Thin-coating wear-resistant super-hydrophobic conformal coating and preparation method thereof

Abstract

The preparation method comprises the following steps: adding 10-20 parts by weight of a modified filler treated by a sol-gel method and a surface treating agent, 60-70 parts by weight of matrix resin, 10-15 parts by weight of an acrylic monomer and 4-6 parts by weight of a photoinitiator into a planetary stirrer, stirring for 90-120 minutes at the rotating speed of 40-60 Hz, and discharging to obtain the thin-coated wear-resistant super-hydrophobic conformal coating. The water contact angle of the conformal coating is up to 165 degrees, the water contact angle is still larger than 150 degrees after a load-bearing wear resistance test, the PCB / PCBA board is glued, the wet film thickness is 30 microns, the items of salt mist, double-85, cold and hot impact and the like are tested after complete curing, the test is qualified, and the protection performance is excellent.

Description

Technical Field

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

[0002] PCB / PCBA is one of the most important basic electronic components in the electronics industry. It realizes the function of the circuit through the installation and connection of electronic components, so its stability and functionality directly affect the performance and reliability of the equipment. However, substances such as water vapor, corrosive gases or other physical factors can cause irreversible damage to PCB / PCBA boards.

[0003] With the continuous development of industrial technology, material surface treatment technology plays an increasingly important role in all walks of life. Especially in the fields of electronic equipment, automobile manufacturing, aerospace, etc., higher requirements are placed on the moisture-proof, anti-bacteria, and salt spray-proof properties of materials. The coating thickness of traditional three-proof paint is relatively large. Usually, the dry film thickness of the adhesive layer needs to reach about 100μm to have a good protective effect.

[0004] Super-hydrophobic coatings have received extensive attention due to their superior protective properties. If the super-hydrophobic properties are combined with conformal coatings, the protection problem of PCB boards can be better solved. However, the wear resistance of super-hydrophobic coatings currently on the market is poor. After friction, the coating is damaged or peeled off, which will reduce its hydrophobicity. In the electrical and electronic industry, PCB / PCBA boards use conformal coating protection solutions. During the production and quality inspection processes, there will be actions such as picking, taking, placing, and placing. During such operations, the coating will contact and rub against hands, gloves, machine parts and components. Conventional super-hydrophobic coatings have poor wear resistance and are damaged or fall off from the PCB or PCBA board during the above-mentioned contact or friction process, resulting in a decrease in protective performance or even a complete loss of protective performance. Summary of the invention

[0005] The purpose of the present invention is to provide a thin-coat wear-resistant super-hydrophobic conformal coating and a preparation method thereof in view of the deficiencies in the prior art. The conformal coating has excellent wear resistance and super-hydrophobic properties. After the load-bearing wear test, the water contact angle is still greater than 150°, and a thin coating (coating thickness 30 μm) can achieve an efficient protective effect. The coating has excellent wear resistance, overcomes the problem of coating damage or shedding caused by friction during the use of the conformal coating, and is conducive to improving the stability of the super-hydrophobic conformal coating on the protection of PCB or PCBA boards.

[0006] The purpose of the present invention is achieved through the following technical solutions: First, the present invention provides a thin-coat wear-resistant super-hydrophobic conformal paint, which comprises the following raw material components by weight: 60-70 parts of base resin, 10-20 parts of modified filler, 10-15 parts of acrylic acid monomer, 4 to 6 parts of photoinitiator.

[0007] Furthermore, the base resin is made of α,ω-dihydroxypolydimethylsiloxane and methacryloxysilane.

[0008] Furthermore, the viscosity of the α,ω-dihydroxypolydimethylsiloxane is in the range of 1000 to 1500 cps.

[0009] Furthermore, the methacryloxysilane is at least one of SCA-R75M, SCA-R74TM, SCA-R74P, SCA-R74F, SCA-R74T, SCA-R73M, SCA-R74E, and SCA-R74M produced by NAND.

[0010] Furthermore, the base resin is prepared by the following steps: 93 to 97 parts by weight of α, ω-dihydroxypolydimethylsiloxane and 3 to 5 parts by weight of methacryloxysilane are placed in a reaction container, 0.1 to 0.15 parts by weight of a catalyst are added, the temperature is raised to 65 to 70° C., the reaction is stirred for 5 to 6 hours, and reduced pressure distillation is performed to obtain the base resin.

