Preparation method of super-hydrophobic super-oleophylic electrostatic spinning nanofiber membrane

Abstract

The invention relates to the technical field of air filtering membranes, and discloses a preparation method of a super-hydrophobic super-oleophylic electrostatic spinning nanofiber membrane, which comprises the following steps: dissolving polyvinylidene fluoride and fluorine-containing polyurethane in a N, N-dimethylformamide solvent according to a certain proportion; heating and stirring under a controlled water bath condition by using a magnetic stirrer until the solution is uniform and faint yellow; standing the obtained spinning solution for 12 hours until no bubble exists in the spinning solution; the polyvinylidene fluoride-fluorine-containing polyurethane composite nanofiber membrane is prepared by adopting an electrostatic spinning process, and the proportion of the polyvinylidene fluoride and the fluorine-containing polyurethane is as follows: the mass concentration of the polyvinylidene fluoride in a spinning solution is 10%-18%. The super-hydrophobic and super-oleophylic nanofiber membrane shows excellent stability in a high-humidity and oily environment, the industrial filtering efficiency is remarkably improved, the service life of the super-hydrophobic and super-oleophylic nanofiber membrane is remarkably prolonged, moisture absorption caking and thermal damage are effectively reduced, and the maintenance cost and the environmental influence are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of air filtration membranes, and in particular to a method for preparing a super-hydrophobic and super-oleophilic electrostatic spinning nanofiber membrane. Background Art

[0002] Industrial production environments produce a large number of oily particles with tiny diameters, which not only pollute the environment but also pose a threat to human health. Filtration technology is one of the important means to remove these fine particles.

[0003] Existing filtration technologies include nanofiber filtration technology and electrostatic filtration technology, which not only provides higher particle interception efficiency than traditional mechanical filtration due to its fine fiber structure, but also achieves lower filtration resistance and energy consumption due to the high porosity between fibers. Compared with electrostatic filtration technology, nanofiber materials have stronger chemical and physical stability and are less sensitive to humidity and temperature changes, thereby extending their service life and reducing maintenance costs.

[0004] Although the existing nanofiber filtration technology has strong chemical and physical stability, it still has some shortcomings. In the industrial production process, water mist is often used for cooling, which causes the oily particles to contain water vapor. In this humid environment, traditional nanofiber membranes are prone to moisture absorption and agglomeration, affecting their filtration efficiency and service life. At the same time, the lubricating oil used in industrial workshops makes the particles have a high oil content, and the room temperature in industrial workshops often exceeds 30°C during the transition season. These factors cause traditional nanofiber membranes to face problems of reduced performance and structural damage in practical applications. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a method for preparing a super-hydrophobic and super-oleophilic electrospun nanofiber membrane. The super-hydrophobic and super-oleophilic electrospun nanofiber membrane of the present invention significantly improves the filtration efficiency and service life in industrial applications through its unique chemical and physical properties. The fiber membrane exhibits excellent stability in high humidity and oily environments, effectively prevents moisture absorption, agglomeration and thermal damage, reduces maintenance costs, and reduces environmental impact.

[0006] To achieve the above objectives, the present invention is implemented by the following technical scheme: A method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane comprises the following steps:

[0007] Dissolving polyvinylidene fluoride and fluorine-containing polyurethane in a certain proportion in N,N-dimethylformamide solvent;

[0008] Use a magnetic stirrer to heat and stir in a controlled water bath until the solution is homogeneous and pale yellow;

[0009] The obtained spinning solution was allowed to stand for 12 hours until there were no bubbles in the spinning solution;

[0010] The polyvinylidene fluoride-fluorinated polyurethane composite nanofiber membrane was prepared by electrospinning technology.

[0011] Preferably, the ratio of the polyvinylidene fluoride to the fluorine-containing polyurethane comprises:

[0012] The mass concentration of polyvinylidene fluoride in the spinning solution is 10% to 18%;

[0013] The mass concentration of fluorinated polyurethane is 0.3% to 3%.

[0014] Preferably, the water bath heating process comprises:

[0015] Carry out at a temperature range of 65°C to 75°C;

[0016] The duration is 8 to 12 hours.

