Water-absorbing resin particles, process for producing same, and absorbent object and absorbent article both comprising or including same

A technology of resin particles and manufacturing methods, applied in chemical instruments and methods, other chemical processes, etc., which can solve the problems of long-term use of water-absorbent articles, obstruction of hygienic materials, and reduction of water-absorbing performance of water-absorbent resins, etc.

Inactive Publication Date: 2018-12-21
SDP GLOBAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the method described in Patent Document 1, although the absorption rate of the absorbent body and the liquid permeability between the swollen gels are improved, the water-absorbing performance of the water-absorbent resin is lowered due to the increase in the crosslinking density, which hinders sanitary materials, Prolonged use of absorbent articles and causes preventing rashes in use

Method used

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  • Water-absorbing resin particles, process for producing same, and absorbent object and absorbent article both comprising or including same
  • Water-absorbing resin particles, process for producing same, and absorbent object and absorbent article both comprising or including same

Examples

Experimental program
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Embodiment 1

[0141] 135 parts of acrylic acid (manufactured by Mitsubishi Chemical Corporation, purity 100%, the same below), 0.68 parts of pentaerythritol triallyl ether (manufactured by DAISO Corporation, the same below), sodium bisulfite (manufactured by Wako Pure Chemical Industries, Ltd., purity 66%, hereinafter the same) 0.02 parts and 363 parts of deionized water were stirred and mixed while maintaining at 3°C. Nitrogen gas was blown into the mixture to reduce the amount of dissolved oxygen to 1 ppm or less, and then 0.5 parts of 1% aqueous hydrogen peroxide solution, 1 part of 2% aqueous ascorbic acid solution and 2% of 2,2'-azobisamidinopropane di-salt were added. 0.3 parts of aqueous salt solution and mixed to initiate polymerization. After the temperature of the mixture reached 80°C, it was polymerized at 80±2°C for about 5 hours, whereby a hydrogel (1) was obtained.

[0142] Next, the obtained hydrogel (1) was completely chopped with a mincer (12VR-400K manufactured by ROYAL C...

Embodiment 2

[0145] Change "0.68 parts of pentaerythritol triallyl ether" to "0.2 parts of pentaerythritol", change "0.02 parts of sodium bisulfite" to "1.9 parts of phosphoric acid (manufactured by Kanto Chemical Co., Ltd., purity 85%, the same below)", Changed "moisture content 6%" to "moisture content 8%", changed "2% aqueous solution of ethylene glycol diglycidyl ether 4 parts" to "3% aqueous solution of ethylene glycol diglycidyl ether 6.6 parts ", and obtained the water-absorbent resin particles (2) of the present invention in the same manner as in Example 1.

Embodiment 3

[0147] Change "0.68 parts of pentaerythritol triallyl ether" to "0.82 parts of pentaerythritol triallyl ether", change "0.02 parts of sodium bisulfite" to "0.008 parts of sodium bisulfite", and change "moisture content to 6 %" was changed to "moisture content is 4%", and "4 parts of a 2% aqueous solution of ethylene glycol diglycidyl ether" was changed to "5 parts of a 1% aqueous solution of ethylene glycol diglycidyl ether". The water-absorbent resin particles (3) of the present invention were obtained in the same manner as in Example 1.

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Abstract

Provided are water-absorbing resin particles which retain the intact water-absorbing performance and can attain both absorption rate and liquid permeation through swelled gel particles. The present invention is: water-absorbing resin particles which comprise a crosslinked polymer (A) of a monomer composition that comprises an internal crosslinking agent (b) and a water-soluble vinyl monomer (a1) and / or a vinyl monomer (a2) which becomes a water-soluble vinyl monomer (a1) upon hydrolysis, and which further include an inorganic acid (c) containing one or more protons and having a pKa of 4.5-10,and which have a water-soluble content of 20% or less; a process for producing the water-absorbing resin particles which includes a step in which the surface of resin particles (B) that comprise the crosslinked polymer (A) and the inorganic acid (c) and that have a water content of 3-8 wt% is crosslinked with a surface-crosslinking agent (d); and an absorbent object comprising the water-absorbingresin particles.

Description

technical field [0001] The present invention relates to water-absorbent resin particles, a method for producing the same, an absorbent body and an absorbent article containing the water-absorbent resin particles. Background technique [0002] In hygienic materials such as disposable diapers, sanitary napkins, and incontinence pads, hydrophilic fibers such as pulp and water-absorbent resins (abbreviated as Super Absorbent Polymer, also known as Super Absorbent Polymer) are widely used as main raw materials such as acrylic acid (salt) as absorbents. SAP) combination. From the viewpoint of improving QOL (Quality Of Life) in recent years, the demand for these hygienic materials is shifting towards lighter and thinner materials. Along with this, it is desired to reduce the amount of hydrophilic fibers used. Therefore, in the absorbent body, SAP itself is required to play the role played by the hydrophilic fiber until now. For example, reduction of leakage through high-speed ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12B01J20/26B01J20/30C08F20/06
CPCB01J20/26B01J20/30C08F20/06C08J3/12
Inventor 富冈惠上田祐介高桥一裕
Owner SDP GLOBAL
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