双组分缩合型有机硅电子灌封胶的制备及其导热阻燃性能研究  

Preparation and property of two-part condensation-type silicone encapsulant with thermal conductivity and flame retardance

作　　者：董晓娜[1] 谌开红[1] 陈衍华[1] 金贞玉 

机构地区：[1]江西省科学院应用化学研究所,南昌330096

出　　处：《化工新型材料》2015年第4期30-32,36,共4页New Chemical Materials

基　　金：2013年江西省科技厅科技支撑基金项目资助(20132BBE50013)

摘　　要：以低黏度的α,ω-二羟基聚二甲基硅氧烷为基胶,甲基三甲氧基硅烷、二甲基二乙氧基硅烷和KH-550为复合交联剂,二月桂酸二丁基锡为催化剂,α-氧化铝为导热填料、氢氧化镁为阻燃剂,制备了可室温固化的双组分缩合型有机硅导热阻燃灌封胶。研究了基胶的选择、交联剂的配比、导热填料α-氧化铝的用量和阻燃剂氢氧化镁的用量对有机硅电子灌封胶性能的影响。结果表明:有机硅电子灌封胶的拉伸强度和断裂伸长率随基胶黏度的增大而增大,邵氏硬度随基胶黏度的增大而降低。实验发现当选用黏度为4000MPa·s的α,ω-二羟基聚二甲基硅氧烷作为基胶、导热填料α-氧化铝含量为40份、阻燃剂氢氧化镁含量为30份时,灌封胶的导热率最大达到0.826 W/(m·k),垂直燃烧等级达到了FV-0级,具有良好的导热阻燃性能,且未固化前灌封胶的流动性和渗透性良好,因此作为电子灌封胶使用时,综合性能优良。Two-part condensation type room temperature vulcanizing silicone encapsulant with thermal conductivity and flame retardant was prepared with low viscosity α,ω-dihydroxy polydimethyl siloxane mixture as basic gum,methyl trimethoxy si- lane, two methyl two ethoxy silane, γ-aminopropyl triethoxysilane as compound crosslinking agent,tin dibutyl dilaurate as catalyst, α-Al2O3 as thermal conductive filler and Me（OH）3 as flame retardant filler. The influence of the viscosity of basic gum, the ratio of crosslinking agent, the content of α-Al2O3 and Me（OH）3 on the properties of encapsulant were investigated. The results showed that the tensile strength and elongation of encapsulant increased as the viscosity of α,ω-dihydroxy polydimethyl siloxane increased, on the contrary,the hardness decreased. When the viscosity of α,ω-dihydroxy polydlmethyl siloxane was 4000MPa· s,the thermal conductivity could reach 0. 826W/（m· K） ,vertical burning test ranking of FV-0 was obtained. The unvulcanized encapsulant had good flowability and permeability. It had excellent synthetic properties when used as electronic potting.

关 键 词：双组分缩合型 室温固化 有机硅灌封胶 导热 阻燃 

分 类 号：TQ433.438[化学工程]