Liu Xianxi, Zhang Fengxuan, Yu Lu, Zhao Qiangqiang, He Jinxin, Tang Hualiang, Dong Xia
National Engineering Research Center for Dyeing and Finishing of Textile, Donghua University, Shanghai 201620, PR China; College of Chemistry and Chemical Engineering, Donghua University, Shanghai, PR China.
Zhejiang R.G.B Textile Printing & Dyeing Co., Ltd, Shaoxing, Zhejiang 312071, PR China.
Int J Biol Macromol. 2025 Mar;297:139834. doi: 10.1016/j.ijbiomac.2025.139834. Epub 2025 Jan 12.
Cationic polymers have been used in the cationization of cotton fabrics for salt-free dyeing, but commonly used polymers are limited by their high molecular weight and low adsorption efficiency, leading to high dosage or complex modification conditions. In this study, polyallylamine with low molecular weight was found to be an efficient cationic agent for cotton modification and the modified fabrics can be salt-free dyed with different kinds of reactive dyes after the optimization of the modification process. Furthermore, the modification bath was reused by replenishing a small amount of cationic agent and adjusting the pH to the original level. The results showed that all the salt-free dyed cotton fabrics had excellent performance when the fabrics were modified with a 2 g L polyallylamine solution at pH 12 for 1 h. During five consecutive bath reusing cycles, the elemental nitrogen content, zeta potential, and salt-free dyeing performance of the modified cotton fabrics were relatively stable, all the uptakes of C.I. reactive red 24 were >75 %, and all the K/S values of the dyed fabrics were higher than 11, much greater than that of conventional dyeing (about 6). In addition, compared with the conventional dyeing process and the salt-free dyeing with the bath-unreused route, the bath-reused and salt-free dyeing process reduces by 98.36 % and 62.31 % chemicals consumption per kilogram of dyed cotton fabric, respectively. This work provides a low-pollution process for salt-free dyeing of cationic cotton fabrics and provides a reference for improving the utilization efficiency of the cationic agent.
阳离子聚合物已被用于棉织物的阳离子化以实现无盐染色，但常用聚合物受其高分子量和低吸附效率的限制，导致用量高或改性条件复杂。在本研究中，发现低分子量的聚烯丙胺是用于棉改性的有效阳离子剂，并且在优化改性工艺后，改性织物可用不同种类的活性染料进行无盐染色。此外，通过补充少量阳离子剂并将pH值调节至原始水平来重复使用改性浴。结果表明，当织物用2 g/L聚烯丙胺溶液在pH 12下改性1 h时，所有无盐染色的棉织物都具有优异的性能。在连续五个浴重复使用循环中，改性棉织物的元素氮含量、zeta电位和无盐染色性能相对稳定，C.I.活性红24的所有上染率均>75%，并且所有染色织物的K/S值均高于11，远高于传统染色（约6）。此外，与传统染色工艺和浴未重复使用路线的无盐染色相比，浴重复使用的无盐染色工艺每千克染色棉织物的化学品消耗量分别降低了98.36%和62.31%。这项工作为阳离子棉织物的无盐染色提供了一种低污染工艺，并为提高阳离子剂的利用效率提供了参考。
