Method of manufacturing water-absorbent resin composition

Patent metadata

Field	Value
Publication number	US-9878304-B2
Application number	US-201414780293-A
Country	US
Kind code	B2
Filing date	Jan 30, 2014
Priority date	Mar 27, 2013
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

The invention provides a method of manufacturing a water-absorbent resin composition containing water-absorbent resin particles and additive particles, by which it is possible to obtain a water-absorbent resin composition that sufficiently exhibits additional functions, such as an anti-blocking property under moisture absorption, of the additive particles while maintaining an excellent water absorption property. A method of manufacturing a water-absorbent resin composition includes a resin particle preparation step and a mixing step. In the mixing step, water-absorbent resin particles which are prepared in the resin particle preparation step are mixed with additive particles in multiple stages by using a plurality of mixing apparatuses to obtain a water-absorbent resin composition.

First claim

The invention claimed is:

1. A method of manufacturing a water-absorbent resin composition containing water-absorbent resin particles and additive particles, the method comprising:
a resin particle preparation step of preparing the water-absorbent resin particles; and
a mixing step of mixing the water-absorbent resin particles which are prepared in the resin particle preparation step, with additive particles in multiple stages by using a plurality of mixing apparatuses and obtaining a water-absorbent resin composition,
wherein the mixing step includes:
a primary mixing stage of carrying out primary mixing of the water-absorbent resin particles with the additive particles by using a first mixing apparatus;
a first transport mixing stage of vapor-phase transporting the primary mixture, which is obtained in the primary mixing stage, from the first mixing apparatus to a second mixing apparatus through a first transport pipe disposed between the first mixing apparatus and the second mixing apparatus, while mixing the primary mixture in the first transport pipe;
a secondary mixing stage of carrying out secondary mixing of a mixture which is obtained in the first transport mixing stage, by using the second mixing apparatus until the additive particles are uniformly dispersed; and
a second transport mixing stage of vapor-phase transporting a secondary mixture, which is obtained in the secondary mixing stage, from the second mixing apparatus through a second transport pipe which discharges the secondary mixture from the second mixing apparatus, while mixing the secondary mixture in the second transport pipe.

2. The method of manufacturing a water-absorbent resin composition according to claim 1 ,
wherein the primary mixing stage includes a plurality of mixing stages.

3. The method of manufacturing a water-absorbent resin composition according to claim 1 ,
wherein the first mixing apparatus and the second mixing apparatus are based on different mixing schemes from each other.

4. The method of manufacturing a water-absorbent resin composition according to claim 1 ,
wherein the additive particles are formed of an inorganic substance.

5. The method of manufacturing a water-absorbent resin composition according to claim 2 ,
wherein in the primary mixing stage, a processing amount of the water-absorbent resin particles in one primary mixing processing is greater than 0 kg and equal to or less than 40000 kg.

Assignees

• Sumitomo Seika Chemicals

Inventors

• Kotake Masato
• Masumoto Hironobu
• Kuzukawa Masahiro

Classifications

• C08L33/06

  of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical · CPC title

• B01J20/30

  Processes for preparing, regenerating, or reactivating · CPC title

• B01J20/261 Primary

  obtained by reactions only involving carbon to carbon unsaturated bonds (macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds per se C08F) · CPC title

• B01J2220/46

  Materials comprising a mixture of inorganic and organic materials (materials coated or impregnated on a carrier B01J20/32) · CPC title

• B01J20/3042

  Use of binding agents; addition of materials ameliorating the mechanical properties of the produced sorbent · CPC title