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林产化学与工业 ›› 2018, Vol. 38 ›› Issue (2): 21-28.doi: 10.3969/j.issn.0253-2417.2018.02.003

• 研究报告 • 上一篇    下一篇

木质素-聚丙烯酸钠高吸水树脂的制备及性能

钱爽, 任浩   

  1. 南京林业大学 轻工与食品学院, 江苏 南京 210037
  • 收稿日期:2017-08-26 出版日期:2018-04-25 发布日期:2018-04-28
  • 通讯作者: 任浩,教授,主要从事生物质转化及利用的研究;E-mail:renhao@njfu.edu.cn。 E-mail:renhao@njfu.edu.cn
  • 作者简介:钱爽(1991-),女,浙江嵊州人,硕士生,主要从事生物质转化及利用的研究工作
  • 基金资助:
    国家重点研发计划项目(2017YFD0601005);南京林业大学杰出青年基金(NLJQ2015-005)

Process Conditions and Performance of Polyacrylate-based Super Absorbent Resin Prepared with Lignin-related Compounds

QIAN Shuang, REN Hao   

  1. College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Received:2017-08-26 Online:2018-04-25 Published:2018-04-28

摘要: 采用水溶液聚合法通过改变木质素种类合成木质素-聚丙烯酸钠吸水树脂,比较了不同树脂的形态特征、吸水及耐盐性能,并研究了不同木质素对合成树脂的微观孔隙结构和比表面积的影响,进一步采用动力学模型拟合树脂的溶胀行为。结果表明:碱木质素(AL)的少量(2.67%)添加对聚丙烯酸吸水树脂的吸水能力有显著提高,木质素邻苯三酚合成树脂(LP-g-PAA,2 137 g/g) > 木质素磺酸盐合成树脂(LS-g-PAA,1 348 g/g) > 木质素间苯二酚合成树脂(LR-g-PAA,1 344 g/g) > 木质素对甲酚合成树脂(LC-g-PAA,1 262 g/g) > 碱木质素合成树脂(AL-g-PAA,518 g/g) > 聚丙烯酸树脂(PAA,439 g/g)。添加不同种类木质素的合成树脂的溶胀行为均符合Schott二级溶胀动力学模型,R2值均大于0.98。LP-g-PAA的耐盐性能受离子价位、水合离子半径和离子浓度的影响,其耐盐性能强弱顺序如下:KCl > KNO3≈LiCl > K2SO4 > K2CO3 > CaCl2 > FeCl3。FE-SEM和BET分析表明:添加少量不同种类的木质素能够不同程度地改变合成树脂的孔隙结构和比表面积,从而影响其吸液性能。

关键词: 木质素, 聚丙烯酸, 吸水树脂, 孔隙结构

Abstract: Lignin including alkali lignin (AL), lignosulfonate (LS), lignocresol (LC), lignoresorcinol (LR) and lignopyrogallol (LP) were grafted by acrylic acid (AA) to synthesized water-absorbent resin under aqueous solution with potassium persulfate (KPS) as initiator and N,N'-methylene-bis-acrylamide (MBA) as crosslinking agent. The morphological characteristic water-absorbing capacity and salt tolerance of different resins were compared. The effects of different lignins on the pore structure and specific surface area were studied. The swelling behaviors of the resins were fitted by the swelling kinetics model. The results indicated that the water absorption capacities of resins were according to the order of lignopyrogallol grafted polyacrylic acid resin(LP-g-PAA, 2 137 g/g) >lignosulfonate grafted polyacrylic acid resin (LS-g-PAA, 1 348 g/g) > lignoresorcinol grafted polyacrylic acid resin (LR-g-PAA, 1 344 g/g)>lignocresol grafted polyacrylic acid resin (LC-g-PAA, 1 262 g/g) > Alkaline lignin grafted polyacrylic acid resin (AL-g-PAA, 518 g/g)>polyacrylic acid resin (PAA, 439 g/g). The FE-SEM and BET specific surface area analyses showed that the addition of different lignins could change the pore structure and specific surface area to different degree, shich would affect the absorption. And the swelling behaviors of the resins were proved to according with Schott swelling kinetics model(R2>0.98). Salt tolerance of LP-PAA resin were affected by the valence of ion,radius of hydrated ion and concentration of ion and the results were as follows:KCl>KNO3≈LiCl > K2SO4 > K2CO3 > CaCl2 > FeCl3.

Key words: lignin, polyacrylic acid, water-absorbent resin, pore structure

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