107硅橡胶接枝甲基MQ硅树脂及其在硅脂中的应用

Dihydroxy Polydimethyl Siloxane Grafted Methyl MQ Silicone Resin and its Application in Silicone Grease

以甲基MQ硅树脂、甲基三丁酮肟基硅烷、二羟基聚二甲基硅氧烷等为原料,制得107硅橡胶接枝甲基MQ硅树脂的接枝组合物。再以此为基础聚合物,添加氧化铝、氧化锌、氮化硼等制得导热硅脂。107硅橡胶接枝甲基MQ硅树脂的较佳配方为:200份甲基MQ硅树脂、15份甲基三丁酮肟基硅烷、2 000份二羟基聚二甲基硅氧烷、18份超纯水,恒温反应15 h。采用500份该接枝组合物、2 000份氧化铝、1000份氧化锌、400份氮化硼、200份六甲基二硅氮烷制得导热硅脂,热导率3.1 W/(m·K)、体积电阻率3×10^(13)Ω·cm、针入度265(1/10 mm)、挥发分质量分数0.32%、油离度为0.02%。

The grafting composition was synthesis with methyl MQ silicone resin as the raw materials,methyltrissilane and dihydroxy polydimethyl siloxane.And then,the thermal grease was prepared with the grafting composition as the base polymer,aluminum oxide,zinc oxide and boron nitride as the filler.Results showed that better formulation of the grafting composition is methyl MQ silicone resin of 200 phr,methyltrissilane of 15 phr,dihydroxy polydimethylsiloxane of 2000 phr and ultrapure water of 18 phr,reaction for 15 hours in the constant temperature.The preparation of thermal grease was 500 phr of the grafted combination,2000 parts of aluminum oxide,1000 parts of zinc oxide,400 phr of boron nitride,and 200 phr of hexamethyldisilazane.The thermal grease had the thermal conductivity of 3.1W/(m·K),volume resistivity of3×10^(13)Ω·cm,penetration of 265~1/_(10)mm,volatile quality fraction of 0.32%,with low degree of the oil dispersion was 0.02%.