A diamond-UIO-66-(OH)2-epoxy resin composite super-hydrophobic coating layer and a preparation method and application thereof

Abstract

The application belongs to the field of super-hydrophobic materials, and discloses a diamond-UIO-66-(OH)2-epoxy resin composite super-hydrophobic coating as well as a preparation method and application thereof, which comprises the following steps: (1) adding epoxy resin and polyamide curing agent into an organic solvent for ultrasonic dispersion until the solution is clear and transparent to obtain an epoxy resin solution; the epoxy resin solution is pre-cured by spraying on a substrate surface to obtain an epoxy resin coating; (2) adding diamond and UIO-66-(OH)2 into an organic solvent for ultrasonic dispersion to obtain a diamond-UIO-66-(OH)2 suspension; (3) spraying the suspension on the epoxy resin coating and drying to obtain the super-hydrophobic coating. The coating has excellent super-hydrophobic performance and self-cleaning performance, the contact angle of water on the surface is as high as 154°, and the rolling angle is as low as 6.5°, so that the coating can be used in the fields of self-cleaning, oil-water separation, drag reduction, corrosion prevention and anti-icing, and has wide applicability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of super-hydrophobicity, and particularly relates to a diamond-UIO-66-(OH)2-epoxy resin composite super-hydrophobic coating and a preparation method and application thereof. BACKGROUND

[0002] Generally, a material surface is considered to be super-hydrophobic if it shows a static contact angle (CA) greater than 150° and a low sliding angle (SA) usually less than 10°. Due to the excellent self-cleaning and anti-adhesion properties of super-hydrophobic surfaces, they have wide applications in oil-water separation, drag reduction, anti-icing and other fields.

[0003] Currently, there are two main methods to construct super-hydrophobic surfaces: (1) modifying a low surface energy material on a surface with micro-nano rough structure; and (2) constructing a micro-nano rough structure on a surface of a material with low surface energy. At present, researchers construct a micro-nano composite rough structure surface and use a fluorine-containing low surface energy material to achieve super-hydrophobicity (CN111825807A, CN107964736A). The above method and most of the existing preparation methods use toxic fluorine-containing substances, which have certain impact on the environment. In addition, epoxy resin has excellent mechanical and corrosion resistance properties. However, the existing super-hydrophobic coatings easily lose super-hydrophobicity under certain friction, and have insufficient mechanical stability and chemical stability. Therefore, it is necessary to develop a fluorine-free, simple process, environmentally friendly and wear-resistant epoxy resin composite super-hydrophobic coating. SUMMARY

[0004] In view of the above problems, the present application aims to provide a diamond-UIO-66-(OH)2-epoxy resin composite super-hydrophobic coating and a preparation method and application thereof. The preparation process uses a mixed solvent system of a certain volume ratio of n-hexane and ethanol, and the coating is composed of diamond-UIO-66-(OH)2 particles with high roughness and epoxy resin, and has super-hydrophobicity. At the same time, because the coating is composed of diamond with high roughness and hardness and UIO-66-(OH)2 with high chemical stability, and no fluorine-containing low surface energy material is used in the process of constructing super-hydrophobicity. Therefore, the coating is an environmentally friendly super-hydrophobic coating with excellent wear resistance and corrosion resistance. The diamond-UIO-66-(OH)2-epoxy resin composite coating of the present application can also be combined with various low surface energy materials to construct a super-hydrophobic surface, thereby optimizing the hydrophobicity, and can also be used on different substrate surfaces. In addition, the coating preparation process is simple, and the raw materials are easy to obtain.

[0005] The object of the present application is achieved by the following technical solutions:

[0006] A method for preparing a diamond-UIO-66-(OH)2-epoxy resin composite super-hydrophobic coating, comprising the following steps:

[0007] (1) ultrasonic dispersion of epoxy resin and polyamide curing agent in an organic solvent until the solution is clear and transparent, to obtain an epoxy resin solution; pre-curing of the epoxy resin solution by spraying on the surface of a substrate to obtain an epoxy resin coating;

[0008] (2) adding diamond and UIO-66-(OH)2 to an organic solvent and ultrasonic dispersion to obtain a diamond-UIO-66-(OH)2 suspension;

[0009] (3) spraying the diamond-UIO-66-(OH)2 suspension of step (2) onto the epoxy resin coating of step (1) and drying to obtain a diamond-UIO-66-(OH)2-epoxy resin composite super-hydrophobic coating.

