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冷冻–碾磨处理凹凸棒石黏土对复合高吸水性树脂性能的影响
作者:陈红1 2 王文波1 张俊平1 3 王爱勤1 3 
单位:1. 中国科学院兰州化学物理研究所 兰州 730000 2. 中国科学院研究生院 北京 100049 3. 江苏省凹土资源利用重点实验室 江苏 淮安 223003 
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
出版年,卷(期):页码:2010,38(11):2148-2153
DOI:
摘要:

将凹凸棒石黏土(attapulgite,ATP)经冷冻和碾磨处理后,采用羧甲基纤维素为基质,丙烯酸为单体和不同碾磨次数的ATP为无机组分,通过水溶液聚合法制备了羧甲基纤维素接枝聚丙烯酸/凹凸棒石黏土复合高吸水性树脂,考察了冷冻和碾磨处理对ATP的形貌、理化性质及对复合高吸水性树脂的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溶液中的吸水性能。结果表明:经碾磨处理后,ATP的比表面积和孔容先降低后升高,而后趋于不变,平均孔径呈先增大后减小趋势。在相同添加量下,碾磨不同次数的ATP比表面积越大,复合树脂的吸水倍率越低,但吸水速率越快。此外,复合吸水树脂表现出优异的pH稳定性。

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A series of carboxymethyl cellulose-g-poly(acrylic acid)/attapulgite (CMC-g-PAA/ATP) superabsorbent composites were prepared by solution grafting copolymerization of carboxymethyl cellulose and acrylic acid in the presence of freezing–grinding modified attapulgite. The effects of freezing–grinding modification on the morphologies, physical properties of ATP 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 solutions were also evaluated. The results showed that the specific surface area and pore volume firstly decreased, and then increased and finally kept constant. The pore size initially increased and then decreased. At the same addition amount of ATP, the greater specific surface area is always corresponding to lower water absorbency and higher water absorption rate. In addition, the superabsorbent composites showed excellent pH-stability in various pH solutions.

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基金项目:
国家“863”项目(2006AA03Z0454);江苏省凹土资源利用重点实验室开放基金(HPK200901)资助项目
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参考文献:

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