[0011] Furthermore, the modified filler is prepared by the following steps: Dissolve TEOS in an appropriate amount of ethanol, add concentrated ammonia water, mix and stir evenly, continue to add an appropriate amount of distilled water, mix and stir evenly, add filler, and after stirring, let it stand at room temperature, filter, and obtain powder; The powder, the surface treatment agent and an appropriate amount of anhydrous ethanol are placed in a reaction container, the temperature is raised to 70-80° C., refluxed for 8-10 hours, filtered and dried to obtain a modified filler.

[0012] Furthermore, the filler is at least one of expanded vermiculite, expanded silicate, and hollow glass microspheres; the density of the filler is 0.5 to 0.7 g / cm 3 , the particle size D50 of the filler is 15 to 25 μm; The surface treatment agent is at least one of Siwin-F031, Siwin-F032, Siwin-F831, Siwin-F832, Siwin-F3121 and Siwin-F331 produced by Nanjing Silicon Innovation; The mass ratio of TEOS: concentrated ammonia water: distilled water: filler is 10-15:10-15:10-20:10-15; The mass ratio of the powder to the surface treatment agent is 30-35:3-5.

[0013] Furthermore, the acrylic acid monomer is at least one of HEA, HEMA, MAA, EA and BA produced by Shandong Chuangying Chemical.

[0014] Further, the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-4-(2-hydroxyethoxy)-2-methylphenyl propiotone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-propanone, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, 4-benzoyl-4'-methyl-diphenyl sulfide, 2-(4-methylbenzyl)-2-(dimethylamino) ...2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, 2-phenyl At least one of 1,1'-(methylenebis-4,1-phenylene)bis[2-hydroxy-2-methyl-1-propanone], 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-1-hexanophenone, bis-2,6-difluoro-3-pyrrolophenyl titanocene, methyl benzoylformate, benzophenone, 4-methylbenzophenone, 4-phenylbenzophenone, 4-chlorobenzophenone, methyl o-benzoylbenzoate, ethyl 4-dimethylaminobenzoate, isooctyl p-dimethylaminobenzoate, 4,4'-bis(diethylamino)benzophenone, isopropylthioxanthone, 2,4-diethylthioxanthone and 2-ethylanthraquinone.

[0015] Secondly, the present invention also provides a preparation method of the above-mentioned thin-coat wear-resistant super-hydrophobic conformal paint, which specifically includes: according to the raw material ratio, adding the base resin, modified filler, acrylic monomer and photoinitiator into a planetary mixer, stirring at a speed of 40 to 60 Hz for 90 to 120 minutes, and discharging.

[0016] The beneficial effects of the present invention are: The present invention treats the filler by a sol-gel method so that the filler itself has a micro-nano structure, and the filler is treated with a surface treatment agent to obtain a modified filler with extremely low surface energy. After the prepared modified filler is mixed with the matrix resin, it floats on the coating surface due to the density difference between the filler and the resin, providing a rough surface structure for the coating surface, and the modified filler has a lower surface energy, thereby reducing the surface energy of the super-hydrophobic coating. During the preparation of the modified filler, after the filler is treated by the sol-gel method, nano-silicon dioxide is attached to a micron-level low-density powder (such as expanded vermiculite, expanded silicate or hollow glass microspheres, etc.) to form a micro-nano structure powder. Since the wet film thickness of the super-hydrophobic three-proof paint in the present invention is controlled to be about 30 μm, the low-density powder brings the attached nano-silicon dioxide to the coating surface due to the density difference, forming a nano-coating, which is conducive to improving the protective effect. The present invention provides good adhesion and wear resistance for the super-hydrophobic conformal coating by using acrylic modified silicone as a base resin. By using the base resin, the influence of coating friction on the super-hydrophobic coating due to assembly, inspection, etc. during the use process can be avoided, thereby ensuring the protective effect of the product.

[0017] After the three-proof paint is cured, the water contact angle of the coating is as high as 165°. Using 100-grit sandpaper, with weights of 50g, 100g and 500g respectively, and rubbing repeatedly for 10 times, the water contact angle is still greater than 150°. The three-proof paint has good wear resistance and super hydrophobic properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : Water contact angle before wear resistance test of Example 6; Figure 2 : Water contact angle after wear test of Example 6 Figure 3 : Example 6, picture before salt spray test; Figure 4 : Example 6, pictures after salt spray test; Figure 5 : Example 6, picture after double 85 test; Figure 6 : Example 6, pictures after hot and cold shock test; Figure 7 : SEM image of Example 6 filler before modification; Figure 8 : SEM image of modified filler of Example 6; Fig. 9 : Picture of blank PCB board (without protection effect) after salt spray test. DETAILED DESCRIPTION

[0019] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0020] The reagents or instruments used in the present invention without indicating the manufacturer are all conventional products that can be purchased from the market.

