Super-wear-resistant super-hydrophobic coating and preparation method thereof

Abstract

The invention discloses a super-wear-resistant super-hydrophobic coating in the technical field of coatings, the super-wear-resistant super-hydrophobic coating comprises a primer and a finishing coat, the primer comprises solvent-free aliphatic polyether polyol resin, micro-powder particles, di-tetratoluene diisocynate, fumed silica nanoparticles and a primer magnetic attraction material; the finishing paint comprises hydrophobic nanoparticles, a diluent, a finishing paint magnetic attraction material and a hydrophobic treatment agent, the primer magnetic attraction material is ferrite powder, and the finishing paint magnetic attraction material is nickel powder. The preparation method comprises the following steps: 1, preparing the primer; secondly, primer is sprayed; step 3, roughening the primer; 4, finish paint is manufactured; step 5, spraying finish paint; and step 6, detecting the performance of the coating. The preparation method is scientific and reasonable, the uniformity and stability of the coating in the preparation and coating process are ensured by optimizing the composition of the coating material, improving the preparation process and introducing a magnetic suction device, and therefore the wear resistance, hydrophobicity and adhesive force of the coating are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a super wear-resistant and super hydrophobic coating and a preparation method thereof. Background Art

[0002] In the field of coating technology, super-wear-resistant and super-hydrophobic coatings have attracted much attention due to their unique properties. Super-wear-resistant and super-hydrophobic coatings have broad application prospects in many fields such as construction, ships, aircraft, and automobiles due to their unique properties. This coating can significantly improve the wear resistance, water resistance, and self-cleaning ability of objects, thereby extending the service life of objects and reducing maintenance costs.

[0003] However, the super wear-resistant super hydrophobic coating in the prior art often has the problem of uneven coating during the preparation process, which seriously affects the performance of the coating. Uneven coating may cause the coating to perform poorly in terms of wear resistance, hydrophobicity and adhesion, thereby limiting its wide promotion in practical applications. Uneven coating may be caused by poor dispersibility of the coating material during the preparation process, insufficiently advanced coating technology or improper substrate treatment. These problems make the surface roughness of the coating inconsistent after curing, and there are defects, which in turn affects its overall performance.

[0004] In summary, the uneven coating of existing super-wear-resistant and super-hydrophobic coatings leads to poor performance, which has become a problem that technicians in this field need to solve urgently. Therefore, it is necessary to propose a super-wear-resistant and super-hydrophobic coating and a preparation method thereof. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a super wear-resistant and super hydrophobic coating and a preparation method thereof, by optimizing the composition of the coating material, improving the preparation process and introducing a magnetic suction device, ensuring the uniformity and stability of the coating during the preparation and coating process, thereby improving the wear resistance, hydrophobicity and adhesion of the coating.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a super wear-resistant and super hydrophobic coating, comprising a primer and a topcoat, the primer comprising a solvent-free aliphatic polyether polyol resin, micropowder particles, ditetramethylbenzene diisocyanate, fumed silica nanoparticles and a primer magnetic material; the topcoat comprising hydrophobic nanoparticles, a diluent, a topcoat magnetic material and a hydrophobic treatment agent, wherein the primer magnetic material is ferrite powder and the topcoat magnetic material is nickel powder.

[0007] A method for preparing a super wear-resistant super hydrophobic coating comprises the following steps:

[0008] Step 1: primer preparation; Step 2: primer spraying; Step 3: primer roughening; Step 4: topcoat preparation; Step 5: topcoat spraying; Step 6: coating performance testing;

[0009] In step 1, the primer preparation process is to mix the solvent-free aliphatic polyether polyol resin with the selected micropowder particles, and stir them evenly in a stirrer for at least 30 minutes until a uniform mixture is formed, the micropowder particles include one of sludge powder, fly ash, silica powder, clay powder and kaolin powder, and the addition amount is 10%-30% of the weight of the solvent-free aliphatic polyether polyol resin, and the mixture is allowed to stand for at least 2 hours to remove bubbles; then, ditetramethylbenzene diisocyanate and fumed silica nanoparticles, as well as primer magnetic absorption material are added to the mixture, and stirred again for at least 15 minutes until uniform to form a primer, the ditetramethylbenzene diisocyanate addition amount is 5%-15% of the weight of the resin, the fumed silica nanoparticles addition amount is 1%-5% of the weight of the resin, and the magnetic absorption material addition amount is 0.5%-2% of the weight of the resin.

