凹凸棒石黏土冷冻-碾磨处理对复合高吸水树脂吸水性能的影响  

Effect of the Freezing-thawing Circles and Grinding Times of Attapulgite on Water Absorbency of Superabsorbent Composites

作　　者：陈红[1] 张俊平[1,2] 王爱勤[1,2] 

机构地区：[1]中国科学院兰州化学物理研究所盱眙凹土应用技术研发中心,甘肃兰州730000 [2]江苏省凹土资源利用重点实验室,江苏淮安223003

出　　处：《非金属矿》2011年第5期51-54,共4页Non-Metallic Mines

基　　金：江苏省重大创新载体建设项目(No.BY2010012);江苏省凹土资源利用重点实验室开放基金(HPK200901)资助

摘　　要：将凹凸棒石黏土(APT)经5次冷冻和碾磨处理后,以过硫酸铵为引发剂,N,N'-亚甲基双丙烯酰胺为交联剂,采用水溶液聚合法制备了羧甲基纤维素接枝聚丙烯酸/凹凸棒石黏土(CMC-g-PAA/APT)复合高吸水性树脂。考察了冷冻和碾磨处理次数对APT形貌、比表面积及其复合高吸水性树脂吸水倍率和吸水速率的影响,评价了复合高吸水性树脂在不同pH值溶液中的吸水性能。结果表明:随着碾磨次数的增加,APT的棒晶变短,比表面积呈减小趋势,平均孔径呈增大趋势。在相同添加量下,与没有碾磨的APT相比,碾磨10次APT制备的复合高吸水性树脂,吸水倍率增加了197 g/g,但其初始吸水速率最慢。碾磨APT制备的复合高吸水性树脂表现出更优异的pH值稳定性。A series of carboxymethyl cellulose-g-poly（acrylic acid）/attapulgite （CMC-g-PAAJAPT） superabsorbent composites were prepared by the solution grafting copolymerization of carboxymethyl cellulose （CMC） and acrylic acid （A_A） in the presence of attapulgite （APT） with grinding after five circles of freezing-thawing treatments. The effects of freezing-grinding times on the morphology and surface specific areas of APT as well as the swelling capability and rate of the corresponding superabsorbent composites were investigated, and the swelling properties of the composite in various pH value solutions were also evaluated. The results indicated that the surface specific areas and length of crystal bundles of APT decreases with increasing grinding times, while pore size increases constantly. At the same addition amount of APT, superabsorbent composite based on APT of ten times of grinding has the highest water absorbency, which was 197 g/g more than that of the superabsorbent composite based on ungrinded APT, but initial water absorption rate is the smallest. Moreover, the superabsorbent composites with grinding APT showed better pH-stability in various pH value solutions.

关 键 词：高吸水性树脂 凹凸棒石黏土 冷冻 碾磨 吸水性能 

分 类 号：TQ314.2[化学工程—高聚物工业]