Aliphatic polyurathane emulsion was propared by the method of expanding chain after emulsing and influence of NCO%,COO% on the properties of polyurathane emulsion and film was discussed.

• 采用先乳化后扩链工艺合成脂肪族聚氨酯乳液 ,并讨论 NCO%25 ,COO- %25对乳液及膜性能的影响 ,结果表明 NCO%25越大 ,聚氨酯乳液膜的硬度越大 ,玻璃化转变温度越高 ;