A laser-processed honeycomb energy-saving electrothermal deicing surface and a preparation method thereof

Abstract

This invention discloses a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface and its preparation method, belonging to the field of metal surface laser beam processing technology. The honeycomb-type energy-saving electrothermal anti-icing surface is prepared by bonding an HMPC microstructure surface, after low surface energy treatment, to an electrothermal layer. The HMPC microstructure layer has a hexagonal hollow micropillar structure array processed by femtosecond laser; the electrothermal layer is prepared by bonding insulating polyimide layers to both sides of the MWCNTs / AgNWs electrothermal film. The honeycomb-type energy-saving electrothermal anti-icing surface prepared by this invention has excellent anti-icing / de-icing capabilities. The structural layer forms a stable heat insulation layer by increasing the specific surface area, which, together with the electrothermal layer, achieves efficient heat storage and slow release. Under an applied voltage of 1V, ice melting is achieved within 64s. The surface ice adhesion strength is tested to be 0.96kPa, which is only 0.0138 times that of pure aluminum surface, avoiding the defects of intermittent ice melting and interrupted heating in mainstream reverse circulation defrosting technology.

Description

Technical Field

[0001] This invention belongs to the field of laser beam processing technology for metal surfaces. More specifically, this invention relates to a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface and its preparation method. Background Technology

[0002] Air source heat pumps and air conditioning equipment are widely used in building heating, cooling, and industrial temperature control. Their core outdoor heat exchange component is an aluminum finned tube heat exchanger. Aluminum alloys, with their high thermal conductivity, low density, ease of stamping, low cost, and resistance to atmospheric corrosion, have become the preferred material for air source heat pumps and air conditioner finned heat exchangers. However, during winter heating operation, the outdoor heat exchanger acts as an evaporator. The refrigerant evaporates and absorbs heat inside the tubes, causing the fin surface temperature to drop significantly below the ambient air dew point and freezing point. Water vapor in the air continuously condenses, frosts, and further forms an ice layer on the fin surface.

[0003] Aluminum fins have a compact structure and narrow gaps. When frost or ice forms on the surface, it increases airflow resistance, reducing the effective heat exchange area. Furthermore, the thermal conductivity of ice is much lower than that of aluminum alloy, creating additional thermal resistance. This leads to decreased heat exchange efficiency, increased power consumption, and a lower energy efficiency ratio, affecting normal operation. In addition, the volume expansion of ice during growth and freeze-thaw cycles directly causes aluminum fins to be squeezed, flattened, deformed, or even fail, significantly reducing heat exchange efficiency and shortening equipment lifespan. Therefore, in-situ fabrication of a highly efficient anti-icing surface on the aluminum material, inhibiting icing on the fin surface at its source, has significant engineering application value for improving the operational stability and reliability of air source heat pumps and air conditioning systems.

[0004] Traditional hydrophobic and anti-corrosion coatings only provide passive waterproofing and auxiliary defrosting, lacking active heating and anti-icing capabilities. They will still rapidly frost and freeze in low-temperature, high-humidity environments, failing to inhibit ice formation at its source. Furthermore, due to the lack of microstructural design on the surface, they cannot create a cavitation-locking effect, failing to delay droplet condensation and nucleation. They also lack the ability to desorb or release stress when facing ice, resulting in strong adhesion to the fins once frozen. Some equipment addresses these issues by adding heating elements to the bottom of the fins for defrosting; however, this method only achieves localized, concentrated heating with uneven heat distribution. Areas near the heating elements are prone to damage due to excessive temperature, posing a safety hazard, while areas further away from the heating elements experience incomplete defrosting and de-icing, with large temperature differences leading to fin aging and deformation.

[0005] Currently, the mainstream defrosting technologies in air source heat pumps and industrial heat exchangers are mainly reverse cycle defrosting and hot gas bypass defrosting. These methods switch the refrigeration cycle to turn the outdoor heat exchanger into a condenser, using the high-temperature refrigerant vapor discharged from the compressor to heat the fins and melt the ice, thus restoring heat exchange performance. However, this technology suffers from the core problems of intermittent defrosting and interrupted heating. Furthermore, defrosting is delayed and incomplete, failing to fundamentally solve the problem of low-temperature frost blockage. It also generates high energy consumption to overcome the latent heat of ice and results in heat loss. Summary of the Invention

[0006] One object of the present invention is to solve at least the above-mentioned problems and / or defects, and to provide at least the advantages described below.

