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Water-absorbing resin particles and production method therefor

A technology of resin particles and manufacturing method, applied in absorbent pads, underwear, clothing and other directions, can solve the problems of weak mechanical strength of particles, reduced moisture absorption resistance, blockage of process particles, etc., and achieves high liquid permeability, high water retention capacity, and dryness Excellent effect

Pending Publication Date: 2021-07-23
三大雅株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned methods, the mechanical strength of the particles is weak, and fine powder is easily generated in the diaper manufacturing process, and the fine powder may cause gel adhesion in the diaper manufacturing process, thereby causing the problem of particle clogging in the process.
In addition, a method of increasing the absorption rate by reducing the particle size of the water-absorbent resin particles in the sieving step is known (Patent Document 5). However, when the particle size of the water-absorbent resin is reduced, the moisture absorption resistance decreases, as described above. Has the problem of causing process particle clogging in the diaper manufacturing process

Method used

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  • Water-absorbing resin particles and production method therefor
  • Water-absorbing resin particles and production method therefor
  • Water-absorbing resin particles and production method therefor

Examples

Experimental program
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Effect test

Embodiment

[0118] The present invention will be further described below through examples and comparative examples, but the present invention is not limited thereto. Hereinafter, unless otherwise specified, parts represent parts by weight, and % represents % by weight.

[0119] Absorption after 5 minutes of DW, water retention, capillary absorption, particle defect degree, absorption under load, gel liquid passing speed, liquid return, whitening speed, hygroscopic adhesion test, odor sensory test at 25±2°C, humidity 50 The ±10% chambers were measured by the following methods, respectively. It should be noted that the temperature of the physiological saline used was previously adjusted to 25° C.±2° C. for use.

[0120]

[0121] The water-absorbent resin particles and physiological saline were used for measurement according to the DW method described in paragraphs 0117 to 0121 of JP-A-2014-005472, and the absorption amount (g ).

[0122]

[0123] Add 1.00 g of the test sample to a te...

Embodiment 1

[0149] Acrylic acid (a1) {Mitsubishi Chemical Co., Ltd., purity 100%} 131 parts, internal crosslinking agent (b-1) {pentaerythritol triallyl ether, Daiso Co., Ltd.} 0.44 parts, and deionized water 362 parts were stirred • Keep at 3°C ​​while mixing. Nitrogen was flowed into the mixture so that the amount of dissolved oxygen was 1 ppm or less, and then 0.5 parts of a 1% hydrogen peroxide solution, 1 part of a 2% ascorbic acid solution, and 2% of 2,2'-azodiamidinopropane dihydrochloride were added and mixed. 0.1 part of aqueous solution 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 was obtained.

[0150] Next, this hydrogel was subdivided into about 1 mm square with scissors, and 162 parts of 45% sodium hydroxide aqueous solution was added. Further use a shredder with a grid diameter of 16mm (12VR-400K manufactured by ROYAL company) to chop 4 times at a gel temperature of 80°C, ...

Embodiment 2

[0153] Water absorbent resin particles (P-2) were obtained in the same manner as in Example 1, except that ethylene glycol diglycidyl ether as a surface crosslinking agent was used in an amount of 0.12 parts by weight.

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Abstract

Provided are: water-absorbing resin particles which, after absorbing water, emit no odor due to a volatile component and which rapidly extract the liquid from the nonwoven fabric in the beginning to attain excellent drying properties and have no problems concerning a rash, etc.; and an absorbent and an absorbent article each comprising or including the water-absorbing resin particles. The water-absorbing resin particles of the present invention comprise a crosslinked polymer (A) comprising essential constituent units derived from a water-soluble vinyl monomer (a1) and / or a hydrolyzable vinyl monomer (a2) and from a crosslinking agent (b), the particles having indefinite shapes resulting from crushing and satisfying the following (i) and (ii). (i) The water retention after 60 minutes in terms of 0.9 wt% physiological saline solution per unit weight is 30-50 g / g. (ii) The capillary absorption (CAP) after 5 minutes defined by the following equation (1) is 6 g / g or greater. CAP (g / g)=(absorption after 5-minute DW)-(water retention after 5 minutes).

Description

technical field [0001] The present invention relates to water-absorbent resin particles and a method for producing the same. Background technique [0002] In hygienic materials such as disposable diapers, sanitary napkins, and incontinence pads, combinations of hydrophilic fibers such as pulp and water-absorbing resins such as acrylic acid (salt) as main raw materials are widely used as absorbents. In recent years, consumers have tended to demand more comfort, and the demand for such hygienic materials has been shifting towards higher dryness and thinner types. Along with this, it is desired to improve dryness and further reduce the amount of hydrophilic fibers used. Therefore, the water-absorbent resin itself is required to play the roles of high initial absorption rate and liquid diffusivity that have been borne by hydrophilic fibers so far. In addition, in order to improve the surface dryness of the absorbent body, there is a strong demand for water-absorbent resin parti...

Claims

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Application Information

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IPC IPC(8): C08J3/24A61F13/15A61F13/53C08F8/00
CPCA61F13/15C08J3/24A61F13/53C08F8/00
Inventor 松山泰知松原佑介宫岛徹
Owner 三大雅株式会社
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