A white clover-like surface with ultra-low ice adhesion strength and its preparation method and application

Abstract

The application provides a white clover surface with super-low ice adhesion strength and a preparation method thereof, which comprises analyzing the relationship between the white clover surface structure and the super-hydrophobic cold resistance; copying the white clover surface structure, and processing periodic micropores on a base material by means of femtosecond laser direct writing; boiling the surface of the periodic micropores; and fluorinating the surface to modify it into a functional surface with super-hydrophobicity. The white clover surface with super-low ice adhesion strength has a micro-nano hierarchical structure, which comprises closely arranged larger micrometer-level periodic pore structures, smaller micrometer-level granular particles dispersedly distributed on the surface of the micropore structures, and densely distributed sub-micrometer-level sheet structures on the surface. The surface has super-hydrophobic low adhesion, the ice adhesion strength is as low as 1.08 kPa, the static icing prolonging time can reach 4 h, the dynamic frost prevention capacity can last for 5 h in a low-temperature and high-humidity environment, and the surface has good wear resistance and reusability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of anti-icing and deicing, and particularly relates to a pseudo-achillea leaf surface with super-low ice adhesion strength and a preparation method thereof. BACKGROUND

[0002] In cold winter, the solid surface is generally covered with ice, and the accumulation of ice will interfere with the operation of wind turbine blades, aircraft wings and electrical equipment, and bring great inconvenience to people's production and life, and even threaten people's life and health safety. How to efficiently and quickly remove the accumulated ice on the solid surface has become an important problem that people are concerned about. The existing anti-icing and deicing technologies mainly include chemical deicing, mechanical deicing, thermal deicing and the like, but these deicing technologies generally have the shortcomings of environmental unfriendliness, low efficiency and large energy consumption.

[0003] Anti-icing and deicing by using super-hydrophobic surface is a new technology in recent years. The biomimetic super-hydrophobic interface is widely reported to be used in the field of anti-icing and deicing due to its high water contact angle and low liquid adhesion. However, due to the instability of the super-hydrophobic state at low temperature, the liquid drop can easily pass through the air cushion, fully infiltrate into the micro-porous structure, and change from Cassie-Baxter state to Wenzel state, resulting in ice adhesion increasing and losing the effect of anti-icing and deicing. Therefore, it is still a challenge to design a super-hydrophobic surface with stable Cassie-Baxter state and endow it with super-low ice adhesion. SUMMARY

[0004] Many organisms in nature have evolved to form special wetting function interfaces to adapt to survival. It is found that achillea leaf is a widely distributed herbaceous plant, and the existence of micro-nano hierarchical structure and low surface energy wax layer on the upper surface of the leaf makes it have super-hydrophobic and low adhesion characteristics similar to lotus leaves, and can safely overwinter under snow cover, and has strong cold resistance. Inspired by this, the present application solves the above problems by designing a pseudo-achillea leaf super-hydrophobic surface.

[0005] In view of the problem that the instability of the super-hydrophobic state at low temperature easily leads to high ice adhesion, the purpose of the present application is achieved by the following technical scheme:

[0006] A pseudo-achillea leaf surface with super-low ice adhesion strength comprises a substrate, the surface of the substrate is micro-nano hierarchical structure by imitating the leaf of achillea leaf, uniform distribution of periodic micropores is arranged on the surface, the edges and inner walls of the micropores are randomly dispersed with micro-cluster structures of different sizes, and the surface of the micropores and the micro-cluster structures is closely arranged with sub-micron flaky structures; and the surface is modified by fluorination to present super-hydrophobicity and ice repellency.

[0007] Preferably, the substrate is an aluminum sheet or an aluminum alloy sheet with a thickness of greater than 100 μm.

[0008] Preferably, the micropores have the same size, a diameter of 24-30 μm, a depth of 19-37 μm, and a center-to-center distance of 26-33 μm.

[0009] Preferably, the micro-cluster structures have a diameter of 1-6 μm.

[0010] Preferably, the sub-micron flake structures have a width of 100-400 nm.

[0011] A method for preparing a white clover surface with super-low ice adhesion strength, comprising the following steps:

[0012] S1. Periodic micropores with the same size and spacing are machined on the surface of a substrate using a femtosecond laser, to obtain a surface with circular micropores and cluster structures; the laser beam of the femtosecond laser is perpendicular to the surface, and the laser beam is scanned on the surface in a parallel manner;

[0013] S2. The surface of the substrate treated in S1 is immersed in boiling water at 120℃ for a certain period of time using a boiling water treatment method, to obtain sub-micron flake structures densely distributed on the surface;

[0014] S3. The surface of the substrate treated in S2 is subjected to surface fluorination treatment to modify it into a surface with super-hydrophobicity.

