Method for producing water-absorbent resin
First Claim
1. A method for producing a water-absorbent resin comprising mixing a monomer composition, which contains at least a monomer and a pyrolytic polymerization initiator, with an organic solvent,wherein a temperature of the organic solvent is not lower than 70°
- C. at time of mixing,wherein, a mass per unit time of the monomer in the monomer composition that is mixed with the organic solvent per unit time is expressed as an amount per unit volume of the organic solvent, a lower limit is 0.02 g/ml/min and an upper limit is 0.2 g/ml/min, andwherein a flow rate of a reaction composition within a reaction portion of a reaction device is 0.01 to 1.0 m/s, wherein said reaction composition is obtained by supplying said monomer composition to said organic solvent that is stored in said reaction portion of said reaction device.
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Abstract
[Object] To provide a method for stably producing a water-absorbent resin in powder form or particle form, which has excellent physical properties such as water absorption performance and the like, without any production trouble.
[Solution] A method for producing a water-absorbent resin includes mixing a monomer composition, which contains at least a monomer and a pyrolytic polymerization initiator, with an organic solvent, a temperature of the organic solvent is not lower than 70° C. at time of mixing, and when a mass per unit time of the monomer in the monomer composition to be mixed with the organic solvent is expressed as an amount per unit volume of the organic solvent, a lower limit is 0.01 g/ml/min, and an upper limit is 0.2 g/ml/min.
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Citations
6 Claims
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1. A method for producing a water-absorbent resin comprising mixing a monomer composition, which contains at least a monomer and a pyrolytic polymerization initiator, with an organic solvent,
wherein a temperature of the organic solvent is not lower than 70° - C. at time of mixing,
wherein, a mass per unit time of the monomer in the monomer composition that is mixed with the organic solvent per unit time is expressed as an amount per unit volume of the organic solvent, a lower limit is 0.02 g/ml/min and an upper limit is 0.2 g/ml/min, and wherein a flow rate of a reaction composition within a reaction portion of a reaction device is 0.01 to 1.0 m/s, wherein said reaction composition is obtained by supplying said monomer composition to said organic solvent that is stored in said reaction portion of said reaction device. - View Dependent Claims (2, 3, 4, 5, 6)
- C. at time of mixing,
Specification