CN114874592B - Flexible porous super-hydrophobic film and preparation method thereof - Google Patents
Flexible porous super-hydrophobic film and preparation method thereof Download PDFInfo
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- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 93
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000010008 shearing Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000000967 suction filtration Methods 0.000 claims abstract description 18
- 239000000725 suspension Substances 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 14
- 230000001804 emulsifying effect Effects 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 229920000728 polyester Polymers 0.000 claims abstract description 9
- 239000002798 polar solvent Substances 0.000 claims abstract description 5
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical group C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 14
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 4
- 238000004945 emulsification Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims 3
- 238000000576 coating method Methods 0.000 abstract description 26
- 239000011248 coating agent Substances 0.000 abstract description 23
- 239000000463 material Substances 0.000 abstract description 18
- 239000002253 acid Substances 0.000 abstract description 5
- 239000003513 alkali Substances 0.000 abstract description 5
- 230000006750 UV protection Effects 0.000 abstract description 2
- 229920002725 thermoplastic elastomer Polymers 0.000 description 21
- 239000002904 solvent Substances 0.000 description 11
- 239000000243 solution Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 239000012266 salt solution Substances 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003760 magnetic stirring Methods 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 229920005570 flexible polymer Polymers 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention provides a flexible porous super-hydrophobic film and a preparation method thereof, which are used for solving the technical problem that the existing flexible super-hydrophobic surface is easy to peel, and comprise the following steps: adding high molecular polyester into a polar solvent, stirring and dissolving to prepare a suspension; emulsifying and shearing the suspension to obtain gel solution; and (3) carrying out suction filtration on the gel solution by using filter paper, forming a uniform gel layer on the filter paper, and drying the gel layer to form the flexible super-hydrophobic film. The flexible super-hydrophobic film material prepared by the invention realizes the coexistence of a surface microporous structure and low surface energy, and the integrated structure more effectively avoids the peeling or falling of the super-hydrophobic coating in the strain process. The method has simple preparation process and strong applicability, and the flexible super-hydrophobic film material has the durability of acid and alkali resistance, ultraviolet resistance and mechanical resistance.
Description
Technical Field
The invention belongs to the technical field of super-hydrophobic materials, and particularly relates to a flexible porous super-hydrophobic film and a preparation method thereof.
Background
Superhydrophobic coatings are a phenomenon common in nature, such as rapid rolling of water droplets on the surfaces of plants such as lotus leaves, rice leaves, and the like. The super-hydrophobic phenomenon is a state that the static contact angle of water drops on the solid surface is larger than 150 degrees and the rolling angle is smaller than 10 degrees, and the super-hydrophobic material has the important characteristics of self cleaning, corrosion resistance, pollution and fog resistance, ice resistance, dust resistance and the like, has practical application value in the pollution and corrosion resistance of industries such as building, automobiles, pipeline transportation, metals and the like, and has wide application prospects in various fields in production and life (CN 105440747A Chinese patent). Superhydrophobic coatings generally refer to microstructures having roughness and low surface energy, and typical coatings either have surface roughness or only low surface energy, in combination with subsequent processing, can achieve superhydrophobic surfaces (DOI: 10.1002/smll.201904248). Particularly for the flexible super-hydrophobic film material, under the action of stress, the interface joint of the coating of the micro-nano coarse structure and the substrate is easy to generate stress concentration to cause the peeling and the falling off of the surface micro-coarse structure (DOI: 10.1039/C2TA01073A, 10.1021/acsami.7b08920). The requirement of constructing the super-hydrophobic coating can be met by combining the flexible material with low surface energy with the porous structure, and the super-hydrophobic coating and flexible substrate integrated structure can effectively avoid peeling of the super-hydrophobic coating caused by mismatching of rigidity between interfaces; in addition, the solvent/non-solvent phase separation method can be applied to various low-surface-energy flexible materials to construct pore structures, and is easy to operate. Therefore, a porous microstructure is constructed on the surface of the flexible film material by utilizing the method of combining the flexibility, film forming property and hydrophobicity of the material with the solvent/non-solvent, thereby laying the foundation of wide application of the flexible super-hydrophobic film material.
The super-hydrophobic coating in daily use loses super-hydrophobic performance due to damage under the test of external stress, ultraviolet rays, acid-base salt corrosion and other conditions, so that the stable and durable flexible super-hydrophobic surface becomes a difficult problem to be overcome in the industry and academia. The development of the durable flexible super-hydrophobic coating material for realizing the super-hydrophobic long-term stability is an effective method, the integrated flexible super-hydrophobic film material can realize repeated bending, the stability of the super-hydrophobic surface after torsion, and the difficult problem of unstable adhesion of the super-hydrophobic surface in industrial application is solved.
