新型阳离子水性聚氨酯的合成与表征

摘要

以聚氧化丙烯二元醇(PE220)和异佛尔酮二异氰酸酯(IPDI)为原料,以自制的阳离子亲水单体Y-E51作为扩链剂,制备了阳离子型水性聚氨酯乳液(WPU),讨论了Y -ES1的摩尔分数对WPU乳液粒径分布及胶膜力学性能的影响,并通过红外光谱对产物的结构进行表征.结果表明:随着Y -E51摩尔分数的增加,乳液粒径分布变窄,胶膜的吸收率、甲苯溶胀率变大,拉伸强度增大,断裂伸长率下降；当Y -E51的摩尔分数为18％,胶膜的力学性能最佳.%A cationic waterborne polyurethane emulsion ( WPU) was synthesiszed by using IPDI and polyether glycol( PE220 ) as raw material,and Y - E51as cationic hydrophilic chain-extending agents. The chemical structure of the product was characterized by FT - IR. The influence of mole fraction of Y - E51 on the particle size distributions waterborne polyurethane emulsion and mechanical properties of film were studied. The experiment results showed that particle size distributions of waterborne polyurethane emulsion decreased ,tensile strength of film increased and elongation at break became weak with increasing of mole frac-toon of Y - E51. And when Y -E51 was 18% ,the film showed the best mechanical properties.