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Water-holding material and water-absorbing gel composition excellent in light resistance

A water-retaining agent and water-absorbing technology, used in chemical instruments and methods, other chemical processes, etc., can solve the problems of poor stability, inability to maintain the shape of gel-like substances, insufficient light resistance of the gel, etc., and achieve high water-retention capacity. , the effect of excellent water dispersibility

Inactive Publication Date: 2013-07-24
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A water-retaining agent composed of a conventional water-absorbing resin such as the above has a water-absorbing gel that is not stable against sunlight and ultraviolet rays
That is, if the water-absorbing gel obtained after the water-retaining material absorbs water is exposed to sunlight and ultraviolet rays, it will deteriorate and become fluid within a few hours, and in many cases it will become impossible to maintain its gel-like form
[0005] Therefore, when such a water-absorbing resin is used as a water-retaining agent (water-absorbing gel), it is especially used in gardening water-retaining agents, ornamental water-retaining agents, soil water-retaining agents, fragrance gelling agents, and deodorants. When used in fields that require light resistance, such as gelling agents and artificial snow, the lack of light resistance of the gel has become a major obstacle in practical applications.

Method used

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  • Water-holding material and water-absorbing gel composition excellent in light resistance
  • Water-holding material and water-absorbing gel composition excellent in light resistance

Examples

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preparation example Construction

[0038] (Preparation of carbon black-containing water-absorbent resin)

[0039] While stirring 300 parts by weight of ion-exchanged water with a homomixer (2000 rpm), 0.1 part by weight of carbon black (A) having self-dispersibility in water was added to prepare a carbon black dispersion. Then, under agitation (2000 rpm) of the carbon black dispersion, 10 parts by weight of a water-absorbent resin (a water-absorbent resin composed of a cross-linked polymer of sodium acrylic acid salt and with a water absorption capacity of ion-exchanged water of 400 g / g) was added. (For example, Sunfresh (Sanfresh (registered trademark) GT-1) manufactured by Sanyo Chemical Industry Co., Ltd. (Sanyo Chemical Industry Co., Ltd.)) to prepare a water-absorbent gel composition. The obtained water-absorbent gel composition was placed in a circulating air dryer, and dried at 120° C. for 3 hours to obtain a carbon black-containing water-absorbent resin.

[0040] (Detection of shading rate)

[0041]In...

manufacture example 1

[0128] Cetyltrimethylammonium bromide adsorption specific surface area (CTAB) 140m 2 / g and carbon black (1) having a DBP (dibutyl phthalate) absorption value of 128 ml / 100 g was oxidized to obtain oxidized carbon black. The oxidation treatment is to add 100g carbon black to a concentration of 1.0mol / dm 3 Sodium peroxodisulfate aqueous solution 3dm 3 , at a reaction temperature of 60°C, a reaction time of 10 hours, and a stirring speed of 0.12s -1 under the conditions.

[0129] After the reaction is over, the oxidized carbon black is separated from the reaction solution by filtration, and the oxidized carbon black is mixed with a concentration of 1.0mol / dm 3 Aqueous sodium hydroxide solution for neutralization. After neutralization, use a centrifugal separator (manufactured by Hitachi Koki (Hitachi Koki), CR22F) at 7.5×10 -3 S -1 , 15 minutes under the conditions of classification. Then, after the supernatant was separated from the remaining salt with an ultrafiltration...

manufacture example 2

[0131] A carbon black dispersion (A2) having a dispersion concentration of 20% by weight was produced in the same manner as in Production Example 1 except that the classification treatment in Production Example 1 was not performed. The viscosity of the carbon black dispersion (A2) at 25° C. (after standing at 70° C. for one week) was 4.93 mPa·s, and the carbon black (a2) in (A2) already had self-dispersing properties. (a2) has a shading rate of 90.0%.

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Abstract

The water-holding material and water-absorbing gel composition according to the invention contain carbon black which is self-dispersible in water and exhibits excellent dispersibility in water and which can impart light resistance to a water -absorbing resin when added thereto even in a small amount, so that the water-holding material has both high water-absorbing power and high light resistance, while the water-absorbing gel composition has both high water-holding capacity and high light resistance. A water-holding material comprising (A) carbon black self-dispersible in water and (B) a water-absorbing resin; and a water-absorbing gel composition comprising (A) carbon black self-dispersible in water, (B) a water-absorbing resin, and water.

Description

technical field [0001] The present invention relates to a water-retaining agent and water-absorbing gel composition excellent in light resistance. Background technique [0002] Water-retaining agents composed of water-absorbent resins have been used in various fields such as sanitary materials, farm and gardening, food distribution, civil engineering, cosmetics and toiletry, medical, power electronics, and paint adhesion , has become a necessity of life. [0003] As such water-absorbent resins, for example, neutralized products of starch-acrylonitrile graft polymers, saponified products of starch-acrylic acid graft polymers, saponified products of vinyl acetate-acrylate copolymers, and polyacrylic acid parts are known. Neutralized products, cross-linked bodies, etc. [0004] The water-absorbing gel of the conventional water-absorbing resin-based water-retaining agent described above has poor stability against sunlight and ultraviolet rays. That is, if the water-absorbing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00C08K9/04C08L101/14
CPCC08J3/075C08L101/14
Inventor 糟谷和宏铃木健太
Owner SANYO CHEM IND LTD
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