CN-121972026-A - Asymmetric multichannel metal film and preparation method thereof

CN121972026ACN 121972026 ACN121972026 ACN 121972026ACN-121972026-A

Abstract

The invention discloses an asymmetric multichannel metal membrane and a preparation method thereof, wherein the asymmetric multichannel metal membrane comprises a metal carrier with a channel, a separation layer is arranged on the inner wall of the channel, the raw material of the metal carrier at least comprises metal powder A, the metal powder A is at least one of stainless steel powder and nickel metal powder, the raw material of the separation layer at least comprises metal powder B, and the metal powder B is at least one of stainless steel powder, nickel metal powder, titanium alloy powder and nickel alloy powder. The asymmetric multichannel metal membrane has multiple channels, so that the effective filtering area is greatly increased, the separation layer and the metal carrier are tightly combined, the use stability is good, the preparation process is simple, the condition controllability is high, and the separation layer is uniform and complete and has controllable thickness.

Inventors

YU JIAN
XU MINGGUI
WANG ZHONGYANG
LI XINYUE
ZHU TAIHUA

Assignees

南京工业大学
南京工业大学张家港产业学院

Dates

Publication Date: 20260505
Application Date: 20260316

Claims (10)

1. An asymmetric multi-channel metal membrane is characterized by comprising a metal carrier with a channel, wherein a separation layer is arranged on the inner wall of the channel; The raw materials of the metal carrier at least comprise metal powder A, wherein the metal powder A is at least one of stainless steel powder and nickel metal powder; The raw materials of the separating layer at least comprise metal powder B, wherein the metal powder B is at least one of stainless steel powder, nickel metal powder, titanium alloy powder and nickel alloy powder.
2. The asymmetric multi-channel metal membrane of claim 1 wherein the pore size of the metal support is 3 μm to 11 μm, the pore size of the separation layer is 0.8 μm to 4.5 μm, the pore size of the separation layer is smaller than the pore size of the metal support, and/or, The thickness of the separation layer is 60-90 μm.
3. A method of making an asymmetric multi-channel metal membrane of claim 1, comprising the steps of: Taking an inner die, coating ceramic slurry on the surface of the inner die, and forming an isolation layer after drying to obtain a pretreatment inner die; Taking an outer mold, placing a fixed mold with a plurality of pore canals at one end of the outer mold, inserting a pretreatment inner mold into the outer mold and placing the pretreatment inner mold in the pore canals of the fixed mold, so that a cavity is formed between the outer mold and the pretreatment inner mold; filling metal powder A into the cavity, and mounting a fixed mould at the other end of the outer mould for sealing to obtain a metal blank; Carrying out heat treatment on the metal blank, and then cleaning and drying to obtain a metal carrier with channels; Mixing metal powder B and a binder to prepare suspension, introducing the suspension into a channel of a metal carrier, vacuum sucking the suspension from the outer wall of the metal carrier to the inner wall of the channel of the metal carrier to form a coating film, and then performing heat treatment to the inner wall of the channel of the metal carrier to form a separation layer to obtain the asymmetric multi-channel metal film.
4. The method for producing an asymmetric multi-channel metal membrane according to claim 3, wherein the ceramic slurry comprises 30 to 50% by mass of ceramic powder having a particle diameter of 4 μm to 5 μm and a binder solution of at least one of 1 to 5% by mass of polyvinyl butyral solution, polyvinyl alcohol solution, and methylcellulose solution, and/or wherein the ceramic powder is at least one of alumina, zirconia, and titania, The ceramic slurry has a coating thickness of 20 μm to 100 μm, and/or, The binder is at least one of polyvinyl butyral solution, polyvinyl alcohol solution and methyl cellulose solution with the mass fraction of 1-5 percent, and/or, The mass fraction of the metal powder B in the suspension is 15-50%, and/or, The particle size of the metal powder A is 5 μm to 500 μm, and/or, The particle size of the metal powder B is 1-20 mu m.
