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Water-absorbing resin

A water-absorbing, resin-based technology, applied in absorbent pads, other chemical processes, bandages, etc., can solve problems such as impaired hand feel, difficult absorbent body absorption performance and hand feel, and inability to meet absorption performance, and achieve the effect of reducing reverse osmosis.

Active Publication Date: 2021-06-25
SUMITOMO SEIKA CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally, when the content of the water-absorbent resin in the absorbent body is small, the texture (softness) of the absorbent body is excellent, but on the other hand, the absorption performance represented by the amount of reverse osmosis cannot be satisfied.
Therefore, if the content of the water-absorbent resin is increased, the absorption performance after absorption of body fluids and the like tends to improve, but the feel of the absorbent body is impaired.
In addition, it is difficult to uniformly disperse a large amount of water-absorbent resin in the absorbent body, and performance improvement corresponding to the increase in water-absorbent resin cannot necessarily be ensured.
As such, it is difficult to make the absorber satisfy both the absorption performance and the hand feeling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0132] Hereinafter, examples are shown and the present invention will be described in more detail, but the present invention is not limited to the following examples.

[0133]

[0134] [Evaluation test of water-absorbent resin]

[0135] The water-absorbent resins obtained in the following examples and comparative examples were evaluated in various tests shown below. Hereinafter, each test method is demonstrated.

[0136] 1) Absorption capacity of normal saline

[0137] In a 500 mL capacity beaker, 500 g of a 0.9% by mass sodium chloride aqueous solution (physiological saline) was weighed, and 2.0 g of the water-absorbent resin was dispersed without forming lumps while stirring at 600 r / min. Stirring was continued for 60 minutes to fully swell the water-absorbent resin. Then, the mass Wa (g) of a 200mmφ standard sieve with a mesh size of 75 μm is measured in advance, and the contents of the above-mentioned beaker are filtered using the standard sieve. In the state, let it...

Embodiment 1

[0180]Prepare a round-bottomed cylinder with an inner diameter of 110 mm and a capacity of 2 L equipped with a reflux condenser, a dropping funnel, a nitrogen gas introduction pipe, and a stirring blade with two stages of 4 pitched blades with a blade diameter of 50 mm as an agitator. Detachable flask. In this flask, 300 g of n-heptane was weighed as a hydrocarbon dispersion medium, and 0.62 g of a maleic anhydride-modified ethylene-propylene copolymer (Mitsui Chemicals, Inc., Hi-WAX1105A) was added as a polymeric dispersant. Heat to dissolve while stirring, then cool to 50°C.

[0181] On the other hand, 78 g (0.87 moles) of an 80 mass % acrylic acid aqueous solution was weighed in a 500 mL Erlenmeyer flask, and while cooling from the outside, 120.6 g of a 22.4 mass % sodium hydroxide aqueous solution was added dropwise for neutralization, and then Add 1.170 g of hydroxyethylcellulose (Sumitomo Seika Co., Ltd., HEC AW-15F) as a thickener, 0.055 g (0.203 mmol) of potassium per...

Embodiment 2

[0185] Prepare a round-bottomed cylinder with an inner diameter of 110 mm and a capacity of 2 L equipped with a reflux condenser, a dropping funnel, a nitrogen gas introduction pipe, and a stirring blade with two stages of 4 pitched blades with a blade diameter of 50 mm as an agitator. Detachable flask. In this flask, 300 g of n-heptane was weighed as a hydrocarbon dispersion medium, and 0.52 g of a maleic anhydride-modified ethylene-propylene copolymer (Mitsui Chemicals, Inc., Hi-WAX1105A) was added as a polymeric dispersant. Heat to dissolve while stirring, then cool to 50°C.

[0186] On the other hand, 65 g (0.72 moles) of an 80 mass % acrylic acid aqueous solution was weighed in a 500 mL Erlenmeyer flask, and while cooling from the outside, 100.5 g of a 22.4 mass % sodium hydroxide aqueous solution was added dropwise for neutralization, and then Add 0.065 g of hydroxyethyl cellulose (Sumitomo Seika Co., Ltd., HEC AW-15F) as a thickener, 0.046 g (0.170 mmol) of potassium p...

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Abstract

Provided are: a water-absorbing resin that can reduce the amount of backflow of the liquid being absorbed, even when the water-absorbing resin is used at a low content in an absorbent body; and an absorbent article that uses an absorbent body that contains the absorbent resin. The water-absorbing resin is a crosslinked polymer from water-soluble ethylenically unsaturated monomer and has a dry-up index, as given by formula (1), of at least 1.85. The overall absorption capacity term alpha and the water absorption rate term beta in formula (1) are given by formulas (2) and (3). The formula (1) is that the dry-up index is equal to the product of the overall absorption capacity term alpha and the water absorption rate beta; the formula (1) is that the water absorption rate beta is equal to the product of the dynamic water absorption rate and the static water absorption rate.

Description

technical field [0001] The present invention relates to a water-absorbent resin, a method for producing the same, and the like. More specifically, it relates to a water-absorbent resin constituting an absorbent body of an absorbent article suitable for sanitary materials such as sanitary products and disposable diapers, a method for producing the same, and the like. Background technique [0002] Absorbent articles for hygienic materials such as sanitary products and disposable diapers are generally composed of absorbent bodies mainly composed of hydrophilic fibers and water-absorbent resins. Examples of known water-absorbent resins include starch-acrylonitrile graft copolymerization Hydrolyzed product, neutralized product of starch-acrylic acid graft copolymer, saponified product of vinyl acetate-acrylic acid ester copolymer, partially neutralized product of polyacrylic acid, etc. [0003] Generally, when the content of the water-absorbent resin in the absorbent body is sma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/06A61F13/53B01J20/26B01J20/28C08J3/24
CPCC08F20/06A61F13/15203A61F2013/530737A61F2013/530481A61F2013/530642C08J3/245C08J2333/02B01J20/267B01J20/261B01J2220/68B01J20/28011C08J3/075C08F220/06A61F13/53A61L15/24A61L15/60C08F8/00C08F2/32A61L15/62B01J20/24
Inventor 鄙山铁博成顺吉
Owner SUMITOMO SEIKA CHEM CO LTD
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