AMPS/AA Superabsorbent Resin Synthesized by Inverse Suspension Polymerization

Inverse suspension copolymerization of acrylate acid(AA)/acrylamidomethylpropane sulfonic acid(AMPS) is studied by using methylene bisacrylamide as the cross linking agent,potassium persulfate as the initiator and the span 60 as the stabilization agent.The optimum conditions from orthogonal experiment are as follows:nAMPS∶nAA=1.8∶1,neutralization degree of acrylate acid 70 %,wt(initiator)=0.1 %,wt(cross-linking agent)=0.05 %.Under the optimum conditions,the ability of absorbing water by the resin increases by 990 and that of absorbing NaCl(0.9 %) solution increases by 123g/g.