Synthesis and Characterization of LS-g-P AMPS/ST Salt-tolerant Superabsorbent Resin

Novel lignosulfonate sodium-g-2-acrylamido-2-methylpropanesulfonicacid and sepiolite(LS-g-PAMPS/ST) salt-tolerant superabsorbent resin was synthesized by aqueous solution polymerization using microwave irradiation in the presence of potassium persulfate(KPS) as a initiator and N, N-methylene-bis-acrylamide(NMBA) as a crosslinking agent. The effects of the amount of sepiolite, lignosulfonate sodium, crosslinker, initiator and neutralization degree on the water absorbency of superabsorbent resin in 0.9% Na Cl salt solution were investigated. The water absorbency rate of LS-g-PAMPS/ST superabsorbent resin was studied.The chemical microstructure of LS-g-PAMPS/ST superabsorbent resin was determined by FTIR.The results showed that the optimal LS-g-PAMPS/ST superabsorbent resin possesses the water absorbency of 132g/g and has the strong salt resistance.The introduction of sepiolite into simultaneously the polymeric network can improve the saline water absorbency, and saline swelling rate of superabsorbent resin.