Synthesis of Superabsorbent Resin from Carboxymethyl Cellulose and Acrylic Acid by Graft Copolymerization

The superabsorbent resin was synthesized from carboxymethyl cellulose and acrylic acid by aqueous solution polymerization.The optimal synthetic conditions were found as follows: acrylic acid 18 g,carboxymethyl cellulose 2 g,NaOH 7.2 g,deionized water 50 g,K2S2O8 0.5 g,N,N’-methylene bisacrylamide solution(1 g/L) 3 mL,polymerization temperature 60℃,time 1.5 h,and vacuum drying temperature 60℃.This resin could absorb 474.2 times its own mass in deionized water.The absorbencies of this superabsorbent in deionized water,tap water,artificial urine,artificial blood and normal saline were examined respectively.The water-absorbing rate,water-keeping function and reproducibility of the resin were also tested.