Method for producing water-absorbing resin

A manufacturing method and water-absorbing technology, applied in the field of manufacturing water-absorbing resin, can solve the problems of material elution, poor chemical resistance, etc., and achieve the effect of continuous manufacturing

Active Publication Date: 2016-03-30
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these documents do not describe the materials used specifically, and if the materials used have poor chemical resistance to the raw materials, problems such as material elution may occur when the raw materials are supplied for a long time.

Method used

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  • Method for producing water-absorbing resin
  • Method for producing water-absorbing resin
  • Method for producing water-absorbing resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0231] [Example 1: Immersion Test 1 of Material]

[0232] In the surface cross-linking agent used in the surface cross-linking process, the nozzle cushion whose main material is polytetrafluoroethylene (PTFE) (hollow cone nozzle K140 manufactured by IKEUCHI Co., Ltd. Parts) were impregnated at 30°C for 1 month. As the above-mentioned surface cross-linking agent, a surface cross-linking agent solution having the composition ratio of ethylene carbonate (EC):1,2-propylene glycol (PG):water (W)=0.5:0.5:3.0 was used.

[0233] The volume of the nozzle cushion before dipping in the above surface crosslinking agent is 93 [mm 3 ]. The volume of the nozzle cushion after dipping in the above surface crosslinking agent is 95 [mm 3 ]. The volume of the nozzle cushion increased by immersion in the surface cross-linking agent is 2 [mm 3 ], the volume change rate of the nozzle cushion is 2[%]. The results are shown in Table 1.

[0234] The nozzle cushion whose main material is PTFE doe...

Embodiment 2

[0235] [Example 2: Immersion test 2 of material]

[0236] In the same surface cross-linking agent as in Example 1, immerse a closer made of ceramics (hollow cone nozzle K140 manufactured by IKEUCHI Co., Ltd. - a part in the mold of micro mist generation type extremely small spray volume) at 30°C for 1 month.

[0237] The volume of the closer before being immersed in the above-mentioned surface cross-linking agent is 97 [mm 3 ]. The volume of the closer impregnated with the above-mentioned surface cross-linking agent is 99 [mm 3 ]. The volume of the closure increased by immersion in the surface cross-linking agent is 2 [mm 3 ], the volume change rate of the closer is 2[%]. The results are shown in Table 1.

[0238] The closure whose main material is ceramic does not easily change in volume even if it is immersed in the above-mentioned surface cross-linking agent, so it can be seen that it can be used for stably and continuously supplying the above-mentioned surface cross-...

Embodiment 3

[0243] [Example 3: Immersion test 3 of material]

[0244] In the surface cross-linking agent used in the surface cross-linking process, the main material of the nozzle cushion made of polytetrafluoroethylene (PTFE) (hollow cone nozzle K140 manufactured by IKEUCHI Co., Ltd. - micro mist generation type extremely small spray volume) Parts) impregnated at 30°C for 1 month. As above-mentioned surface cross-linking agent, used the surface cross-linking agent solution of following constituent ratio, namely: 1,4-butadiene (BD):1,2-propanediol (PG): water (W)=0.5:0.5: 3.0.

[0245] The volume of the nozzle cushion before being immersed in the above-mentioned surface cross-linking agent is 93 [mm 3 ]. The volume of the nozzle cushion soaked in the above surface crosslinking agent is 95 [mm 3 ]. The volume of the nozzle cushion increased by immersion in the surface cross-linking agent is 2[mm 3], the volume change rate of the nozzle cushion is 2[%]. The results are shown in Table...

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Abstract

Provided is a method for producing a water-absorbing resin that makes it possible to supply the raw material of the water-absorbing resin continuously in a stable manner. In the method for producing a water-absorbing resin, a member is used that has a post-immersion-test volume change within a range from -5 to +5% in at least moving parts, sites in contact with moving parts, or moving parts and sites in contact with moving parts, these parts being in contact with the raw material, raw material solution, or raw material and raw material solution of the water-absorbing resin.

Description

technical field [0001] The present invention relates to a method for producing a water-absorbent resin. More specifically, the present invention particularly relates to a method for producing a water-absorbent resin capable of stably and continuously supplying a water-absorbent resin raw material. Background technique [0002] Water-absorbent resin (SAP; SuperAbsorbent Polymer: Super Absorbent Polymer) is a water-swellable water-insoluble polymer gelling agent, which is mostly used as sanitary products such as disposable diapers and sanitary napkins, as well as water-retaining agents for farms, Absorbent articles such as industrial waterproofing materials are mainly used for one-time use. With regard to such water-absorbent resins, many monomers have been proposed as raw materials for the water-absorbent resins or hydrophilic polymers. [0003] As the performance of paper diapers, which are the main applications of water-absorbent resins, increases, more functions (physica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/01
CPCC08F2/01C08F2/002C08J3/00
Inventor 渡边雄介森部宽隆安岡幸作
Owner NIPPON SHOKUBAI CO LTD
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