CN109012184A - A kind of alkali process polyimide foraminous seperation film and the preparation method and application thereof - Google Patents
A kind of alkali process polyimide foraminous seperation film and the preparation method and application thereof Download PDFInfo
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- CN109012184A CN109012184A CN201810798591.XA CN201810798591A CN109012184A CN 109012184 A CN109012184 A CN 109012184A CN 201810798591 A CN201810798591 A CN 201810798591A CN 109012184 A CN109012184 A CN 109012184A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/027—Nanofiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/147—Microfiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/56—Polyamides, e.g. polyester-amides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/36—Hydrophilic membranes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention discloses a kind of alkali process polyimide foraminous seperation films and the preparation method and application thereof, belong to technical field of polymer materials.Polyimides chain at least one imide group in the alkali process polyimide foraminous seperation film is replaced by amic acid group；Pore structure is evenly distributed in the alkali process polyimide foraminous seperation film.Preparation method is first to dissolve polyimides to form polyimide dope liquid, then prepare polyimide foraminous seperation film using phase separation method, is then immersed in preparation alkali process polyimide foraminous seperation film in aqueous slkali.The present invention being capable of the effectively aperture of synchronization modulation polyimide foraminous seperation film, hydrophily and solvent resistant ability.Alkali process polyimide foraminous seperation film obtained can be used for UF membrane directly or as the basement membrane of composite membrane, and have good separating property.
Description
Technical field
The invention belongs to technical field of polymer materials, separate more particularly, to a kind of alkali process polyimide foraminous
Film and the preparation method and application thereof.
Background technique
Polyimide foraminous seperation film mechanical performance is prominent, thermal stability is high, solvent resistant ability is stronger；In addition there are also certain
Hydrophily (for example, imide bond can form hydrogen bond with water), is concerned as separation membrane material in recent years.However, polyamides is sub-
Amine porous diffusion barrier usually requires to be modified, to optimize its form and property (aperture, hydrophily and solvent resistant ability
Deng), promote its separating property.Polyimide foraminous point can effectively be regulated and controled by changing casting solution composition, film-forming temperature etc.
Aperture from film, but its hydrophily and solvent resistant ability are not influenced significantly；By with other macromolecules or filler physics
The aperture for not only regulating and controlling polyimide foraminous seperation film is blended, but also can greatly promote its hydrophily, but such methods are very
Difficulty is obviously improved its solvent resistant ability；Heat treatment and solvent anneal can effectively reduce the aperture of polyimide foraminous seperation film
And its solvent resistant ability is improved, but both methods would generally reduce its hydrophily；In addition, chemical crosslinking can reduce simultaneously
Hydrophily, aperture and the solvent resistant ability of polyimide foraminous seperation film, but this method would generally generate it is a large amount of organic
Waste liquid.Based on this, explores new method and carry out modified polyimide porous diffusion barrier, improve its form, property and separating property
It is of great significance.
Summary of the invention
The present invention solves the prior art cannot be simultaneously to the aperture of polyimide separation membrane, hydrophily and organic solvent-resistant
The technical issues of being modified, and generating waste liquid in modifying process.
To achieve the above object, according to one aspect of the present invention, a kind of alkali process polyimide foraminous seperation film is provided,
It is characterized in that, polyimides chain at least one imide group in the alkali process polyimide foraminous seperation film is by amide
Acid groups replace；Pore structure is evenly distributed in the alkali process polyimide foraminous seperation film.
Preferably, the diameter of the pore structure is 0.5nm-1 μm.
It is another aspect of this invention to provide that providing a kind of preparation method of alkali process polyimide foraminous seperation film, contain
There are following steps:
S1: in organic solvent by polyimides dissolution, polyimide dope liquid is formed；
S2: polyimide dope liquid described in step S1 is coated on substrate, polyimides is prepared using phase separation method
Porous diffusion barrier；
S3: polyimide foraminous seperation film described in step S2 is impregnated in aqueous slkali, makes the polyimide foraminous point
Replaced from polyimides chain at least one imide group in film by amic acid group, obtains alkali process polyimide foraminous
Seperation film.
