Abstract: Using sodium bisulfite and ammonium persulfate,N,N-methylene bisacrylamide as redox initiator and crosslinking agent respectively,a water superabsorbent capable of absorbing more than 1 800 g/g deionized water and possessing good gel strength was prepared by synthesizing grafted starch acrylic acid acrylamide in the clay suspension for the first time.More than 1 000 g deionized water has been absorbed by the superabsorbent in 5 min,and water absorbence of this superabsorbent decreased slowly with the increase of temperature.Influences of kinds of clay,configuration of starch and amounts of clay and crosslinking agent on the properties of the resin are also discussed.

Key words: superabsorbents, starch, clay, graft polymerization