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Method of increasing the size and/or absorption under load of superabsorbent polymers by surface cross-linking and subsequent agglomeration of undersized particcles
Method of increasing the size and/or absorption under load of superabsorbent polymers by surface cross-linking and subsequent agglomeration of undersized particcles
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机译:通过表面交联和随后超细颗粒的团聚来增加超吸收性聚合物的尺寸和/或在负载下吸收的方法
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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° C.-150° C. to dry the polymer particles to form an acrylic SAP polymer having enhanced fluid absorption under load and, upon pulverizing, increased particle size.
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