多羧基聚合物-锆配合物在无铬鞣制中的应用

Chrome-free Tanning by (Multi-carboxyl polymer)-z irconium Complex

以锆鞣坯革的收缩温度、柔软度、锆含量分布及纤维分散状况为评价指标,研究了不同相对分子质量及羧基含量的多羧基聚合物(OP)作为锆盐配体在无铬鞣制中的应用性能。当羧基含量相当时,OP配体的相对分子质量越小,锆配合物的鞣制性能越好。相比于相对分子质量,OP的羧基含量对锆配合物鞣制性能的影响更大。在本研究中,羧基含量适中的OP4-2(羧基含量4.65 mmol/g,Mn 3986 g/mol)作为锆盐配体,所得坯革的性能最佳,收缩温度达到86℃,柔软度最好,且坯革中的锆分布最均匀,纤维分散度也最高。

A series of multi-carboxyl polymer (OP) with varying molecular weights and carboxyl contents were used as ligands of zirconium salt in chrome -free tanning. The tanning performance of OP -Zr complex was evaluated by shrinkage temperature, softness, zirconium distribution and extent of fiber dispersion of the leather. When the carboxyl content of OP was similar, the lower molecular weight of OP resulted in better tanning performance. However, the carboxyl content of OP played a more essential role in the tanning performance compared with its molecular weight. In this study, OP4-2 with medium carboxyl content (carboxyl content 4.65mmol/g, Mn 3986g/mol) was chosen as the best ligand of zirconium sulfate, leading to the best comprehensive properties of the crust leather. The shrinkage temperature reached 86℃. Meanwhile, the crust leather showed the highest softness, the most uniform zirconium distribution and the highest extent of fiber dispersion.