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US 12,655,257 B2Granted
Preparation method of super absorbent polymer
AssigneeLG Chem, Ltd.
InventorJunwye Lee
Life of this patent
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Abstract
The present disclosure relates to a preparation method of a super absorbent polymer. More specifically, it relates to a preparation method of a super absorbent polymer, which can improve a drying efficiency in the preparation process and realize excellent absorption-related properties of the prepared super absorbent polymer by using a specific inorganic material in the reassembly process.
Claims10
A preparation method of a super absorbent polymer, comprising:
- cross-linking polymerizing a water-soluble ethylene-based unsaturated monomer having at least partially neutralized acidic groups in the presence of a polymerization initiator and an internal cross-linking agent to form a hydrogel polymer;
- pulverizing the hydrogel polymer to form hydrogel particles;
- drying, pulverizing, and classifying the hydrogel particles to separate them into a base resin normal powder and a base resin fine powder;
- cross-linking a surface of the base resin powder in the presence of a surface cross-linking agent to form super absorbent polymer particles;
- and
- classifying the super absorbent polymer particles into a super absorbent polymer normal powder and a super absorbent polymer fine powder;
- wherein the base resin fine powder and the super absorbent polymer fine powder are mixed with an aqueous dispersion of a water-insoluble inorganic salt to prepare a fine reassembly, and the fine reassembly is reintroduced during the pulverization of the hydrogel.
4 more elements
Dependencies are inferred from the claim text.