[0010] Furthermore, in step 2, the primer spraying process is to spray the prepared primer on the selected substrate surface with a coating thickness of 50-200 microns, install a magnetic suction device on the side away from the sprayed primer to magnetically smooth the primer, and let it stand at room temperature for at least 24 hours to solidify. The substrate surface includes one of glass, cement, ceramic, metal, wood and plastic.

[0011] Furthermore, the magnetic suction device in step 2 includes a suction box and a controller, negative pressure holes are opened on all sides of the top of the suction box, the negative pressure holes are combined to form a square, a pump assembly is fixedly connected to the bottom of the negative pressure holes, the input end of the pump assembly is connected to the negative pressure holes, an electromagnet group composed of a plurality of electromagnets is fixedly connected to the center of the top of the suction box, a coating thickness gauge is fixedly connected to the bottom of the electromagnet group, the magnetic pole of the coating thickness gauge passes through the electromagnet group and extends to the top of the electromagnet group, a battery is fixedly connected to the bottom of the coating thickness gauge, and the controller is fixedly connected to the bottom of the suction box, and the pump assembly, the electromagnet group, the coating thickness gauge, and the battery are all connected to the controller signal.

[0012] Further, in step three, the primer roughening treatment is to roughen the surface of the cured primer by one of the methods of high-pressure sandblasting, coarse sandpaper and grinding wheel grinding. The surface roughness of the treated primer should reach Ra=2.5-5.0 microns, the high-pressure sandblasting pressure is 0.4-0.6MPa, the coarse sandpaper particle size is P80-P240, and the grinding wheel grinding speed is 20-40m / s.

[0013] Further, in step 4, the topcoat preparation process is as follows: adding the selected hydrophobic nanoparticles to the diluent and dispersing them evenly in an ultrasonic agitator, and the ultrasonic time is 15-30 minutes; adding the topcoat magnetic material to the topcoat as needed, and ultrasonically stirring again for 10-20 minutes to disperse them evenly; the hydrophobic nanoparticles include multiple or one of silicon dioxide, zinc oxide, titanium dioxide, and polypropylene, and the amount of hydrophobic nanoparticles added is 5%-20% of the total weight of the topcoat; the diluent includes multiple or one of volatile esters, ketones, benzene, and ethers, and the mass ratio of the diluent to the nanoparticles is 2:1 to 5:1; the amount of the topcoat magnetic material added is 0.5%-2% of the total weight of the topcoat; finally, a hydrophobic treatment agent is added and stirring is continued for 30-60 minutes, and the hydrophobic treatment agent includes alkyl siloxane and fluoroalkyl siloxane, and the amount added is 1%-5% of the total weight of the topcoat.

[0014] Furthermore, in step five, the topcoat spraying process is that the topcoat is sprayed on the roughened primer surface with a coating thickness of 20-100 microns, and a magnetic suction device is installed on the side away from the sprayed topcoat to magnetically smooth the topcoat, and the topcoat is left to stand at room temperature for at least 12 hours to dry naturally.

[0015] Furthermore, in step 5, the topcoat is filtered before spraying, and a 100-200 mesh filter is used for the filtering process.

[0016] Furthermore, the coating performance test in step six includes a wear resistance test, a hydrophobic performance test and an adhesion test. The wear resistance test is performed using a Taber wear tester; the hydrophobic performance test is performed using a contact angle meter; and the adhesion strength test is performed using a pull-off method.

