魔芋超强吸水剂一步法连续造粒制备

One-step continuous synthesis and granulation of konjac super absorbent

以魔芋葡甘聚糖(KGM)为骨架材料,丙烯酸钠为单体,经过硫酸钾引发,氧化铝初步交联和N,N-亚甲基双丙烯酰胺(MBA)二次交联,接枝共聚反应物通过压力挤出装置挤出,于聚乙二醇600中分散造粒,分散相中脱水干燥制得魔芋超强吸水剂颗粒(KSAP)。考察了聚合时间、氧化铝用量、MBA用量及二次交联时间、脱水干燥时间对其吸水倍率的影响。Box-Behnken条件优化实验结果表明,氧化铝0.245g、聚合80min、MBA0.08g、二次交联42min、70℃干燥40min,制得的魔芋超强吸水颗粒吸水倍率可达731g/g。

Superabsorbent polymer(SAP) was prepared through a novel one-step synthesization.The liquid polymer was squeezed from stress squeeze device and dispersed to granulation.In dispersed phase,granule was dehydration and continuous synthesis.SAP was prepared by grafting sodium acrylate on to konjac glucomannan with potassium peroxydisulfate(K2S2O8),alumina(Al2O3),N,N-methylene bis-acrylamid(MBA) and polyethyleneglycol-600(PEG-600) as initiator,first step crosslinker,second step crosslinker and dispersed phase respectively.The effect of various experimental conditions on the water absorbency was investigated.The results of Box-Behnken experiment design showed that the granule is capable of absorbing pure water 731g/g when the amount of alumina is 0.245g,the polymerization time is 80min,the amount of MBA is 0.08g,the second crosslink time is 42min,and the drying time is 40min at 70℃.