Preparation equipment and method of wave-absorbing anticorrosion film

Abstract

This invention discloses a device and method for preparing a microwave absorbing and anti-corrosion film, belonging to the field of thin film material preparation technology. This invention employs a composite of Fe3O4@PANI core-shell magnetic nano-absorbing microcapsules, a carbon nanotube network microwave absorber, and a two-dimensional high aspect ratio barrier filler. During the spraying stage, a directionally controllable magnetic field is simultaneously applied to achieve the orientation and alignment of the magnetic flux and the carbon nanotube network. An impedance matching layer compatible with a labyrinth diffusion barrier path is constructed through the gradient distribution of the barrier filler. Finally, after UV cross-linking curing and surface superhydrophobic nano-air layer trapping and sealing, a multilayer synergistic microwave absorbing and anti-corrosion film with a thickness of 10–200 μm is formed.

Description

Technical Field

[0001] This invention relates to the field of thin film material preparation technology, specifically to an apparatus and method for preparing a microwave absorbing and anti-corrosion thin film. Background Technology

[0002] Existing ship surface coating technologies generally suffer from the following problems: the absorbing coating and the anti-corrosion coating are independent of each other and are only combined through surface coverage, which leads to the long-term exposure of the internal absorbing material to the humid and hot salt spray environment of the ocean, making it prone to performance degradation or even corrosion failure; traditional absorbing materials are mostly magnetic metal powders or carbon-based materials, which are sensitive to corrosion in the marine environment, especially materials such as carbon-coated iron and ferrite, which will be accelerated to oxidize if they lack encapsulation protection; existing coatings cannot achieve spatial orientation assembly of absorbing components during the film formation stage, resulting in random distribution of electromagnetic loss channels, poor impedance matching, narrow absorption peaks, and insufficient bandwidth. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: a method for preparing a microwave absorbing and anti-corrosion film, comprising: Step 1, synthesis of magnetic nano-absorbing microcapsules encapsulated with PANI by Fe3O4: using the prepared components, under conditions of 20–35℃ and 40–70%RH (avoiding excessive dryness to prevent uneven surface polymerization) (room temperature acidic polymerization, which is conducive to uniform shell formation), Fe3O4 nanopowder is oxidized and polymerized in situ with aniline monomer in an acidic solution to form a PANI shell and a core-shell structure; Step 2, preparation of carbon nano-network microwave absorber: the carbon nano-network microwave absorber is formed by loading ferrite or carbon-coated iron nanoparticles onto carbon nanotubes or graphene powder; the preparation of the carbon nano-network microwave absorber is carried out under conditions of 15–40℃ and 30–80%RH; Step 3, introduction of two-dimensional barrier filler: the two-dimensional barrier filler contains Ti3C2T XStep 4: Preparation of composite slurry: The composite slurry is prepared by mixing Fe3O4 encapsulated with PANI magnetic nano-absorbing microcapsules, the carbon nano-network absorber from step 2, the two-dimensional barrier filler from step 3, with UV-curable epoxy or UV-curable polyurethane prepolymer, photoinitiator, and solvent; the composite slurry is prepared by stirring with a mechanical mixer for 1.5 h at a temperature of 20–45℃ and a humidity of 30–60%RH; Step 5: Magnetic field-assisted spray deposition: The composite slurry obtained in step 4 is sprayed using a spray gun; magnetic field-assisted spray deposition is carried out at a temperature of 10–40℃ and a humidity of 50–85%RH; Step 6: Construction of impedance matching layer: The two-dimensional barrier filler is controlled during the spray deposition stage. The gradient concentration distribution forms an impedance matching layer for microwave impedance matching and bandwidth extension; Step 7, UV curing film formation: The sprayed composite slurry is irradiated with a UV curing lamp to form an absorbing composite layer; the temperature of the irradiated area does not exceed 60℃, the irradiation time is 60s, and the ambient humidity is controlled at 30–80%RH; Step 8, superhydrophobic sealing layer preparation: A superhydrophobic polymer layer is coated or sprayed on the surface of the absorbing composite layer; the superhydrophobic sealing layer is prepared under the conditions of temperature 10–40℃ and humidity 30–60%RH; Step 9, Wait for the natural structure to stabilize at room temperature to form a microwave absorbing anti-corrosion film. The final microwave absorbing anti-corrosion film has a thickness of 10–200μm and is composed of an absorbing composite layer, an impedance matching layer, and a superhydrophobic sealing layer.

