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存放会变黄，尼龙纤维与木材或粗纸逐渐产生的各种芳香族醛发生反应。一般来说，在纺织领域，甲醛是防止尼龙制品变黄的有用试剂，但它也是引起病态建筑综合征的主要材料之一。本文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，在含氢亚硫酸钠的有机溶剂或水溶液中与还原糖反应，最有效地防止了尼龙纤维在与芳香醛中的一种香草醛反应时变黄，以及在与类黑素反应时变褐。

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.