[0015] Preferably, the laser spot diameter is 14 μm, the pulse energy is 40-70 mW, and the scanning time is 14,000-32,000 μs.

[0016] Preferably, the boiling water treatment time is 30-120 min.

[0017] Preferably, the surface fluorination treatment is modified using low-surface-energy 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane.

[0018] The application further provides an aluminum alloy skin with the white clover surface with super-low ice adhesion strength and its application in wind turbine blade deicing.

[0019] Preferably, the aluminum alloy skin is arranged on the surface of a wind turbine blade.

[0020] Preferably, the aluminum alloy skin with the super-low ice adhesion strength of the Trifolium repens surface is pasted on a wind turbine model blade, the wind turbine model is placed in a refrigerator with continuous spraying to simulate a low-temperature and high-humidity environment, the wind turbine model is started, and the blade is rotated at a constant speed to verify the effect of the super-low ice adhesion strength of the Trifolium repens surface provided in the application in the field of anti-icing and de-icing of wind turbines.

[0021] Preferably, the aluminum alloy skin with the super-low ice adhesion strength of the Trifolium repens surface is pasted on a wind turbine model blade, a 10 muL drop of ultrapure water is dropped on the aluminum alloy surface, and the drop is placed in a refrigerator to freeze into ice completely, then the wind turbine model is started, and the blade is rotated at a constant speed to verify the effect of the super-low ice adhesion strength of the Trifolium repens surface provided in the application in the field of ice removal of wind turbines.

[0022] The surface with the super-low ice adhesion strength and the preparation method thereof provided in the application have at least the following beneficial effects:

[0023] The preparation method of the surface with the super-low ice adhesion strength provided in the application imitates the super-hydrophobic and low-adhesion characteristics of Trifolium repens, adopts a femtosecond laser processing combined with boiling water treatment mode to prepare a hierarchical micro-nano structure with a controllable morphology on an aluminum alloy sheet, and finally performs fluorination modification to make the surface present super-hydrophobicity. The hierarchical micro-nano structure makes the micro-droplets present a hierarchical condensation phenomenon when condensing, and small droplets continuously converge into larger droplets, ensuring the stability of the Cassie-Baxter state of the surface at low temperature, thereby realizing good ice-repellent effect and achieving super-low ice adhesion strength.

[0024] The application utilizes the principle of cutting-edge bionics, has a simple preparation process, low cost, and a structure that can be accurately controlled, and can simultaneously realize good anti-icing and de-icing effects. In terms of anti-icing, the micro-droplets always maintain the stability of the Cassie-Baxter state before the surface loses super-hydrophobicity, and the air cushion existing in the Cassie-Baxter state reduces the heat transfer between the surface and the micro-droplets, delaying the icing time of the micro-droplets on the surface, and the longest icing delay time can reach 4h; in terms of de-icing, the ice adhesion strength of the surface is at least 1.08kPa, and the super-low ice adhesion strength enables the ice on the surface to slide off and be removed when the surface moves at a certain angle. At the same time, the structure surface can be repeatedly used, and has important application value in the field of anti-icing and de-icing of wind turbine blades and the like.

[0025] Other advantages, objects, and features of the application will be partly embodied in the following description, and partly understood by those skilled in the art through research and practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The biomimetic object picture of the artificial surface with super-low ice adhesion strength of the artificial Trifolium repens surface and the surface microstructure electron microscope graph of the artificial Trifolium repens surface with super-low ice adhesion strength;

[0027] Figure 2 The hydrophobic performance schematic diagram of the biomimetic object of the artificial Trifolium repens surface with super-low ice adhesion strength;

[0028] Figure 3 The three-dimensional topography graph of the artificial Trifolium repens surface with super-low ice adhesion strength;

[0029] Figure 4 The electron microscope graph of the microporous and microlumpy and submicron flaky structure of the artificial Trifolium repens surface with super-low ice adhesion strength;

[0030] Figure 5 The static anti-icing function graph of the artificial Trifolium repens surface with super-low ice adhesion strength, A is the surface of the application, and B is an untreated unstructured aluminum alloy surface;

