Absorbent sheet and method for producing same

A manufacturing method and absorbent sheet technology, which can be applied to absorbent pads, non-woven fabrics, textiles, and papermaking, and can solve problems such as poor productivity, difficulty in constantly exerting the performance of absorbent resins, and poor operability

Inactive Publication Date: 2014-10-01
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the absorbent resin is usually fine powder, there is a disadvantage of poor handling. In the field of sanitary materials such as disposable diapers, it is loaded into pulp and used in bags.
In this method, not only the thickness of the absorber becomes thicker, but also the inside of the bag is shifted, so there is a problem that it is difficult to maintain the performance of the absorbent resin.
Furthermore, there is a problem of poor productivity

Method used

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  • Absorbent sheet and method for producing same
  • Absorbent sheet and method for producing same
  • Absorbent sheet and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0281] Concrete examples and comparative examples of the present invention are shown below, but the present invention is not limited to the following examples.

[0282] (1) Determination of water absorption capacity of resin without pressure; Tea-bag (tea bag) method

[0283] Absorbent resin A (g) (about 0.5 g) was evenly placed in a tea bag (7×9 cm) made of nonwoven fabric, and immersed in 500 cc of physiological saline at a liquid temperature of 25° C. for 1 hour. After the specified time, pull up the tea bag, and after 10 minutes of natural water control, measure the weight B (g) of the tea bag. The same operation was performed with only the tea bag without adding the absorbent resin, and the measured weight C (g) was set as a blank. From these values, the water absorption capacity was obtained by the following formula.

[0284] Water absorption ratio (g / g)=(B(g)-C(g)) / A(g)

[0285] (2) Determination of the absorption rate of the resin; Vortex Method

[0286] 50 g of 0....

manufacture example 1

[0350] [Production Example 1] (Preparation of ammonium acrylate by neutralization of acrylic acid)

[0351] As the acrylic acid, a reagent special grade product manufactured by Wako Pure Chemical Industries, Ltd. was used. Acrylic acid is distilled before use to remove the polymerization inhibitor before use. Next, 100 kg of acrylic acid was dissolved in 91.02 kg of water. While cooling this aqueous solution with an ice bath so as to keep the liquid temperature at 30° C. or lower, 117.94 kg of a 25% by mass ammonia solution was gradually added with stirring to obtain a 40% by mass ammonium acrylate aqueous solution.

manufacture example 2

[0352] [Production Example 2] (Preparation of sodium acrylate by neutralization of acrylic acid)

[0353] As the acrylic acid, a reagent special grade product manufactured by Wako Pure Chemical Industries, Ltd. was used. Acrylic acid is distilled before use to remove the polymerization inhibitor before use. Next, 100 kg of acrylic acid was dissolved in 43.2 kg of water. While cooling this aqueous solution with an ice bath so as to keep the liquid temperature at 30° C. or lower, 166.7 kg of a 25 mass % sodium hydroxide aqueous solution was gradually added with stirring to obtain a 40 mass % 75 mol % neutralized sodium acrylate aqueous solution.

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PUM

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Abstract

Disclosed is a method that is for producing an absorbent sheet containing absorbent resin, hydrophilic fibers, and hydrophobic fibers, and that is provided with: a dehydration step for causing dehydration in the state of the abovementioned absorbent resin and the abovementioned hydrophilic fibers being in contact and containing water, resulting in a composite composition; and a sheet-forming step for heating while in the state of the abovementioned composite composition and the abovementioned hydrophobic fibers being in contact, forming a sheet shape.

Description

[0001] This application is a divisional application. The original Chinese national application number is 201180037857.5, the filing date is June 14, 2011, and the title of the invention is "absorbent sheet and its manufacturing method". technical field [0002] The present invention relates to an absorbent sheet and its manufacturing method. Background technique [0003] In recent years, absorbent resins that absorb a large amount of water and gel have been developed, and are used mainly in the field of sanitary materials such as disposable diapers and menstrual tampons. Since absorbent resins are usually fine powders, they have a disadvantage of poor handling, and in the field of hygiene materials such as disposable diapers, they are carried in pulp or the like and put into bags for use. In this method, not only the thickness of the absorber becomes thicker, but also deviation occurs inside the bag, so there is a problem that it is difficult to constantly exhibit the perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F13/53
CPCA61F13/15617A61L15/60D04H1/407A61F2013/530255A61F2013/53024A61F13/53A61F2013/530299Y10T156/10Y10T428/31786A61L15/22B01J20/28035B01J20/28033
Inventor 秋山努冈本裕重石川善将
Owner ASAHI KASEI CHEM CORP
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