Study on Synthesis and Performance of the Novel Salt-tolerant AA-g-AM Superabsorbent Polymer

A graft-copolymerization polymer AA-g-AM was prepared in water solution by using acrylate acid(AA) and acrylamide(AM) as monomers,N,N '-methylene-bis-acrylmide(NMBA) as crosslinker and potassium persulfate(KPS) as initiator.The effects of factors such as ratio of graft monomer,content of crosslinker and initiator,degree of neutralization and temperature on the absorbency of the graft-superabsorbent polymer were discussed.FTIR indicated that acrylic acid was grafted onacrylamide.The optimum reaction conditions were determined as follows : m(AA): m(AM) =7:10,dosage of crosslinker 0.04% and initiator 0.08%(based on mass of acrylic acid),degree of neutralization 0.53 and reaction temperature 60℃.The results showed that the absorbency of the resin was 400g/g for distilled water and 160g/g for normal saline.The water-absorption rate and water-retention and ability of the resin were significantly enhanced,and a high water-absorbent with good salt tolerance was observed.