[0007] To achieve these and other advantages according to the present invention, the present invention provides a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface, comprising: HMPC surface microstructure, its surface is processed with a hexagonal hollow micropillar structure array by femtosecond laser processing; An electrothermal layer is bonded to the bottom surface of the microstructure on the HMPC surface; the structure of the electrothermal layer includes: MWCNTs / AgNWs electrothermal film, with insulating polyimide layers bonded to both sides of the film.

[0008] Preferably, the material of the HMPC surface microstructure is AA8011 aluminum alloy.

[0009] A method for preparing a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface includes the following steps: Step 1: Using a femtosecond laser processing system, the laser wavelength, pulse width, and pulse frequency are set. First, hexagonal micropillar structures are scanned on the surface of AA8011 aluminum alloy, and multiple hexagonal micropillar structures form a hexagonal micropillar array. Hexagonal array micropits are obtained by scanning the top of each hexagonal micropillar structure using a single-point exposure method. The prepared HMPC surface microstructure is placed in a hydrothermal reactor and then immersed in a mixed solution of 1H,1H,2H,2H-perfluorodecyltriethoxysilane and ethanol for low surface energy treatment, and then dried for later use. Step 2: Mix polyvinylpyrrolidone solution and multi-walled carbon nanotube powder, and ultrasonically disperse to obtain multi-walled carbon nanotube dispersion; add silver nanowire solution to multi-walled carbon nanotube dispersion, and ultrasonically disperse to obtain MWCNTs / AgNWs solution; pour MWCNTs / AgNWs solution onto polyimide film, remove air bubbles by vacuuming, and vacuum solidify to obtain MWCNTs / AgNWs electrothermal film; Step 3: Adhere polyimide layers to both sides of the MWCNTs / AgNWs electrothermal film to obtain an electrothermal layer. Adhere the electrothermal layer to the surface of the HMPC surface microstructure. The bonding surface is the bottom surface without the hexagonal micro-pillar structure array, resulting in a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface.

[0010] Preferably, in step one, the wavelength of the laser is 700nm~900nm, the pulse width is 100fs~110fs, and the pulse frequency is 0.5kHz~1.5kHz.

[0011] Preferably, in step one, when scanning the hexagonal micropillar structure, the laser processing power is 40mW~60mW, the scanning speed is 4mm / s~6mm / s, and the number of scans is 4~6; the length of the hexagonal micropillar is 70μm~90μm, the height is 90μm~110μm, and the distance between two adjacent hexagonal micropillars is 10μm~30μm.

[0012] Preferably, in step one, when scanning the micro-pits on the top of the hexagonal micropillar structure, the single-point exposure time is set to 9000μs~11000μs, the scanning diameter is 5μm~15μm, and the micropore depth is 40μm~60μm.

[0013] Preferably, in step one, the volume ratio of 1H,1H,2H,2H-perfluorodecyltriethoxysilane to ethanol is 1:40~60, the immersion time is 1h~3h, the drying temperature is 70℃~90℃, and the drying time is 3h~5h.

[0014] Preferably, in step two, the concentration of the polyvinylpyrrolidone solution is 0.4wt%~0.6wt%. The inner diameter of multi-walled carbon nanotubes is 3nm~5nm, and the outer diameter is 8nm~15nm; The mass ratio of polyvinylpyrrolidone to multi-walled carbon nanotubes is 4~6:1.

[0015] Preferably, in step two, the mass ratio of multi-walled carbon nanotubes to silver nanowires is 4~6:1~3; and the concentration of the silver nanowire solution is 5mg / mL~15mg / mL.

[0016] Preferably, in step two, the vacuuming time is 2 min to 4 min; the vacuum curing temperature is 70℃ to 90℃; and the vacuum curing time is 1 h to 3 h.

