通过以双酚A型环氧树脂(E-51)为树脂基体,双酚A型酚醛环氧树脂为改性剂,4,4-二氨基二苯砜(DDS)为固化剂,研制出了一种耐高温环氧胶粘剂。结果表明:酚醛环氧树脂的加入能够大幅度地提高环氧胶粘剂的耐温性能。动态热机械分析结果显示,酚醛环氧树脂的加入,使环氧树脂体系的玻璃化转变温度(Tg)从216.46℃提高到了234.03℃;在氮气氛围下,其失重5%的温度从387.03℃提高到了395.779℃;在空气氛围下,其失重5%的温度从373.95℃提高到了381.271℃。同时,酚醛环氧树脂改性环氧胶粘剂的150℃剪切强度比常规环氧树脂体系提高了35.9%,175℃剪切强度提高了10.06MPa。预期在民用航空等领域可得到广泛的应用。
A high temperature resistant epoxy adhesive was developed by using bisphenol A epoxy resin(E-51) as resin matrix,bisphenol A type phenolic epoxy resin as modifier and 4,4-diaminodiphenyl sulfone (DDS) as curing agent.The results showed that the addition of phenolic epoxy resin greatly improved the temperature resistance of epoxy adhesive.The results of dynamic thermomechanical analysis revealed that the addition of phenolic epoxy resin made the glass transition temperature (Tg) of the epoxy resin system change from 216.46℃ to 234.03℃;under nitrogen atmosphere,the temperature of 5% weight loss increased from 387.03℃ to 395.779℃;under air atmosphere,the temperature of 5% weight loss increased from 373.95℃ to 381.271℃.At the same time,the 150℃ shear strength of the modified epoxy adhesive increased by 35.9% compared with the conventional epoxy resin system,and the 175℃ shear strength increased by 10.06MPa.It is expected to be widely used in civil aviation and other fields.
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