Super-hydrophobic coating reinforced by constructing a bird's nest-like skeleton structure and preparation method thereof

Abstract

The present invention relates to a super-hydrophobic coating and a preparation method thereof for strengthening a skeleton structure for constructing a bird's nest, and belongs to the technical field of super-hydrophobic coatings. The super-hydrophobic coating is a composite coating composed of a bird's nest skeleton structure formed by spontaneous stacking of SiC whiskers on a substrate surface and hydrophobic nanoparticles filled in the gap of the bird's nest skeleton structure, and the mechanical stability of the bird's nest skeleton structure is utilized to protect the hydrophobic nanoparticles filled in it, so as to effectively improve the mechanical stability of the super-hydrophobic coating; In addition, the bird's nest skeleton structure is prepared by spraying, and the filling of hydrophobic nanoparticles is achieved by dipping or vacuum infusion, and the preparation process is simple, easy to operate, and can be prepared on a large scale, with low preparation cost, and the raw materials used for preparation are non-toxic, harmless, and environmentally friendly, which is conducive to promoting the industrial development of super-hydrophobic coatings.

Description

Technical Field

[0001] The invention relates to a super-hydrophobic coating strengthened by constructing a bird's nest-like skeleton structure and a preparation method thereof, belonging to the technical field of super-hydrophobic coatings. Background Art

[0002] In the past few decades, superhydrophobic surfaces inspired by lotus leaves have received widespread attention and rapid development due to their multiple functional characteristics such as self-cleaning, low solid-liquid adhesion, and staying dry. They have also developed many applications such as self-cleaning, anti-fouling, anti-fog, anti-icing, drag reduction, and water collection.

[0003] However, the practical application of super-hydrophobic surfaces obtained based on current preparation methods in the industrial field is still unsatisfactory. This is mainly because in addition to having excellent liquid-repelling properties, super-hydrophobic surfaces must also have good mechanical stability, chemical stability, thermal stability and other properties. However, according to the theoretical common sense of achieving super-hydrophobic surfaces, to achieve super-hydrophobicity, it is necessary to have a microscopic or even nanoscale surface morphology, so that a large degree of air entrapment can be generated when in contact with water. However, this will result in a very high surface roughness, that is, only a very small part of the entire surface is in contact with water. Therefore, even if a very small mechanical load is applied to the super-hydrophobic surface, defects will eventually occur on the super-hydrophobic surface.

[0004] In response to the above-mentioned contradiction, many scholars at home and abroad have done a lot of work to improve the mechanical durability of superhydrophobic surfaces. For example, by introducing an adhesive layer between the superhydrophobic coating and the substrate to enhance, prepare self-healing or easy-to-repair superhydrophobic coatings, and randomly introduce discrete microstructures on the superhydrophobic surface to withstand wear forces. However, these methods either use organic solvents or fluorine-containing materials to cause additional environmental pollution, or only moderately increase the mechanical durability of the material surface. Recently, Deng Xu's research group proposed the concept of an armored surface, that is, to prepare a superhydrophobic coating on the surface of the material through precision machining or photolithography, which greatly increases the mechanical durability of the superhydrophobic surface. However, the formation of this microstructure armor requires sophisticated and expensive instruments such as exposure machines, plasma cleaning machines, and super-secret machine tools, which greatly increases the process complexity and manufacturing costs. Summary of the Invention

[0005] In response to the contradiction between super-hydrophobic performance and mechanical stability of current super-hydrophobic coatings, the present invention provides a super-hydrophobic coating strengthened by constructing a bird's nest-like skeleton structure and a preparation method thereof. Hydrophobic nanoparticles are filled in the gaps of the bird's nest-like skeleton structure formed by spontaneous stacking of SiC whiskers, and the mechanical stability of the skeleton is utilized to protect the hydrophobic nanoparticles, thereby effectively improving the mechanical stability of the super-hydrophobic coating. In addition, the bird's nest-like skeleton structure is prepared by spraying, and the filling of the hydrophobic nanoparticles is achieved by dipping or vacuum infusion. The preparation process is simple, easy to operate, can be prepared on a large scale, has low preparation cost, and the raw materials used in the preparation are non-toxic, harmless, and environmentally friendly, which is conducive to promoting the industrial development of super-hydrophobic coatings.

[0006] The objectives of the present invention are achieved through the following technical solutions.

