Effect of Metal Ions on the Characteristics of Potassium-Polyacrylate-Polyacrylamide SAP Under Alternated Water-Absorbing and Salinity-Absorbing

It is the effective approach to enhance the characteristics of superabsorbent polymers(SAP)by copolymerization with polyacrylate and polyacrylamide monomer.In this paper,two potassium-polyacrylate-polyacrylamide SAPs were chose,and the effect of four metal ions on its characteristics under alternated water-absorbing and salinity-absorbing was studied.The results show that:the metal ions have strong restrain function to the SAPs,and the effect order of two SAPs on the water-absorbing ratio and max capability is deionized waterK+ Na+ Ca2+ Fe3+.The effect of K+ and Na+ on the characteristics of salinity-absorbing can be comeback,but the Ca2+ and Fe3+ cannot.The micro-morphology of potassium-polyacrylate-polyacrylamide SAP hydrogel isn't the classical 3-dimensional network structure,but all membranes in 3-dimensional gridding membrane structure.The four cations have different influences on the micro-morphology of hydrogel.