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Preparation method of cross-linked chitosan resin

A technology for cross-linking chitosan and chitosan solution, which is applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., and can solve problems such as poor acid resistance, low adsorption capacity, and low mechanical strength. problem, to achieve the effect of excellent ball forming performance and strong adsorption performance

Inactive Publication Date: 2013-03-27
王然
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of cross-linked chitosan resin, the present invention overcomes the above-mentioned cross-linked chitosan resin low adsorption capacity, poor acid resistance, the shortcomings of low mechanical strength, can produce ball-forming properties Excellent, cross-linked chitosan resin with strong adsorption properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A. prepare 5% chitosan solution with 2% acetic acid solution as solvent;

[0018] b. Add the same volume of liquid paraffin in the above solution;

[0019] c. Stir the above mixed solution at a speed of 180 rpm at room temperature for 10 minutes, then heat up to 50°C, and add 0.25 ml of S-80 emulsifier, stir for 10 minutes, then heat up to 60°C, and add 11.6 ml of formaldehyde, After 1 hour of reaction, the pH was adjusted to 10. Then 8.8 ml of epichlorohydrin solution was added, the temperature was raised to 70° C., and 5% aqueous sodium hydroxide solution was continuously added dropwise to control the pH of the system at about 10, and the reaction was continued for 2 hours.

[0020] d. The resin obtained from the above reaction is filtered, washed with water, and then washed with petroleum ether to remove organic residues. Then soak the resin with 1 mol / L hydrochloric acid for 9 hours at 70°C, wash with water, wash with alkali, wash with water until neutral, and fin...

Embodiment 2

[0022] A. prepare 4% chitosan solution with 2% acetic acid solution as solvent;

[0023] b. Add the same volume of liquid paraffin in the above solution;

[0024] c. Stir the above mixed solution at a speed of 180 rpm at room temperature for 10 minutes, then heat up to 50°C, and add 0.2 ml of S-80 emulsifier, stir for 10 minutes, then heat up to 60°C, and add 10 ml of formaldehyde, After 1 hour of reaction, the pH was adjusted to 10. Then 8 ml of epichlorohydrin solution was added, the temperature was raised to 70° C., and 5% aqueous sodium hydroxide solution was continuously added dropwise to control the pH of the system at about 10, and the reaction was continued for 2 hours.

[0025] d. The resin obtained from the above reaction is filtered, washed with water, and then washed with petroleum ether to remove organic residues. Then soak the resin with 1 mol / L hydrochloric acid for 9 hours at 70°C, wash with water, wash with alkali, wash with water until neutral, and finally ...

Embodiment 3

[0027] A. prepare 5% chitosan solution with 2% acetic acid solution as solvent;

[0028] b. Add the same volume of liquid paraffin in the above solution;

[0029] c. Stir the above mixed solution at a speed of 180 rpm at room temperature for 10 minutes, then heat up to 50°C, and add 0.25 ml of S-80 emulsifier, stir for 10 minutes, then heat up to 60°C, and add 12 ml of formaldehyde, After 1 hour of reaction, the pH was adjusted to 10. Then 10 ml of epichlorohydrin solution was added, the temperature was raised to 70° C., and 5% aqueous sodium hydroxide solution was continuously added dropwise to control the pH of the system at about 10, and the reaction was continued for 2 hours.

[0030] d. the resin obtained by the above reaction is filtered, washed with petroleum ether to remove organic residues. Then soak the resin with 1 mol / L hydrochloric acid for 9 hours at 70°C, wash with water, wash with alkali, wash with water until neutral, and finally dry to constant weight.

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Abstract

The invention discloses a preparation method of a cross-linked chitosan resin. The method provided by the invention comprises reaction liquid preparation, resin producing, and resin pretreatment. Main steps comprise: (a) a chitosan solution is prepared and is added into paraffin; (b) a stirring device is started and a resin producing reaction is carried out; (c) obtained resin is filtered, washed, and is subjected to an impurity-removing treatment; and (d) the resin is pretreated. With the method provided by the invention, cross-linked chitosan resin with excellent pelletization performance and relatively high adhesion performance can be prepared.

Description

technical field [0001] The invention relates to a preparation method of resin, in particular to a preparation method of formaldehyde and epichlorohydrin cross-linked chitosan resin. Background technique [0002] Chitosan is a natural polymer material with excellent properties, which has good adsorption properties for transition metal ions, acids, organic dyes, proteins, etc. However, it is unstable in acidic medium and can be dissolved in strong acidity, so its application is greatly limited, so it must be cross-linked. However, the adsorption capacity of the cross-linked resin is generally reduced, the acid resistance is poor, and the mechanical strength is not high. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of cross-linked chitosan resin, the present invention overcomes the above-mentioned cross-linked chitosan resin low adsorption capacity, poor acid resistance, the shortcomings of low mechanical strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
Inventor 王然
Owner 王然
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