Disclosure of Invention
Aiming at the technical problem that the existing flexible super-hydrophobic surface is easy to peel, the invention provides a flexible porous super-hydrophobic film and a preparation method thereof, and the prepared flexible porous film material has a surface microporous structure and low surface energy which coexist cooperatively, so that the construction of a flexible super-hydrophobic coating is realized, and the integrated structure is more effective in avoiding the peeling of the super-hydrophobic surface in the deformation process. The method has simple preparation process and strong applicability, and the flexible super-hydrophobic film material has the durability of acid and alkali resistance, ultraviolet resistance and mechanical resistance.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a preparation method of a flexible porous super-hydrophobic film comprises the following steps:
(1) Adding a high molecular polymer into a polar solvent, stirring and dissolving to prepare a suspension;
(2) Emulsifying and shearing the suspension prepared in the step (1) to obtain gel liquid;
(3) And (3) carrying out suction filtration on the gel liquid prepared in the step (2) by using filter paper, forming a uniform gel layer on the filter paper, and drying the gel layer to form the flexible super-hydrophobic film.
Preferably, the high molecular polymer in the step (1) is polyester, and the polyester is thermoplastic elastomer with different types.
Preferably, the polar solvent in the step (1) is tetrahydrofuran.
Preferably, in the step (1), the stirring temperature is 20-60 ℃ and the stirring time is 2-4 h.
Preferably, the rate of emulsification shearing in the step (2) is 500-8000 rpm, and the shearing time is 5-10 min.
Preferably, the concentration of the gel solution in the step (2) is 0.5-4 mg/mL, and the viscosity is 30000-50000 mpa.s.
Preferably, the suction filtration pressure in the step (3) is 0.02-0.1 MPa, and the suction filtration duration is 1-3 min.
Preferably, the thickness of the flexible super-hydrophobic film in the step (3) is 20-500 μm.
Preferably, the drying temperature in the step (3) is 20-100 ℃ and the relative humidity is 20-90%.
Preferably, the drying temperature in the step (3) is 20-50 ℃ and the relative humidity is 50-90%.
The flexible porous super-hydrophobic film is prepared by the method.
The invention has the beneficial effects that:
(1) The preparation method is simple and easy to operate; the existing coating technology with the micro-nano rough structure requires complicated preparation process, the microstructure regulation technology is harsh, and expensive materials and equipment are needed for reducing the surface energy of the material; compared with the method, the method for constructing the micro-rough structure on the low-surface-energy material by adopting the solvent/non-solvent phase separation method is simple and easy to obtain, low in price, low in environmental requirement, free of expensive equipment and capable of effectively saving cost.
(2) The integrated structure of the super-hydrophobic coating and the flexible substrate effectively avoids the peeling phenomenon of the super-hydrophobic coating between the super-hydrophobic coating and the flexible substrate under the action of stress caused by mismatching of rigidity, and provides a reliable method for preparing the flexible super-hydrophobic coating.
(3) The super-hydrophobic coating has the characteristics of improved durability, effective self-cleaning, bending resistance, pressure resistance, corrosion resistance and sun and rain resistance, and is suitable for outdoor environments. On the other hand, the flexibility of the film is enhanced by crosslinking the flexible polymer chain segments in the film, and the hole structure constructed by the surface elastomer can effectively realize the bouncing effect of large liquid drops on the surface of the film, so that the wider industrial application of the super-hydrophobic film material is laid.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of the rolling effect of water droplets on a flexible superhydrophobic film;
FIG. 2 is a scanning electron microscope image of the flexible superhydrophobic film prepared in example 1;
FIG. 3 is a partial enlarged view of a scanning electron microscope of the flexible superhydrophobic film prepared in example 1;
FIG. 4 is a cross-sectional electron microscopy image of a porous coating in the flexible superhydrophobic film prepared in example 1;
FIG. 5 shows the contact angle of the flexible superhydrophobic film prepared in example 2 after immersion in acid, alkali, and salt solutions for 72 h;
fig. 6 is a weather resistance test of the flexible superhydrophobic film prepared in example 3.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described represent only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
Example 1
A flexible porous super-hydrophobic film and a preparation method thereof comprise the following steps: 200mg of polyester (DuPont 5526) was added to 200mL of tetrahydrofuran, and magnetically stirred for 2 hours at 25℃to prepare a thermoplastic elastomer suspension; emulsifying and shearing the thermoplastic elastomer suspension, wherein the speed of an emulsifying and shearing machine is 5000rpm, and the shearing time is 8min, so that milky dispersion liquid is obtained, and magnetic stirring is continuously carried out, so that thermoplastic elastomer gel liquid in a stable adhesive state is formed; and (3) injecting 20mL of thermoplastic elastomer gel solution into a 60mL buchner funnel paved with qualitative filter paper, wherein the suction filtration pressure is 0.098Mpa, the suction filtration time is 1min, a uniform gel layer is formed, the gel layer is dried until the solvent is completely volatilized, the drying temperature is 25 ℃, RH is 50%, a flexible super-hydrophobic film is prepared, a porous super-hydrophobic coating structure (shown in figures 2 and 3) is formed on one surface of the flexible super-hydrophobic film facing air, the integrated structure of the super-hydrophobic surface and the flexible substrate is realized, the problem of peeling of the super-hydrophobic surface is avoided, and the thickness of the flexible super-hydrophobic film is 60 mu m (shown in figure 4).
