CN114191997A - Solvent-resistant separation membrane and preparation method thereof - Google Patents
Solvent-resistant separation membrane and preparation method thereof Download PDFInfo
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- CN114191997A CN114191997A CN202010986953.5A CN202010986953A CN114191997A CN 114191997 A CN114191997 A CN 114191997A CN 202010986953 A CN202010986953 A CN 202010986953A CN 114191997 A CN114191997 A CN 114191997A
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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
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/34—Polyvinylidene fluoride
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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
- B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
- B01D61/364—Membrane distillation
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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
- B01D69/06—Flat membranes
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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
- B01D69/08—Hollow fibre membranes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/244—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons
- D06M15/256—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons containing fluorine
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/356—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of other unsaturated compounds containing nitrogen, sulfur, silicon or phosphorus atoms
- D06M15/3562—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of other unsaturated compounds containing nitrogen, sulfur, silicon or phosphorus atoms containing nitrogen
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/22—Polymers or copolymers of halogenated mono-olefins
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Abstract
The invention discloses a solvent-resistant separation membrane, which comprises a support structure and a separation membrane layer, wherein the support structure is a braided fabric prepared from at least one polyvinylidene fluoride copolymer; the separation membrane layer is formed by uniformly coating a casting solution prepared from at least one polyvinylidene fluoride copolymer on the surface of the support structure. The solvent-resistant separation membrane disclosed by the invention has super strong solvent resistance and can be used as a separation membrane material for organic solvents, alkali liquor, etching liquid and wastewater.
Description
Technical Field
The invention belongs to the field of separation membranes, and particularly relates to a solvent-resistant separation membrane and a preparation method thereof.
Background
With the development of the industry, the industries such as petroleum, chemical industry, food engineering, solar energy and the like, particularly the 5G industry which rises in recent years, can use a large amount of corrosive chemicals and organic solvents including alkanes, amines, lubricating base oil, esters, acids, alkalis and the like. The above-mentioned recovery and utilization of corrosive chemicals and organic solvents in the production process or filtration of waste liquid can be achieved by using a membrane separation technique. Common separation membranes include polymeric membranes and inorganic membranes. Common polymer membrane materials include fluorine-containing polymers, polysulfones, polypropylenes, polyvinyl alcohols, polyacrylonitriles, polyvinyl chlorides, polyimides, polycarbonates and the like. Among them, fluoropolymers have excellent chemical resistance, oxidation resistance, insulation properties, and incombustibility, and have been widely studied as polymer film materials.
The strength of the separation membrane is mainly influenced by two factors, namely, the mechanical properties of the material of the separation membrane, and the environment in which the separation membrane is used. When the separating membrane is used for separating corrosive chemicals and organic solvents, the strength of the separating membrane is rapidly reduced along with the prolonging of the using time, so that the selection of a membrane material with solvent resistance to prepare a separating membrane with high strength is an important research direction.
Chinese patent CN 200680044319.8 discloses a braid-reinforced composite hollow fiber membrane, and the polymer resins used for preparing the membrane layer are mainly polysulfone resin, polyethersulfone resin, etc. But the solvent resistance of the polymer resin is poor, the color of the membrane yarn is easy to turn yellow, and the mechanical property is reduced quickly.
Chinese patent CN201380012705.9 discloses a reinforced filter membrane, wherein the support layer comprises yarn made of polyvinylidene fluoride filament and polyester yarn, and the membrane layer is polyvinylidene fluoride homopolymer. But also has the problems of poor solvent resistance, large color change of membrane filaments, fast reduction of mechanical properties and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a solvent-resistant separation membrane which has super solvent resistance and can be used as a separation membrane material of organic solvents, alkali liquor, etching solution and waste water.
The invention is realized by the following technical scheme:
a solvent-resistant separation membrane comprises a support structure and a separation membrane layer, wherein the support structure is a braided fabric prepared from at least one polyvinylidene fluoride copolymer; the separation membrane layer is formed by uniformly coating a casting solution prepared from at least one polyvinylidene fluoride copolymer on the surface of the support structure.
