聚碳酸酯型水性聚氨酯分散体的合成与性能研究

采用聚碳酸酯二元醇Desmophen C与TDI合成了水性聚氨酯分散体。拉伸试验结果表明,乳胶膜具有优异的拉伸强度(高达60 MPa)和断裂伸长率(高达600%)。研究了软段分子量、软段用量对聚碳酸酯聚氨酯力学性能和微观相分离结构的影响。结果表明,随着软段用量的增加,乳胶膜的断裂强度迅速下降,断裂伸长也有所下降。不同分子量的聚碳酸酯也具有相同的规律。但相同软段用量,随着分子量的增加,断裂强度并没有下降,反而有所上升,且断裂伸长略有下降。同时聚碳酸酯型水性聚氨酯乳胶膜具有优异的水解稳定性。

Synthesis and performance study on water-borne polycarbonate-based PU dispersion

Water-borne PU dispersion is synthesized from polycarbonate diols Desmophen C and TDI. Tensile test results show that the latex lm is of excellent tensile strength (as high as 60MPa) and elongation at break (as high as 600%). The in uence of soft segment molecule weight, soft segment content on the mechanical performance and microscopic phase separation structure of polycarbonate-based PU, showing that with the increasing of soft segment usage, breaking strength of the latex lm quickly decreases and the elongation at break also decreases in some degree, and polycarbonate with di erent molecule weight following the same law; but at the same usage of soft segment, with the increasing of molecule weight, the breaking strength doesn’t decrease, and instead, increases in some degree, and the elongation at break decreases a little; in the some time, the water-borne polycarbonate-based PU is of excellent hydrolytic stability.