And (3) measuring the superhydrophobic flexibility of the flexible superhydrophobic film:
the water contact angles before and after the film surface bending treatment were measured and recorded by a video optical contact angle measuring instrument (OCA 20). As shown in fig. 1, the initial film contact angle reaches 155.6 degrees, the rolling angle is smaller than 5 degrees, and the water drop can roll back and forth on the film surface; after bending, the contact angle of the water drop on the surface of the film is 154.8 degrees, the rolling angle is less than 5 degrees, and the film still shows good superhydrophobic performance. The test result shows that the film still shows good super-hydrophobic performance after being bent for many times and twisted.
Example 2
A flexible porous super-hydrophobic film and a preparation method thereof comprise the following steps: 300mg of polyester (DuPont 5526) was added to 200mL of tetrahydrofuran, and magnetically stirred at room temperature for 3 hours at 30℃to prepare a thermoplastic elastomer suspension; emulsifying and shearing the thermoplastic elastomer suspension, wherein the speed of an emulsifying and shearing machine is 8000rpm, and the shearing time is 5min, so that milky dispersion liquid is obtained, and magnetic stirring is continuously carried out for 4h, so that thermoplastic elastomer gel liquid in a stable adhesive state is formed; and (3) injecting 30mL of thermoplastic elastomer gel solution into a 60mL buchner funnel paved with qualitative filter paper, wherein the suction filtration pressure is 0.1Mpa, the suction filtration time is 2min, a uniform gel layer is formed, the gel layer is dried until the solvent is completely volatilized, the drying temperature is 30 ℃, RH is 70%, and a flexible super-hydrophobic film is prepared, wherein a porous super-hydrophobic coating structure is formed on one surface of the flexible super-hydrophobic film facing air, and the thickness of the flexible super-hydrophobic film is 70 mu m.
And (3) measuring corrosion resistance of the flexible super-hydrophobic film:
preparing 1mol/L acid, alkali and salt solution respectively by adopting HCl, naOH and NaCl, respectively soaking the flexible super-hydrophobic film in the solution, taking out after 72 hours, washing with water, completely drying, and measuring the water contact angle. Fig. 5 shows that after the film is immersed in the solution for 72 hours, the contact angle of the film surface is tested, and the contact angle is reduced, but the super-hydrophobic performance is still good. The contact angles of the coating after being immersed for 72 hours by acid, alkali and salt solutions are 151.5 degrees, 152.2 degrees and 150.6 degrees respectively, and the test results show that the coating has good corrosion resistance.
Example 3
A flexible porous super-hydrophobic film and a preparation method thereof comprise the following steps: 200mg of polyester (DuPont 5526) was added to 200mL of tetrahydrofuran, and magnetically stirred at room temperature for 2.5 hours at 25℃to prepare a thermoplastic elastomer suspension; emulsifying and shearing the thermoplastic elastomer suspension, wherein the speed of an emulsifying and shearing machine (ESR-500) is 3000rpm, and the shearing time is 10min, so that milky dispersion liquid is obtained, and stirring is continued for 3h, so that the thermoplastic elastomer gel liquid in a stable adhesive state is formed; and (3) injecting 20mL of thermoplastic elastomer gel solution into a 60mL buchner funnel paved with qualitative filter paper for suction filtration, wherein the suction filtration pressure is 0.02Mpa, the suction filtration time is 2min, a uniform gel layer is formed, the gel layer is dried until the solvent is completely volatilized, the drying temperature is 25 ℃, RH is 50%, a flexible super-hydrophobic film is prepared, a porous super-hydrophobic coating structure is formed on one surface of the flexible super-hydrophobic film facing air, and the thickness of the flexible super-hydrophobic film is 80 mu m.
