新型返黄抑制剂的合成及性能研究

以三聚氯氰为交联单体，经过亲核取代反应将紫外吸收剂2,4-二羟基二苯甲酮和自由基捕获剂2,2’,6,6’-四甲基哌啶胺（4-氨基哌啶）依次引入到4,4’-二氨基二苯乙烯-2,2’-二磺酸类荧光增白剂分子中，合成双三嗪氨基二苯乙烯类新型返黄抑制剂。采用红外光谱、紫外光谱、荧光光谱分析方法对其结构及其光学性质进行了初步研究，并通过紫外光加速老化实验考察了目标产物对化机浆纸张的返黄抑制效果。结果表明，与普通商用荧光增白剂VBL相比，目标产物的光稳定效果更好、性质更优，涂布后纸样白度增加了9.4个百分点，经过72 h光老化处理后，纸样白度降低了10.0个百分点，分别比空白样、使用VBL的纸样少下降了10.2和 5.0个百分点，更适合作为光诱导返黄抑制剂。

Synthesis of a New Yellowing Inhibitor and Its Property

Using cyanuric chloride as the crosslinking monomer, a new yellowing inhibitor for high-yield pulp was synthesized by introducing the ultraviolet absorber 2,4-dihydroxy-benzophenone and free radicals capturer 4-amion-2,2,6,6-tetramentylniperidine to the same molecule of 4,4-diamino stilbene-2,2-disulfonic acid (DSD acid) through nucleophilicity reaction. Its structure and property were characterized by FT-IR, UV-vis and photoluminescence(PL) spectra, its anti-yellowing effect was evaluated by surface sizing on the handsheet of chemi-mechanical pulps and evaluated by the ultraviolet aging apparatus. The results showed that comparing with the traditional fluorescent brighteners, such as VBL, the brightening effect and light stability of the new compound are good, the brightness stabilizing effect increases significantly and paper brightness has 9.4 ISO points gain. Brightness loss of the hand-sheets treated by the new compound is 10.2 ISO points and 5.0 ISO points less than that of the blank sample and hand-sheets treated by VBL after 72 h UV accelerated irradiation, therefore it can be used as an effective yellowing inhibitior for lignin-containing paper products.