[0017] Preferably, the electrospinning conditions include:

[0018] Set the spinning voltage to 15kV~18kV;

[0019] The spinning distance is fixed at 15cm to 17cm;

[0020] The flow rate of the liquid provided is 0.8 ml / h to 1.2 ml / h.

[0021] Preferably, the electrospinning process comprises:

[0022] A roller receiving device is used to collect the nanofiber membrane at a fixed rotation speed;

[0023] The speed of the receiving roller is 550rpm~650rpm;

[0024] The translation speed is 950mm / min~1050mm / min.

[0025] Preferably, the electrospinning process further comprises:

[0026] The temperature of the spinning solution is maintained at 19°C to 23°C;

[0027] The humidity is controlled at 15% to 25% to ensure environmental stability during the spinning process.

[0028] Preferably, the water contact angle of the obtained super-hydrophobic and super-oleophilic electrospun nanofiber membrane is 140° to 155°, and the oil contact angle is 0° to 5°.

[0029] Preferably, a stabilizer and a pH regulator are added in the step of preparing the spinning solution to adjust the viscosity and stability of the spinning solution and promote the uniform formation of nanofibers.

[0030] Preferably, the method for preparing the nanofiber membrane further comprises a post-treatment step, namely, heat-treating the prepared nanofiber membrane to maintain its dimensional stability.

[0031] Preferably, the post-processing step comprises:

[0032] The temperature range of heat treatment is 100℃~150℃;

[0033] The duration is 2 to 4 hours.

[0034] The present invention provides a method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane. It has the following beneficial effects:

[0035] 1. The super-hydrophobic and super-oleophilic electrospun nanofiber membrane of the present invention exhibits remarkable chemical and physical stability, and can maintain efficient filtration performance even in industrial environments with high humidity and high oil content. Its structure is not easy to agglomerate due to moisture absorption, which effectively prolongs the service life of the filter material and reduces the replacement frequency and maintenance cost.

[0036] 2. The preparation method of the nanofiber membrane enables the material to have excellent thermal stability and be able to withstand temperature fluctuations in common industrial environments. Especially under high temperature conditions exceeding 30°C, the performance and structure of the fiber membrane remain stable, solving the problem of performance degradation of traditional nanofiber materials in practical applications.

[0037] 3. The nanofiber membrane of the present invention can more effectively separate oil-water mixtures due to its superoleophilic and superhydrophobic properties, reducing the environmental pollution of oily particles in industrial emissions. In addition, the improved fiber membrane design reduces energy consumption and filtration resistance, further reducing the environmental burden of the filtration process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a flow chart of the preparation process of the present invention;

[0039] Figure 2 This is a SEM image of the super-hydrophobic and super-oleophilic electrospun nanofiber membrane prepared in Example 1;

[0040] Figure 3 This is a SEM image of the super-hydrophobic and super-oleophilic electrospun nanofiber membrane prepared in Example 3;

[0041] Figure 4 This is a SEM image of the super-hydrophobic and super-oleophilic electrospun nanofiber membrane prepared in Example 5;

[0042] Figure 5This is a diameter distribution diagram of the super-hydrophobic and super-oleophilic electrospun nanofiber membrane prepared in Example 1;

[0043] Figure 6 This is a diameter distribution diagram of the super-hydrophobic and super-oleophilic electrospun nanofiber membrane prepared in Example 3;

[0044] Figure 7 This is a diameter distribution diagram of the super-hydrophobic and super-oleophilic electrospun nanofiber membrane prepared in Example 5;

[0045] Figure 8 This is a thermal stability diagram of the super-hydrophobic and super-oleophilic electrospun nanofiber membranes prepared in Examples 1-5. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Please see attached Figure 1 The present invention provides a method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane, comprising the following steps:

[0048] Dissolving polyvinylidene fluoride and fluorinated polyurethane in a certain proportion in N,N-dimethylformamide solvent, by adding polyvinylidene fluoride and fluorinated polyurethane, it is possible to provide the nanofiber membrane with higher chemical stability and excellent hydrophobic and oleophilic properties;

[0049] A magnetic stirrer is used to heat and stir under controlled water bath conditions until the solution is uniform and light yellow. The above steps ensure the uniformity of the spinning solution and provide an ideal solution state for the subsequent electrospinning process, thereby improving the quality and consistency of the final product.