[0031] Figure 6 The dynamic anti-frosting function graph of the artificial Trifolium repens surface with super-low ice adhesion strength, A is the surface of the application, and B is an untreated unstructured aluminum alloy surface;

[0032] Figure 7 The dynamic deicing function graph of the artificial Trifolium repens surface with super-low ice adhesion strength;

[0033] Figure 8 The electron microscope graph of the aluminum alloy surface provided for Comparative Example 1 of the application;

[0034] Figure 9 The electron microscope graph of the aluminum alloy surface provided for Comparative Example 2 of the application;

[0035] Figure 10 The super-low ice adhesion strength columnar graph of Comparative Examples 1-2 and Example 3. DETAILED DESCRIPTION:

[0036] In order to make the purpose, technical scheme and advantages of the application more clear, the technical scheme of the application will be described clearly and completely below.

[0037] The surface of the Trifolium repens leaf has a micro-nano hierarchical structure (microporous and nanoscale flaky structure) and a low surface energy wax layer (see Figure 1 ), which presents super-hydrophobic low adhesion characteristics similar to lotus leaves (see Figure 2 ), and can safely overwinter under snow cover, with strong cold resistance;

[0038] The present application imitates the surface structure of the leaves of white clover, and adopts femtosecond laser processing combined with boiling water treatment to process a micro-nano hierarchical structure on the surface of an aluminum sheet or an aluminum alloy sheet (see Figure 3 , Figure 4 ), which includes processing uniformly distributed periodic micropores by femtosecond laser processing, and randomly dispersing micro-cluster structures of different sizes on the edges and inner walls of the micropores, and processing closely arranged sub-micron flake structures on the surfaces of the micropores and the micro-cluster structures by boiling water treatment (see Figure 4 ). Then, the surface of the aluminum sheet or the aluminum alloy sheet is modified by fluorination to present super-hydrophobicity and ice-phobicity, and a white clover-imitated surface with super-low ice adhesion strength is obtained.

[0039] In the present application, the aluminum sheet or the aluminum alloy sheet has a thickness of greater than 100 μm; the micropores have the same size, a micropore diameter of 24-30 μm, a micropore depth of 19-37 μm, and a micropore center distance of 26-33 μm; the micro-cluster structures have a diameter of 1-6 μm; the sub-micron flake structures have a width of 100-400 nm; and the surface fluorination modification is performed by using low-surface-energy 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane for modification treatment.

[0040] The specific schemes proposed in the present application are described in more detail below by means of several specific examples.

[0041] Example 1

[0042] The present example provides a surface with super-low ice adhesion strength, which is arranged on an aluminum alloy substrate with a thickness of 150 μm, and has periodic micropores with the same size on the surface of the aluminum alloy, a micropore diameter of 26 μm, a micropore depth of 31 μm, and a micropore center distance of 28 μm; and randomly dispersed micro-cluster structures of different sizes on the edges and inside of the periodic micropores, with a micro-cluster structure diameter ranging from 1 μm to 6 μm; and closely arranged sub-micron nanosheets on the surfaces of the micropores and the micro-cluster structures, with a sub-micron nanosheet structure width of 100-400 nm.

[0043] The preparation method of the above-mentioned surface with super-low ice adhesion strength is as follows:

[0044] 1) Femtosecond laser is used to process periodic micropores with the same size and distance on the surface of the aluminum alloy, to obtain a surface with distributed circular micropores and cluster structures, the laser beam is perpendicular to the surface, and the laser beam is scanned on the surface in a parallel manner; the laser spot diameter is 14 μm, the pulse energy is 50 mW, and the scanning time is 26,000 μs.

[0045] 2) The laser-processed aluminum alloy is immersed in boiling water at 120℃ for 60 min by boiling water treatment, and a dense distribution of sub-micron flake structures is obtained on the surface of the aluminum alloy.

[0046] 3) The surface of the aluminum alloy after boiling water treatment is fluorinated by using low surface energy 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane to modify it into a super-hydrophobic surface.

[0047] Referring to Figure 5 In order to verify the static anti-icing effect of the Trifolium repens surface with ultra-low ice adhesion strength, the sample is fixed on the refrigeration table by adhesive tape, and a drop of 10 μL of ultrapure water is dropped on it. The time for the drop to completely freeze is 244 min from the start of the refrigeration table power supply, while the time for the drop on the unprocessed aluminum alloy surface to completely freeze is 4 min, which is 4 h longer.

