High water absorbent polymer containing strong hydrophilic groups, insoluble in water, but can absorb tens of thousands of self weight, hundreds or even thousands of times the water polymer. The raw materials can be roughly divided into starch, cellulose and synthetic polymer systems.

In the production process, the chemical reactions involved in the polymerization of hydrophobic polymers and hydrophilic monomers, the methylation of hydrophobic polymers and crosslinking of water-soluble polymers.

For example, starch or cellulose was used as raw material, cerium salt was used as catalyst to graft copolymerization with acrylonitrile. Crosslinking polymerization of aqueous solution of sodium acrylate in hydrocarbon solvent. Or polyvinyl alcohol by cyclic anhydride (phthalic anhydride, two maleic anhydride two esterification and crosslinking etc.).

High water absorbent polymer water absorption rate is fast, swelling after the water gel state. Due to the absorption of water is mainly confined to the polymer network, so it is not easy to lose moisture after absorbing water, drying can restore the original water absorption capacity.