[0017] The present invention includes at least the following beneficial effects: The present invention fabricates a honeycomb micropillar structure (HMPC) with a mosquito compound eye arrangement on an aluminum alloy substrate based on a femtosecond laser processing method. The surface of this structure achieves a contact angle of 161° and a roll-off angle of 2°. Then, it is combined with a MWCNTs / AgNWs thin film with a sheet resistance of 3.1Ω / sq. The prepared electrothermal superhydrophobic surface (MA-HMPC) is endowed with excellent electrothermal effect and anti-icing / de-icing function.

[0018] 1. Surface microstructure anti-icing / de-icing ability: After hydrothermal treatment, the surface microstructure of HMPC forms a dense nanosheet structure, which further reduces the contact area between the surface and the droplets and increases the air layer. It exhibits a super-repulsive state for water droplets (contact angle >150°), and also exhibits a repulsive state for liquids with different surface tensions (olive oil, rainwater, etc.), thus having excellent anti-icing ability.

[0019] 2. Low energy consumption and rapid heating: The thin sheet bonding between the aluminum alloy substrate and the heating layer, based on the thermal conductivity of the aluminum alloy itself, significantly accelerates the heat transfer speed from the heating layer to the superhydrophobic surface, enabling the heat generated by the heating film to be used efficiently and greatly reducing the impact of ice layer on heat exchange efficiency.

[0020] 3. Heat storage and ice melting: The top is combined with micro-pits to prepare a honeycomb-like micro-nano structure. The micro-pits and walls increase the specific surface area, trapping more air. Relying on its low heat transfer coefficient, it can achieve heat preservation and heat storage effects.

[0021] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0022] Figure 1 The surface morphology image of the HMPC surface microstructure prepared in Example 1; Figure 2 This is a schematic diagram of the integration of the HMPC surface microstructure and the electrothermal layer; Figure 3 The diagram shows the different states of surface droplets on the HMPC surface microstructure under external pressure. Figure 4 A schematic diagram showing the transition of the solid-liquid contact state from the pinned Wenzel state to the stable Cassie-Baxter state in the laser-processed honeycomb energy-saving electrothermal anti-icing surface; Figure 5 The surface contact angle and sliding angle of the HMPC surface microstructure; Figure 6 A comparison of the effects of the freezing-de-icing cycle on the ice adhesion strength of each sample; Figure 7This is a real-life photograph of the delayed icing experiment on the surface microstructure of HMPC. Figure 8 The relationship between the surface temperature of the honeycomb-type energy-saving electric heating anti-icing surface and the applied voltage; Figure 9 This is a real-life photo of an electrothermal de-icing experiment on a honeycomb-type energy-saving electrothermal anti-icing surface. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0024] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof. Example 1 A method for preparing a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface includes the following steps: Step 1: Using AA8011 aluminum alloy as the substrate, a femtosecond laser processing system is used for processing. The laser wavelength is set to 800nm, the pulse width to 104fs, and the pulse frequency to 1kHz. First, the laser processing power is set to 50mW, the scanning speed to 5mm / s, and the number of scans to 5 times. Hexagonal micropillar structures are scanned on the surface of the AA8011 aluminum alloy. The side length of the hexagonal micropillar structure is 80μm, the height is 100μm, and the spacing between two adjacent hexagonal micropillar structures is 20μm. Secondly, the single-point exposure time was set to 10000 μs, and micro-pits with a diameter of 10 μm and a depth of 50 μm, arranged in a hexagonal array, were scanned on the top of the hexagonal micropillar structure; the prepared HMPC surface microstructure is as follows. Figure 1 As shown; the processed sample was placed in a hydrothermal reactor and treated at 120°C for 2 hours; The sample was immersed in a 1:50 mixed solution of 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFTS) and ethanol for 2 hours to perform low surface energy treatment. Finally, it was dried at 80℃ for 4 hours to obtain the HMPC surface microstructure. Step 2: First, weigh polyvinylpyrrolidone (PVP) and multi-walled carbon nanotube (MWCNT) powders at a mass ratio of 5:1. The inner diameter of the MWCNT powders is 3nm~5nm and the outer diameter is 8nm~15nm. Then, add PVP to ultrapure water to prepare a 0.5wt% PVP solution. Add the weighed MWCNT powder to obtain a mixed system. Disperse the mixed system ultrasonically for 2 hours to obtain a 0.1wt% MWCNT dispersion. A 10 mg / mL silver nanowire solution was added to the multi-walled carbon nanotube dispersion at a mass ratio of 5:2 to multi-walled carbon nanotube powder, and ultrasonic dispersion was continued for 10 min to ensure that the silver nanowires were evenly distributed in the multi-walled carbon nanotube dispersion, thus obtaining a MWCNTs / AgNWs solution. Finally, the solution was poured onto a polyimide (PI) film and vacuumed for 3 minutes to remove air bubbles. After curing at 80°C for 2 hours in a vacuum oven, an electrothermal film with electrothermal properties, MWCNTs / AgNWs, was obtained.