The polyvinylidene fluoride copolymer is formed by copolymerizing vinylidene fluoride (VDF monomer) and fluorine-containing comonomer, wherein the fluorine-containing comonomer is selected from at least one of TrFE monomer, CTFE monomer, CFE monomer, HFP monomer and CDFE monomer; preferably, the polyvinylidene fluoride copolymer is selected from at least one of P (VDF-TrFE), P (VDF-CTFE), P (VDF-CFE), P (VDF-HFP), P (VDF-CDFE), P (VDF-TrFE-CTFE), P (VDF-TrFE-CFE), P (VDF-TrFE-HFP), P (VDF-TrFE-CDFE), P (VDF-TFE-CTFE), P (VDF-TFE-CFE), P (VDF-TFE-HFP), P (VDF-TFE-CDFE); more preferably, the polyvinylidene fluoride copolymer is selected from P (VDF-TrFE), P (VDF-CTFE), P (VDF-CFE), P (VDF-HFP).
The weight average molecular weight of the polyvinylidene fluoride copolymer is 10-100 ten thousand. The mole percentage of VDF structural units in the polyvinylidene fluoride copolymer is 0-100%; preferably 70% to 98%.
The support structure is a woven fabric prepared by melting, spinning and preparing at least one polyvinylidene fluoride copolymer. The braided fabric is a hollow tubular structure or a planar structure.
The casting solution comprises 15-25% of vinylidene fluoride copolymer or a mixture of the vinylidene fluoride copolymer, 60-80% of organic solvent and 5-15% of pore-forming agent. The vinylidene fluoride copolymer mixture refers to a mixture of any two or more vinylidene fluoride copolymers.
The organic solvent is a conventional solvent, and comprises N, N-dimethylacetamide, N-methylpyrrolidone, dimethylformamide, dimethyl sulfoxide, pentane, hexane, cyclohexane, ethyl acetate, dichloroethane, triethyl phosphate, gamma-butyrolactone, caprolactam, tetrahydrodoran, acetone, piperidine, imidazole and the like; preferably, the organic solvent is selected from at least one of N, N-dimethylacetamide, N-methylpyrrolidone, dimethylformamide, dimethyl sulfoxide, triethyl phosphate, γ -butyrolactone; more preferably, the organic solvent is at least one selected from the group consisting of N, N-dimethylacetamide, N-methylpyrrolidone, dimethylformamide, and dimethylsulfoxide.
The pore former is a conventional solvent. Preferably, the pore-forming agent is selected from at least one of polyvinylpyrrolidone, poly glycol, polysorbate-80, hydroxyl cellulose, ethanol, glycerol, tween, span, aluminum oxide, titanium dioxide and lithium chloride; more preferably, the pore-forming agent is selected from at least one of polyvinylpyrrolidone, polyethylene glycol, lithium chloride, polysorbate-80, and titanium dioxide.
Preferably, the polyvinylidene fluoride copolymer of the separation film layer and the polyvinylidene fluoride copolymer of the support structure are copolymerized by adopting the same material, namely vinylidene fluoride and the same fluorine-containing comonomer, so that the purpose of homogeneity enhancement is achieved. The interface bonding state between separation rete and the bearing structure can effectively be improved to homogeneity reinforcing, and the separation rete can not take place to peel off basically between in-process such as high strength is vibrate, backwash between supporting structure, and then promotes the separation precision and the life of separation membrane. Meanwhile, the homogeneous reinforced membrane can reduce or not add additives for improving the binding power in the formula of the membrane casting solution.
The invention also provides a preparation method of the solvent-resistant separation membrane, the invention adopts a liquid-induced phase separation method to prepare the solvent-resistant separation membrane, and the method specifically comprises the following steps:
(1) preparing a support structure: selecting at least one polyvinylidene fluoride copolymer, melting, spinning and preparing into a braided fabric;
(2) preparing a separation membrane layer:
A. preparing a casting solution from 15-25% of vinylidene fluoride copolymer or a mixture of the vinylidene fluoride copolymer, 60-80% of organic solvent and 5-15% of pore-forming agent by mass;
B. extruding the membrane casting solution through a die head at 70-120 ℃, and uniformly coating the membrane casting solution on the surface of the support structure in the step (1) to form a hollow fiber membrane or a flat membrane;
C. rapidly immersing the hollow fiber membrane or the flat membrane into a condensation tank for gelling and curing to obtain a primary membrane;
D. and placing the primary membrane in a post-treatment tank for replacement to obtain the solvent-resistant separation membrane.
The vinylidene fluoride copolymer mixture refers to a mixture of any two or more vinylidene fluoride copolymers.
The temperature of the condensation tank is 10-90 ℃, and preferably 30-50 ℃.
