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Method of preparing mercaptopoly asparagic acid and chitin copolymer and use

A technology of mercaptopolyaspartic acid and chitosan copolymer is applied in the field of fine chemicals of chemical engineering, which can solve the problems of limitation and poor adsorption effect, and achieve the effect of small swelling.

Inactive Publication Date: 2006-11-29
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The copolymer has strong adsorption and high adsorption capacity for divalent heavy metal ions, but its adsorption effect on organic heavy metal compounds (such as methylmercury, ethylmercury, etc.) is poor, which makes it in some restricted in application

Method used

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  • Method of preparing mercaptopoly asparagic acid and chitin copolymer and use
  • Method of preparing mercaptopoly asparagic acid and chitin copolymer and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: use organic solvent, do not add templating agent to prepare mercaptopolyaspartic acid / chitosan copolymer, this method comprises the following steps:

[0047] (1) Preparation of polyaspartic acid having a side chain of at least one amine group. The method is to react polysuccinimide with polyamine or its hydrochloride in an organic solvent (such as dimethylformamide). Molar ratio of polyamine to polysuccinimide (according to succinimide unit): 0.05-0.5:1, reaction temperature 20-100°C, reaction time 1-10 hours. After the reaction is complete, add anhydrous methanol or anhydrous ethanol to precipitate the product, filter, and vacuum-dry the filter cake at 40-60° C. for 4 hours to obtain polyaspartic acid with amino side chains.

[0048] The raw material polysuccinimide can be obtained by traditional thermal polycondensation method, for example, obtained by high temperature polymerization of aspartic acid under catalyzed or non-catalyzed conditions, can refe...

Embodiment 2

[0058] Embodiment 2: use organic solvent, add templating agent to prepare mercapto-containing polyaspartic acid / chitosan copolymer, the method may further comprise the steps:

[0059] The basic steps are the same as in Example 1, except that a template agent is added to the solution obtained in step (2), and then subsequent operations are carried out. The template used is preferably CaCl 2 or Ca(NO 3 ) 2 , CaSO 4 , ZnCl 2 , MgCl 2 , MgSO 4 One or a mixture of two or more, or other soluble nickel salts, copper salts, iron salts, manganese salts, etc. The molar ratio of template agent to polysuccinimide (according to succinimide unit) is 0.1-1:1;

[0060] A templating agent can also be added to the chitosan solution (4). Or several templating agents are added to the chitosan solution (4), and other templating agents are added to the solution (2) of polyaspartic acid with amine side chains;

[0061] If necessary, the obtained resin can also be subjected to a release agen...

Embodiment 3

[0062] Embodiment 3: use organic solvent, do not add templating agent to prepare mercapto polyaspartic acid / chitosan copolymer, this method comprises the following steps:

[0063] (1) With the step (1) of embodiment 1, obtain the polyaspartic acid of the side chain containing at least one amine group; The mole of polyamine and polysuccinimide (according to succinimide unit) The ratio is: 0.05-0.50:1.

[0064] (2) With the step (2) of embodiment 1, obtain the aqueous solution of the polyaspartic acid that contains the side chain of an amino group at least, the mass ratio of the polyaspartic acid of band amino side chain and water is: 1 :99-99:1;

[0065] (3) Prepare chitosan solution. Dissolve chitosan in dilute acid solution. The dilute acid solution may be dilute hydrochloric acid solution, acetic acid solution, or a mixture of the two. The concentration of the dilute acid solution is 1-2% (mass fraction). The mass ratio of chitosan to 1-2% dilute acid is: 1:1-1:100;

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Abstract

A mercapto polyaspartic acid-chitosan copolymer used for adsorbing heavy metal, chlorohydrocarbon, organic pigment, dyeing, etc is prepared from cross-linking reaction between polyaspartic acid with amino side chain and chitosan in acidic aqueous solution, and reacting on mercapto carboxylic acid.

Description

【Technical field】 [0001] The invention relates to the field of fine chemicals in chemical engineering, in particular to a method and application for preparing a copolymer of mercapto polyaspartic acid and chitosan. 【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] In the prior art, a method for preparing polyaspartic acid and chitosan copolymer has been disclosed, application number: 200510015063.5. The copolymer has strong ads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G69/48C08B37/08C08J3/24
Inventor 孙波安钢吴新世米镇涛
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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