Insulator surface super-hydrophobic treatment process

Abstract

The present application relates to the technical field of sub surface treatment, and particularly relates to an insulator surface super-hydrophobic treatment process, comprising the following steps: S1, dust removal treatment is performed on the insulator surface by compressed air, and then non-woven fabric or gauze is used for wiping; S2, the prepared super-hydrophobic primer is loaded into a spray gun to uniformly spray the insulator surface; S3, the insulator after the treatment of step S2 is semi-cured; S4, the super-hydrophobic surface coating is loaded into a spray gun to uniformly spray the insulator surface, and the super-hydrophobic coating is formed after the spray coating is cured. The present application can form a super-hydrophobic micro-nano structure on the outer surface of the insulator, which can adsorb an air film pad like a "lotus leaf", so that dust, salt particles, fog particles and the like cannot be attached to the insulator surface. The dirt on the surface can be carried away by the airflow caused by natural wind or high-speed locomotives, effectively solving the problem of dirt accumulation in complex cross-sea type dirty environments, reducing operation and maintenance costs, and ensuring the safe operation of the locomotive.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sub surface treatment, in particular to an insulator surface super-hydrophobic treatment process. BACKGROUND

[0002] The silicon rubber insulator is widely used in the power transmission line of the current power system, which is used for line electrical insulation and mechanical support, and is of great significance to the normal transmission of electric energy. The standard composite insulator for railway has excellent anti-pollution flashover performance and self-cleaning performance due to the excellent low surface energy of the silicon rubber material. Different levels of polluted areas have different requirements for the creepage distance of the insulator outer insulation. Although the existing anti-pollution composite insulator has an insulation distance of 1600mm, which is as high as 58mm / kV in the high-speed rail catenary, which is much higher than the standard requirement, it meets the application environment of most parts, but in a few complex cross-sea type pollution environments, the existing product has defects. The semi-open environment makes the insulator unable to be washed by rain, and the position less than 10m from the sea level is located in a high-humidity and high-salt pollution environment, and the surface salt pollution accumulates at a very fast speed. If not cleaned in time, partial discharge may occur, which may affect the service life of the insulator and even cause tripping.

[0003] The conventional anti-pollution means is to clean the surface of the insulator regularly, but this high-altitude or live work is high in cost and low in efficiency. Therefore, how to maintain the anti-pollution performance of the insulator surface for a long time has attracted more and more attention. SUMMARY

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present application is to provide an insulator surface super-hydrophobic treatment process, which is simple in operation, convenient to control and high in production efficiency. The super-hydrophobic micro-nano structure formed on the outer surface of the insulator can absorb an air film pad like a "lotus leaf", so that dust, salt particles, fog particles and the like cannot adhere to the surface of the insulator. In the application site, the pollution on the surface can be carried away by the airflow brought by natural wind or high-speed locomotive, effectively solving the problem of pollution accumulation in complex cross-sea type pollution environment, reducing the operation and maintenance pressure, reducing the operation and maintenance cost, and ensuring the safe operation of the locomotive.

[0005] The purpose of the present application is achieved by the following technical scheme: an insulator surface super-hydrophobic treatment process, comprising the following steps:

[0006] S1, dust and oil removal: compressed air is used to remove dust from the surface of the insulator. When the air humidity is greater than 60%, the compressed air needs to be dehumidified before use. After dust removal, non-woven fabric or gauze soaked with solvent is used to wipe the insulator, and the dust and residual grease on the surface of the insulator are wiped off, and the insulator is ready for use;

[0007] S2, spraying: the prepared super-hydrophobic primer is loaded into a spray gun to uniformly spray the surface of the insulator, and the insulator is ready for use;

[0008] S3, semi-solidification: the insulator treated in step S2 is placed in a condition with a temperature of 20-40℃ for semi-solidification treatment for 8-16min, standby, wherein the solidification time can be appropriately prolonged according to the room temperature;

[0009] S4, the super-hydrophobic surface paint is loaded into a spray gun to uniformly spray the surface of the insulator treated in step S3, and after the spraying is completed, it is left to solidify for 40-60h to form a super-hydrophobic coating, and finally the super-hydrophobic treatment of the surface of the insulator is completed.

