DMPA含量对不同软段结构水性聚氨酯性能的影响

Influences of DMPA contents on properties of waterborne polyurethane with differentsoft chain segment structures

以聚酯多元醇、异佛尔酮二异氰酸酯(IPDI)和二羟甲基丙酸(DMPA)为主要原料,采用预聚体分散法合成了一系列具有不同软段结构的水性聚氨酯(WPU)。研究结果表明:随着DMPA掺量的不断增加,WPU的稳定性提高、黏度增大、粒径减小且粒径分布变窄,WPU胶膜的拉伸强度在一定范围内增大、断裂伸长率降低、水接触角减小和耐水性下降,并且软段微区的结晶性能降低。

With polyester polyol, isophorone diisocyanate （IPDI） and dihydroxymethyl propionic acid （DMPA） as main raw materials, a series of waterborne polyurethane （WPU） with different soft chain segment structures were synthesized by prepolymer dispersion method. The research results showed that the WPU＇ s stability and viscosity were increased, particle size was decreased, and particle size distribution was narrowed with increasing DMPA contents. Meanwhile, the tensile strength of WPU film was increased in a certain range, but its elongation at break, water contact angle and water resistance were decreased, and the crystallization in soft chain segment mierophase was declined.