CN113842675B - Underwater super oleophobic stainless steel oil-water separation net and preparation method and application thereof - Google Patents
Underwater super oleophobic stainless steel oil-water separation net and preparation method and application thereof Download PDFInfo
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- CN113842675B CN113842675B CN202111125996.5A CN202111125996A CN113842675B CN 113842675 B CN113842675 B CN 113842675B CN 202111125996 A CN202111125996 A CN 202111125996A CN 113842675 B CN113842675 B CN 113842675B
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 8
- 229960000583 acetic acid Drugs 0.000 claims description 7
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- 238000001723 curing Methods 0.000 claims description 7
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- 239000013077 target material Substances 0.000 claims description 7
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 7
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003208 petroleum Substances 0.000 claims description 6
- 239000000178 monomer Substances 0.000 claims description 5
- 238000011282 treatment Methods 0.000 claims description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 4
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 claims description 4
- 239000003502 gasoline Substances 0.000 claims description 4
- 239000010705 motor oil Substances 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 4
- 239000008158 vegetable oil Substances 0.000 claims description 4
- 229940057995 liquid paraffin Drugs 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 235000019476 oil-water mixture Nutrition 0.000 claims description 3
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 239000012362 glacial acetic acid Substances 0.000 claims description 2
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 238000006555 catalytic reaction Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000013532 laser treatment Methods 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
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- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920002101 Chitin Polymers 0.000 description 1
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- 238000010521 absorption reaction Methods 0.000 description 1
- 125000000738 acetamido group Chemical group [H]C([H])([H])C(=O)N([H])[*] 0.000 description 1
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Classifications
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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
- B01D17/08—Thickening liquid suspensions by filtration
- B01D17/085—Thickening liquid suspensions by filtration with membranes
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention belongs to the technical field of functional materials, and particularly relates to an underwater super-oleophobic stainless steel oil-water separation net and a preparation method and application thereof. The underwater super oleophobic stainless steel oil-water separation net film comprises a stainless steel screen and a hydrophilic high polymer film, wherein the surface of the stainless steel screen is processed by a nanosecond fiber laser and is provided with a micro-nano mastoid structure and a nano villus structure, and the hydrophilic high polymer film is coated on the surface of the stainless steel screen through photo-curing. After the surface of the screen is pretreated by a nanosecond fiber laser, the surface roughness is increased, the hydrophilicity of the material is enhanced, the photocuring-coated hydrophilic high polymer film also has a micro-nano mastoid structure and a nano villus structure, and the super oleophobic characteristic of the screen is determined by the chemical composition of hydrophilicity and the surface roughness structure.
Description
Technical Field
The invention belongs to the technical field of functional materials, and particularly relates to an underwater super-oleophobic stainless steel oil-water separation net and a preparation method and application thereof.
Background
Petroleum is an important energy source, which makes a great contribution to the development of human society, however, as the development of society demands for petroleum and exploration techniques progress, offshore energy exploration is being carried out worldwide. However, the problem of man-made or trouble-free accidents during exploitation, storage and transportation causes tens of thousands of tons of oil per year to flow into the sea and river in various forms, causing damage. Once the spilled oil flows into the ocean, the spilled oil can spread along with the sea waves on the sea surface and cover the surface of a large area of sea area, so that the existence of marine organisms is threatened, and the water quality of the area is deteriorated. The traditional oil-water separation method such as gravity separation method, centrifugal separation method, vacuum dewatering method, absorption and adsorption method, membrane separation method, ultrasonic separation method, coalescence separation method and the like have the defects of low efficiency or secondary pollution to the environment, and the super oleophobic and super hydrophilic properties of the material are utilized to prepare a novel material for realizing oil-water separation, so that the novel material becomes one of research hot spots in the field.
Chinese patent publication No. CN102698471B, CN106745507a discloses a method for producing an oil-water separation net film. Although the oil-water separation effect is achieved, the method has the advantages of complex process, high cost and high energy consumption, and the use of harmful solvents causes secondary pollution to the environment.
Disclosure of Invention
The invention aims to solve the technical defects of the problems, and provides an underwater super-oleophobic stainless steel oil-water separation net, and a manufacturing method and application thereof. The oil-water separation net has the advantages of biological affinity, high separation efficiency, high separation speed, repeated recycling and easy cleaning, and has better separation effect on paraffin oil, n-hexane, petroleum ether, vegetable oil, engine oil, gasoline and diesel oil.
