Method for preparing super absorbent polymer (SAP) from carboxymethylcellulose (CMC) and maleic acid (MA)

A technology of carboxymethyl cellulose and water-absorbent resin, applied in the field of preparation of water-absorbent resin, can solve the problems of poor temperature resistance, high price, single raw material and the like

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 super absorbent polymer (SAP) from carboxymethylcellulose (CMC) and maleic acid (MA)

Examples

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Embodiment Construction

[0012] The present invention is further described and illustrated below through specific embodiments:

[0013] Accurately weigh 6g of acrylamide and place it in a 250mL three-neck flask, stir well to disperse it evenly; weigh 3g of maleic acid, prepare a solution, add 25% NaOH solution to adjust the neutralization degree of maleic acid (N) 80%; weigh 1g carboxymethyl cellulose and swell it with distilled water; mix the three monomers in a 250mL three-necked flask, add quantitative distilled water to make w(CMC+MA+AM)=20% (based on the mass of the system) ; Then add 0.1% mass fraction of crosslinking agent N,N'-methylbisacrylamide solution, heat to 50 ° C for 10 minutes, then dropwise add 0.2% mass fraction of initiator ammonium persulfate-sodium bisulfite solution, Continue to stir until the mixture is uniform; feed nitrogen 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 o...

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Abstract

The invention relates to a method for preparing a super absorbent polymer (SAP) from carboxymethylcellulose (CMC) and maleic acid (MA) and discloses a method for preparing the SAP. The method is characterized by comprising the steps of dissolving and mixing CMC, MA, acrylamide (AM) and a crosslinking agent, adding an initiator for polymerization and carrying out dewatering and drying, thus preparing the product, namely the 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 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 carboxymethyl cellulose (CMC), maleic acid (MA) and acrylamide (AM) 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,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F222/02C08F220/56C08F222/38C08F4/40
Inventor 蒋山泉
Owner CHONGQING UNIV OF ARTS & SCI
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