Preparation of a Superabsorbent Resistant to Saline Solution by Copolymerization of Acrylate with Acrylamide

A superabsorbent resistant to saline solution was prepared from copolymer of sodium acry late with acrylamide with ammonium persulfate and sodium sulfite as initiator, N,N' -methylene-bis-acylamide as crosslinking agent, by means of water solution copolymerization. The influence of mole ratio of acrylamide (AM) to acrylic acid (AA) , degree of neutralization of AA, the amount of crosslinking agent and initiator, and reaction temperature on water aborsorbency ( WA ) was investigated and optimized. Water absorbency of the superabsorbent in wNaCl=0.009 aqueous solution at atmosphere and applied pressure (1. 96 x 103 Pa) was about 50 and 18 g · g-1, respectively. Moreover, it also had excellent hydrogel strength.