[0017] Furthermore, the coating composed of the primer and the topcoat has a Mohs hardness of 6-7 and a hydrophobic angle of greater than 150°.

[0018] The following principles and beneficial effects are achieved by adopting the above scheme:

[0019] Basic principle: The primer uses solvent-free aliphatic polyether polyol resin as the matrix, combined with selected micropowder particles, diisocyanate, fumed silica nanoparticles and primer magnetic materials to form a strong and adhesive base layer. The topcoat is endowed with super hydrophobic properties by adding hydrophobic nanoparticles, diluents, topcoat magnetic materials and hydrophobic treatment agents. The close combination of primer and topcoat ensures the overall performance of the coating. During the coating process of primer and topcoat, a magnetic device is introduced to smooth the coating surface through magnetic attraction, eliminate bubbles and unevenness, and ensure the uniformity and flatness of the coating. At the same time, the coating thickness gauge in the magnetic device can monitor the coating thickness in real time to ensure the coating quality. The primer surface is roughened to increase the bonding force between the primer and the topcoat. A hydrophobic treatment agent is added to the topcoat to form a super hydrophobic surface, which improves the waterproofness and self-cleaning ability of the coating.

[0020] Beneficial effects:

[0021] 1. The ferrite powder of the primer of the present invention, as a magnetic material, can effectively guide the primer to be evenly distributed on the substrate through the effect of an external magnetic field, reduce the pores and defects in the coating, thereby improving the compactness and uniformity of the coating. At the same time, ferrite powder can also form a good chemical bond with the resin matrix, strengthen the adhesion between the primer and the substrate, and make the coating more firm and durable. The nickel powder in the topcoat, as a magnetic material, can also be used to assist the topcoat to form a more flat and smooth coating on the primer through the effect of an external magnetic field. Nickel powder has good wear resistance and scratch resistance, and can significantly improve the surface hardness and durability of the coating. In addition, nickel powder can also work together with components such as hydrophobic nanoparticles and diluents to form a more compact and dense coating structure, thereby improving the super-hydrophobic performance of the coating.

[0022] 2. The solvent-free aliphatic polyether polyol resin, micropowder particles and di-tetramethylbenzene diisocyanate and other components of the primer of the present invention form a solid bottom layer structure, which significantly improves the wear resistance of the coating.

[0023] 3. The hydrophobic nanoparticles and the hydrophobic treatment agent of the topcoat of the present invention work together to form a super-hydrophobic surface, so that the coating has excellent water resistance and self-cleaning ability.

[0024] 4. The fumed silica nanoparticles and magnetic attraction material of the primer of the present invention, as well as the close combination between the primer and the topcoat, significantly enhance the adhesion between the coating and the substrate.

[0025] 5. The present invention effectively eliminates bubbles and unevenness on the coating surface by introducing a magnetic suction device, thereby improving the uniformity and flatness of the coating.

[0026] 6. The primer of the present invention adopts a solvent-free formula, which reduces the emission of volatile organic compounds and meets environmental protection requirements. At the same time, the introduction of the magnetic suction device improves the coating efficiency and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flow chart of an embodiment of the present invention.

[0028] Figure 2 It is an axonometric view of a special magnetic device according to an embodiment of the present invention.

[0029] Figure 3 It is a side cross-sectional view of an embodiment of the present invention.

[0030] The figure marks in the drawings of the specification include: 1. suction box; 2. negative pressure hole mesh; 3. magnetic pole; 4. electromagnet group; 5. coating thickness gauge; 6. controller; 7. battery; 8. pump assembly. DETAILED DESCRIPTION

[0031] The following is further described in detail through specific implementation methods:

[0032] Example 1

[0033] Basically as attached Figure 1 As shown: A super wear-resistant and super hydrophobic coating includes a primer and a topcoat, wherein the primer includes a solvent-free aliphatic polyether polyol resin, selected micropowder particles, diisocyanate, fumed silica nanoparticles and a primer magnetic material; the topcoat includes selected hydrophobic nanoparticles, a diluent, a topcoat magnetic material and a hydrophobic treatment agent, wherein the primer magnetic material is ferrite powder and the topcoat magnetic material is nickel powder.

