Chitosan/ionic liquid cross-linked gel film with sandwich structure and preparation method thereof
An ionic liquid and cross-linked gel technology, applied in the field of membrane separation, to achieve the effects of easy chemical modification, excellent stability and good mechanical properties
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Embodiment 1
[0021] (1) Preparation of gel film:
[0022] Mix 10 parts of chitosan, 70 parts of 2% acetic acid aqueous solution and 20 parts of 1-methyl-3-ethylimidazolium hexafluorophosphate at 50°C and spread them on a polytetrafluoroethylene board , drying the solvent to obtain a gel film.
[0023] (2) The surface layer of the film is re-crosslinked:
[0024] Dissolve 2 parts of diphenylmethane diisocyanate and 2 drops of dibutyltin dilaurate in 98 parts of n-hexane to form a cross-linking agent solution, and immerse the above-mentioned gel film in the cross-linking agent solution for 0.5 hour to form a gel film surface cross-linking;
[0025] (3) Post-processing:
[0026] The cross-linked gel film was dried in the air for 24 hours, then transferred to a vacuum drying oven, and treated at 30° C. for 24 hours to obtain a sandwich-structured chitosan / ionic liquid cross-linked gel film.
[0027] The aforementioned sandwich-structured chitosan / ionic liquid cross-linked gel membrane was ...
Embodiment 2
[0029] (1) Preparation of gel film:
[0030] Mix 10 parts of chitosan, 80 parts of 3% acetic acid aqueous solution and 10 parts of 1-octyl-3-methylimidazolium tetrafluoroborate at 40°C and spread them on a polytetrafluoroethylene plate Then, the solvent was dried to obtain a gel film.
[0031] (2) The surface layer of the film is re-crosslinked:
[0032] Dissolve 5 parts of isophorone diisocyanate and 1 drop of dibutyltin dilaurate in 95 parts of n-hexane to form a cross-linking agent solution, and immerse the above-mentioned gel film in the cross-linking agent solution for 0.2 hours to form a gel film surface cross-linking;
[0033] (3) Post-processing:
[0034] The cross-linked gel film was dried in the air for 24 hours, then transferred to a vacuum drying oven, and treated at 30° C. for 24 hours to obtain a sandwich-structured chitosan / ionic liquid cross-linked gel film.
[0035] The aforementioned sandwich-structured chitosan / ionic liquid cross-linked gel membrane was ...
Embodiment 3
[0037] (1) Preparation of gel film:
[0038] Mix 20 parts of chitosan, 80 parts of 3% acetic acid aqueous solution and 10 parts of 1-butyl-3-methylimidazole bistrifluoromethanesulfonimide salt at 40°C and spread them on poly Dry the solvent on a tetrafluoroethylene plate to obtain a gel film.
[0039] (2) The surface layer of the film is re-crosslinked:
[0040] Dissolve 2 parts of hexamethylene diisocyanate and 2 drops of dibutyltin dilaurate in 98 parts of n-hexane to form a cross-linking agent solution, and immerse the above-mentioned gel film in the cross-linking agent solution for 12 hours to form a gel film surface cross-linking;
[0041] (3) Post-processing:
[0042] The cross-linked gel film was dried in the air for 24 hours, then transferred to a vacuum drying oven, and treated at 30° C. for 24 hours to obtain a sandwich-structured chitosan / ionic liquid cross-linked gel film.
[0043] The aforementioned sandwich-structured chitosan / ionic liquid cross-linked gel me...
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