Production method for water-absorbent resin
AssigneeNippon Shokubai Co., Ltd.
InventorsShinichi Fujino, Kozo Nogi, Kunihiko Ishizaki
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Abstract
A production method for a water-absorbent resin, comprising a polymerization step for obtaining hydrogel by subjecting a monomer aqueous solution to a polymerization reaction, and a drying step for drying the hydrogel, wherein drying in the drying step is performed using a continuous through-flow belt-type drying machine, the pore opening rate of the through-flow belt in the continuous through-flow belt-type drying machine is 20 to 50%, the solid content of the hydrogel supplied to the drying step is 35% by weight or more, and the area occupancy rate of the hydrogel is 85 to 100% relative to the through-flow belt.
Claims22
A production method for a water-absorbent resin, comprising a polymerization step for obtaining a hydrogel by subjecting an aqueous monomer solution to a polymerization reaction, and a drying step for drying the hydrogel, wherein drying in the drying step is performed using a continuous through-flow belt-type drying machine, the pore opening rate of the through-flow belt in the continuous through-flow belt-type drying machine is 25 to 40%, solid content of the hydrogel supplied to the drying step is 35% by weight or more, the hydrogel is loaded on the through-flow belt of the continuous through-flow belt-type drying machine by using a traverse feeder or an oscillating feeder operated at a non-constant peripheral speed, the area occupancy rate of the hydrogel is 87 to 99% relative to the through-flow belt, and the hot air in the continuous through-flow belt-type drying machine is directed both up-flow and down-flow.
A production method for a water-absorbent resin, comprising a polymerization step for obtaining a hydrogel by subjecting an aqueous monomer solution to a polymerization reaction, and a drying step for drying the hydrogel, wherein drying in the drying step is performed using a continuous through-flow belt-type drying machine, pore opening rate of the through-flow belt in the continuous through-flow belt-type drying machine is 25 to 40%, solid content of the hydrogel supplied to the drying step is 35% by weight or more, the hydrogel is loaded on the through-flow belt of the continuous through-flow belt-type drying machine by using a traverse feeder or an oscillating feeder operated at a non-constant peripheral speed, the width occupancy rate of the hydrogel is 87 to 99% relative to the through-flow belt, and the hot air in the continuous through-flow belt-type drying machine is directed both up-flow and down-flow.
Dependencies are inferred from the claim text.