Abstract: Two series of crosslinking polyurethaneurea (PUU) aqueous dispersions were prepared from polyether polyol，isophorone diisocyanate，dimethylolpropionic acid and ethylenediamine，in which castor oil and trimethylolpropane were used as internal crosslinking agents respectively. The properties of the cross-linked PUU aqueous dispersions and their films were investigated. The results showed that for these aqueous dispersions，the particle size increased as the crosslinking agent content increased，but the polydispersity index was very narrow (≤1.15). Compared with the linear PUU aqueous dispersion，the cross-linked PUU one exhibited larger particle size but the film prepared with the latter exhibited excellent waterproof performance and mechanical properties. The water absorption ratio of the cross-linked PUU films decreased from 52.4% to 12.0%.

摘要： 以二羟甲基丙酸（DMPA）、异佛尔酮二异氰酸酯（IPDI）、乙二胺作为硬段，聚醚多元醇（GE220）为软段，以蓖麻油（CA）和三羟甲基丙烷（TMP）多元醇为内交联剂，制备了两个系列的交联型水性聚氨酯脲（PUU）分散液，测定了PUU水分散液及其膜的物理性能和力学性能。结果表明，与未交联的PUU水分散液相比，交联型PUU表现出较好的疏水性能，吸水率从52.4%下降到12.0%，力学性能也有较大程度的提高。随交联剂用量的增加，尽管水分散液的粒径略有增加，但成膜后的耐水性增强，力学性能提高。