resistance for varnish is best, with varying ratio of resistance with such undercoat painted is less than one in a thousand.
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2006年第1期49-54,共6页
Journal of Wuhan University:Natural Science Edition
基金
国防科工委军工基金资助项目(编号略)
关键词
环氧树脂
纳米SIO2
底漆
耐高温高湿
电解氧化腐蚀
epoxy resin
nanar-SiO2
varnish
high temperature and humidity resistance
electrolytic oxidation corrosion