The post-treatment refers to a treatment process of replacing a solvent and a pore-forming agent in the primary film, and the solution in the post-treatment tank is water. The temperature of the solution in the post-treatment tank is 10-90 ℃, and the post-treatment time is 24-48H. Preferably, the temperature of the solution in the post-treatment tank is 30-50 ℃, and the post-treatment time is 24H.
Further, the step (2) comprises: placing the membrane casting solution in a stirring kettle, heating to 70-120 ℃, fully stirring to uniformly mix the membrane casting solution, standing for 24-48H in a vacuum state to defoam the membrane casting solution, extruding the membrane casting solution through a die head at 70-120 ℃, and uniformly coating the membrane casting solution on the surface of the supporting structure to form a hollow fiber membrane or a flat membrane; rapidly immersing the hollow fiber membrane or the flat membrane into a condensation tank for gelling and curing to obtain a primary membrane; and placing the primary membrane in a post-treatment tank at 10-90 ℃ for 24-48H displacement to obtain the solvent-resistant separation membrane.
In the preparation process, the thickness and the aperture of the separation film layer can be adjusted according to requirements; adjusting the thickness of the separation film layer through technological parameters such as extrusion rate, yarn take-up linear speed and the like; the pore diameter of the separation membrane layer is adjusted by a pore-forming agent or the like. Preferably, the thickness of a separation film layer of the solvent-resistant separation film is 50-200 microns, and the average pore diameter is 0.05-10 microns.
The solvent-resistant separation membrane is suitable for the fields of organic solvent and alkali liquor recovery, etching liquid filtration in the microelectronic industry, membrane distillation and the like.
Compared with the prior art, the invention has the beneficial effects that:
1. the separation membrane layer adopts polyvinylidene fluoride copolymer with strong solvent resistance, and can be widely used as a filtration separation membrane of organic solvents, alkali liquor, etching solution and wastewater;
2. the support structure adopts the polyvinylidene fluoride copolymer which is the same as the separation film layer in material, so that the homogeneity is enhanced, the support effect is enhanced, the polyvinylidene fluoride copolymer and the separation film layer can not be peeled off almost, the peeling strength of the separation film is ultra-strong, and the service life of the separation film is further prolonged.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the invention to these embodiments. It will be appreciated by those skilled in the art that the present invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.
Example 1
(1) Preparing a support structure
Polyvinylidene fluoride copolymer P (VDF-HFP) was selected (wherein the molar ratio of VDF was 98%) to be melt-spun and prepared into a braid having a hollow tubular structure.
(2) Preparation of separation Membrane layer
A. Preparing 18% by mass of a P (VDF-HFP) copolymer (the molar percentage of VDF is 98%), 77% by mass of N, N-dimethylacetamide (DMAc) and 5% by mass of polyvinylpyrrolidone (PVP-30) into a casting solution;
B. placing the prepared membrane casting solution in a stirring kettle, fully stirring for 2H at the constant temperature of 90 ℃ to uniformly mix the membrane casting solution, standing for 24H in a vacuum state to defoam the membrane casting solution, extruding the membrane casting solution at the constant temperature of 90 ℃ through a die head, and uniformly coating the membrane casting solution on a hollow fiber tube which is made of polyvinylidene fluoride copolymer P (VDF-HFP) and has the outer diameter of 1.9mm to obtain a hollow fiber membrane;
C. and (3) quickly immersing the hollow fiber membrane into a condensation tank at 50 ℃ for gelling and curing, and then placing the hollow fiber membrane into a post-treatment tank at 50 ℃ for 24H replacement to obtain the solvent-resistant separation membrane.
Example 2
(1) Preparing a support structure
Polyvinylidene fluoride copolymer P (VDF-HFP) was selected (wherein the molar ratio of VDF was 80%) to be melt-spun and prepared into a braid having a hollow tubular structure.
(2) Preparation of separation Membrane layer
A. Preparing 18% by mass of polyvinylidene fluoride copolymer P (VDF-HFP) (the mol percentage of VDF structural units is 80%), 77% by mass of N, N-dimethylacetamide (DMAc) and 5% by mass of polyvinylpyrrolidone (PVP-30) into casting solution;
steps B and C were the same as in example 1.
Example 3
(1) Preparing a support structure
Polyvinylidene fluoride copolymer P (VDF-TrFE) (the mol percentage of VDF structural units is 70%) is selected for melt spinning and is prepared into a braided fabric with a hollow tubular structure.