[0007] A super-hydrophobic coating reinforced by constructing a bird's nest-like skeleton structure is a composite coating composed of a bird's nest-like skeleton structure formed by spontaneous stacking of SiC whiskers on the substrate surface and hydrophobic nanoparticles filling the gaps in the bird's nest-like skeleton structure;

[0008] The bird's nest skeleton structure is specifically formed by reacting a mixed system consisting of SiC whiskers, dispersant PVA (polyvinyl alcohol), pH regulator ammonia water, water-based polyurethane, silica sol, silane coupling agent KH560 (γ-glycidyloxypropyltrimethoxysilane), defoaming agent and water on the surface of the substrate; wherein the mass ratio of SiC whiskers to PVA is 1:0.01 to 1:0.1, ammonia water is used to adjust the pH value of the mixed system to between 9 and 10, and the water-based polyurethane The mass ratio of polyurethane in urethane, silica in silica sol and KH560 is 6:(3-6):1, the mass ratio of the sum of the mass of polyurethane in waterborne polyurethane, silica in silica sol and KH560 to SiC whiskers is 0.2:1-0.45:1, the mass ratio of defoamer to SiC whiskers is 1:1000-5:1000, the mass ratio of SiC whiskers to water is 1:1.2-1:2.5, and the defoamer is an organosilicon defoamer.

[0009] The particle size of the hydrophobic nanoparticles is 2 to 16 nm.

[0010] Furthermore, the length of the SiC whisker is 50-150 μm, and the diameter is 0.1-0.6 μm.

[0011] Furthermore, the weight average molecular weight of PVA is 15,000 to 30,000.

[0012] Furthermore, a substrate with a wetting angle (or contact angle) CA ≤ 40° is selected.

[0013] Furthermore, the thickness of the super hydrophobic coating is 20 to 100 μm.

[0014] A method for preparing a super-hydrophobic coating reinforced by constructing a bird's nest-like skeleton structure specifically comprises the following steps:

[0015] (1) mixing SiC whiskers, PVA, ammonia, defoamer and water to obtain a suspension; mixing waterborne polyurethane, silica sol and KH560 to obtain a composite adhesive;

[0016] (2) uniformly mixing the suspension and the composite binder to obtain a mixed system;

[0017] (3) The mixed system is sprayed on the substrate surface by air spraying, and then allowed to stand in the air for 4 to 6 hours to solidify, and then dried. The mixed system spontaneously reacts and stacks on the substrate surface to form a bird's nest-like skeleton structure;

[0018] (4) Dipping the bird's nest-like skeleton structure on the surface of the substrate into a solution of hydrophobic nanoparticles or infusing the solution of hydrophobic nanoparticles into the gaps of the bird's nest-like skeleton structure on the surface of the substrate by vacuum infusion, and then drying to remove the solvent in the solution of hydrophobic nanoparticles to form the superhydrophobic coating on the surface of the substrate.

[0019] Furthermore, in step (1), an ultrasonic cell disruptor is used for dispersion mixing to obtain a uniformly mixed suspension, wherein the ultrasonic power is 150 to 200 W and the ultrasonic dispersion time is 15 to 25 minutes; and a magnetic stirring method is used for mixing to obtain a uniformly mixed composite adhesive, wherein the stirring rate is 500 to 800 rpm and the stirring time is 120 to 180 minutes.

[0020] Furthermore, in step (2), magnetic stirring is used to mix to obtain a uniformly mixed system, wherein the stirring rate is 600-800 rpm and the stirring time is 60-90 min.

[0021] Furthermore, in step (3), the spraying pressure of the air spraying is 0.2-0.3 MPa, and the spraying distance is 20-40 cm.

[0022] Furthermore, in step (4), the mass fraction of the hydrophobic nanoparticles in the solution of hydrophobic nanoparticles is 0.5-2.0%; the solvent in the solution of hydrophobic nanoparticles is preferably ethanol; and the hydrophobic nanoparticles are preferably dispersed in the solvent using an ultrasonic cell disruptor to form a solution of hydrophobic nanoparticles, wherein the ultrasonic power is 300-500 W and the ultrasonic dispersion time is 20-40 min.

[0023] Furthermore, in step (4), when the bird's nest-shaped skeleton structure on the surface of the substrate is dipped in a solution of hydrophobic nanoparticles, the thickness of the prepared superhydrophobic coating is 20 to 50 μm; when the solution of hydrophobic nanoparticles is infused into the gaps in the bird's nest-shaped skeleton structure on the surface of the substrate by vacuum infusion, the thickness of the prepared superhydrophobic coating is 20 to 100 μm.