[0010] The treatment process in the application is simple in operation, convenient to control, and high in production efficiency. By forming a super-hydrophobic micro-nano structure on the outer surface of the insulator, an air film pad can be adsorbed like a "lotus leaf", so that dust, salt particles, fog particles and the like cannot adhere to the surface of the insulator. In the application site, the surface dirt can be carried away by the airflow brought by natural wind or high-speed locomotive, effectively solving the problems of dirt accumulation in complex cross-sea type dirty environments, reducing the operation and maintenance pressure, reducing the operation and maintenance cost, and ensuring the safe operation of the locomotive. After step S2, the super-hydrophobic primer paint needs to be sprayed within 4h, and the super-hydrophobic primer paint needs to be used up within 120min after being prepared. The paint contains volatile components, and the spraying site requires good ventilation and exhaust facilities to ensure good air circulation. In addition, in order to ensure the surface quality of the coating, the spraying site requires no dust, and the spraying site needs to be cleaned before spraying. During spraying, the spraying site requires good lighting, stable power supply, and pressure-stable gas source.

[0011] Preferably, in step S2, the outlet pressure of the spray gun is 0.4-0.8MPa, the distance between the spray gun and the surface of the insulator is controlled to be 150-250mm, the spray gun is kept perpendicular to the surface of the insulator during spraying, the running speed of the spray gun is 1-3m / min, and the liquid flow amount is adjusted to ensure that there is no liquid accumulation on the spraying surface during spraying; after the super-hydrophobic primer paint is sprayed, the thickness is maintained at 30-80μm.

[0012] In the application, by controlling the above parameters, the paint can be effectively and uniformly sprayed, thereby ensuring that the coating obtained by final spraying can effectively protect the internal insulator from dirt accumulation.

[0013] Preferably, in step S1, the solvent is at least one of deionized water and anhydrous ethanol.

[0014] Preferably, in step S2, the super-hydrophobic primer paint is a mixture composed of a curing agent, an acrylic resin and modified nano-SiO2 in a weight ratio of 2:0.8-1.6:1.0-1.4.

[0015] Preferably, the curing agent, acrylic resin and modified nano-SiO2 are added into a reaction device in a weight ratio, mixed and stirred for 5-20 min, and then aged for 5-10 min after uniform stirring, and can be used for spraying.

[0016] In the present application, the modified nano-SiO2 is used as the main body to form the super-hydrophobic primer, and the nano-structure is easy to obtain, rich in types, fast to prepare, controllable in morphology and thickness, and the prepared super-hydrophobic primer has a water static contact angle higher than 170° and a water rolling angle lower than 2°, has extremely low adhesion to water, and even has super-oil-repellent properties to some oil liquids, and shows good self-cleaning properties, so that dust, salt particles, fog particles and the like cannot be attached to the surface of the insulator, and the surface dirt can be carried away by the airflow brought by natural wind or high-speed vehicles in the application site, and the problems of dirt accumulation in a complex cross-sea type dirty environment and the like are effectively solved.

[0017] Preferably, the modified nano-SiO2 comprises the following raw materials in a weight ratio: nano-SiO2 20-40 parts, silane coupling agent 1-5 parts, ethanol 10-20 parts, sodium dodecyl sulfate 5-10 parts, N,N-dimethylformamide 4-8 parts, and dibutyltin dilaurate 0.5-1.0 parts.

[0018] The silane coupling agent is at least one of vinyltriethoxysilane, KH560 silane coupling agent, vinyltriethoxysilane, and 3-mercaptopropyltrimethoxysilane.