[0021] Example 1 Step 1: At room temperature, add 100g of ethanol to a three-necked flask, add 21g of TEOS dropwise, stir at 50Hz for 10min, then add 20g of 25% ammonia dropwise, continue stirring for 10min, then add 30g of distilled water dropwise, continue stirring for 30min, add 21g of expanded vermiculite (density 0.53g / cm 3 , D50 15μm), stirred for 10min, allowed to stand at room temperature for 3d, and then filtered to obtain powder; Step 2: Take 20.79g of the above powder, 0.21g Siwin-F832 and 42g of anhydrous ethanol and place them in a three-necked flask, add room temperature water to condense and reflux, stir at 25Hz, reaction temperature: 78.5℃, stirring time: 8h. After the reaction is completed, filter while hot, bake the filtered powder at 100℃ for 4h to obtain a modified filler; Step 3: 95 g of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 1500 cps (Guangzhou Shengtainuo New Material Technology Co., Ltd.), 5 g of SCA-R74F, and 0.15 g of dibutyltin dilaurate were placed in a reaction container, and the residue was collected by vacuum distillation. The stirring speed was 30 Hz, the reaction temperature was 65°C, and the stirring time was 5 h to obtain a matrix resin; Step 4: Place 300g of base resin, 100g of modified filler, 75g of EA and 25g of bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide in a reaction container, stir at a speed of 40Hz, stir for 90min, and discharge to obtain a thin-coated wear-resistant super-hydrophobic conformal coating.

[0022] Example 2 Step 1: At room temperature, add 100g of ethanol to a three-necked flask, add 21g of TEOS dropwise, stir at 50Hz for 10min, then add 20g of 25% ammonia dropwise, continue stirring for 10min, then add 30g of distilled water dropwise, continue stirring for 30min, add 21g of hollow glass microspheres (density 0.6g / cm 3 , D50 15μm), stirred for 10min, allowed to stand at room temperature for 3d, and then filtered to obtain powder; Step 2: Take 20.79g of the above powder, 2.08g Siwin-F832 and 42g of anhydrous ethanol and place them in a three-necked flask, add room temperature water to condense and reflux, stir at 25Hz, reaction temperature: 78.5℃, stirring time: 8h. After the reaction is completed, filter while hot, bake the filtered powder at 100℃ for 4h to obtain a modified filler; Step 3: 95 g of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 1500 cps (Guangzhou Shengtainuo New Material Technology Co., Ltd.), 5 g of SCA-R74TM, and 0.1 g of dibutyltin dilaurate were placed in a reaction container, and vacuum distilled to collect the residue. The stirring speed was 35 Hz, the reaction temperature was 65° C., and the stirring time was 5 h to obtain a matrix resin; Step 4: Place 300g of base resin, 100g of modified filler, 75g of EA and 25g of 1-hydroxycyclohexyl phenyl ketone in a reaction container, stir at a speed of 40Hz, stir for 90min, and discharge to obtain a thin-coated wear-resistant super-hydrophobic conformal coating.

[0023] Example 3 Step 1: At room temperature, add 100g of ethanol to a three-necked flask, add 21g of TEOS dropwise, stir at 50Hz for 10min, then add 20g of 25% ammonia dropwise, continue stirring for 10min, then add 30g of distilled water dropwise, continue stirring for 30min, add 21g of expanded silicate (density 0.6g / cm 3 , D50 15μm), stirred for 10min, allowed to stand at room temperature for 3d, and then filtered to obtain powder; Step 2: Take the above 20.79g powder, 2.08g Siwin-F031 and 42g anhydrous ethanol and place them in a three-necked flask, add room temperature water to condense and reflux, stir at 25Hz, reaction temperature: 78.5℃, stirring time: 8h. After the reaction is completed, filter while hot, bake the filtered powder at 100℃ for 4h to obtain a modified filler; Step 3: 95 g of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 1500 cps (Guangzhou Shengtainuo New Material Technology Co., Ltd.), 5 g of SCA-R74F, and 0.1 g of dibutyltin dilaurate were placed in a reaction container, and vacuum distilled to collect the residue. The stirring speed was 35 Hz, the reaction temperature was 65, and the stirring time was 6 h to obtain a matrix resin; Step 4: Place 300g of base resin, 100g of modified filler, 75g of EA and 25g of 1-hydroxycyclohexyl phenyl ketone in a reaction container, stir at a speed of 40Hz, stir for 90min, and discharge to obtain a thin-coated wear-resistant super-hydrophobic conformal coating.

