Water absorbent resin and method for producing same

A water-absorbent, resin-based technology, applied in absorbent pads, bandages, transportation and packaging, etc., can solve the problems of powder fluidity and particle strength reduction, and achieve high liquid absorption performance, excellent fluidity, and high shape retention properties Effect

Active Publication Date: 2013-05-01
SUMITOMO SEIKA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the particle length / particle width ratio of the water-absorbent resin is increased and the water-absorbent resin has an elongated shape, adhesion to fibers can be improved; however, powder fluidity and particle strength tend to decrease
Therefore, these methods are not suitable for making thin absorbent materials

Method used

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  • Water absorbent resin and method for producing same
  • Water absorbent resin and method for producing same
  • Water absorbent resin and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] Provided with an inner diameter of 100mm, equipped with a reflux condenser, a dropping funnel, a nitrogen gas introduction pipe, and a stirring paddle with 2 sets of 4 inclined-blade flat paddles (paddle diameter: 50 mm) as a stirrer, a detachable round bottom cylinder flask. 500 ml of n-heptane was charged in the flask, and 0.92 g of sucrose stearate having an HLB of 3 (manufactured by Mitsubishi-Kagaku Foods Corporation, Ryoto sugar ester S-370) was added thereto and 0.92 g of a maleic anhydride-modified ethylene-propylene copolymer (manufactured by Mitsui Chemicals, Ltd., Hi-wax 1105A). The temperature was raised to 80°C to dissolve the surfactant, and thereafter the solution was cooled to 50°C.

[0138] Separately, 92 g of an aqueous acrylic acid solution (80.5% by mass) was charged in an Erlenmeyer flask (500 ml capacity), and 167.7 g of an aqueous sodium hydroxide solution (18.4% by mass) was added dropwise thereto under external cooling to neutralize 75 mol%. T...

Embodiment 2

[0144] The same procedure as in Example 1 was repeated, except that the stirring speed for the first-stage polymerization was changed to 400 rpm, and 2% of the ethylene glycol diglycidyl ether added after azeotropic dehydration was The amount of the aqueous solution was changed to 11.13 g, thereby obtaining 213.1 g of a water-absorbent resin having a form of secondary particles in which ellipsoidal primary particles were aggregated (it should be noted that when an oil bath at 120° C. When azeotropic distillation of water and n-heptane was performed to distill only water out of the system and then dried by n-heptane evaporation, the resulting ellipsoidal primary particles had a median particle size of 280 μm and an aspect ratio of 1.4). The obtained water-absorbent resin had a median particle size of 720 μm and a water content of 7%. Table 1 shows the measurement results of each property.

Embodiment 3

[0146] The same procedure as in Example 1 was repeated, except that the stirring speed for the first-stage polymerization was changed to 700 rpm, and 2% of the ethylene glycol diglycidyl ether added after azeotropic dehydration was The amount of the aqueous solution was changed to 6.07 g, thereby obtaining 214.0 g of a water-absorbent resin having a form of secondary particles in which ellipsoidal primary particles were aggregated (it should be noted that when an oil bath at 120° C. When azeotropic distillation of water and n-heptane was performed to distill only water out of the system and then dried by n-heptane evaporation, the resulting ellipsoidal primary particles had a median particle size of 110 μm and an aspect ratio of 1.6). The obtained water-absorbent resin had a median particle size of 470 μm and a water content of 7%. Table 1 shows the measurement results of each property.

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Abstract

The main objective of the present invention is to provide: a water absorbent resin having excellent general absorption performance as a water absorbent resin, an adequate particle size and a high particle strength as well as having excellent fiber tenacity and high fluidity as a powder, as properties suitable for a water absorbent for use in a hygienic material; and a method for producing the same. The objective of the present invention is also to provide an absorber and an absorbent article using the water absorbent resin. The water absorbent resin is in a form with an aspect ratio of 1.0 to 3.0 and a median particle size (D) of 100 to 2,000 [mu]m, in which first particles with an aspect ratio of 1.1 to 200 and a median particle size (d) of 50 to 600[mu]m are aggregated.

Description

technical field [0001] The present invention relates to a water-absorbent resin. Specifically, the present invention relates to a water-absorbent resin having properties suitable for a water-absorbing agent used in hygienic materials, such as suitable particle size, strong particle strength, excellent absorption performance, excellent adhesion to fibers and excellent fluidity as a powder. The present invention also relates to absorbent materials using the water-absorbent resin and absorbent articles such as paper diapers. technical background [0002] In recent years, water-absorbent resins have been widely used in various products including sanitary products such as paper diapers and sanitary napkins, agricultural and gardening materials such as water-retaining materials and soil conditioners, and industrial materials such as water-stopping agents and agents for preventing dew condensation. in the field. Among them, water-absorbent resins are particularly frequently used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/20A61F13/53A61L15/60C08F20/06
CPCC08F2/32B01J20/28016C08F20/06A61F13/53A61F2013/530481A61L15/22A61L15/60Y10T428/2982C08F2/20
Inventor 半田昌良小野田裕一上田耕士
Owner SUMITOMO SEIKA CHEM CO LTD
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