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US 2023/0390735 A1Published application
Preparation method of superabsorbent polymer
AssigneeLG Chem, Ltd.
InventorsSe Yeol PARK, Gicheul KIM, Yoon Jae MIN
Life of this patent
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Abstract
Provided is a method for preparing a superabsorbent polymer. More particularly, provided is a method for preparing a superabsorbent polymer having a reduced amount of coarse particles with a particle size of more than 850 μm and an improved water content, and exhibiting excellent absorption performances without deviation.
Claims19
A method for preparing a superabsorbent polymer, comprising:
- forming a water-containing gel polymer by a crosslinking-polymerization of a water-soluble ethylenically unsaturated monomer having acidic groups and an internal crosslinking agent,
- preparing water-containing superabsorbent polymer particles by performing micronization of the water-containing gel polymer,
- preparing dry superabsorbent polymer particles by drying the water-containing superabsorbent polymer particles,
- forming a surface-crosslinked layer on at least a part of a surface of superabsorbent polymer particles by adding a surface crosslinking agent to the dry superabsorbent polymer particles and reacting the surface crosslinking agent with the dry superabsorbent polymer particles, and
- cooling and hydrating the superabsorbent polymer particles, on which the surface-crosslinked layer is formed, using a spade-type cooler,
- wherein the spade-type cooler comprises a rotatable body part including a transfer space through which the superabsorbent polymer particles on which the surface-crosslinked layer is formed are transferred;
- two nozzles installed in the rotatable body part, each injecting cooling air and water into the transfer space;
- one or more spade-type blades which are installed on an inner wall of the rotatable body part to be operable up and down and to scoop up the superabsorbent polymer particles, on which the surface-crosslinked layer is formed, in the transfer space;
- and a driving motor which is connected to the rotatable body part and provides a driving force, wherein the cooling and hydrating of the superabsorbent polymer particles, on which the surface-crosslinked layer is formed, are performed by scooping up the superabsorbent polymer particles, on which the surface-crosslinked layer is formed, by the spade-type blades in the body part, and then dropping the scooped-up superabsorbent polymer particles in the gravity direction by rotation of the rotatable body part to be brought into contact with the cooling air and the water which are injected into the transfer space of the body part.
6 more elements
Dependencies are inferred from the claim text.