[0004] Preferably, step 1 takes 2 hours; the two-dimensional barrier filler introduced in step 3 can construct a labyrinthine diffusion path in the composite slurry due to its high aspect ratio.

[0005] Preferably, step 5 uses magnetic field-assisted spraying. During the magnetic field-assisted spraying deposition process, a magnetic field that can control the direction is applied simultaneously, so that the magnetic nano-absorbing microcapsules of Fe3O4 encapsulated by PANI are arranged into chain-like or network-like magnetic loss channels, and the carbon nanotubes or graphene are shear-oriented.

[0006] Preferably, in step 7, the UV-curable epoxy or UV-curable polyurethane prepolymer is cross-linked and cured to form a microwave absorbing composite layer; the superhydrophobic sealing layer is formed of fluorosilane-modified silicone or fluorinated polyurethane and has a nano-rough structure for trapping air.

[0007] Preferably, the components include a vortex mixing container, a storage box, and a flow guide ring, all of which are fixed to a support body; wherein a splash guard is fixedly installed on the top of the vortex mixing container, the splash guard has an opening, and a cover plate is movably installed on the opening.

[0008] Preferably, it also includes a first guide tube and a second guide tube, the top ends of which extend through the splash guard to the middle position above the vortex mixing container; wherein the bottom end of the first guide tube extends to the bottom of the vortex mixing container, and a filter nozzle is installed at the end of the first guide tube inside the vortex mixing container (the filter nozzle is mainly to prevent large clumps of particles from entering the first guide tube and avoiding blockage); wherein the bottom end of the second guide tube extends to the bottom surface of the storage box, and a gap is left between the bottom end of the second guide tube and the bottom surface of the inner wall of the storage box, and the storage box is also provided with a function for injecting aniline oil.

[0009] Preferably, the second pump body and the first pump body are connected in series in the middle sections of the first guide tube and the second guide tube, respectively.

[0010] Preferably, a drive inlet pipe is fixedly and sealed through the center of the bottom end of the vortex mixing container. A guide ring is coaxially arranged on the outer side of the bottom end of the drive inlet pipe. The guide ring is connected to the inside of the drive inlet pipe through at least four radial guide channels. A drive impeller is rotatably installed inside the drive inlet pipe. The drive impeller is driven by a drive motor fixedly installed on the outer shell of the drive inlet pipe.

[0011] Preferably, a plurality of equidistant circularly arranged helical short tubes are fixed between the bottom surface of the vortex mixing container and the guide ring. All the helical short tubes are arranged in a helical inclination and are used to connect the vortex mixing container with the interior of the guide ring.

