淀粉接枝共聚荧光乳液的制备及性能研究

Preparation and Properties of Starch Graft Copolymer Fluorescent Emulsion

中文关键词:  高得率浆  返黄  荧光增白剂  淀粉  接枝共聚

Key Words:high yield pulp  yellowing  fluorescent brightner  starch  graft copolymerization

中文摘要:

      以4，4-二氨基二苯乙烯-2，2-二磺酸（DSD酸）为母体、三聚氯氰为桥联剂，通过亲核取代反应将二乙醇胺、N-羟甲基丙烯酰胺引入到DSD酸中，制得三嗪氨基二苯乙烯型荧光增白单体（FBs）；再以FBs、丙烯酰胺、苯乙烯为聚合单体与淀粉接枝共聚，制得淀粉接枝共聚荧光乳液（FBs-St）并用于纸张表面施胶。结果表明，共聚乳液FBs-St具有良好的紫外吸收、荧光发射以及荧光稳定性。FBs-St表面施胶纸样的抗张强度、撕裂度及抗水性均有明显提高；FBs-St表面施胶纸样的初始白度比空白纸样高11.4% ISO，且经48 h的紫外光老化后，表面施胶纸样比空白纸样的白度高13.3% ISO，返黄值低0.96，表明FBs-St乳液不仅能够提高纸张的白度，还对纸张返黄有很好的抑制作用。

Abstract:

      In this study， a new type of trizainyl aminostilbene fluorescent brighteners （FBs） based on 4，4-diaminostilbene-2，2-disulfonic acid （DSD acid） was synthesized by nucleophilic substitution reaction with cyanuric chloride as the crosslinking agent， diethanolamine and N-hydroxymethyl acrylamide as substituents. Then， using FBs， acrylamide， styrene as polymerization monomers and ammonium persulfate-sodium bisulfite as initiator to graft copolymerization with gelatinized starch to prepare starch graft copolymer fluorescent emulsion （FBs-St）. The results showed that the FBs-St had good UV absorption， fluorescence emission and fluorescence stability. The tensile strength， tear strength and water resistance of FBs-St sized paper sample were improved obviously. The initial brightness of FBs-St sized paper sample was 11.4% ISO higher than that of the control sample， and after 48 h of UV irradiation， the brightness of sized paper was 13.3% ISO higher than that of the control sample， and the PC value decreased by 0.96. It showed that FBs-St emulsion could not only improve the brightness of paper， but also have a better effect on anti-ultraviolet aging than traditional fluorescent brighteners.