The present invention relates to a preparation method of a superabsorbent polymer, and specifically to a method of preparing a superabsorbent polymer including the steps of: preparing a hydrous gel phase polymer by thermal polymerizing or photo-polymerizing a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator; drying the hydrous gel phase polymer; milling the dried polymer; classifying the milled hydrous gel phase polymer into two or more grades by particle size; adding a surface cross-linking agent to each hydrous gel phase polymer classified into two or more grades; and carrying out a surface cross-linking reaction of the hydrous gel phase polymer to which the surface cross-linking agent is added.
申请公布号
WO2012074254(A3)
申请公布日期
2012.10.04
申请号
WO2011KR09118
申请日期
2011.11.28
申请人
LG CHEM, LTD.;WON, TAE-YOUNG;HAN, CHANG-SUN;KIM, GI-CHEUL;LEE, SANG-GI;KIM, KYU-PAL;PARK, SUNG-SOO;LEEM, GYU