In order to achieve the purpose of the invention, the technical scheme adopted is as follows:
an underwater super oleophobic stainless steel oil-water separation net film comprises a stainless steel screen and a hydrophilic high polymer film, wherein the surface of the stainless steel screen is processed by a nanosecond fiber laser and is provided with a micro-nano mastoid structure and a nano villus structure, and the hydrophilic high polymer film is coated on the surface of the stainless steel screen through photocuring; the mesh number of the stainless steel screen is 100-800 meshes; after the surface of the screen is pretreated by a nanosecond fiber laser, the surface roughness is increased, the hydrophilicity of the material is enhanced, the photocuring-coated hydrophilic high polymer film also has a micro-nano mastoid structure and a nano villus structure, and the super oleophobic characteristic of the screen is determined by the chemical composition of hydrophilicity and the surface roughness structure.
Further, the hydrophilic high molecular polymer is a copolymer of natural polysaccharide and any one or more of hydrophilic acrylamide monomers, vinyl alcohol and acrylic acid, and the using amount of the natural polysaccharide in the copolymer is 2.29-8.58% (weight). Further, the hydrophilic acrylamide monomer is acrylamide and/or N, N-methylene bisacrylamide; and/or the natural polysaccharide is any one or more of sodium alginate, cellulose, starch, chitin and chitosan.
Further, the contact angle of the oil-water separation net film in air to water is 0 degree; the contact angle of the oil-water separation net film to oil drops in water is larger than 150 degrees. Further, the thickness of the hydrophilic high molecular polymer film is 1-5 micrometers.
The invention also provides a preparation method of the underwater super-oleophobic stainless steel oil-water separation net film, which comprises the following steps:
(1) Cleaning oil stains on the surface of the stainless steel screen with a detergent, sequentially ultrasonically cleaning the stainless steel screen in absolute ethyl alcohol, acetone and deionized water, and naturally airing the stainless steel screen at normal temperature;
(2) Placing the dried stainless steel screen on a workbench of a nanosecond laser engraving machine by taking copper foil as a target material, and performing laser scanning treatment to form a micro-nano mastoid structure and a nano-scale villus structure on the stainless steel screen; further, the laser frequency is controlled to be 20W, the laser wavelength is 1046nm, the laser type is pulse, and the marking depth and the marking line speed can be adjusted;
(3) Ultrasonically cleaning the stainless steel screen after the laser scanning treatment in the step (2) by using absolute ethyl alcohol and deionized water in sequence, and naturally airing;
(4) Dissolving natural polysaccharide in an organic solvent to obtain a stock solution; then adding any one or more of hydrophilic monomers such as acrylamide monomers, vinyl alcohol and acrylic acid and a photoinitiator (such as 2960 photoinitiator), and uniformly dispersing by ultrasonic; and finally immersing the stainless steel screen cloth in the step (3) after airing, and curing by ultraviolet irradiation to obtain the underwater super oleophobic stainless steel oil-water separation net film.
Further, the organic solvent in the step (4) is a ternary mixed solution of glacial acetic acid, tetrahydrofuran and deionized water;
further, the ultrasonic cleaning frequency in the step (3) and/or the step (4) is 20-40 kHz, and the power is 100-150W.
The underwater super oleophobic stainless steel oil-water separation net film is used for separating an oil phase and a water phase in an oil-water mixture or an oil-water mixed emulsion.
Specifically, the oil phase comprises any one or a mixture of more than one of liquid paraffin, normal hexane, petroleum ether, vegetable oil, engine oil, gasoline and diesel oil.
Compared with the prior art, the invention has the following beneficial effects:
(1) The hydrophilic high polymer film of the oil-water separation net film is formed on a stainless steel screen with a micro-nano mastoid structure and a nano fluff structure on the surface, and further the hydrophilic high polymer film also has the micro-nano mastoid structure and the nano fluff structure, so that the contact angle of the oil-water separation net film to water can reach 0 degree in air, and the contact angle of the oil-water separation net film to oil is larger than 150 degrees under water;
(2) The oil-water separation net film can be used for separating an oil phase and a water phase in an oil-water mixture or an oil-water mixed emulsion, wherein the oil phase can be liquid paraffin, n-hexane, petroleum ether, vegetable oil, engine oil, gasoline, diesel oil and the like;
(3) The amino group in the chitosan molecular structure has stronger reactivity than the acetamido group in the chitosan molecule, so that the polysaccharide has excellent biological function and can carry out chemical modification reaction, therefore, the oil-water separation net prepared by the invention has the advantages of bioaffinity, high separation efficiency, high separation speed, multiple times of recycling and easy cleaning, and has better oil-water separation effect.
