【摘要】 通过测定凝胶时间,利用红外光谱仪、差示扫描量热仪等对水性环氧树脂的固化反应进行了研究,并根据K issinger和Ozawa方法分别求得水性环氧树脂体系固化反应的表观活化能。结果表明,凝胶时间随着环氧与胺氢物质的量比的增大而增加,且环氧与胺氢物质的量比为1∶1时较好。环氧基特征吸收峰的强度随着固化反应时间的延长明显变弱,且固化4 h后,环氧的特征峰几乎全部消失。水性环氧体系固化的初始温度、峰值温度和终止温度随着升温速率的增加,均向高温方向移动,用Kissinger和Ozawa法求得水性环氧树脂固化的表观活化能分别为27.35 kJ/mol、32.77 kJ/mol,表明体系的表观活化能很低,固化反应很容易进行。更多还原

【Abstract】 The curing reaction of water borne epoxy system was studied by means of measuring the time of gel formation,infrared spectra and differential scanning calorimetry.The apparent activation energies were obtained by Kissinger and Ozawa equations.The results showed that the time of gel formation was increased with the increasing of equivalent proportion of epoxy-amine.As far as application is concerned,the epoxy-amine equivalent proportion of 1∶1 is better,and its curing time is about four hours.The infrared spectra indcated that the absorption peak of epoxy group was at 916 cm-1,and it became weak during the curing reaction process.After four hours’ curing,the curing reaction trends to complete.From the differential scanning calormetry we found that,the curing onset temperature,peak temperature and offset temperature were all increased with increasing the speed of scanning.The apparent activation energy obtained by Kissinger and Ozawa equations was 27.35 kJ/mol and 32.77 kJ/mol,respectively.The apparent activation energy of curing reaction for water borne epoxy resin system is very low,so the curing reaction is easy to happen.更多还原