Preferably, phase separation method described in step S2 is non-solvent induction phase separation method or thermally induced phase separation；
Preferably, the non-solvent that cannot dissolve polyimides that the non-solvent induction phase separation method uses is deionization
Water, ethyl alcohol or acetone.
Preferably, shown in the structural formula such as formula (I) of polyimides described in step S1:
Wherein R1 is double anhydride residues, and R2 is diamines residue；
Preferably, shown in the structural formula such as formula (I ') of polyimides described in step S1:
Preferably, the concentration of polyimides is 8wt%-28wt% in polyimide dope liquid described in step S1；Step
Organic solvent described in S1 is N-Methyl pyrrolidone, n,N-Dimethylformamide, n,N-dimethylacetamide, dimethyl sulfoxide, four
Hydrogen furans or chloroform.
Preferably, the time of immersion described in step S3 is 1min-120min；Aqueous slkali described in step S3 is sodium hydroxide
At least one of solution, potassium hydroxide solution and Ammonia；Concentration hydroxy is in the aqueous slkali
0.0001mol/L-10mol/L。
It is another aspect of this invention to provide that providing alkali process polyimide foraminous seperation film the answering in UF membrane
With.
Preferably, the alkali process polyimide foraminous seperation film is applied to film as microfiltration membranes, ultrafiltration membrane or nanofiltration membrane
Separation；Or basement membrane application in UF membrane of the alkali process polyimide foraminous seperation film as composite membrane；
Preferably, the alkali process polyimide foraminous seperation film is applied to sea water desalination.
Preferably, the alkali process polyimide foraminous seperation film is applied to UF membrane as organic solvent-resistant film；
Preferably, the alkali process polyimide foraminous seperation film is applied to the separation of Congo red ethanol solution.
In general, compared with prior art, the present invention can obtain it is following the utility model has the advantages that
(1) by the present invention in that polyimides is hydrolyzed and is etched with alkali, the separation of synchronization modulation polyimide foraminous
Aperture, hydrophily and the solvent resistant ability of film, preparation process is simple, and easily operated.Basic hydrolysis makes polyimide foraminous point
Polyimides chain at least one imide group from film is replaced by amic acid group, and the hydrophily of film is caused to enhance, resistance to molten
Agent ability improves；And alkaline etching makes the polyimide foraminous seperation film after hydrolysis be degraded, aperture becomes larger.
(2) alkali process polyimide foraminous seperation film prepared by the present invention may be directly applied to micro-filtration, ultrafiltration and nanofiltration,
It can be used as ultra-thin composite membrane basement membrane and be applied to positive infiltration such as sea water desalination or organic solvent-resistant nanofiltration such as ethyl alcohol and Congo red separation
Deng.Aperture becomes larger to be conducive to improve the performance just permeated with hydrophily enhancing, and the polyimide foraminous seperation film after alkali process is used
In positive infiltration, water flux increases 80% or more, and reversed flux salt reduces 30% or more；Aperture becomes larger to be mentioned with solvent resistant ability
Height is conducive to be promoted the separating property of organic solvent, and the polyimide foraminous seperation film after alkali process is used for ethyl alcohol and Congo red point
From ethyl alcohol flux reaches 11LMH/bar, and Congo red rejection is greater than 99%.
(3) in the present invention, the concentration of polyimides can be any content in polyimide dope liquid, and the present invention is preferably
8wt%-28wt%, under the preferred concentration, the modest viscosity of casting solution, convenient for dissolution and film.Polyimides casting of the present invention
Film liquid phase separation can effectively guarantee the formation of polyimide foraminous seperation film, avoid transfer when subsequent alkali process.This hair
In bright, the aqueous slkali for handling polyimide foraminous seperation film can be any aqueous slkali of any content, preferably
0.0001mol/L-10mol/L NaOH solution, cost is relatively low by one side NaOH, and another aspect NaOH concentration is 0.0001mol/
It is more mild that polyimide foraminous seperation film is handled under conditions of L-10mol/L.
