亲水扩链剂和中和剂对环氧聚氨酯乳液性能的影响

以二羟甲基丙酸(DMPA)作为亲水扩链剂,三乙胺(TEA)为中和剂,环氧树脂为大分子扩链剂,合成了环氧聚氨酯复合乳液(PUE)。讨论了DMPA和TEA的加入方式、DMPA的含量及中和度对PUE乳液及涂膜性能的影响。结果表明:随着DMPA用量和中和度的增加,PUE乳液的外观、稳定性变好,粘度增大,粒径减小,涂膜的硬度和拉伸强度提高;吸水率随着DMPA用量的增加先减小后增大,随中和度的提高而增大。把质量分数为6%的DMPA溶于NMP,在反应后期加入到体系中,当中和度为90%～100%,采取后中和的工艺时,可得到综合性能较好的PUE乳液。

Influence of Hydrophilic Chain-extender and Neutralizer on Performance of Epoxy Polyurethane Emulsion

Epoxy polyurethane hybrid emulsion was prepared by using dimethylolpropionic acid(DMPA) as a hydrophilic chain-extender,triethylamine(TEA) as a neutralizer,and epoxy resin as a macromolecular chain-extender.The effect of DMPA and TEA adding method,DMPA content,and neutralization degree on the properties of the epoxy polyurethane emulsion and its film were studied.The results showed that the appearance and stability of the PUE emulsion is improved,the viscosity of PUE emulsion and the hardness and mechanical property of PUE film increases with the increasing of DMPA dosage and neutralization degree;while the particle size of PUE emulsion decreases with the increasing of DMPA dosage and neutralization degree;the water absorption of the PUE film increases with the increasing of neutralization degree and decreases at first then increases with the increasing of DMPA dosage;when the ratio of DMPA to NMP is 6.0%,DMPA adds late in the reaction,and the neutralization degree is 90%~100%,and using the technology of late phase neutralization,the PUE emulsion product has better comprehensive performance.