Particulate water-absorbing agent and process for producing same

A manufacturing method and water-absorbing agent technology, applied in particle suspension analysis, chemical instruments and methods, absorbent pads, etc., can solve problems such as unaware of long-term maintenance effects, and achieve superior absorption characteristics and superior absorption performance

Active Publication Date: 2015-04-29
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they did not realize the issue of how to maintain the effect for a long time
[0017] In addition, since the above-mentioned polymerization inhibitor is contained in the monomer, it exists uniformly inside the water-absorbing resin after polymerization. Therefore, no one knows what happens when the polymerization inhibitor partially exists on the surface of the particulate water-absorbing agent. Effect etc.

Method used

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  • Particulate water-absorbing agent and process for producing same
  • Particulate water-absorbing agent and process for producing same
  • Particulate water-absorbing agent and process for producing same

Examples

Experimental program
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Embodiment

[0302] 〔5〕Example

[0303] Hereinafter, the present invention will be specifically described by way of examples and comparative examples. The electrical equipment used in the Examples and Comparative Examples were all used under the conditions of 100V and 60Hz. In addition, unless otherwise specified, all physical properties were measured under the conditions of room temperature (23°C±2°C) and relative humidity of 50%RH.

[0304] In addition, for convenience, "mass%" may be written as "wt%" and "liter" may be written as "L". In addition, in this specification, "0.90 mass % sodium chloride aqueous solution" may be referred to as "physiological saline", but both are the same substance. In addition, in the following columns (5-1) to (5-13), "particulate water-absorbing agent" is written for convenience, but when measuring "water-absorbent resin particles" or "water-absorbent resin", etc. It is called "granular water absorbent".

[0305] (5-1) Water absorption capacity without...

manufacture example 1

[0384] A cover was attached to a double-arm type stainless steel kneader with two sigma-type stirring blades and a casing with an inner volume of 10 L to prepare a reactor, and 425.2 g of acrylic acid and a 37% by mass sodium acrylate aqueous solution were charged into the reactor. 4499.5g, 538.5g of pure water, 6.17g of polyethylene glycol diacrylate (molecular weight 523), and 0.21g of trisodium diethylenetriaminepentaacetate, thereby obtaining a reaction solution, and then carried out in a nitrogen atmosphere for 20 minutes outgassing.

[0385] Next, while stirring the reaction solution, 28.3 g of a 10% by mass sodium persulfate aqueous solution and 23.6 g of a 0.1% by mass L-ascorbic acid aqueous solution were added individually, and polymerization started about 25 seconds later. Next, while performing polymerization at 25 to 95° C., the generated hydrogel-like crosslinked polymer was ground, and 30 minutes after the start of polymerization, the hydrogel-like crosslinked p...

manufacture example 2

[0388] Change the consumption of the polyethylene glycol diacrylate (molecular weight 523) in manufacture example 1 to 4.93g, except that, all carried out the same operation with manufacture example 1, obtain weight-average particle diameter (D50) be 380 μ m . Randomly crushed water absorbent resin particles (2) having a logarithmic standard deviation (σζ) of particle size distribution of 0.33. The obtained water-absorbent resin particles (2) had a water absorption capacity under no pressure (CRC) of 45 [g / g] and a water-soluble content (Ext) of 15% by mass.

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Abstract

Provided at low cost is a water-absorbing agent which has been reduced in dust generation and in increase of dust amount with the lapse of time and which is high in non-pressure absorption ratio, under-pressure absorption performance, under-pressure vertical diffusion absorption, and short-time absorption. Also provided is a method for evaluating, in a short time, the increase of dust amount with the lapse of time. The particulate water-absorbing agent according to the present invention is a particulate water-absorbing agent which comprises a surface-crosslinked polyacrylic acid (salt)-based water-absorbing resin as the main component, and contains a hydrophilic polymer and a stabilizer.

Description

technical field [0001] The present invention relates to a granular water-absorbing agent and a manufacturing method thereof. More specifically, the present invention relates to a particulate water-absorbing agent having a specific water-absorbing performance and a method for producing the same, comprising a polyacrylic acid (salt)-based water-absorbing resin as a main component. Background technique [0002] Currently, water-absorbing agents mainly composed of water-absorbent resins are widely used as constituent materials of absorbent products such as disposable diapers, sanitary napkins, and incontinence pads together with hydrophilic fibers such as pulp. [0003] Regarding the absorption performance required for the above-mentioned water-absorbent resin, there are known water absorption capacity under pressure, water absorption capacity under pressure, permeability, water absorption speed, soluble water component ratio, gel strength, and the like. So far, many patent app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C08J3/12C08J3/24C08K5/00C08L33/02G01N33/44
CPCA61L15/24A61L15/42A61L15/60A61L26/0014A61L26/0061A61L26/008B01J20/223B01J20/267C08J3/245C08L33/02B01J2220/445C08J2333/02C08K5/005Y02W10/37A61L15/225A61L15/48C08K3/011C08K5/13C08L33/04C02F1/285G01N15/06
Inventor 中岛康久和田克之池内博之植田学
Owner NIPPON SHOKUBAI CO LTD
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