[0024] Beneficial effects:

[0025] (1) The bird's nest in nature is a classic example of disordered blocking filling of rod-shaped particles. The contact friction and mutual coupling entanglement between the rods of the bird's nest structure make it elastic and self-supporting. The SiC whisker used in the present invention is a rod-shaped particle, which is used to form a bird's nest-like structure by spontaneous stacking. Then, hydrophobic nanoparticles are poured into the bird's nest-like structure, and the self-mechanical stability of the bird's nest-like structure is used to protect the hydrophobic nanoparticles so as to improve the mechanical durability of the super-hydrophobic coating. In addition, the selected SiC whisker has excellent properties such as high strength, high hardness, high elastic modulus, wear resistance, corrosion resistance, etc., and can further improve the mechanical properties of the super-hydrophobic coating.

[0026] (2) The bird's nest skeleton structure in the super-hydrophobic coating of the present invention is formed by the combined action of ammonia, PVA and a composite binder. Among them, the main function of ammonia is to adjust the Zeta potential of SiC whiskers in water, because SiC whiskers are easy to disperse under alkaline conditions, so that single SiC whiskers are randomly dispersed and arranged; PVA plays a role similar to "bundling" on single SiC whiskers, "packing" single SiC whiskers into small bundles, so that random stacking during the spraying process forms a bird's nest structure, but when the mass ratio of PVA to SiC whiskers is high, too much PVA will block the holes between the whisker bundles and it is not easy to form a bird's nest structure; the addition of the binder is mainly to enhance the bonding force between the coating and the substrate and the whiskers, thereby increasing the mechanical stability of the bird's nest structure. Similar to PVA, too much binder will also block the holes between the whisker bundles, but too little binder cannot provide an ideal bonding effect. In addition, since the water resistance of single water-based polyurethane is poor, and the water-based polyurethane and silica sol can improve the water resistance of the water-based polyurethane when compounded with KH560, the present invention adopts a composite binder.

[0027] (3) The SiC whiskers used in the present invention require a large aspect ratio. A large aspect ratio creates a relatively large bird's nest pore. However, an excessively large aspect ratio is not conducive to dispersion. Meanwhile, smaller nanoparticles are more easily infused into the gaps in the bird's nest structure.

[0028] (4) The present invention adopts a spraying method to prepare a bird's nest-like skeleton structure, and adopts a dipping or vacuum infusion method to realize the filling of hydrophobic nanoparticles. The preparation process is simple and easy to operate, can be prepared on a large scale, and has a low preparation cost. Moreover, the raw materials used in the preparation are non-toxic, harmless, and environmentally friendly, which is conducive to promoting the industrial development of super-hydrophobic coatings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a scanning electron microscope (SEM) image of the bird's nest-like skeleton structure prepared in step (3) of Example 1.

[0030] Figure 2 This is a surface scanning electron microscope image of the super-hydrophobic coating prepared in step (4) of Example 1.

[0031] Figure 3 This is a cross-sectional scanning electron microscope image of the super-hydrophobic coating prepared in step (4) of Example 1.

[0032] Figure 4 This is a graph showing the test results of the surface contact angle and sliding angle of the super-hydrophobic coating prepared in step (4) of Example 1. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to specific embodiments, wherein the methods are conventional methods unless otherwise specified, and the raw materials can be obtained from public commercial channels unless otherwise specified.

[0034] In the following embodiments:

[0035] SEM characterization: The microstructure of the test samples was characterized using a Japan Advanced Technologies Corporation S-4800 cold field emission scanning electron microscope;

[0036] SiC whiskers: 0.6 μm in diameter, 50-100 μm in length, 99% line formation rate;

[0037] Silica sol: pH = 4-8, 30 wt% solid content, Beijing Huawei Ruike Chemical Co., Ltd.

[0038] Waterborne polyurethane: 60 wt% solid content, Shanghai MacLean Biochemical Technology Co., Ltd.

[0039] PVA: Mw≈205000;

[0040] Ammonia water: mass fraction 25-28%, Sinopharm Holding Chemical Reagent Co., Ltd.;

[0041] Hydrophobic silica nanoparticles: 16 nm in diameter, 99.8% purity, AEROSIL R972;

[0042] Defoaming agent: AFE-3168, Dow Corning;

[0043] Ultrasonic cell disruptor: SCIENTZ-IID, Ningbo Xinzhi Biotechnology Co., Ltd.;

[0044] Air spray gun: W71C, ANEST IWATA Corporation, Japan.

