College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China.
College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China; College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China.
J Environ Manage. 2024 Aug;366:121894. doi: 10.1016/j.jenvman.2024.121894. Epub 2024 Jul 19.
The leather manufacturing industry is increasingly embracing chrome-free tanning methods to promote environmental sustainability. However, the transition to chrome-free tanning systems presents a notable obstacle: the incompatibility of traditional anionic wet finishing materials with chrome-free tanned leather due to differences in surface electrical behavior. Herein, an amphoteric polymer, referred to P(AA-co-DMAEMA-co-DA), was synthesized through a simple one-step free radical copolymerization using acrylic acid (AA), dimethylaminoethyl methacrylate (DMAEMA), and dodecyl acrylate (DA). Notably, the isoelectric point of P(AA-co-DMAEMA-co-DA) is 7.7, which contributes to improving the leather's positive electric property and enhancing the binding between the amphoteric polymer fatliquors (APF) and collagen fiber. The APF achieves a remarkable absorption rate of 96.2% and a dyeing uptake rate of 94.3% for anionic dyes, resulting in a uniformly bright surface color of the dyed leather and further significantly reducing the dye usage. Overall, the comprehensive properties of APF align with the electrical origins of organic chrome-free tanning leather, exhibiting a pronounced fatliquoring effect while reducing the dye content in the waste liquor. This contribution holds promise for advancing chrome-free tanning technology toward greener environmental practices.
制革行业越来越多地采用无铬鞣制方法，以促进环境可持续性。然而，向无铬鞣制系统的转变面临着一个显著的障碍：由于表面电行为的差异，传统的阴离子湿整理材料与无铬鞣制皮革不相容。在此，通过使用丙烯酸 (AA)、二甲基氨基乙基甲基丙烯酸酯 (DMAEMA) 和十二烷基丙烯酸酯 (DA) 的简单一步自由基共聚合成了两性聚合物，称为 P(AA-co-DMAEMA-co-DA)。值得注意的是，P(AA-co-DMAEMA-co-DA)的等电点为 7.7，有助于改善皮革的正电性，并增强两性聚合物加脂剂 (APF) 和胶原蛋白纤维之间的结合。APF 对阴离子染料的吸收率达到 96.2%，上染率达到 94.3%，使染色皮革的表面颜色均匀亮丽，并进一步显著降低了染料用量。总体而言，APF 的综合性能与有机无铬鞣制皮革的电起源相吻合，在降低废液中染料含量的同时表现出显著的加脂效果。这一贡献有望推动无铬鞣制技术向更环保的实践方向发展。
