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Preparation method of salt-tolerant super absorbent polymer (SAP)

A water-absorbent resin and salt-resistant technology, applied in the field of water-absorbent resin preparation, can solve the problems of poor temperature resistance, high price, single raw material, etc.

Inactive Publication Date: 2014-11-12
CHONGQING UNIV OF ARTS & SCI
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  • Description
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  • Application Information

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Problems solved by technology

The current preparation of water-absorbent resin has a single raw material and is expensive
At the same time, although the existing water-absorbent resin has strong water absorption energy as a whole, its salt resistance and temperature resistance are poor; the absorption rate of physiological saline is only dozens of times, and the water absorption mechanism needs further breakthroughs

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  • Preparation method of salt-tolerant super absorbent polymer (SAP)

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specific Embodiment approach

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is further described and illustrated below through specific embodiments:

[0012] Weigh 3g of maleic acid, prepare a solution, add 25% NaOH solution to adjust the neutralization degree (N) of maleic acid to 80%; accurately weigh 5g of acrylamide, 2g of 2-acrylamido-2-methylpropane Put the sulfonic acid in a 250mL three-necked flask, add distilled water and stir to make it evenly dispersed; pour the maleic acid solution into the three-necked flask, add a certain amount of distilled water to make w(MA+AM+AMPS)=20% (based on the quality of the system ); then add 0.1% mass fraction of cross-linking agent N,N'-methylenebisacryloyl solution, heat up to 50°C; stir at a speed of less than or equal to 100rpm for 10 minutes, then dropwise add 0.2% mass fraction of initiator over Ammonium sulfate-sodium bisulfite solution, continue to stir until uniformly mixed; nitrogen gas is introduced to maintain a constan...

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Abstract

The invention relates to a preparation method of a salt-tolerant super absorbent polymer (SAP) and discloses a method for preparing the salt-tolerant SAP. The method is characterized by comprising the steps of dissolving and mixing maleic acid (MA), acrylamide (AM), 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and a crosslinking agent, adding an initiator for polymerization and carrying out dewatering and drying, thus preparing the product, namely the salt-tolerant super absorbent polymer. The method has the beneficial effects that the whole synthesis condition is simple; the cost is low; industrial production is safe and is easy to control; the product has stable quality, high water absorbency and good salt tolerance and is pollution-free.

Description

technical field [0001] The present invention relates to a preparation method of water-absorbent resin, in particular to a method for preparing water-absorbent resin by using acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and maleic acid (MA) as raw materials Methods. Background technique [0002] Water-absorbent resin (SAP) has a high water absorption function of absorbing water hundreds to thousands of times heavier than itself, and has excellent water retention performance. Once it absorbs water and swells into a hydrogel, it is difficult to separate the water even if it is pressurized. Water-absorbent resin is a functional polymer material characterized by a large number of hydrophilic groups, and is a widely used industrial product. The existing superabsorbent resin method is mainly prepared from starch, carboxymethyl cellulose, acrylic acid, etc. by polymerization. The current preparation of water-absorbent resin has a single raw material and is rel...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F222/02C08F220/58C08F222/38
Inventor 蒋山泉
Owner CHONGQING UNIV OF ARTS & SCI
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