[0012] Compared with the prior art, the present invention has the following advantages: (1) The present invention utilizes a magnetic field to drive the directional self-assembly of microcapsules in the spraying deposition stage to construct a directional microwave loss channel, solving the problems of narrow absorption peaks and insufficient bandwidth; (2) The present invention uses a high aspect ratio two-dimensional barrier filler to construct a labyrinthine diffusion path, realizing the path extension mechanism of corrosive media in ship coatings, significantly improving barrier performance; (3) The Fe3O4@PANI core-shell structure magnetic nano-absorbing microcapsule shell (PANI shell) of the present invention has both magnetic and inert protective capabilities, avoiding direct corrosion of the absorbing components in the marine environment, while also being the most The outer superhydrophobic sealing layer achieves seawater / salt spray isolation and self-cleaning, further improving corrosion resistance; (4) This invention utilizes the driving impeller, radial guide channel and spiral short tube to form a high-velocity tangential vortex suspension shear field, so that the magnetic nano Fe3O4 is in a stable three-dimensional suspension and tumbling state in the acid solution, avoiding sedimentation and agglomeration, and ensuring that the aniline salt oil droplets can achieve high-frequency and high-uniform interface contact with the Fe3O4 magnetic core in the high-speed vortex during the falling process, providing a continuous and stable micro-reaction interface for APS water-soluble oxidative polymerization; (5) This invention adopts the method of acid mist and aniline oil droplets colliding in the gas phase space, so that H +Upon entering the surface of aniline oil droplets, instantaneous protonation is achieved, forming positively charged aniline salt oil droplets. This process avoids the problems of slow acid-oil mixing, mass transfer runaway, reaction lag, and oil-water interference in traditional solution phases. This gas-phase instantaneous protonation pathway ensures that aniline is in a highly reactive protonated state before entering the eddy current levitation magnetic core reaction interface, and then rapidly combines with the Fe3O4 magnetic core during the subsequent descent via the charge adsorption interface, significantly improving the uniformity and integrity of the interfacial polymerized shell formation. Attached Figure Description

[0013] Figure 1 A component structure diagram for this invention is provided.

[0014] Figure 2 This is a cross-sectional view of the storage box structure of the present invention.

[0015] Figure 3 This is a structural diagram of the internal structure of the vortex mixing container of the present invention.

[0016] Figure 4 This is a structural diagram of the radial flow channel of the present invention.

[0017] In the diagram: 101-Vortex mixing container; 102-Splash shield; 103-Opening; 104-Cover plate; 105-Support body; 106-First guide pipe; 107-Second guide pipe; 108-First pump body; 109-Second pump body; 110-Spiral short pipe; 111-Storage box; 112-Guide ring; 113-Filter nozzle; 114-Drive inlet pipe; 115-Drive motor; 116-Radial guide channel; 117-Drive impeller. Detailed Implementation

[0018] The following is in conjunction with the appendix Figures 1-4 The technical solution of the present invention will be further illustrated through specific embodiments.

[0019] This invention provides a method for preparing a microwave absorbing and anti-corrosion film, comprising the following steps: Step 1: Synthesize magnetic nano-absorbing microcapsules using the prepared components (required time: 2 hours): Disperse Fe3O4 nanopowder in an acidic solution at a temperature of 20–35℃ and a humidity of 40–70%RH. Add aniline monomer and use ammonium persulfate (APS) for oxidative polymerization to generate a polyaniline shell in situ on the Fe3O4 surface, resulting in Fe3O4@PANI (Fe3O4 is encapsulated by PANI) core-shell structure magnetic nano-absorbing microcapsules. That is, generate a polyaniline shell in situ on the Fe3O4 surface to obtain Fe3O4@PANI core-shell particles. During the polymerization process, polyaniline is deposited on the surface of Fe3O4 to form a conductive shell, improving the compatibility between the particles and the polymer system and imparting certain corrosion resistance; Step 2, preparation of carbon nanotube network absorber: carbon nanotubes or graphene powder are selected as the main carbon-based absorber substrate because of their large specific surface area, strong dielectric loss, high conductivity and stability under harsh conditions. Magnetic nanoparticles can be loaded on the surface of the carbon material or in the network to enhance magnetic loss, and ferrite or carbon-coated iron nanoparticles can be loaded in the network to form a carbon nanotube network absorber; the preparation of the carbon nanotube network absorber is carried out at a temperature of 15–40℃ and a humidity of 30–80%RH; Step 3, introduction of two-dimensional barrier filler: two-dimensional nanomaterials are selected as two-dimensional barrier fillers, which include Ti3C2T X The composite slurry is prepared by mixing Fe3O4@PANI magnetic nano-absorbing microcapsules (from step 1), carbon nanotube network absorbers (from step 2), and two-dimensional barrier fillers (from step 3) with UV-curable epoxy or UV-curable polyurethane prepolymers, photoinitiators, and solvents. Microcapsule preservatives (such as benzotriazole inhibitors) can be added to the slurry to further enhance its anti-corrosion properties. This slurry contains both absorbing components (Fe3O4@PANI, CNTs) and barrier fillers (MXene sheets) and binding polymers. The composite slurry is prepared under conditions of 20–45℃ and 30–60%RH, using a mechanical stirrer for 1.5 hours.

