双组分室温固化导热凝胶制备及性能研究

Preparation and Properties of Two-Component Room Temperature Curable Thermal Gel

摘要: 以端乙烯基聚二甲基硅氧烷为基胶，含氢硅油为交联剂，铂金络合物为催化剂，乙炔基环己醇为抑制剂，以陶瓷粉体为导热填料，制备了双组分室温固化导热凝胶，通过调控抑制剂的含量，研究了不同含量抑制剂对导热凝胶在室温下反应情况的影响，讨论了不同含量导热填料对导热凝胶各项性能的影响。结果表明，通过控制抑制剂含量，可有效调控导热凝胶的室温反应活性，制备出双组分室温固化导热凝胶。当导热填料添加份数为1300份时，制备的导热凝胶经过室温24小时固化后，导热系数为3.5 W/m∙K、10%压缩率下压缩应力为27 kPa、硬度为50、体积电阻率为10¹² Ω∙cm，具备良好的综合性能。

Abstract: A two-component room temperature curing thermal conductive gel was prepared with vinyl terminated polydimethylsiloxane as the base gum, hydrogen containing silicone oil as the crosslinking agent, platinum complex as the catalyst, ethynyl cyclohexanol as the inhibitor, and ceramic powder as the thermal conductive filler. By adjusting the content of the inhibitor, the effect of different contents of inhibitor on the reaction of the thermal gel at room temperature was studied, and the effect of different contents of thermal conductive filler on the performance of the thermal gel was discussed. The results showed that the room temperature reactivity of the thermal gel could be effectively controlled by controlling the inhibitor content, and the two-component room temperature curable thermal gel was prepared. When 1300 parts of thermal conductive filler were added, the thermal gel had good comprehensive performance after being cured at room temperature for 24 hours. The thermal conductivity was 3.5 W/m∙K, the compressive stress at a 10% compression rate was 27 kPa, the hardness was 50, and the volume resistivity was 10¹² Ω∙cm.