[0045] Characterization of super-hydrophobic coatings: (1) The contact angle and sliding angle of the prepared coatings were measured using a contact angle meter; (2) The super-hydrophobic coatings were subjected to a standard abrasion test according to ASTM D4060 using a Taber abrasion tester, in which the Taber abrasion tester is used to measure the wear of the coating by two freely rotating grinding wheels ( CS-10, INDUSTRIES), a sample fixed on a rotating platform is worn under a certain load of 500g. The rotating platform rotates at a constant speed of 60rpm. One rotation of the sample is considered as one cycle. After a certain number of wears, its static contact angle and rolling angle are measured.

[0046] Example 1

[0047] (1) 8 g SiC whiskers, 4 g PVA (10% by mass), 8 mL ammonia, 0.02 g defoamer and 20 mL water were mixed and dispersed using an ultrasonic cell crusher with an ultrasonic power of 200 W and an ultrasonic time of 20 min to obtain a suspension.

[0048] 10 g of waterborne polyurethane, 20 g of silica sol and 1 g of KH560 were mixed and stirred at a stirring rate of 800 rpm for 120 min to obtain a composite adhesive;

[0049] (2) 4 g of the composite binder was added to 40 g of the suspension and stirred at 800 rpm for 60 min to obtain a mixed system with a pH of 10;

[0050] (3) The mixed system was sprayed on the surface of the glass substrate by air spraying, wherein the spraying pressure was 0.3 MPa and the spraying distance was 30 cm. After the spraying, it was first allowed to stand in the air for 24 hours to solidify, and then placed in a 120°C oven for 5 hours to dry. The mixed system spontaneously reacted and stacked on the surface of the glass substrate to form a bird's nest-like skeleton structure;

[0051] (4) 8 g of hydrophobic silicon oxide nanoparticles are added to 400 g of ethanol and dispersed by an ultrasonic cell crusher, wherein the ultrasonic power is 500 W and the ultrasonic time is 20 min to obtain a solution of hydrophobic nanoparticles; the solution of hydrophobic nanoparticles is drop-coated on the surface of the bird's nest-like skeleton structure on the surface of the glass substrate, and then placed in a 100°C oven to dry the ethanol, and then the solution of hydrophobic nanoparticles is drop-coated on the surface of the bird's nest-like skeleton structure on the surface of the glass substrate and the ethanol is dried, and this is repeated until the bird's nest-like skeleton structure on the surface of the glass substrate is covered with hydrophobic silicon oxide nanoparticles, and the excess nanoparticles on the surface are gently wiped off with dust-free paper, thereby forming a super-hydrophobic coating on the surface of the substrate strengthened by constructing a skeleton structure that imitates a bird's nest.

[0052] Figure 1 The SEM test results show that SiC whiskers are stacked on the surface of the glass substrate to form a bird's nest-like skeleton structure, and it can be seen that the whiskers are evenly dispersed without obvious agglomeration. Figure 2 The surface SEM test results show that the surface of the bird's nest skeleton structure is completely covered by hydrophobic silica nanoparticles; Figure 3 The cross-sectional SEM test results show that the infusion depth of hydrophobic silica nanoparticles reaches nearly 40μm.

[0053] The test shows that the contact angle of the prepared super-hydrophobic coating is about 160° and the rolling angle is about 3°. Figure 4 In addition, the super-hydrophobic coating still maintains its super-hydrophobic properties after 70 cycles as measured by a Taber abrasion tester. Compared with the hydrophobic silica nanoparticles alone (5 cycles), the wear resistance is significantly improved.

[0054] Example 2

[0055] Steps (1) to (3) are the same as steps (1) to (3) in Example 1;

[0056] (4) 8 g of hydrophobic silicon oxide nanoparticles are added to 400 g of ethanol and dispersed by an ultrasonic cell crusher, wherein the ultrasonic power is 500 W and the ultrasonic time is 20 min to obtain a solution of hydrophobic nanoparticles; the bird's nest-like skeleton structure on the surface of the glass substrate is immersed in an evaporating dish containing the solution of hydrophobic nanoparticles, and the evaporating dish is connected to a vacuum pump, and the hydrophobic silicon oxide nanoparticles are poured into the gaps of the bird's nest-like skeleton structure by vacuum infusion, and then placed in a 100 ° C oven to dry the ethanol, and then the hydrophobic nanoparticle solution is dripped on the surface of the bird's nest-like skeleton structure on the surface of the glass substrate and the ethanol is dried, and the excess nanoparticles on the surface are gently wiped off with dust-free paper, thereby forming a super-hydrophobic coating on the surface of the substrate strengthened by constructing a skeleton structure that imitates a bird's nest.

