Effect of surface crosslinking on absorption properties of superabsorbent polymers

Isocyanates,aldehydes and metal salts were applied as surface crosslinking agent for superabsorbent polymers prepared by solution polymerization of acrylic acid.The results showed that the superabsorbent polymers treated by formaldehyde possessed good properties,including high absorption speed,easy dispersion in aqueous solution,dry surface of the gel after absorption,pretty absorbency under pressure,and simple surface treating process.When 5g superabsorbent polymer was treated with 0.1g formaldehyde for 12h at room temperature,the superabsorbent polymer got the optimum performance.