Fluorine-containing polysiloxane rubber state composite gas separation membrane, preparation method and application thereof

Abstract

The invention discloses a fluorine-containing polysiloxane rubber state composite gas separation membrane, a preparation method and an application thereof. A porous polymer material is used as a support membrane, and a fluorine-containing polysiloxane material is coated on the surface of the support membrane. The preparation method of the fluorine-containing polysiloxane rubber state composite gas separation membrane comprises the following steps of: dissolving fluorine-containing polysiloxane into a solvent to prepare coating liquid; adding a cross-linking agent and a catalyst into the obtained solution; uniformly stirring, standing and de-foaming; coating the coating liquid on the porous support membrane; and heating, curing and cross-linking until the porous support membrane is dried to obtain the fluorine-containing polysiloxane rubber state composite gas separation membrane. The composite gas separation membrane provided by the invention can be applied to separations of oxygen gas from nitrogen gas, carbon dioxide from nitrogen gas, and organic vapors, and has the characteristics of swelling resistance, resistance to pressure, weather fastness, and the like.

Description

technical field

[0001] The invention belongs to the technical field of gas membrane separation, and relates to a fluorine-containing polysiloxane rubbery composite membrane for gas separation, a preparation method and an application thereof, in particular to a composite membrane suitable for the separation and recovery of oxygen and nitrogen and carbon dioxide and nitrogen, and the preparation of methods and applications. Background technique

[0002] Compared with conventional methods such as cryogenic separation and pressure swing adsorption, the gas membrane separation process has the advantages of less land occupation, less investment, low energy consumption, no phase change, no secondary pollution, flexible and convenient operation, etc., so it has been paid more and more attention. With nearly two decades of research and development, gas membrane separation technology has been widely used in various industrial fields, such as air dehumidification, nitrogen production, ...

Examples

Embodiment 1

[0024] Select porous polyetherimide and polycarbonate with a porosity of 60-80% and a pore diameter of 0.3-0.6 μm as the support membrane; use fluorine-containing polysiloxane (molecular weight Mw=300000-600000) and solvent ethyl acetate , prepare a coating solution with a concentration of 15%, add a cross-linking agent hydrogen-containing silicone oil and a catalyst platinum complex, the concentrations are 2wt.% and 0.15wt.%, stir well and let it stand until there are no bubbles by visual inspection That's it.

[0025] The film liquid is respectively coated on the porous polyetherimide and the polycarbonate support film by a one-step roller coating method; the crosslinking temperature of the oven is controlled at 70-80°C, and it is cured by heating until dry without residual solvent.

[0026] Use it for oxygen nitrogen separation and carbon dioxide nitrogen separation:

[0027] The gas permeation flux and selectivity of fluoropolysiloxane / polyetherimide composite membranes a...

Embodiment 2

[0029] Select porous polyetherimide and polysulfone with a porosity of 60-80% and a pore diameter of 0.3-0.6 μm as the supporting membrane; use fluorine-containing polysiloxane (molecular weight Mw=700000-900000) and solvent ethyl acetate, Prepare the coating solution at a concentration of 12wt.%, add a cross-linking agent hydrogen-containing silicone oil and a catalyst platinum complex, the concentrations of which are 3wt.% and 0.2wt.%, stir well and let it stand until there are no bubbles by visual inspection That's it.

[0030] The film liquid is respectively coated on the porous polyetherimide and polysulfone support membranes by a one-step roller coating method, and the crosslinking temperature of the oven is controlled at 75-85°C, and it is cured by heating until it is dry and there is no residual solvent.

[0031] Use it for oxygen nitrogen separation and carbon dioxide nitrogen separation:

[0032] The gas permeation flux and selectivity of fluoropolysiloxane / polyethe...

Embodiment 3

[0034] Select porous polyetherimide with a porosity of 60-80% and a pore diameter of 0.3-0.6 μm and porous polyacrylonitrile and polyvinylidene fluoride with a porosity of 60-80% and a pore diameter of 0.5-0.7 μm as the support membrane ;Use fluorine-containing polysiloxane (molecular weight Mw=100000~1100000) and solvent ethyl acetate, configuration concentration is the coating liquid of 5wt.%, adds crosslinking agent hydrogen-containing silicone oil and catalyst platinum complex thereinto, its Concentrations are 2wt.% and 0.1wt.%, respectively, after stirring evenly, let it stand until there are no bubbles by visual inspection.

