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filingDate 2016-06-13-04:00^^<http://www.w3.org/2001/XMLSchema#date>
grantDate 2021-04-13-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationDate 2021-04-13-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber CN-107922636-B
titleOfInvention Process for making superabsorbent polymers
abstract Provided is a method of producing a superabsorbent polymer that exhibits more improved liquid permeability and absorption rate while maintaining excellent absorption properties. The method for preparing a superabsorbent polymer may include the steps of: performing cross-linking polymerization of a water-soluble ethylenically unsaturated monomer having an at least partially neutralized acidic group in the presence of an internal cross-linking agent to forming an aqueous gel polymer comprising a cross-linked polymer; drying, pulverizing and size sorting the aqueous gel polymer to form a base polymer powder; using the surface in the presence of the first alumina particles The crosslinking solution performs surface crosslinking of the base polymer powder; and adding second alumina particles to the surface crosslinked base polymer powder, and then mixing them with each other.
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