[0010] Preferably, the concentration of epoxy resin in the epoxy resin solution of step (1) is 25-40 g / L, and the concentration of polyamide curing agent is 15-25 g / L.

[0011] Preferably, the mass-volume ratio of diamond to organic solvent in step (2) is 0.002-0.02 g / ml; and the mass-volume ratio of UIO-66-(OH)2 to organic solvent is 0.002-0.02 g / ml.

[0012] Preferably, the organic solvent in steps (1) and (2) is a mixed solution of n-hexane and ethanol in a volume ratio of 1:(0.5-2.0).

[0013] Preferably, the epoxy resin coating of step (1) is pre-cured at room temperature for 1-5 h or in a drying oven at 80°C for 5-20 min; the ultrasonic dispersion time of step (1) is 10-30 min; and the ultrasonic dispersion time of step (2) is 10-30 min.

[0014] Preferably, the UIO-66-(OH)2 of step (2) is synthesized by hydrothermal reaction of ZrCl4, 2,5-dihydroxyterephthalic acid, N,N-dimethylammonium formate, glacial acetic acid and water in a hydrothermal kettle at 120±20°C for 24±12 h.

[0015] Preferably, the drying temperature of step (3) is 80-120°C, and the drying time is 10-30 min.

[0016] Preferably, the substrate in step (1) is uniformly polished 20-30 times by 800±100 mesh sandpaper, and then is washed by ethanol and water circulation ultrasonic washing; the substrate is a metal material, one of inorganic materials, wherein the metal material includes zinc, aluminum, copper, iron, stainless steel mesh, aluminum foil, and the inorganic material includes a glass slide.

[0017] The coating can be applied in the fields of hydrophobicity and wear-resistant corrosion resistance, such as self-cleaning, oil-water separation, drag reduction, corrosion resistance, anti-icing, etc. For example, the diamond-UIO-66-(OH)2-epoxy resin composite coating can be applied to building materials to effectively prevent water penetration and reduce the corrosion of the structure; the diamond-UIO-66-(OH)2-epoxy resin composite coating can be applied to stainless steel mesh or filter mesh for separating oil-water mixture; the diamond-UIO-66-(OH)2-epoxy resin composite material can be attached to the surface of an airplane, submarine or ship to effectively reduce the resistance in forward motion; and the diamond-UIO-66-(OH)2-epoxy resin composite material can be attached to the surface of a cable to improve the ice resistance of the cable.

[0018] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0019] (1) The coating preparation process of the present application is simple, the reaction conditions are mild, and the raw materials are easy to obtain; and in the process of realizing superhydrophobicity, no fluorine-containing low-surface-energy substance is used, which saves cost and reduces the risk of environmental pollution; the superhydrophobicity can be realized by directly spraying the diamond-UIO-66-(OH)2 suspension on the pre-cured epoxy resin coating. Meanwhile, the preparation process uses an alkanol solvent system, which is suitable for the surfaces of various different substrates and has wide applicability.

[0020] (2) The superhydrophobic coating has excellent superhydrophobicity, the contact angle with water can reach 154°, and the rolling angle is as low as 6.5°; and the coating has good self-cleaning effect and excellent thermal stability.

[0021] (3) The coating is prepared from diamond-UIO-66-(OH)2 particles with a composite structure, uses UIO-66-(OH)2 with excellent chemical and thermal stability, combines with superhard diamond components to form a superhydrophobic micro-nano structure, and introduces the roughness of diamond. Therefore, the coating has the advantages of wide applicability, good wear-resistant corrosion resistance and long service life.

[0022] (4) The superhydrophobic coating has certain improvement in wear resistance and hydrophobicity after heating at 330℃ for 2 minutes, and the carbide generated after the combustion of the epoxy resin endows the coating with better wear resistance and superhydrophobicity, i.e., the coating has both superhydrophobicity and wear-resistant corrosion resistance, and can well protect the surface of the coating from corrosion within a certain temperature range. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Scanning electron microscope image of zinc sheet modified with superhydrophobic diamond-UIO-66-(OH)2-epoxy resin composite coating prepared in Example 1, with the contact angle value of water droplet on its surface and the image in the upper right corner of the figure.