[0020] Step 5, Magnetic Field-Assisted Spray Coating Deposition: A composite slurry is sprayed using a spray gun, and a controllable directional magnetic field is simultaneously applied at the nozzle or below the substrate. This causes the Fe3O4@PANI magnetic nano-absorbing microcapsules to align into chain-like or network-like magnetic loss channels, while simultaneously causing carbon nanotubes or graphene to shear and align. Specifically, a magnetic field-assisted spraying device is used to uniformly spray the composite slurry onto the surface of a ship substrate (such as steel plate). During spraying, a controllable magnetic field is applied simultaneously, causing magnetic particles such as Fe3O4@PANI to align in the flowing coating (e.g., chain-like assembly along the normal direction), forming a network-like or chain-like nanostructure. This directional alignment facilitates the formation of magnetic flux channels throughout the thin film, enhancing the synergy between magnetic and dielectric losses. Simultaneously, carbon nanotubes / graphene sheets align under shearing action, forming a conductive network. This process creates an interwoven hybrid structure between the absorbing components and the blocking two-dimensional materials, improving absorption and shielding effects. Magnetic Field-Assisted Spraying Device: An adjustable-intensity electromagnetic coil is placed near the spray gun to generate a controllable directional magnetic field at the nozzle or below the substrate. During operation, the composite slurry is injected into the nozzle and sprayed at high speed. Simultaneously, the electromagnetic coil is energized, and under the influence of the magnetic field, Fe3O4@PANI particles arrange themselves into chains in the sprayed fluid and deposit on the substrate. This device can precisely control the magnetic field strength and direction to achieve spatial directional assembly of microwave absorbing particles; magnetic field-assisted spraying deposition is carried out under conditions of temperature 10–40℃ and humidity 50–85%RH. Step 6, Impedance Matching Layer Construction: During the spraying deposition stage, the gradient concentration distribution of the two-dimensional barrier filler is controlled to form an impedance matching layer for microwave impedance matching and bandwidth extension.

[0021] Step 7, UV Curing Film Formation: The sprayed composite slurry is irradiated with a UV curing lamp to crosslink and cure the UV-curable epoxy or UV-curable polyurethane prepolymer, forming a microwave absorbing composite layer. The temperature of the irradiated area does not exceed 60℃, the irradiation time is 60s, and the ambient humidity is controlled at 30–80%RH. Step 8, Preparation of Superhydrophobic Sealing Layer: A superhydrophobic polymer layer is coated or sprayed onto the surface of the microwave absorbing composite layer. The superhydrophobic polymer layer contains fluorosilane-modified silicone or fluorinated polyurethane and constructs a nano-rough structure to capture the air layer, forming a superhydrophobic sealing layer. The superhydrophobic sealing layer is prepared under the conditions of temperature 10–40℃ and humidity 30–60%RH. Step 9, Waiting for the Natural Structure to Stabilize at Room Temperature to Form a Microwave Absorbing Anticorrosion Film: The microwave absorbing anticorrosion film is formed by the microwave absorbing composite layer, impedance matching layer, and superhydrophobic sealing layer, resulting in a microwave absorbing anticorrosion film with a thickness of 10–200μm.

[0022] The multiphase dielectric structure possesses both high dielectric (carbon-based network) and high magnetic permeability (ferrite microcapsules) loss channels, enabling the dual loss mechanisms to work synergistically. Multiple interfaces between the core-shell structure and the two-dimensional network enhance dielectric polarization, while nano / micron-sized scattering centers improve multiple reflections. Fe3O4 / CNT composites can achieve absorption peaks in the –40 dB range in thin layers. By optimizing the composition ratio and layer thickness, broadband absorption covering commonly used radar frequencies (GHz level) can be achieved, while impedance matching layer technology further expands the absorption bandwidth.

