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1. (WO2017155197) METHOD FOR PREPARING SUPERABSORBENT RESIN, AND SUPERABSORBENT RESIN

Pub. No.:    WO/2017/155197    International Application No.:    PCT/KR2017/000057
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Wed Jan 04 00:59:59 CET 2017
IPC: C08J 3/24
C08J 3/12
C08J 3/075
C08F 2/44
C08F 6/28
C08K 7/26
C08K 3/34
C08F 20/06
C08L 33/02
Applicants: LG CHEM, LTD.
주식회사 엘지화학
Inventors: YOON, Hyung Ki
윤형기
NAM, Dae Woo
남대우
LEE, Hyemin
이혜민
HAN, Chang Sun
한장선
SEO, Sung Jong
서성종
Title: METHOD FOR PREPARING SUPERABSORBENT RESIN, AND SUPERABSORBENT RESIN
Abstract:
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.