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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: 2009-10-07
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 55 mL of carbon tetrachloride and 95 mL of toluene, mix them into a continuous phase, add them to a 250 mL three-necked flask, and then add 0.16 g of ethyl cellulose to it, and stir in a water bath to heat up to 43° C. to dissolve.

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

[0025] (3) Weigh 0.06 g of potassium persulfate, 0.09 g of N,N-methylene bisacrylamide, 0.03 g of sodium sulfite, and 10 g of distilled water, and place them after dissolving them.

[0026] (4) After mixing all the components of (2) and (3) evenly, quickly pour them into a three-necked flask, and stir and react at 64°C for 1 hour. After the reaction is completed, it is cooled to room temperature, filtered, washed with methanol, and dried in vacuum to obtain a large particle bead-shaped water-absorbing resin.

[0027] The resin is white particles with an average...

Embodiment 2

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

[0030] (2) Weigh 8.4 grams of acrylic acid, measure 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 grams of potassium persulfate, 0.07 grams of N,N-methylenebisacrylamide, 0.09 grams of sodium sulfite, and 15 grams of distilled water, and place them after dissolving.

[0032] (4) After mixing all the components in (2) and (3) evenly, quickly pour them into a three-necked flask, and stir and react at 68°C for 50 minutes. After the reaction is completed, it is cooled to room temperature, filtered, washed with methanol, and dried in vacuum to obtain a large particle bead-shaped water-absorbing resin.

[0033] The resin is white p...

Embodiment 3

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

[0036] (2) Weigh 9.6 grams of acrylic acid, measure 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 grams of potassium persulfate, 0.06 grams of N,N-methylenebisacrylamide, 0.07 grams of sodium sulfite, and 19 grams of distilled water, and place them after dissolving them.

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

[0039] The resin is whit...

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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 room temperature; 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 post treatment 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 a polyacrylic acid type large particle bead water-absorbing resin, in particular to the reverse suspension synthesis of a polyacrylic acid type large particle bead water-absorbing resin. Background technique [0002] Super absorbent resin is a kind of functional polymer material with excellent water absorption and water retention. It can absorb water hundreds or even thousands times of its own weight in a short period of time. Therefore, it is used in agriculture, forestry, gardening, medical and health, construction materials, and oil fields. It is widely used in industries, food industry, daily chemical industry, textile and other fields. Super absorbent resins are classified according to raw materials, including starch series (grafted, carboxymethylated, etc.), cellulose series (carboxymethylated, grafted, etc.), synthetic polymer series (polyacrylic acid, polyvinyl alcohol, etc.) , Polyoxyethylene series,...

Claims

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Application Information

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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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