And (3) testing the weather resistance of the flexible super-hydrophobic film:
the flexible film is irradiated by light for 5min by a heat-resistant sun-drying climate tester (YG 611L), the water contact angle of the flexible super-hydrophobic film is tested after the flexible film is subjected to the circulation of rain for 1min, as shown in fig. 6, the test result shows that the contact angle of the surface of the film can still be kept above 150 ℃ after the flexible film is irradiated by sunlight, and the coating has good weather resistance.
Example 4
A flexible porous super-hydrophobic film and a preparation method thereof comprise the following steps: 100mg of polyester (DuPont 5526) was added to 200mL of tetrahydrofuran, and magnetically stirred at room temperature for 2 hours at 20℃to prepare a thermoplastic elastomer suspension; emulsifying and shearing the thermoplastic elastomer suspension, wherein the shearing time of an emulsifying and shearing machine (ESR-500) is 500rpm for 10min to obtain milky dispersion, and continuously stirring for 3h to form thermoplastic elastomer gel liquid in a stable adhesive state; and (3) injecting 20mL of thermoplastic elastomer gel solution into a 60mL buchner funnel paved with qualitative filter paper for suction filtration, wherein the suction filtration pressure is 0.1Mpa, the suction filtration time is 1min, a uniform gel layer is formed, the gel layer is dried until the solvent is completely volatilized, the drying temperature is 20 ℃, RH is 90%, a flexible super-hydrophobic film is prepared, a porous super-hydrophobic coating structure is formed on one surface of the flexible super-hydrophobic film facing air, and the thickness of the flexible super-hydrophobic film is 20 mu m.
Example 5
A flexible porous super-hydrophobic film and a preparation method thereof comprise the following steps: 400mg of polyester (DuPont 5526) was added to 100mL of tetrahydrofuran, and magnetically stirred at room temperature for 4 hours at 60℃to prepare a thermoplastic elastomer suspension; emulsifying and shearing the thermoplastic elastomer suspension, wherein the speed of an emulsifying and shearing machine (ESR-500) is 8000rpm, and the shearing time is 10min, so that milky dispersion liquid is obtained, and stirring is continued for 3h, so that the thermoplastic elastomer gel liquid in a stable adhesive state is formed; and (3) injecting 40mL of thermoplastic elastomer gel solution into a 60mL buchner funnel paved with qualitative filter paper for suction filtration, wherein the suction filtration pressure is 0.02Mpa, the suction filtration time is 3min, a uniform gel layer is formed, the gel layer is dried until the solvent is completely volatilized, the drying temperature is 100 ℃, RH is 20%, a flexible super-hydrophobic film is prepared, a porous super-hydrophobic coating structure is formed on one surface of the flexible super-hydrophobic film facing air, and the thickness of the flexible super-hydrophobic film is 500 mu m.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (6)
1. The preparation method of the flexible porous super-hydrophobic film is characterized by comprising the following steps of:
(1) Adding a high molecular polymer into a polar solvent, stirring and dissolving to prepare a suspension;
(2) Emulsifying and shearing the suspension prepared in the step (1) to obtain gel liquid;
(3) Carrying out suction filtration on the gel liquid prepared in the step (2) by using filter paper, forming a uniform gel layer on the filter paper, and drying the gel layer to form a flexible porous super-hydrophobic film;
the high molecular polymer in the step (1) is polyester; the polar solvent is tetrahydrofuran;
the concentration of the gel solution in the step (2) is 0.5-4 mg/mL, and the viscosity is 30000-50000 mpa.s;
the drying temperature in the step (3) is 20-100 ℃ and the relative humidity is 20-90%;
the rate of emulsification shearing in the step (2) is 500-8000 rpm, and the shearing time is 5-10 min.
2. The method for preparing the flexible porous super-hydrophobic film according to claim 1, wherein the method comprises the following steps: in the step (1), the stirring temperature is 20-60 ℃ and the stirring time is 2-4 h.
3. The method for preparing the flexible porous super-hydrophobic film according to claim 1, wherein the method comprises the following steps: and (3) filtering under the condition that the filtering pressure is 0.02-0.1 MPa and the filtering time is 1-3 min.
4. The method for preparing the flexible porous super-hydrophobic film according to claim 1, wherein the method comprises the following steps: and (3) the thickness of the flexible super-hydrophobic film in the step (3) is 20-500 mu m.
5. The method for preparing the flexible porous super-hydrophobic film according to claim 1, wherein the method comprises the following steps: and (3) drying at 20-50 ℃ and with relative humidity of 50-90%.
6. The flexible porous superhydrophobic film prepared by the method of claim 5.
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