Process for production of water-absorbing material

Details Process for production of water-absorbing material Process for production of water-absorbing material

2004-06-02

2008-09-30

Miller, Bena (Department: 3725)

Solid material comminution or disintegration

Processes

With solidifying, consolidating or shaping

C241S021000, C241S023000

Reexamination Certificate

active

07429009

ABSTRACT:
An object of the present invention is to make it possible, in order to form the fine powder of the water-absorbent resin into a water-absorbing material having particle diameters favorable for practical use, that a water-absorbing material which has high agglomeration strength and is excellent in the quality performances is obtained at a low cost with good efficiency without causing the problems of the adhesion to such as treatment apparatus. As a means of achieving this object, a process according to the present invention for production of a water-absorbing material is a process for production of a water-absorbing material from a fine powder of a water-absorbent resin wherein the water-absorbing material is a particulate water-absorbing material having particle diameters larger than the fine powder, with the process comprising: a step (a) of adding an aqueous liquid to the fine powder of the water-absorbent resin with such as a high-speed stirring type continuous extrusion mixer50so that the overall average water content will be in the range of 20 to 60 weight %, whereby particles of the fine powder are agglomerated to thus obtain a particulate hydrous material70of the water-absorbent resin; and a step (b) of applying a mechanical compression force to the particulate hydrous material70and, at the same time, knead-pulverizing it, with such as a meat chopper apparatus30, thereby obtaining particulate agglomerates40of the water-absorbing material.

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