(2) Preparation of separation Membrane layer
A. Preparing 18% by mass of polyvinylidene fluoride copolymer P (VDF-TrFE) (the molar percentage of VDF structural units is 70%), 77% by mass of N, N-dimethylacetamide (DMAc) and 5% by mass of polyvinylpyrrolidone (PVP-30) into a casting solution;
steps B and C were the same as in example 1.
Example 4
(1) Preparing a support structure
Polyvinylidene fluoride copolymer P (VDF-HFP) (80 mol% of VDF structural units) was selected to be melt-spun and prepared into a flat-structured woven fabric.
(2) Preparation of separation Membrane layer
A. Preparing 18% by mass of polyvinylidene fluoride copolymer P (VDF-HFP) (the mol percentage of VDF structural units is 80%), 77% by mass of N, N-dimethylacetamide (DMAc) and 5% by mass of polyvinylpyrrolidone (PVP-30) into casting solution;
steps B and C differ from example 1 only in that: extruding the casting solution with the constant temperature of 90 ℃ through a die head, and uniformly coating the casting solution on a flat-structure braided fabric made of polyvinylidene fluoride copolymer P (VDF-HFP).
Comparative example 1
(1) Support structure
Selecting a braided fabric with a hollow tubular structure prepared from polyester resin (PET).
(2) Preparation of separation Membrane layer
A. Preparing a casting solution from 18 mass percent of polyvinylidene fluoride homopolymer (PVDF), 77 mass percent of N, N-dimethylacetamide (DMAc) and 5 mass percent of polyvinylpyrrolidone (PVP-30);
steps B and C were the same as in example 1.
Comparative example 2
(1) Support structure
Ethylene-chlorotrifluoroethylene copolymer (ECTFE) is selected to be melt-spun and prepared into braided fabric with a hollow tubular structure.
(2) Preparation of separation Membrane layer
A. Preparing 18% by mass of polyvinylidene fluoride copolymer P (VDF-HFP) (the mol percentage of VDF structural units is 80%), 77% by mass of N, N-dimethylacetamide (DMAc) and 5% by mass of polyvinylpyrrolidone (PVP-30) into casting solution;
steps B and C were the same as in example 1.
Indexes and performance tests are carried out on the separation membranes prepared in the embodiments 1-4 and the comparative examples 1-2, and the test method mainly comprises the following steps:
(1) measuring the average pore diameter of the separation membrane by the test of a pore diameter distribution tester;
(2) measuring the original peeling strength of the film layer and the supporting layer through a peeling test;
(3) measuring the initial color value of the separation membrane by a color measuring instrument;
(4) solvent resistance test: the separation membrane was soaked in 5% NaOH solution, 1% NaClO solution, 5% HCl solution at a constant temperature of 30 ℃ for 24H, respectively, then dried and subjected to peel strength test and color test again.
Indexes and performances of the separation membranes prepared in the embodiments 1 to 4 and the comparative examples 1 to 2 are shown in table 1, and a comparison table of test results shows that the separation membrane layers and the support structures in the embodiments 1 to 4 cannot be peeled before and after soaking, which shows that the peeling strength is extremely high and is not influenced by solvents; the Yellowness Index (YI) is used to characterize the degree of yellowing of a colorless, transparent, translucent, or near-white polymer material, and a larger value indicates that the polymer material has a darker color, indicating that the stability of the polymer material is more damaged. The Yellowness Index (YI) of the separation membrane of comparative example 1 is significantly higher than that of examples 1-4, which shows that the stability of the separation membrane after being soaked in a strong solvent is obviously damaged under the condition that polyvinylidene fluoride (PVDF) is not used as a support. The separation membranes of comparative examples 1-2 were peeled off due to the difference in the material of the support structure and the film layer.
TABLE 1 comparison of Performance of separation membranes
Claims (10)
1. A solvent resistant separation membrane comprising a support structure and a separation membrane layer, wherein: the support structure is a braid made of at least one vinylidene fluoride copolymer; the separation membrane layer is formed by uniformly coating a casting solution prepared from at least one polyvinylidene fluoride copolymer on the surface of the support structure.
2. The separation membrane of claim 1, wherein: the vinylidene fluoride copolymer is formed by copolymerizing a VDF monomer and a fluorine-containing comonomer, wherein the fluorine-containing comonomer is selected from at least one of a TrFE monomer, a CTFE monomer, a CFE monomer, an HFP monomer or a CDFE monomer.
