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Water-absorbing agent and body liquid absorbing production

A technology of water-absorbing agent and water-absorbing resin, which is applied in various fields and can solve the problem that the water-absorbing performance of the resin cannot be fully displayed.

Inactive Publication Date: 2008-03-19
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has become increasingly apparent that problems still exist when the aforementioned known resins with various specific properties are used in these absorbent articles with high resin concentrations.
That is to say, by combining the above various properties, the water absorption performance of the absorbent article can be improved, but it is clear that there is still a problem in that, depending on the composition of the liquid to be adsorbed, the water absorption performance of the resin cannot be fully exhibited, especially when adsorbed When the resin concentration in the product is high
It is considered that there is a problem that when absorbent articles such as paper diapers are used, the composition of urine varies with various factors such as the user's age, food and drinks eaten, and medications taken, and thus the water-absorbent resin adsorption behavior will be very different from the expected effect

Method used

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  • Water-absorbing agent and body liquid absorbing production
  • Water-absorbing agent and body liquid absorbing production
  • Water-absorbing agent and body liquid absorbing production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0389] The reaction was prepared by dissolving 9.25 g of polyethylene glycol diacrylate (the average number of moles of added ethylene oxide was 8) in 5,500 g of an aqueous sodium acrylate solution (monomer concentration: 30 wt %) with a neutralization rate of 65 mol % solution. The solution was then degassed for 30 minutes under a nitrogen atmosphere before being introduced into a reactor, a covered stainless steel double-armed kneader with a volume of 10 liters and two sigma-shaped blades and a jacket. The reaction solution was kept at 30°C, and the air inside the system was replaced with nitrogen. Then, under the condition of stirring the reaction solution, 1.91 g of 2,2,-azobis(2-amidinopropane) dihydrochloride, 0.96 g of sodium persulfate and 0.10 g of L-ascorbic acid were added for about 1 minute. Then start the polymerization reaction. The polymerization reaction was carried out at a temperature of 30-80°C, and the obtained hydrogel polymer was taken out 60 minutes a...

Embodiment 2

[0393] A reaction solution was prepared by putting 720 g of acrylic acid, 3.08 g of N,N,-methylenebisacrylamide as an internal crosslinking agent, and 2,718 g of deionized water as a solvent into a reactor, and the reactor Is a covered stainless steel double-arm kneader with a volume of 10 liters, with two sigma-shaped blades and a jacket. The reaction solution was then maintained at 15°C, and the air inside the system was replaced with nitrogen. Then, while stirring the reaction solution, 21.6 g of 10 wt % 2,2,-azobis(2-amidinopropane) dihydrochloride aqueous solution, 18.0 g of 1 wt % L-ascorbic acid aqueous solution and 20.6 g of 3.5 -% aqueous hydrogen peroxide to initiate polymerization. Stirring was stopped at the same time the polymerization was initiated. The polymerization reaction was then allowed to proceed while, as the temperature of the reaction solution rose, the temperature of the jacket was appropriately raised so that the temperature of the reaction solutio...

Embodiment 3

[0401] By mixing 67.0 parts (weight) of 37 wt% sodium acrylate aqueous solution, 10.2 parts (weight) of acrylic acid, 0.097 parts (weight) of polyethylene glycol diacrylate (the average molar number of added ethylene oxide is 8) and 22.0 parts ( weight) water to obtain an aqueous monomer solution. Nitrogen gas was blown into the aqueous monomer solution in the reactor so that the concentration of dissolved oxygen in the solution was reduced to 0.1 ppm or less. Then, the temperature of the solution was adjusted to 18°C ​​under a nitrogen atmosphere. Then add dropwise 0.16 parts (weight) 5wt% sodium persulfate aqueous solution, 0.16 parts (weight) 5wt% 2,2,- azobis (2-amidino propane) hydrochloride aqueous solution, 0.15 parts (weight) 0.5 wt% ascorbic acid aqueous solution and 0.17 parts by weight of 0.35 wt% hydrogen peroxide aqueous solution.

[0402] After the hydrogen peroxide was added dropwise, the polymerization reaction started immediately, and after another 10 minute...

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Abstract

The present invention provides: a water-absorbing agent which has excellent urine resistance; a water-absorbing agent which has not only excellent urine resistance, but also excellent absorption properties that are stable to any composition of urine and show little change with time; and uses for these water-absorbing agents. The present invention water-absorbing agent exhibits a specific or larger value of absorption capacity under a load in a process in which the absorption capacity under a load is measured in a new manner using a specific liquid to be absorbed, and the present invention provides an absorbent matter which displays a specific or larger value of new absorption index as is, for example, led from the absorption capacity under a load or from the resin concentration using the above water-absorbing agent.

Description

[0001] This application is a divisional application of the application No. 99102593.8 filed on March 3, 1999, and the title of the invention is "water-absorbing agent and its manufacturing method and application". Background of the invention [0002] A.Technical field [0003] The present invention relates to a water-absorbing agent and its production method and application, more specifically the present invention relates to a water-absorbing agent with excellent urine resistance, especially for any liquid to be absorbed, such as urine A water-absorbing agent with excellent adsorption performance. The present invention also relates to a method for manufacturing a water-absorbing agent and the application of this water-absorbing agent, that is, as an absorbent material and an absorbent product. The present invention also relates to a method for measuring adsorption performance. Using this method, It is possible to easily and accurately predict the adsorption behavior of water-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L15/60B01J20/26C08J3/00
Inventor 和田克之植田裕子高桥直子长砂欣也三宅浩司藤田康弘初田卓己
Owner NIPPON SHOKUBAI CO LTD
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