5. The method for producing an asymmetric multi-channel metal membrane as claimed in claim 3, wherein in the step of producing the pretreatment inner die, the drying temperature is 65 ℃ to 75 ℃ for 1.5h to 2.5h, and/or, The heat treatment operation of the metal blank body is that under the conditions of vacuum, argon or hydrogen, the temperature is firstly increased to 400-600 ℃ at the temperature of 2-5 ℃ per minute, the temperature is kept for 0.5-1.5 h, then the temperature is increased to 1000-1200 ℃ at the temperature increasing rate of 5-10 ℃ per minute, the temperature is kept for 1-3 h, and/or, The vacuum suction is operated such that the suspension is sucked under a vacuum of 0.08MPa to 0.1MPa for a time of 60s to 600s, and/or, After the vacuum pumping operation is finished, the operation of heat treatment is that the temperature is raised to 950-1100 ℃ at the temperature rising rate of 2-5 ℃ per minute under the conditions of vacuum, reduction or inert atmosphere, and the temperature is kept for 1-3 h.
6. The method for producing an asymmetric multi-channel metal membrane as claimed in claim 3, wherein the diameter of said inner die is 2mm to 50mm, and/or, The inner diameter of the outer mould is 10mm-200mm, and/or, The number of the pore canal of the fixed mould is 3-37.
7. A method of making an asymmetric multi-channel metal membrane of claim 1, comprising the steps of: Taking an inner die, coating ceramic slurry on the surface of the inner die, and forming an isolation layer after drying to obtain a pretreatment inner die; mixing metal powder B and a binder to prepare a suspension, and coating the suspension on an isolating layer of a pretreatment internal mold to obtain the treated internal mold; Taking an outer mold, placing a fixed mold with a plurality of pore canals at one end of the outer mold, inserting the treated inner mold into the outer mold and placing the treated inner mold in the pore canals of the fixed mold, so that a cavity is formed between the outer mold and the treated inner mold; filling metal powder A into the cavity, and mounting a fixed mould at the other end of the outer mould for sealing to obtain a metal blank; and carrying out heat treatment on the metal blank, and then cleaning and drying to obtain the asymmetric multi-channel metal film.
8. The method according to claim 7, wherein the ceramic slurry comprises 30-50% by mass of ceramic powder, 4-5 μm of particle size of ceramic powder, at least one of alumina, zirconia and titania, and a binder solution, at least one of 1-5% by mass of polyvinyl butyral solution, polyvinyl alcohol solution and methylcellulose solution, The ceramic slurry has a coating thickness of 20 μm to 100 μm, and/or, The binder is at least one of polyvinyl butyral solution, polyvinyl alcohol solution and methyl cellulose solution with the mass fraction of 1-5 percent, and/or, The mass fraction of the metal powder B in the suspension is 15-50%, and/or, The particle size of the metal powder A is 5 μm to 500 μm, and/or, The particle size of the metal powder B is 1 μm to 20 μm, and/or, The particle sizes of the metal powder A and the metal powder B differ by less than or equal to 50 mu m.
9. The method for producing an asymmetric multi-channel metal membrane as claimed in claim 7, wherein in the step of producing the pretreatment inner die, the drying temperature is 65 ℃ to 75 ℃ for 1.5h to 2.5h, and/or, The heat treatment operation of the metal blank body is that the temperature is raised to 950-1100 ℃ at the temperature rising rate of 2-5 ℃ per minute under the conditions of vacuum, reduction or inert atmosphere, and the temperature is kept for 1-3 h.
10. The method for producing an asymmetric multi-channel metal membrane as claimed in claim 7, wherein the diameter of the inner die is 2mm to 50mm, and/or, The inner diameter of the outer mould is 10mm-200mm, and/or, The number of the pore canal of the fixed mould is 3-37.

