CN110038449B - Metal micropore array filter membrane and manufacturing method thereof - Google Patents
Metal micropore array filter membrane and manufacturing method thereof Download PDFInfo
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- CN110038449B CN110038449B CN201810034525.5A CN201810034525A CN110038449B CN 110038449 B CN110038449 B CN 110038449B CN 201810034525 A CN201810034525 A CN 201810034525A CN 110038449 B CN110038449 B CN 110038449B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
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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
- B01D67/0039—Inorganic membrane manufacture
- B01D67/0053—Inorganic membrane manufacture by inducing porosity into non porous precursor membranes
- B01D67/006—Inorganic membrane manufacture by inducing porosity into non porous precursor membranes by elimination of segments of the precursor, e.g. nucleation-track membranes, lithography or laser methods
- B01D67/0062—Inorganic membrane manufacture by inducing porosity into non porous precursor membranes by elimination of segments of the precursor, e.g. nucleation-track membranes, lithography or laser methods by micromachining techniques, e.g. using masking and etching steps, photolithography
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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
- B01D71/02—Inorganic material
- B01D71/022—Metals
Abstract
The invention provides a metal micropore array filtering membrane structure and a manufacturing method thereof. The filtering membrane comprises a membrane surface with a hill-shaped rough micro-nano structure and a micropore array. The manufacturing method comprises providing a metal foil; after cleaning, etching a hilly micro-nano structure on the metal surface by using a laser beam in a scanning mode; a laser beam is then used to drill a hole in the scanned area to create an array of micro-holes. The method uses laser beam processing to construct a hilly micro-nano structure and a micropore array on the metal surface, and obtains the metal micropore array filtering membrane without any chemical modification process. The structure and the manufacturing method are simple, economic and environment-friendly, and have wide application prospect in the field of sewage treatment.
Description
Technical Field
The invention relates to a metal micropore array filter membrane and a manufacturing method thereof.
Background
In the oil-water separation of the special-wettability filtering membrane, the essence of achieving the oil-water separation is the wetting behavior generated at the contact interface of a solid phase, a gas phase, a water phase and an oil phase, and the key of the oil-water separation is to construct the surface of the filtering membrane with super-wettability. The main factors influencing the surface wettability of the solid material are two factors: the surface roughness of the solid material and the surface energy of the solid material surface substance are high and low. Therefore, in most of the articles describing the manufacture of filtration membranes for oil-water separation, the construction of micro-roughness structures and the imparting of hydrophilic and hydrophobic properties to the surface to obtain a filtration surface with super-wetting properties are important.
The metal material has the characteristics of high plasticity, high thermal stability, low manufacturing cost and the like. Therefore, the oil-water separation filtration membrane using a metal material including a metal mesh, a metal pore, etc. as a substrate and imparting a specific wettability to the surface thereof by physical and chemical methods is favored by many scientists. In 2004, feng et al firstly produced a polytetrafluoroethylene coating stainless steel mesh membrane with super-hydrophobic and super-oleophilic properties by a spray drying method to realize oil-water separation. Hitherto, various methods of structuring surface topography (chemical etching, chemical growth, electrodeposition, etc.) and methods of surface modification and coating have been successfully applied to the manufacture of metal filtration membranes. In this respect, it is the metal microporous array filter membrane manufacturing aspect that is not really applied.
Therefore, how to effectively apply the metal micro-pore array filtering membrane for separating oil and water mixture and treating sewage, the manufacturing method thereof and the like are still technical problems which need to be solved in the technical field.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a metal micro-pore array filtration membrane and a manufacturing method thereof, wherein the membrane surface has super-hydrophilic and underwater super-oleophobic properties, is suitable for various metals, and can be effectively applied to separation of oil and water mixture and sewage treatment.
In order to achieve the above and other related objects, the invention provides a metal micropore array filtering membrane, which comprises a filtering membrane body, wherein the surface of the filtering membrane body is provided with parallel groove arrays, the parallel groove arrays are two groups of parallel grooves which are perpendicular to each other, a micropore array composed of micropores is arranged on the filtering membrane body, and the parallel groove arrays and the micropore array jointly form a hilly micro-nano structure of the filtering membrane.
