Study on rapid synthesis of starch-graft-acrylic acid SAP

Using potassium persulfate and N,N′-methylene-bis-acrylamide(MBA) as initiator and cross-linker agent respectively,a solid SAP was in one step prepared by graft polymerization of acrylic acid and starch as the raw materials.The effects of the amount of cross-linker and initiator,neutralization of acrylic acid,the weight ratio of starch to acrylic acid,physical state and copolymerization temperature on water absorbency(WA) were studied.When the amount of starch-to-acrylic acid is 26%,MBA is 0.06%,initiator is 0.08,and neutralization degree is 48%,this SAP is capable of absorbing distilled water up to 1 300 mL/g and has excellent performance of water retention as well under the optimal condition.