[0024] Example 4 Step 1: At room temperature, add 100g of ethanol to a three-necked flask, add 21g of TEOS dropwise, stir at 50Hz for 10min, then add 20g of 25% ammonia dropwise, continue stirring for 10min, then add 30g of distilled water dropwise, continue stirring for 30min, add 21g of expanded silicate (density 0.7g / cm 3 , D50 25μm), stirred for 10min, allowed to stand at room temperature for 3d, and then filtered to obtain powder; Step 2: Take 18.9g of the above powder, 1.89g of Siwin-F832 and 42g of anhydrous ethanol and place them in a three-necked flask, add room temperature water to condense and reflux, stir at 25Hz, reaction temperature: 78.5℃, stirring time: 8h. After the reaction is completed, filter while hot, bake the filtered powder at 100℃ for 4h to obtain a modified filler; Step 3: 96 g of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 1000 cps (Guangzhou Shengtainuo New Material Technology Co., Ltd.), 3 g of SCA-R74F, and 0.1 g of dibutyltin dilaurate were placed in a reaction container, and the mixture was distilled under reduced pressure, and the residue was collected. The stirring speed was 30 Hz, the reaction temperature was 65° C., and the stirring time was 6 h to obtain a matrix resin; Step 4: Place 300g of base resin, 100g of modified filler, 75g of EA and 25g of 1-hydroxycyclohexyl phenyl ketone in a reaction container, stir at a speed of 40Hz, stir for 90min, and discharge to obtain a thin-coated wear-resistant super-hydrophobic conformal coating.

[0025] Example 5 Step 1: At room temperature, add 100g of ethanol to a three-necked flask, add 21g of TEOS dropwise, stir at 50Hz for 10min, then add 20g of 25% ammonia dropwise, continue stirring for 10min, then add 30g of distilled water dropwise, continue stirring for 30min, add 21g of expanded silicate (density 0.7g / cm 3 , D50 25μm), stirred for 10min, allowed to stand at room temperature for 3d, and then filtered to obtain powder; Step 2: Take 19.95g of the above powder, 2g of Siwin-F832 and 42g of anhydrous ethanol and place them in a three-necked flask, add room temperature water to condense and reflux, stir at 25Hz, reaction temperature: 78.5℃, stirring time: 8h. After the reaction is completed, filter while hot, bake the filtered powder at 100℃ for 4h to obtain a modified filler; Step 3: 96 g of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 1000 cps (Guangzhou Shengtainuo New Material Technology Co., Ltd.), 3 g of SCA-R74F, and 0.1 g of dioctyltin were placed in a reaction container, and the residue was collected by vacuum distillation. The stirring speed was 35 Hz, the reaction temperature was 65°C, and the stirring time was 5 h to obtain a matrix resin; Step 4: Place 300g of base resin, 100g of modified filler, 75g of EA and 25g of 1-hydroxycyclohexyl phenyl ketone in a reaction container, stir at a speed of 50Hz, stir for 90min, and discharge to obtain a thin-coated wear-resistant super-hydrophobic conformal coating.

[0026] Example 6 Step 1: At room temperature, add 100g of ethanol to a three-necked flask, add 21g of TEOS dropwise, stir at 50Hz for 10min, then add 20g of 25% ammonia dropwise, continue stirring for 10min, then add 30g of distilled water dropwise, continue stirring for 30min, add 21g of hollow glass microspheres (density 0.7g / cm 3 , D50 25μm), stirred for 10min, allowed to stand at room temperature for 3d, and then filtered to obtain powder; Step 2: Take 19.95g of the above powder, 2g of Siwin-F832 and 42g of anhydrous ethanol and place them in a three-necked flask, add room temperature water to condense and reflux, stir at 25Hz, reaction temperature: 78.5℃, stirring time: 8h. After the reaction is completed, filter while hot, bake the filtered powder at 100℃ for 4h to obtain a modified filler; Step 3: 95 g of 1000 cps α,ω-dihydroxypolydimethylsiloxane (Guangzhou Shengtainuo New Material Technology Co., Ltd.), 5 g of SCA-R74F, and 0.1 g of dioctyltin were placed in a reaction container, and the residue was collected by vacuum distillation at a stirring speed of 35 Hz, a reaction temperature of 65°C, and a stirring time of 5 h to obtain a matrix resin; Step 4: Place 350g of base resin, 50g of modified filler, 0.15g of EA and 0.05g of 1-hydroxycyclohexyl phenyl ketone in a reaction container, stir at a speed of 50Hz, stir for 90min, and discharge to obtain a thin-coated wear-resistant super-hydrophobic conformal coating.

