1-己基-3-甲基咪唑四氯化铁盐固化环氧树脂E-51的反应特性

Reaction Characteristics of Epoxy Resins E-51 Cured by 1-Hexyl-3-Methyl Imidazole Iron Tetrachloride Salt

采用差示扫描(DSC)量热分析法研究了1-己基-3-甲基咪唑四氯化铁离子液体([C6mim]Fe Cl4)与双酚A型环氧树脂E-51的固化反应。结果显示,由于[C6mim]Fe Cl4包含多级胺基结构,因此可以作为E-51的高温固化剂使用,其与E-51的反应包含两个阶段:第一个阶段的反应放热峰峰顶温度约在120℃,第二个阶段的反应放热峰峰顶温度会随着[C6mim]Fe Cl4用量的增加而发生变化。当[C6mim]Fe Cl4与混合胺复配成新型固化剂时,二者产生明显的协同效应。通过恒温DSC实验发现,复配体系与E-51的固化反应可以在室温下发生,表现为在30℃固化反应放热峰峰顶放热时间为5 min左右,且随着恒温固化反应温度的提高,峰顶放热峰时间会缩短。非等温动力学结果显示:复配体系与E-51的反应活化能为979 J/mol,仅是混合胺体系的17%左右。反应级数为0.5表明这一固化反应是无规反应。

Here we investigated the curing reaction between bisphenol epoxy resin E-51 and 1-hexyl-3-methylimidazole iron tetrachloride salt（[C6mim]Fe Cl4） by differential scanning calorimetry. It was confirmed that the multi-level amine structure makes [C6mim]Fe Cl4 possible to be used as high-temperature curing agent for E-51. The curing reaction can be divided into two stages：at the first stage,the exothermic peak is about120 ℃; at the second stage,the exothermic peak changes with the volume of [C6mim]Fe Cl4. When[C6mim]Fe Cl4 reacts with the mixed-amine to form a new curing agent,they exhibit apparent synergistic effect. The DSC results show that the new curing agent can react with E-51 under room temperature. The duration of exothermic peak is about 5 min at 30 ？,and moreover,the duration decreases with the increasing temperature. The activation energy of the reaction calculated by the method of non-isothermal kinetics is979 J/mol,which is only about 17% of the mixed-amine system. Finally,as the reaction order of the curing reaction is 0. 5,it is believed to be a kind of random reaction.