[0024] Figure 2 Self-cleaning effect image of zinc sheet modified with superhydrophobic diamond-UIO-66-(OH)2-epoxy resin composite coating prepared in Example 1, with the left and right pictures being the photos before and after water droplet, respectively, in which the original zinc sheet is placed on the upper side of each picture and the superhydrophobic zinc sheet is placed on the lower side.

[0025] Figure 3 Superhydrophobic effect image of zinc sheet modified with superhydrophobic diamond-UIO-66-(OH)2-epoxy resin composite coating prepared in Example 1 immersed in n-octane; the left and right images are the superhydrophobic effect images of the horizontal and inclined surfaces in n-octane, respectively.

[0026] Figure 4 Self-cleaning effect image of zinc sheet modified with superhydrophobic diamond-UIO-66-(OH)2-epoxy resin composite coating prepared in Example 1 after being contaminated by n-octane immersion, with the left and right pictures being the photos before and after water droplet, respectively.

[0027] Figure 5 The left image is the optical image of water droplet on zinc sheet modified with superhydrophobic diamond-UIO-66-(OH)2-epoxy resin composite coating prepared in Example 1, and the right image is the optical image of water droplet on zinc sheet modified with superhydrophobic diamond-UIO-66-(OH)2-epoxy resin composite coating prepared in Example 1 after heat treatment.

[0028] Figure 6 The left image is the optical image of water droplet on zinc sheet modified with superhydrophobic diamond-UIO-66-(OH)2-epoxy resin composite coating prepared in Example 1 after wear resistance test, and the right image is the optical image of water droplet on zinc sheet modified with superhydrophobic diamond-UIO-66-(OH)2-epoxy resin composite coating prepared in Example 1 after heat treatment and wear resistance treatment.

[0029] Figure 7 Optical image of water droplet on copper sheet surface modified with superhydrophobic wear-resistant corrosion-resistant diamond-UIO-66-(OH)2-based coating prepared in Example 2.

[0030] Figure 8 Optical image of water droplet on alloy surface modified with superhydrophobic wear-resistant corrosion-resistant diamond-UIO-66-(OH)2-based coating prepared in Example 3.

[0031] Figure 9 Optical photograph of water droplets on the surface of the glass slide modified with the superhydrophobic abrasion-resistant diamond-UIO-66-(OH)2coating prepared in Example 5.

[0032] Figure 10 Optical photograph of water droplets on the surface of the glass slide modified with the superhydrophobic abrasion-resistant diamond-UIO-66-(OH)2coating prepared in Example 5. DETAILED DESCRIPTION

[0033] The present application will be further described in conjunction with the examples and the accompanying drawings, but the embodiments of the present application are not limited thereto.

[0034] Example 1

[0035] The preparation method of the present example comprises the following steps:

[0036] (1) Substrate treatment: polish the zinc sheet 20 times with 800 mesh sandpaper, and ultrasonically clean the zinc sheet with deionized water and anhydrous ethanol for three cycles, and the size of the zinc sheet is 1.5 x 5.0 cm 2 , and dry for standby;

[0037] (2) Preparation of epoxy resin coating: add 0.50 g of epoxy resin and 0.33 g of polyamide curing agent to a solution of 7.5 ml of n-hexane and 7.5 ml of ethanol, ultrasonically disperse the epoxy resin and the curing agent until the solution is clear and transparent, to obtain an epoxy resin solution. Spray the epoxy resin solution on the zinc sheet, and pre-cure it in a 80°C drying oven for 18 min to obtain an epoxy resin coating;

[0038] (3) Construction of superhydrophobic properties: add 0.1 g of diamond and 0.1 g of UIO-66-(OH)2to a solution of 5 ml of n-hexane and 5 ml of ethanol, ultrasonically disperse the diamond and UIO-66-(OH)2to obtain a diamond-UIO-66-(OH)2suspension, and spray the suspension on the zinc sheet modified with the epoxy resin coating as described in step (2) using a spray gun, and then dry it in a 80°C drying oven to obtain a zinc sheet modified with a diamond-UIO-66-(OH)2-epoxy resin composite superhydrophobic coating.

[0039] As shown in Figure 1 , the surface of the zinc sheet with the superhydrophobic coating is covered with the coating of the diamond-UIO-66-(OH)2composite structure, and the water contact angle is 154°.

