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Preparation method of poly (acrylic acid-vinyl acetate)-polyvinyl alcohol interpenetrating network super absorbent resin

A technology of super absorbent resin and vinyl acetate, applied in the field of poly(acrylic acid-vinyl acetate)-polyvinyl alcohol interpenetrating network super absorbent resin, can solve problems such as reduction, achieve simple post-processing, stable reaction, The effect of improving water absorption and salt tolerance

Inactive Publication Date: 2014-07-23
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the current artificially synthesized superabsorbent resin, whether it is semi-synthetic or fully synthetic superabsorbent resin, its ability to absorb salt water is greatly reduced compared with the ability to absorb deionized water, and most of them only absorb water. It is urgent to strengthen the research on how to improve the salt absorption rate of superabsorbent resin
At present, there is no research report on the preparation of superabsorbent resin by interpenetrating anion, cation and non-ion through interpenetrating network in reversed phase suspension.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Equipped with thermometer, reflux condenser, N 2 Add 100ml of cyclohexane and 0.58g of Span-60 into the 250mL four-neck flask with catheter and stirrer, heat to 35°C, and cool to room temperature after the Span-60 dissolves. Add 14.0 g of 20% NaOH solution dropwise to 7.5 g of acrylic acid with stirring to make acrylic acid with a neutralization degree of 70%. Acrylic acid solution with a neutralization degree of 70%, 2.5g vinyl acetate, 0.8g (8%, based on the mass of acrylic acid, the same below) polyvinyl alcohol solution, 0.025g N,N-methylenebisacrylamide and 0.03 Dissolve g potassium persulfate in distilled water, then add it into the oil phase composed of cyclohexane and Span-60, stir for about 15 minutes, heat to 70°C under nitrogen protection, stir, and react for 2.0 hours; after the reaction , filtered, washed 3 times with methanol and 1 time with ethanol; soak the obtained product in absolute ethanol for 6.0h, filter with suction, and dry in vacuum to obtain a...

Embodiment 2

[0021] Equipped with thermometer, reflux condenser, N 2 Add 100ml of cyclohexane and 0.5g of Span-60 into the 250mL four-necked flask with catheter and stirrer, heat to 35°C, and cool to room temperature after the Span-60 dissolves. Weigh 8.0 g of acrylic acid, add dropwise 14.0 g of 20% NaOH solution under stirring to prepare an acrylic acid solution with a neutralization degree of 70%. Dissolve the acrylic liquid with a neutralization degree of 70%, 2.0g vinyl acetate, 0.8g polyvinyl alcohol solution, 0.0025g (N,N-methylenebisacrylamide and 0.03g and potassium persulfate in distilled water, and then Add to the oil phase composed of cyclohexane and Span-60, stir for about 15min, then heat to 70°C under the protection of nitrogen, stir, and react for 2.0h. After the reaction, filter, wash with methanol 3 times, wash with ethanol 1 time.The product obtained is soaked 6.0h in dehydrated alcohol, suction filtration, vacuum-drying, obtains white granular resin.Product sucks disti...

Embodiment 3

[0023] Equipped with thermometer, reflux condenser, N 2 Add 100ml of cyclohexane and 0.5g of Span-60 into the 250mL four-necked flask with catheter and stirrer, heat to 35°C, and cool to room temperature after the Span-60 dissolves. Weigh 7.5g of acrylic acid, add dropwise 14.0g of 20% NaOH solution under stirring to prepare a propionic acid solution with a neutralization degree of 70%. Propionic acid solution, 2.5g vinyl acetate, 0.85g polyvinyl alcohol solution, 0.0025g N,N-methylenebisacrylamide and 0.04g potassium persulfate were dissolved in distilled water, and then added to the mixture made of cyclohexane, Span In the oil phase composed of -60, after stirring for about 15 minutes, heat to 70° C. under the protection of nitrogen, stir, and react for 2.0 hours. After the reaction was completed, it was filtered, washed three times with methanol, and washed once with ethanol. The obtained product was soaked in absolute ethanol for 6.0 h, filtered with suction, and dried i...

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PUM

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Abstract

The invention relates to a preparation method of poly (acrylic acid-vinyl acetate)-polyvinyl alcohol interpenetrating network super absorbent resin. The preparation method is characterized by comprising the following steps: 1) dissolving acrylic acid solution, vinyl acetate, polyvinyl alcohol solution, cross-linking agent, namely N, N-methylene-bis-acrylamide and initiator, namely potassium persulfate in distilled water, then adding into an oil phase comprising cyclohexane and dispersant, stirring for about 15-30min, then heating to 50-90 DEG C under the protection of nitrogen, stirring and reacting for 2.0h, wherein the reaction temperature is 50-90 DEG C; 2) filtering after the end of reaction, washing with methanol three times, and washing with ethanol once; 3) soaking the obtained product in anhydrous ethanol for 6.0h, and performing suction filtration and vacuum drying so as to obtain white granular resin. An interpenetrating network polymer with anions and non-ions is formed through an interpenetrating network technology, and the interpenetrating network polymer has better salt resistance and water absorption.

Description

technical field [0001] The invention relates to a preparation method of a salt-resistant superabsorbent resin, in particular to the preparation of interpenetrating and interpenetrating polymers with anions and non-ions by interpenetrating network technology to form poly(acrylic acid-vinyl acetate)-polyvinyl alcohol interpenetrating network Super absorbent resin. Background technique [0002] Superabsorbent resin is a brand-new functional polymer material that has been developed rapidly in recent years. It can absorb a thousand times more water than itself, and the absorbed water is not easy to be squeezed out by mechanical pressure, and has excellent water retention performance. Therefore, it is widely used in forestry, agriculture, industry, hygiene products and medical treatment. [0003] According to different raw materials, superabsorbent resins are divided into three categories: starch, cellulose, and synthetic polymers. The superabsorbent resin was first studied by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/02C08L29/04C08F220/06C08F218/08C08F222/38
Inventor 王翠玲王倩刘树林陈栓虎
Owner NORTHWEST UNIV(CN)
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