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Process for production of water-absorbing resin particles, water-absorbing resin particles, water-stopping material, and absorbent article

A technology of resin particles and a manufacturing method is applied in the fields of the manufacture of water-absorbent resin particles, water-absorbent resin particles, water-stopping materials and absorbent articles, and can solve the problem of not obtaining water-absorbent resin particles and the like.

Active Publication Date: 2012-08-22
SUMITOMO SEIKA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with these methods, water-absorbent resin particles having the swelling performance required in the use of water-stopping materials have not been obtained.

Method used

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  • Process for production of water-absorbing resin particles, water-absorbing resin particles, water-stopping material, and absorbent article
  • Process for production of water-absorbing resin particles, water-absorbing resin particles, water-stopping material, and absorbent article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Prepare a round-bottom cylindrical type detachable flask with an inner diameter of 100 mm, which has a reflux cooler, a dropping funnel, a nitrogen gas introduction tube, a stirring paddle (coated with a fluororesin on the surface) as a stirrer, and the stirring paddle is divided into The two sections have 4 oblique-bladed flat paddles with a paddle diameter of 50mm. 550 mL of n-heptane was added to the flask, and 0.84 g of sorbitan monolaurate (manufactured by NOF Corporation, Nonion LP-20R) of HLB8.6 was added as a surfactant, and the temperature was raised to 50° C. to make the surfactant After dissolving, cool to 40°C.

[0105] On the other hand, 70 g (0.783 mol) of an 80.5 mass % acrylic acid aqueous solution was added to a 500 mL Erlenmeyer flask, and 112.3 g of a 20.9 mass % sodium hydroxide aqueous solution was added dropwise while ice-cooling to neutralize 75 mol %. 0.084 g of potassium persulfate was added and dissolved to prepare an aqueous monomer solution....

Embodiment 2～4

[0110] In Example 1, the amount of water discharged out of the system in one drying step was 74.9 g, 64.5 g, and 81.8 g, respectively, and the amount of 2% aqueous solution of ethylene glycol diglycidyl ether was 1.05 g (0.00012 mol) , 0.7g (0.00008 mol), 1.75g ​​(0.0002 mol), so that the moisture content (to polymer solid content) is 57 mass%, 71 mass%, 48 mass% respectively, except that, carry out the same procedure as in Example 1 By operation, 72.8 g, 72.7 g, and 73.1 g of granular water-absorbent resin particles were obtained, respectively.

Embodiment 5

[0112] In Example 1, the amount of water discharged out of the system in one drying step was 81.8 g, and 2.47 g (0.00019 mol) of a 2% aqueous solution of polyglycerol glycidyl ether was added without adding ethylene glycol diglycidyl ether, so that Except that the water content (with respect to the polymer solid content) was 49% by mass, the same operation as in Example 1 was carried out to obtain 72.4 g of granular water-absorbent resin particles.

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Abstract

Provided are: a process for the production of water-absorbing resin particles which exhibit high equilibrium swelling performance and combine a high speed of water absorption and speedy initial swelling performance and which have moderate particle diameters and exhibit excellent handleability; water-absorbing resin particles obtained by the process; and a water-stopping material and an absorbent article which are made using the water-absorbing resin particles. The process comprises a step of preparing a hydrous gel-like polymer by conducting the inverse suspension polymerization of a water-soluble ethylenically unsaturated monomer in a hydrocarbon solvent in the absence of an internal crosslinking agent in the presence of a surfactant having an HLB of 8 to 12, and a step of adjusting the water content of the hydrous gel-like polymer to 30 to 110% by mass relative to the water-soluble ethylenically unsaturated monomer constituting the hydrous gel-like polymer, and then subjecting the resulting hydrous gel-like polymer to post-crosslinking.

Description

【Technical field】 [0001] The present invention relates to a method for producing water-absorbent resin particles, water-absorbent resin particles obtained therefrom, a water-stop material, and an absorbent article. More specifically, the present invention relates to a production method for obtaining the following water-absorbent resin particles through specific production conditions, a water-absorbent resin particle excellent in water-stop performance obtained therefrom, and a water-stop material using the water-absorbent resin particles And absorbent articles, the water-absorbent resin has high balanced swelling performance and rapid initial swelling performance or excellent water absorption speed, and has an appropriate particle size and excellent handleability. 【Background technique】 [0002] In recent years, water-absorbent resin particles have been widely used in sanitary materials such as paper diapers and sanitary products; agricultural and gardening materials such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/00A61F13/49A61F13/53A61L15/60C08F20/00C08J3/24
CPCA61F13/15658A61F13/53C08F2/14C08F2/32C08F6/008C08F8/14C08F2800/10C08F2810/20C08J3/245C08J2333/02Y10T428/273Y10T428/31855C08F220/04A61F13/49A61L15/60C08F2/18C08F8/00C08J3/24
Inventor 菊野佐知平郡笃半田昌良前田畅浩
Owner SUMITOMO SEIKA CHEM CO LTD
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