Drawings
FIG. 1 shows the contact angle of underwater oil drops of an oil-water separation net film prepared in example 1 of the present invention;
FIG. 2 is an electron microscope scan at 1000 Xmagnification of the pretreated screen obtained in step four of example 1 of the present invention;
FIG. 3 is an electron microscope scan at 1500 Xmagnification of the pretreated screen obtained in step 4 of example 1 of the present invention;
fig. 4 shows the contact angle of oil droplets under water of the oil-water separation net prepared in example 4 of the present invention.
FIG. 5 the contact angle of oil droplets under water of the oil-water separation net prepared in comparative example 2 of the present invention.
FIG. 6 shows the oil-water separation performance of the oil-water separation net film prepared in example 1 of the present invention after multiple cycles.
Fig. 7 shows the contact angle of oil droplets under water of the oil-water separation net film prepared in example 2 of the present invention.
Detailed Description
The present invention is not limited to the following embodiments, and those skilled in the art can implement the present invention in various other embodiments according to the present invention, or simply change or modify the design structure and thought of the present invention, which fall within the protection scope of the present invention. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The experimental methods used in the following examples are conventional methods without specific description;
reagents, drugs, etc. used in the examples described below, were obtained commercially, where 2960 photoinitiator was purchased from Shanghai Ganchang New Material Co., ltd, unless otherwise specified.
Example 1.
The embodiment discloses a method for preparing an oil-water separation net film, which comprises the following steps:
step 1, dissolving 2g of Chitosan (CS) in 4% (v/v) acetic acid solution, stirring for 6 hours at 20 ℃, then adding tetrahydrofuran into the CS mixed solution to make the mass fraction of the CS mixed solution be 5wt%, and continuously stirring for 2 hours; dissolving 2.132g AM,0.5mg MBA,0.021g 2960 photoinitiator in 0.15g CS mixed solution, and performing ultrasonic dispersion for 20min;
step 2, cleaning oil stains on the surface of a 200-mesh stainless steel screen (with the aperture of 70 mu m and the wire diameter of 50 mu m) by using a detergent, sequentially ultrasonically cleaning the surface of the stainless steel screen in absolute ethyl alcohol, acetone and deionized water for 15min, and naturally airing the surface of the stainless steel screen at normal temperature;
step 3, taking copper foil as a target material, placing an air-dried stainless steel screen on a workbench of a nanosecond laser engraving machine, enabling a laser beam emitted by a laser source of the nanosecond laser engraving machine to pass through a focusing lens, then emitting the laser beam onto a base material through a vibrating mirror, and carrying out micro-texture construction on the surface of a workpiece by using the laser engraving machine; the laser frequency is 20W, the laser wavelength is 1046nm, the laser type is pulse, the mark line spacing is 0.01mm, and the mark line speed is 2000mm/s;
step 4, sequentially ultrasonically cleaning the mesh after laser treatment by using absolute ethyl alcohol and deionized water, and naturally airing;
step 5, immersing the treated stainless steel screen in the mixed solution prepared in the step 1, taking out after 5min, and putting the stainless steel screen into a 365nm low-pressure mercury lamp catalytic reaction device for curing to obtain an oil-water separation net film;
step 6, preparing a transparent plastic box with the size of 9cm multiplied by 9cm, and putting clean water into the box;
step 7, the contact angle of the underwater oil drop is measured by a contact angle instrument JC2000D1, a modified mesh is cut into a proper size, the proper size is fixed on a glass slide by double-sided adhesive tape, the oil drop is dropped at three positions of a sample by using a 5 mu L microsyringe, the static contact angle of the sample is measured by adopting an angle measuring method, and the result is shown in figure 1, and the contact angle of the underwater oil drop of the sample is 153 DEG in water;
and 8, scanning the pretreated screen obtained in the step four by using an electron microscope, and observing the surface morphology by multiplying 1000 times and 1500 times, wherein the result is shown in figures 2 and 3. The surface roughness and the hydrophilicity of the screen just after laser etching are increased, so that the hydrogel can firmly cover the surface of the screen.
Example 2.