[0035] The membrane solution is coated on the porous polyetherimide support membrane by one-step roller coating method, and the membrane solution is coated on porous polyacrylonitrile and polyvinylidene fluoride by multi-step roller coating method (2-4 times of roller coating). On ethylene, control the crosslinking temperature of the oven at 80-90°C...

technical field

[0001] The invention belongs to the technical field of gas membrane separation, and relates to a fluorine-containing polysiloxane rubbery composite membrane for gas separation, a preparation method and an application thereof, in particular to a composite membrane suitable for the separation and recovery of oxygen and nitrogen and carbon dioxide and nitrogen, and the preparation of methods and applications. Background technique

[0002] Compared with conventional methods such as cryogenic separation and pressure swing adsorption, the gas membrane separation process has the advantages of less land occupation, less investment, low energy consumption, no phase change, no secondary pollution, flexible and convenient operation, etc., so it has been paid more and more attention. With nearly two decades of research and development, gas membrane separation technology has been widely used in various industrial fields, such as air dehumidification, nitrogen production, ...

Examples

Embodiment 1

[0024] Select porous polyetherimide and polycarbonate with a porosity of 60-80% and a pore diameter of 0.3-0.6 μm as the support membrane; use fluorine-containing polysiloxane (molecular weight Mw=300000-600000) and solvent ethyl acetate , prepare a coating solution with a concentration of 15%, add a cross-linking agent hydrogen-containing silicone oil and a catalyst platinum complex, the concentrations are 2wt.% and 0.15wt.%, stir well and let it stand until there are no bubbles by visual inspection That's it.

[0025] The film liquid is respectively coated on the porous polyetherimide and the polycarbonate support film by a one-step roller coating method; the crosslinking temperature of the oven is controlled at 70-80°C, and it is cured by heating until dry without residual solvent.

[0026] Use it for oxygen nitrogen separation and carbon dioxide nitrogen separation:

[0027] The gas permeation flux and selectivity of fluoropolysiloxane / polyetherimide composite membranes a...

Embodiment 2

[0029] Select porous polyetherimide and polysulfone with a porosity of 60-80% and a pore diameter of 0.3-0.6 μm as the supporting membrane; use fluorine-containing polysiloxane (molecular weight Mw=700000-900000) and solvent ethyl acetate, Prepare the coating solution at a concentration of 12wt.%, add a cross-linking agent hydrogen-containing silicone oil and a catalyst platinum complex, the concentrations of which are 3wt.% and 0.2wt.%, stir well and let it stand until there are no bubbles by visual inspection That's it.

[0030] The film liquid is respectively coated on the porous polyetherimide and polysulfone support membranes by a one-step roller coating method, and the crosslinking temperature of the oven is controlled at 75-85°C, and it is cured by heating until it is dry and there is no residual solvent.

[0031] Use it for oxygen nitrogen separation and carbon dioxide nitrogen separation:

[0032] The gas permeation flux and selectivity of fluoropolysiloxane / polyethe...

Embodiment 3

[0034] Select porous polyetherimide with a porosity of 60-80% and a pore diameter of 0.3-0.6 μm and porous polyacrylonitrile and polyvinylidene fluoride with a porosity of 60-80% and a pore diameter of 0.5-0.7 μm as the support membrane ;Use fluorine-containing polysiloxane (molecular weight Mw=100000~1100000) and solvent ethyl acetate, configuration concentration is the coating liquid of 5wt.%, adds crosslinking agent hydrogen-containing silicone oil and catalyst platinum complex thereinto, its Concentrations are 2wt.% and 0.1wt.%, respectively, after stirring evenly, let it stand until there are no bubbles by visual inspection.

[0035] The membrane solution is coated on the porous polyetherimide support membrane by one-step roller coating method, and the membrane solution is coated on porous polyacrylonitrile and polyvinylidene fluoride by multi-step roller coating method (2-4 times of roller coating). On ethylene, control the crosslinking temperature of the oven at 80-90°C...

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