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US 2022/0016599 A1Published application
Preparation Method of Super Absorbent Polymer and Super Absorbent Polymer Prepared Therefrom
AssigneeLG Chem, Ltd.
InventorsSang Gi Lee, Mookon Kim, Yong Hun Lee, Hyemi Nam, Jiyoon Jeong, Chang Hun Lee
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Abstract
The present disclosure relates to a method for preparing a super absorbent polymer that enables the preparation of a more improved super absorbent polymer even without excessive use of a surfactant and use of a foaming agent, and a super absorbent polymer prepared therefrom which exhibits a superior absorption rate.
Claims12
A method for preparing a super absorbent polymer comprising:
- performing crosslinking polymerization of a monomer mixture including a water-soluble ethylenically unsaturated monomer having an acidic group of which at least a part is neutralized, an anionic surfactant having an HLB value of 20 to 40 and an internal crosslinking agent to form a hydrogel polymer;
- drying, pulverizing and classifying the hydrogel polymer to form a base polymer powder;
- and
- further cross-linking the surface of the base polymer powder in the presence of a surface crosslinking agent to form a surface cross-linked layer,
- wherein the anionic surfactant is used at a concentration of 50 to 200 ppmw in the monomer mixture, and
- wherein the monomer mixture is formed by a method comprising mixing a solution containing the anionic surfactant with a mixture containing the monomer and the internal crosslinking agent while passing the solution through a tubular flow channel having a plurality of projecting pins therein at a space velocity of 50 to 1500 (min−1).
3 more elements
A super absorbent polymer comprising:
- a base polymer powder including a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having an acidic group of which at least a part is neutralized;
- and
- a surface crosslinked layer formed on the base polymer powder in which the first cross-linked polymer is further crosslinked via a surface crosslinking agent,
- wherein the super absorbent polymer has an absorption rate (vortex time) measured by a vortex test method of 5 to 35 seconds, a surface tension of 65 to 72 mN/m, and a bulk density of 0.50 to 0.65 g/ml.
1 more element
Dependencies are inferred from the claim text.