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以BMI(双马来酰亚胺)作为改性剂、DDM(4,4’-二氨基二苯甲烷)作为固化剂,制备耐高温EP(环氧树脂)胶粘剂。研究结果表明:采用正交试验法优选出制备BMI/EP/DDM胶粘剂的最优方案为m(EP)∶m(DDM)=1∶1.00、m(BMI)∶m(EP)=0.4∶1、混合搅拌时间为30 min和搅拌转速为300 r/min;采用非等温DSC(差示扫描量热)法和T-β(温度-升温速率)外推法,确定了该胶粘剂的固化工艺条件为“60℃处理3 h→88℃处理2 h→112℃处理2 h→121℃处理2 h”;经BMI改性后,耐高温EP胶粘剂的耐热性和力学性能均有所提升。
A high temperature resistant EP (epoxy) adhesive was prepared using BMI (bismaleimide) as a modifier and DDM (4,4’-diaminodiphenylmethane) as a curing agent. The results show that the best scheme of preparing BMI / EP / DDM adhesive by orthogonal test is m (EP): m (DDM) = 1: 1.00, m , The mixing time was 30 min and the stirring speed was 300 r / min. The curing process conditions of the adhesive were determined by non-isothermal DSC (differential scanning calorimetry) and T-β (temperature-heating rate) For “3 h at 60 ℃ → 2 h at 88 ℃ → 2 h at 112 ℃ → 2 h at 121 ℃”, the heat resistance and mechanical properties of high temperature resistant EP adhesives are improved after BMI modification .