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Method for preparing interpolymer bionic membrane material of poly-asparagine and chitosan

A technology of polyasparagine and chitosan, which is applied in the field of fine chemicals in chemical engineering, can solve the problems of complex preparation process, high price, environmental pollution, etc., achieve good environmental compatibility, facilitate chemical modification, The effect of improving physical properties

Inactive Publication Date: 2007-02-21
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Although the polymer membrane materials that have been developed have good heat resistance, chemical resistance and mechanical properties, the raw materials are expensive and the preparation process is complicated, and organic solvents are generally used in the preparation process.
Most of these solvents are harmful to the human body, and the price is relatively expensive, so the recycling process is essential, which not only increases the production cost, but also causes environmental pollution
These disadvantages have seriously hindered the popularization and application of membrane technology.
In addition, the biodegradability of existing polymer membrane materials is poor, which may cause secondary pollution after being discarded
Does not meet the requirements for environmentally friendly materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: use organic solvent, do not add film strength enhancer to prepare polyaspartic acid and derivatives thereof and chitosan copolymerized biomimetic membrane material, this method comprises the following steps:

[0041] (1) Preparation of polyaspartic acid and derivatives thereof having at least one amine side chain. 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): 0.05-1.0:1, 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 a partially ring-opened polysuccinimide containing at least one amine side chain.

[0042] The raw material polysuccinimide can be obtained by traditional thermal polycondensation method, for example, obta...

Embodiment 2

[0049] Embodiment 2: use organic solvent, do not add film strength enhancing agent to prepare polyaspartic acid and derivatives thereof and chitosan copolymerization biomimetic film material, this method comprises the following steps:

[0050] The basic steps are the same as in Example 1, except that a reducing agent is added to the film obtained in step (7), and the reaction is carried out for 0.5-5 hours at 25-80°C. The reducing agent used can be sodium borohydride, potassium borohydride, or both In the mixture, the molar ratio of the reducing agent to the amine group in the polymer is: 1-5:1.

Embodiment 3

[0051] Embodiment 3: use organic solvent, add film strength enhancer to prepare polyaspartic acid and derivatives thereof and chitosan copolymerized biomimetic membrane material, this method comprises the following steps:

[0052] The basic steps are the same as in Example 1 and Example 2, except that a film strength enhancer is added to the solution obtained in step (4), and then subsequent operations are carried out. The film strength enhancer 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 film strength enhancer to polysuccinimide (according to succinimide unit) is 0.1-1:1.

[0053] Membrane strength enhancers can also be added to the solution (2) of polyaspartic acid or its derivatives with amino side chains, or the chitosan solution (3). Or add several film strength enhancers to the chitosan solution (3), a...

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Abstract

This invention discloses a method for preparing biomimic membrane material of polyasparagine and chitosan copolymer. The method comprises: preparing polyasparagine or its derivative with different side chains, copolymerizing and crosslinking with chitosan in an acidic medium to obtain environmentally friendly biomimic membrane material of polyasparagine and chitosan copolymer. The biomimic membrane material can be used for membrane separation, or as an environment-sensitive membrane material. The biomimic membrane material can be widely applied in such fields as pharmacy, food industry, printing and wastewater treatment.

Description

【Technical field】 [0001] The invention relates to the field of fine chemicals in chemical engineering, in particular to a method for preparing polyasparagine and chitosan copolymerized biomimetic membrane materials. 【Background technique】 [0002] Although the polymer membrane materials that have been developed have good heat resistance, chemical stability and mechanical properties, the raw materials are expensive and the preparation process is complicated, and organic solvents are generally used in the preparation process. Most of these solvents are harmful to the human body and expensive, so the recycling process is essential, which not only increases the production cost, but also causes environmental pollution. These disadvantages have seriously hindered the popularization and application of membrane technology. In addition, the biodegradability of existing polymer membrane materials is poor, which may cause secondary pollution after being discarded. Does not meet the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G73/10C08B37/08C08K5/08C08J5/18C08J7/12
Inventor 孙波安钢薛运周吴新世米镇涛
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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