As a further optimization of the technical scheme, the width of the grooves in the parallel grooves is 10-30 μm, and the depth of the grooves is 10-40 μm.
As a further optimization of the technical scheme, the distance between two adjacent parallel grooves in the parallel groove array is 50-200 mu m.
As a further optimization of the technical scheme, the diameter of each micropore in the micropore array is 20-100 microns, and the distance between every two adjacent micropores in the micropore array is 50-200 microns.
A manufacturing method of a metal micro-pore array filtering membrane comprises the above metal micro-pore array filtering membrane, and the manufacturing method comprises the following steps:
s1, providing a metal foil;
s2, soaking the metal foil provided in the step S1 in absolute ethyl alcohol and deionized water, ultrasonically cleaning for 5 minutes, and placing in nitrogen flow for drying;
s3, scanning the surface of the metal foil by using a laser beam to form a hill-shaped micro-nano structure on the surface of the metal foil;
s4, drilling holes in the scanning area by using laser beams to obtain a micropore array;
and S5, cleaning the metal film with the hilly micro-nano structure and the micro-pore array after the step S4, soaking the metal film in absolute ethyl alcohol and deionized water for ultrasonic cleaning for 5 minutes during cleaning, and placing the metal film in nitrogen flow for drying.
As a further optimization of the technical scheme, the metal foil is one of brass, red copper, aluminum and titanium.
As a further optimization of the technical scheme, the thickness of the metal foil is 40-80 μm.
The invention has the following beneficial effects:
the filtering membrane body is provided with a membrane surface with a hill-shaped micro-nano structure and a micropore array, and the structure is simple and periodic. The micro-nano structure and the micro-pore array with rough surfaces are constructed by laser scanning and drilling methods without any chemical modification process, and the manufacturing method is simple, economic and environment-friendly. The membrane surface has super-hydrophilic and underwater super-oleophobic performances, is suitable for various metals, and can be effectively applied to separation of oil and water mixtures and sewage treatment.
Drawings
FIG. 1 is a schematic structural diagram of a metal micro-pore array filter membrane according to the present invention shown under a microscope.
FIG. 2 is a schematic view showing the surface structure of a metal micro-pore array filter membrane according to the present invention.
FIG. 3 is a process flow diagram of a metal micro-pore array filter membrane and a method for manufacturing the same according to the present invention.
Fig. 4 is a schematic view of the metal foil structure in step S1.
Fig. 5 is a schematic view of the structure of the clean metal foil in step S2.
Fig. 6 is a schematic view of the metal foil structure on the surface of the hilly micro-nano structure in step S3.
Fig. 7 is a schematic diagram of the structure of the metal foil with micro-hole array presented in step S4.
FIG. 8 is a schematic diagram of the structure of the metal micro-pore array filter membrane presented in step S5.
The reference numbers in the figures illustrate:
1. the filter membrane comprises a metal foil, 2 clean metal foil, 3 hilly micro-nano structure surface metal foil, 30 parallel groove arrays, 300 grooves, 4 micropore array metal foil, 40 micropores, 5 metal micropore array filter membranes.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
As shown in fig. 1-2, the invention provides a metal micropore array filtering membrane, which comprises a filtering membrane body, wherein a parallel groove array 30 is arranged on the surface of the filtering membrane body, the parallel groove array 30 is two groups of parallel grooves which are perpendicular to each other, a micropore array composed of micropores 40 is arranged on the filtering membrane body, and the parallel groove array 30 and the micropore array jointly form a hilly micro-nano structure of the filtering membrane.
In one embodiment, the width of the trench 300 in the parallel trenches is 10 μm to 30 μm, and the depth of the trench 300 is 10 μm to 40 μm.
In one embodiment, the distance between two adjacent parallel trenches in the parallel trench array 30 is 50 μm to 200 μm.
In one embodiment, the diameter of the micro-holes 40 in the micro-hole array is 20 μm to 100 μm, and the distance between adjacent micro-holes 40 in the micro-hole array is 50 μm to 200 μm.