[0050] The obtained spinning solution is allowed to stand for 12 hours until there are no bubbles in the spinning solution. The bubbles in the solution can be completely lifted and dissipated by standing, thereby avoiding the problem of fiber defects during the spinning process. The bubble-free solution helps to produce defect-free fibers and enhance the structural integrity and filtration efficiency after film formation.

[0051] The polyvinylidene fluoride-fluorinated polyurethane composite nanofiber membrane was produced by electrospinning. Electrospinning is a process of making fibers through a high-voltage electric field. The treated spinning solution is loaded into the syringe, and high voltage is used to form a tip discharge at the needle. The spinning solution is stretched into fine fibers under the action of the electric field force and collected on the receiving device on the opposite side. A nanofiber membrane with a highly ordered structure can be produced. This structure not only improves the filtration efficiency, but also reduces the resistance, so that the nanofiber membrane has better performance and longer service life in industrial applications.

[0052] In a preferred embodiment of the present invention, the ratio of polyvinylidene fluoride to fluorine-containing polyurethane comprises:

[0053] The mass concentration of polyvinylidene fluoride in the spinning solution is 10% to 18%. This concentration range can ensure the sufficient presence of PVDF, so that the final fiber membrane has good mechanical strength and chemical stability;

[0054] The mass concentration of fluorinated polyurethane is 0.3% to 3%, which provides elasticity and flexibility to the fiber and enhances the lipophilicity of the fiber membrane, enabling it to perform well in oil-water separation applications.

[0055] By adding polyvinylidene fluoride and fluorinated polyurethane, the membrane is ensured to have a high degree of superhydrophobicity and superoleophilicity.

[0056] In a preferred embodiment of the present invention, the water bath heating process comprises:

[0057] The temperature range is 65℃~75℃, which is based on the optimization of thermal stability and solubility of the two polymers. Too high a temperature will easily lead to polymer degradation or premature polymerization, while too low a temperature will easily lead to incomplete dissolution;

[0058] The duration is 8 to 12 hours, which is long enough to ensure that all solid components are fully dissolved in the solvent and the solution reaches the desired homogeneity.

[0059] The above steps not only ensure the chemical uniformity of the spinning solution, but also help improve the controllability of the fiber preparation process and the fiber quality. The uniform solution directly affects the physical structure and surface properties of the final fiber, thereby optimizing the superhydrophobic and superoleophilic properties of the fiber membrane.

[0060] In a preferred embodiment of the present invention, the electrospinning conditions include:

[0061] The spinning voltage was set to 15 kV to 18 kV. This voltage range ensured sufficient force to stretch the polymer solution to form long and thin fibers while avoiding unstable jetting or over-stretching caused by excessive voltage.

[0062] The spinning distance is fixed at 15 cm to 17 cm. This distance helps the fiber to fully solidify during flight, rather than solidifying before reaching the collector, which would affect the fiber arrangement and uniformity.

[0063] The flow rate of the liquid provided is 0.8ml / h to 1.2ml / h. Accurate flow rate control can ensure the uniformity of the spinning solution supply, thereby producing fibers with uniform diameters, while avoiding clogging of the spinning head or fiber breakage caused by too fast supply.

[0064] Electrospinning is a highly efficient nanofiber manufacturing technology that applies high voltage to spray fine fibers from polymer solution and collect them to form a fiber membrane. At the same time, the optimization of these parameters makes the final nanofiber membrane not only have excellent superhydrophobic and superoleophilic properties, but also have better structural integrity, enabling it to exhibit longer service life and higher filtration efficiency in harsh industrial environments.

