Water-absorbable sheet structure

A water-absorbing sheet, water-absorbing technology, applied in the direction of absorbent pads, synthetic resin layered products, textiles, etc., can solve the problems of slow penetration of the absorber, reduced liquid diffusivity, gel blockage, etc., and achieve shape retention. Good, excellent creative appearance, no effect of back seepage and leakage

Active Publication Date: 2012-09-19
SUMITOMO SEIKA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering the liquid distribution or diffusion when actually used in absorbent articles such as sanitary napkins, if a large amount of water-absorbent resin forms a soft gel due to liquid absorption, it has the following disadvantages: the so-called "Gel clogging phenomenon", extremely reduced liquid diffusibility, and slowed liquid permeation rate of the absorbent body
[0014] In these methods, the synthetic fibrous base material enters the polymer particles and adheres firmly, but it has disadvantages such as difficulty in completing the polymerization reaction in the base material, increasing unreacted residual monomers, etc.

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment

[0085] The present invention will be described in further detail below according to the examples, but the present invention is not limited to the examples.

[0086] The performance of the water-absorbent resin and the water-absorbent sheet structure was measured and evaluated by the following methods.

[0087]

[0088] 2.0 g of the water-absorbent resin was weighed into a cotton bag (No. 60 men blue, width 100 mm×length 200 mm), and put into a 500-mL beaker. Inject 500 g of normal saline (0.9% by mass sodium chloride aqueous solution, the same below) into the cotton bag at one time to disperse the normal saline so that the water-absorbent resin does not agglomerate. Tie the upper part of the cotton bag tightly with a rubber ring and let it stand for 1 hour to fully swell the water-absorbent resin. The cotton bag was dehydrated for 1 minute using a dehydrator set at a centrifugal force of 167G (manufactured by Kokutoshinki Co., Ltd., model: H-122), and the mass Wa (g) of the...

manufacture example 1

[0149] (Manufacturing example 1: water absorbent resin A)

[0150]Prepare a round-bottomed cylindrical separable flask with an inner diameter of 100 mm. The flask is equipped with a reflux condenser, a dropping funnel, a nitrogen gas introduction tube, and a stirring blade as a stirrer. The stirring blade is divided into two stages and has 4 pieces with a blade diameter of 50 mm. Tilt the propellers. Take 500 mL of n-heptane in this flask, add 0.92 g of HLB3 sucrose stearate (manufactured by Mitsubishi Chemical Fursz Co., Ltd., Lyoto-Syuga-Ester S-370) as a surfactant, 0.92 g of maleic anhydride-modified An ethylene-propylene copolymer (HIWEX 1105A, manufactured by Mitsui Chemicals, Ltd.) was heated to 80°C to dissolve the surfactant, and then cooled to 50°C.

[0151] On the other hand, weigh 92 g of 80.5% by mass acrylic acid aqueous solution in a 500 mL Erlenmeyer flask, cool it externally, and simultaneously add 154.1 g of 20.0% by mass sodium hydroxide aqueous solution dr...

manufacture example 2

[0156] (Manufacturing example 2: water absorbent resin B)

[0157] In the above-mentioned Production Example 1, after the water was discharged out of the system by azeotropy, the amount of the 2% aqueous solution of ethylene glycol diglycidyl ether added was changed to 2.21 g. 1 In the same manner, 230.8 g of water-absorbent resin B in the form of aggregated spherical particles was obtained. The properties of the obtained water-absorbent resin B were: mass average particle diameter: 290 μm, water absorption speed of normal saline: 27 seconds, water retention capacity of normal saline: 51 g / g, water absorption capacity of normal saline under a load of 2.07 kPa: 20 mL / g.

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Abstract

Disclosed is a water-absorbable sheet structure in which a water-absorbing layer comprising a water-absorbable resin and an adhesive agent is sandwiched between non-woven fabrics from the top surface side and the lower surface side of the water-absorbing layer, wherein the content of the water-absorbable resin is not less than 10 g / m2 and less than 100 g / m2, the water-absorbable resin has a physiological saline retention of 35 to 80 g / g, and the water-absorbable sheet structure has peel strength of 0.05 to 3.0 N / 7 cm. The water-absorbable sheet structure can have good shape retention properties even when the water-absorbable sheet structure is thin, and therefore has such excellent effects that the water-absorbable sheet structure can keep the shape thereof well before and after the absorption of a liquid and can exhibit satisfactory absorption performance on liquids having low viscosities such as urine as well as liquids having high viscosities such as menstrual blood.

Description

technical field [0001] The present invention relates to a water-absorbent sheet structure usable in the hygienic material field and the like. Specifically, it relates to a thin water-absorbent sheet structure that can be suitably used for absorbent articles such as sanitary napkins. The present invention further relates to absorbent articles such as sanitary napkins produced using the water-absorbent sheet structure. Background technique [0002] Absorbent articles represented by sanitary napkins, incontinence pads, etc. have a structure in which an absorbent body for absorbing liquids such as body fluids is arranged on a soft liquid-permeable surface sheet (top sheet) on the side in contact with the body. , and a liquid-impermeable bottom sheet (backsheet) disposed on the side opposite to the body-contacting side. [0003] Conventionally, there has been an increasing demand for thinner and lighter absorbent articles from the viewpoints of designability, convenience at the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F13/15A61F13/49A61F13/53B32B27/00B32B27/12
CPCB32B5/26A61F2013/530569B32B5/22A61F13/53A61F2013/530708A61F2013/5307A61F2013/530481B32B5/30Y10T442/671Y10T442/659A61F13/534A61F13/535
Inventor 松下英树鄙山铁博圆尾淳一半田昌良
Owner SUMITOMO SEIKA CHEM CO LTD
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