Sutlović Ana, Glogar Martinia Ira, Čorak Ivana, Tarbuk Anita
Department of Textile Chemistry and Ecology, University of Zagreb Faculty of Textile Technology, Prilaz Baruna Filipovića 28a, HR-10000 Zagreb, Croatia.
Materials (Basel). 2021 Sep 30;14(19):5731. doi: 10.3390/ma14195731.
This article deals with cationization of cotton during mercerization and its effects on trichromatic vat dyeing. If cationization is carried out during the after-treatment, regardless of cotton pretreatment, the reaction takes place on the surface and blocks cellulose groups, subsequently resulting in uneven coloration. However, when cationization is carried out with an epihalohydrin during the mercerization process, new cellulose is formed in which the cationic compound is uniformly distributed and trapped between cellulose chains, resulting in uniform coloration after the dyeing process. The reaction time for the process during mercerization is 24 h, thus a more favorable process was researched. Based on electrokinetic analysis, it was found that 5 h was sufficient for the reaction with 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (CHPTAC). The cationization of cotton contributed to the processes of vat dyeing. The change in charge upon cationization resulted in very high adsorption of vat-dye anions, indicating that ionic bonding occurred in addition to van der Waals forces. The color depth improved by more than 10 times. It should be emphasized that the colors with higher chroma and targeted color hue, especially in trichromatic dyeing, were obtained on cationized cotton, in contrast to standard cotton fabrics. The color differences obtained under the different light sources indicate the occurrence of metamerism. Considering the color fastness to laundering, vat-dyed cationized fabrics of all colors may be used in hospitals or other environments where high hygiene and oxidative bleaching are required.
本文探讨了丝光处理过程中棉的阳离子化及其对还原染料三色染色的影响。如果在后处理过程中进行阳离子化，无论棉的预处理如何，反应都发生在表面并封闭纤维素基团，随后导致染色不均匀。然而，当在丝光处理过程中用表卤代醇进行阳离子化时，会形成新的纤维素，其中阳离子化合物均匀分布并被困在纤维素链之间，从而在染色后得到均匀的色泽。丝光处理过程中的反应时间为24小时，因此研究了一种更有利的工艺。基于动电分析，发现与3-氯-2-羟丙基三甲基氯化铵（CHPTAC）反应5小时就足够了。棉的阳离子化有助于还原染料染色过程。阳离子化时电荷的变化导致还原染料阴离子的吸附量非常高，这表明除了范德华力外还发生了离子键合。色深提高了10倍以上。应该强调的是，与标准棉织物相比，在阳离子化棉上获得了具有更高色度和目标色相的颜色，尤其是在三色染色中。在不同光源下获得的色差表明存在同色异谱现象。考虑到耐洗涤色牢度，所有颜色的还原染料染色阳离子化织物可用于医院或其他需要高卫生标准和氧化漂白环境的地方。
