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采用亚硫酸氢钠-过硫酸铵氧化还原引发体系,以水溶液聚合合成了凹凸棒-膨润土-聚丙烯酸钠三元复合吸水树脂(SAPC)。研究了复合粘土用量、粘土配比对聚合反应速率的影响,以及影响SAPC吸水速率的因素。结果表明,粘土会加快引发体系生成自由基的速率,但会降低链增长反应速率,膨润土对丙烯酸钠自由基聚合的阻碍作用比凹凸棒更明显。将膨润土和凹凸棒复合,可发挥两者间的协同作用,在保持高平衡吸水率的同时,提高吸水速率。最优SAPC吸水速率的组成为:m(凹凸棒)∶m(膨润土)=2∶1,交联剂用量为0.07%,氧化剂用量为0.8%,中和度为90%。
Adopting sodium bisulfite - ammonium persulfate redox initiating system, attapulgite - bentonite - sodium polyacrylate ternary composite absorbent resin (SAPC) was synthesized by aqueous solution polymerization. The effects of the amount of composite clay and the proportion of clay on the polymerization rate and the factors affecting the water absorption rate of SAPC were studied. The results show that clay accelerates the rate of free radical generation in the system, but decreases the chain growth reaction rate. The inhibition effect of bentonite on sodium acrylate free radical polymerization is more obvious than that of attapulgite. Bentonite and attapulgite composite, can play the synergy between the two, while maintaining a high equilibrium water absorption, while increasing the water absorption rate. The optimum SAPC water absorption rate is: m (attapulgite): m (bentonite) = 2: 1, crosslinker dosage 0.07%, oxidant dosage 0.8%, degree of neutralization 90%.