[0023] The polymer matrix and two-dimensional sheets in the composite structure provide physical barriers, increasing ion migration paths; the superhydrophobic surface reduces the saltwater contact area. Even if the film suffers minor scratches, the contained microencapsulated anti-corrosion agents and hydrophilic polymer layers can release or adsorb corrosive ions, achieving a self-healing effect. All materials used are resistant to the high humidity environment of seawater; in particular, the PANI shell in the core-shell particles has chemical stability that inhibits corrosion. The film can be used for a long time in salt spray, high humidity, and corrosive gas environments, meeting the operational requirements of ships. Through the design of nanocomposite materials and magnetron sputtering assembly processes, a deep integration of wave absorption and corrosion protection functions is achieved, meeting both the wave absorption requirements of marine ship surfaces and ensuring long-term stability in complex marine environments.

[0024] The preparation of the microwave absorbing and anti-corrosion film involves manufacturing a component, including a vortex mixing container 101, a storage box 111, and a flow guide ring 112. The vortex mixing container 101, the storage box 111, and the flow guide ring 112 are all fixed on the support body 105. A splash shield 102 is fixedly installed on the top of the vortex mixing container 101. An opening 103 is provided on the splash shield 102, and a cover plate 104 is movably installed on the opening 103. It also includes a first guide tube 106 and a second guide tube 107. The top ends of the first guide tube 106 and the second guide tube 107 extend through the splash guard 102 to the middle position above the vortex mixing container 101. The bottom end of the first guide tube 106 extends to the bottom of the vortex mixing container 101, and a filter nozzle 113 is installed at the end of the first guide tube 106 inside the vortex mixing container 101 (the filter nozzle 113 is mainly to prevent large clumps of particles from entering the first guide tube 106 and causing blockage). The bottom end of the second guide tube 107 extends to the bottom surface of the storage box 111, and a gap is left between the bottom end of the second guide tube 107 and the bottom surface of the inner wall of the storage box 111. The storage box 111 also has an opening for injecting aniline oil. A second pump body 109 and a first pump body 108 are respectively connected in series in the middle part of the first guide tube 106 and the second guide tube 107. A drive inlet pipe 114 is fixedly and sealed through the center of the bottom end of the vortex mixing container 101. A guide ring 112 is coaxially arranged on the outer side of the bottom end of the drive inlet pipe 114. The guide ring 112 is connected to the inside of the drive inlet pipe 114 through at least four radial guide channels 116. A drive impeller 117 is rotatably installed inside the drive inlet pipe 114. The drive impeller 117 is driven by a drive motor 115 fixedly installed on the outer shell of the drive inlet pipe 114. A plurality of equidistant circularly arranged spiral short tubes 110 are fixed between the bottom surface of the vortex mixing container 101 and the guide ring 112. All spiral short tubes 110 are spirally inclined and are used to connect the vortex mixing container 101 to the inside of the guide ring 112.

