Water-absorbing hydrogel and method for producing the same
AssigneeNissan Chemical Corporation
InventorYoshihiro Kudo
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Abstract
A hydrogel that exhibits excellent water absorbency even when dried, and has flexibility, shape stability, and shape retention properties, and a method for producing the hydrogel. A hydrogel comprising a water-soluble organic polymer, a silicate, a dispersant for the silicate, and a water-absorbing polymer. A method for producing a hydrogel including a formation step of forming a hydrogel comprising a water-soluble organic polymer, a silicate, a dispersant for the silicate, a water-absorbing polymer, and at least one solvent selected from the group having water and a water-soluble organic solvent, and as an optical step, a solvent removal step of removing a portion of the solvent in the hydrogel.
Claims7
A method for producing a sheet-shaped gel comprising:
- a formation step of forming a sheet-shaped gel comprising a water-soluble organic polymer (A), a silicate (B), a dispersant (C) for the silicate, a water-absorbing polymer (D), wherein the water-absorbing polymer (D) is at least one selected from the group consisting of a crosslinked polyacrylate and a crosslinked polyvinyl sulfonate, and a content of the water-absorbing polymer (D) in the sheet-shaped gel is 0.01 to 20% by mass, relative to 100% by mass of the sheet-shaped gel, a reinforcing material (E), wherein the reinforcing material (E) is a fiber, and a content of the fiber in the sheet-shaped gel is 0.5 to 10% by mass, relative to 100% by mass of the sheet-shaped gel, and a solvent (F) consisting of water, wherein a content of the solvent in the sheet-shaped gel is 70-95% by mass, relative to 100% by mass of the sheet-shaped gel;
- and
- performing a solvent removal step of removing a portion or all of the solvent in the sheet-shaped gel to adjust the content of the solvent in the sheet-shaped gel to less than 50% by mass.
A sheet-shaped hydrogel comprising
- a water-absorbing hydrogel comprising
- a water-soluble organic polymer (A),
- a silicate (B),
- a dispersant (C) for the silicate,
- a water-absorbing polymer (D), wherein the water-absorbing polymer (D) is at least one selected from the group consisting of a crosslinked polyacrylate and a crosslinked polyvinyl sulfonate, and a content of the water-absorbing polymer (D) in the hydrogel is 0.01 to 20% by mass, relative to 100% by mass of the hydrogel, and
- a reinforcing material (E), wherein the reinforcing material (E) is a fiber, and a content of the fiber in the hydrogel is 0.5 to 10% by mass, relative to 100% by mass of the hydrogel, and
- a solvent (F) consisting of water, wherein a content of the solvent in the hydrogel is 70-95% by mass, relative to 100% by mass of the hydrogel.
Dependencies are inferred from the claim text.