As shown in fig. 3, a manufacturing method of a metal micro-pore array filtering membrane, which comprises the above metal micro-pore array filtering membrane, comprises the following steps:
s1, as shown in fig. 4, a metal foil 1 is provided.
S2, soaking the metal foil 1 provided in the step S1 in absolute ethyl alcohol and deionized water, ultrasonically cleaning for 5 minutes, and placing in nitrogen flow for drying; the clean metal foil 2 shown in fig. 5 is formed.
S3, scanning the surface of the metal foil by using a laser beam to form a hill-shaped micro-nano structure on the surface of the metal foil; the hilly micro-nano structure surface metal foil 3 shown in fig. 6 is obtained.
S4, drilling holes in the scanned area by using the laser beam to obtain the micro-hole array, and forming the micro-hole array metal foil 4 as shown in fig. 7.
And S5, cleaning the metal film with the hilly micro-nano structure and the micro-pore array after the step S4, soaking the metal film in absolute ethyl alcohol and deionized water for ultrasonic cleaning for 5 minutes during cleaning, and placing the metal film in nitrogen flow for drying. A metal micro-pore array filtration membrane 5 as shown in fig. 8 is formed.
In one embodiment, the metal foil 1 is one of brass, red copper, aluminum and titanium.
In one embodiment, the thickness of the metal foil 1 is 40-80 μm.
The invention is implemented as follows:
first, step S1 is executed, as shown in fig. 1 and 4, a metal foil 1 is provided, the material is one of brass, copper, aluminum, and titanium, and the thickness of the metal foil 1 is 40 to 80 μm. In this embodiment, red copper is specifically selected as the material of the metal foil 1, and 50 μm is specifically selected as the thickness of the metal foil 1.
And then, step S2 is executed, the metal foil 1 is respectively soaked in absolute ethyl alcohol and deionized water, ultrasonic cleaning is carried out for 5 minutes, and the metal foil is placed in nitrogen flow for drying, so that the clean metal foil 2 is obtained.
Next, step S3 is executed, the clean metal foil 2 is placed in a laser processing device workbench, a laser beam of the laser is focused on the surface of the clean metal foil 2, and the laser beam is made to scan the surface of the clean metal foil 2 along two groups of mutually perpendicular linear scanning arrays, so as to obtain two groups of mutually perpendicular parallel groove arrays 30 formed by the grooves 300, and construct the hilly-shaped micro-nano structure surface metal foil 3 with the hilly-shaped micro-nano structure surface. The width of the metal foil 3 groove on the hilly micro-nano structure surface is 10-30 mu m, and the depth can be 10-40 mu m.
The distance between two adjacent parallel grooves in the parallel groove array 30 may be 50 μm to 200 μm. In this embodiment, the width of the parallel trench array 30 is 20 μm, and the depth is 20 μm. The pitch of two adjacent parallel trenches in the parallel trench array 30 is selected to be 100 μm.
And step S4 is executed, the hilly micro-nano structure surface metal foil 3 is placed in a laser processing device workbench, a laser beam of the laser is focused on the surface of the hilly micro-nano structure surface metal foil 3, and a laser beam is used for drilling holes to obtain the micropore array metal foil 4 with the rough micro-nano structure and the micropores 40. The diameter of the micro-hole 40 is 20 μm to 100 μm, and the distance between adjacent holes in the micro-hole array may be 50 μm to 200 μm. In this embodiment, the diameter of the micro-hole is 20 μm, and the distance between adjacent micro-holes in the micro-hole array is 100 μm.
