双增韧剂改性环氧树脂

采用双增韧剂(端羧基液体丁腈橡胶(CTBN)与纳米SiO2(n-SiO2))对环氧树脂(ER)增韧,并用正交试验方法对其增韧条件进行了优化。通过对固化产物力学性能、热稳定性及微观形态的测定及表征,结果表明:优化的胶黏剂制备条件是双增韧剂(CTBN+n-SiO2)占ER的1/8、CTBN与n-SiO2的比例为2∶1、反应温度为180℃、反应时间为2.5 h,胶黏剂冲击强度达到18.24 kJ/m2;红外表明(FTIR)双增韧剂均与ER发生作用,热重分析(TG)结果显示固化产物热稳定性良好,扫描电镜(SEM)对固化产物微观形态的观察结果显示双增韧剂对ER增韧作用明显。

Epoxy Resin Toughed by Dual Toughening Agents

The epoxy resin adhesives were prepared by orthogonal experimentation method,which toughed by the dual toughening agents of the liquid end carboxyl group nitrile rubber(CTBN) and nanometer silicon dioxide(n-SiO2).The mechanical strength,thermal stability,micrograph of the adhesives were tested and studied.The results showed that when the ratio of ER and(CTBN/n-SiO2) was 8∶1,the ratio of CTBN and SiO2 was 2∶1,and the first ingredient reacted at 180 ℃ for 2.5 h,the shearing strength,the peeling strength of the cured adhesives reached the maximum.FTIR indicated that CTBN and n-SiO2 reacted with ER.SEM and TG results indicated that the toughing of the dual toughening agents to ER was obvious and the thermal stability was excellent.