[0034] The specific implementation process is as follows: The experimental results of different ratios are shown in Table 1:

[0035] Table 1

[0036]

[0037]

[0038] Example 2

[0039] Basically as attached Figure 1-3 As shown, the difference from the above embodiment is that a method for preparing a super wear-resistant super hydrophobic coating comprises the following steps:

[0040] Step 1, primer preparation: the solvent-free aliphatic polyether polyol resin is mixed with the selected micro-powder particles, and the micro-powder particles are uniformly stirred in a stirrer for at least 30 minutes until a uniform mixture is formed, the micro-powder particles include one of sludge powder, fly ash, silicon micro-powder, clay powder and kaolin powder, and the addition amount is 10%-30% of the weight of the solvent-free aliphatic polyether polyol resin, and the mixture is allowed to stand for at least 2 hours to remove bubbles; then, di-tetramethylbenzene diisocyanate and fumed silica nanoparticles, as well as primer magnetic materials, are added to the mixture, and stirred again for at least 15 minutes until uniform to form a primer, the addition amount of di-tetramethylbenzene diisocyanate is 5%-15% of the weight of the resin, the addition amount of fumed silica nanoparticles is 1%-5% of the weight of the resin, and the addition amount of magnetic materials is 0.5%-2% of the weight of the resin. By optimizing the formula of the primer and topcoat, especially the addition of micro-powder particles and di-tetramethylbenzene diisocyanate, the wear resistance of the coating is significantly improved, so that it can resist the erosion of various harsh environments. The fumed silica nanoparticles and magnetic materials in the primer, as well as the close bonding between the primer and the topcoat, significantly enhance the adhesion between the coating and the substrate, and improve the stability and durability of the coating.

[0041] Step 2, spraying primer: spray the prepared primer on the selected substrate surface with a coating thickness of 50-200 microns, install a magnetic suction device on the side away from the sprayed primer to magnetically smooth the primer, and let it stand at room temperature for at least 24 hours to solidify. The substrate surface includes one of glass, cement, ceramics, metal, wood and plastic.

[0042] The magnetic suction device in step 2 includes a suction box 1 and a controller 6. Negative pressure hole nets 2 are opened all around the top of the suction box 1. The negative pressure hole nets 2 are combined to form a square. The bottom of the negative pressure hole net 2 is fixedly connected to a pump assembly 8 by screws. The input end of the pump assembly 8 is connected to the negative pressure hole net 2. An electromagnet group 4 composed of a plurality of electromagnets is fixedly connected to the center of the top of the suction box 1 by screws. A coating thickness gauge 5 is fixedly connected to the bottom of the electromagnet group 4 by screws. The magnetic pole 3 of the coating thickness gauge 5 passes through the electromagnet group 4 and extends to the top of the electromagnet group 4. The bottom of the coating thickness gauge 5 is fixedly connected to a battery 7 by screws. The controller 6 is fixedly connected to the bottom of the suction box 1 by screws. The pump assembly 8, the electromagnet group 4, the coating thickness gauge 5, and the battery 7 are all connected to the controller 6 signal.

[0043] Step 3, primer roughening treatment: use one of the high-pressure sandblasting, coarse sandpaper and grinding wheel grinding methods to roughen the cured primer surface. The surface roughness of the treated primer should reach Ra = 2.5-5.0 microns, the high-pressure sandblasting pressure is 0.4-0.6MPa, the coarse sandpaper particle size is P80-P240, and the grinding wheel grinding speed is 20-40m / s.

