Synthesis of AA/AM/AMPS salt-tolerant superabsorbent resin with inverse suspension ploymerization

In order to improve the absorption capability of superabsorbent resin,the superabsorbent resin was synthetized through introducing 2-acrylamido-2-methyl propane sulfonic acid(AMPS) into the binary system of acrylic acid(AA) and acrylamide(AM) as third polymerization monomer with inverse suspension polymerization.With the orthogonal tests,the effect of monomer ratio,neutralization degree of AA as well as dosage of both crosslinker and initiator on the properties of products were investigated.The results of both infrared(IR) spectrum and scanning electron microscope(SEM) analysis show that the experimental product is AA/AM/AMPS terpolymer,and the obtained particles are spherical with crenulate surface.The optimum experimental condition is that the monomer molar ratio is 1.25(AA)∶ 1(AM)∶ 0.7(AMPS),the neutralization degree of AA is 90%,the dosage of crosslinker is 0.08%,and the dosage of initiator is 0.7%.Under the optimum condition,the absorption rate of product in distilled water and NaCl solution can reach 1 720 mL/g and 165 mL/g,respectively.