双重改性水性聚氨酯固化剂的合成

Synthesis of Doubly Modified Waterborne Polyurethane Curing Agent

以六亚甲基二异氰酸酯（HDI）和三羟甲基丙烷（TMP）为主要原料,聚乙二醇400（PEG400）为非离子亲水改性剂,羟乙基磺酸钠为离子亲水改性剂,合成了双重亲水改性聚氨酯固化剂.研究发现：反应温度、反应时间、n -NCO/n -OH ,PEG400用量、羟乙基磺酸钠用量及多元醇和固化剂的配比对固化剂及涂膜性能均有影响.当反应温度控制在80℃,反应时间控制在3 h,n -NCO/n -OH 比值为3.0,PEG400质量分数为15.8%,羟乙基磺酸钠质量分数为3.17%,多元醇与固化剂的配比 m-NCO/m-OH 在1.4~1.6时涂膜的硬度、耐水性、耐乙醇性最佳.研究中使用傅里叶变换红外光谱和高分辨扫描电镜等仪器对合成过程及涂膜性能进行了表征.

Doubly Modified Waterborne Polyurethane Curing Agent was successfully synthesized with Hexamethylene diisocyanate （HDI）and Trimethylolpropane （TMP）as the main materials,Polyethylene Glycol 400（PEG400）as the nonionic modifier and sodium hydroxyerthyl sulfonate as the ionic modifier. The properties of the curing agent and films such as gloss,hardness,solvent resistance,and water resist-ance were significantly affected by the amount of PEG400,sodium hydroxyerthyl sulfonate and the reaction temperature ,reaction time and the ratio of dispersion to curing agent.The optimum performance was ob-tained with the content of PEG400 and sodium hydroxyerthyl sulfonate reaching 15.8% and 3.17%,and the reaction temperature and time were kept at 80 ℃and 3h,and the ratio of curing agent to dispersion was 1.4~1.6.Furthermore,the synthetic process of the curing agent and film properties were characterized by FTIR and SEM,etc.