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Method for synthesizing super absorbent resin by plant straw

A technology of superabsorbent resin and plant straw, which is applied in the field of synthesizing superabsorbent resin by using plant straw, can solve the problems of unfavorable large-scale production, complicated preparation process, poor salt and alkali resistance, etc. The effect of reducing usage

Inactive Publication Date: 2010-10-20
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technology disclosed in the above patent documents also has defects in varying degrees: the cost of raw materials used is higher than that of plant straw, the preparation process is complicated, and the salt and alkali resistance is poor, which is not conducive to large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The corn stalks were crushed and dried, and 4 g of the obtained cellulose was added to a three-neck flask, 75 mL of 95% absolute ethanol and 3 g of NaOH were added, heated in a water bath at 30° C., and reacted for 1 h. Then add 3.6g of chloroacetic acid, heat in a water bath at 70°C, and react for 1h. Finally, 1gNaOH was added and reacted for 1h. The obtained product was neutralized by adding HCl at 30° C. to make it pH=7. Filter with suction, wash with absolute ethanol, and dry at 60°C. That is, carboxymethyl cellulose.

[0053] Take 3g of carboxymethylcellulose and 50mL of water and activate it in a water bath at 50°C for half an hour, cool to room temperature and add 0.12g of ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) to react for half an hour, prepare 19.5 g of acrylic acid and acrylamide prepolymer with a neutralization degree of 65%, add it to the above solution, heat it in a water bath at 50° C. for one hour, and add 0.0975 g of N,N-methylene After reacting...

Embodiment 2

[0055] The rice straw was crushed and dried, and 4 g of the prepared cellulose was added to a three-necked flask, 75 mL of 95% absolute ethanol and 3 g of NaOH were added, heated in a water bath at 30° C., and reacted for 5 h. Then add 0.4g of chloroacetic acid, heat in a water bath at 70°C, and react for 4h. Finally, 1g NaOH was added and reacted for 3h. The obtained product was neutralized by adding HCl at 30° C. to make it pH=8. Filter with suction, wash with absolute ethanol, and dry at 100°C. That is, carboxymethyl cellulose.

[0056] Take 3g of carboxymethyl cellulose and 50mL of water and activate in a water bath at 50°C for half an hour, cool to room temperature and add 0.12g of ammonium persulfate to react for half an hour to prepare 15g of acrylic acid and acrylamide prepolymer with a neutralization degree of 75%, and add In the above solution, heat in a water bath at 70°C for one and a half hours, add 0.0300g of N,N-methylenebisacrylamide to react for one hour, a...

Embodiment 3

[0058] The plant straw was crushed and dried, and 4 g of the obtained cellulose was added to a three-neck flask, 75 mL of 95% absolute ethanol and 3 g of NaOH were added, heated in a water bath at 30° C., and reacted for 5 h. Then add 2g of chloroacetic acid, heat in a water bath at 70°C, and react for 4h. Finally, 1g NaOH was added and reacted for 2h. The obtained product was neutralized by adding HCl at 30° C. to make it pH=10. Filter with suction, wash with absolute ethanol, and dry at 120°C. That is, carboxymethyl cellulose.

[0059] Take 3g of carboxymethylcellulose and 50mL of water and activate it in a water bath at 50°C for half an hour, cool to room temperature and add 0.0900g of ammonium persulfate to react for half an hour to prepare 19.5g of acrylic acid and acrylamide prepolymer with a neutralization degree of 60%. Add it to the above solution, heat it in a water bath at 60°C for one and a half hours, add 0.0585g of N,N-methylene bisacrylamide to react for one ...

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Abstract

The invention discloses a method for synthesizing super absorbent resin by plant straw and raw material selection. In the synthesizing process, the prepolymer of crylic acid and acrylamide serves as polymerized monomer, the saline alkali tolerance of the super absorbent resin is improved while improving water absorption. The invention chooses renewable plant straw with low cost and wide resource as a raw material, effectively solves the problem of processing plant straws, and has important environmental protection value and economic significance.

Description

technical field [0001] The invention belongs to the research field of polymer water-absorbing swellable resins, and in particular relates to a method for synthesizing superabsorbent resins by using plant stalks. Background technique [0002] Superabsorbent resin is a new type of functional polymer material containing strong hydrophilic groups developed in the 1960s. Due to its excellent water absorption and water retention properties, it has a wide range of applications. At present, three types of superabsorbent resins have been studied, namely starch-based, cellulose-based and synthetic resin-based. Although the starch-based superabsorbent resin has a high water absorption rate, the preparation process is complicated, the raw material price is high, the product has poor heat resistance, is perishable and deteriorates, and is difficult to preserve for a long time. Synthetic resin-based superabsorbent resins have a simple polymerization process and a high conversion ratio of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08B11/12
Inventor 孙国新胡丽杰崔玉夏光明
Owner UNIV OF JINAN
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