Water absorbent resin and method for producing same

一种吸水性、树脂的技术，应用在吸收垫、绷带、运输和包装等方向，能够解决粉末流动性和粒子强度减小等问题，达到高液体吸收性能、优异流动性、高形状保持性质的效果

Active Publication Date: 2015-03-11
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

Object The main object of the present invention is to provide a water-absorbent resin having a suitable particle size, strong particle strength, excellent adhesion to fibers, and excellent flowability as powders as well as properties suitable for a water-absorbent material used in a hygienic material, such as excellent general absorption properties as a water-absorbent resin, and to provide a process for producing the same. Another object of the present invention is to provide an absorbent material and an absorbent article using the water-absorbent resin. Means for Achieving the Object A water-absorbent resin having an aspect ratio of 1.0 to 3.0 and a median particle size (D) of 100 to 2,000 µm in which primary particles having an aspect ratio of 1.1 to 200 and a median particle size (d) of 50 to 600 µm are agglomerated.

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