The embodiment discloses a method for preparing an oil-water separation net film, which comprises the following steps:
step 1, 2g of CS is dissolved in 4% (v/v) acetic acid solution, stirred for 6 hours at 20 ℃, and then tetrahydrofuran is added into the CS mixed solution to make the mass fraction of the CS mixed solution be 5wt%, and the CS mixed solution is continuously stirred for 2 hours; dissolving 2.132g AM,0.5mg MBA,0.021g 2960 photoinitiator in 0.15g CS mixed solution, and performing ultrasonic dispersion for 20min;
step 2, cleaning oil stains on the surface of a 300-mesh copper net (with the aperture of 49 mu m and the wire diameter of 35 mu m) by using a detergent, sequentially ultrasonically cleaning the surface of the copper net in absolute ethyl alcohol, acetone and deionized water for 15min, and naturally airing the copper net at normal temperature;
step 3, taking copper foil as a target material, placing the dried copper net on a workbench of a nanosecond laser engraving machine, enabling a laser beam emitted by a laser source of the nanosecond laser engraving machine to pass through a focusing lens and then to be emitted onto a base material through a vibrating mirror, and carrying out micro-texture construction on the surface of a workpiece by using the laser engraving machine; the laser frequency is 30W, the laser wavelength is 1046nm, the laser type is pulse, the mark line spacing is 0.02mm, and the mark line speed is 1000mm/s;
step 4, sequentially ultrasonically cleaning the mesh after laser treatment by using absolute ethyl alcohol and deionized water, and naturally airing;
and 5, immersing the treated copper mesh in the mixed solution prepared in the step 1 for 15min, taking out, and putting the copper mesh into a 365nm low-pressure mercury lamp catalytic reaction device for curing to obtain an oil-water separation mesh film, wherein the result is shown in figure 7, and the underwater oil drop contact angle of a sample in water is 155 degrees. In addition, experiments show that the selection of stainless steel or copper wire materials and the selection of the screen pore diameter and the screen wire diameter in the embodiment 1 to the embodiment 2 have little influence on the hydrophilic and oleophobic performance of the oil-water separation screen film, the change of laser frequency can influence the mastoid structure, the laser frequency is increased, and the mastoid structure on the surface of the screen is increased; the spacing of the mark lines is reduced, and the mastoid structure on the surface of the screen is increased; the smaller the line speed of the mark, the better the structure of the mastoid on the surface of the screen.
Example 3.
The embodiment discloses a method for preparing an oil-water separation net film, which comprises the following steps:
step 1, 2g of CS is dissolved in 4% (v/v) acetic acid solution, stirred for 6 hours at 20 ℃, and then tetrahydrofuran is added into the CS mixed solution to make the mass fraction of the CS mixed solution be 5wt%, and the CS mixed solution is continuously stirred for 2 hours; dissolving 2.132g AM,0.5mg MBA,0.021g 2960 photoinitiator in 0.05g CS mixed solution, and performing ultrasonic dispersion for 20min;
step 2, cleaning greasy dirt on the surface of a 150-mesh titanium wire mesh (with the aperture of 100 mu m and the wire diameter of 60 mu m) by using a detergent, sequentially ultrasonically cleaning the surface of the 150-mesh titanium wire mesh in absolute ethyl alcohol, acetone and deionized water for 15min, and naturally airing the surface of the titanium wire mesh at normal temperature;
step 3, taking copper foil as a target material, placing the dried titanium wire mesh on a workbench of a nanosecond laser engraving machine, enabling a laser beam emitted by a laser source of the nanosecond laser engraving machine to pass through a focusing lens, then, emitting the laser beam onto a base material through a vibrating mirror, and carrying out micro-texture construction on the surface of a workpiece by using the laser engraving machine; the laser frequency is 10W, the laser wavelength is 1046nm, the laser type is pulse, the mark line spacing is 0.02mm, and the mark line speed is 1500mm/s;
step 4, sequentially ultrasonically cleaning the mesh after laser treatment by using absolute ethyl alcohol and deionized water, and naturally airing;
and 5, immersing the treated titanium wire mesh in the mixed solution prepared in the step 1, taking out after 10min, and putting the titanium wire mesh into a 365nm low-pressure mercury lamp catalytic reaction device for curing to obtain the oil-water separation mesh film, wherein the oil-water separation mesh film is arranged in water, and the underwater oil drop contact angle of a sample is 149 degrees. In the embodiment, the CS consumption is increased, the hydrophilic groups on the surface of the material are increased, and the underwater oleophobic performance is improved; stainless steel and titanium wire mesh have little influence; the mesh number has little influence; the laser parameters affect the same.
Example 4.
