摘要
以羧甲基纤维素钠(CMC)和丙烯酸(AA)为原料,过硫酸钾(KSB)为引发剂,N,N-亚甲基双丙烯酰胺(MBA)为交联剂,采用水溶液聚合法,制备了CMC-AA高吸水树脂;并在此基础上,向反应体系中引入氢氧化钾和尿素,分别制备出功能型复合吸水树脂K-CMC-AA、UREA-CMC-AA。通过单因素试验,确定了KOH和尿素的最佳用量;采用扫描电子显微镜、傅里叶红外光谱对树脂产品形貌结构等进行了表征;利用动力学模型对其吸水过程进行拟合,探讨了其吸附过程及机理;研究了UREA-CMC-AA在水中的氮素缓释性能。结果表明:当KOH中和比为10%时,K-CMC-AA在0.9%NaCl中的吸水倍率为285.06g/g,比CMC-AA提高了约80%;当尿素与单体CMC质量比为1∶1时,树脂的吸水(盐水)率最高,同时树脂还具有很好的氮素缓释功能;3种树脂产品在蒸馏水或盐溶液中的吸水动力学可用准二级动力学方程描述。
The carboxymethyl cellulose(CMC)and acrylic acid(AA)were used as raw materials,potassium persulfate(KSB)as the initiator,N,N-methylene diacrylamide(MBA)as crosslinking agent,and the water solution polymerization was adopted to prepare the CMC-AA high absorbent resin.On this basis,potassium hydroxide and UREA were introduced into the reaction system,and functional composite absorbent resin K-CMC-AA and UREACMC-AA were prepared respectively.The optimal dosages of KOH and urea were determined by single factor experiment.The morphology and structure of products were characterized by scanning electron microscope(SEM)and Fourier infrared spectroscopy(FT-IR).The adsorption process and mechanism of the adsorption process were discussed by using kinetic model.The sustained release properties of UREA-CMC-AA in water were studied.The results showed that:when the blending ratio of KOH were 10%,the water absorption ratio of K-CMC-AA in 0.9%NaCl was285.06 g/g,which was about 80%higher than CMC-AA.When the quality ratio of urea and monomer CMC was 1∶1,the water absorption(brine)rate of the resin was the highest,while the resin also has good nitrogen release function.The water absorption kinetics of three kinds of products in distilled water or salt solution can be described by quasisecond-order kinetic equation.
作者
郑优萍
郁丽萍
雷雨坤
夏世斌
Zheng Youping;Yu Liping;Lei Yukun;Xia Shibin(School of Resource and Environment Engineering,Wuhan University of Technology,Wuhan430070;Ezhou Environmental Protection Monitoring Station,Ezhou436000)
出处
《化工新型材料》
CAS
CSCD
北大核心
2019年第9期232-236,共5页
New Chemical Materials
基金
国家重点研发计划项目(2016YFC0502402)
关键词
高吸水树脂
吸水性能
缓释氮素
super absorbent resin
water absorption
slow release of nitrogen
