【摘要】 以聚四氢呋喃醚、异佛尔酮二异氰酸酯、2-乙基咪唑为原料,合成了以2-乙基咪唑封端的聚氨酯,并用于改性环氧树脂E-44。利用傅立叶红外分析仪、示差扫描量热仪、拉伸试验机等手段对其与环氧树脂混合物的凝胶时间、固化温度、解封情况、拉伸剪切强度等性能进行了研究。结果表明,咪唑封端的聚氨酯可以在130℃下较好地解封,每10份E-44添加1.0份聚氨酯固化剂,可使E-44环氧树脂在160℃下150 s内凝胶,130℃下10 min内固化,拉伸剪切强度达到15.2 MPa,是一种良好的中温快速固化环氧粘合剂。更多还原

【Abstract】 2-ethylimidazole terminated polyurethane was synthesized from polytetrahydrofuran glycol(PTHF),isophorone diisocyanate(IPDI) and 2-ethylimidazole as raw materials.The terminated polyurethane used to modify epoxy resin E-44.The gelation time,curing temperature,the release temperature and tensile shear strength of the curing system were investigated by infrared spectrum,DSC and cupping machine.The results showed that the 2-ethylimidazole terminated polyurethane could be deblocked at 130 ℃ and participated in cure reaction.The epoxy resin system could gelatin in 150 seconds at 160 ℃,cured in 10 minutes at 130 ℃ with adding 1.0 portion polyurethane curing agent per 10 portion E-44.The tensile shear strength reached 15 MPa.It was a kind of good performance mesotherm rapid solidification epoxy adhesive.更多还原