[0044] Step 4, topcoat preparation: add the selected hydrophobic nanoparticles to the diluent and disperse them evenly in an ultrasonic stirrer for 15-30 minutes; add the topcoat magnetic material to the topcoat as needed, and stir ultrasonically for 10-20 minutes again to disperse them evenly; the hydrophobic nanoparticles include multiple or one of silicon dioxide, zinc oxide, titanium dioxide, and polypropylene, and the amount of hydrophobic nanoparticles added is 5%-20% of the total weight of the topcoat; the diluent includes multiple or one of volatile esters, ketones, benzene, and ethers, and the mass ratio of the diluent to the nanoparticles is 2:1 to 5:1, and the amount of the topcoat magnetic material added is 0.5%-2% of the total weight of the topcoat; finally, add a hydrophobic treatment agent and continue stirring for 30-60 minutes, and the hydrophobic treatment agent includes alkyl siloxane and fluoroalkyl siloxane, and the amount added is 1%-5% of the total weight of the topcoat. The hydrophobic nanoparticles and the hydrophobic treatment agent in the topcoat work together to form a dense hydrophobic layer, so that the coating has excellent waterproof performance and self-cleaning ability.

[0045] Step 5, topcoat spraying: The topcoat is sprayed on the roughened primer surface with a coating thickness of 20-100 microns. A magnetic device is installed on the side away from the topcoat spraying to magnetically smooth the topcoat. At the same time, it is left to stand at room temperature for at least 12 hours to dry naturally. The topcoat is filtered before spraying, and a 100-200 mesh filter is used for filtering. By introducing the magnetic device and filtering treatment, bubbles and unevenness on the coating surface are effectively eliminated, and the uniformity and flatness of the coating are improved. At the same time, the magnetic device can also monitor the coating thickness in real time to ensure the coating quality.

[0046] Step 6, coating performance test: The prepared coating is tested for performance, including wear resistance test, hydrophobic performance test and adhesion test. The wear resistance test is conducted using a Taber wear tester; the hydrophobic performance test is conducted using a contact angle meter; and the adhesion strength test is conducted using the pull-off method. The Mohs hardness of the coating composed of the primer and topcoat reaches 6-7, and the hydrophobic angle is greater than 150°.

[0047] Specific implementation steps: first select solvent-free aliphatic polyether polyol resin as the base resin, sludge powder as the micropowder, the addition amount is 20% of the resin weight, ditetramethylbenzene diisocyanate, the addition amount is 10% of the resin weight, fumed silica nanoparticles, the addition amount is 3% of the resin weight, and ferrite powder as the primer magnetic material, the addition amount is 1% of the resin weight.

[0048] The resin and sludge powder were stirred evenly in a blender for 30 minutes to form a uniform mixture. The mixture was left to stand for 2 hours to remove bubbles. Di-tetramethylbenzene diisocyanate, fumed silica nanoparticles and ferrite powder were added to the mixture and stirred again for 15 minutes until uniform to form a primer. The addition of ferrite powder can enhance the magnetic responsiveness of the primer, facilitate the subsequent use of a magnetic suction device to smooth the primer surface, and also help improve the adhesion between the coating and the substrate.

[0049] Select a clean metal substrate to ensure that there is no impurities such as oil stains and rust on its surface. Use a spray gun to evenly spray the prepared primer on the surface of the metal substrate with a coating thickness of 100 microns. A magnetic suction device is installed on the side of the substrate away from the spray primer, including a suction box 1 and a controller 6. A negative pressure hole net 2 and an electromagnet group 4 are provided on the top of the suction box 1. The device is started, the battery 7 is powered, the pump assembly 8 is started, the negative pressure hole net 2 generates a negative pressure to adsorb the surface of the substrate without spraying the primer, and the magnetic pole 3 directly contacts the substrate. The electromagnet group 4 generates a magnetic field to attract the ferrite powder in the primer. The coating thickness gauge 5 measures the coating thickness at various locations in real time and transmits the data to the controller 6. The controller 6 controls the operating parameters of the magnetic suction device according to the preset coating thickness to make the primer smoother. At the same time, the primer is left to stand at room temperature for at least 24 hours to fully cure. This process effectively eliminates the unevenness of the coating surface and improves the uniformity and flatness of the coating. The magnetic field effect during the magnetic suction process helps to promote the intermolecular interaction between the coating and the substrate, thereby enhancing the adhesion of the coating.