[0027] Example 7 Step 1: At room temperature, add 100g of ethanol to a three-necked flask, add 21g of TEOS dropwise, stir at 50Hz for 10 min, then add 20g of 25% ammonia dropwise, continue stirring for 10min, then add 30g of distilled water dropwise, continue stirring for 30min, add 21g of hollow glass microspheres (density 0.66g / cm 3, D50 25μm), stirred for 10min, allowed to stand at room temperature for 3d, and then filtered to obtain powder; Step 2: Take 19.95g of the above powder, 2g of Siwin-F832 and 42g of anhydrous ethanol and place them in a three-necked flask, add room temperature water to condense and reflux, stir at 25Hz, reaction temperature: 78.5℃, stirring time: 8h. After the reaction is completed, filter while hot, bake the filtered powder at 100℃ for 4h to obtain a modified filler; Step 3: 95 g of 1000 cps α,ω-dihydroxypolydimethylsiloxane (Guangzhou Shengtainuo New Material Technology Co., Ltd.), 5 g of SCA-R74F, and 0.1 g of dioctyltin were placed in a reaction container, and the residue was collected by vacuum distillation. The stirring speed was 30 Hz, the reaction temperature was 65°C, and the stirring time was 6 h to obtain a matrix resin; Step 4: Place 350g of base resin, 50g of modified filler, 50g of EA, 25g of HEA and 25g of 1-hydroxycyclohexyl phenyl ketone in a reaction container, stir at a speed of 55Hz, stir for 90min, and discharge to obtain a thin-coat wear-resistant super-hydrophobic conformal coating.

[0028] Example 8 Step 1: At room temperature, add 100g of ethanol to a three-necked flask, add 21g of TEOS dropwise, stir at 50Hz for 10min, add 20g of 25% ammonia dropwise, continue stirring for 10min, then add 30g of distilled water dropwise, continue stirring for 30min, add 21g of hollow glass microspheres (density 0.66g / cm 3 , D50 25μm), stirred for 10min, allowed to stand at room temperature for 3d, and then filtered to obtain powder; Step 2: Take 19.95g of the above powder, 2g of Siwin-F832 and 42g of anhydrous ethanol and place them in a three-necked flask, add room temperature water for condensation and reflux, stir at 25Hz, reaction temperature: 78.5℃, stirring time: 8h. After the reaction is completed, filter while hot, bake the filtered powder at 100℃ for 4h to obtain a modified filler; Step 3: 95 g of 1000 cps α,ω-dihydroxypolydimethylsiloxane (Guangzhou Shengtainuo New Material Technology Co., Ltd.), 5 g of SCA-R74F, and 0.1 g of dibutyltin dilaurate were placed in a reaction container, and the residue was collected by vacuum distillation. The stirring speed was 30 Hz, the reaction temperature was 65°C, and the stirring time was 6 h to obtain a matrix resin; Step 4: Place 350g of base resin, 50g of modified filler, 75g of HEA and 25g of 1-hydroxycyclohexyl phenyl ketone in a reaction container, stir at a speed of 60Hz, stir for 100min, and discharge to obtain a thin-coated wear-resistant super-hydrophobic conformal coating.

[0029] The hydrophobicity test was performed on the three-conformal coatings prepared in Examples 1 to 8. The test results are shown in Table 1: Table 1

[0030] Note: Water contact angle test standard GB / T 30693-2014; test conditions: wet film thickness 30μm, stand at room temperature for 30min, UV cure, stand at room temperature for 72h before testing. Test the water contact angle before rubbing, then use 100-grit sandpaper, load 50g, 100g and 500g respectively, rub repeatedly 10 times, and test the water contact angle again.

[0031] The three-conformal coatings prepared in Examples 1 to 8 were subjected to protection tests, and the test results are shown in Table 2: Table 2

[0032] Note: Salt spray test standard: IEC68-2-11; Thermal shock test standard: -40℃~125℃, 100 cycles; Double 85 test standard: 1000h under the conditions of temperature 85℃ and humidity 85%; Test conditions: wet film thickness 30μm, stand at room temperature for 30min, UV cure, stand at room temperature for 72h before testing.

