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
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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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