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Preparation and Properties of Starch Graft Copolymer Fluorescent Emulsion
Received:September 20, 2020  
DOI:10.11981/j.issn.1000-6842.2020.04.08
Key Words:high yield pulp;yellowing;fluorescent brightner;starch;graft copolymerization
Fund Project:国家自然科学基金项目(31670596);陕西省轻化工助剂重点实验室开放基金(13SJ019)。
Author NameAffiliationE-mail
ZHANG Guanghua* Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi’an, Shaanxi Province, 710021 zhanggh@sust.edu.cn 
NI Meile Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi’an, Shaanxi Province, 710021  
GUO Mingyuan College of Chemistry and Materials Science, Weinan Normal University, Weinan, Shaanxi Province, 714099  
TANG Jinxia Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi’an, Shaanxi Province, 710021  
LIU Jing Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi’an, Shaanxi Province, 710021  
LUO Jie Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi’an, Shaanxi Province, 710021  
YANG Dongdong Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi’an, Shaanxi Province, 710021  
WANG Fan Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi’an, Shaanxi Province, 710021  
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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.
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