对-氨基苯甲酸改性环氧树脂的性能表征及乳化性质

Characterization of p-Aminobenzoic-acid-modified Epoxy Resin and Its Emulsification Properties

以对氨基苯甲酸改性环氧树脂，使其成为具有亲水性的树脂．实验结果表明，改性后树脂在有机溶剂中的溶解性变差，在碱性溶剂中溶解性增强．对改性树脂进行了红外表征，并根据环氧基特征峰的吸收对环氧基转化率进行了定量分析．测定了改性产物的DSC曲线，发现随着反应物中对氨基苯甲酸比例的升高，改性产物的玻璃化转变温度升高．此外还研究了改性环氧树脂水基微乳液制备过程的电导率变化规律，并探讨了羧酸基中和程度及溶剂极性对乳液粒径以及粒子形态的影响．

Abstract The bisphenol type epoxy resin was modified by p-aminobenzoic acid to from amphophilic products. Although the modified resins had a poorer solubility in organic solvents, they tended to be dissolved more easily in basic solvents. The modified resins were characterized by using IR spectroscopy and DSC. The IR spectra of the modified resin indicate that the epoxy conversion increased with the increase of the content of p-aminobenzoic acid. The DSC curves demonstrated the same trend of the glass transition temperature of the modified resins. The conductivity variations during the emulsification process of different systems were investigated. The dissociation of carboxyl groups and aggregation of particles during emulsification were proposed for the conductivity variation. The influence of neutralization value and solvent polarity on the particle size and morphology of the modified resin emulsion were also studied.