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以黄胞胶(XG)、丙烯酸(AA)为主要原料,N,N′-亚甲基双丙烯酰胺(MBAA)为交联剂,过硫酸铵(APS)为引发剂,合成了XG接枝AA高吸水性树脂。通过单因素试验研究了单体配比、中和度、引发剂用量、交联剂用量、反应时间和反应温度等对该树脂吸水性能的影响,采用正交试验法优选出最佳制备工艺条件,并对接枝共聚物的结构进行了表征。结果表明:影响树脂吸水性能的主要因素是引发剂用量、单体配比和交联剂用量;最佳制备工艺条件为m(AA)∶m(XG)=6∶1,AA中和度为60%,w(交联剂)=0.4%和w(引发剂)=1.0%(均相对于XG而言),反应温度为60℃;在此工艺条件下制取的树脂,其最大吸水倍率为904g/g;接枝共聚物在1630cm-1处出现C=O特征吸收峰,说明AA已成功接枝在XG链上。
XG grafting was synthesized using xanthan gum (XG), acrylic acid (AA) as main raw material, N, N’-methylenebisacrylamide (MBAA) as crosslinking agent and ammonium persulfate (APS) as initiator AA high water-absorbing resin. The effects of monomer ratio, neutralization degree, initiator dosage, crosslinking agent dosage, reaction time and reaction temperature on the water absorption of the resin were studied by single factor experiments. The optimum preparation conditions were optimized by orthogonal test , And the structure of the graft copolymer was characterized. The results showed that the main factors affecting the water absorption of the resin were the initiator dosage, the monomer ratio and the crosslinking agent dosage. The optimum preparation conditions were m (AA): m (XG) = 6:1, AA degree of neutralization 60%, w (crosslinker) = 0.4% and w (initiator) = 1.0% (all relative to XG) at a reaction temperature of 60 ° C .; resins prepared under these process conditions have a maximum water absorption capacity Was 904g / g. The graft copolymer showed the characteristic absorption peak of C = O at 1630cm-1, indicating that AA was successfully grafted onto the XG chain.