3. The separation membrane of claim 1, wherein: the molecular weight of the polyvinylidene fluoride copolymer is 10-100 ten thousand, and the mole percentage of VDF monomer structural units in the polyvinylidene fluoride copolymer is 70-98%.
4. The separation membrane of claim 1, wherein: the support structure is a woven fabric prepared by melting, spinning and preparing at least one polyvinylidene fluoride copolymer.
5. The separation membrane of claim 4, wherein: the braided fabric is a hollow tubular structure or a planar structure.
6. The separation membrane of claim 1, wherein: the casting solution comprises 15-25% of vinylidene fluoride copolymer or a mixture of the vinylidene fluoride copolymer, 60-80% of organic solvent and 5-15% of pore-forming agent; the vinylidene fluoride copolymer mixture refers to a mixture of any two or more vinylidene fluoride copolymers.
7. The separation membrane of claim 6, wherein: the organic solvent is at least one of N, N-dimethylacetamide, N-methylpyrrolidone, dimethylformamide or dimethyl sulfoxide; the pore-forming agent is at least one selected from polyvinylpyrrolidone, polyethylene glycol, lithium chloride, polysorbate-80 or titanium dioxide.
8. The separation membrane of claim 1, wherein: the thickness of the separation film layer is 50-200 microns, and the average pore diameter is 0.05-10 microns.
9. The method for producing a separation membrane according to any one of claims 1 to 8, characterized in that: the preparation method comprises the following steps:
(1) preparing a support structure: selecting at least one polyvinylidene fluoride copolymer, melting, spinning and preparing into a braided fabric;
(2) preparing a separation membrane layer:
A. preparing a casting solution from 15-25% of vinylidene fluoride copolymer or a mixture of the vinylidene fluoride copolymer, 60-80% of organic solvent and 5-15% of pore-forming agent by mass;
B. extruding the membrane casting solution through a die head at 70-120 ℃, and uniformly coating the membrane casting solution on the surface of the support structure in the step (1) to form a hollow fiber membrane or a flat membrane;
C. rapidly immersing the hollow fiber membrane or the flat membrane into a condensation tank for gelling and curing to obtain a primary membrane;
D. and placing the primary membrane in a post-treatment tank for replacement to obtain the solvent-resistant separation membrane.
10. Use of a separation membrane according to claim 1, wherein: the separation membrane can be used as a filtration separation membrane for organic solvents, alkali liquor, etching solution and waste water.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101623601A (en) * | 2009-07-24 | 2010-01-13 | 泉州索爱膜科技开发有限公司 | Method for preparing compound hollow fibrous membrane |
| CN102085457A (en) * | 2009-12-07 | 2011-06-08 | 广州美能材料科技有限公司 | Method and device for preparing composite multilayer porous hollow fibrous membrane and product |
| CN102600733A (en) * | 2012-03-28 | 2012-07-25 | 天津工业大学 | Preparation method for homogeneously-enhanced polyvinylidene fluoride hollow fiber membrane |
| CN102764597A (en) * | 2012-08-01 | 2012-11-07 | 清华大学 | Method for preparing polyvinylidene fluoride ultra-filtration membranes |
| CN107596928A (en) * | 2017-10-12 | 2018-01-19 | 天津工业大学 | A kind of enhanced PVDF hollow-fibre membranes of homo-fibers and preparation method thereof |
-
2020
- 2020-09-18 CN CN202010986953.5A patent/CN114191997A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101623601A (en) * | 2009-07-24 | 2010-01-13 | 泉州索爱膜科技开发有限公司 | Method for preparing compound hollow fibrous membrane |
| CN102085457A (en) * | 2009-12-07 | 2011-06-08 | 广州美能材料科技有限公司 | Method and device for preparing composite multilayer porous hollow fibrous membrane and product |
| CN102600733A (en) * | 2012-03-28 | 2012-07-25 | 天津工业大学 | Preparation method for homogeneously-enhanced polyvinylidene fluoride hollow fiber membrane |
| CN102764597A (en) * | 2012-08-01 | 2012-11-07 | 清华大学 | Method for preparing polyvinylidene fluoride ultra-filtration membranes |
| CN107596928A (en) * | 2017-10-12 | 2018-01-19 | 天津工业大学 | A kind of enhanced PVDF hollow-fibre membranes of homo-fibers and preparation method thereof |
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