Patent ID: 11931720
Assignee: LG CHEM, LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A method for preparing superabsorbent polymer comprising:
preparing a base resin in which acrylic acid-based monomers having acid groups, of which at least a part are neutralized, and an internal crosslinking agent are crosslinked;
mixing hydrophobic material having a HLB of 0 or more and 6 or less, and an epoxy-based surface crosslinking agent with the base resin to prepare a mixture; and
increasing a temperature of the mixture to conduct surface modification of the base resin,
wherein the hydrophobic material is mixed in a content of 0.02 to 0.5 parts by weight, based on 100 parts by weight of the base resin,
wherein the hydrophobic material includes one or more of glyceryl stearate, glycol stearate, glyceryl laurate, sorbitan stearate, sorbitan trioleate, or PEG-4 dilaurate, and
wherein during the mixing, the hydrophobic material is dry mixed with the base resin, and then, the epoxy-based surface crosslinking agent is dissolved in water and mixed in a state of a surface crosslinking solution.