一种新型光稳定剂的合成及应用

A New Type of Light-induced Yellowing Prohibitor—Synthesis and Application

关键词:  香豆素  紫外线吸收剂  光稳定剂  白度稳定性

Key Words:coumarin  ultraviolet absorber  light stabilizer  brightness-stability

摘要:采用Pechmann法，乙酰乙酸乙酯和间苯二酚在酸性条件下发生脱水缩合反应生成了7-羟基-4-甲基香豆素荧光增白剂。再以三聚氯氰为交联单体，经过亲核取代反应将7-羟基-4-甲基香豆素荧光增白剂、紫外线吸收剂2,4-二羟基二苯甲酮以及自由基捕获剂2,2’,6,6’-四甲基哌啶胺依次引入到同一分子中，合成了7-羟基-4-甲基香豆素类新型光稳定剂。采用红外光谱对其结构进行表征，采用紫外光谱、荧光光谱分析方法对其光学性质进行了初步分析，并通过紫外光加速老化实验考察了新型光稳定剂对纸张的返黄抑制效果。结果表明，合成的新型光稳定剂具有较好的返黄抑制效果，其返黄抑制作用优于单独使用7-羟基-4-甲基香豆素荧光增白剂的。

Abstract:The 7-hydroxy-4-methyl coumarin fluorescent brightener was prepared based on the Pechmann method, a new 7-hydroxy-4-methyl coumarin light-induced yellowing prohibitor was synthesized by introducing 2,4-dihydroxy-benzophenone (an ultraviolet absorber) and 4-amion-2,2′,6,6′-tetramentylniperidine (a free radicals capturer) into the molecule of 7-hydroxy-4-methyl coumarin fluorescent brightener, using cyanuric chloride as the cross-linking monomer. The structure of the new compound was characterized by FT-IR, UV-vis and photoluminescence(PL) spectrum-meters, its brightness-stabilizing effect on paper was evaluated by means of the ultraviolet aging apparatus. Results showed that, the new synthesized Light-induced Yellowing Prohibitor was more effective on yellowing-inhibition comparing with 7-hydroxy-4-methyl coumarin fluorescent brightener.