CN115414804A - Preparation method of ultrathin efficient separation membrane applied to water treatment - Google Patents
Preparation method of ultrathin efficient separation membrane applied to water treatment Download PDFInfo
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- CN115414804A CN115414804A CN202211238758.XA CN202211238758A CN115414804A CN 115414804 A CN115414804 A CN 115414804A CN 202211238758 A CN202211238758 A CN 202211238758A CN 115414804 A CN115414804 A CN 115414804A
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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
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
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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
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
- B01D69/125—In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction
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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
- B01D71/40—Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
- B01D71/42—Polymers of nitriles, e.g. polyacrylonitrile
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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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a preparation method of an ultrathin efficient separation membrane applied to water treatment, and belongs to the technical field of membrane preparation. A method for preparing an ultrathin high-efficiency separation membrane applied to water treatment is characterized in that a soaking method for loading an amine monomer in the traditional interfacial polymerization process is changed into a spin-coating method, and the subsequent acyl chloride monomer treatment is the same as that of the traditional method. The spin-coating interfacial polymerization can uniformly load piperazine on the surface of the base membrane instead of permeating into membrane pores, so that the lower surface of the separation layer has small protrusion, the water passing resistance is reduced, the physical anchoring effect between the piperazine and the base membrane is kept, the mechanical property of the membrane is ensured, and the piperazine is intensively distributed on the surface of the base membrane, so that the ultrathin polyamide separation layer is favorably obtained, and the flux is greatly improved under the condition of ensuring salt interception. Compared with the traditional amine monomer loading method of interfacial polymerization, the method provided by the invention can be completed in a short time, and integrates amine monomer loading, redundant reaction raw material removal and base film drying in one step, so that the method is fast and convenient, and the amine monomer consumption is greatly saved.
Description
Technical Field
The invention relates to the technical field of membrane preparation, in particular to a preparation method of an ultrathin high-efficiency separation membrane applied to water treatment.
Background
The nanofiltration membrane and the reverse osmosis membrane have the functions of separation, concentration, purification and refining, and have the characteristics of high efficiency, energy conservation, environmental protection, easy control and the like, so the nanofiltration membrane and the reverse osmosis membrane become one of the most important means in the separation science at present. The nanofiltration membrane and the reverse osmosis transparent membrane are mostly composite membranes composed of porous and nonselective support membranes and ultrathin functional layers compounded on the surfaces of the support membranes for separation, and an interface polymerization method is always a main preparation method of the composite membranes.
Interfacial polymerization utilizes two highly reactive monomers to polymerize at the interface of two incompatible solvents (two phases, typically an aqueous phase and an organic phase). The specific method is that the supporting basement membrane is firstly immersed into the water solution containing active amine monomer, then the membrane is immersed into another oil phase solution containing active acyl chloride monomer, at the moment, the contact of the two monomers initiates interfacial polymerization reaction on the supporting membrane to form a compact polyamide separation skin layer, and finally, heat treatment is carried out.
However, the mutual balance and restriction between membrane permeability and separation selectivity is an inherent obstacle to the application of composite membranes, and the preparation of composite membranes with both high solvent permeability and high solute selectivity makes the separation process operate at a low energy consumption level, which is of great significance.
The existing research controls the reaction conditions such as low temperature and external voltage, changes the property of a basement membrane or introduces an intermediate layer, adds functional nano materials and the like, and regulates and controls the thickness, the pore diameter and the specific surface area of a polyamide separation layer so as to improve the flux of a composite membrane and ensure the interception performance, but the research or the steps are complex, or the materials are expensive, and the industrialization is difficult. In the existing research, the improvement of the loading method of the aqueous phase amine monomer is less concerned to improve the performance of the composite membrane, and the research shows that the reaction concentration of the amine monomer is increased and the uniform distribution of the amine monomer is improved, so that the ultra-thin polyamide skin layer with uniform pore size distribution and no defect is obtained.
Spin coating is a method of coating by adding a solution to a stationary substrate and then rotating the substrate or directly adding a solution to a rotating substrate. The spin coating method can ensure that the load substance is quickly and uniformly distributed on the substrate and can be automatically operated under the combined action of electrostatic action, centrifugal force, air shearing force and viscous force. Spin coating can be accomplished in about 30 seconds and the above forces are also responsible for spin coating being orders of magnitude more efficient than dip coating. The spin-coating method has the advantages of rapidness, uniformity and the like, so that the amine monomer solution is loaded on the base film through the spin-coating method to achieve uniform distribution of amine, the contact time of the amine monomer and the base film is short at a high rotating speed, and the amine monomer is mainly distributed on the surface of the base film to reduce the permeation of the amine monomer in a film hole; in view of the above, we propose a method for preparing an ultrathin and efficient separation membrane based on spin-coating interfacial polymerization for water treatment.
