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

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

Inactive Publication Date: 2010-11-10
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

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-dispersing properties in water was added to prepare a carbon black dispersion. Then, while stirring the carbon black dispersion (2000 rpm), 10 parts by weight of a water-absorbent resin (a water-absorbent resin composed of a cross-linked polymer of a sodium acrylate salt and having a water absorption capacity of 400 g / g of ion-exchanged water) was added. (For example, Sunfresh (サンフレツシyu) (registered trademark) GT-1) manufactured by Sanyo Chemical Industry Co., Ltd. (Sanyo Chemical Industry Co., Ltd.)), a water-absorbing gel composition was prepared. The obtained water-absorbent gel composition was put into 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)

[00...

manufacture example 1

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

[0129] After the reaction is completed, the oxidized carbon black and the reaction solution are filtered and separated, and the oxidized carbon black with a concentration of 1.0 mol / dm 3 neutralized with an aqueous sodium hydroxide solution. After neutralization, a centrifugal separator (manufactured by Hitachi Koki (Hitachi Koki), CR22F) was used at 7.5×10 -3 S -1 , 15 minutes for classification treatment. Then, the supernatant was separated from the remaining salt with an ...

manufacture example 2

[0131] A carbon black dispersion liquid (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 liquid (A2) at 25°C (after standing at 70°C for 1 week) was 4.93 mPa·s, and the carbon black (a2) in (A2) already had self-dispersion performance. The light-shielding ratio of (a2) was 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 a water-absorbing gel composition with excellent light resistance. Background technique [0002] Water-retaining agents composed of water-absorbing resins have been used in various fields such as sanitary materials, farm and horticulture, food distribution, civil engineering and construction, cosmetics and cosmetic appliances, medical care, power electronics, and paint adhesion. , has become a necessities 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 parts of polyacrylic acid are known. Neutralization product cross-linked body, etc. [0004] In the water-retaining agent composed of the conventional water-absorbent resin as described above, the water-absorbent gel has poor stability against sunli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00C08K9/04C08L101/14
CPCC08L101/14C08J3/075
Inventor 糟谷和宏铃木健太
Owner SANYO CHEM IND LTD
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