| 主权项 |
1. A method for preparing a super absorbent polymer comprising the steps of:
1) 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; 2) mixing the hydrous gel phase polymer with a polycarboxylic acid-based copolymer having a repeating unit represented by the following Chemical Formulas 1-a and 1-b and pulverizing the polymer; 3) drying the pulverized polymer; 4) pulverizing the dried polymer; and 5) surf ace-crosslinking the pulverized polymer. in Chemical Formulas 1-a and 1-b, R1, R2 and R3 are each independently hydrogen, or an alkyl group having 1 to 6 carbon atoms, RO is an oxyalkylene group having 2 to 4 carbon atoms, M1 is hydrogen, or a monovalent metal or a non-metal ion, X is —COO—, an alkyloxy group having 1 to 5 carbon atoms, or an alkyldioxy group having 1 to 5 carbon atoms, m is an integer of 1 to 100, n is an integer of 1 to 1000, and p is an integer of 1 to 150, provided that when p is 2 or more, two or more repeated —RO— may be the same or different from each other. |
