改性咪唑环氧树脂中温固化剂的制备与性能

Preparation and Properties of Multi-Acid Modified Imidazole Curing Agents for Epoxy Resin Under Middle Temperature

以不同多元羧酸(MA)、2-甲基咪唑(MI)及2-乙基己酸(EHA)进行酰胺化反应并成盐,得到咪唑酰胺化衍生物盐(MIADS),作为环氧树脂中温固化剂。用红外光谱(FT-IR)、动态热机械分析(DMA)、热重分析(TGA)和力学性能测试等方法对固化剂结构及环氧树脂固化物的性能进行了表征。结果表明,多元酸改性咪唑(MIADS)降低了咪唑的固化反应活性,提高了与环氧树脂的相容性,使环氧树脂固化物的力学性能和耐热性均得到明显提高。因此MIADS是一种综合性能优良的改性咪唑类环氧树脂中温固化剂。

A series of 2-methylimidazole amidate derivatives（MIAD） were synthesized by amidation reaction of multi-acid（MA） and 2-methylimidazole（MI）.And the 2-methylimidazole amidate derivative salts（MIADS） were prepared by salification of MIAD and 2-ethyl hexanoate（EHA）.The structures and properties of MIADS and thereof epoxy resin thermosets were characterized by Fourier transform infrared spectrum（FT-IR）,dynamic mechanical analysis（DMA）,thermogravimetric analysis（TGA） and mechanical properties testing.It is found that MIADS have lower curing activities and better latent properties than those of MI.And they also have better compatibility with epoxy resin than MI,which improving mechanical properties and heat resistances of epoxy resin thermosets obviously.It is proved that MIADS are a kind of imidazole curing agents for epoxy resin under middle temperature with excellent comprehensive performance.