Disclosure of Invention
The invention aims to provide a preparation method of an ultrathin high-efficiency separation membrane applied to water treatment, which is used for further improving the flux of a composite membrane by changing a loading method of an amine monomer (piperazine) in the traditional interfacial polymerization process from a soaking method into a spin-coating method and controlling the load and distribution of the amine monomer by controlling the spin-coating rotating speed, the amount of a spin-coating aqueous solution and the concentration of the spin-coating solution.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of an ultrathin high-efficiency separation membrane applied to water treatment adopts a spin-coating interfacial polymerization method and specifically comprises the following steps:
s1, fixing a base film on a glass plate, and then installing the glass plate into a spin coater;
s2, starting the spin coater, adjusting the spin coater to a proper rotating speed, and driving the base film to rotate on the spin coater at a constant speed;
s3, injecting a proper amount of water-soluble monomer solution from the right upper side of the center of the base film when the base film rotates to obtain the base film loaded with the amine monomer;
s4, taking the base film loaded with the monomers and treated in the S3 out of the spin coating instrument, and pouring the oil phase solution into the surface of the base film without other operations;
and S5, after the oil phase reacts on the base membrane for a proper time, pouring out the oil phase, and thermally crosslinking the treated base membrane for a certain time at a proper temperature to obtain the composite nanofiltration membrane.
Preferably, the base membrane mentioned in S1 is a polysulfone membrane, a polyacrylonitrile membrane, a polyethersulfone membrane or a Kevlar base membrane.
Preferably, the spin coater mentioned in said S2 is suitably rotated at 500rpm to 5000rpm.
Preferably, the water-soluble monomer mentioned in S3 is one or more of piperazine, polyethyleneimine, grafted polyethyleneimine, p-phenylenediamine, m-phenylenediamine, piperidine, and β -cyclodextrin amine monomer;
preferably, the oil phase solution mentioned in S4 is obtained by dissolving a polybasic acid chloride monomer in the oil phase solvent, wherein the polybasic acid chloride monomer is one or more of trimesoyl chloride, isophthaloyl chloride, biphenyltetracarbonyl chloride (BTEC), 5-isocyanate isophthaloyl chloride, 5-oxoformyl chloride isophthaloyl chloride, and 2,4, 6-pyridine triacyl chloride. The solvent of the oil phase mentioned in S3 is one or more of n-hexane, n-heptane, n-pentane, cyclohexane or Isopar-G.
Preferably, the time of the oil phase mentioned in S5 on the basement membrane is 10S-10 min, the temperature of the heat cross-linking treatment of the basement membrane is 30-100 ℃, and the time of the heat cross-linking treatment is 0-20 min.
Compared with the prior art, the invention provides a preparation method of an ultrathin high-efficiency separation membrane applied to water treatment, which has the following beneficial effects:
the composite membrane prepared by spin-coating interfacial polymerization can be applied to the fields of seawater desalination, water purification, wastewater treatment, lithium-magnesium separation and the like, and compared with the prior art, the composite membrane has the following beneficial effects:
(1) According to the invention, the water-soluble monomer is loaded on the base film through spin coating, the time consumption is short, extra steps of removing redundant raw materials and drying the base film are not needed, the operation is fast and convenient, and the effect of simplifying the process flow is achieved;
(2) According to the invention, the water-soluble monomer is loaded on the base film through spin coating, so that the use amount of the amine monomer is greatly saved, and the preparation cost of the film can be effectively reduced;
(3) According to the invention, the load and distribution of the amine monomer on the base film are controlled by controlling the spin-coating rotating speed, the spin-coating amount and the concentration of the amine monomer, so that the performance of the composite film can be regulated and controlled;
(4) According to the invention, the water-soluble monomer is loaded on the base membrane through spin coating, and the amine monomer is mainly loaded on the surface of the base membrane, so that an ultrathin polyamide separation layer with the thickness of less than 10nm is formed, the flux is greatly improved under the condition of salt interception, meanwhile, the protrusion size of the lower surface of the separation layer is reduced, the water resistance is reduced, the anchoring effect between the separation layer and the base membrane is kept, and the mechanical property of the membrane is ensured.
In conclusion, compared with the existing design, the operation method is faster and more convenient, the production cost can be effectively reduced, and the development of the application of the composite membrane in the industry is facilitated.
