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US 10,857,044 B2Granted
Method for preparing superabsorbent polymer
AssigneeLG Chem, Ltd.
InventorsMin Ho Hwang, Sang Gi Lee, Hye Mi Nam, Soo Jin Lee, Tae Hwan Jang
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Abstract
The present invention relates to a method for a superabsorbent polymer. The preparation method controls the time from the addition of a foaming agent to the initiation of a polymerization reaction, thereby forming an appropriate pore structure in a superabsorbent polymer. The superabsorbent polymer produced through the preparation method can exhibit a remarkably improved absorption rate while exhibiting excellent absorption performance.
Claims8
A method for preparing a superabsorbent polymer comprising:
- irradiating light within 9 seconds from the moment when a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups makes contact with a foaming agent, and performing crosslinking polymerization via light irradiation of a monomer mixture containing the water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups, and the foaming agent, in the presence of an internal crosslinking agent to prepare a hydrogel polymer;
- drying, pulverizing, and classifying the hydrogel polymer to form a base polymer powder;
- and
- additionally crosslinking a surface of the base polymer powder in the presence of a surface crosslinking agent to form a surface-crosslinked layer,
- wherein the superabsorbent polymer has a centrifuge retention capacity (CRC) for a physiological saline solution of 29 to 33 g/g and absorbency under load (AUL) of under 0.9 psi for a physiological saline solution of 14 to 22 g/g, and a vortex time of 20 to 40 seconds.
2 more elements
Dependencies are inferred from the claim text.