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利用无机粘土矿物与烯类单体的接枝共聚反应制备复合高吸水性树脂,具有改善树脂吸水性能、增强凝胶强度、降低产品成本的优点。以高岭土、壳聚糖和丙烯酸为原料,在水溶液中通过接枝共聚反应合成了壳聚糖接枝共聚丙烯酸/高岭土复合吸水树脂。以丙烯酸量为基准,研究了交联剂、引发剂、壳聚糖、高岭土等与丙烯酸的不同质量比对复合树脂吸水倍率的影响。红外光谱分析结果表明,丙烯酸、壳聚糖和高岭土共同参与了接枝聚合反应。以过硫酸胺为引发剂,N,N-亚甲基双丙烯酰胺为交联剂,丙烯酸中和度为70%,引发剂用量0.3%,交联剂用量为0.05%,壳聚糖与丙烯酸的质量比为0.13,高岭土与丙烯酸质量比为0.13时,高吸水性树脂具有较好的综合吸液性能。
The preparation of composite superabsorbent by graft copolymerization of inorganic clay minerals and vinyl monomers has the advantages of improving the water absorbency of the resin, increasing the gel strength and reducing the product cost. Using kaolin, chitosan and acrylic acid as raw materials, chitosan graft copolymerization acrylic acid / kaolin composite water-absorbing resin was synthesized by grafting copolymerization in aqueous solution. Based on the amount of acrylic acid, the effect of different mass ratio of crosslinking agent, initiator, chitosan, kaolin and acrylic acid on water absorption ratio of composite resin was studied. The results of FTIR analysis showed that acrylic acid, chitosan and kaolin all participated in the graft polymerization. Using ammonium persulfate as initiator and N, N-methylene bisacrylamide as cross-linking agent, the degree of neutralization of acrylic acid was 70%, the amount of initiator was 0.3%, the amount of cross-linking agent was 0.05%, the ratio of chitosan to acrylic acid Of the mass ratio of 0.13, kaolin and acrylic acid mass ratio of 0.13, the high water-absorbing resin has a better overall liquid absorption properties.