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Water absorbent and preparation method

A water-absorbing agent and water-absorbing technology, used in absorbent pads, medical science, bandages, etc., can solve the problems of low reactivity, coloring of water-absorbing resin, and complicated operation.

Inactive Publication Date: 2002-05-22
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, in order to reduce the remaining amount, there is also the problem of complicated operations
In addition, cross-linking agents such as polyols with high safety are required to carry out the cross-linking reaction at high temperature for a long time due to their low reactivity, but sometimes the water-absorbent resin may be colored or deteriorated due to heating.

Method used

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  • Water absorbent and preparation method

Examples

Experimental program
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Effect test

reference example 1

[0117] Aqueous solution of sodium acrylate having a neutralization rate of 75 mol % was placed in a reactor formed by installing a cover on a jacketed stainless steel twin-column kneader with 2 Σ-shaped blades and an internal volume of 10 liters. A reaction liquid obtained by dissolving 3.70 g of polyethylene dipropionate (n=9) in 5500 g (monomer concentration: 38% by weight). The reaction solution was then degassed for 30 minutes under nitrogen atmosphere. Next, 2.7 g of ammonium sulfate and 0.02 g of L-ascorbic acid were added to the reaction liquid with stirring, and polymerization started about 1 minute later. Polymerization was carried out at 20 to 90°C while pulverizing the generated gel, and the hydrogel-like crosslinked polymer (1) was taken out 30 minutes after the start of polymerization.

[0118] After the obtained hydrogel-like cross-linked polymer (1) is finely pulverized to a diameter of about 5 mm or less, the finely pulverized hydro-gel-like cross-linked polym...

Embodiment 1

[0121] Into 100 g of the water-absorbent resin (A) obtained in Reference Example 1, dropwise mix a surface mixture consisting of 1.0 g of 3-methyl-3-oxetanemethanol, 3.0 g of ion-exchanged water, and 3.0 g of isopropanol. After treating the agent, it was left to stand in a hot air drier at 170° C. for 1 hour to obtain a water absorbing agent (1). Table 1 shows the results of measurement of the obtained water-absorbing agent (1) in terms of non-pressurized water absorption capacity, water absorption capacity under a pressure of 2.07 KPa, and fluidity in a hygroscopic state (the same applies hereinafter).

Embodiment 2

[0123] In 100 g of the water-absorbent resin (A) obtained in Reference Example 1, a surface treatment agent consisting of a mixture of 1.16 g of 3-ethyl-3-oxetanemethanol, 6.0 g of water, and 3.0 g of isopropyl alcohol was added dropwise and mixed After that, it was left to stand in a hot air dryer at 170° C. for 1 hour to obtain a water-absorbing agent (2). Table 1 shows the measured physical properties of the obtained water absorbing agent (2).

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Abstract

The present invention provides a process for producing a water-absorbing agent at low temperature in a short time, wherein the water-absorbing agent has excellent balance between the absorption capacity without load and the absorption capacity under a load, high fluidity under a hygroscopic atmosphere, and excellent safety; and a novel water-absorbing agent and a novel crosslinking agent particularly suitable for crosslinking water-absorbent resins. The water-absorbing agent, having excellent balance between the absorption capacity without load and the absorption capacity under a load, high fluidity under a hygroscopic atmosphere, and excellent safety, can be obtained by using an oxetane compound and / or an imidazolidinone compound for a water-absorbent resin.

Description

technical field [0001] The present invention is related to the preparation method of the water-absorbing agent and the water-absorbing agent. Background technique [0002] In recent years, absorbent articles such as disposable diapers, sanitary napkins, and so-called incontinence pads have widely used water-absorbent resins (water-absorbing agents) as their constituent materials for the purpose of absorbing body fluids. [0003] Such water-absorbent resins (also referred to as superabsorbent resins and water-absorbent polymers) are well known, for example, as described in Japanese Industrial Standards (JIS) K7223-1996. [0004] The above-mentioned water-absorbent resins are known, for example, polyacrylic acid partially neutralized cross-linked product, starch-acrylic acid graft polymer hydrolysis product, vinyl acetate-acrylate copolymer basified product, acrylonitrile copolymer or acrylamide Hydrolyzed products of copolymers or their cross-linked products, cross-linked pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08K5/1535C08K5/353
CPCC08K5/1535C08K5/353C08J3/245C08J2300/14
Inventor 池内博之原田信幸增田善彦
Owner NIPPON SHOKUBAI CO LTD
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