Water-Absorbent Resin Powder And Absorber And Absorbent Article Using The Same

A technology of resin powder and water absorption, which is applied in the field of absorption performance of absorbent articles. It can solve the problems of easy mutual contact, occlusion, and the inability of the absorber to exert its absorption capacity. Effect

Active Publication Date: 2014-09-03
LIVEDO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the absorbent body has a high content of the water-absorbent resin powder, the swelled water-absorbent resin powder easily comes into contact with each other
As a result, the gaps serving as passages for body fluids are blocked, and the absorbent body cannot exert its proper absorbing capacity.

Method used

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  • Water-Absorbent Resin Powder And Absorber And Absorbent Article Using The Same
  • Water-Absorbent Resin Powder And Absorber And Absorbent Article Using The Same
  • Water-Absorbent Resin Powder And Absorber And Absorbent Article Using The Same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0164] The present invention will be described in detail through the following examples, but the present invention is not limited by the following examples, and changes and implementations within the scope of the gist of the present invention are all included in the scope of the present invention.

[0165] [Evaluation method]

[0166] (Measuring method of bulk density)

[0167] The bulk density was measured in accordance with JIS K6219-22005. The water-absorbent resin powder as a sample was injected into the center of a cylindrical container (a stainless steel container with a diameter of 100 mm and a volume of 1000 ml) of known mass and volume from a height of 50 mm or less from the lower end of the container. At this time, a sufficient amount of sample is injected into the cylindrical container so that the injected sample forms a triangular cone above the upper end of the cylindrical container. Then, use a scraper to scrape off the excess sample above the upper end of the ...

Synthetic example 1

[0188] 155 parts by mass (2.15 parts by mole) of a water-soluble ethylenically unsaturated monomer (a1-1) {acrylic acid, manufactured by Mitsubishi Chemical Corporation, purity 100%}, 0.6225 parts by mass (0.0024 parts by mole) of an internal crosslinking agent (b1) {Pentaerythritol triallyl ether, manufactured by Daiso Co., Ltd.} and 340.27 parts by mass of deionized water were kept at 1°C while stirring and mixing. Nitrogen gas is introduced into the mixture to reduce the amount of dissolved oxygen to below 0.1 ppm, then add and mix 0.31 parts by mass of 1% aqueous hydrogen peroxide, 1.1625 parts by mass of 1% aqueous ascorbic acid and 2.325 parts by mass of 0.5% 2, 2'-Azobis[2-methyl-N-(2-hydroxyethyl)-propionamide] aqueous solution to start polymerization. When the temperature of the mixture reaches 85°C, polymerize at 85±2°C for about 10 hours to obtain a hydrogel (1). Next, while crushing 502.27 parts by mass of the hydrogel (1) with a grinder (12VR-400K manufactured by...

Synthetic example 2

[0190] In addition to changing "dry the chopped gel (2) with an airflow type belt dryer {200 °C, wind speed 5 m / s}" to "dry the chopped gel with an air flow type belt dryer {150 °C, wind speed 5 m / s} A water-absorbent resin powder 2 was obtained in the same manner as in Synthesis Example 1 except for "crushed gel (2)".

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PUM

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Abstract

To provide an absorber that has a high absorption speed, is unlikely to cause a liquid to remain on a skin-contacting surface, has excellent dry feeling, and is unlikely to cause excreted body fluid to return, and a water-absorbent resin powder that can be suitably used in the absorber. A water-absorbent resin powder of the present invention is characterized by meeting the following requirements (a) to (d): (a) a bulk density: 0.45 g / ml to 0.62 g / ml; (b) an absorption speed by a vortex method: 20 seconds to 50 seconds; (c) a liquid-passing speed under load: 10 seconds or less; and (d) a moisture absorption blocking ratio: 5% or less. An absorber of the present invention uses the water-absorbent resin powder of the present invention. An absorbent article of the present invention includes the absorber of the present invention.

Description

technical field [0001] The present invention relates to a technology for improving the absorption performance of absorbent articles such as disposable diapers and sanitary napkins. Background technique [0002] Absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads have an absorbent body that absorbs and retains body fluids such as urine and menstrual blood excreted from the body, a soft liquid-permeable top sheet placed on the body-contacting side, and a soft liquid-permeable top sheet placed on the body-contacting side. Liquid-impermeable backsheet on the opposite side. The absorber is generally composed of a hydrophilic fibrous base material such as wood pulp and water-absorbent resin powder. The bodily fluid is absorbed by the absorbent body through the top sheet made of nonwoven fabric or the like. The absorbed body fluid is diffused by the fibrous base material such as wood pulp inside the absorber, absorbed and held in the water-absor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F13/532C08F2/44
CPCA61F2013/53445C08J3/245A61F2013/530591A61F2013/530788B01D15/00C08F2810/00C08F22/02C08J2333/02C08F2/44A61F13/5323A61L15/60C08L33/00
Inventor 太田义久西田素子池内昌俊
Owner LIVEDO CORP
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