水溶性大分子紫外线吸收剂PVAm-g-BP-4的合成研究

合成了一类以2-羟基二苯甲酮为紫外线吸收功能基，以聚乙烯胺(PVAm)为接枝骨架的新型水溶性大分子紫外线吸收剂PVAm-g-BP-4。PVAm-g-BP-4合成分两步，首先将2-羟基-4-甲氧基-5-磺酸基二苯甲酮（BP-4）结构中磺酸基转变为磺酰氯，合成了反应中间体2-羟基-4-甲氧基-5-氯磺酰基二苯甲酮（CBP-4），采用二氯亚砜为反应溶剂和氯代试剂，N,N-二甲基甲酰胺（DMF）为催化剂，产率达94.5%。然后将CBP-4接枝到聚乙烯胺（PVAm）骨架上，合成PVAm-g-BP-4。目标产物经过TLC、IR、UV分析证明CBP-4已接枝到PVAm上。并优化了催化剂用量、反应温度、时间、溶剂比等反应条件。在棉织物上的初步应用表明，PVAm-BP-4可赋予其良好的紫外线防护功能，而且耐洗牢度优异。

Studies on synthesis of water-soluble macromolecular UV-absorber PVAm-g-BP-4

Novel water-soluble macromolecular UV absorber PVAm-g-BP-4 was synthesized with 2-hydroxybenzophenone as UV absorbing group and polyvinylamine (PVAm) as backbone. PVAm-g-BP-4 was synthesized through 2 steps. Reactive intermediate 2-hydroxy-4-methoxy-5-chlorosulfonylbenzophenone (CBP-4) was first synthesized from 2-hydroxy-4-methoxy-5-sulfo-benzophenone (BP-4) with thionyl chloride as chlorination agent and solvent and N, N-dimethylformamide (DMF) as catalyst, the yield of the intermediate could reach 94.5%. And then PVAm-g-BP-4 was synthesized by grafting CBP-4 onto PVAm. CBP-4 was confirmed to be grafted onto PVAm through TLC, IR and UV spectroscopy. The preparation conditions of the intermediate and product were optimized by studying the dosage of catalyst, reaction temperature, reaction time, solvents ratio, etc. Application of PVAm-BP-4 on cotton fibers shows it provides the fibers good anti-UV property and its wash fastness was satisfactory.