凹凸棒黏土纯度对复合高吸水性树脂吸水性能的影响  

Influence of the Purity of Attapulgite on Water Absorbency of Carboxymethyl-cellulose Sodium/Poly(acrylic acid)/Attapulgite Superabsorbent Composites

作　　者：陈红[1,2] 王文波[1] 王爱勤[1] 

机构地区：[1]中国科学院兰州化学物理研究所,甘肃兰州730000 [2]中国科学院研究生院,北京100049

出　　处：《精细化工》2011年第4期328-332,共5页Fine Chemicals

基　　金：国家高技术研究发展计划(863计划)项目(2006AA03Z0454);中国科学院"西部行动"计划项目(KGCX2-YW-501)~~

摘　　要：将凹凸棒黏土分级处理后,以不同纯度的凹凸棒黏土为无机组分,过硫酸铵为引发剂,N,N'-亚甲基双丙烯酰胺为交联剂,制备了羧甲基纤维素接枝丙烯酸/凹凸棒黏土复合高吸水性树脂,考察了复合高吸水性树脂的吸水倍率、吸水速率和在不同pH介质中的溶胀性能。红外光谱表明,丙烯酸已接枝到羧甲基纤维素的骨架上,凹凸棒黏土参与了聚合反应。扫描电镜观察表明,凹凸棒黏土在高吸水性树脂中有良好的分散性能,改善了基体表面的多孔结构。研究表明,在相同添加量下,凹凸棒黏土中含有更多的Ca2+和Mg2+离子,有助于改善复合高吸水性树脂的综合性能。Carboxymethylcellulose sodium-g-poly（acrylic acid）/attapulgite superabsorbent composites were prepared by aqueous solution polymerization,using N,N′-methylenebisacrylamide as crosslinker and ammonium persulfate as an initiator in the presence of different purity of attapulgite.The influence of the purity of attapulgite on water absorbency,water absorption rate and swelling properties in different pH medium were studied.FTIR spectra demonstrates that acrylic acid monomers were grafted onto the backbone of carboxymethylcellulose sodium backbone,and attapulgite participated in polymerization through its active silanol groups.FESEM observation shows that attapulgite fibrils led to a better dispersion in the polymeric matrix and improved the surface porous structure of the matrix.More Ca2＋ and Mg2＋ in attapulgite are conducive to improving the swelling behaviors of the superabsorbent composites with the same content of attapulgite.

关 键 词：高吸水性树脂 凹凸棒黏土 吸水性能 溶胀性能 功能材料 

分 类 号：TQ314.2[化学工程—高聚物工业]