提高水性聚氨酯/聚酰胺超纤革的染透性

Improving the dyeing penetrability of waterborne polyurethane/polyamide microfiber leather

为解决阴离子型水性聚氨酯/聚酰胺超细纤维(WPU/PA)合成革染透性差的问题,探究了酸性蓝260在WPU与PA两组分之间的分配关系。选用咪唑类和吡咯烷酮类透染剂对水性聚氨酯超纤革进行处理,测定染料上染率、K/S值,观察染色革截面的透染情况,并分析了透染剂的作用机理。结果表明:染料在WPU与PA纤维中的分配比为1∶9;水性聚氨酯超纤革预浸轧咪唑类和吡咯烷酮类透染剂(体积比1∶1)的水溶液,可以抑制WPU的凝胶化倾向,有效解决染色白芯问题,上染率也有所提高。在染色后期添加硫酸铵可以提高水性聚氨酯超纤革的上染率及K/S值。

In order to solve the problem of poor dyeing permeability of anionic waterborne polyurethane/polyam⁃ide ultrafine fiber(WPU/PA)synthetic leather,the distribution of Acid Blue 260 between WPU and PA fiber is in⁃vestigated.Imidazole and pyrrolidone dye penetrants are selected to treat waterborne polyurethane microfiber leather.The dye uptake,K/S value and cross-sectional penetration effect of the dyed leather are measured,and the mechanism of the dye penetrants is analyzed.The results show that the distribution ratio of dyes in WPU and PA fibers is 1∶9.Pre-padding of waterborne polyurethane microfiber leather with the aqueous solu⁃tion of imidazole and pyrrolidone penetrants(1∶1)can inhibit the gel of WPU,effectively solve the problem of white core problem,and improve the dye uptake.Adding ammonium sulfate in the later stage of dyeing can im⁃prove the dye uptake and K/S value of waterborne polyurethane microfiber leather.