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US 10,065,175 B2Granted
Superabsorbent polymer having high absorption rate under load and preparation method thereof
AssigneeLG Chem, Ltd.
InventorsSang Gi Lee, Soo Jin Lee, Hye Mi Nam, Min Ho Hwang
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Abstract
Provided are a superabsorbent polymer and a preparation method thereof. In the superabsorbent polymer according to the present invention, a low-temperature foaming agent are used together with a high-temperature foaming agent to control the size and distribution of internal pores of the superabsorbent polymer, thereby increasing absorption rate under load without reduction in gel strength.
Claims7
A method of preparing a superabsorbent polymer comprising:
- 1) polymerizing or crosslinking a monomer composition comprising acrylic acid-based monomers having acidic groups which are at least partially neutralized, in the presence of a polymerization initiator, a first crosslinking agent, a low-temperature foaming agent, and a high-temperature foaming agent at 25 to 100° C. to form a water-containing gel polymer,
- 2) coarsely pulverizing the water-containing gel polymer,
- 3) drying the coarsely pulverized water-containing gel polymer at 150° C. to 250° C.,
- 4) pulverizing the dried polymer, and
- 5) surface-modifying the pulverized polymer by a second crosslinking agent,
- wherein a weight ratio of the low-temperature foaming agent and the high-temperature foaming agent is 50:1 to 2:1.
3 more elements
Dependencies are inferred from the claim text.