Procedure for increasing the size and/or absorption under the load of super absorbent polymers by surface networking and subsequent agglomeration of particles under normal size

摘要

A method of enhancing the water or aqueous fluid absorption of and/or increasing the particle size of fine water-absorbent polyacrylic SAP polymer particles includes surface-contacting the SAP polymer particles with a solution containing a cross-linking agent for the polyacrylic SAP polymer, and then subjecting the particles to conditions sufficient to further cross-link the surfaces of the SAP polymer particles. The surface cross-linked particles are then impregnated with water in a weight ratio of SAP polymer, dry basis, to water in the range of about 1:1 to about 1:10 to form a paste, and the paste is subjected to conditions, such as increased temperature, e.g., 50 DEG C - 150 DEG C to dry the polymer particles to form an acrylic SAP polymer having enhanced fluid absorption under load and, upon pulverizing, increased particle size.