[0025] First, the acidic solution is prepared: the cover plate 104 is opened from the splash guard 102, and an acidic aqueous solution containing hydrochloric acid or sulfuric acid is added to the vortex mixing container 101. The pH is controlled within the range of 0.5–2.5 to allow aniline to be protonated. Then, Fe3O4 nanoparticles are evenly sprinkled into the acidic solution and suspended in a micro-vortex manner to ensure that the Fe3O4 nanoparticles are stably vortex-suspended in the acidic solution without settling. Specifically, the drive motor 115 is started (the cover plate 104 needs to be closed before operation). The output shaft of the drive motor 115 drives the drive impeller 117 to rotate. The drive impeller 117 forces the acidic solution inside the vortex mixing container 101 into the radial guide channel 116 through the drive inlet pipe 114. Then, it is guided to the guide ring 112 through the radial guide channel 116. Finally, it is sprayed into the vortex mixing container 101 along the spiral tangential direction through the spiral short pipe 110. The spiral short pipe 110 is located at one end of the vortex mixing container 101 with a narrow opening, which is used to increase the flow rate of the acidic solution into the vortex mixing container 101, so that all the acidic solution inside the vortex mixing container 101 rotates, preventing the Fe3O4 nanopowder from precipitating. Subsequently, the first pump body 108 and the second pump body 109 are activated. The first pump body 108 is activated to draw aniline oil from the storage box 111 into the top of the second guide pipe 107, which is equipped with an atomizing nozzle. The second pump body 109 is activated to draw acidic melt from the vortex mixing container 101 into the top of the first guide pipe 106, which is also equipped with an atomizing nozzle. The acid mist enters the gas phase space above the container in the form of acid mist co-spray. The acid mist consists of droplets of an acidic solution. When the acid mist droplets collide with the aniline oil droplets in the spraying gas phase space, the aniline is instantaneously protonated, forming positively charged aniline salt droplets (hydrogen ions in the acid water (H+)). +The aniline enters the surface of the aniline oil droplet, transforming the aniline into an aniline salt state. The aniline salt is positively charged, but it remains in the form of an oil droplet; it simply becomes a positively charged oil droplet, not water, nor does it become an oil-water mixture. During its descent, the oil droplet contacts the interface of the Fe3O4 nanoparticles suspended in an eddy current. Ammonium persulfate (APS) is added to the micro-reaction interface as a water-soluble oxidant (not a solid melt), oxidizing and polymerizing the aniline salt in situ at the Fe3O4 surface interface to form a polyaniline (PANI) shell. The eddy current suspension is maintained for 30–180 seconds, allowing the PANI shell to uniformly and completely cover the Fe3O4 magnetic core surface, resulting in a polyaniline-shell-coated magnetite magnetic nanocapsule. In this process, the oil droplets are less dense than water, so they will not sink to the bottom like an iron ball. Instead, they will be carried by the eddies (vortices formed by stirring) and roll in the solution, coming into contact with the surface of the Fe3O4 particles (interfacial contact). This process is similar to many small oil droplets of chocolate syrup being sprayed into the water flow of a high-speed rotating washing machine. The oil droplets will not sink to the bottom, but will be rolled around by the water flow and continuously come into contact with the surface of the clothes.

Claims

1. A method for preparing a microwave absorbing and anti-corrosion film, characterized in that, Includes the following steps: Step 1: Synthesis of magnetic nano-absorbing microcapsules encapsulated with PANI by Fe3O4: Fe3O4 nanopowder was mixed with aniline monomer in an acidic solution with APS oxidative polymerization at a temperature of 20–35℃ and a humidity of 40–70%RH to generate a PANI shell in situ, forming a core-shell structure. Step 2, Preparation of carbon nanotube network absorber: The carbon nanotube network absorber is formed by loading ferrite or carbon-coated iron nanoparticles onto carbon nanotubes or graphene powder; the preparation of the carbon nanotube network absorber is carried out under the conditions of temperature 15–40℃ and humidity 30–80%RH. Step 3, Introduction of two-dimensional barrier packing: The two-dimensional barrier packing contains Ti3C2T X MXene sheets or graphene oxide sheets; Step 4, Preparation of composite slurry: The composite slurry is prepared by mixing Fe3O4 magnetic nano-absorbing microcapsules encapsulated with PANI, the carbon nano-network absorber from step 2, the two-dimensional barrier filler from step 3, with UV-curable epoxy or UV-curable polyurethane prepolymer, photoinitiator, and solvent; the composite slurry is prepared by stirring with a mechanical mixer for 1.5 h at a temperature of 20–45℃ and a humidity of 30–60%RH. Step 5, Magnetic field-assisted spray deposition: The composite slurry obtained in step 4 is sprayed using a spray gun; magnetic field-assisted spray deposition is carried out under the conditions of temperature 10–40℃ and humidity 50–85%RH. Step 6, Impedance matching layer construction: During the spray deposition stage, the gradient concentration distribution of the two-dimensional barrier filler is controlled to form an impedance matching layer for microwave impedance matching and bandwidth extension. Step 7, UV curing film formation: Use a UV curing lamp to irradiate the sprayed composite slurry to form a microwave absorbing composite layer; the temperature of the irradiated area should not exceed 60℃, the irradiation time should be 60s, and the ambient humidity should be controlled at 30–80%RH. Step 8: Preparation of superhydrophobic sealing layer: Coating or spraying a superhydrophobic polymer layer onto the surface of the microwave absorbing composite layer; the preparation of the superhydrophobic sealing layer is carried out under the conditions of temperature 10–40℃ and humidity 30–60%RH. Step 9: Wait at room temperature for the natural structure to stabilize and form a microwave absorbing and anti-corrosion film.

