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|1. (WO2017155197) METHOD FOR PREPARING SUPERABSORBENT RESIN, AND SUPERABSORBENT RESIN|
|Applicants:||LG CHEM, LTD.
|Inventors:||YOON, Hyung Ki
NAM, Dae Woo
HAN, Chang Sun
SEO, Sung Jong
|Title:||METHOD FOR PREPARING SUPERABSORBENT RESIN, AND SUPERABSORBENT RESIN|
The present invention relates to a method for preparing a superabsorbent resin, which maintains excellent absorption performance and exhibits improved liquid permeability and absorption rate. The method for preparing a superabsorbent resin may comprise the steps of: performing cross-linking polymerization on a water-soluble ethylenically unsaturated monomer having an at least partially neutralized acidic group to form a hydrogel polymer comprising a cross-linked polymer, in the presence of an internal cross-linking agent; drying, pulverizing, and classifying the hydrogel polymer to form a base resin powder; and performing surface cross-linking on the base resin powder by using a surface cross-linking liquid containing a surface cross-linking agent of an alkylene carbonate having 2 to 5 carbon atoms, in the presence of hydrophobic silica particles having a contact angle of greater than 10° and smaller than or equal to 150° with respect to water and hydrophilic silica particles having a contact angle of smaller than or equal to 10° with respect to water.