阴离子型水性环氧树脂制备及其应用性能

Preparation and Application of Anionic Waterborne Epoxy Resin

通过己二酸与环氧树脂反应,并用KOH中和制备的阴离子型水性环氧树脂(AAEK)具有良好的亲水性,可作为碳纤维上浆剂对碳纤维表面进行修饰,将处理后的碳纤维与环氧树脂复合制备成碳纤维/环氧树脂复合材料。利用红外、扫描电镜、原子力显微镜、吸附实验、万能材料试验机对AAEK改性后的碳纤维和AAEK改性后的碳纤维/环氧树脂复合材料进行表征和测试。结果表明,AAEK的最佳上浆质量分数和吸附量为1.0%和3 mg/g;AAEK处理后的短丝碳纤维在环氧树脂中的分散性得到明显改善;AAEK在碳纤维表面的吸附是介于单分子层和多分子层之间的吸附过程,符合Freundlich吸附等温模型;AAEK处理后的碳纤维单丝断裂强度有少量增加;AAEK改性后的碳纤维/环氧树脂复合材料的弯曲强度和层间剪切强度(ILSS)相比于改性前分别提高了168%和139%。

Anionic waterborne epoxy resin（AAEK） was synthesized by using epoxy resin（EP） and adipic acid as reagents and KOH as neutralizing agent.The AAEK possesses hydrophilicity,which can be employed as sizing agent for carbon fiber（CF）,and then the CF/EP composites were obtained by mixing the treated CFs and EP.In addition,CF treated by AAEK（CF-AAEK） and CF-AAEK composite were investigated by infrared spectroscopy（IR）,scanning electron microscope（SEM）,atomic force microscopy（AFM）,adsorption testing and universal testing machine.The results indicate that the optimum concentration and adsorption amount are 1.0% and 3.0 mg/g respectively;the dispersion of short CFs in EP is dramatically improved after AAEK treatment;AAEK adsorption on the CF surface is an endothermic process between monolayer and multilayer,which consists with the adsorption model of Freundlich;the monofilament breaking strength of CF-AAEK increases slightly compared with the untreated CF.the flexural strength and interlaminar shear strength（ILSS） of CF-AAEK composite are proved to increase by 168% and 139% compared with untreated CF.