A kind of sandwich structure polyether block amide gel membrane and its thermal crosslinking preparation method

A technology of polyether block amide gel membrane and polyether block amide, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of easy overflow of functional carriers, unfavorable industrial application, poor mechanical properties, etc. problems, to achieve the effect of providing permeate flux and separation selectivity, high permeate flux and separation selectivity, and good mechanical properties

Active Publication Date: 2019-03-12
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing gel films generally have problems such as poor mechanical properties, unstable structure, and easy overflow of functional carriers, which are not conducive to practical industrial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of gel film:

[0023] 10 parts of polyether block amide (the mass ratio of polytetrahydrofuran segment and nylon 12 segment is 4:1), 75 parts of n-butanol and 15 parts of 1-octyl-3-vinylimidazole tetrafluoroborate After mixing evenly at 60°C, spread it on a polytetrafluoroethylene plate, and dry the solvent to prepare a gel film.

[0024] (2) Thermal crosslinking of the film surface:

[0025] The upper and lower surfaces of the above-mentioned gel film are coated with a layer of n-butanol solution containing a thermal initiator and a crosslinking agent, wherein 0.5 parts of thermal initiator azobisisobutyronitrile, 3.5 parts of crosslinking agent 1,6-hexanedi Alcohol diacrylate, 96 parts of n-butanol, transferred to an oven for curing at 70°C for 18 hours, to carry out thermal crosslinking of the surface layer of the gel film.

[0026] (3) Post-processing:

[0027] The thermally cross-linked gel film was dried in the air for 24 hours, then transferred...

Embodiment 2

[0030] (1) Preparation of gel film:

[0031] 15 parts of polyether block amide (the mass ratio of polytetrahydrofuran segment and nylon 12 segment is 2:3), 75 parts of isopropanol and 10 parts of 1-octyl-3-vinylimidazole hexafluorophosphate in After mixing evenly at 80°C, spread it on a polytetrafluoroethylene board, and dry the solvent to obtain a gel film.

[0032] (2) Thermal crosslinking of the film surface:

[0033] The upper and lower surfaces of the above-mentioned gel film are coated with a layer of n-butanol solution containing a thermal initiator and a crosslinking agent, wherein 0.8 parts of thermal initiator azobisisoheptanonitrile, 4 parts of crosslinking agent ethylene dimethacrylate Alcohol ester, 95.2 parts of n-butanol, transferred to an oven for curing at 60°C for 25 hours to carry out thermal crosslinking of the surface layer of the gel film.

[0034] (3) Post-processing:

[0035] The thermally cross-linked gel film was dried in the air for 24 hours, then...

Embodiment 3

[0038] (1) Preparation of gel film:

[0039] 10 parts of polyether block amide (wherein the mass ratio of polytetrahydrofuran segment and nylon 12 segment is 3:2), 70 parts of n-butanol / isopropanol mixed solvent with a mass ratio of 3:1 and 20 parts of 1 - Octyl-3-vinylimidazolium tetrafluoroborate was evenly mixed at 70°C, spread on a polytetrafluoroethylene plate, and the solvent was dried to obtain a gel film.

[0040] (2) Thermal crosslinking of the film surface:

[0041] Coat the upper and lower surfaces of the above-mentioned gel film with a layer of n-butanol solution containing a thermal initiator and a crosslinking agent, wherein 1 part of thermal initiator azoisobutylcyanoformamide, 4 parts of crosslinking agent 1,6- Hexylene glycol diacrylate and 95 parts of n-butanol were transferred to an oven for curing at 70° C. for 10 hours to carry out thermal crosslinking of the surface layer of the gel film.

[0042] (3) Post-processing:

[0043] The thermally cross-linke...

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Abstract

The invention belongs to the technical field of gas-membrane separation and relates to a polyether-block-amide gel membrane with a sandwich structure and a thermal-cross-linking preparation method thereof. The polyether-block-amide gel membrane is characterized by being provided with the sandwich structure, wherein the upper surface layer and the lower surface are cross-linked layers, and a gel layer is arranged in the middle. The preparation method comprises the following process steps: (1) mixing polyether block amide, ionic liquid and a solvent uniformly at certain temperature, flatly laying the mixture on a polytetrafluoroethylene plate, and drying the solvent to prepare the gel membrane; (2) respectively coating a layer of solution containing a thermal initiator and a cross-linking agent on the upper surface layer and the lower surface layer of the gel membrane, transferring into a baking oven, controlling certain temperature and time, and carrying out surface thermal cross-linking reaction of the gel membrane; and (3) drying the cross-linked gel membrane for 24 hours in the air, then transferring into a vacuum drying box, and treating for 24 hours at the temperature of 30 DEG C to obtain the polyether-block-amide gel membrane with the sandwich structure. The polyether-block-amide gel membrane and the preparation method have the advantages that by cross linking of the upper surface layer and the lower surface layer of the membrane, the polyether-block-amide gel membrane with the sandwich structure is formed, and the loss of polyethylene glycol is not easy, so that the durability and the stability of the physical structure and the properties of the membrane are guaranteed. The polyether-block-amide gel membrane and the preparation method are applicable to separating carbon dioxide in mixed gas and recovering organic vapor.

Description

technical field [0001] The invention belongs to the technical field of gas membrane separation, and relates to a sandwich-structured polyether block amide gel membrane and a thermal crosslinking 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, and 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 new typ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/80B01D67/00B01D69/00B01D53/22
CPCY02C20/40
Inventor 白云翔张鹏张春芳孙余凭顾瑾
Owner JIANGNAN UNIV
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