Detailed description of the invention
Fig. 1 is polyimidesStructural formula.
Fig. 2 is alkali process polyimide foraminous seperation filmStructural formula.
Fig. 3 is the general structure of polyimides.
Fig. 4 is the general structure of alkali process polyimide foraminous seperation film.
Fig. 5 is the separating property figure that polyimide foraminous seperation film made from embodiment 4-8 is used to just permeate.
Fig. 6 is the separating property figure that polyimide foraminous seperation film organic solvent-resistant is made in embodiment 5-8.
Fig. 7 is the schematic diagram of the preparation-obtained alkali process polyimides reaction of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
By the present invention in that polyimides is hydrolyzed and is etched with alkali, and it is prepared into alkali process polyimide foraminous point
From film, include the following steps:
S1: polyimides is dissolved under normal temperature conditions and forms polyimide dope liquid；
S2: by casting solution described in step S1 be coated in substrate on, be put into non-solvent, the solvent in casting solution with it is non-molten
Agent swaps, and makes polyimide curing, obtains polyimide foraminous seperation film；Or gathered using thermally induced phase separation
Acid imide porous diffusion barrier；
S3: it is more that polyimide foraminous seperation film described in step S2 is immersed in preparation alkali process polyimides in aqueous slkali
Pore separation membrane.
Aqueous slkali described in step S3 can be any aqueous slkali, preferably NaOH；The general structure of polyimides such as Fig. 3
Shown, the general structure of the polyimide foraminous seperation film of obtained alkali process is as shown in Figure 4；Polyimides is soluble polyamides
Imines, preferablyStructural formula can be as shown in Figure 1, correspondingly, the structure of obtained alkali process polyimide film
Formula is as shown in Figure 2.Fig. 7 show the schematic diagram that the used alkali process polyimides of the present invention reacts one of situation, the alkali
Polyimides chain at least one imide group in processing polyimide foraminous seperation film is replaced by amic acid group.
A kind of alkali process polyimide foraminous seperation film of embodiment 1, it is poly- in the alkali process polyimide foraminous seperation film
At least one imide group of acid imide chain is replaced by amic acid group；In the alkali process polyimide foraminous seperation film
Even that pore structure is distributed with, the diameter of the pore structure is 0.5nm.
Embodiment 2
A kind of alkali process polyimide foraminous seperation film, the polyimides chain in the alkali process polyimide foraminous seperation film
At least one imide group is replaced by amic acid group；It is evenly distributed in the alkali process polyimide foraminous seperation film
Pore structure, the diameter of the pore structure are 20nm.
Embodiment 3
A kind of alkali process polyimide foraminous seperation film, the polyimides chain in the alkali process polyimide foraminous seperation film
At least one imide group is replaced by amic acid group；It is evenly distributed in the alkali process polyimide foraminous seperation film
Pore structure, the diameter of the pore structure are 1 μm.
Embodiment 4
The preparation of polyimide foraminous seperation film (P16) of the present invention, comprising the following steps:
S1: polyimides is dissolved in formation 16wt% polyimide dope in N-Methyl pyrrolidone under normal temperature conditions
Liquid；
S2: casting solution described in step S1 is coated on substrate, then prepares polyamides Asia in water using phase separation method
Amine porous diffusion barrier.
Embodiment 5
The preparation of alkali process polyimide foraminous seperation film (P16-30) of the present invention, comprising the following steps:
S1: polyimides is dissolved in formation 16wt% polyimide dope in N-Methyl pyrrolidone under normal temperature conditions
Liquid；
S2: casting solution described in step S1 is coated on substrate, then molten in 0.1mol/L NaOH using phase separation method
Polyimide foraminous seperation film is prepared in liquid；
S3: polyimide foraminous seperation film described in step S2 is immersed in 30 minutes in 0.1mol/L NaOH solution and is made
Standby alkali process polyimide foraminous seperation film.
