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A kind of sandwich structure chitosan/ionic liquid cross-linked gel film and preparation method thereof

A technology of ionic liquids and cross-linked gels, applied in the field of membrane separation, to achieve the effects of easy chemical modification, abundant resources, and improved mechanical properties and stability

Active Publication Date: 2019-07-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the existing gel membrane in the field of gas separation, to provide a sandwich structure chitosan / ionic liquid cross-linked gel membrane and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of gel film:

[0023] 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.

[0024] (2) The surface layer of the film is re-crosslinked:

[0025] 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;

[0026] (3) Post-processing:

[0027] 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.

[0028] The aforementioned sandwich-structured chitosan / ionic liquid cross-linked gel membrane was ...

Embodiment 2

[0030] (1) Preparation of gel film:

[0031] 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.

[0032] (2) The surface layer of the film is re-crosslinked:

[0033] 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;

[0034] (3) Post-processing:

[0035] 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.

[0036] The aforementioned sandwich-structured chitosan / ionic liquid cross-linked gel membrane was ...

Embodiment 3

[0038] (1) Preparation of gel film:

[0039] 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.

[0040] (2) The surface layer of the film is re-crosslinked:

[0041] 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;

[0042] (3) Post-processing:

[0043] 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.

[0044] The aforementioned sandwich-structured chitosan / ionic liquid cross-linked gel me...

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Abstract

The invention belongs to the technical field of film separation and relates to a chitosan / ionic liquid cross-linked gel film with a sandwich structure and a preparation method thereof. The film is characterized in that the film has the sandwich structure, the upper and lower surface layers are arranged as cross-linked surfaces and a gel layer is arranged in the middle. The preparation method comprises the following steps: (1) uniformly mixing chitosan, ionic liquid and solvent under a certain temperature, paving on a polytetrafluoroethylene plate, and drying to remove the solvent to obtain a gel film; (2) soaking the gel film in the solution containing the cross-linking agent and catalyst for 0.2-12 hours and performing the surface cross-linking reaction on the gel film; (3) drying the cross-linked gel film in air for 24 hours, and then transferring into a vacuum drying oven, and processing for 24 hours at 30 DEG C, thereby acquiring the chitosan / ionic liquid cross-linked gel film with the sandwich structure. According to the preparation method provided by the invention, the upper and lower surfaces of the film are cross-linked, so that the chitosan / ionic liquid cross-linked gel film with the sandwich structure is formed, the ionic liquid is difficult to run off, the lasting stability of the physical structure and property of the film is ensured and the preparation method is fit for the separating of the carbon dioxide in the mixed gas and the recycling of the organic steam.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a chitosan / ionic liquid cross-linked gel membrane with a sandwich structure and a preparation method thereof. Background technique [0002] current atmospheric CO 2 Concentrations continue to rise, and the greenhouse effect is intensifying, posing a serious threat to the ecological environment on which human beings depend. Conventional CO 2 Separation technologies, such as amine aqueous solution absorption method, cryogenic separation method and pressure swing adsorption method, are accompanied by high energy consumption, high operating costs or the possibility of secondary pollution in the process of realizing gas separation. Therefore, membrane separation technology, which has many advantages such as economy, high efficiency, and environmental protection, has received more and more attention in the field of gas separation. [0003] Gel membrane is a n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/74B01D67/00B01D53/22
CPCY02C20/40
Inventor 张春芳张鹏白云翔顾瑾孙余凭
Owner JIANGNAN UNIV
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