[0065] In a preferred embodiment of the present invention, the electrospinning process comprises:

[0066] A roller receiving device is used to collect the nanofiber membrane at a fixed rotation speed, and the roller receiving device is used to collect the elongated nanofibers formed by stretching in a high voltage electric field;

[0067] The speed of the receiving drum is 550 rpm to 650 rpm. This speed range optimizes the speed and efficiency of fiber deposition, ensuring that the fibers can be wound quickly and evenly when they contact the drum surface, reducing the aggregation and entanglement between fibers.

[0068] The translation speed is 950mm / min~1050mm / min. This speed is matched with the drum rotation speed to adjust the arrangement of the fibers on the drum surface, making the fiber layers more uniform and effectively controlling the thickness and density of the fiber film.

[0069] In a preferred embodiment of the present invention, the electrospinning process further comprises:

[0070] The temperature of the spinning solution is maintained at 19°C to 23°C. This temperature range helps to maintain the viscosity and rheological properties of the polymer solution. At this temperature, the polymer chains can be smoothly stretched into fibers when subjected to high electric field forces, while preventing premature evaporation or condensation that would affect spinning.

[0071] The humidity is controlled at 15% to 25% to ensure the environmental stability of the spinning process. Within this humidity range, the effect of moisture in the air on the spinning process is minimized, avoiding fiber moisture absorption and agglomeration due to excessive humidity, or static interference or excessive solvent evaporation due to low humidity.

[0072] This environmental control strategy helps produce nanofiber membranes with consistency and predictability, improving the superhydrophobic and superoleophilic properties of the membranes, enabling them to exhibit better performance and longer service life in a variety of industrial filtration applications.

[0073] In a preferred embodiment of the present invention, the water contact angle of the obtained super-hydrophobic and super-oleophilic electrospun nanofiber membrane is 140°~155°. This high degree of hydrophobicity is usually achieved by increasing the microscopic and nanoscale roughness of the surface. The nanofiber structure itself provides sufficient surface roughness, which enhances the beading effect of water droplets on the surface. The oil contact angle is 0°~5°. Through this oil contact angle range, oil droplets can quickly expand when contacting the water surface, thereby improving the oil-water separation efficiency.

[0074] In a preferred embodiment of the present invention, a stabilizer and a pH regulator are added to the spinning solution preparation step to adjust the viscosity and stability of the spinning solution and promote the uniform formation of nanofibers. The introduction of the stabilizer is intended to reduce the precipitation and separation of the components in the spinning solution and maintain its uniformity. The addition of the pH regulator is used to control the pH of the spinning solution, which is crucial to maintaining the dissolved state and viscosity of the polymer. By adding stabilizers and pH regulators, the spinning solution preparation step greatly improves the controllability and repeatability of the spinning process. This not only ensures the uniform formation of the fibers, but also improves the quality and performance of the entire fiber membrane. The uniform and stable fiber structure helps to achieve more efficient filtration performance and better physical properties, allowing the fiber membrane to exhibit better stability and durability when dealing with complex industrial environments.

[0075] In a preferred embodiment of the present invention, the method for preparing the nanofiber membrane further includes a post-treatment step, that is, heat-treating the prepared nanofiber membrane to maintain its dimensional stability. The mechanism of heat treatment on the fiber membrane is based on the principles of polymer physics. During the heating process, the polymer chains can rearrange and relax internal stresses. This rearrangement is "locked" after cooling, so that the size and morphology of the entire fiber membrane are more stable. This process can also improve the bonding force between fibers and enhance the mechanical strength of the overall structure, thereby improving the dimensional stability of the nanofiber membrane.

[0076] In a preferred embodiment of the present invention, the post-processing step comprises:

[0077] The temperature range of the heat treatment is 100°C to 150°C, which is carefully selected to accommodate the thermal stability of polyvinylidene fluoride and fluorinated polyurethane, ensuring maximum crosslinking and relaxation of the polymer chains without causing thermal degradation of the polymers;

[0078] The duration is 2 to 4 hours, which allows the heat energy to evenly penetrate the entire fiber membrane, promoting a more thorough rearrangement and fixation of the polymer chains while ensuring that the stress inside the material is fully released.

[0079] The present invention is further described in detail below with reference to specific embodiments.