Embodiment 6
The preparation of alkali process polyimide foraminous seperation film (P16-60) of the present invention, comprising the following steps:
S1: polyimides is dissolved in formation 16wt% polyimide dope in N-Methyl pyrrolidone under normal temperature conditions
Liquid；
S2: casting solution described in step S1 is coated on substrate, then molten in 0.1mol/L NaOH using phase separation method
Polyimide foraminous seperation film is prepared in liquid；
S3: polyimide foraminous seperation film described in step S2 is immersed in 60 minutes in 0.1mol/L NaOH solution and is made
Standby alkali process polyimide foraminous seperation film.
Embodiment 7
The preparation of alkali process polyimide foraminous seperation film (P16-90) of the present invention, comprising the following steps:
S1: polyimides is dissolved in formation 16wt% polyimide dope in N-Methyl pyrrolidone under normal temperature conditions
Liquid；
S2: casting solution described in step S1 is coated on substrate, then molten in 0.1mol/L NaOH using phase separation method
Polyimide foraminous seperation film is prepared in liquid；
S3: polyimide foraminous seperation film described in step S2 is immersed in 90 minutes in 0.1mol/L NaOH solution and is made
Standby alkali process polyimide foraminous seperation film.
Embodiment 8
The preparation of alkali process polyimide foraminous seperation film (P16-120) of the present invention, comprising the following steps:
S1: polyimides is dissolved in formation 16wt% polyimide dope in N-Methyl pyrrolidone under normal temperature conditions
Liquid；
S2: casting solution described in step S1 is coated on substrate, then molten in 0.1mol/L NaOH using phase separation method
Polyimide foraminous seperation film is prepared in liquid；
S3: polyimide foraminous seperation film described in step S2 is immersed in 120 minutes in 0.1mol/L NaOH solution and is made
Standby alkali process polyimide foraminous seperation film.
Embodiment 9
It is light to be applied to positive infiltration seawater using the polyimide foraminous seperation film in embodiment 4 as the basement membrane of ultra-thin composite membrane
Change.
Embodiment 10
It is applied to positive infiltration for the alkali process polyimide foraminous seperation film in embodiment 5 as the basement membrane of ultra-thin composite membrane
Sea water desalination.
Embodiment 11
It is applied to positive infiltration for the alkali process polyimide foraminous seperation film in embodiment 6 as the basement membrane of ultra-thin composite membrane
Sea water desalination.
Embodiment 12
It is applied to positive infiltration for the alkali process polyimide foraminous seperation film in embodiment 7 as the basement membrane of ultra-thin composite membrane
Sea water desalination.
Embodiment 13
It is applied to positive infiltration for the alkali process polyimide foraminous seperation film in embodiment 8 as the basement membrane of ultra-thin composite membrane
Sea water desalination.
Embodiment 14
It is applied to using the alkali process polyimide foraminous seperation film in embodiment 7 as the basement membrane of ultra-thin composite membrane organic molten
The Congo red separation of ethyl alcohol-in agent nanofiltration.
Interpretation of result: table 1 shows the pore size data of embodiment 4-8.Alkali process from the point of view of test result, in embodiment 8
The aperture of polyimide foraminous seperation film is maximum.Should the result shows that, when the aperture of polyimide foraminous seperation film is with alkali process
Between increase and become larger.
The pore size data of 1 embodiment 4-8 of table
Table 2 shows the water contact angle data of embodiment 4-8.From the point of view of test result, the alkali process polyamides in embodiment 8 is sub-
The water contact angle of amine porous diffusion barrier is minimum.Should the result shows that, when the hydrophily of polyimide foraminous seperation film is with alkali process
Between increase and increase.
