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以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、丙烯酰胺(AM)和海泡石黏土(ST)为原料,采用微波辐射方法制备了ST接枝P(AMPS-co-AM)耐盐性高吸水性树脂,考察了海泡石用量、无机盐溶液金属离子价态和浓度对树脂吸水倍率的影响,研究了树脂的吸水速率和保水性能。用FTIR、XRD、SEM对吸水性树脂进行了表征。结果表明,树脂的吸水倍率随着无机盐溶液浓度的增加而减小,在不同价态金属离子盐溶液中,树脂的吸水倍率顺序为NaCl>CaCl2>FeCl3,在体系中适量地引入ST能显著提高树脂的吸水能力,树脂具有较快的吸水速率和良好的保水性能。FTIR和XRD表明,ST和有机单体之间发生了接枝共聚反应,部分单体插入到ST的层间形成插层型复合高吸水性树脂,SEM显示树脂具有多孔的层状结构。
ST graft P (AMPS-co-AM) was prepared by microwave irradiation using 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylamide (AM) and sepiolite clay (ST) ) Salt-tolerant superabsorbent resin, the effects of dosage of sepiolite, valence and concentration of metal ion in inorganic salt solution on water absorption ratio of resin were investigated, and the water absorption rate and water holding capacity of resin were studied. The water-absorbent resin was characterized by FTIR, XRD and SEM. The results showed that the water absorption capacity of the resin decreased with the increase of the concentration of inorganic salt solution. In different metal ion salt solutions, the order of the water absorption capacity of resin was NaCl> CaCl2> FeCl3, and proper introduction of ST into the system was significant Improve the resin’s water absorption capacity, the resin has a faster water absorption rate and good water retention properties. FTIR and XRD showed that grafting copolymerization occurred between ST and organic monomers. Some monomers were inserted into the interlayers of ST to form intercalated superabsorbent polymers. SEM showed that the resin had a porous lamellar structure.