CAJ | 학술논문

用双辊混炼机将导热填料分散到聚甲基乙烯基硅氧烷中,再配以增强剂、硫化剂等,经模压硫化制得导热硅橡胶.研究了导热填料种类、石墨的表面改性和用量以及石墨与炭黑的复配对硅橡胶导热性和力学性能的影响.结果表明,在用量相同的情况下,导热填料的导热系数越高,其填充硅橡胶的导热性越好,且硅橡胶的导热系数随导热填料用量的增加而增大.石墨的表面改性改善了石墨与硅橡胶的界面相容性,使硅橡胶的力学性能和导热性都得到提高.不同粒径及颗粒形态的炭黑与石墨复合可改善硅橡胶的导热性和力学性能,导热硅橡胶的拉伸强度和扯断伸长率随复合填料中炭黑用量的增加而提高,当石墨与炭黑质量比为25/5时,硅橡胶的导热系数最高,综合性能较好.
용쌍곤혼련궤장도열전료분산도취갑기을희기규양완중,재배이증강제、류화제등,경모압류화제득도열규상효.연구료도열전료충류、석묵적표면개성화용량이급석묵여탄흑적복배대규상효도열성화역학성능적영향.결과표명,재용량상동적정황하,도열전료적도열계수월고,기전충규상효적도열성월호,차규상효적도열계수수도열전료용량적증가이증대.석묵적표면개성개선료석묵여규상효적계면상용성,사규상효적역학성능화도열성도득도제고.불동립경급과립형태적탄흑여석묵복합가개선규상효적도열성화역학성능,도열규상효적랍신강도화차단신장솔수복합전료중탄흑용량적증가이제고,당석묵여탄흑질량비위25/5시,규상효적도열계수최고,종합성능교호.
Thermal conductive filler with reinforcing agent and crosslinking agent was dispersed in poly(methylvinyl siloxane) using a two-roll mill and the thermal conductive silicone rubber was obtained after curing in a mould. Effects of filler species, content and surface modificaton of graphite and its combination with carbon black on the properties of silicone rubber were systematically investigated. The results showed that at the same filler content the higher the coefficient of themal conductivity of filler was, the better the thermal conductivity of silicone rubber was. The coefficient of thermal conductivity of silicone rubber increased with the increase of the filler content. The surface modification of graphite improved the interfacial compatibility between graphite and silicone rubber, therefore the thermal conductivity and mechanical properties of silicone rubber increased. The silicone rubber with the complexed filler of graphite and carbon black having different sizes and morphology exhibited better thermal conductivity and mechanical properties. When the mass ratio of graphite to carbon black was 25/5, silicone rubber had the highest coefficient of thermal conductivity, and the tensile strength and elongation at break increased with increasing the content of carbon black in the complexed filler.