The pore size data of 1 embodiment 4-8 of table
Table 3 shows the gel content data of embodiment 4-8.Alkali process polyimides from the point of view of test result, in embodiment 7
Gel content of the porous diffusion barrier in N-Methyl pyrrolidone reaches 100wt%.Should the result shows that, polyimide foraminous seperation film
Solvent resistant ability enhance as time increases, the solvent resistant of the alkali process polyimide foraminous seperation film in embodiment 7
Ability has reached most preferably.
The gel content data of 3 embodiment 4-8 of table
Fig. 5 shows the separating property of embodiment 9-13.Alkali process polyimides from the point of view of test result, in embodiment 7
The water flux highest for the ultra-thin composite membrane that porous diffusion barrier is prepared as basement membrane, reversed flux salt are minimum.Specifically, with implementation
Polyimide foraminous seperation film in example 4 is compared, and the water flux of the alkali process polyimide foraminous seperation film in embodiment 7 increases
80%, reversed flux salt reduces 30%.Should the result shows that, alkali process polyimide foraminous seperation film in embodiment 7
Aperture and hydrophily synergistic effect are best, best to the promotion effect of the performance of corresponding ultra-thin composite membrane.
Fig. 6 shows the separating property of embodiment 14.From the point of view of test result, the alkali process polyimides in embodiment 7 is more
The pore separation membrane performance Congo red for separating alcohol-as ultra-thin composite membrane prepared by basement membrane is stablized.Specifically, embodiment
Alkali process polyimide foraminous seperation film in 7 is used for ethyl alcohol and Congo red separation, and ethyl alcohol flux reaches 11LMH/bar, the Congo
Red rejection is greater than 99%.Should the result shows that, the alkali process polyimide foraminous seperation film in embodiment 7 is Congo red in ethyl alcohol-
Separation process in it is very stable, aperture become larger with solvent resistant ability improve is conducive to promoted organic solvent separating property.
The preparation method of alkali process polyimide foraminous seperation film can synchronization modulation polyimide foraminous point through the invention
Aperture, hydrophily and solvent resistant ability from film.The alkali process polyimide foraminous seperation film of preparation may be directly applied to micro-
Filter, ultrafiltration and nanofiltration, but it is not limited to these UF membrane fields.Also the basement membrane that can be used as ultra-thin composite membrane is applied to just permeate or have
Solvent nanofiltration, but it is not limited to these UF membrane fields.
The alkali process polyimide foraminous seperation film prepared in the present invention has preferable film form and physical and chemical performance (hole
Diameter, hydrophily and solvent resistant ability), the basement membrane as ultra-thin composite membrane is applied to positive penetration sea water desalinization and organic solvent nanofiltration
In ethyl alcohol-it is Congo red separation show preferable performance, also there is potential application prospect in other UF membrane fields.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of alkali process polyimide foraminous seperation film, which is characterized in that in the alkali process polyimide foraminous seperation film
At least one imide group of polyimides chain is replaced by amic acid group；In the alkali process polyimide foraminous seperation film
It is evenly distributed with pore structure.
2. alkali process polyimide foraminous seperation film as described in claim 1, which is characterized in that the diameter of the pore structure is
0.5nm-1μm。
3. a kind of preparation method of alkali process polyimide foraminous seperation film, which is characterized in that contain following steps:
S1: in organic solvent by polyimides dissolution, polyimide dope liquid is formed；
S2: polyimide dope liquid described in step S1 is coated on substrate, polyimide foraminous is prepared using phase separation method
Seperation film；
S3: polyimide foraminous seperation film described in step S2 is impregnated in aqueous slkali, makes the polyimide foraminous seperation film
In polyimides chain at least one imide group replaced by amic acid group, obtain the separation of alkali process polyimide foraminous
Film.