[0048] Example 2:

[0049] The Trifolium repens surface with ultra-low ice adhesion strength in this embodiment is arranged on an aluminum alloy substrate with a thickness of 150 μm, and there are periodic micropores with the same size on the surface of the aluminum alloy, the micropore diameter is 26 μm, the micropore depth is 31 μm, and the micropore center distance is 28 μm. There are micro-cluster structures of different sizes randomly dispersed on the edges and inside of the periodic micropores, and the diameter of the micro-cluster structure ranges from 1 to 6 μm. On the surface of the micropores and the micro-cluster structures, there are closely arranged sub-micron nanosheets, and the structure width of the sub-micron nanosheets is 100-400 nm.

[0050] The preparation method of the Trifolium repens surface with ultra-low ice adhesion strength described above is as follows:

[0051] 1) The periodic micropores with the same size and spacing are processed on the surface of the aluminum alloy by femtosecond laser to obtain a surface with circular micropores and cluster structures. The laser beam is perpendicular to the surface, and the laser beam is scanned point by point in parallel on the surface. The spot diameter of the laser is 14 μm, the pulse energy is 50 mW, and the scanning time is 26,000 μs.

[0052] 2) The laser-processed aluminum alloy is immersed in boiling water at 120℃ for 60 min by boiling water treatment, and a dense distribution of sub-micron flake structures is obtained on the surface of the aluminum alloy.

[0053] 3) The surface of the aluminum alloy after boiling water treatment is fluorinated by using low surface energy 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane to modify it into a super-hydrophobic surface.

[0054] Referring to Figure 6In order to verify the dynamic anti-frost effect of the Trifolium repens surface with super-low ice adhesion strength and its application in wind turbines, the sample is pasted on the model blade of the wind turbine, and is placed in the refrigerator with continuous spraying, the temperature in the refrigerator is-18℃, the relative humidity is 90%, the model wind turbine is started, and the blade rotates at a constant speed. After 5h, the sample surface still keeps frost-free state, while the surface without the structure is covered with thick frost.

[0055] Example 3

[0056] The Trifolium repens surface with super-low ice adhesion strength in this example is arranged on an aluminum alloy substrate with a thickness of 150μm, and there are periodic micropores with the same size on the surface of the aluminum alloy, the micropore diameter is 26μm, the micropore depth is 31μm, and the micropore center distance is 28μm; there are micro-cluster structures with different sizes randomly dispersed on the edge and inside of the periodic micropores, and the diameter ranges from 1-6μm; and sub-micron nanosheets are closely arranged on the micropore and micro-cluster surface, and the structure width is 100-400nm.

[0057] The preparation method of the Trifolium repens surface with super-low ice adhesion strength is as follows:

[0058] 1) The femtosecond laser is used to process periodic micropores with a diameter of 26μm, a depth of 31μm, and a micropore center distance of 28μm on the surface of the aluminum alloy, to obtain a surface with distributed circular micropores and cluster structures; the laser beam is perpendicular to the surface, and the laser beam is scanned point by point in parallel on the surface; the spot diameter of the laser is 14μm, the pulse energy is 50mW, and the scanning time is 26000μs.

[0059] 2) The surface after laser processing is immersed in boiling water at 120℃ for 60min by boiling water treatment, to obtain a surface with densely distributed sub-micron sheet structures.

[0060] 3) The surface after boiling water treatment is subjected to surface fluorination treatment with low surface energy 1H,1H,2H,2H-perfluorodecyltriethoxysilane, so as to be modified into a surface with super-hydrophobicity.

[0061] In order to verify the super-low ice adhesion strength of the Trifolium repens surface with super-low ice adhesion strength, a rectangular prism with a cross section of 10mm×10mm is used as a mold, the mold is vertically placed on the sample surface, then 20mm high ultrapure water is added, and the whole is placed in the refrigerator for freezing for 4h. After the ice is completely frozen, a precision of 0.001N is used to push the ice column from the root of the mold at a constant speed, and the force required to push the ice column is measured, so as to obtain the ice adhesion strength as low as 1.08kPa, and the calculation formula is as follows:

[0062] σ=F / S

[0063] wherein σ is the ice adhesion strength per unit area, Pa; F is the measured ice adhesion force, N; S is the contact area of the ice with the substrate, m 2 .

