Superabsorbent Polymer And Preparation Method Thereof
AssigneeLG Chem, Ltd.
InventorsYong Hun Lee, Tae Young Won, Jun Wye Lee, Kwangin Shin, Chang Hun Han
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Abstract
Provided are a superabsorbent polymer having a high bulk density value and showing a reduction in unpleasant odors which may be caused by various additives included in a preparation process while basically maintaining excellent absorption performance and absorption rate, and a preparation method thereof.
Claims16
A method of preparing a superabsorbent polymer, the method comprising:
- A) performing crosslinking polymerization of water-soluble ethylene-based unsaturated monomers having acidic groups which are at least partially neutralized, in the presence of an internal crosslinking agent, to form a water-containing gel polymer including a crosslinked polymer;
- B) drying, pulverizing, and size-sorting the water-containing gel polymer to form a base polymer powder;
- C) performing surface-crosslinking of the base polymer powder by heat treatment in the presence of a surface crosslinking agent to form superabsorbent polymer particles;
- D) adding an aggregation inhibitor and water to the superabsorbent polymer particles;
- and
- E) evaporating the water.
A superabsorbent polymer comprising a crosslinked polymer which is obtained by polymerizing water-soluble ethylene-based unsaturated monomers having acidic groups which are at least partially neutralized, in the presence of an internal crosslinking agent, wherein the crosslinked polymer includes a surface-crosslinked layer which is modified by a surface crosslinking agent;
- and having powder flowability of 10 g/s or more.
A superabsorbent polymer comprising a crosslinked polymer which is obtained by polymerizing water-soluble ethylene-based unsaturated monomers having acidic groups which are at least partially neutralized, in the presence of an internal crosslinking agent, wherein the crosslinked polymer includes a surface-crosslinked layer which is modified by a surface crosslinking agent;
- having bulk density of 0.55 g/ml or more;
- and releasing total volatile organic compounds of 2 ppm or less for 30 minutes at 100° C.
Dependencies are inferred from the claim text.