The embodiment discloses a method for preparing an oil-water separation net film, which comprises the following steps:
step 1, 2g of CS is dissolved in 4% (v/v) acetic acid solution, stirred for 6 hours at 20 ℃, and then tetrahydrofuran is added into the CS mixed solution to make the mass fraction of the CS mixed solution be 5wt%, and the CS mixed solution is continuously stirred for 2 hours; dissolving 2.132g AM,0.5mg MBA,0.021g 2960 photoinitiator in 0.1g CS mixed solution, and performing ultrasonic dispersion for 20min;
step 2, cleaning oil stains on the surface of a 300-mesh stainless steel screen (with the aperture of 49 mu m and the wire diameter of 35 mu m) by using a detergent, sequentially ultrasonically cleaning the surface of the stainless steel screen in absolute ethyl alcohol, acetone and deionized water for 15min, and naturally airing the surface of the stainless steel screen at normal temperature;
step 3, taking copper foil as a target material, placing the dried titanium wire mesh on a workbench of a nanosecond laser engraving machine, enabling a laser beam emitted by a laser source of the nanosecond laser engraving machine to pass through a focusing lens, then, emitting the laser beam onto a base material through a vibrating mirror, and carrying out micro-texture construction on the surface of a workpiece by using the laser engraving machine; the laser frequency is 30W, the laser wavelength is 1046nm, the laser type is pulse, the mark line spacing is 0.01mm, and the mark line speed is 1500mm/s;
step 4, sequentially ultrasonically cleaning the mesh after laser treatment by using absolute ethyl alcohol and deionized water, and naturally airing;
and 5, immersing the treated stainless steel screen in the mixed solution prepared in the step 1 for 10min, taking out, and putting into a 365nm low-pressure mercury lamp catalytic reaction device for curing to obtain the oil-water separation net film, wherein the oil-water separation net film is arranged in water, and the underwater oil drop contact angle of a sample is 151 degrees.
Example 5.
The embodiment discloses a method for preparing an oil-water separation net film, which comprises the following steps:
step 1, 2g of CS is dissolved in 4% (v/v) acetic acid solution, stirred for 6 hours at 20 ℃, and then tetrahydrofuran is added into the CS mixed solution to make the mass fraction of the CS mixed solution be 5wt%, and the CS mixed solution is continuously stirred for 2 hours; dissolving 2.132g AM,0.5mg MBA,0.021g 2960 photoinitiator in 0.1g CS mixed solution, and performing ultrasonic dispersion for 20min;
step 2, cleaning oil stains on the surface of a 300-mesh stainless steel screen (with the aperture of 49 mu m and the wire diameter of 35 mu m) by using a detergent, sequentially ultrasonically cleaning the surface of the stainless steel screen in absolute ethyl alcohol, acetone and deionized water for 15min, and naturally airing the surface of the stainless steel screen at normal temperature;
step 3, taking copper foil as a target material, placing the dried titanium wire mesh on a workbench of a nanosecond laser engraving machine, enabling a laser beam emitted by a laser source of the nanosecond laser engraving machine to pass through a focusing lens, then, emitting the laser beam onto a base material through a vibrating mirror, and carrying out micro-texture construction on the surface of a workpiece by using the laser engraving machine; the laser frequency is 30W, the laser wavelength is 1046nm, the laser type is pulse, the mark line spacing is 0.01mm, and the mark line speed is 2000mm/s;
step 4, sequentially ultrasonically cleaning the mesh after laser treatment by using absolute ethyl alcohol and deionized water, and naturally airing;
step 5, immersing the treated stainless steel screen in the mixed solution prepared in the step 1, taking out after 10min, and putting the stainless steel screen into a 365nm low-pressure mercury lamp catalytic reaction device for curing to obtain an oil-water separation net film; the oil-water separation net film of the embodiment is in water, and the underwater oil drop contact angle of the sample is 155 degrees.
Comparative example 1.
The comparative example discloses a method for preparing an oil-water separation net film, which comprises the following steps:
compared with example 1, the CS amount in step 1 of this example was 0.1g, and the other conditions were the same, as shown in fig. 4, the contact angle of the underwater oil drop in the oil-water separation net prepared in this comparative example was smaller than that in fig. 1, which indicates that the underwater oleophobic performance of the oil-water separation net film prepared in this example was not as good as that of example 1.
Comparative example 2.
The comparative example discloses a method for preparing an oil-water separation net film, which comprises the following steps:
compared with example 1, the amount of MBA used in step 1 of this example is 1mg, and the other conditions are the same, as shown in FIG. 5, the contact angle of the underwater oil drop of the oil-water separation net prepared in this example is smaller than that of FIG. 1, which indicates that the underwater oleophobic performance of the oil-water separation net film prepared in this example is not as good as that of example 1.