[0064] Example 4:

[0065] A white clover-like surface with ultra-low ice adhesion strength is prepared on an aluminum alloy substrate with a thickness of 150 μm. The aluminum alloy surface has periodic micropores with the same size, a micropore diameter of 26 μm, a micropore depth of 31 μm, and a micropore center distance of 28 μm. The periodic micropore edges and the interior have randomly dispersed micro-cluster structures with different sizes, with a diameter ranging from 1 μm to 6 μm. The micropores and the micro-cluster surfaces are closely arranged with sub-micron nanosheets, with a structure width of 100 nm to 400 nm.

[0066] The preparation method of the above-mentioned white clover-like surface with ultra-low ice adhesion strength is as follows:

[0067] 1) A femtosecond laser is used to process the surface of the aluminum alloy to form periodic micropores with a diameter of 26 μm, a depth of 31 μm, and a micropore center distance of 28 μm, and a cluster structure with a diameter ranging from 1 μm to 6 μm. The laser beam is perpendicular to the surface, and the laser beam is scanned point by point in a parallel manner on the surface. The laser spot diameter is 14 μm, the pulse energy is 50 mW, and the scanning time is 26,000 μs.

[0068] 2) The surface after laser processing is immersed in boiling water at 120°C for 60 min by using a boiling water treatment method to obtain a surface with densely distributed sub-micron sheet structures.

[0069] 3) A low-surface-energy 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane is used for surface fluorination treatment of the surface after boiling water treatment to modify the surface to have superhydrophobicity.

[0070] Referring to Figure 7 In order to verify the dynamic ice-repellent effect of the white clover-like surface with ultra-low ice adhesion strength and its application in a wind turbine, a double-sided adhesive tape is used to paste the sample on the blade of a wind turbine model. A drop of 10 μL of ultrapure water is placed on the sample, and the liquid drop is completely frozen into ice in a refrigerator. Subsequently, the wind turbine model is started, and the blade is rotated at a constant speed. It can be observed that the frozen ice is also removed with the rotation of the blade, which indicates that the white clover-like surface with ultra-low ice adhesion strength has good dynamic ice-repellent effect.

[0071] Through the verification of the above examples 1-4, examples 1-2 can achieve the best anti-icing effect, the static icing prolongs the time up to 4h, and the dynamic frost prevention can be up to 5h; examples 3-4 can achieve the best deicing effect, the ice adhesion strength is the lowest 1.08kPa, and in the moving state, the ice that has been formed can be quickly removed, at the same time, good anti-icing and deicing effect is achieved, which has important application value in the field of anti-icing and deicing.

[0072] In order to better illustrate the beneficial effects that can be achieved by the white clover-like surface with ultra-low ice adhesion strength and the preparation method thereof, the following several comparative examples are used to further analyze the technical solutions of the present application.

[0073] Comparative example 1:

[0074] Based on example 3, the difference is that this comparative example does not use boiling water treatment, see Figure 8 .

[0075] Comparative example 2:

[0076] Based on example 3, the difference is that this comparative example does not use femtosecond laser processing, see Figure 9 .

[0077] See Figure 10 , in order to verify the ultra-low ice adhesion strength of comparative examples 1-2, a rectangular prism with a cross section of 10mmx10mm is used as a mold, the mold is vertically placed on the surface of the sample, then 20mm height of ultrapure water is added, and the whole is put into the refrigerator and frozen for 4h, after the ice is completely frozen, a precision of 0.001N is used to push the ice column from the root of the mold at a uniform speed, and the force used to push the ice column is measured, the calculation formula is as follows:

[0078] σ=F / S

[0079] In the formula, σ is the ice adhesion strength per unit area, Pa; F is the measured ice adhesion force, N; S is the contact area of the ice with the substrate, m 2 ;

[0080] Through the verification of the above Comparative Examples 1-2 and Example 3: the white clover surface with ultra-low ice adhesion strength provided by the present application realizes the imitation of the micro-hole-nanosheet on the white clover surface through femtosecond laser and boiling water treatment, and the ice adhesion strength is far lower than that of Comparative Example 1 and Comparative Example 2, which is reduced by 91.6% compared with Comparative Example 1 and by 62.2% compared with Comparative Example 2, indicating that the present application is not a simple superposition of the effect of the micro-hole and micro-cluster structure of Comparative Example 1 and the effect of the sub-micron sheet structure of Comparative Example 2, and the micro-nano hierarchical structure provided by the present application has a mutual interaction: the micro-nano hierarchical structure makes the micro-droplets present a hierarchical condensation phenomenon when condensing, and the small droplets continuously converge into larger droplets, ensuring the stability of the Cassie-Baxter state of the surface at low temperature, thereby realizing good ice-repellent effect and achieving ultra-low ice adhesion strength.

