Patent ID: 8802800
Filing Date: 2014-08-12
Classification: C08J

Abstract:
1. 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.