Studying on preparation of super water absorbing materials by radiation modification techniques using bentonite and water soluble monomer

Research on preparing water super absorbent materials using Di Linh bentonite and water soluble acrylic monomer has been carried out by gamma radiation grafting and crosslinking techniques. The research results showed that gel formed depends on the absorbed dose and the concentration of bentonite used, and not affected by the cleanliness of them. In the dose range studied, water swelling content reached 579 g.g-1 with swelling rate of 20 g.g-1.min-1, in salting solution water absorption capacity decreased very much in particular at high concentrations. In salting media, the water absorption capacity of studied product depends on the type of salt in order as follows NaCl<FeSO4<Cu(NO3)2< SC(NH2)2. Absorption capacity of the polymer also depends on pH, particle size and drying temperature. The effect of water retention in sandy soil, the spectral characteristics XRD, FT-IR were also studied. (author)