Optimum Synthesis Conditions for Starch Grafting Acrylic Acid /Acrylamide Copolymer

A super absorbent resin was synthesized,using starch,acrylic acid and acrylamide as raw materials,(NH4)2Ce(NO3)6 as initiator and N,N-methylene-bis－acrylamide as cross-linking agent.Effects of bath temperature,reaction time,amount of cross-linking agent,amount of starch,amount of initiator,ratio of acrylamide/acrylic acid and neutralization degree of acrylic acid on water absorbency of resin were studied.Optimum synthesis conditions were:bath temperature 75 ℃,reaction time 15 h,mass ratio of acrylamide/acrylic acid 15/1,neutralization degree of acrylic acid 75%,amount of starch up to 20% and amount of cross-linking agent and initiator in total raw materials 005%,08%,respectively.Salt－water absorbency was up to 58 g／g in 5% NaCl solution and 38 g／g in 15% NaCl solution.