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兴发pt登录学报, 2019, 36(5): 64-69     https://doi.org/10.16039/j.cnki.cn22-1249.2019.05.016
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聚丙烯酸超吸水凝胶的制备及其吸水性与耐盐性研究
刘梦竹,相昌荣,王鑫,路大勇,王永鹏
兴发pt登录 材料科学与工程学院
Preparation of Polyacrylic Acid Hydragel and Research of its Water Absorbency&Salt-tolerance
LIU Mengzhu, XIANG Changrong, WANG Xin, LU Dayong, WANG Yongpeng
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摘要 

利用水溶液聚合法合成一种成本低廉的聚丙烯酸超吸水凝胶(SAP)并测试其吸水性及耐盐性。结果表明,该树脂在水及盐溶液中均具有较高的吸水率,分别为220 g/g和36g/g。60℃高温保水性实验表明,该树脂在高温下可持续保水720分钟以上。重复吸放五次后,吸附量仍可分别达到第一次吸附量的95.55%和90.12%,循环吸附性能良好。吸水能力较强,是树脂中亲水性基团与网格内渗透压共同作用的结果。离子的存在是吸水倍率下降的主要原因,但仍表现出高吸水性质,表明聚丙烯酸树脂具有一定耐盐性。对该树脂在水及盐溶液中的吸附动力学和扩散动力学的研究表明,吸附动力学均属于伪二阶动力学模型,即过程为自发、放热过程。扩散动力学机理表明,聚丙烯酸在水中符合 non-Fickian 扩散,是具有较快吸附速率的主要原因;在0.9wt%NaCl溶液中符合Fickian 扩散,即金属离子向聚合物中的扩散起主导作用。这种具有高吸水性能、良好保水性能的水凝胶有望作为保水剂应用于农业,园林等领域。

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刘梦竹
相昌荣
王鑫
路大勇
王永鹏
关键词:  聚丙烯酸  超吸水凝胶  耐盐性  吸水性  动力学     
Abstract: 

A low cost polyacrylate superabsorbent hydrogel (SAP) was synthesized by aqueous solution polymerization. Its absorbency and salt-tolerance were studied subsequently. The results showed that the resin had a high water absorption rate of 220 g/g and 36g/gin water and salt solution, respectively. Then the hydrogel was suffered 60 ℃ high temperature to characterize the water retention. It showed that the resin have the ability to sustain water more than 720 minutes at high temperature. After repeated adsorption and discharge for five times, the adsorption amount can still reach 95.55% and 90.12% of the first adsorption amount respectively, demonstrating a good recycling adsorption performance. The high water absorbency was due to the synergistic effect of hydrophilic groups in the resin and osmotic pressure in the mesh. The presence of ions is the main reason for the decrease of water absorption ratio, but it still showed a high water absorption property, indicating that polyacrylic resin has a certain salt tolerance. The adsorption kinetics and diffusion kinetics of the resin in water and salt solution were studied. The diffusion kinetics showed that the polyacrylic acid in water was non-fickian diffusion, which was the main reason for the fast adsorption rate. Fickian diffusion was consistent in 0.9wt%NaCl solution, that is, metal ions played a leading role in the diffusion of polymer. The hydrogels with high water absorption and good water retention properties are expected to be used as water retention agents in agriculture, gardens and other fields.

Key words:  polyacrylic acid    superabsorbent hydrogel    salt-tolerance    water absorbency    adsorption kinetics
               出版日期:  2019-05-25      发布日期:  2019-05-25      整期出版日期:  2019-05-25
ZTFLH:  O648.17  
引用本文:    
刘梦竹, 相昌荣, 王鑫, 路大勇, 王永鹏. 聚丙烯酸超吸水凝胶的制备及其吸水性与耐盐性研究 [J]. 兴发pt登录学报, 2019, 36(5): 64-69.
LIU Mengzhu, XIANG Changrong, WANG Xin, LU Dayong, WANG Yongpeng. Preparation of Polyacrylic Acid Hydragel and Research of its Water Absorbency&Salt-tolerance . Journal of Jilin Institute of Chemical Technology, 2019, 36(5): 64-69.
链接本文:  
http://xuebao.jlict.edu.cn/CN/10.16039/j.cnki.cn22-1249.2019.05.016  或          http://xuebao.jlict.edu.cn/CN/Y2019/V36/I5/64
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