Method for preparing superabsorbent polymer, and superabsorbent polymer

A method for preparing a superabsorbent polymer comprising:

• mixing water-soluble ethylenically unsaturated monomers having acid groups of which at least a part are neutralized, an internal crosslinking agent, a polymerization initiator, and additives to prepare a monomer composition, wherein the additives comprise plate and rod-shaped clay that is modified by an amine-based organic compound and has an amine group introduced on a surface thereof;
• polymerizing the monomer composition to form a hydrogel polymer comprising a multi-crosslinked polymer;
• and
• drying, grinding, and sieving the hydrogel polymer to form a base polymer powder,
• wherein a content of the additive is 0.03 to 5-0.05 parts by weight based on 100 parts by weight of the water-soluble ethylenically unsaturated monomers,
• wherein a content of the amine-based organic compound is 5 to 28 parts by weight, based on 100 parts by weight of the clay before being modified,
• wherein the superabsorbent polymer has absorbency under pressure (AUP) measured according to method of EDANA WSP 242.2 of 22 to 30 g/g and centrifuge retention capacity (CRC) to a saline solution (0.9 wt % sodium chloride aqueous solution) for 30 minutes of 35 to 40 g/g.