[0080] Embodiment 1:

[0081] 7g polyvinylidene fluoride and 0.25g fluorinated polyurethane were dissolved in 42.75ml N,N-dimethylformamide solvent, with a total mass of 50g. A magnetic stirrer was used to heat in a 70℃ water bath for 10h. After stirring evenly, a light yellow spinning solution was obtained. The obtained spinning solution was allowed to stand for 12h until there were no bubbles in the spinning solution and then poured into the syringe. The spinning conditions were as follows: spinning voltage was 16kV, receiving distance was 16cm, liquid feeding speed was 1ml / h, receiving roller speed was 600rpm, translation speed was 1000mm / min, temperature was 19℃~23℃, relative humidity was 15%~25%, and nanofibers were collected by roller receiving device to obtain polyvinylidene fluoride-fluorinated polyurethane composite nanofiber membrane.

[0082] Embodiment 2:

[0083] 7g of polyvinylidene fluoride and 0.5g of fluorinated polyurethane were dissolved in 42.5ml of N,N-dimethylformamide solvent, with a total mass of 50g. A magnetic stirrer was used to heat in a 70℃ water bath for 10h. After stirring evenly, a light yellow spinning solution was obtained. The obtained spinning solution was allowed to stand for 12h until there were no bubbles in the spinning solution and then poured into the syringe. The spinning conditions were as follows: spinning voltage was 16kV, receiving distance was 16cm, liquid feeding speed was 1ml / h, receiving roller speed was 600rpm, translation speed was 1000mm / min, temperature was 19℃~23℃, relative humidity was 15%~25%, and nanofibers were collected by roller receiving device to obtain polyvinylidene fluoride-fluorinated polyurethane composite nanofiber membrane.

[0084] Embodiment 3:

[0085] 7g polyvinylidene fluoride and 0.75g fluorinated polyurethane were dissolved in 42.25ml N,N-dimethylformamide solvent, with a total mass of 50g. A magnetic stirrer was used to heat in a 70℃ water bath for 10h. After stirring evenly, a light yellow spinning solution was obtained. The obtained spinning solution was allowed to stand for 12h until there were no bubbles in the spinning solution and then poured into the syringe. The spinning conditions were as follows: spinning voltage was 16kV, receiving distance was 16cm, liquid feeding speed was 1ml / h, receiving roller speed was 600rpm, translation speed was 1000mm / min, temperature was 19℃~23℃, relative humidity was 15%~25%, and nanofibers were collected by roller receiving device to obtain polyvinylidene fluoride-fluorinated polyurethane composite nanofiber membrane.

[0086] Embodiment 4:

[0087] 7g of polyvinylidene fluoride and 1g of fluorinated polyurethane were dissolved in 42ml of N,N-dimethylformamide solvent, with a total mass of 50g. A magnetic stirrer was used to heat in a water bath at 70℃ for 10h. After stirring evenly, a light yellow spinning solution was obtained. The obtained spinning solution was allowed to stand for 12h until there were no bubbles in the spinning solution and then poured into the syringe. The spinning conditions were as follows: spinning voltage was 16kV, receiving distance was 16cm, liquid feeding speed was 1ml / h, receiving roller speed was 600rpm, translation speed was 1000mm / min, temperature was 19℃~23℃, relative humidity was 15%~25%, and nanofibers were collected by roller receiving device to obtain polyvinylidene fluoride-fluorinated polyurethane composite nanofiber membrane.

[0088] Embodiment 5:

[0089] 7g polyvinylidene fluoride and 1.25g fluorinated polyurethane were dissolved in 41.75ml N,N-dimethylformamide solvent, with a total mass of 50g. A magnetic stirrer was used to heat in a 70℃ water bath for 10h. After stirring evenly, a light yellow spinning solution was obtained. The obtained spinning solution was allowed to stand for 12h until there were no bubbles in the spinning solution and then poured into the syringe. The spinning conditions were as follows: spinning voltage was 16kV, receiving distance was 16cm, liquid feeding speed was 1ml / h, receiving roller speed was 600rpm, translation speed was 1000mm / min, temperature was 19℃~23℃, relative humidity was 15%~25%, and nanofibers were collected by roller receiving device to obtain polyvinylidene fluoride-fluorinated polyurethane composite nanofiber membrane.