Drawings
FIG. 1 is a schematic diagram illustrating the research and performance of the spin-coating rotation speed for preparing the composite nanofiltration membrane by spin-coating interfacial polymerization in an embodiment of the method for preparing the ultrathin high-efficiency separation membrane for water treatment provided by the invention;
FIG. 2 is a schematic diagram of the research and performance of the spinning amount of piperazine for preparing the composite nanofiltration membrane by spinning interfacial polymerization in an embodiment of the preparation method of the ultrathin high-efficiency separation membrane applied to water treatment provided by the invention;
FIG. 3 is a schematic diagram of the research and performance of piperazine concentration of a composite nanofiltration membrane prepared by spin-coating interfacial polymerization in an embodiment of the preparation method of an ultrathin high-efficiency separation membrane applied to water treatment provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1:
a preparation method of an ultrathin high-efficiency separation membrane applied to water treatment adopts a spin-coating interfacial polymerization method and specifically comprises the following steps:
s1, fixing a base film on a glass plate, and then installing the glass plate into a spin coater;
the base membrane mentioned in S1 is a polysulfone membrane, a polyacrylonitrile membrane, a polyether sulfone membrane or a Kevlar base membrane;
s2, starting the spin coater, adjusting the spin coater to a proper rotating speed, and driving the base film to rotate on the spin coater at a constant speed;
the proper rotating speed of the spin coater mentioned in the S2 is 500 rpm-5000 rpm;
s3, injecting a proper amount of water-soluble monomer solution from the right upper side of the center of the base film when the base film rotates to obtain the base film loaded with the amine monomer;
the water-soluble monomer mentioned in S3 is one or more of piperazine, polyethyleneimine, grafted polyethyleneimine, p-phenylenediamine, m-phenylenediamine, piperidine and beta-cyclodextrin amine monomers;
s4, taking the base film loaded with the monomers processed in the S3 out of the spin coating instrument, and pouring the oil phase solution into the surface of the base film without other operations;
the oil phase solution mentioned in S4 is obtained by dissolving a polybasic acyl chloride monomer in an oil phase solvent, wherein the polybasic acyl chloride monomer is one or more of trimesoyl chloride, isophthaloyl chloride, biphenyltetracarbonyl chloride (BTEC), 5-isocyanate isophthaloyl chloride, 5-oxoformyl chloride isophthaloyl chloride and 2,4, 6-pyridine triacyl chloride; the solvent of the oil phase mentioned in S4 is one or more of n-hexane, n-heptane, n-pentane, cyclohexane or Isopar-G.
S5, after the oil phase reacts on the base membrane for a proper time, pouring out the oil phase, and thermally crosslinking the treated base membrane for a certain time at a proper temperature to obtain the composite nanofiltration membrane;
the time of the oil phase mentioned in S5 on the basement membrane is 10S-10 min, the temperature of the heat crosslinking treatment of the basement membrane is 30-100 ℃, and the time of the heat crosslinking treatment is 0-20 min.
The composite membrane prepared by spin-coating interfacial polymerization can be applied to the fields of seawater desalination, water purification, wastewater treatment, lithium-magnesium separation and the like, compared with the prior art, the composite membrane prepared by spin-coating interfacial polymerization has the advantages that water-soluble monomers are loaded on the base membrane by spin coating, the time consumption is short, extra steps of removing redundant raw materials and drying the base membrane are not needed, the composite membrane is quick and convenient, and the effect of simplifying the process flow is achieved; according to the invention, the water-soluble monomer is loaded on the base film through spin coating, so that the use amount of the amine monomer is greatly saved, and the preparation cost of the film can be effectively reduced; according to the invention, the load and distribution of the amine monomer on the base film are controlled by controlling the spin-coating rotating speed, the spin-coating amount and the concentration of the amine monomer, so that the performance of the composite film can be regulated and controlled; according to the invention, the water-soluble monomer is loaded on the base membrane through spin coating, and the amine monomer is mainly loaded on the surface of the base membrane, so that an ultrathin polyamide separation layer with the thickness of less than 10nm is formed, the flux is greatly improved under the condition of salt interception, the protrusion size of the lower surface of the separation layer is reduced, the water resistance is reduced, the anchoring effect between the separation layer and the base membrane is kept, and the mechanical property of the membrane is ensured. Compared with the existing design, the operation method is faster and more convenient, can effectively reduce the production cost, and is beneficial to expanding the application of the composite membrane in industry.