[0025] Step 3: The bonding process between the superhydrophobic HMPC surface microstructure and the electrothermal layer is as follows: Figure 2 As shown, the HMPC surface microstructure and the electrothermal layer are bonded together with polyimide (PI) double-sided adhesive. The bonding surface of the electrothermal layer is the bottom surface of the HMPC surface microstructure without the hexagonal micropillar structure array. The electrothermal layer is a sandwich structure of PI + MWCNTs / AgNWs electrothermal film + PI, thus obtaining a honeycomb-type energy-saving electrothermal anti-icing surface (MA-HMPC) that combines electrothermal performance and superhydrophobicity. The PI film has high temperature resistance and heat uniformity, which can uniformly conduct the heat generated by the electrothermal layer to the surface layer.

[0026] Comparative Example 1 The difference between this comparative example and Example 1 is that this comparative example uses a femtosecond laser to process only the hexagonal micropillar structure on an AA8011 aluminum alloy substrate, without processing the micro-pit structure on top of the hexagonal micropillar structure. Furthermore, the process parameters for processing the hexagonal micropillar structure and the methods and parameters for the remaining steps are the same as in Example 1. The surface microstructure obtained in this comparative example is denoted as HMC.

[0027] Comparative Example 2 The difference between this comparative example and Example 1 is that the micro-pits in this comparative example are directly processed on an AA8011 aluminum alloy substrate using a femtosecond laser, without processing the hexagonal micro-pillar structure. Furthermore, the process parameters for processing the micro-pits and the methods and process parameters for the remaining steps in this comparative example are the same as in Example 1. The surface microstructure obtained in this comparative example is denoted as HMP.

[0028] Electrothermal de-icing test: The honeycomb energy-saving electrothermal anti-icing surface sample prepared in Example 1 was placed on a cooling stage, and a 10 μL droplet was added to the surface. The electrothermal layer was connected to a DC power supply, and the voltage was set to 1V. The cooling stage and the DC power supply were turned on, and the state of the droplet was recorded in real time by a polarization camera.

[0029] The mosquito-eye-like micro-pit structure on the HMPC surface effectively traps internal air pockets and inhibits gas escape, forming a stable air layer at the solid-liquid interface. This makes it difficult for liquid to penetrate the microstructure, allowing the surface to maintain a Cassie-Baxter state for a long time, achieving stable superhydrophobicity. Under external pressure, liquid droplets exhibit different states on the HMPC surface microstructure, such as... Figure 3 As shown in the figure, (a) is the low-pressure state, at which time the liquid-gas interface is slightly concave at the groove, generating a low Laplace pressure P1; (b) is the state after the pressure increases, the droplet penetrates into the groove, the interface curvature increases, and the Laplace pressure increases to P2; (c) is the critical high-pressure state, the interface contacts the bottom of the micropore, a topological change occurs to form an annular interface, generating an outward counterpressure P3; when the pressure exceeds the critical value, the interface tilts asymmetrically, and the contact line moves along the sidewall, corresponding to the state shown in (d).

