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Water absorbent resin composition and production method thereof

A resin composition and a water-absorbing technology, applied in the field of water-absorbing resin compositions, can solve the problems of not being very obvious, reducing the absorption ratio of the absorption ratio, and the effects of liquid flowability and diffusivity being not very obvious.

Active Publication Date: 2005-12-21
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the effect of improving liquid circulation and diffusivity by just adjusting the amount of addition is not very obvious
In addition, in order to allow the metal component to penetrate into the water-absorbent resin, the absorption ratio under no pressure and the absorption ratio under pressure are also reduced.
[0007] A technical solution in which a water-absorbent resin and a metal compound are dry-mixed and then a binder such as water is added (for example, Japanese Patent Laid-Open No. 61-257235 (publication date: November 14, 1986), International Publication WO 98 / 48857 (Open date: November 5, 1998)), since the metal component is dissolved in water and other binders, it penetrates into the inside of the water-absorbing resin, but the effect of improving fluid flow and diffusibility is not very obvious
In addition, due to damage caused by impact, friction, etc. during the manufacturing process, there will be problems with more powder

Method used

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  • Water absorbent resin composition and production method thereof
  • Water absorbent resin composition and production method thereof
  • Water absorbent resin composition and production method thereof

Examples

Experimental program
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Embodiment

[0158] Hereinafter, the present invention will be described in more detail through examples, but the present invention is not limited to these examples. For the sake of convenience, "parts by mass" will only be recorded as "parts", and "liters" will be recorded as "L" only. In addition, "mass %" is referred to as "wt%".

[0159] The various properties of the water-absorbent resin particles or the water-absorbent resin composition were measured by the following methods. Unless otherwise specified, the following measurement is performed under the conditions of room temperature (20-25°C) and humidity 50RH%.

[0160] In addition, when the water-absorbent resin composition is used as a final product form such as a sanitary material, since the water-absorbent resin composition absorbs moisture, it is appropriate to separate the water-absorbent resin composition from the final product, and under reduced pressure and low temperature After drying (for example, drying at 1 mmHg or less and ...

manufacture example 1

[0219] In a stainless steel twin-screw kneader with two E-shaped blades and a jacket with an internal volume of 10 liters, a reactor was formed by capping 505.6 g of acrylic acid, 4430.8 g of 37% by mass sodium acrylate aqueous solution, 497.0 g of pure water and 12.79 g of polyethylene glycol diacrylate (molecular weight 523) were dissolved to form a reaction liquid. Then, the reaction liquid was degassed for 20 minutes under a nitrogen atmosphere. Then, under stirring, 29.34 g of a 10% by mass sodium persulfate aqueous solution and 24.45 g of a 0.1% by mass L ascorbic acid aqueous solution were added to the reaction solution, and polymerization was started about 1 minute later. In addition, the resulting gel was pulverized and polymerized at 20 to 95°C, and 30 minutes after the initiation of the polymerization, the hydrogel-like crosslinked polymer was taken out. The obtained water-containing gel-like cross-linked polymer is subdivided to have a diameter of about 5 mm or less.

...

manufacture example 2

[0223] In a polypropylene container with an inner diameter of 80 mm and a volume of 1 liter covered with foamed styrene, a thermal insulation material, 185.4 g of acrylic acid and 0.942 g (0.07 mol%, relative to acrylic acid) diacrylic acid were stirred and mixed with a magnetic stirrer. Polyethylene glycol ester (molecular weight 523) and 1.13 g of 1.0% by mass diethylenetriamine pentaacetic acid and solution (A) obtained by aqueous sodium pentaacetate solution (A), and 148.53 g of 48.5% by mass sodium hydroxide aqueous solution were mixed and the temperature was adjusted to While the solution (B) obtained by 159.71 g of ion-exchanged water at 50°C, under the open system, quickly add (B) to (A) and mix. The heat of neutralization and the heat of dissolution raise the temperature of the liquid to about 100°C to obtain a monomer aqueous solution.

[0224] Add 4.29 g of 3% by mass sodium persulfate aqueous solution to the obtained monomer aqueous solution, stir for a few seconds, an...

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Abstract

The water-absorbent resin composition and its preparation method according to the present invention can provide a water-absorbent resin composition containing water-absorbent resin particles and a metal compound, the water-absorbent resin composition containing A water-absorbent resin composition comprising water-absorbent resin particles of an internal crosslinked structure, a nitrogen-containing ketone compound (A), and a divalent and / or trivalent and / or tetravalent water-soluble polyvalent metal salt, characterized in that, The total amount of the nitrogen-containing ketone compound (A) and the divalent and / or trivalent and / or tetravalent water-soluble polyvalent metal salt is 0.01 to 100 parts by mass relative to 100 parts by mass of the water-absorbent resin particles. Therefore, The water-absorbent resin composition is excellent in absorbency represented by centrifuge retention capacity (CRC) and absorption capacity under a pressure of 4.83 kPa (AAP), etc., liquid represented by saline flow conductivity (SFC) etc. It has excellent circulation diffusibility, excellent fluidity during moisture absorption, high damage resistance, excellent powder suppression effect, hardly penetrates into the water-absorbent resin particles added with metal compounds, and hardly causes separation of added metal compounds.

Description

Technical field [0001] The present invention relates to a water-absorbent resin composition suitable for use in sanitary materials such as paper diapers and sanitary napkins, so-called incontinence pads, and the like, and a method for producing the same. Background technique [0002] In sanitary materials such as paper diapers, sanitary napkins, and incontinence pads, absorbents composed of hydrophilic fibers such as pulp and water-absorbent resins are widely used in order to absorb body fluids. [0003] In recent years, such sanitary materials have made progress in terms of high performance and thinness. The amount of water-absorbent resin used per piece of sanitary material and the proportion of water-absorbent resin relative to the total absorbent body composed of water-absorbent resin and hydrophilic fibers The ratios tend to increase. In other words, by reducing the hydrophilic fibers with small bulk density and using more water-absorbent resins with excellent water absorpti...

Claims

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Application Information

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IPC IPC(8): C08L101/02
Inventor 鸟井一司中村将敏大河内弘子
Owner NIPPON SHOKUBAI CO LTD
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