Method for producing particulate water-absorbing agent composed principally of water-absorbing resin

摘要

Provided is a production method for the particulate water-absorbing agent, which can collecting the fine powders generated during the producing process efficiently without worsening working environment, and also the particulate water-absorbing agent produced by the production method thereof. This production method includes (1) a polymerization step for obtaining a polymer gel, (2) a drying step for drying said polymer gel to obtain a particulate water-absorbing resin, (3) a classification step for sieving said particulate water-absorbing resin, (4) a surface cross-linking step for cross-linking the neighborhood of the surface of said particulate water-absorbing resin (5) a packaging step for filling a packaging material container with said particulate water-absorbing agent for packaging and (6) a transportation step for transporting the products produced in each of the steps to the other steps. In this production method, the fine powders contained in gas composed principally of air, in any of the steps, can be collected by use of a trapping material.

主权项

1. A method for producing a particulate water-absorbing agent comprising:
a polymerization step for obtaining a polymer gel; a drying step for drying said polymer gel to obtain a particulate water-absorbing resin; a classification step for sieving said particulate water-absorbing resin; a surface cross-linking step for cross-linking the neighborhood of the surface of the particulate water-absorbing resin obtained in the classification step to obtain a particulate water-absorbing agent; a packaging step for filling a packaging material container with said particulate water-absorbing agent for packaging; and a transportation step for transporting the products produced in each of the steps to the other steps;wherein fine powders contained in gas composed principally of air, in any of the steps, are collected by use of a trapping material heated to a temperature at or higher than 60° C.; said trapping material, having a trapping efficiency equal to or higher than 90% for trapping Japanese Industry Standard (JIS) 12-type carbon black with a particle diameter of 0.03 μm to 0.2 μm and being a membrane filter composed of a membrane that captures the fine powders generated from any of the steps at the surface thereof and a substrate that supports the membrane, is provided in a fine powder capturing apparatus in at least one of the steps; and the fine powder capturing apparatus is only connected via a pipeline to, but is not placed within, any of the apparatuses for performing any of the steps.