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Prepn process of copolymer of polyaspartic acid and chitosan

A technology of chitosan copolymer and polyaspartic acid, applied in the field of fine chemicals of chemical engineering, can solve problems such as limitation and achieve the effect of small swelling

Inactive Publication Date: 2007-05-09
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the currently synthesized polyaspartic acid materials have strong water absorption, and the volume of the material changes greatly before and after water absorption, which limits their use in some applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Example 1: 10ml of water and 1.0g of polysuccinimide with a weight average molecular weight of about 10,000 were added to a beaker to form a suspension, and then 0.45g of lysine and 0.25g of sodium hydroxide were added under vigorous stirring. After reacting at 27°C for about 6 hours, continue to add 0.15 g of sodium hydroxide and stir for another 1 hour. The pH of the solution was adjusted to 5-6 with dilute hydrochloric acid solution, and then 0.3 ml of 50% glutaraldehyde (solution A) was added.

[0093] In addition, weigh 0.1 g of chitosan, add 10 ml of 1-2% hydrochloric acid and soak until completely dissolved (solution B).

[0094] Solution A was mixed with solution B under vigorous stirring. Then react at 30° C. for 30 minutes. Then, 2mol / L NaOH solution was added dropwise to the mixed solution until the pH was 6-7, and the solid was filtered out and washed with water until neutral. Vacuum dried at 45°C to obtain a light pink granular solid.

Embodiment 2

[0095] Example 2: Add 5ml of water and 1.0g of polysuccinimide with a weight average molecular weight of about 9,000 in a beaker to form a suspension, then gradually add 0.45g of lysine and 0.25g of sodium hydroxide under vigorous stirring aqueous solution. After reacting at 27°C for about 6 hours, continue to add 0.15 g of sodium hydroxide and stir for another 1 hour. Adjust the pH of the solution to 5-6 with dilute hydrochloric acid solution. Then add 0.25g CaCl 2 , to fully dissolve, and then add 0.3ml of 50% glutaraldehyde (solution A).

[0096] In addition, weigh 0.2g of chitosan, add 10ml of 1-2% hydrochloric acid to soak until completely dissolved (solution B).

[0097] Solution A was mixed with solution B under vigorous stirring. Then react at 30° C. for 30 minutes. Then, 2mol / L NaOH solution was added dropwise to the mixed solution until the pH was 6-7, and the solid was filtered out and washed with water until neutral. Vacuum dried at 45°C to obtain a light pin...

Embodiment 3

[0098] Example 3: 1.0 g of polysuccinimide was added into 10 ml of an aqueous solution containing 0.45 g of lysine and 0.4 g of sodium hydroxide under vigorous stirring. The reaction was carried out at 27°C for about 3 hours. Adjust the pH of the solution to 5-6 with dilute hydrochloric acid solution. Then add 0.3g FeCl 3 ·6H 2 O to fully dissolve, then add 0.3ml of 50% glutaraldehyde (solution A).

[0099] In addition, weigh 0.5 g of chitosan, add 10 ml of 1-2% hydrochloric acid and soak until completely dissolved (solution B).

[0100] Solution A was mixed with solution B under vigorous stirring. Then react at 30° C. for 30 minutes. Then, 2mol / L NaOH solution was added dropwise to the mixed solution until the pH was 6-7, and the solid was filtered out and washed with water until neutral. Vacuum dried at 45°C to obtain a light pink granular solid.

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PUM

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Abstract

The present invention discloses process of preparing copolymer of polyaspartic acid and chitosan. Polyaspartic acid with amino group side chain and chitosan are first made to take cross-linking reaction inside acid aqua, and through subsequent alkali adding precipitation to separate out, water washing and vacuum drying, relates to copolymer is prepared. The copolymer has the function of adsorbing heavy metal and some organic matter, and may be applied widely for eliminating heavy metal, halogenated hydrocarbon, organic pigment, dyeing, etc. in medicine industry, food industry, printing and dyeing industry, sewage treatment and other fields.

Description

【Technical field】 [0001] The invention relates to the field of fine chemicals in chemical engineering, in particular to a method for preparing polyaspartic acid and chitosan copolymer. 【Background technique】 [0002] Chitin widely exists in the shells of invertebrates (such as shrimp, crab, insects), as well as in the cell walls of fungi and plants. Chitosan is the deacetylated product of chitin, which has a similar structure to cellulose, and is the only alkaline polysaccharide among natural polysaccharides. Due to its structure contains a large number of free amine groups (-NH 2 ), has a strong complex adsorption effect on some heavy metal ions. But-NH 2 It can accept protons to form salts, so it can be dissolved in acidic aqueous solution, so it should be modified. [0003] The synthesis and application of polyaspartic acid materials have also been reported, see patents CN 1198444A, CN 1631517A. However, most of the currently synthesized polyaspartic acid materials h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/08C08G69/48C08B37/08C08J5/18
Inventor 孙波米镇涛安钢吴新世
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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