Description

Asymmetric multichannel metal film and preparation method thereof Technical Field The invention belongs to the technical field of membrane materials, and particularly relates to an asymmetric multichannel metal membrane and a preparation method thereof. Background The metal film has the advantages of high mechanical strength, good heat conduction performance, weldability, good sealing performance, good thermal stability, chemical stability and the like, and is widely applied to high-temperature and high-pressure industry. In the industrial filtration application, as the filtration time increases, impurities deposited on the outer surface of the metal film gradually form filter cakes to block the pore channels of the metal film, so that the metal film needs to be frequently cleaned and replaced, the working efficiency of the metal film is reduced, and the operation cost is increased. In order to improve the working efficiency of the metal membrane and the filtration throughput, researchers have developed multichannel metal membranes. The multichannel metal film has high specific surface area and high flux, can effectively improve the filtration treatment capacity, but the existing multichannel metal film is easy to damage in the use process, and the stability is required to be further improved. Disclosure of Invention The invention aims to provide an asymmetric multi-channel metal film and a preparation method thereof, the process is simple and convenient to operate, the parameters are easy to control, the cost is low, and the prepared asymmetric multi-channel metal film has high flux characteristics, uniform and compact film layer and adjustable thickness, and has good industrial application prospect. In order to achieve the above object, a specific embodiment of the present invention provides the following technical solution: An asymmetric multi-channel metal membrane comprising a metal carrier with channels, wherein a separation layer is arranged on the inner wall of each channel; The raw materials of the metal carrier at least comprise metal powder A, wherein the metal powder A is at least one of stainless steel powder and nickel metal powder; The raw materials of the separating layer at least comprise metal powder B, wherein the metal powder B is at least one of stainless steel powder, nickel metal powder, titanium alloy powder and nickel alloy powder. In one or more embodiments of the invention, the pore size of the metal support is 3 μm to 11 μm, the pore size of the separation layer is 0.8 μm to 4.5 μm, the pore size of the separation layer is smaller than the pore size of the metal support, and/or, The thickness of the separation layer is 60-90 μm. The technical scheme provided by the other specific embodiment of the invention is as follows: The preparation method of the asymmetric multichannel metal film comprises the following steps: Taking an inner die, coating ceramic slurry on the surface of the inner die, and forming an isolation layer after drying to obtain a pretreatment inner die; Taking an outer mold, placing a fixed mold with a plurality of pore canals at one end of the outer mold, inserting a pretreatment inner mold into the outer mold and placing the pretreatment inner mold in the pore canals of the fixed mold, so that a cavity is formed between the outer mold and the pretreatment inner mold; filling metal powder A into the cavity, and mounting a fixed mould at the other end of the outer mould for sealing to obtain a metal blank; Carrying out heat treatment on the metal blank, and then cleaning and drying to obtain a metal carrier with channels; Mixing metal powder B and a binder to prepare suspension, introducing the suspension into a channel of a metal carrier, vacuum sucking the suspension from the outer wall of the metal carrier to the inner wall of the channel of the metal carrier to form a coating film, and then performing heat treatment to the inner wall of the channel of the metal carrier to form a separation layer to obtain the asymmetric multi-channel metal film. In one or more embodiments of the present invention, the ceramic slurry includes 30% -50% by mass of ceramic powder having a particle size of 4 μm to 5 μm and at least one of alumina, zirconia, and titania, and a binder solution of at least one of 1% -5% by mass of polyvinyl butyral solution, polyvinyl alcohol solution, and methylcellulose solution, and/or, The binder is at least one of polyvinyl butyral solution, polyvinyl alcohol solution and methyl cellulose solution with the mass fraction of 1-5 percent, and/or, The mass fraction of the metal powder B in the suspension is 15-50%, and/or, The particle size of the metal powder A is 5 μm to 500 μm, and/or, The particle size of the metal powder B is 1-20 mu m. In one or more embodiments of the present invention, the drying temperature is 65 ℃ to 75 ℃ and the time is 1.5h to 2.5h, and/or, The heat treatment operation of the metal blank body is that under the conditions