Development of formaldehyde-free technics for anti-yellowing finishing of nylon fibers

众所周知，尼龙纤维在木箱或瓦楞纸箱中长期储存时会变黄，尼龙纤维在木箱或瓦楞纸箱中与逐渐从木材或原纸中产生的各种芳香醛发生反应。一般来说，在纺织领域，甲醛是防止尼龙产品变黄的有用试剂，但它也是导致病态建筑综合症的主要材料之一。在本工作中，我们研究了尼龙纤维与各种还原糖的反应条件，以防止尼龙纤维因芳香醛而变黄。结果表明，在有机溶剂或含亚硫酸钠的水溶液中与还原糖反应，最有效地防止了尼龙纤维不仅因与芳香醛之一香兰素反应而变黄，而且还因副反应类黑素反应而变棕色。

It is well known that nylon fibers turn yellow during long storage in wooden boxes or corrugated cartons, where the nylon fibers react with various aromatic aldehydes gradually generated from wood or crude paper. In general, in the textile fields, formaldehyde is a useful reagent to prevent nylon products from turning yellow, but it is also one of the main materials causing the sick building syndrome. In this work, we investigated reaction conditions between nylon fibers and various reducing sugars to prevent nylon fibers from turning yellow due to aromatic aldehydes. As a result, the reaction with reducing sugar in organic solvent or water solution containing sodium hydrosulfite prevented the nylon fibers most effectively from being changed not only to yellow by the reaction with vanillin, one of aromatic aldehydes, but also to brown by the melanoidin reaction as a side reaction.