Synthesis of Super Water Absorbent by Graft Copolymerizing Starch and Sodium Acrylate

Under the action of ammonium persulfate as the initiator, the pasting starch forms starch free radical. The graft polymerization occurs between starch free radical and sodium acrylate,from which the super water absorbent is prepared.Through experiments we discuss the influences on the properties of the super water absorbent by amount of initiator,the ratio of monomer and starch etc. When the amount of initiator is 1.5%,and starch/monomer is one over six ,this super water absorbent is capable of absorbing distilled water up to 550 times,water 250 times and 0.9% salt water 80-100 times in its saturated state at ambient temperature.It has also excellent performance of water retenting.