Preparation method for polyacrylic acid large-grain bead-shaped water absorbing resin

A technology of water-absorbent resin and large particles, which is applied in the field of reverse-phase suspension synthesis of polyacrylic acid-based large-particle bead-shaped water-absorbent resins, which can solve the problems of increased resin particle size factors, unfavorable industrial production, and increased synthesis steps, and achieve simplified synthesis steps and post-processing effects

Inactive Publication Date: 2011-04-27
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method increases the synthesis steps and increases the factors affecting the particle size of the resin, which is not conducive to industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Measure 55mL of carbon tetrachloride and 95mL of toluene, mix them into a continuous phase, add them into a 250mL three-necked flask, then add 0.16g of ethyl cellulose, stir in a water bath and heat up to 43°C to dissolve.

[0024] (2) Weigh 6 grams of acrylic acid and 10 mL of 6.25 mol / L sodium hydroxide solution, neutralize the two under cooling conditions, and place them at room temperature.

[0025] (3) Weigh 0.06 g of potassium persulfate, 0.09 g of N,N-methylenebisacrylamide, 0.03 g of sodium sulfite, and 10 g of distilled water, dissolve them and place them aside.

[0026] (4) After mixing all components of (2) and (3) evenly, quickly pour them into a three-neck flask, and stir and react at 64°C for 1 hour. After the reaction, cool to room temperature, filter, wash with methanol, and vacuum dry to obtain a large-particle bead-shaped water-absorbing resin.

[0027] The resin is white particles with an average particle diameter of 2.02 mm and a distilled water...

Embodiment 2

[0029] (1) Measure 67mL of carbon tetrachloride and 83mL of cyclohexane, mix them into a continuous phase, add them into a 250mL three-necked flask, then add 0.23g of ethyl cellulose, stir in a water bath and heat up to 46°C to dissolve .

[0030] (2) Weigh 8.4 grams of acrylic acid and 14 mL of 6.25 mol / L sodium hydroxide solution, neutralize the two under cooling conditions, and place them at room temperature.

[0031] (3) Weigh 0.17 g of potassium persulfate, 0.07 g of N,N-methylenebisacrylamide, 0.09 g of sodium sulfite, and 15 g of distilled water, dissolve them and place them aside.

[0032] (4) After mixing all components of (2) and (3) evenly, quickly pour them into a three-neck flask, and stir and react at 68°C for 50 minutes. After the reaction, cool to room temperature, filter, wash with methanol, and vacuum dry to obtain a large-particle bead-shaped water-absorbing resin.

[0033] The resin is white particles with an average particle diameter of 1.64 mm and a dis...

Embodiment 3

[0035] (1) Measure 60mL of carbon tetrachloride and 90mL of o-xylene, mix them into a continuous phase, add them into a 250mL three-neck flask, then add 0.43g of ethyl cellulose, stir in a water bath and heat up to 50°C to dissolve .

[0036] (2) Weigh 9.6 grams of acrylic acid and 16 mL of 6.25 mol / L sodium hydroxide solution, neutralize the two under cooling conditions, and place them at room temperature.

[0037] (3) Weigh 0.15 g of potassium persulfate, 0.06 g of N,N-methylenebisacrylamide, 0.07 g of sodium sulfite, and 19 g of distilled water, dissolve them and place them aside.

[0038] (4) After mixing all components of (2) and (3) evenly, quickly pour them into a three-necked flask, and stir and react at 60°C for 110 minutes. After the reaction, cool to room temperature, filter, wash with methanol, and vacuum dry to obtain a large-particle bead-shaped water-absorbing resin.

[0039] The resin is white particles with an average particle diameter of 1.23 mm and a disti...

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Abstract

The invention relates to a preparation method for polyacrylic acid large-grain bead-shaped water absorbing resin, which is characterized by comprising the following steps: preparing any of toluene, cyclohexane or ortho-xylene and carbon tetrachloride into a mixed continuous phase; adding ethyl cellulose functioning as oil-soluble dispensing agent, stirring the ethyl cellulose to the mixed continuous phase and heating the mixture; evenly mixing a synthesized monomer with all components of an initiating agent and a cross linking agent; after the reaction is finished, cooling the mixture to roomtemperature; performing filtering, washing and vacuum drying to the mixture to obtain white bead-shaped water absorbing resin; and simultaneously reclaiming the solvent. The invention has the advantages that nitrogen does not need to be led in the reaction process, and acrylic acid (analytical reagent) does not need to be rectified and can be directly used, thereby the synthesis steps and the posttreatment process are simplified. If the dosage of the cross liking agent is small, the water absorption rate is large, but the formed grains have small strength and diameter are prone to agglomeration on surfaces; and if the dosage of the cross linking agent is large, the water absorption rate is correspondingly reduced, but the formed grains have improved strength and larger diameter.

Description

technical field [0001] The invention relates to a preparation method of polyacrylic acid large-particle bead-shaped water-absorbing resin, in particular to a reverse-phase suspension synthesis of polyacrylic acid-based large-particle bead-shaped water-absorbing resin. Background technique [0002] Superabsorbent resin is a kind of functional polymer material with excellent water absorption and water retention. It can absorb water hundreds or even thousands of times its own weight in a short period of time. It is widely used in industry, food industry, daily chemical industry, textile and other fields. Superabsorbent resins are classified by raw materials, including starch (graft, carboxymethylation, etc.), cellulose (carboxymethylation, graft, etc.), synthetic polymer (polyacrylic acid, polyvinyl alcohol) , polyoxyethylene series, etc.) several categories (Zou Xinxi. Super Absorbent. Second Edition. Beijing: Chemical Industry Press, 2002.). Among them, polyacrylic acid-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F2/32
Inventor 范晓东刘勤刘郁杨高志亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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