光固化导热硅橡胶复合材料的制备及其性能研究  

Preparation and Performance of UV-Curing Thermal Conductive Silicone Rubber Composites

作　　者：张梓华 戴文胜 向洪平 ZHANG Zihua;DAI Wensheng;XIANG Hongping(School of Materials and Energy,Guangdong University of Technology,Key Laboratory of Functional Soft Condensed Matter,Guangzhou 510006,China)

机构地区：[1]广东工业大学材料与能源学院,广东省功能软凝聚态物质重点实验室,广州510006

出　　处：《有机硅材料》2024年第4期1-5,25,共6页Silicone Material

基　　金：国家自然科学基金(52273104);广东省自然科学基金(c22140500000761)。

摘　　要：以乙烯基硅油和巯基硅油为基体,球形Al2O3作为导热填料,探究球形Al2O3粒径大小及其填充量对光固化导热硅橡胶导热性能、光固化动力学和机械性能的影响。光固化动力学研究结果表明,随着Al2O3的质量分数从100%增加到300%,导热硅橡胶的光固化凝胶时间从50 s延长到150 s;随着Al2O3填料填充量的增加,光固化硅橡胶体系中双键转化率不断下降,当Al2O3质量分数为400%时,经过70 s的固化,双键转化率低于15%,与其它Al2O3填充量下的硅橡胶相比,其固化速率差距明显。虽然导热硅橡胶的固化速率受Al2O3填料影响,但相较于橡胶的传统固化方式,仍旧具有快速固化的优点。通过测试填充Al2O3填料后硅橡胶的导热性能发现,不同粒径的Al2O3混合填料有助于提升硅橡胶的热导率;Al2O3填充量的增加也会提高硅橡胶的热导率,当Al2O3质量分数为400%时,光固化硅橡胶热导率可达1.022 W/(m·K)。Using vinyl-functionalized polysiloxane and thiol-functionalized polysiloxane as the substrate,spherical Al 2 O 3 as thermal conductive filler,the influences of spherical Al 2 O 3 filler characteristics(particle size and content)on the thermal conductivity,UV-curing kinetics and mechanical properties of thermal conductive silicone rubber composites were investigated.UV-curing kinetics result indicates that when Al 2 O 3 increases from 100wt%to 300wt%,the UV-curing time increases from 50 s to 150 s.As the double bonds conversion is also decreased with more Al 2 O 3 fillers,and it is lower than 15%after 70 s UV-curing in 400wt%of Al 2 O 3.Although the curing rate of silicone rubber is affected by Al 2 O 3 fillers,it outperforms the traditional curing silicone rubber.The results show that the thermal conductivity of silicone rubber is improved by mixture of Al 2 O 3 particles with different size.More Al 2 O 3 fillers will also enhance the thermal conductivity of silicone rubber,and the UV-cured silicone composite has thermal conductivity of 1.022 W/(m·K)with 400wt%Al 2 O 3 fillers.

关 键 词：光固化 硅橡胶 导热材料 巯基-烯反应 

分 类 号：TQ333.93[化学工程—橡胶工业]