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Process for production of water-absorbable resin particle, and water-absorbable resin particle produced by the process

一种树脂粒子、吸水性的技术，应用在吸水性树脂粒子的制备领域，能够解决不能充分满足吸水容量等问题，达到优良吸水容量、窄粒度分布、高粒子强度的效果

Active Publication Date: 2009-06-24
SUMITOMO SEIKA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, although water-absorbent resins with large particle sizes can be obtained by these techniques, they cannot sufficiently satisfy the requirements for proper particle size, narrow particle size distribution, high particle strength, and excellent water-absorbing capacity under pressure.

Method used

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  • Process for production of water-absorbable resin particle, and water-absorbable resin particle produced by the process
  • Process for production of water-absorbable resin particle, and water-absorbable resin particle produced by the process
  • Process for production of water-absorbable resin particle, and water-absorbable resin particle produced by the process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Prepare a cylindrical type with an inner diameter of 100 mm equipped with a reflux condenser, a dropping funnel, a nitrogen gas introduction pipe, and a stirring paddle (a two-stage four-pitched paddle blade with a blade diameter of 50 mm) as a stirrer. Round bottom detachable flask. Add 500 ml of n-heptane, 0.92 g of sucrose stearate (Mitsubishi Chemical F-Z (KK), Ryoto sucrose ester S-370) of HLB 3, and maleic anhydride-modified ethylene-propylene copolymer ( Mitsui Chemicals Co., Ltd., Hi-wax 1105A) 0.92 g, heated up to 80° C. to dissolve the dispersion stabilizer, and then cooled to 50° C.

[0071] On the other hand, 92 g of an 80.5% by mass acrylic acid aqueous solution was added to a 500 ml Erlenmeyer flask, and while cooling from the outside, 154.1 g of a 20.0% by mass sodium hydroxide aqueous solution was added dropwise to neutralize 75% by mole of acrylic acid, and the persulfuric acid 0.11 g of potassium and 9.2 mg of N,N'-methylenebisacrylamide were added an...

Embodiment 2

[0078] 278.8 g of water-absorbent resin particles in the form of agglomerated spherical particles were obtained in the same manner as in Example 1, except that the composition of the monomer aqueous solution in the second-stage polymerization in Example 1 was changed to 80.5% by mass. 174.8 g of acrylic acid aqueous solution, 237.4 g of 24.7% by mass sodium hydroxide aqueous solution, 0.21 g of potassium persulfate, and 17.5 mg of N,N'-methylenebisacrylamide were further dehydrated by n-heptane reflux after the second-stage polymerization. The amount was 313.9 g, and the amount of a 2% aqueous solution of ethylene glycol diglycidyl ether after dehydration was 10.7 g. The median diameter of the secondary particles was 468 μm, and the water content was 5.6%. Table 1 shows the measurement results of each property.

Embodiment 3

[0080] Prepare a detachable cylindrical type with an inner diameter of 100mm equipped with a reflux condenser, a dropping funnel, a nitrogen gas introduction pipe, and a stirring paddle (two-stage 4-blade flat paddle with a paddle diameter of 50mm) as a stirrer. flask. Add 500 ml of n-heptane, 0.92 g of sucrose stearate of HLB 3 (Mitsubishi Chemical F-Z (KK), Ryoto sucrose ester S-370), maleic anhydride modified ethylene-propylene copolymer ( Mitsui Chemicals Co., Ltd., Hi-wax 1105A) 0.92g, heated up to 80°C to dissolve the dispersion stabilizer, and then cooled to 50°C.

[0081] On the other hand, 92 g of an 80.5% by mass acrylic acid aqueous solution was added to a 500 ml Erlenmeyer flask, and while cooling from the outside, 154.1 g of a 20.0% by mass sodium hydroxide aqueous solution was added dropwise to neutralize 75% by mole of acrylic acid, and the persulfuric acid 0.11 g of potassium and 9.2 mg of N,N'-methylenebisacrylamide were added and dissolved to prepare the fir...

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Abstract

Disclosed is a process for production of a water-absorbable resin particle, which comprises the following steps (1) to (3): (1) performing the first stage of the reverse phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a petroleum hydrocarbon solvent in the presence of a dispersion stabilizer to yield a spherical primary particle having a median particle diameter (d) of 30 to 130 [mu]m; (2) cooling the polymerization reaction solution to cause the precipitation of the dispersion stabilizer; and (3) adding a second-stage water-soluble ethylenically unsaturated monomer to the polymerization reaction solution and performing the second stage of the reverse phase suspension polymerization to cause the aggregation of the primary particle, thereby forming a secondary particle having a median particle diameter (D) of 200 to 500 [mu]m, wherein the median particle diameter (d) of the primary particle and the median particle diameter (D) of the secondary particle has the relationship shown by the following formula: 5d / 3+150 < D < 5d+150.

Description

technical field [0001] The present invention relates to a method for preparing water-absorbent resin particles. Specifically, it relates to a method for producing water-absorbent resin particles having properties such as suitable particle size, narrow particle size distribution, high particle strength, excellent water absorption capacity under pressure, etc. as a water-absorbing agent applicable to hygienic materials and by the method The obtained water-absorbent resin particles. technical background [0002] In recent years, water-absorbent resins have been widely used in sanitary products (disposable diapers, sanitary products, etc.); agricultural and gardening materials such as water-retaining agents and soil improvement materials; kind of field. In these fields, the resin is particularly commonly used for sanitary materials of disposable diapers, sanitary products, and the like. [0003] As water-absorbent resins, known are, for example, hydrolyzed products of starch-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/18C08F20/06B01J20/26
CPCC08F222/385C08F220/06C08F2/32C08F291/00B01J20/267Y10T428/2982
Inventor 半田昌良绳田康博
Owner SUMITOMO SEIKA CHEM CO LTD
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