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以双组分环氧树脂(EP)为基体树脂、4,4′-二氨基二苯砜(DDS)改性双马来酰亚胺(BMI)为固化剂,采用共混法制备出一种汽车同步器用耐高温结构胶。采用差示扫描量热(DSC)法、热重分析(TGA)法和动态力学分析(DMA)法考察了不同固化工艺和不同配方对结构胶的粘接性能、耐热性能及耐冻融循环性能等影响。结果表明:当m(双组分EP)∶m(预聚体或固化剂)=1.0∶1.0以及采用阶梯升温固化工艺“150℃/1 h→180℃/2 h→200℃/1 h”时,该结构胶具有良好的粘接性能(用于碳纤维与金属间粘接时)和工艺性能,其室温剪切强度为33.9 MPa、180℃剪切强度为23.7 MPa;该结构胶可在低于180℃环境中长期使用,并完全满足汽车同步器的使用要求。
A two-component epoxy resin (EP) as the matrix resin and 4,4’-diaminodiphenyl sulfone (DDS) modified bismaleimide (BMI) as the curing agent were prepared by blending method Automotive synchronizer with high temperature structural adhesive. The adhesive properties, heat resistance and freeze-thaw resistance of different structural adhesives with different curing processes and different formulations were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA) Performance and other effects. The results show that when m (bicomponent EP): m (prepolymer or curing agent) = 1.0:1.0 and the step-and-step curing process “150 ℃ / 1 h → 180 ℃ / 2 h → 200 ℃ / 1 h ”, The structural adhesive has good adhesive properties (for carbon fiber and metal bonding) and process performance, the room temperature shear strength of 33.9 MPa, 180 ℃ shear strength of 23.7 MPa; the structural adhesive In less than 180 ℃ environment long-term use, and fully meet the requirements of the use of automotive synchronizers.