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Manufacturing method for polyacrylic acid (salt) -based water-absorbent resin powder

一种制造方法、树脂粉末的技术，应用在涂层等方向，能够解决吸水速度和通液性困难、吸水速度、通液性变大等问题，达到操作性和混合比率的稳定性优异、保存稳定性提高、降低残留副产物的效果

Active Publication Date: 2013-12-18
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Furthermore, in terms of improving and stabilizing physical properties, the problems of water absorption speed and liquid permeability become larger. In particular, as the production scale of water-absorbent resins increases, the reality is to maintain and improve water absorption speed, or to combine water absorption speed and fluid permeability become more difficult

Method used

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  • Manufacturing method for polyacrylic acid (salt) -based water-absorbent resin powder
  • Manufacturing method for polyacrylic acid (salt) -based water-absorbent resin powder
  • Manufacturing method for polyacrylic acid (salt) -based water-absorbent resin powder

Examples

Experimental program
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Effect test

manufacture example 1

[0762] As a continuous production device (capacity 1500 [kg / hr]) of water-absorbent resin powder, prepared from the polymerization process, gel pulverization process, drying process, pulverization process, classification process, surface crosslinking process (spraying process, heat treatment process) , cooling process), sizing process, and a device that connects the conveying process between the various processes. The continuous production apparatus was operated under the operating conditions of each process described below, and the continuous production of the water-absorbent resin powder was started. In addition, in the manufacture example 1, the manufacture of the water-absorbent resin particle (a) before surface crosslinking is demonstrated.

[0763] First, as a polymerization step, 0.09 mol% (relative to the monomer) of acrylic acid as an internal crosslinking agent was added to an acrylic acid partially neutralized sodium salt aqueous solution (monomer concentration: 38%...

manufacture example 2

[0768] In the same manner as in Production Example 1, as a continuous production apparatus (capacity 1500 [kg / hr]) of water-absorbent resin powder, a polymerization process, a gel pulverization process, a drying process, a pulverization process, a classification process, and a surface crosslinking process were prepared. (spraying process, heat treatment process, cooling process), sizing process, and a conveying process that connects each process. The continuous production apparatus was operated under the operating conditions of each process described below, and the continuous production of the water-absorbent resin powder was started. In addition, in the manufacture example 2, the manufacture of the water-absorbent resin particle (b) before surface crosslinking is demonstrated.

[0769] In Production Example 2, the same operations as in Production Example 1 were performed except that the conditions shown below were changed. That is, the amount of polyethylene glycol diacrylat...

Embodiment 1

[0771] (melting and storage of ethylene carbonate)

[0772] As a melting device for ethylene carbonate, a double-arm type kneader with an internal volume of 500 L including a jacket through which a heating medium could flow and a scraper stirring shaft was prepared.

[0773] After putting 300 kg of ethylene carbonate in the form of a solid sheet (a few mm on one side) into the double-arm kneader, pass warm water at 80°C through the jacket and the scraper stirring shaft, and rotate the scraper stirring blade at 10 rpm to start solid-state kneading. Melting of ethylene carbonate.

[0774] Stirring was stopped when the temperature of molten ethylene carbonate reached 50° C., and it was transported and stored in an intermediate tank (raw material tank) in a molten (heated) state. This transportation was carried out using a transportation pipe and a pump that were heat-retained with warm water at 50°C. It should be noted that a filter is provided before the pump. In addition, th...

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Abstract

[Problem] To reduce the amount of ethylene glycol which is produced as a by-product, to achieve a balance between productivity and properties such as water absorbency, and to reduce the number of defective goods when manufacturing a water-absorbent resin, particularly a resin which is surface crosslinked using an alkylene carbonate compound. [Solution] A manufacturing method for a polyacrylic acid (salt)-based water-absorbent resin powder, said method being characterised in that in the surface crosslinking step, a mixing process in which (1) a surface crosslinking agent containing an alkylene carbonate compound and a polyhydric alcohol compound is mixed with a water absorbent resin powder and thermally reacted, and an ionic reactive surface crosslinking agent is mixed with said mixture at either the same time, or separately from the above mixing, and / or (2) a surface crosslinking solution containing at least one kind of ionic reactive surface crosslinking agent is mixed with the water-absorbent resin powder, said mixing process being carried out at least two times.

Description

technical field [0001] The present invention relates to a method for producing polyacrylic acid (salt)-based water-absorbent resin powder. More specifically, it relates to a polyacrylic acid (salt)-based water-absorbent resin powder having few remaining raw materials (particularly, a surface crosslinking agent or its by-products) and high physical properties, and a method for its stable continuous production. Background technique [0002] In recent years, hygienic materials such as disposable diapers, sanitary napkins, and incontinence pads have widely used water-absorbent resins as their constituent materials from the viewpoint of excellent bodily fluid absorbency. Water-absorbent resins are produced through many processes such as polymerization, drying, pulverization, classification, and surface crosslinking (Non-Patent Document 1). The production method of the water-absorbent resin including such a process is disclosed in Patent Documents 1 to 14 and the like. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08F20/06C08J3/12C08L33/02
CPCC08J3/12C08J3/24C08J2333/02C09D133/04C08F20/06C08F220/06C08F222/102C08J3/245
Inventor 野木幸三中村将敏柴田浩史本田耕士渡边雄介松本智嗣中津留玲子石崎邦彦木村一树町田沙耶香
Owner NIPPON SHOKUBAI CO LTD
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