Water-absorbing hydrogel, and production method therefor

A manufacturing method and a technology for hydrogels, which are applied in the field of water-absorbing hydrogels, can solve the problems of lack of flexibility, difficult to process into sheets, and hard dry bodies, and achieve the effects of excellent water absorption and expanded use range.

Inactive Publication Date: 2019-07-30
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Water-absorbent polymers are widely used in disposable diapers as hydrogels with water-absorbing properties, but their dried bodies are hard and have no flexibility, so they are easy to break, and it is difficult to process them into sheets, etc.

Method used

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  • Water-absorbing hydrogel, and production method therefor
  • Water-absorbing hydrogel, and production method therefor
  • Water-absorbing hydrogel, and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0155] [Manufacturing Example 1: Manufacture of 6% laponite XLG aqueous dispersion]

[0156] 7 parts of 35% aqueous solution of oligomeric sodium polyacrylate (weight average molecular weight: 15,000: manufactured by Sigma Aldrich), 10 parts of glycerin (manufactured by Junsei Chemical Co., Ltd.), 0.5 parts of phenoxyethanol (manufactured by Junsei Chemical Co., Ltd.), 70.5 parts of water The parts were mixed and stirred at 25°C until a homogeneous solution was obtained. 6 parts of synthetic laponite XLG (manufactured by BYK Aditybs Co., Ltd.) was gradually added thereto, and after uniform dispersion, 3 parts of a 10% aqueous solution of citric acid (manufactured by Junsei Chemical Co., Ltd.) was added. While vigorously stirring the mixture, the temperature was raised to 80°C, and after stirring was continued at 80°C for 30 minutes, it was cooled to 25°C in an ice-water bath while stirring, and 3 parts of a 10% aqueous solution of citric acid (manufactured by Junsei Chemical C...

manufacture example 2

[0157] [Manufacture example 2: Manufacture of 2% sodium polyacrylate aqueous solution]

[0158] 10 parts of glycerin (manufactured by Junsei Chemical Co., Ltd.), 1.5 parts of disodium hydrogen citrate 1.5 hydrate (manufactured by Junsei Chemical Co., Ltd.), 0.5 parts of phenoxyethanol (manufactured by Junsei Chemical Co., Ltd.), and 86 parts of water were mixed, Stir at 25°C until a homogeneous solution becomes. After adding 2 parts of highly polymerized sodium polyacrylate (Biscomet NP-800: manufactured by Showa Denko Co., Ltd.) little by little while vigorously stirring it, the vigorous stirring was continued at 25°C (for about 5 hours) until the highly polymerized sodium polyacrylate was completely The target substance was obtained until it was dissolved.

manufacture example 3

[0159] [Manufacture Example 3: Manufacture of 20% laponite XLG aqueous dispersion]

[0160] Mix 7.5 parts of a 20% aqueous solution of disodium hydroxyethylidene diphosphate (Kyrest PH-212: manufactured by Kyrest Co., Ltd.), 0.5 parts of phenoxyethanol (manufactured by Junsei Chemical Co., Ltd.), and 72 parts of water, and stir at 25°C until until it becomes a homogeneous solution. 20 parts of synthetic hectorite XLG (manufactured by BYK Aditybs) was added little by little thereto. The temperature of the mixture was raised to 80°C while vigorously stirring, and stirring was continued at 80°C for 30 minutes, then cooled to 25°C in an ice-water bath to obtain the target substance.

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Abstract

[Problem] To provide: a hydrogel which exhibits excellent water-absorbing properties, even if dried, and which exhibits flexibility, shape stability, and shape retention properties; and a production method therefor. [Solution] This hydrogel includes: a water-soluble organic polymer (A); a silicate (B); a dispersant (C) for the silicate; and a water-absorbing polymer (D). This method for producingthe hydrogel includes: a formation step (a1) for forming a hydrogel including the water-soluble organic polymer (A), the silicate (B), the dispersant (C) for the silicate, the water-absorbing polymer(D), and at least one type of solvent selected from the group consisting of water and a water-soluble organic solvent (F); and a solvent removal step (b1) in which a portion of the solvent in the hydrogel is removed as desired.

Description

technical field [0001] The present invention relates to a water-absorbent gel and a method for producing the same, and more specifically, to a water-absorbent hydrogel that is excellent in water absorbency even when dried, and has flexibility, shape stability, and shape retention , Dried gels, sheet gels and methods for their manufacture. Background technique [0002] Water-absorbing polymers are widely used in disposable diapers as hydrogels with water-absorbing properties, but their dried bodies are hard and have no flexibility, so they are easy to break, and it is difficult to process them into sheets and other uses. In general, water-absorbent polymers are pulverized into granular or powdery forms, and they need to be coated with a support such as fibers to prevent scattering and outflow. Therefore, processing in consideration of shape maintenance and swelling due to water absorption is required, which is a limitation in use, and therefore a water-absorbing material tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08K3/34C08L33/02C08L41/00C08L101/14
CPCC08J3/075C08K3/34C08L33/02C08L41/00C08L101/14C08J2300/14C08J2333/06C08J2301/28C08J2341/00C08J2433/06C08J2429/04C08J9/28C08J5/06C08J3/212C08L101/00C08J2333/02C08J2205/022C08K3/013C08J2333/08C08K3/36C08K7/20
Inventor 工藤佳宏
Owner NISSAN CHEM IND LTD
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