水溶性紫外线吸收剂与萘酰亚胺荧光增白剂协同使用的抑制返黄研究

Study on Synergistic Use of Water-soluble UVA and Naphthalimide Fluorescent Brighteners in Inhibition of Yellowing

关键词:  萘酰亚胺  紫外线吸收剂  抑制返黄  复配

Key Words:naphthalimide  ultraviolet absorber  inhibition of yellowing  blend

摘要:以4-溴-1,8-萘酐为原料，与乙醇胺进行酰胺化，再在萘环4-位引入乙氧基供电子基团合成了萘酰亚胺荧光增白剂(FBA)。以三聚氯氰为交联单体，用对氨基苯磺酸钠对紫外线吸收剂（UVA）2,4-二羟基-二苯甲酮进行了水溶性改性。采用红外光谱对目标产物进行了结构表征，运用紫外光谱、荧光光谱测试其光学性质。将制备的两种助剂单独或二者按一定比例复配涂布于纸张表面，通过紫外光加速返黄实验考察其对纸张的返黄抑制效果。结果表明,复配使用的萘酰亚胺FBA和水溶性UVA可以更好地发挥二者分子间的协同效应，返黄抑制效果优于单独使用，且m（萘酰亚胺）∶m（水溶性UVA）为1∶3时能达到最佳的抑制返黄效果。

Abstract:Naphthalimide fluorescent brightening agent(FBA) was synthesized using 4-bromo-1,8-naphthalic anhydride as raw material through amidation with ethanolamine, then introducing ethoxy electron-donating group into 4-bit of naphthalene ring. With cyanuric chloride as the crosslinking monomer, the water-solubility of ultraviolet absorber (UVA) 2,4-dihydroxy-benzophenone was modified by sodium p-aminobenzenesulfonate. The molecular structures were characterized by IR spectra；optical properties were measureed by UV spectra and fluorescence spectra. Coating the two prepared additives alone or blends of them with a certain proportion on the surface of the paper, the ultraviolet accelerated yellowing inhibition performance of them were studied. The results showed that: the blends of naphthalimide fluorescent brighteners and water-soluble UVA have better synergistic effect, have more excellent yellowing inhibition effect than them used alone, and the optimum ratio of fluorescent brighteners and UVA is 1∶3.