中国胶粘剂

以三甲氧基封端聚硅氧烷(107胶)、Al2O3粉末为原料,在常温下直接掺混分散,加入除水剂、交联剂、催化剂及偶联剂,制备出脱醇型RTV-1有机硅导热粘接胶。考察了Al2O3粉末不同粒径质量搭配比、填充量、交联剂用量与偶联剂种类对产品性能的影响。研究结果表明:导热粘接胶制备工艺简单,产品综合性能好;当107胶100份、交联剂2份、三种Al2O3粉末总填充量500份且按照m(A)∶m(B)∶m(C)=2∶3∶5比例添加时,产品的表干时间为3 min,邵氏A硬度为80,拉伸强度为1.59 MPa,伸长率为29.53%,热导率为1.87 W/(m·K)。选择偶联剂双(3-三甲氧基硅基)丙胺与2-(3,4-环氧环己烷基)乙基三乙氧基硅烷搭配,产品对玻璃、铝、聚碳酸酯(PC)、聚对苯二甲酸丁二醇酯(PBT)、聚对苯二甲酸乙二醇酯(PET)、聚氯乙烯(PVC)和丙烯腈-丁二烯-苯乙烯共聚物(ABS)有良好的粘接性,可以适用工业用产品要求。

Using trimethoxy-terminated polysiloxane(107 adhesive)and Al2 O3 powder as raw materials,directly blending and dispersing them at room temperature,adding water removing agent,crosslinking agent,catalyst and coupling agent,dealcoholized RTV-1 silicone thermally conductive adhesive was then prepared. The effects of different particle size and mass ratio,filling amount of Al2 O3 powder,amount of crosslinking agent and type of coupling agent on product properties were investigated. The research results showed that the preparation process of thermally conductive adhesive was simple and the comprehensive performance of product was good.When 100 phr of 107 adhesive,2 phr of crosslinking agent,500 phr of three kinds of Al2 O3 powders in total according to the ratio of m(A)∶m(B)∶m(C)=2∶3∶5 were added,the tack-free time of product was 3 min,the Shore A hardness was 80,the tensile strength was 1.59 MPa,the elongation was 29.53%,and the thermal conductivity was1.87 W/（m·K）. The coupling agent bis(3-trimethoxysilyl)propylamine was selected to compound with 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane,the product had good adhesion to glass,aluminum,polycarbonate(PC),polybutylene terephthalate(PBT),polyethylene terephthalate(PET),polyvinyl chloride(PVC)and acrylonitrilebutadiene-styrene copolymer(ABS),which could meet the requirements of industrial products.