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Method for preparing superabsorbent polymer (SAP) from acrylamide (AM) and maleic acid (MA)

A technology of acrylamide and water-absorbent resin, which is applied in the field of preparation of water-absorbent resin, and can solve problems such as poor temperature resistance, high price, and single raw material

Inactive Publication Date: 2014-11-12
CHONGQING UNIV OF ARTS & SCI
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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

Method used

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  • Method for preparing superabsorbent polymer (SAP) from acrylamide (AM) and maleic acid (MA)

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specific Embodiment approach

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is further described and illustrated below through specific embodiments:

[0013] Weigh 2g of maleic acid, prepare a solution, add 25% NaOH solution to adjust the neutralization degree (N) of maleic acid to 80%; accurately weigh 8g of acrylamide and place it in a 250mL three-necked flask, add the above-mentioned maleic acid Add acid solution and stir well to make it evenly dispersed; add quantitative distilled water to make w(MA+AM)=20% (based on the mass of the system); then add 0.1% of crosslinking agent N,N'-methylbis Acrylamide solution, heated to 50 ° C, dropwise added 0.2% mass fraction of initiator ammonium persulfate-sodium bisulfite solution, continued to stir until uniformly mixed; nitrogen gas was introduced to maintain a constant temperature of 50 ° C for reaction. React for 5 hours to obtain a colorless and transparent colloid; place the colloid in a vacuum oven at 65°C to dry to consta...

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Abstract

The invention relates to a method for preparing a superabsorbent polymer (SAP) from acrylamide (AM) and maleic acid (MA) and discloses a method for preparing the SAP. The method is characterized by comprising the steps of dissolving and mixing AM, MA and a crosslinking agent, adding an initiator for polymerization and then carrying out dewatering and drying, thus preparing the product, namely the superabsorbent 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 and high water absorbency and is environment-friendly and pollution-free.

Description

technical field [0001] The invention relates to a method for preparing water-absorbing resin, in particular to a method for preparing water-absorbing resin by using acrylamide (AM) and maleic acid (MA) as raw materials. 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 relatively expensive. At the same time, although the existing water-ab...

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Application Information

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