【作者】 张博；

【导师】 张诚；

【作者基本信息】 浙江工业大学 ， 化学工程（专业学位）， 2017， 硕士

【摘要】 硅橡胶是有机硅材料的重要产品之一,由于其自身的导热性较差以及较差的压缩永久形变率,通过选择合适原料以及优化导热填料的填充方式,可以制备出兼具高导热性和低压缩永久形变率的硅橡胶复合材料。具有特定的双重优势的硅橡胶复合材料既具有研究价值又具有应用价值。本文中,选用具有合适的乙烯基含量的乙烯基硅油作为基础聚合物,含氢硅油为反应的交联剂,合适的无机物作为导热填料,通过催化加成反应,制备出高导热低压缩永久形变率的硅橡胶复合材料。本文主要作了以下的研究:首先是不同的A值(含氢硅油摩尔数与乙烯基硅油中乙烯基摩尔数之比,下同)以及导热填料的填充对硅橡胶复合材料的压缩永久形变率的影响。其次是利用DRP-II型导热仪测试了导热填料单组分的填充量和粒径对硅橡胶的导热率。然后研究分析了在单组分填料基础上双组份填料复配对硅橡胶的导热性能的影响。之后更进一步研究了三组分填料复配对硅橡胶复合材料的以导热性为首的物理性能的影响,并利用导热模型进行了相应的模拟分析以及SEM直观表征了硅橡胶表面的微观形貌;最后对比实验结果选出综合性能最平衡的硅橡胶导热复合材料。由一些列实验结果得到:本文中A=1.3时的硅橡胶具有最低的压缩永久形变率(15%),单组分导热填料粒径越大,填充量越大,压缩永久形变率就越高,不利于硅橡胶复合材料的综合表现。单组分填料中,氮化铝对导热性提升最大。高填充量比低填充量更有利于多组分复配填料的堆积,更有利于导热通路的形成;多组分填料复配能进一步提升硅橡胶导热系数,三组分复配比双组份复配更有效,硅橡胶复合材料能达到的最大导热系数是硅橡胶自身导热系数的5倍多。氮化铝以10μm/5μm/1μm的形式,3:2:1的比例最终制备了导热系数为0.934W/(m·k),压缩永久性变率为22%的硅橡胶复合材料。更多还原

【Abstract】 Silicone rubber is one of the important silicone material products,but its poor thermal conductivity,the compression set is relatively low.By selecting appropriate raw materials and optimization of thermal conductive filler filling method,it can produces a with high thermal conductivity and low compression.Silicone rubber composite materials with the dual specific advantages has research value and application value.In this study,using vinyl silicone oil with suitable vinyl content as base polymer,cross-linking agent containing silicone oil reaction,suitable inorganic compounds as thermal conductive filler,addition reaction with platinum catalyst under high temperature,a silicone rubber composite with high thermal conductivity and low compression set.In this study,the following researches has been mainly made :firstly,the effects from the different A values(the mole number ratio of vinyl invinyl silicon oil and hydrogen in silicone oil containing hydrogen,the same below)and thermal conductive fillers for the compression set of the silicone rubber;secondly,the effects of conductive filler of one-component filler’s content and particle size on the thermal conductivity of silicone rubber and other properties with the help of DRP-II thermal conductivity device;thirdly two-component mixed fillers based on the truth that one-component packing affects the thermal conductivity of silicone rubber;after that,the three-component with the thermal conductivity by physical properties of mixed fillers on silicone rubber composite materials,and the corresponding analysis model using quasi thermal conductivity model;finally select the silicone rubber conductive composite materials with the most balanced performance from the experimental results.A series of the experimental results indicates:the silicone rubber with A=1.3 has the compression set in this paper(15%),to one-component thermal conductive filler,the bigger particle size,and the greater the filling amount,the higher compression set,the higher the disadvantageous to the comprehensive performance of silicone rubber composites;In one-component filler filling,the maximum thermal conductivity comes from aluminum nitride;high filling quantity benefits more than low filling quantity the fillers packaging,making more conduction paths to the multi-component filler packing;multi-component mixed fillers can further enhance thermal conductivity of silicon rubber,multi-component is more effective than a two-component filling,the maximum thermal conductivity of silicon rubber composite is 5 times more than that of silicone rubber silicone itself by the addition of aluminum nitride;by the pattern form of 10μm/5μm/1μm,and the proportion of 3:2:1,finally a silicon rubber composite material was successfully produced with a comprehensive properties including 0.934w/(m·k)thermal conductivity coefficient and 22% compression set.更多还原