[0040] As shown in Figure 2As shown in the figure, the water droplets on the original zinc plate and the super-hydrophobic zinc plate are shown. The water droplets and CuSO4 mixed into CuSO4 solution are firmly stayed on the upside original zinc plate; but the water droplets can wash away the CuSO4 on the downside super-hydrophobic zinc plate.

[0041] As shown in the figure, the water droplets on the original zinc plate and the super-hydrophobic zinc plate are shown. The water droplets and CuSO4 mixed into CuSO4 solution are firmly stayed on the upside original zinc plate; but the water droplets can wash away the CuSO4 on the downside super-hydrophobic zinc plate. Figure 3 As shown in the figure, the water droplets on the original zinc plate and the super-hydrophobic zinc plate are shown. The water droplets and CuSO4 mixed into CuSO4 solution are firmly stayed on the upside original zinc plate; but the water droplets can wash away the CuSO4 on the downside super-hydrophobic zinc plate.

[0042] As shown in the figure, the water droplets on the original zinc plate and the super-hydrophobic zinc plate are shown. The water droplets and CuSO4 mixed into CuSO4 solution are firmly stayed on the upside original zinc plate; but the water droplets can wash away the CuSO4 on the downside super-hydrophobic zinc plate. Figure 4 As shown in the figure, the water droplets on the original zinc plate and the super-hydrophobic zinc plate are shown. The water droplets and CuSO4 mixed into CuSO4 solution are firmly stayed on the upside original zinc plate; but the water droplets can wash away the CuSO4 on the downside super-hydrophobic zinc plate.

[0043] As shown in the figure, the water droplets on the original zinc plate and the super-hydrophobic zinc plate are shown. The water droplets and CuSO4 mixed into CuSO4 solution are firmly stayed on the upside original zinc plate; but the water droplets can wash away the CuSO4 on the downside super-hydrophobic zinc plate. Figure 5 As shown in the figure, the water droplets on the original zinc plate and the super-hydrophobic zinc plate are shown. The water droplets and CuSO4 mixed into CuSO4 solution are firmly stayed on the upside original zinc plate; but the water droplets can wash away the CuSO4 on the downside super-hydrophobic zinc plate. Figure 5 As shown in the figure, the water droplets on the original zinc plate and the super-hydrophobic zinc plate are shown. The water droplets and CuSO4 mixed into CuSO4 solution are firmly stayed on the upside original zinc plate; but the water droplets can wash away the CuSO4 on the downside super-hydrophobic zinc plate.

[0044] As shown in the figure, the water droplets on the original zinc plate and the super-hydrophobic zinc plate are shown. The water droplets and CuSO4 mixed into CuSO4 solution are firmly stayed on the upside original zinc plate; but the water droplets can wash away the CuSO4 on the downside super-hydrophobic zinc plate. Figure 6 As shown in the figure, the water droplets on the original zinc plate and the super-hydrophobic zinc plate are shown. The water droplets and CuSO4 mixed into CuSO4 solution are firmly stayed on the upside original zinc plate; but the water droplets can wash away the CuSO4 on the downside super-hydrophobic zinc plate.

[0045] Example 2

[0046] The preparation method of the embodiment includes the following steps:

[0047] (1) Substrate treatment: The copper sheet was polished 20 times with 800 grit sandpaper and ultrasonically cleaned with deionized water and anhydrous ethanol. The size of the copper sheet was 1.5 x 5.0 cm 2 , and dried for standby use;

[0048] (2) Preparation of the epoxy resin coating: 0.60 g of epoxy resin and 0.33 g of polyamide curing agent were added to a solution of 8 ml of n-hexane and 8 ml of ethanol mixed, ultrasonicated, and the epoxy resin and curing agent were uniformly dispersed until the solution was clear and transparent, to obtain an epoxy resin solution. The epoxy resin solution was sprayed on the zinc sheet and pre-cured at room temperature for 4 h to obtain an epoxy resin coating;

[0049] (3) Construction of super-hydrophobic properties: 0.12 g of diamond and 0.1 g of UIO-66-(OH)2 were added to a solution of 5 ml of n-hexane and 5 ml of ethanol mixed, ultrasonicated, and a diamond-UIO-66-(OH)2 suspension was obtained. The suspension was sprayed on the copper sheet with the epoxy resin coating attached as described in step (2) using a spray gun, and then placed in a drying oven at 80°C to dry, to obtain a diamond-UIO-66-(OH)2-epoxy resin composite super-hydrophobic wear-resistant corrosion-resistant coating modified copper sheet.

