Water-absorbent resin powder, absorbent body and absorbent article using the water-absorbent resin powder

A resin powder and absorber technology, which is applied in the directions of absorbent pads, solid adsorbent liquid separation, chemical instruments and methods, etc., can solve the problems of easy mutual contact, occlusion, and the inability of the absorber to exert its absorption capacity, and achieves difficult backflow and absorption. The effect of fast speed and low absorption speed

Active Publication Date: 2016-09-14
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, absorbent body and absorbent article using the water-absorbent resin powder
  • Water-absorbent resin powder, absorbent body and absorbent article using the water-absorbent resin powder
  • Water-absorbent resin powder, absorbent body and absorbent article using the water-absorbent resin powder

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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Abstract

The present invention provides an absorbent body and a water-absorbent resin powder suitable for the absorbent body. The absorption body has a fast absorption speed, the liquid is not easy to remain on the skin contact surface, the feeling of dryness is excellent, and the excreted body fluid is not easy to flow back. The water-absorbent resin powder of the present invention is characterized in that it satisfies the following requirements (a) to (d): (a) Bulk density: 0.45 g / ml to 0.62 g / ml; (b) Absorption speed measured by the vortex method : 20 seconds to 50 seconds; (c) Liquid passing speed under load: 10 seconds or less; (d) Moisture blocking rate: 5% or less. The absorbent body of the present invention uses the water absorbent resin powder of the present invention. The absorbent article of the present invention includes the absorbent body 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 Patents(China)
IPC IPC(8): A61F13/532C08F2/44
CPCA61F13/5323A61L15/60C08F2/44C08J3/245A61F2013/53445A61F2013/530591A61F2013/530788C08J2333/02B01D15/00C08L33/00C08F22/02C08F2810/00
Inventor 太田义久西田素子池内昌俊
Owner LIVEDO CORP
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