壳聚糖季铵盐/水性环氧树脂体系的制备及性能研究

Preparation and performance of chitosan quaternary ammonium salt/waterborne epoxy resin system

将壳聚糖季铵盐(QCS)水溶液与水性环氧树脂(WEP)共混,得到均一的QCS/水性环氧树脂体系。采用静置实验考察了QCS对水性环氧树脂体系稳定性的影响。以聚醚胺(PEA)固化WEP-QCS,通过示差扫描量热仪(DSC)分析了WEP-QCS-PEA体系的固化反应动力学,研究了QCS对水性环氧树脂固化反应的影响,确定了最优固化工艺为80℃/4 h+120℃/2 h。采用冲击实验分析了最优条件下固化样品的力学性能。结果表明,QCS/水性环氧树脂体系具有较好的稳定性,QCS的加入使体系反应活化能降低,当QCS质量分数为3%时,WEP-QCS-PEA体系的冲击强度为77.1 kJ/m^(2),较纯环氧树脂体系WEP-PEA固化物的冲击强度58.4 kJ/m^(2)提高了32%。

The chitosan quaternary ammonium salt(QCS)aqueous solution was mixed with waterborne epoxy resin(WEP)to obtain a homogeneous QCS/waterborne epoxy resin system.The effect of QCS on the stability of waterborne epoxy resin system was investigated by the static experiment.The polyether amine(PEA)was used as the curing agent for WEP-QCS and the curing reaction kinetics of the WEP-QCS-PEA system was analyzed by differential scanning calorimetry(DSC).The effect of QCS on the curing reaction of waterborne epoxy resin was studied,and the optimal curing process was determined to be 80℃/4 h+120℃/2 h.The mechanical properties of cured samples under optimal conditions were analyzed by impact tests.The results showed that the QCS/waterborne epoxy resin system had good stability,and the reaction activation energy of the system was reduced by the addition of QCS.When the QCS mass fraction was 3%,the impact strength of the WEP-QCS-PEA system was 77.1 kJ/m^(2),which was 32%higher than the impact strength of the pure epoxy resin system WEP-PEA cured product,which was 58.4kJ/m^(2).