摘要
以α,ω-二羟基聚二甲基硅氧烷为基胶,Si3N4、Al N、Al2O3为导热填料,制备了填充型双组分室温硫化(RTV-2)导热硅橡胶。研究了填料Si3N4/Al2O3或Al N/Al2O3并用对RTV-2硅橡胶导热性能、工艺性能及力学性能的影响。结果表明,当填料的总体积分数为0.45时,对于Si3N4/Al2O3填充体系,随着体系中Al2O3体积分数的增加,RTV-2导热硅橡胶的热导率先升后降、拉伸强度先增后减,而扯断伸长率则呈逐渐升高的趋势,基料的粘度先减后增;当Al2O3的体积分数为0.14时,RTV-2导热硅橡胶的热导率最高、拉伸强度最大,基料的粘度最小,综合性能最佳。对于Al N/Al2O3填充体系,随着体系中Al2O3的体积分数的增加,RTV-2导热硅橡胶的热导率先升后降、拉伸强度及扯断伸长率先减后增,基料的粘度呈上升趋势;当Al2O3的体积分数为0.07时,RTV-2导热硅橡胶具有较好的导热性能和工艺性能,但力学性能偏低。
The heat conductive RTV-2 silicone rubber was prepared with α,ω-dihydroxyl polydimethyl siloxane as basic gum and Si_3N_4/Al_2O_3, AlN, Al_2O_3 as heat conductive filler. It was studied that the influences of the blends of Si_3N_4/Al_2O_3 or AlN/Al_2O_3 on the conductive, technology and mechanics properties of RTV-2 silicone rubber. The results showed that when the filler's total volume fraction was 0.45, with the increasing volume fraction of Al_2O_3, the thermal conductivity of RTV-2 silicone rubber increased firstly, and then decreased afterwards. And its tensile strength increased firstly, and then decreased later; while its tensile elongation went higher, and its viscosity decreased firstly, and then increased subsequently. When the volume fraction of Al_2O_3 was 0.14, the heat conductive RTV-2 silicone rubber had the highest thermal conductivity, the maximum tensile elongation, the lowest viscosity and the best comprehensive properties. As to AlN/Al_2O_3 filling system, when the volume fraction of Al_2O_3 increased, the thermal conductivity of RTV-2 silicone rubber increased firstly, and then decreased later; its tensile strength and tensile elongation decreased firstly, and then increased subsequently; and its viscosity went higher. When the volume fraction of Al_2O_3 was 0.07, the RTV-2 silicone rubber had good thermal conductivity and processing property, but with low mechanical properties.
出处
《有机硅材料》
CAS
2005年第5期15-17,共3页
Silicone Material
