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采用反相悬浮聚合法,以过硫酸钾为引发剂,N,N-亚甲基双丙烯酰胺为交联剂,通过多元聚合合成了丙烯酸/丙烯酰胺/2-丙烯酰胺基-2-甲基丙磺酸钠/甲基丙烯酸羟丙酯四元共聚高吸水性树脂。探讨了单体组成配比、反应温度、交联剂用量、引发剂用量等共聚反应条件对吸水性能的影响。结果表明,在聚丙烯酸系聚合大分子链上同时引入适当配比的磺酸基、丙烯酰胺基和羟基能产生良好的协同效应,有效提高树脂的耐盐性及吸水性能。所得产品的最高吸蒸馏水率和吸盐水率分别为690g/g和140g/g,热稳定性好。
By using the method of reversed-phase suspension polymerization, potassium persulfate as initiator and N, N-methylenebisacrylamide as crosslinking agent, acrylic acid / acrylamide / 2-acrylamido-2-methyl Sodium Propanesulfonate / Hydroxypropyl Methacrylate Copolymer Superabsorbent. The effects of copolymerization conditions such as monomer composition ratio, reaction temperature, the amount of cross-linking agent and initiator on the water absorption were discussed. The results showed that the synergistic effect of sulfonic acid groups, acrylamide groups and hydroxyl groups on the polyacrylic acid polymer chain can be simultaneously introduced to effectively improve the salt tolerance and water absorption of the resin. The highest distilled water yield and salt water absorption rate of the obtained products were 690g / g and 140g / g, respectively, with good thermal stability.