Example 2:
referring to fig. 1-3, the embodiment 1 is different from the embodiment in that the method specifically includes the following steps:
(1) Preparing 0.3g/100mL piperazine water solution and 0.1g/100mL trimesoyl chloride normal hexane solution, and soaking the polysulfone basal membrane for 24 hours in advance;
(2) Fixing a polysulfone base film on a glass plate, then installing the glass plate in a spin coater, starting a set spin coating program, injecting 1mL of piperazine aqueous solution from the right upper side of the center of the base film when the spin coating rotating speed reaches 3500rpm, and taking out the base film after the program is finished;
(3) Fixing the base membrane in a membrane component, pouring 5mL of trimesoyl chloride n-hexane solution, reacting for 1 minute, pouring out the reaction solution, placing the reaction solution in an oven at 70 ℃ for thermal crosslinking for 3 minutes, and then obtaining the composite nanofiltration membrane.
Testing the water permeability of the composite membrane:
the composite membrane is arranged in a membrane separation cross flow device, after pre-pressing for a certain time, the performance of the composite membrane is stable, at the moment, water flux evaluation is carried out on the composite membrane, the water flux refers to the volume of water which permeates through a unit membrane area (A) in unit time (t) and unit pressure (P) under a certain condition, and the water flux can be calculated by the following formula:
and (4) testing the salt rejection performance of the composite membrane. When the brine passes through the composite membrane, the separation of the brine is realized under the action of external thrust such as pressure difference, concentration difference and the like existing on two sides of the membrane, and the separation can be realized through the concentration (C) of the solute in the stock solution f ) And the solute concentration (C) of the filtrate p ) The comparison between the two can be evaluated, and can be specifically calculated by the following formula:
the flux of the composite nanofiltration membrane obtained in the embodiment is 36.1L m -2 h -1 bar -1 The rejection rate of the sodium sulfate is 96.2%, and the flux is obviously improved compared with that of a commercial nanofiltration membrane.
Example 3:
referring to fig. 1-3, the embodiment 1-2 is different from the above embodiment in that the method specifically includes the following steps:
(1) Preparing 0.3g/100mL piperazine water solution and 0.1g/100mL trimesoyl chloride n-hexane solution, and soaking the polyether sulfone basement membrane for 24 hours in advance;
(2) Fixing a polyether sulfone base film on a glass plate, then installing the glass plate in a spin coater, starting a set spin coating program, injecting 1mL of piperazine aqueous solution from the right upper side of the center of the base film when the spin coating rotation speed reaches 3500rpm, and taking out the base film after the program is finished;
(3) Fixing the base membrane in a membrane component, pouring 5mL of trimesoyl chloride n-hexane solution, reacting for 1 minute, pouring out the reaction solution, placing the reaction solution in an oven at 70 ℃ for thermal crosslinking for 3 minutes, and then obtaining the composite nanofiltration membrane.
The flux of the composite nanofiltration membrane obtained in example 3 is 23.4L m -2 h -1 bar -1 The sodium sulfate rejection was 96.0%, and the flux boost was less compared to example 2.
Example 4:
referring to fig. 1-3, embodiments 1-3 are different in that they specifically include the following steps:
(1) Preparing 0.3g/100mL piperazine water solution and 0.1g/100mL trimesoyl chloride normal hexane solution, and soaking the Kevlar basement membrane for 24 hours in advance;
(2) Fixing a Kevlar base film on a glass plate, then installing the glass plate in a spin coater, starting a set spin coating program, injecting 1mL of piperazine aqueous solution from the right upper side of the center of the base film when the spin coating speed reaches 3500rpm, and taking out the base film after the program is finished;
(3) Fixing the base membrane in a membrane component, pouring 5mL of trimesoyl chloride n-hexane solution, reacting for 1 minute, pouring out the reaction solution, placing the reaction solution in an oven at 70 ℃ for thermal crosslinking for 3 minutes, and then obtaining the composite nanofiltration membrane.
The flux of the composite nanofiltration membrane obtained in example 4 is 37.9L m -2 h -1 bar -1 The sodium sulfate rejection was 97.5%, which increased both flux and salt rejection compared to example 2.
Example 5:
referring to fig. 1-3, embodiments 1-4 are different in that they specifically include the following steps:
(1) Preparing 0.3g/100mL piperazine water solution and 0.1g/100mL trimesoyl chloride normal hexane solution, and soaking the polyacrylonitrile-based membrane for 24 hours in advance;
(2) Fixing a polyacrylonitrile base film on a glass plate, then installing the polyacrylonitrile base film in a spin coater, starting a set spin coating program, injecting 1mL of piperazine aqueous solution from the position right above the center of the base film when the spin coating rotating speed reaches 3500rpm, and taking out the base film after the program is finished;
(3) Fixing the base membrane in a membrane component, pouring 5mL of trimesoyl chloride n-hexane solution, reacting for 1 minute, pouring out the reaction solution, placing the reaction solution in an oven at 70 ℃ for thermal crosslinking for 3 minutes, and then obtaining the composite nanofiltration membrane.