4. the preparation method of alkali process polyimide foraminous seperation film as claimed in claim 3, which is characterized in that described in step S2
Phase separation method is non-solvent induction phase separation method or thermally induced phase separation；
Preferably, the non-solvent that cannot dissolve polyimides that the non-solvent induction phase separation method uses is deionized water, second
Alcohol or acetone.
5. the preparation method of alkali process polyimide foraminous seperation film as claimed in claim 3, which is characterized in that described in step S1
Polyimides structural formula such as formula (I) shown in:
Wherein R1 is double anhydride residues, and R2 is diamines residue；
Preferably, shown in the structural formula such as formula (I ') of polyimides described in step S1:
6. the preparation method of alkali process polyimide foraminous seperation film as claimed in claim 3, which is characterized in that described in step S1
Polyimide dope liquid in polyimides concentration be 8wt%-28wt%；Organic solvent described in step S1 is N- methylpyrrole
Alkanone, n,N-Dimethylformamide, n,N-dimethylacetamide, dimethyl sulfoxide, tetrahydrofuran or chloroform.
7. the preparation method of alkali process polyimide foraminous seperation film as claimed in claim 3, which is characterized in that described in step S3
The time of immersion is 1min-120min；Aqueous slkali described in step S3 is sodium hydroxide solution, potassium hydroxide solution and hydroxide
At least one of ammonium salt solution；Concentration hydroxy is 0.0001mol/L-10mol/L in the aqueous slkali.
8. application of the alkali process polyimide foraminous seperation film as claimed in claim 1 or 2 in UF membrane.
9. application as claimed in claim 8, which is characterized in that the alkali process polyimide foraminous seperation film is as micro-filtration
Film, ultrafiltration membrane or nanofiltration membrane are applied to UF membrane；Or base of the alkali process polyimide foraminous seperation film as composite membrane
Application of the film in UF membrane；
Preferably, the alkali process polyimide foraminous seperation film is applied to sea water desalination.
10. application as claimed in claim 8, which is characterized in that the alkali process polyimide foraminous seperation film has as resistance to
Solvent film is applied to UF membrane；
Preferably, the alkali process polyimide foraminous seperation film is applied to the separation of Congo red ethanol solution.
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| CN112646371A (en) * | 2019-10-11 | 2021-04-13 | 住友化学株式会社 | Optical film and flexible display device |
| CN112755822A (en) * | 2020-12-24 | 2021-05-07 | 华中科技大学 | Application of metal ion coordination crosslinked polyimide porous membrane |
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| EP0436720A1 (en) * | 1987-12-02 | 1991-07-17 | JAPAN as represented by MINISTER OF INTERNATIONAL TRADE AND INDUSTRY, DIRECTOR GENERAL, BASIC INDUSTRIES BUREAU | Hydrolyzed membrane and process for its production |
| CN101432060A (en) * | 2006-04-28 | 2009-05-13 | 帝国创新有限公司 | Asymmetric membranes for use in nanofiltration |
| CN105344252A (en) * | 2015-10-27 | 2016-02-24 | 华中科技大学 | Method and product for improving the antifouling property of polyimide film |
| WO2017087422A1 (en) * | 2015-11-16 | 2017-05-26 | The Regents Of The University Of California | Adsorption-enhanced and plasticization resistant composite membranes |
| CN106731866A (en) * | 2016-12-02 | 2017-05-31 | 宁波沃浦膜科技有限公司 | A kind of preparation method for weaving tube enhancement type hollow fiber ultrafiltration membrane |
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| CN112646371A (en) * | 2019-10-11 | 2021-04-13 | 住友化学株式会社 | Optical film and flexible display device |
| CN112755822A (en) * | 2020-12-24 | 2021-05-07 | 华中科技大学 | Application of metal ion coordination crosslinked polyimide porous membrane |
| CN112755822B (en) * | 2020-12-24 | 2022-03-18 | 华中科技大学 | Application of metal ion coordination crosslinked polyimide porous membrane |
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