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Water absorbent resin and method for production thereof

A water absorbent, water absorption technology, applied in the field of water absorbent, absorbent products and production of water absorbent, can solve the problems of sanitation, peculiar smell, unqualified, etc.

Active Publication Date: 2008-02-06
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This may lead to odor and hygienic problems, or to provide products, as the case may be, in favor of reducing the thickness of the absorbent article so as to reduce the amount of hydrophilic fiber pulp etc. constituting the absorbent article, but thus increasing the moisture content of the absorbent article. The probability of the absorbent contacting the user's skin—in such a large environment, it may not be qualified

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0164] To 100 parts by weight of the water-absorbent resin (1) obtained as described above, 5 parts by weight of water and 1 part by weight of sodium bisulfite (manufactured by Wako Pure Chemical Co., Ltd., special grade chemical) as a sulfur-containing reducing agent were added by spraying . Spray addition was performed using a hollow cone nozzle 1 / 4M-K010 (manufactured by Ikeuchi Corporation, droplet diameter: 70 μm to 150 μm). The mixture thus obtained was spread in a layer with a thickness of 5 cm and allowed to stand and cure for 30 min in a ventilated hot-air drier with an atmosphere temperature set at 80°C. The mixture subjected to the curing treatment was passed through a sieve having a mesh size of 850 μm to obtain a water absorbent (1).

Embodiment 2

[0166] To 100 parts by weight of the water-absorbent resin (1), an aqueous solution containing 10 parts by weight of water and ] parts by weight of the above-described sodium bisulfite was added by spraying. Spray addition was carried out using the hollow cone nozzle 1 / 4M-K010 (droplet diameter: 70 μm to 150 μm) described above. The mixture thus obtained was spread in a layer with a thickness of 5 cm and allowed to stand and cure for 30 min in a ventilated hot-air drier with an atmosphere temperature set at 80°C. The mixture subjected to the curing treatment was passed through a sieve having a mesh size of 850 μm to obtain a water absorbent (2).

Embodiment 3

[0172] To 100 parts by weight of the water-absorbent resin (2) obtained as described above, an aqueous solution containing 3 parts by weight of water and 0.5 parts by weight of the above-described sodium bisulfite was added by spraying. Spray addition was performed using the above-mentioned hollow cone nozzle 1 / 4M-K010 (droplet diameter: 70 μm to 150 μm). The mixture thus obtained was spread in a layer with a thickness of 5 cm, and allowed to stand and cure for 30 min in a ventilated hot-air drier with an atmosphere temperature set at 80°C. The mixture subjected to the solidification treatment was passed through a sieve having a mesh size of 850 μm to obtain a water absorbent (3).

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Abstract

According to the present invention, a balance between lowering of the fine powder generated during the production, and lowering of the amount of residual monomer in the resulting water absorbent resin can be achieved. More particularly, according to the present invention, a water absorbent resin which includes a small amount of residual monomer and has a favorable physical property can be obtained while effectively reutilizing the fine powder generated in the production step of the water absorbent resin, without increasing using amount of an additive (at least one selected from the group consisting of thermal initiators, oxidizing agents and reducing agents) for reducing the residual monomer. In other words, the method for production of a water absorbent resin of the present invention is a method in which the residual monomer can be efficiently reduced, and in addition, an effect in terms of the production cost, i.e., recycling of the fine powder, can be also achieved similarly to conventional recycling methods of fine powder through agglomeration.

Description

technical field [0001] The present invention relates to water absorbents, absorbent articles and methods of producing water absorbents. Background technique [0002] In recent years, water absorbents intended to absorb body fluids have been widely used in sanitary products such as disposable diapers, sanitary napkins, incontinence pads and the like. As such water absorbents, for example, partially neutralized polyacrylic acid cross-linked polymers are known which are usually used in the form of particles, although those used in the form of sheets, fibers and the like are also known. [0003] Features expected to be possessed by such water absorbents include water absorption properties, ie, high absorption capacity under no-load conditions and, of course, high absorption capacity under load. However, hygienic aspects and odor issues must also be considered as it may be used in hygiene products such as disposable diapers. When it comes to hygienic aspects and odor problems, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12
Inventor 木村一树藤野真一和田克之石崎邦彦
Owner NIPPON SHOKUBAI CO LTD
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