2. The method for preparing a microwave absorbing and anti-corrosion film according to claim 1, characterized in that: Step 1 takes 2 hours; the introduction of two-dimensional barrier filler in step 3 can create a labyrinthine diffusion path in the composite slurry due to its high aspect ratio.

3. The method for preparing a microwave absorbing and anti-corrosion film according to claim 1, characterized in that: Step 5 uses magnetic field-assisted spraying. During the magnetic field-assisted spraying deposition process, a magnetic field that can control the direction is applied simultaneously, so that the magnetic nano-absorbing microcapsules of Fe3O4 encapsulated by PANI are arranged into chain-like or network-like magnetic loss channels, and the carbon nanotubes or graphene are shear-oriented.

4. The method for preparing a microwave absorbing and anti-corrosion film according to claim 1, characterized in that: In step 7, UV-curable epoxy or UV-curable polyurethane prepolymers are cross-linked and cured to form a microwave absorbing composite layer; the superhydrophobic sealing layer is formed by fluorosilaneized silicone or fluorine-modified polyurethane and has a nano-rough structure for trapping air.

5. The equipment used in the method for preparing a microwave absorbing and anti-corrosion film according to claim 1, characterized in that: The components include a vortex mixing container (101), a storage box (111), and a flow guide ring (112). The vortex mixing container (101), the storage box (111), and the flow guide ring (112) are all fixed on the support body (105). A splash shield (102) is fixedly installed on the top of the vortex mixing container (101). An opening (103) is opened on the splash shield (102), and a cover plate (104) is movably installed on the opening (103).

6. The equipment used in the method for preparing a microwave absorbing and anti-corrosion film according to claim 5, characterized in that: It also includes a first guide tube (106) and a second guide tube (107), the top ends of the first guide tube (106) and the second guide tube (107) extending through the splash shield (102) to the middle position above the vortex mixing container (101); The bottom end of the first guide tube (106) extends to the bottom of the vortex mixing container (101), and a filter nozzle (113) is installed at one end of the first guide tube (106) inside the vortex mixing container (101); the bottom end of the second guide tube (107) extends to the bottom surface inside the storage box (111).

7. The equipment used in the method for preparing a microwave absorbing and anti-corrosion film according to claim 6, characterized in that: The second pump body (109) and the first pump body (108) are respectively connected in series in the middle part of the first guide tube (106) and the second guide tube (107).

8. The equipment used in the method for preparing a microwave absorbing and anti-corrosion film according to claim 7, characterized in that: A drive inlet pipe (114) is fixedly and sealed at the center of the bottom of the vortex mixing container (101). A guide ring (112) is coaxially arranged on the outer side of the bottom of the drive inlet pipe (114). The guide ring (112) is connected to the inside of the drive inlet pipe (114) through at least four radial guide channels (116). A drive impeller (117) is rotatably installed inside the drive inlet pipe (114). The drive impeller (117) is driven by a drive motor (115) fixedly installed on the outer shell of the drive inlet pipe (114).

9. The equipment used in the method for preparing a microwave absorbing and anti-corrosion film according to claim 8, characterized in that: A plurality of helical short tubes (110) arranged in an equidistant circular array are fixed between the bottom surface of the vortex mixing container (101) and the guide ring (112). All the helical short tubes (110) are arranged in a helical inclination and are used to connect the vortex mixing container (101) with the interior of the guide ring (112).

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