[0050] Roughening treatment: Use high-pressure sandblasting to roughen the surface of the cured primer. Set the sandblasting pressure to 0.5MPa and the sandblasting distance to an appropriate value to ensure that the primer surface roughness reaches Ra = 3.5 microns.

[0051] Select silicon dioxide as hydrophobic nanoparticles, the addition amount is 10% of the total weight of the topcoat, volatile ester diluent, the mass ratio of diluent to nanoparticles is 3:1, nickel powder is used as the magnetic material of the topcoat, the addition amount is 1% of the total weight of the topcoat, and alkyl siloxane is used as the hydrophobic treatment agent, the addition amount is 3% of the total weight of the topcoat. Add silicon dioxide to the diluent and disperse it evenly in an ultrasonic agitator for 20 minutes. Then add nickel powder and stir it ultrasonically again for 15 minutes to evenly disperse it. Finally, add the hydrophobic treatment agent and continue stirring for 45 minutes. The addition of nickel powder not only enhances the magnetic responsiveness of the topcoat, but also helps to improve the hardness and wear resistance of the coating.

[0052] Use a 150 mesh filter to filter the topcoat to remove impurities and particles. Spray the filtered topcoat evenly on the roughened primer surface with a coating thickness of 50 microns. Also use a magnetic suction device to magnetically smooth the topcoat to ensure that the topcoat surface is flat and free of bubbles. Leave the topcoat at room temperature for at least 12 hours to allow it to dry naturally.

[0053] Abrasion resistance test: Use Taber abrasion tester to test the coating's abrasion resistance and record the test results. Hydrophobic performance test: Use contact angle meter to test the coating's hydrophobic performance and measure the hydrophobic angle.

[0054] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A super wear-resistant super hydrophobic coating, characterized in that: The invention comprises a primer and a topcoat, wherein the primer is made of a solvent-free aliphatic polyether polyol resin, micropowder particles, di-tetramethylbenzene diisocyanate, fumed silica nanoparticles and a primer magnetic material; and the topcoat is made of hydrophobic nanoparticles, a diluent, a topcoat magnetic material and a hydrophobic treatment agent. Among them, the magnetic material of the primer is ferrite powder, and the magnetic material of the topcoat is nickel powder.

2. A method for preparing a super wear-resistant super hydrophobic coating, characterized in that: The following steps are involved: Step 1: primer preparation; Step 2: primer spraying; Step 3: primer roughening; Step 4: topcoat preparation; Step 5: topcoat spraying; Step 6: coating performance testing; In step 1, the primer preparation process is to mix the solvent-free aliphatic polyether polyol resin with selected micropowder particles, and uniformly stir them in a stirrer for at least 30 minutes until a uniform mixture is formed, the micropowder particles include one of sludge powder, fly ash, silica powder, clay powder and kaolin powder, and the addition amount is 10%-30% of the weight of the solvent-free aliphatic polyether polyol resin, and the mixture is allowed to stand for at least 2 hours to remove bubbles; Add tetramethylbenzene diisocyanate, fumed silica nanoparticles, and primer magnetic material to the mixture, and stir again for at least 15 minutes until it is uniform to form a primer. The amount of tetramethylbenzene diisocyanate added is 5%-15% of the weight of the resin, the amount of fumed silica nanoparticles added is 1%-5% of the weight of the resin, and the amount of magnetic material added is 0.5%-2% of the weight of the resin.

3. The super wear-resistant super hydrophobic coating and preparation method thereof according to claim 2, characterized in that: In step 2, the primer spraying process is to spray the prepared primer on the selected substrate surface with a coating thickness of 50-200 microns, install a magnetic suction device on the side away from the sprayed primer to magnetically smooth the primer, and let it stand at room temperature for at least 24 hours to solidify. The substrate surface includes one of glass, cement, ceramics, metal, wood and plastic.

