SUPERABSORBENT POLYMER HYDRO GELS AND A METHOD OF PREPARING THEREOF

摘要

The invention relates to a method for the preparation of a superabsorbent polymer hydrogel, comprising crosslinking a precursor comprising a carboxymethylcellulose salt optionally in combination with hydroxyethylcellulose, using citric acid as the crosslinking. agent and in the presence of a molecular spacer, subsequently washing the gel in a polar organic solvent and finally drying the gel by phase inversion in a non-solvent for cellulose. The invention further concerns the superabsorbent hydrogel obtainable by the method of the invention and the use thereof in a number of different applications.