Comparative example 3
According to the invention, the laser is a nanosecond fiber laser, a micro-nano structure appears on a stainless steel screen after treatment, the stainless steel screen is naturally dried through ethanol ultrasonic treatment, the hydrophilic performance is reduced, a silver mirror reaction appears under water, then the silver mirror reaction disappears along with the wetting degree, meanwhile, a certain underwater oleophobic effect and anti-adhesion performance are shown on a modified screen, oil drops roll down from the screen to the bottom of a cup, and no oil stain is adhered on the surface after the screen is taken out from water. The long exposure time of the stainless steel screen with the micro-nano structure is hydrophobic because the temperature rise speed is slow when the sample is placed in an environment with increased temperature, and the wettability of the grid is changed from super-hydrophilicity to super-hydrophobicity after laser irradiation as non-polar carbon accumulates on the rough surface.
The above disclosed embodiments are complementary examples for clarity of illustration, and can provide corresponding guidance for subsequent use. Any modifications, equivalent substitutions and improvements in the various forms and modifications apparent to those skilled in the art based on the teachings described above are intended to be included within the scope of this invention.
Claims (4)
1. A preparation method of an underwater super oleophobic stainless steel oil-water separation net film is characterized by comprising the following steps: the underwater super oleophobic stainless steel oil-water separation net film comprises a stainless steel screen and a hydrophilic high polymer film, wherein the surface of the stainless steel screen is processed by a nanosecond laser engraving machine and is provided with a micro-nano mastoid structure and a nano villus structure, and the hydrophilic high polymer film is coated on the surface of the stainless steel screen through photocuring; the mesh number of the stainless steel screen is 100-800 meshes;
the hydrophilic high molecular polymer is a copolymer of one or more of hydrophilic acrylamide monomers, vinyl alcohol and acrylic acid and natural polysaccharide, and the using amount percentage of the natural polysaccharide in the copolymer is 2.29-8.58 percent (by weight);
the thickness of the hydrophilic high polymer film is 1-5 microns;
the hydrophilic high polymer membrane also has a micro-nano mastoid structure and a nano villus structure;
the hydrophilic acrylamide monomer is acrylamide and N, N-methylene bisacrylamide;
the natural polysaccharide is chitosan;
the contact angle of the oil-water separation net film in air to water is 0 degree; the contact angle of the oil-water separation net film to oil drops in water is larger than 150 degrees;
the preparation method comprises the following steps:
(1) Cleaning oil stains on the surface of the stainless steel screen with a detergent, sequentially ultrasonically cleaning the stainless steel screen in absolute ethyl alcohol, acetone and deionized water, and naturally airing the stainless steel screen at normal temperature;
(2) Placing an air-dried stainless steel screen on a workbench of a nanosecond laser engraving machine by taking copper foil as a target material, performing laser scanning treatment, controlling the laser power to be 20W, controlling the laser wavelength to be 1046nm, and enabling the marking depth and marking line speed to be adjustable so as to enable a micro-nano mastoid structure and a nano villus structure to be formed on the stainless steel screen;
(3) Ultrasonically cleaning the stainless steel screen after the laser scanning treatment in the step (2) by using absolute ethyl alcohol and deionized water in sequence, and naturally airing;
(4) Dissolving natural polysaccharide in an organic solvent to obtain a stock solution; then adding any one or more of hydrophilic acrylamide monomers, vinyl alcohol and acrylic acid and a photoinitiator, and uniformly dispersing by ultrasonic waves; and finally immersing the stainless steel screen cloth in the step (3) after airing, and curing by ultraviolet irradiation to obtain the underwater super oleophobic stainless steel oil-water separation net film.
2. The method for preparing the underwater super-oleophobic stainless steel oil-water separation net film according to claim 1, which is characterized in that: the organic solvent in the step (4) is ternary mixed solution of glacial acetic acid, tetrahydrofuran and deionized water;
and/or, the ultrasonic cleaning frequency in the step (3) is 20-40 kHz, and the power is 100-150W.
3. The use of the underwater super oleophobic stainless steel oil-water separation net membrane prepared by the method according to any one of claims 1 or 2, which is characterized in that: for the separation of an oil phase and a water phase in an oil-water mixture.
4. The use of the underwater super oleophobic stainless steel oil-water separation net membrane according to claim 3, wherein: the oil phase comprises any one or a mixture of more than one of liquid paraffin, normal hexane, petroleum ether, vegetable oil, engine oil, gasoline and diesel oil.
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