马铃薯废渣/聚丙烯酸/坡缕石黏土高吸水树脂的制备及表征

采用马铃薯废渣(PWR,粒径<180目)作为纤维素和淀粉源,过硫酸钾(KSB)为引发剂,N,N'-亚甲基双丙烯酰胺(MBA)为交联剂,复配坡缕石(PGS)黏土,与部分中和的丙烯酸(AA)通过自由基引发在水溶液中接枝共聚制备低成本PWR-g-PAA/PGS高吸水树脂。借助扫描电镜(SEM)、红外光谱(FTIR)及热重分析(TGA)对高吸水树脂的形貌、结构及热稳定性进行了表征和分析,并测试其吸液性能。结果表明,当坡缕石黏土和马铃薯废渣的用量占反应体系总质量的17.5%时,WPR-g-PAA/PGS高吸水树脂对w(NaCl)=0.9%水溶液、蒸馏水的最大吸收量分别为41.0、538.6 g/g,保水率为96.1%,凝胶强度达11.3 kPa。通过高吸水树脂的吸水溶胀过程确定了材料的吸水动力学行为符合non-Fickon扩散模型。

Preparation and Characterization of PWR-g-PAA/PGS Superabsorbent Resin

A low cost superabsorbent resin, PWR-g-PAA/PGS, based on the potato waste residue (PWR, particle size>180 mesh) as the source of cellulose and starch, was prepared by free radical graft copolymerization of partly-neutralized acrylic acid (AA) on the chain of PWR mixed with palygorskite (PGS) in aqueous solution. The copolymerization was carried out using N, N?methylene double acrylamide (MBA) as cross-linking agent and potassium persulfate (KSB) as initiator. The morphology, structure and thermal stability of the polymers were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Thermo-gravimetric analysis (TGA). The water-absorption capability of the polymers was also determined. The results showed that the superabsorbent resin bears the maximum absorption amount of 41.0 g/g for 0.9% NaCl solution, 136.0 g/g for tap water, 538.6 g/g for distilled water. Water retention rate was 96.1%, Gel strength was 11.3 kPa when the total adding amount of palygorskite and potato waste residue accounts for 17.5% in PWR-g-PAA/PGS. The swelling dynamics model of the resin was non-Fickon diffusion.