[0033] According to the disclosure of the above description, those skilled in the art to which the present invention belongs may also make appropriate changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A thin-coat wear-resistant super-hydrophobic conformal paint, characterized by: By weight, it includes the following raw material components: 60-70 parts of base resin, 10-20 parts of modified filler, 10-15 parts of acrylic acid monomer, 4 to 6 parts of photoinitiator.

2. The thin-coat wear-resistant super-hydrophobic conformal coating according to claim 1, characterized in that: The base resin is made of α,ω-dihydroxy polydimethylsiloxane and methacryloxy silane.

3. The thin-coat wear-resistant super-hydrophobic conformal coating according to claim 2, characterized in that: The viscosity of the α,ω-dihydroxy polydimethylsiloxane is in the range of 1000 to 1500 cps.

4. The thin-coat wear-resistant super-hydrophobic conformal coating according to claim 2, characterized in that: The methacryloxysilane is at least one of SCA-R75M, SCA-R74TM, SCA-R74P, SCA-R74F, SCA-R74T, SCA-R73M, SCA-R74E, and SCA-R74M produced by Noble.

5. The thin-coat wear-resistant super-hydrophobic conformal coating according to claim 2, characterized in that: The base resin is prepared by the following steps: 93 to 97 parts by weight of α,ω-dihydroxypolydimethylsiloxane and 3 to 5 parts by weight of methacryloxysilane are placed in a reaction container, 0.1 to 0.15 parts by weight of a catalyst are added, the temperature is raised to 65 to 70° C., the reaction is stirred for 5 to 6 hours, and the base resin is obtained by reduced pressure distillation.

6. The thin-coat wear-resistant super-hydrophobic conformal coating according to claim 1, characterized in that: The modified filler is prepared by the following steps: Dissolve TEOS in an appropriate amount of ethanol, add concentrated ammonia water, mix and stir evenly, continue to add an appropriate amount of distilled water, mix and stir evenly, add filler, and after stirring, let it stand at room temperature, filter, and obtain powder; The powder, the surface treatment agent and an appropriate amount of anhydrous ethanol are placed in a reaction container, the temperature is raised to 70-80° C., refluxed for 8-10 hours, filtered and dried to obtain a modified filler.

7. The thin-coat wear-resistant super-hydrophobic conformal coating according to claim 6, characterized in that: The filler is at least one of expanded vermiculite, expanded silicate, and hollow glass microspheres; the density of the filler is 0.5-0.7 g / cm 3 , the particle size D50 of the filler is 15 to 25 μm; The surface treatment agent is at least one of Siwin-F031, Siwin-F032, Siwin-F831, Siwin-F832, Siwin-F3121 and Siwin-F331 produced by Nanjing Silicon Innovation; The mass ratio of TEOS: concentrated ammonia water: distilled water: filler is 10-15:10-15:10-20:10-15; The mass ratio of the powder to the surface treatment agent is 30-35:3-5.

8. The thin-coat wear-resistant super-hydrophobic conformal coating according to claim 1, characterized in that: The acrylic acid monomer is at least one of HEA, HEMA, MAA, EA and BA produced by Shandong Chuangying Chemical.

9. The thin-coat wear-resistant super-hydrophobic conformal coating according to claim 1, characterized in that: The photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-4-(2-hydroxyethoxy)-2-methylphenyl propiotone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-propanone, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinylbenzylphenyl)butanone, 4-benzoyl-4'-methyl-diphenyl sulfide, 2-(4-methylbenzyl)-2-(dimethylamino)- At least one of 1-(4-morpholinophenyl)-1-butanone, 1,1'-(methylenebis-4,1-phenylene)bis[2-hydroxy-2-methyl-1-propanone], 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-1-hexanophenone, bis-2,6-difluoro-3-pyrrolophenyl titanocene, methyl benzoylformate, benzophenone, 4-methylbenzophenone, 4-phenylbenzophenone, 4-chlorobenzophenone, methyl o-benzoylbenzoate, ethyl 4-dimethylaminobenzoate, isooctyl p-dimethylaminobenzoate, 4,4'-bis(diethylamino)benzophenone, isopropylthioxanthone, 2,4-diethylthioxanthone and 2-ethylanthraquinone.

10. A method for preparing a thin-coat wear-resistant super-hydrophobic conformal coating according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: adding base resin, modified filler, acrylic monomer and photoinitiator into a planetary mixer according to the raw material ratio, stirring at a speed of 40 to 60 Hz for 90 to 120 minutes, and discharging the materials.

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