Production method for water-absorbing resin
AssigneeNippon Shokubai Co., Ltd.
InventorsKozo Nogi, Kunihiko Ishizaki, Koji Matsumoto
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Abstract
In obtaining a water-absorbing resin with high property in high productivity, produced a production method for a water-absorbing resin in high property and stably. Provided is a production method for a water-absorbing resin, comprising: a step for polymerizing an acrylic acid aqueous solution; a step for drying the resultant water-containing gel; a step for pulverizing and classifying the dried substance; and a step for surface cross-linking after classification, wherein a hopper having an inclination angle of a cone part of equal to or larger than 45 degree, and a drawing rate of 30 to 80% is used.
Claims21
A production method for a water-absorbing resin, comprising:
- polymerizing an acrylic acid aqueous solution to obtain a water-containing gel;
- drying the water-containing gel to obtain a dried substance;
- pulverizing and classifying the dried substance to obtain a powder substance;
- and
- surface cross-linking of the powder substance,
- wherein including and subsequent to the drying step, after storing the dried substance or the powder substance in a hopper having an inclination angle of a cone part of 65-85 degree, and a drawing rate of 30 to 80%, at least one or more places, the dried substance or the powder substance is discharged.
Dependencies are inferred from the claim text.