Synthesis of superabsorbent polymer in inverse emulsion via post-cross-linking
Firstly a graft copolymer was synthesized by graft copolymerization of starch with acrylamide (AM) in inverse emulsion,and then the copolymer was deaminated and post-cross-linked by heating to produce three-dimensional superabsorbent polymer.The effect of initiate conditions,composition and concentration of emulsifier,cross-linking methods and conditions were investigated.The results show that the optimized conditions are as follows:The mixture of (NH4)2S2Os-(NH2)2CO are used as initiators,and molar ratio of initiators and acrylamide is 1.4∶105; The mixture of Span20 and Tween80 with the mass ratio of mSpan20∶mTween80=80∶20 is used as emulsifier,and the total mass fraction of the mixed emulsifier is 7% of the oil phase; Post-cross-linking method is used,and the conditions are Tc=130 ℃-140 ℃,t=30 min.The water-absorbing capacity of superabsorbent polymer obtained under such conditions can reach up to 1300-1400 g/g in distilled water and 400-500 g/g in saline,respectively.Its water retention rate can reach more than 90%.
Post-cross-linking Deamination Superabsorbent Starch Graft copolymerization
Yafeng Cao Kai Liu Zhaoli Liu Fengzhi Tan Yuan Li
School of Chemical and Material, Dalian Polytechnic University, Dalian 116034, P.R.China
国际会议
厦门
英文
443-448
2012-01-04（万方平台首次上网日期，不代表论文的发表时间）