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以凹凸棒黏土(APT)和2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为原料,过硫酸钾(KPS)为引发剂,N,N’-亚甲基双丙烯酰胺(NMBA)为交联剂,采用微波辐射法接枝共聚合成了APT-g-PAMPS耐盐性复合高吸水性树脂,用FTIR和XRD对复合吸水性树脂的结构进行了表征。考察了微波功率和时间及APT用量对树脂吸水倍率的影响,测定了不同APT用量高吸水性树脂的吸水速率、保水性能及反复吸水性能。FTIR和XRD结果显示,APT和有机单体之间发生了接枝共聚反应,其反应仅在APT的表面进行,单体并没有插入到APT的层间。结果表明,微波功率为195 W,辐射时间为2.5 min,w(APT)=5%时,树脂在去离子水和生理盐水中的吸水倍率分别为987g/g和102 g/g。该复合高吸水性树脂具有较快的吸水速率、较强的保水性能和较好的反复吸水性能。在体系中引入适量APT能够显著提高复合吸水树脂的吸水能力和耐盐性能,同时能明显加快树脂的吸水速率和提高树脂的保水性能。
Using N, N’-methylene-bis-acrylamide (NMBA) as initiator and attapulgite clay (APT) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) as raw materials, potassium persulfate ) As crosslinker, the APT-g-PAMPS salt-tolerant superabsorbent polymer was grafted by microwave irradiation. The structure of the composite water-absorbent resin was characterized by FTIR and XRD. The effects of microwave power and time and the amount of APT on the water absorption ratio of the resin were investigated. The water absorption rate, water holding capacity and water absorption capacity of the superabsorbent resin with different APT dosage were measured. The results of FTIR and XRD showed that graft copolymerization occurred between APT and organic monomer, and the reaction was only on the surface of APT. The monomer was not inserted into the layer of APT. The results showed that the absorbency of resin in deionized water and saline were 987 g / g and 102 g / g, respectively, at a microwave power of 195 W, an irradiation time of 2.5 min and an APT of 5%. The composite superabsorbent resin has faster water absorption rate, stronger water retention capacity and better water absorption performance. The introduction of the proper amount of APT in the system can significantly improve the water absorption capacity and salt tolerance of the composite water-absorbing resin, meanwhile, it can obviously speed up the water absorption rate of the resin and improve the water-holding property of the resin.