Method for preparing super absorbent polymer

A method for preparing a super absorbent polymer, comprising the steps of:

• step 1:
• preparing a monomer composition containing an acrylic acid-based monomer having at least partially neutralized acidic groups and an internal cross-linking agent;
• step 2:
• preparing a hydrogel polymer by cross-linking polymerization of the monomer composition in the presence of an aqueous dispersion of hydrophobic particles and a carbonate-based foaming agent;
• step 3:
• forming a powder-type base resin by drying and pulverizing the hydrogel polymer;
• and
• step 4:
• forming a surface cross-linked layer by further cross-linking the surface of the powder-type base resin in the presence of a surface cross-linking agent,
• wherein the aqueous dispersion of hydrophobic particles is a colloidal solution in which hydrophobic particles are dispersed by a surfactant, and
• the hydrophobic particles contain a metal salt of a C7 to C24 fatty acid, and have an average particle diameter of 1 μm to 100 μm.