ABSTRACT
Citric acid (CA)-crosslinked cotton fabrics show a yellowish appearance because CA forms C=C bonds during the heating process. The whiteness was improved by sodium hydrosulfite (Na2S2O4), which was confirmed by the Fourier transform infrared spectra. The computational calculations showed that Na2S2O4 is more effective than H2O2 when the system of CA-treated cotton is bleached. Based on the reaction mechanism of Na2S2O4 bleaching, the influences of Na2S2O4 concentration, bleaching temperature, bleaching time, bleaching pH on whiteness, and wrinkle recovery angle were investigated. The optional bleaching condition was 14% Na2S2O4 and sodium pyrophosphate (Na4P2O7), 70°C, and 40 minutes. The effect on the performance of fabrics bleached with Na2S2O4 was similar to the effect of non-formaldehyde crosslinker 1,2,3,4-butane tetracarboxylic acid (BTCA) and the widely used crosslinker dimethyloldihydroxyethyleneurea-treated cotton. CA-treated cotton bleached by Na2S2O4 showed a good persistence of bleaching effect.
摘要
柠檬酸 (CA) 交联棉织物在加热过程中形成C=C键, 出现泛黄现象. 通过傅立叶变换红外光谱证实, 连二亚硫酸钠 (Na2S2O4) 提高了白度. 计算结果表明, 在柠檬酸免烫棉织物漂白过程中, Na2S2O4比H2O2更有效. 从Na2S2O4漂白反应机理出发, 研究了Na2S2O4浓度, 漂白温度, 漂白时间和漂白pH值对白度和折皱回复角的影响. 最佳漂白条件为14%Na2S2O4和焦磷酸钠 (Na4P2O7), 70°C40分钟. Na2S2O4漂白后织物的性能类似于无甲醛交联剂1,2,3,4-丁烷四羧酸 (BTCA) 和广泛使用的交联剂 (DMDHEU) 处理过的棉织物. CA免烫的棉织物经Na2S2O4漂白后, 具有良好的持久漂白效果.
Acknowledgments
This work was financially supported by the Inner Mongolia University of Technology Undergraduate Training Program for Innovation and Entrepreneurship (2020183007) and Ph.D. Programs Foundation of Inner Mongolia University of Technology (DC2000001239).
Disclosure statement
No potential conflict of interest was reported by the author(s).