[0050] As shown in Figure 7 , the water droplets on the surface of the super-hydrophobic wear-resistant corrosion-resistant copper sheet were approximately spherical, indicating that the super-hydrophobic wear-resistant corrosion-resistant copper sheet had excellent hydrophobicity.

[0051] Example 3

[0052] The preparation method of this example includes the following steps:

[0053] (1) Substrate treatment: The alloy sheet was polished 20 times with 800 grit sandpaper and ultrasonically cleaned with deionized water and anhydrous ethanol. The size of the alloy sheet was 2.5 x 5.0 cm 2 , and dried for standby use;

[0054] (2) Preparation of the epoxy resin coating: 0.55 g of epoxy resin and 0.35 g of polyamide curing agent were added to a solution of 7.5 ml of n-hexane and 7.5 ml of ethanol mixed, ultrasonicated, and the epoxy resin and curing agent were uniformly dispersed until the solution was clear and transparent, to obtain an epoxy resin solution. The epoxy resin solution was sprayed on the alloy sheet and pre-cured at room temperature for 4.5 h to obtain an epoxy resin coating;

[0055] (3) Construction of superhydrophobic property: 0.08 g of diamond and 0.09 g of UIO-66-(OH)2 were added into a solution of 5 ml of n-hexane and 5 ml of ethanol mixed, and ultrasonic was performed to obtain a diamond-UIO-66-(OH)2 suspension. The suspension was sprayed on the alloy sheet with the epoxy resin coating attached as described in step (2) by using an airbrush, and then was placed in a drying oven at 80°C for drying to obtain a diamond-UIO-66-(OH)2-epoxy resin composite superhydrophobic wear-resistant anticorrosive coating modified alloy sheet.

[0056] As shown in FIG. 5, the water droplets on the surface of the superhydrophobic wear-resistant anticorrosive alloy sheet were approximately spherical, indicating that the superhydrophobic wear-resistant anticorrosive alloy sheet had excellent hydrophobicity. Figure 8

[0057] Example 4

[0058] The preparation method of this example includes the following steps:

[0059] (1) Substrate treatment: The aluminum sheet was polished 20 times with 800 mesh sandpaper, and was ultrasonically cleaned with deionized water and anhydrous ethanol. The size of the aluminum sheet was 1.5 x 5.0 cm 2 , and was dried for standby use;

[0060] (2) Preparation of epoxy resin coating: 0.55 g of epoxy resin and 0.35 g of polyamide curing agent were added into a solution of 7.5 ml of n-hexane and 7.5 ml of ethanol mixed, and ultrasonic was performed to disperse the epoxy resin and the curing agent uniformly until the solution was clear and transparent to obtain an epoxy resin solution. The epoxy resin solution was sprayed on the aluminum sheet, and was placed in a drying oven at 80°C for pre-curing for 20 min to obtain an epoxy resin coating;

[0061] (3) Construction of superhydrophobic property: 0.15 g of diamond and 0.09 g of UIO-66-(OH)2 were added into a solution of 5 ml of n-hexane and 5 ml of ethanol mixed, and ultrasonic was performed to obtain a diamond-UIO-66-(OH)2 suspension. The suspension was sprayed on the aluminum sheet with the epoxy resin coating attached as described in step (2) by using an airbrush, and then was placed in a drying oven at 80°C for drying to obtain a diamond-UIO-66-(OH)2-epoxy resin composite superhydrophobic wear-resistant anticorrosive coating modified aluminum sheet.

[0062] As shown in FIG. 5, the water droplets on the surface of the superhydrophobic wear-resistant anticorrosive alloy sheet were approximately spherical, indicating that the superhydrophobic wear-resistant anticorrosive alloy sheet had excellent hydrophobicity. Figure 9

[0063] Example 5

[0064] The preparation method of this example includes the following steps:

[0065] ​​(1) Substrate treatment: the glass slides were cleaned by ultrasonic treatment with deionized water and anhydrous ethanol, respectively, and the size of the glass slides was 2.5*2.5cm 2 , and dried for standby use;

