Synthesis and Water Absorption Properties of Konjac Superabsorbent

Potassium persulfate as initiator,N,N'-methylene-bis-acrylamide as crosslinker by means of radical polymerization in aqueous solution,konjac powder-acrylic acid(sodium)-acrylamide superabsorbent was synthesized.With the uniform design method,Konjac flour-AA-AM was synthesized.The results showed that the optimal conditions for the total amount of monomer(monomer/konjac flour) was 8.79 g·g-1,initiator(initiator/konjac flour) was 4.50%,reaction temperature was 66.7 ℃,amount of crosslinking agent(crosslinking agent/konjac flour) was 1.42%,reaction time was 2.55 h,the degree of acrylic acid was 81.74%,and monomer ratio was 51.7%.Under these conditions,water absorption of konjac powder-acrylic acid(sodium)-acrylamide graft copolymer was 751.3 g·g-1 and salt absorption was 128.6 g·g-1.