And finally, step S5 is executed, the metal foil 4 with the micropore array is respectively soaked in absolute ethyl alcohol and deionized water for 5 minutes of ultrasonic cleaning, and the metal foil is placed in nitrogen flow for drying, so that the clean metal micropore array filtering membrane 5 is obtained.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (3)
1. A metal micropore array filter membrane is characterized in that:
the filter membrane comprises a filter membrane body, wherein a parallel groove array is arranged on the surface of the filter membrane body, the parallel groove array is two groups of parallel grooves which are perpendicular to each other, a micropore array consisting of micropores is arranged on the filter membrane body, and the parallel groove array and the micropore array jointly form a hill-shaped micro-nano structure of the filter membrane;
the manufacturing method of the metal micropore array filtering membrane comprises the following steps:
s1, providing a metal foil;
s2, soaking the metal foil provided in the step S1 in absolute ethyl alcohol and deionized water, ultrasonically cleaning for 5 minutes, and placing in nitrogen flow for drying;
s3, scanning the surface of the metal foil by using a laser beam to form a hill-shaped micro-nano structure on the surface of the metal foil;
s4, drilling holes in the scanning area by using laser beams to obtain a micropore array;
s5, cleaning the metal film with the hillock-shaped micro-nano structure and the micro-pore array after the step S4, soaking the metal film in absolute ethyl alcohol and deionized water for ultrasonic cleaning for 5 minutes during cleaning, and placing the metal film in nitrogen flow for drying;
the width of the grooves in the parallel grooves is 10-30 mu m, and the depth of the grooves is 10-40 mu m;
the distance between two adjacent parallel grooves in the parallel groove array is 50-200 mu m;
the diameter of each micropore in the micropore array is 20-100 mu m, and the distance between every two adjacent micropores in the micropore array is 50-200 mu m.
2. A metal micro-pore array filtration membrane according to claim 1, wherein: the metal foil is one of brass, red copper, aluminum and titanium.
3. A metal micro-pore array filtration membrane according to claim 1 or 2, wherein: the thickness of the metal foil is 40-80 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810034525.5A CN110038449B (en) | 2018-01-15 | 2018-01-15 | Metal micropore array filter membrane and manufacturing method thereof |
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| CN201810034525.5A CN110038449B (en) | 2018-01-15 | 2018-01-15 | Metal micropore array filter membrane and manufacturing method thereof |
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| CN110038449A CN110038449A (en) | 2019-07-23 |
| CN110038449B true CN110038449B (en) | 2021-07-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3742770A1 (en) * | 1987-12-17 | 1989-06-29 | Akzo Gmbh | MICRO / ULTRAFILTRATION MEMBRANES WITH DEFINED PORO SIZE BY IRRADIATION WITH PULSE LASERS AND METHOD FOR THE PRODUCTION THEREOF |
| CN101712102A (en) * | 2009-09-15 | 2010-05-26 | 江苏大学 | Bionic metal ultra-wetting trans-scale structure design method and preparation method |
| CN105688447A (en) * | 2016-01-21 | 2016-06-22 | 北京理工大学 | Filter screen capable of realizing efficient oil-water separation, and method for preparing filter screen by femtosecond laser |
| CN107158754A (en) * | 2017-07-21 | 2017-09-15 | 厦门大学 | A kind of preparation method of the copper mesh with oil-water separating function |
-
2018
- 2018-01-15 CN CN201810034525.5A patent/CN110038449B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3742770A1 (en) * | 1987-12-17 | 1989-06-29 | Akzo Gmbh | MICRO / ULTRAFILTRATION MEMBRANES WITH DEFINED PORO SIZE BY IRRADIATION WITH PULSE LASERS AND METHOD FOR THE PRODUCTION THEREOF |
| CN101712102A (en) * | 2009-09-15 | 2010-05-26 | 江苏大学 | Bionic metal ultra-wetting trans-scale structure design method and preparation method |
| CN105688447A (en) * | 2016-01-21 | 2016-06-22 | 北京理工大学 | Filter screen capable of realizing efficient oil-water separation, and method for preparing filter screen by femtosecond laser |
| CN107158754A (en) * | 2017-07-21 | 2017-09-15 | 厦门大学 | A kind of preparation method of the copper mesh with oil-water separating function |
Non-Patent Citations (1)
| Title |
|---|
| Femtosecond laser ablated durable superhydrophobic PTFE films withmicro-through-holes for oil/water separation: Separating oil fromwater and corrosive solutions;J. Yong等;《Applied Surface Science》;20160715;第1148–1155页 * |
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