| abstract |
A method is provided for preparing a super absorbent polymer capable of exhibiting an excellent absorption rate by including a uniform porous structure through a simple and economical process. The method includes: performing a crosslinking polymerization of a water-soluble ethylenically unsaturated monomer to form a hydrogel polymer; drying and pulverizing the hydrogel polymer; classifying the pulverized polymer into polymer particles having a particle size of at least 10 to 150 μm, polymer particles having a particle size of 150 to 200 μm, and polymer particles having a particle size of 200 to 850 μm to form a base polymer powder having a particle size of 150 to 850 μm; and surface-crosslinking the base polymer powder, wherein in the crosslinking polymerization step, the foaming polymerization proceeds in the presence of polymer particles having an average particle size of 10 to 200 μm obtained in the classifying step and an anionic surfactant. |