4. The super wear-resistant super hydrophobic coating and preparation method thereof according to claim 3, characterized in that: The magnetic suction device in step 2 comprises a suction box (1) and a controller (6). Negative pressure holes (2) are provided around the top of the suction box (1). The negative pressure holes (2) are combined to form a square. A pump assembly (8) is fixedly connected to the bottom of the negative pressure holes (2). The input end of the pump assembly (8) is connected to the negative pressure holes (2). An electromagnet group (4) composed of a plurality of electromagnets is fixedly connected to the center of the top of the suction box (1). A coating thickness gauge (5) is fixedly connected to the bottom of the electromagnet group (4). The magnetic pole (3) of the coating thickness gauge (5) passes through the electromagnet group (4) and extends to the top of the electromagnet group (4). A storage battery (7) is fixedly connected to the bottom of the coating thickness gauge (5). The controller (6) is fixedly connected to the bottom of the suction box (1). The pump assembly (8), the electromagnet group (4), the coating thickness gauge (5) and the storage battery (7) are all connected to the controller (6) by signal.

5. The super wear-resistant super hydrophobic coating and preparation method thereof according to claim 4, characterized in that: In step three, the primer roughening treatment is to roughen the surface of the cured primer by one of the methods of high-pressure sandblasting, coarse sandpaper and grinding wheel grinding. The surface roughness of the treated primer should reach Ra = 2.5-5.0 microns, the high-pressure sandblasting pressure is 0.4-0.6MPa, the coarse sandpaper particle size is P80-P240, and the grinding wheel grinding speed is 20-40m / s.

6. The super wear-resistant super hydrophobic coating and preparation method thereof according to claim 5, characterized in that: In step 4, the topcoat preparation process is to add the selected hydrophobic nanoparticles to the diluent and disperse them evenly in an ultrasonic stirrer for 15-30 minutes; add the topcoat magnetic material to the topcoat as needed, and ultrasonically stir again for 10-20 minutes to evenly disperse them; The hydrophobic nanoparticles include multiple or one of silicon dioxide, zinc oxide, titanium dioxide, and polypropylene, and the amount of the hydrophobic nanoparticles added is 5%-20% of the total weight of the topcoat. The diluent includes multiple or one of volatile esters, ketones, benzene, and ethers, and the mass ratio of the diluent to the nanoparticles is 2:1 to 5:

1. The amount of the magnetic material added to the topcoat is 0.5%-2% of the total weight of the topcoat. Finally, a hydrophobic treatment agent is added and stirring is continued for 30-60 minutes. The hydrophobic treatment agent includes alkyl siloxane and fluoroalkyl siloxane, and the amount added is 1%-5% of the total weight of the topcoat.

7. The super wear-resistant super hydrophobic coating and preparation method thereof according to claim 6, characterized in that: In step five, the topcoat spraying process is that the topcoat is sprayed on the roughened primer surface with a coating thickness of 20-100 microns, and a magnetic suction device is installed on the side away from the sprayed topcoat to magnetically smooth the topcoat, and the topcoat is left to stand at room temperature for at least 12 hours to dry naturally.

8. The super wear-resistant super hydrophobic coating and preparation method thereof according to claim 7, characterized in that: In step 5, the topcoat is filtered before spraying, and a 100-200 mesh filter is used for filtering.

9. The super wear-resistant super hydrophobic coating and preparation method thereof according to claim 8, characterized in that: In step six, the coating performance test includes a wear resistance test, a hydrophobic performance test and an adhesion test. The wear resistance test is performed using a Taber wear tester; the hydrophobic performance test is performed using a contact angle meter; and the adhesion strength test is performed using a pull-off method.

10. The super wear-resistant super hydrophobic coating and preparation method thereof according to claim 9, characterized in that: The coating composed of the primer and the topcoat has a Mohs hardness of 6-7 and a hydrophobic angle greater than 150°.

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