[0057] According to the SEM test results, the surface of the bird's nest-like skeleton structure is completely covered with hydrophobic silica nanoparticles, and the infusion depth of the hydrophobic silica nanoparticles reaches 80μm.

[0058] Tests show that the prepared super-hydrophobic coating has a contact angle of approximately 162° and a rolling angle of approximately 3°. Furthermore, a Taber abrasion tester showed that the super-hydrophobic coating maintained its super-hydrophobic properties after 200 cycles, significantly improving its wear resistance compared to hydrophobic silica nanoparticles alone (5 cycles).

[0059] Example 3

[0060] Step (1) is the same as step (1) in Example 1

[0061] (2) 2 g of the composite binder was added to 40 g of the suspension and stirred at 800 rpm for 60 min to obtain a mixed system with a pH of 10;

[0062] Steps (3) to (4) are the same as steps (3) to (4) in Example 1, and accordingly a super-hydrophobic coating is formed on the surface of the substrate which is reinforced by constructing a bird's nest-like skeleton structure.

[0063] According to the SEM test results, the surface of the bird's nest-like skeleton structure is completely covered with hydrophobic silica nanoparticles, and the infusion depth of the hydrophobic silica nanoparticles reaches 60μm.

[0064] Tests show that the prepared super-hydrophobic coating has a contact angle of approximately 161° and a rolling angle of approximately 4°. Furthermore, a Taber abrasion tester showed that the super-hydrophobic coating maintained its super-hydrophobic properties after 80 cycles, significantly improving its wear resistance compared to hydrophobic silica nanoparticles alone (5 cycles).

[0065] Comparative Example 1

[0066] A solution of hydrophobic nanoparticles prepared in step (4) of Example 1 was sprayed on a glass substrate, wherein the spraying pressure was 0.3 MPa and the spraying distance was 30 cm. After the spraying was completed, the ethanol was dried in an oven at 100° C. to form a silicon oxide super-hydrophobic coating on the surface of the substrate that was not reinforced by constructing a bird's nest-like skeleton structure.

[0067] Tests show that the prepared silicon oxide super-hydrophobic coating has a contact angle of approximately 165° and a rolling angle of approximately 2°. Furthermore, after five cycles of wear, the silicon oxide nanoparticles were completely worn away, resulting in the coating failing, as measured by a Taber abrader.

[0068] Comparative Example 2

[0069] Step (1) is the same as step (1) in Example 1

[0070] (2) 6 g of the composite binder was added to 40 g of the suspension and stirred at 800 rpm for 60 min to obtain a mixed system with a pH of 10;

[0071] Steps (3) to (4) are the same as steps (3) to (4) in Example 1, and a super-hydrophobic coating is formed on the surface of the substrate accordingly.

[0072] According to the SEM test results, at this time only the surface of the bird's nest-like skeleton structure is covered by hydrophobic silica nanoparticles, and the infusion depth of the hydrophobic silica nanoparticles only reaches 20μm.

[0073] The test results show that the contact angle of the prepared super-hydrophobic coating is about 163 degrees and the rolling angle is about 5 degrees. In addition, the super-hydrophobic coating loses its super-hydrophobicity after 30 cycles of testing using a Taber abrasion tester.

[0074] Comparative Example 3

[0075] Except that the SiC whiskers with a diameter of 0.6 μm and a length of 50 to 100 μm in step (1) of Example 1 are replaced with SiC whiskers with a diameter of 0.6 μm and a length of 10 to 50 μm, the other steps and conditions are the same as those in Example 1, and a superhydrophobic coating is formed on the surface of the substrate accordingly.

[0076] According to the SEM test results, the SiC whiskers were not stacked to form a bird's nest-like skeleton structure, and only the surface was covered with hydrophobic silicon oxide nanoparticles, and the injection depth of the hydrophobic silicon oxide nanoparticles was only 15 μm.

[0077] The test results show that the contact angle of the prepared super-hydrophobic coating is about 165 degrees and the rolling angle is about 5 degrees. In addition, the super-hydrophobic coating loses its super-hydrophobicity after 20 cycles of testing using a Taber abrasion tester.

