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以瓜尔胶(GG)、丙烯酸(AA)和黄土(LOESS)为原料,过硫酸铵(APS)为引发剂,N,N’-亚甲基双丙烯酰胺(MBA)为交联剂,采用水溶液聚合法制备了瓜尔胶接枝聚丙烯酸/黄土(GG-g-PAA/LOESS)复合高吸水性树脂。采用FTIR和SEM对其结构进行了表征,研究了LOESS的添加量对复合高吸水性树脂的溶胀能力和溶胀动力学的影响,考察了复合高吸水性树脂的保水性能、反复溶胀性以及在不同pH溶液中的吸水性能。结果表明,瓜尔胶、丙烯酸和LOESS发生了接枝共聚,体系中引入LOESS能够显著提高复合高吸水性树脂的吸水性能。当LOESS的质量分数为2%时,该树脂最高吸水倍率可达602 g/g,室温下6 d后,其保水率仍达28%,5次反复溶胀,吸水倍率仍能保持初始时的49%。此外,该复合高吸水性树脂还表现出优异的pH稳定性。
Using guar gum (GG), acrylic acid (AA) and loess as raw materials, ammonium persulfate (APS) as initiator and N, N’-methylenebisacrylamide (MBA) as crosslinking agent, A guar gum-grafted polyacrylic acid / loess (GG-g-PAA / LOESS) superabsorbent composite was prepared by aqueous solution polymerization. The structure of the superabsorbent composite was characterized by FTIR and SEM. The effects of the addition amount of LOESS on the swelling and swelling kinetics of the superabsorbent composite were investigated. The effects of the superabsorbent water holding capacity, Water absorption in pH solution. The results showed that guar gum, acrylic acid and LOESS graft copolymerization, the introduction of LOESS system can significantly improve the water-absorbing properties of the composite superabsorbent resin. When the mass fraction of LOESS is 2%, the maximum water absorption ratio of this resin is up to 602 g / g. After 6 days at room temperature, the water retention rate is still up to 28%. After repeated swelling for 5 times, the water absorption capacity can still keep 49 %. In addition, the composite superabsorbent also exhibits excellent pH stability.