Method For Preparing Superabsorbent Polymer, And Superabsorbent Polymer Prepared Thereby
AssigneeLG Chem, Ltd.
InventorsHye Mi Nam, Min Ho Hwang, Sang Gi Lee, Tae Hwan Jang, Soo Jin Lee
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Abstract
The present invention relates to a method for preparing a superabsorbent polymer, and a superabsorbent polymer prepared thereby. A superabsorbent polymer prepared by the preparation method exhibits minimized deterioration of physical properties after being pulverized, and thus basic absorbance performance is excellent and an excellent liquid permeability and absorbance rate can be exhibited.
Claims8
A superabsorbent polymer comprising a base polymer powder including a crosslinking polymer of water-soluble ethylene-based unsaturated monomers having acidic groups which are at least partially neutralized;
- and a surface-crosslinked layer formed on the base polymer powder, wherein a GBP reduction rate of the following Equation 1 is −55% to 0%:
- GBP reduction rate (%)={(G1−G0)/G0}*100 [Equation 1]
- wherein G0 is an initial gel bed permeability of the superabsorbent polymer, and
- G1 is a gel bed permeability of the superabsorbent polymer having a particle size of 300 μm to 600 μm, which is obtained by pulverizing the superabsorbent polymer using a ball mill under 300 rpm for 20 minutes and then size-sorting the pulverized superabsorbent polymer.
Dependencies are inferred from the claim text.