摘要
以PMX-561(聚二甲基硅氧烷)为基体、JHN311(甲基三甲氧基硅烷)为处理氧化铝(Al)2O_3)、氧化锌(Zn O)粉体表面的硅烷偶联剂,制备了低黏度高导热绝缘硅脂。研究结果表明:当w(JHN311)=1.3%(相对于粉体质量而言)时,其对Al)2O_3的表面处理效果相对最优;当不同类型的Al)2O_3质量分数相同时,无规Al)2O_3填充硅脂的热导率和黏度相对更高,但无规(Al)2O_3难以达到高填充量的要求;对大粒径和小粒径Al)2O_3填充硅脂而言,前者的黏度小于后者,但前者的热导率大于后者;当w(粒径分布适宜的复配填料)=92%(相对于硅脂总质量而言)时,所得低黏度高导热的绝缘硅脂之热导率为3.98 W/(m·K)、黏度为20 000 m Pa·s和体积电阻率为9.13×10^(16)Ω·cm。
With PMX-561 （polydimethyl siloxane） as matrix, JHN311 （methyl trimethoxysilane） as silane coupler for treating surface of alumina （A1203） and zinc oxide （ZnO） powders, an insulation silicon grease with low viscosity and high thermal conductivity was prepared. The research results showed that the JHN311 had the relatively best effect in treating A1203 surface when mass fraction of JHN311 was 1.3% in powder. The amorphous Al2O3-filled silicon grease had the relatively higher thermal conductivity and viscosity when mass fractions of different types Al2O3 were same, but the amorphous Al2O3 reach difficultly the requirement of high fill. For large size and small size Al2O3-filled silicon greases, the viscosity of the former was smaller than that of the latter, but the thermal conductivity of the former was larger than that of the latter. The thermal conductivity, viscosity and volume resistance were 3.98 W/（m. K）, 20 000 mPa. s and 9.13× 10 ^16 Ω· cm respectively for the obtained insulation silicon grease with low viscosity and high thermal conductivity when mass fraction of hybrid filler with meet size distribution was 92% in total silicon grease.
出处
《中国胶粘剂》
CAS
北大核心
2016年第8期21-24,共4页
China Adhesives
关键词
硅脂
导热
绝缘
硅烷偶联剂
氧化铝
氧化锌
silicon grease
thermal conductivity
insulation
silane coupler
alumina （ Al2O3 ）
zinc oxide （ ZnO ）