[0078] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A super-hydrophobic coating reinforced by constructing a bird's nest-like skeleton structure, characterized in that: It is a composite coating composed of a bird's nest skeleton structure formed by spontaneous stacking of SiC whiskers on the substrate surface and hydrophobic nanoparticles filling the gaps in the bird's nest skeleton structure. The bird's nest-like skeleton structure is specifically formed by reacting a mixed system consisting of SiC whiskers, PVA, ammonia water, water-based polyurethane, silica sol, silane coupling agent KH560, silicone defoamer and water on the surface of the substrate; wherein the mass ratio of SiC whiskers to PVA is 1:0.01-1:0.1, the ammonia water is used to adjust the pH value of the mixed system to between 9 and 10, the mass ratio of polyurethane in the water-based polyurethane, silica in the silica sol and KH560 is 6:(3-6):1, the mass ratio of the sum of the mass of polyurethane in the water-based polyurethane, silica in the silica sol and KH560 to SiC whiskers is 0.2:1-0.45:1, the mass ratio of silicone defoamer to SiC whiskers is 1:1000-5:1000, and the mass ratio of SiC whiskers to water is 1:1.2-1:2.5; The length of the SiC whiskers is 50-150 μm and the diameter is 0.1-0.6 μm; The particle size of the hydrophobic nanoparticles is 2-16 nm.

2. The super-hydrophobic coating reinforced by constructing a bird's nest-like skeleton structure according to claim 1, characterized in that: The weight average molecular weight of PVA is 15,000~30,000.

3. The super-hydrophobic coating reinforced by constructing a bird's nest-like skeleton structure according to claim 1, characterized in that: The thickness of the super hydrophobic coating is 20-100 μm.

4. A method for preparing a super-hydrophobic coating reinforced by constructing a bird's nest-like skeleton structure as claimed in any one of claims 1 to 3, characterized in that: The specific steps include: (1) Mix SiC whiskers, PVA, ammonia water, silicone defoamer and water to obtain a suspension; Mix waterborne polyurethane, silica sol and KH560 evenly to obtain a composite adhesive; (2) uniformly mixing the suspension and the composite binder to obtain a mixed system; (3) The mixed system is sprayed on the substrate surface by air spraying, and then allowed to stand in the air for 4 to 6 hours to solidify, and then dried. The mixed system spontaneously reacts and stacks on the substrate surface to form a bird's nest-like skeleton structure; (4) Dipping the bird's nest-like skeleton structure on the surface of the substrate into a solution of hydrophobic nanoparticles or infusing the solution of hydrophobic nanoparticles into the gaps of the bird's nest-like skeleton structure on the surface of the substrate by vacuum infusion, and then drying to remove the solvent in the solution of hydrophobic nanoparticles to form the super hydrophobic coating on the surface of the substrate.

5. The method for preparing a super-hydrophobic coating strengthened by constructing a bird's nest-like skeleton structure according to claim 4, wherein: In step (1), an ultrasonic cell disruptor is used for dispersion and mixing to obtain a uniformly mixed suspension, wherein the ultrasonic power is 150-200 W and the ultrasonic dispersion time is 15-25 min; In step (1), magnetic stirring is used to mix to obtain a uniformly mixed composite adhesive, wherein the stirring rate is 500-800 rpm and the stirring time is 120-180 min; In step (2), magnetic stirring is used to mix to obtain a uniformly mixed system, wherein the stirring rate is 600-800 rpm and the stirring time is 60-90 min; In step (4), an ultrasonic cell disruptor is used to disperse the hydrophobic nanoparticles into a solvent to form a solution of hydrophobic nanoparticles, wherein the ultrasonic power is 300-500 W and the ultrasonic dispersion time is 20-40 min.

6. The method for preparing a super-hydrophobic coating strengthened by constructing a bird's nest-like skeleton structure according to claim 4, wherein: The spraying pressure of the air spray in step (3) is 0.2~0.3 MPa, and the spraying distance is 20~40 cm.

7. The method for preparing a super-hydrophobic coating reinforced by constructing a bird's nest-like skeleton structure according to claim 4, characterized in that: In step (4), the mass fraction of the hydrophobic nanoparticles in the solution of the hydrophobic nanoparticles is 0.5-2.0%.

8. The method for preparing a super-hydrophobic coating strengthened by constructing a bird's nest-like skeleton structure according to claim 4, wherein: In step (4), when the bird's nest-shaped skeleton structure on the surface of the substrate is dipped in a solution of hydrophobic nanoparticles, the thickness of the prepared superhydrophobic coating is 20~50 μm; when the solution of hydrophobic nanoparticles is infused into the gaps in the bird's nest-shaped skeleton structure on the surface of the substrate by vacuum infusion, the thickness of the prepared superhydrophobic coating is 20~100 μm.

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