[0030] When an ice layer has formed on the surface, the MWCNTs / AgNWs electrothermal film heats up rapidly after being energized, preferentially melting the underlying region where the ice layer contacts the microstructure surface. This promotes the transition of the solid-liquid contact state from the pinned Wenzel state to the stable Cassie-Baxter state, such as... Figure 4 As shown, after the contact surface melts and forms a water film, the adhesion strength between the ice layer and the surface is greatly reduced, and it can automatically detach under its own gravity, thus achieving rapid, gentle, and low-energy active de-icing.

[0031] This invention achieves efficient heat storage and slow release, while avoiding the defects of mainstream reverse-cycle defrosting technology, such as intermittent ice melting and interrupted heating. This invention utilizes femtosecond laser processing to fabricate a honeycomb micropillar structure (HMPC) on an aluminum alloy substrate, mimicking the compound eye arrangement of a mosquito. This structure achieves a contact angle of 161° and a roll-off angle of 2° on its surface. Figure 5 As shown, it was then combined with an electrothermal film of MWCNTs / AgNWs with a sheet resistance of 3.1Ω / sq, and the prepared honeycomb-type energy-saving electrothermal anti-icing surface (MA-HMPC) was endowed with excellent electrothermal effect and anti-icing / de-icing function.

[0032] Anti-icing / De-icing Capacity of Surface Microstructure: After hydrothermal treatment, the HMPC surface microstructure forms a dense nanosheet structure, further reducing the contact area between the HMPC surface microstructure and droplets and increasing the air layer. This results in a super-repulsive state towards water droplets (contact angle > 150°), and also exhibits repulsion towards liquids with different surface tensions (olive oil, rainwater, etc.), demonstrating excellent anti-icing capabilities. It is generally believed that surfaces with ice adhesion strength below 10 kPa are likely to allow ice to detach naturally under external forces, making surface ice easier to remove. Tests show that the average ice adhesion strength of the HMPC surface is only 0.96 kPa, which is 0.0138 times that of pure aluminum surfaces. Figure 6 As shown, compared to surfaces with only hexagonal micropillar structures (HMC) and only micropit structures (HMP), the surface ice adhesion strength remained below 5 kPa after 15 cycles. Figure 7 As shown, without surface heating, at an ambient temperature of -15℃ and humidity of 90%, the HMPC surface superhydrophobicity alone can achieve an icing delay time of 1998s, which is 13.5 times that of pure aluminum. Furthermore, due to the axial consistency of the surface microstructure, even if the surface is worn, the basic shape of the surface micro / nano structure will not change, maintaining superhydrophobicity and exhibiting excellent durability.

[0033] Low energy consumption and rapid heating: The thin-film bonding of the structural layer and the conductive layer, based on the thermal conductivity of the aluminum alloy itself, significantly accelerates the heat conduction from the electrothermal layer to the superhydrophobic surface, allowing the heat generated by the electrothermal film to be utilized efficiently, such as... Figure 8 As shown, when external voltages of 1V, 1.5V, 2V, and 2.5V are applied within 15 seconds, the equilibrium temperature of the sample surface increases with increasing voltage, rising from an initial 25℃ to 43.3℃, ​​69℃, 93.4℃, and 134℃ respectively, corresponding to temperature rise rates of 1.22℃ / s, 2.93℃ / s, 4.56℃ / s, and 7.27℃ / s, demonstrating a significant temperature rise advantage. Specifically, when the applied voltage is 1V, the power density is 0.09W / cm³. 2 This allows droplets to remain in a non-icing state on superhydrophobic surfaces, with corresponding de-icing performance such as... Figure 9 As shown, ice can be melted within 64 seconds, greatly reducing the impact of ice on heat exchange efficiency.

[0034] Heat storage and ice melting: The top is combined with micro-pits to prepare a honeycomb-like micro-nano structure. The micro-pits and walls increase the specific surface area, trapping more air. Relying on its low heat transfer coefficient, it can achieve heat preservation and heat storage effects.

[0035] The number of devices and processing scale described herein are for the purpose of simplifying the description of the invention. Applications, modifications, and variations of the invention will be readily apparent to those skilled in the art.

