高性能环氧-双马胶粘剂的研制

Development of high performance epoxy-bismaleimide adhesive

采用不同环氧树脂、环氧扩链剂、双马来酰亚胺树脂,以及固化剂、引发剂等,制备了5种综合性能优良的高性能环氧-双马胶粘剂(K-1~K-5),并测试了其黏度、凝胶化时间及表观活化能、介电性能、变温拉伸剪切强度和吸水率等指标。研究结果表明:(1)配制的5种不同的环氧胶粘剂,在常温下黏度都很低,超过70℃后,其黏度都低于400 mPa·s,更容易与其他材料混合、涂敷和渗透。(2)5种环氧树脂胶粘剂的活化能在61.5~71.0 kJ/mol之间,表现出较高的反应活性。(3)5种配方胶粘剂的介电损耗均小于2.1%,材料的介电常数在3.9至4.5之间,表现出良好的介电性能。(4)在5种配方的环氧胶粘剂中,K-5在高低温下的剪切强度整体优于其余4种,在高低温下均具有12 MPa以上的剪切强度,具有优良的耐高低温稳定性,能满足基体树脂强度及耐高低温性能的基本要求,是一种性能较为优异的环氧胶粘剂。(5)5种配方的环氧胶粘剂吸水率在0.29%~0.57%之间,均在1.00%以下,具有较好的憎水性。其中K-5的吸水率为0.29%,在5种环氧胶粘剂中是最低的,能满足电学性能要求以及在潮湿等环境下的较多需求。

Five kinds of high performance epoxy-bismaleimide adhesives(K-1~K-5)with excellent comprehensive properties were prepared by using different epoxy resins,epoxy chain extenders,bismaleimide resins,curing agents,initiators,etc.The viscosity,gelation time,apparent activation energy,dielectric property,tensile shear strength at variable temperature,water absorption rate and other indicators were tested.The research results showed that,(1)The five different epoxy adhesives prepared had low viscosity at room temperature,and their viscosity was below 400 mPa·s after exceeding 70℃,which made them easier to mix,apply and penetrate with other materials.(2)The activation energy of five epoxy resin adhesives ranged from 61.5 to 71.0 kJ/mol,demonstrating a high level of reactivity(.3)The dielectric loss of five formulation adhesives was less than 2.1%,and the dielectric constant of the materials was between 3.9 and 4.5,demonstrating good dielectric properties.(4)Among five formulations of epoxy adhesives,K-5 had overall better shear strength at high and low temperatures than the other four,with a shear strength of over 12 MPa at both high and low temperatures.It had excellent high and low temperature stability and could meet the basic requirements of matrix resin strength and high and low temperature resistance and was a high performance epoxy adhesive.(5)The water absorption rate of five formulations of epoxy adhesives ranged from 0.29%to 0.57%,all below 1.00%,indicating good hydrophobicity.Among them,K-5 had a water absorption rate of 0.29%,which was the lowest among five epoxy adhesives,and could meet the electrical performance requirements as well as various demands in humid environments.