[0081] Finally, it should be noted that the above-described examples are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit it, and the protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that any person skilled in the art can modify or easily think of changes to the technical solutions recorded in the foregoing examples, or make equivalent replacements to some technical features, within the technical range disclosed by the present application; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application.

Claims

1. A white clover-like surface having ultra-low ice adhesion strength comprising a substrate, characterized in that, The surface of the substrate is micro-nano hierarchical structure imitating the leaf blade of white clover, the surface is provided with uniformly distributed periodic micropores, the edges and inner walls of the micropores are randomly dispersed with micro-cluster structures of different sizes, and the surfaces of the micropores and the micro-cluster structures are closely arranged with sub-micron scale flaky structures; the surface is fluorinated and modified to present super-hydrophobicity and ice-phobicity. The micropores are of the same size, the micropore diameter is 24-30 μm, the micropore depth is 19-37 μm, the micropore center spacing is 26-33 μm, and the diameter of the micro-cluster structure is 1-6 μm; the width of the sub-micron scale flaky structure is 100-400 nm.

2. The Trifolium repens surface with ultra-low ice adhesion strength according to claim 1, characterized in that, The substrate is an aluminum sheet or an aluminum alloy sheet, and the thickness is greater than 100 μm.

3. A process for the preparation of a Trifolium repens surface having ultra-low ice adhesion according to any one of claims 1-2, characterized in that, The steps are as follows: S1, using femtosecond laser to process periodic micropores of the same size and spacing on the surface of the substrate to obtain a surface distributed with circular micropores and cluster structures; the laser beam is perpendicular to the surface, and the laser beam is scanned point by point in parallel on the surface; S2, using boiling water treatment, the surface of the substrate treated in S1 is soaked in boiling water at 120℃ for a certain time to obtain dense distribution of sub-micron scale flaky structures on the surface; S3, surface fluorination treatment is performed on the surface of the substrate treated in S2 to modify the surface to have super-hydrophobicity.

4. The method of producing a pseudo-white clover surface having an ultra-low ice adhesion strength according to claim 3, characterized by, The spot diameter of the laser is 14 μm, the pulse energy is 40-70 mW, and the scanning time is 14000-32000 μs; the boiling water treatment time is 30-120 min.

5. The method of producing a pseudo-creeping bentgrass surface having ultra-low ice adhesion strength according to claim 4, wherein, In S3, the surface fluorination treatment is modified by using low surface energy 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane.

6. An aluminum alloy skin with the surface of white clover imitating surface with super-low ice adhesion strength according to any one of claims 1-2 and its application in wind turbine blade ice prevention and removal.

7. Use of an aluminum alloy skin with a white clover leaf surface having ultra-low ice adhesion strength according to claim 6 in wind turbine blade de-icing and anti-icing, characterized in that, The aluminum alloy skin is arranged on the surface of the wind turbine blade.

8. Use of an aluminum alloy skin with a white clover leaf surface having ultra-low ice adhesion strength according to claim 7 in wind turbine blade de-icing and anti-icing, characterized in that, The aluminum alloy skin with the surface of white clover imitating surface with super-low ice adhesion strength is pasted on the wind turbine model blade, the wind turbine model is placed in a refrigerator with continuous spraying to simulate a low-temperature and high-humidity environment, the wind turbine model is started to rotate at a constant speed, and the ice prevention and frost prevention effect is observed; wherein the simulated environment temperature is -15℃-20℃, and the relative humidity is 80%-90%.

9. Use of the aluminum alloy skin with a white clover surface having ultra-low ice adhesion strength according to claim 7 in wind turbine blade de-icing and anti-icing, characterized in that, The aluminum alloy skin with the surface of white clover imitating surface with super-low ice adhesion strength is pasted on the wind turbine model blade, a drop of 10 μL of ultrapure water is dropped on the aluminum alloy surface, and the liquid drop is completely frozen into ice in the refrigerator, then the wind turbine model is started to rotate at a constant speed, and the ice-phobicity and ice removal effect is observed.

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