The flux of the composite nanofiltration membrane obtained in example 5 is 41.7L m -2 h -1 bar -1 The sodium sulfate rejection rate is 96.2%, and compared with example 2, the flux is obviously improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A preparation method of an ultrathin high-efficiency separation membrane applied to water treatment is characterized by adopting a spin-coating interfacial polymerization method and specifically comprising the following steps:
s1, fixing a base film on a glass plate, and then installing the glass plate into a spin coater;
s2, starting the spin coater, adjusting the spin coater to a proper rotating speed, and driving the base film to rotate on the spin coater at a constant speed;
s3, when the base film rotates, injecting a proper amount of water-soluble monomer solution from the right upper side of the center of the base film to obtain the base film loaded with the amine monomer;
s4, taking the base film loaded with the monomers and treated in the S3 out of the spin coating instrument, and pouring the oil phase solution into the surface of the base film without other operations;
and S5, after the oil phase reacts on the base membrane for a proper time, pouring out the oil phase, and carrying out thermal crosslinking on the treated base membrane for a certain time at a proper temperature to obtain the composite nanofiltration membrane.
2. The method for preparing the ultrathin efficient separation membrane applied to the water treatment as claimed in claim 1, wherein the method comprises the following steps: the base membrane mentioned in S1 is a polysulfone membrane, a polyacrylonitrile membrane, a polyether sulfone membrane or a Kevlar base membrane.
3. The preparation method of the ultrathin high-efficiency separation membrane applied to water treatment, as claimed in claim 1, is characterized in that: the spin coater mentioned in said S2 is suitably rotated at 500rpm to 5000rpm.
4. The preparation method of the ultrathin high-efficiency separation membrane applied to water treatment, as claimed in claim 1, is characterized in that: the water-soluble monomer mentioned in S3 is one or more of piperazine, polyethyleneimine, grafted polyethyleneimine, p-phenylenediamine, m-phenylenediamine, piperidine and beta-cyclodextrin amine monomer.
5. The method for preparing the ultrathin efficient separation membrane applied to the water treatment as claimed in claim 1, wherein the method comprises the following steps: the oil phase solution mentioned in S4 is obtained by dissolving a polybasic acyl chloride monomer in an oil phase solvent, wherein the polybasic acyl chloride monomer is one or more of trimesoyl chloride, isophthaloyl chloride, biphenyltetracarbonyl chloride (BTEC), 5-isocyanate isophthaloyl chloride, 5-oxoformyl chloride isophthaloyl chloride and 2,4, 6-pyridine triacyl chloride. The solvent of the oil phase mentioned in S4 is one or more of n-hexane, n-heptane, n-pentane, cyclohexane or Isopar-G.
6. The preparation method of the ultrathin high-efficiency separation membrane applied to water treatment, as claimed in claim 1, is characterized in that: the time of the oil phase mentioned in the S5 on the basement membrane is 10S-10 min, the temperature of the heat cross-linking treatment of the basement membrane is 30-100 ℃, and the time of the heat cross-linking treatment is 0-20 min.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108404681A (en) * | 2018-03-22 | 2018-08-17 | 郑州大学 | A kind of organic solvent nanofiltration composite membrane and preparation method thereof |
| CN108452689A (en) * | 2017-03-06 | 2018-08-28 | 青岛致用新材料科技有限公司 | Highly selective full alicyclic polyamide NF membrane of one kind and preparation method thereof |
| CN113441016A (en) * | 2021-07-06 | 2021-09-28 | 华侨大学 | Method for preparing composite nanofiltration membrane by interfacial polymerization based on step-by-step spin coating method |
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2022
- 2022-10-11 CN CN202211238758.XA patent/CN115414804A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108452689A (en) * | 2017-03-06 | 2018-08-28 | 青岛致用新材料科技有限公司 | Highly selective full alicyclic polyamide NF membrane of one kind and preparation method thereof |
| CN108404681A (en) * | 2018-03-22 | 2018-08-17 | 郑州大学 | A kind of organic solvent nanofiltration composite membrane and preparation method thereof |
| CN113441016A (en) * | 2021-07-06 | 2021-09-28 | 华侨大学 | Method for preparing composite nanofiltration membrane by interfacial polymerization based on step-by-step spin coating method |
Non-Patent Citations (1)
| Title |
|---|
| ZHUN ZHOU ET AL.: "Ultrathin polyamide membranes enabled by spin-coating assisted interfacial polymerization for high-flux nanofiltration", 《SEPARATION AND PURIFICATION TECHNOLOGY》 * |
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Application publication date: 20221202 |