[0066] (2) Preparation of epoxy resin coating: 0.52g of epoxy resin and 0.30g of polyamide curing agent were added to a solution of 7.5ml of n-hexane and 7.5ml of ethanol mixed, ultrasonic treatment was performed to disperse the epoxy resin and the curing agent uniformly until the solution was clear and transparent, to obtain an epoxy resin solution. The epoxy resin solution was sprayed on the glass slide, and pre-cured at room temperature for 4.5h to obtain an epoxy resin coating;

[0067] (3) Construction of super-hydrophobic properties: 0.12g of diamond and 0.08g of UIO-66-(OH)2 were added to a solution of 4ml of n-hexane and 6ml of ethanol mixed, ultrasonic treatment was performed to obtain a diamond-UIO-66-(OH)2 suspension, the suspension was sprayed on the glass slide with the epoxy resin coating attached as described in step (2) using a spray gun, and then placed in a drying oven at 80℃ to dry, to obtain a diamond-UIO-66-(OH)2-epoxy resin composite super-hydrophobic wear-resistant coating modified glass slide.

[0068] As shown in Figure 10 , the water droplets on the surface of the super-hydrophobic wear-resistant glass slide were approximately spherical, indicating that the super-hydrophobic wear-resistant glass slide had excellent hydrophobicity.

[0069] As shown in Table 1, the specific parameters of the water contact angle and the wear-resistant distance are as follows. Figures 5-10

[0070] Table 1

[0071]

[0072] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.​

Claims

1. A method for preparing a diamond-UIO-66-(OH)2-epoxy resin composite superhydrophobic coating, characterized in that, The method comprises the following steps: (1) ultrasonic dispersion of epoxy resin and polyamide curing agent in an organic solvent until the solution is clear and transparent to obtain an epoxy resin solution; pre-curing of the epoxy resin solution by spraying on the surface of a substrate to obtain an epoxy resin coating; (2) adding diamond and UIO-66-(OH)2 into an organic solvent and ultrasonic dispersion to obtain a diamond-UIO-66-(OH)2 suspension; (3) spraying the diamond-UIO-66-(OH)2 suspension of step (2) onto the epoxy resin coating of step (1) and drying to obtain a diamond-UIO-66-(OH)2-epoxy resin composite super-hydrophobic coating. The organic solvent of steps (1) and (2) is a mixed solution of n-hexane and ethanol in a volume ratio of 1: (0.5-2.0).

2. The production method according to claim 1, characterized by, The concentration of epoxy resin in the epoxy resin solution of step (1) is 25-40 g / L, and the concentration of polyamide curing agent is 15-25 g / L.

3. The preparation method according to claim 1, characterized in that, The mass-volume ratio of diamond to organic solvent in step (2) is 0.002-0.02 g / ml, and the mass-volume ratio of UIO-66-(OH)2 to organic solvent is 0.002-0.02 g / ml.

4. The production method according to claim 1 or 2 or 3, characterized by, The epoxy resin coating of step (1) is pre-cured at room temperature for 1-5 h or in a drying oven at 80 ℃ for 5-20 min; the ultrasonic dispersion time of step (1) is 10-30 min; and the ultrasonic dispersion time of step (2) is 10-30 min.

5. The production method according to claim 1 or 2 or 3, characterized by, The UIO-66-(OH)2 of step (2) is synthesized by hydrothermal reaction of ZrCl4, 2,5-dihydroxyterephthalic acid, N,N-dimethylammonium formate, glacial acetic acid and water in a hydrothermal kettle at 120±20 ℃ for 24±12 h.

6. The production method according to claim 1 or 2 or 3, characterized by, The drying temperature of step (3) is 80-120 ℃, and the drying time is 10-30 min.

7. The production method according to claim 1 or 2 or 3, characterized by, The substrate of step (1) is uniformly polished 20-30 times with 800±100 mesh sandpaper and then washed with ethanol and water by ultrasonic circulation; the substrate is one of metal materials and inorganic materials, wherein the metal materials include zinc, aluminum, copper, iron, stainless steel mesh, aluminum foil, and the inorganic materials include glass slides.

8. The diamond-UIO-66-(OH)2-epoxy resin composite super-hydrophobic coating prepared by the method of any one of claims 1-7.

9. Use of the diamond-UIO-66-(OH)2-epoxy resin composite superhydrophobic coating according to claim 8, characterized in that, The composite super-hydrophobic coating is applied to building materials; or applied to the separation of oil-water mixtures; or the composite super-hydrophobic coating is attached to the surface of an airplane, submarine, ship or cable.

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