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Process for producing aqueous-liquid-absorbing resin particles, aqueous-liquid-absorbing resin particles, absorbent, and absorbent article

A technology of resin particles and a manufacturing method, which is applied in the fields of the manufacture of water-based liquid-absorbent resin particles, water-based liquid-absorbent resin particles, absorbers and absorbent articles, can solve the problem that the resin particles damage the liquid permeability, reduce and reduce the absorption capacity. and other problems, to achieve the effect of excellent liquid permeability, excellent absorption performance, and stable absorption performance

Inactive Publication Date: 2017-12-01
SDP GLOBAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned method, although the liquid permeability between the swollen gels can be improved, there is a problem that the absorption capacity under a load is reduced, and the resin particles are broken during transportation and diaper manufacturing processes to reduce the liquid permeability. question

Method used

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  • Process for producing aqueous-liquid-absorbing resin particles, aqueous-liquid-absorbing resin particles, absorbent, and absorbent article
  • Process for producing aqueous-liquid-absorbing resin particles, aqueous-liquid-absorbing resin particles, absorbent, and absorbent article
  • Process for producing aqueous-liquid-absorbing resin particles, aqueous-liquid-absorbing resin particles, absorbent, and absorbent article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] Acrylic acid (a1-1) {Mitsubishi Chemical Co., Ltd., purity 100%} 131 parts, crosslinking agent (b-1) {pentaerythritol triallyl ether, Daiso Co., Ltd.} 0.44 parts, and deionized water 362 parts Stir, mix, and store at 3°C. Nitrogen gas is blown into the mixture so that the amount of dissolved oxygen is less than 1ppm, and then 0.5 part of 1% aqueous hydrogen peroxide solution, 1 part of 2% ascorbic acid aqueous solution and 2% of 2,2'-azobiamidinopropane di-salt are added 0.1 part of aqueous salt solution and mixed to start polymerization. After the temperature of the mixture reached 80°C, it was polymerized at 80±2°C for about 5 hours, thereby obtaining a hydrogel.

[0143] Next, this aqueous gel was minced with a mincer (12VR-400K manufactured by ROYAL Co., Ltd.), and 162 parts of a 45% sodium hydroxide aqueous solution was added and mixed and neutralized to obtain a neutralized gel. The neutralized hydrogel was further dried using a ventilated dryer {200°C, wind spe...

Embodiment 2

[0146] While stirring 100 parts of the resin particles (B-1) obtained in the same manner as in Example 1 at a high speed (a high-speed paddle mixer manufactured by Hosokawa Micron: a rotation speed of 2000 rpm), simultaneously add therein the resin particles having 4 or less carbon atoms. A mixture of 0.6 parts of propylene glycol of the polyhydric alcohol (c), 0.09 parts of ethylene glycol diglycidyl ether and 1.1 parts of water as the polyglycidyl compound (e), and a polyhydric alcohol having 4 or less carbon atoms ( c) 0.5 parts of propylene glycol, 1.2 parts of sodium aluminum sulfate dodecahydrate as polyvalent metal salt (d), and 2.3 parts of water are mixed and uniformly mixed, and then heated at 130° C. for 30 minutes to obtain the present Inventive aqueous liquid-absorbent resin particles (P-2).

Embodiment 3

[0148] While stirring 100 parts of the resin particles (B-1) obtained in the same manner as in Example 1 at a high speed (a high-speed paddle mixer manufactured by Hosokawa Micron: a rotation speed of 2000 rpm), simultaneously add the resin particles having 4 or less carbon atoms. 0.6 parts of propylene glycol as the polyhydric alcohol (c), 0.09 parts of ethylene glycol diglycidyl ether as the polyglycidyl compound (e), Klebosol30cal25 (colloidal dioxide produced by AZ Material Co., Ltd.) as the inorganic particle (f) A mixture of 1 part of silicon) and 1.1 parts of water, 0.5 parts of propylene glycol as a polyol (c) having 4 or less carbon atoms, and sodium aluminum sulfate dodecahydrate as a polyvalent metal salt (d) 1.2 parts and 2.3 parts of water were mixed and uniformly mixed, and then heated at 130° C. for 30 minutes to obtain aqueous liquid-absorbent resin particles (P-3) of the present invention.

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Abstract

Provided is a process for producing aqueous-liquid-absorbing resin particles which, even after transportation or a diaper production step, are capable of combining the property of enabling liquid passing through interstices among the swollen gel particles with absorption performance under load. The present invention is: a process for producing aqueous-liquid-absorbing resin particles (P), characterized by subjecting resin particles (B) that comprise a crosslinked polymer (A) comprising essential constituent units derived from a water-soluble vinyl monomer (a1) and / or a vinyl monomer (a2) which becomes a water-soluble vinyl monomer (a1) upon hydrolysis and from a crosslinking agent (b), to a surface treatment by a specific method using a C4 or lower polyhydric alcohol (c), a polyvalent-metal salt (d), and a polyvalent glycidyl compound (e); and the aqueous-liquid-absorbing resin particles (P).

Description

technical field [0001] The present invention relates to a method for producing aqueous liquid-absorbent resin particles, aqueous liquid-absorbent resin particles obtained by the production method, and an absorbent body and absorbent article using the particles. Background technique [0002] Currently, aqueous liquid-absorbent resins mainly composed of hydrophilic fibers such as pulp and acrylic acid (salt) are widely used as absorbents in sanitary materials such as disposable diapers, sanitary napkins, and incontinence pads. From the standpoint of recent improvement in QOL (quality of life), these sanitary materials need to be shifted to lighter and thinner materials, and accordingly, the amount of hydrophilic fibers used is expected to be reduced. Therefore, the water-based liquid-absorbent resin itself is required to have the functions of liquid diffusivity and initial absorption in the absorbent body, which have been borne by hydrophilic fibers so far, and liquid absorpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08J3/24
CPCC08J3/12C08J3/24B01J2220/68C08F220/06B01J20/267B01J20/28016B01J20/30C08F216/125C08F8/44C08J3/128C08J2300/14C08K3/105C08K3/11C08F8/12C08J3/205C08J3/245C08K5/0025C08K5/053
Inventor 松原佑介吉本辽赤羽祥
Owner SDP GLOBAL
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