[0090] The super-hydrophobic and super-oleophilic electrospun nanofiber membranes prepared in Examples 1-5 were tested.

[0091] Testing tools:

[0092] The fiber diameter of nanofibers was tested by a German Zeiss scanning electron microscope;

[0093] The water contact angle and oil contact angle of the nanofiber membrane were measured using a German Kruess contact angle meter;

[0094] The filtration efficiency and pressure drop were tested by an air filtration performance test device under the following test conditions: wind speed of 0.54m / s and oily particles of 0.3-1.0μm.

[0095] The test results are shown in the following table

[0096]

[0097] From the above table, we can get:

[0098] The super-hydrophobic and super-oleophilic electrospun nanofiber membrane of the present invention has excellent super-hydrophobic and super-oleophilic properties, and its filtration efficiency for oily particles of 0.3-1.0 μm is 99.7% or above, and the pressure drop is only 153.6-154.3 Pa, showing the ability to efficiently capture fine particles, providing a new material choice for industrial oily particle filtration technology.

[0099] Examples 1-5 were treated in high temperature environments of 40°C, 70°C and 100°C for 1 h, and the morphological changes of the nanofiber membranes at different temperatures were observed. The test results are as follows: Figure 8 .from Figure 8 It can be seen that the size of the nanofiber membrane remains unchanged after heat treatment and has good thermal stability.

[0100] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane, characterized in that: The following steps are involved: Dissolving polyvinylidene fluoride and fluorine-containing polyurethane in a certain proportion in N,N-dimethylformamide solvent; Use a magnetic stirrer to heat and stir in a controlled water bath until the solution is homogeneous and pale yellow; The obtained spinning solution was allowed to stand for 12 hours until there were no bubbles in the spinning solution; The polyvinylidene fluoride-fluorinated polyurethane composite nanofiber membrane was prepared by electrospinning technology.

2. The method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane according to claim 1, characterized in that: The ratio of polyvinylidene fluoride and fluorine-containing polyurethane includes: The mass concentration of polyvinylidene fluoride in the spinning solution is 10% to 18%; The mass concentration of fluorinated polyurethane is 0.3% to 3%.

3. The method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane according to claim 1, characterized in that: The water bath heating process comprises: Carry out at a temperature range of 65°C to 75°C; The duration is 8 to 12 hours.

4. The method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane according to claim 1, characterized in that: The electrospinning conditions include: Set the spinning voltage to 15kV~18kV; The spinning distance is fixed at 15cm to 17cm; The flow rate of the liquid provided is 0.8 ml / h to 1.2 ml / h.

5. The method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane according to claim 1, characterized in that: The electrospinning process comprises: A roller receiving device is used to collect the nanofiber membrane at a fixed rotation speed; The speed of the receiving roller is 550rpm~650rpm; The translation speed is 950mm / min~1050mm / min.

6. The method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane according to claim 1, characterized in that: The electrospinning process further comprises: The temperature of the spinning solution is maintained at 19°C to 23°C; The humidity is controlled at 15% to 25% to ensure environmental stability during the spinning process.

7. The method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane according to claim 1, characterized in that: The water contact angle of the obtained super-hydrophobic and super-oleophilic electrospun nanofiber membrane is 140°-155°, and the oil contact angle is 0°-5°.

8. The method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane according to claim 1, characterized in that: In the preparation step of the spinning solution, a stabilizer and a pH regulator are added to adjust the viscosity and stability of the spinning solution and promote the uniform formation of nanofibers.

9. The method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane according to claim 1, characterized in that: The method for preparing the nanofiber membrane also includes a post-treatment step, that is, heat-treating the prepared nanofiber membrane to maintain its dimensional stability.

10. The method for preparing a super-hydrophobic and super-oleophilic electrospinning nanofiber membrane according to claim 9, characterized in that: The post-processing steps include: The temperature range of heat treatment is 100℃~150℃; The duration is 2 to 4 hours.

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