[0036] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A laser-processed honeycomb-type energy-saving electrothermal anti-icing surface, characterized in that, include: HMPC surface microstructure, its surface is processed with a hexagonal hollow micropillar structure array by femtosecond laser processing; An electrothermal layer is bonded to the bottom surface of the microstructure on the HMPC surface; the structure of the electrothermal layer includes: MWCNTs / AgNWs electrothermal film, with insulating polyimide layers bonded to both sides of the film.

2. The laser-processed honeycomb-type energy-saving electrothermal anti-icing surface as described in claim 1, characterized in that, The surface microstructure of the HMPC is made of AA8011 aluminum alloy.

3. A method for preparing a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface as described in any one of claims 1-2, characterized in that, Includes the following steps: Step 1: Using a femtosecond laser processing system, the laser wavelength, pulse width, and pulse frequency are set. First, hexagonal micropillar structures are scanned on the surface of AA8011 aluminum alloy, and multiple hexagonal micropillar structures form a hexagonal micropillar array. Hexagonal array micropits are obtained by scanning the top of each hexagonal micropillar structure using a single-point exposure method. The prepared HMPC surface microstructure is placed in a hydrothermal reactor and then immersed in a mixed solution of 1H,1H,2H,2H-perfluorodecyltriethoxysilane and ethanol for low surface energy treatment, and then dried for later use. Step 2: Mix polyvinylpyrrolidone solution and multi-walled carbon nanotube powder, and ultrasonically disperse to obtain multi-walled carbon nanotube dispersion; add silver nanowire solution to multi-walled carbon nanotube dispersion, and ultrasonically disperse to obtain MWCNTs / AgNWs solution; pour MWCNTs / AgNWs solution onto polyimide film, remove air bubbles by vacuuming, and vacuum solidify to obtain MWCNTs / AgNWs electrothermal film; Step 3: Adhere polyimide layers to both sides of the MWCNTs / AgNWs electrothermal film to obtain an electrothermal layer. Adhere the electrothermal layer to the surface of the HMPC surface microstructure. The bonding surface is the bottom surface without the hexagonal micro-pillar structure array, resulting in a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface.

4. The method for preparing a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface as described in claim 3, characterized in that, In step one, the wavelength of the laser is 700nm~900nm, the pulse width is 100fs~110fs, and the pulse frequency is 0.5kHz~1.5kHz.

5. The method for preparing a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface as described in claim 3, characterized in that, In step one, when scanning the hexagonal micropillar structure, the laser processing power is 40mW~60mW, the scanning speed is 4mm / s~6mm / s, and the number of scans is 4~6. The length of the hexagonal micropillar is 70μm~90μm, the height is 90μm~110μm, and the distance between two adjacent hexagonal micropillars is 10μm~30μm.

6. The method for preparing a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface as described in claim 3, characterized in that, In step one, when scanning the micro-pits on the top of the hexagonal micropillar structure, the single-point exposure time is set to 9000μs~11000μs, the scanning diameter is 5μm~15μm, and the micro-hole depth is 40μm~60μm.

7. The method for preparing a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface as described in claim 3, characterized in that, In step one, the volume ratio of 1H,1H,2H,2H-perfluorodecyltriethoxysilane to ethanol is 1:40~60, the immersion time is 1h~3h, the drying temperature is 70℃~90℃, and the drying time is 3h~5h.

8. The method for preparing a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface as described in claim 3, characterized in that, In step two, the concentration of the polyvinylpyrrolidone solution is 0.4wt%~0.6wt%. The inner diameter of multi-walled carbon nanotubes is 3nm~5nm, and the outer diameter is 8nm~15nm; The mass ratio of polyvinylpyrrolidone to multi-walled carbon nanotubes is 4~6:

1.

9. The method for preparing a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface as described in claim 3, characterized in that, In step two, the mass ratio of multi-walled carbon nanotubes to silver nanowires is 4~6:1~3; the concentration of the silver nanowire solution is 5mg / mL~15mg / mL.

10. The method for preparing a laser-processed honeycomb-type energy-saving electrothermal anti-icing surface as described in claim 3, characterized in that, In step two, the vacuuming time is 2 min to 4 min; the vacuum curing temperature is 70℃ to 90℃; and the vacuum curing time is 1 h to 3 h.

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