两种光稳定剂复配使用对纸张光致返黄的抑制作用

Preliminary Studies on Prohibition of Paper Light-induced Yellowing by Using Mixtures of Stabilizers

关键词:  7-羟基-4-甲基香豆素  返黄抑制剂  紫外线吸收剂

Key Words:7-hydroxy-4-methyl coumarin  yellowing inhibitor  ultraviolet absorber

摘要:以间苯二酚和乙酰乙酸乙酯为原料，根据Pechmann法，在酸性条件下脱水缩合，反应合成了7-羟基-4-甲基香豆素。再以三聚氯氰和对氨基苯磺酸钠为原料，分别对7-羟基-4-甲基香豆素以及2，4-二羟基二苯甲酮进行水溶性改性。采用红外光谱对合成产物的结构进行表征，并用紫外光谱、荧光光谱探讨了其光学性质，通过紫外光加速老化实验考察了2种助剂单独使用以及按一定比例复配的应用效果。结果表明，经水溶性改性后的香豆素型荧光增白剂和紫外线吸收剂复配比单独使用时的抑制返黄效果更好，且能更好地发挥分子间的协同效应，二者均以0.8%的用量复配时能达到最佳的光稳定效果。

Abstract:According to the Pechmann method, 7-hydroxy-4-methyl coumarin fluorescent brightener was prepared by using resorcinol and ethyl acetoacetate as raw materials through dehydration condensation reaction under acid environment. The water solubility modification of 7-hydroxy-4-methyl coumarin fluorescent brightener and ultraviolet absorber 2,4-dihydroxy benzophenone was carried out by using cyanuric chloride and sodium sulfanilate as raw materials. The structures of target products were characterized by IR spectra, the optical properties were studied by UV spectra and fluorescence spectra. The ultraviolet accelerated yellowing inhibition performance by using the two prepared additives alone or their mixture in certain proportion was investigated by applying on the surface of the paper. The results showed that, the mixture of water-soluble coumarin fluorescent brightener and ultraviolet absorber hed a better yellowing inhibition and synergistic effect than using them separately, and the light stability showed that there was an ideal effect when the ratio of the two products was 1∶1.