Abstract

Antioxidants can inhibit the photofading of natural dyes. However, their effects on improving the light fastness of fabrics dyed with natural dyes are still limited since no stable covalent bonds formed between their molecules and the substrate in the conventional dipping and padding method. In this study, one antioxidant, gallic acid, was grafted to chitosan via the redox reaction between ascorbic acid and hydrogen peroxide. The grafted chitosan was then cross-linked onto cotton fabric dyed with gardenia yellow. Results of colour change caused by the exposure of treated fabric to simulated sunlight irradiation show that gallic acid grafted chitosan (GA-g-CTS) inhibited photofading of gardenia yellow on cotton. Results from handle test show that although the softness of cotton fabric cross-linked with GA-g-CTS slightly deteriorated, the overall handle of the treated fabric was not distinctly affected.

摘要

抗氧化剂可以抑制天然染料的光衰。然而，由于传统的浸轧方法中它们的分子与基材之间没有形成稳定的共价键，因此它们对提高天然染料染色织物的耐光牢度的作用仍然有限。在这项研究中，一种抗氧化剂没食子酸通过以下方式接枝到壳聚糖上抗坏血酸和过氧化氢之间的氧化还原反应。然后将接枝的壳聚糖交联到用栀子黄染色的棉织物上。处理过的织物暴露在模拟阳光照射下引起的颜色变化结果表明，没食子酸接枝壳聚糖 (GA-g-CTS) 抑制了棉花上栀子黄的光褪色。手感测试结果表明，虽然GA-g-CTS交联的棉织物柔软度略有下降，但处理后织物的整体手感没有明显影响。