基于二苯乙烯荧光增白型返黄抑制剂的合成及应用

以4,4'-二氨基二苯乙烯-2,2'-二磺酸(简称DSD酸)为原料,用三聚氯氰为交联单体,将紫外线吸收剂2,4-二羟基-二苯甲酮与二苯乙烯型荧光增白剂引入同一分子中,再引入牛磺酸,经过亲核取代等设计出既含有荧光增白基团又具备紫外光吸收功能的双三嗪氨基二苯乙烯荧光增白型返黄抑制剂。采用红外光谱和核磁共振波谱、紫外光谱、荧光光谱分析方法对其结构及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。实验结果表明,合成的目标产物在涂布中的最佳用量为1.0%(质量分数,下同),经过72 h光老化处理后,合成的产物光抑制效果更好,更适合作光诱导返黄抑制剂,与单独使用荧光增白剂和紫外光吸收剂相比,老化后纸张的白度分别少下降了4.74% ISO和4.15% ISO。

Synthesis and Application of Yellowing Inhibitor Based on triazine-stilbene Fluorescent Brightening Agents

With cyanuric chloride as the crosslinking monomer and 4,4′-diamino stilbene-2,2′-disulfonic acid(DSD acid) as raw materials,a new yellowing inhibitor for high-yield pulp was synthesized through joining the ultraviolet absorber 2,4-dihydroxy-benzophenone and triazine-stilbene fluorescent brighteners in the same molecule by nucleophilic substitution method.The new product had the function of fluorescent whitening and absorbing ultraviolet.Its structure was characterized by means of FTIR and 1HNMR,its physical properties were examined by UV-vis and photoluminescence(PL) spectra,and its anti-yellowing effect was evaluated when used as the surface sizing agent on handsheet of chemimechanical pulps by using the ultraviolet aging apparatus.The results show that the best dosage of the new yellowing inhibitor was 1.0%(mass fraction) and it could be proposed as an applicable yellowing inhibitor for lignin-content paper products.Besides,the brightening ability of the product with chemimechanical pulp handsheets was increased more by application of the new yellowing inhibitor as surface sizing agent than that by application of fluorescent brighteners or ultraviolet absorber alone respectively,and the decline of brightness of hand-sheets treated by new yellowing inhibitor was 4.74%ISO and 4.15%ISO less than that with hand-sheets treated by them after 72 h UV accelerated irradiation.