[0019] Preferably, the modified nano-SiO2 is prepared by the following steps:

[0020] 1) According to a weight ratio, nano-SiO2 and a silane coupling agent are added into ethanol, ultrasonic treatment is carried out at 40-50℃ for 1-2h, the ultrasonic frequency is 10-20KHz, then the mixture is placed in a constant-temperature water bath and heated to 50-60℃, and uniform stirring is carried out for 2-4h to obtain a mixture for standby use;

[0021] 2) According to a weight ratio, sodium dodecyl sulfate, N,N-dimethylformamide and dibutyltin dilaurate are added into the mixture obtained in step 1), then heating is carried out to 60-70℃, and stirring is carried out until the reaction is complete, then the reaction product is washed, filtered and dried to obtain the modified nano-SiO2.

[0022] In the present application, the modified nano-SiO2 is grafted under the catalysis of dibutyltin dilaurate by using a silane coupling agent and N,N-dimethylformamide, and then the modified acrylic resin is modified, the alkenyl group in the silane coupling agent is crosslinked and polymerized with the acrylic acid, the dispersibility of the modified nano-SiO2 in the acrylic resin is improved, the modified nano-SiO2 as inorganic nano-materials can obviously enhance the mechanical properties such as wear resistance and tensile strength of the coating film material, and the shortcomings of using organic silicon alone are overcome.

[0023] Preferably, the curing agent is a mixed curing agent composed of modified isocyanate, titanium tetraisopropoxide and benzoyl peroxide; more preferably, the curing agent is a mixed curing agent composed of modified isocyanate, titanium tetraisopropoxide and benzoyl peroxide in a weight ratio of 0.8-1.2:0.4-0.8:0.6-1.0.

[0024] The modified isocyanate is prepared by the following method: taking 20-30 parts of polyisocyanate, 15-25 parts of ethyl acetate, 0.5-1.0 parts of stannous octoate, and 5-10 parts of bisaminopropyl silicone oil; the polyisocyanate and ethyl acetate are added into a reaction device and dissolved uniformly under stirring in an inert atmosphere, then the stannous octoate is added, the temperature is controlled at 3-8℃, the bisaminopropyl silicone oil is added, and after 2-6h of incubation, the temperature is raised to room temperature for discharge, to obtain the modified isocyanate.

[0025] The above specific types of curing agents are used in the curing agent of the present application and have good curing effect when the coating is formed; the curing agent can be crosslinked with the hydroxyl-containing acrylic resin to obtain a low-surface-energy coating, which can improve the hydrophobicity and stain resistance of the coating. The organic silicon used in the modified isocyanate is used to modify the isocyanate with less organic silicon raw materials, and the coating obtained after curing and film formation can reach the surface energy of the organic silicon resin after curing and film formation.

[0026] Preferably, in step S4, the super-hydrophobic surface coating is sprayed continuously for 3-5 times, and the spraying thickness is controlled to be 5-20μm per time, and the interval between each spraying is 3-8min.

[0027] Preferably, in step S4, the super-hydrophobic surface coating is a polyurethane diluent.

[0028] The present application has the advantages of simple operation, convenient control, high production efficiency, and the formation of a super-hydrophobic micro-nano structure on the outer surface of the insulator can adsorb an air film pad like a "lotus leaf", so that dust, salt particles, fog particles and the like cannot adhere to the surface of the insulator, the airflow brought by natural wind or high-speed locomotive can carry away the surface dirt in the application site, effectively solving the problems of dirt accumulation in complex cross-sea type dirty environments, reducing the operation and maintenance pressure, reducing the operation and maintenance cost, and ensuring the safe operation of the locomotive. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the SEM image of the super-hydrophobic coating surface of the present application. DETAILED DESCRIPTION

[0030] For the convenience of those skilled in the art, the following embodiments and drawings are combined to facilitate understanding. Figure 1 The present application is further described, and the content mentioned in the embodiments is not a limitation of the present application.

[0031] Embodiment 1

[0032] An insulator surface super-hydrophobic treatment process, comprising the following steps:

[0033] S1, dust and oil removal: compressed air is used to remove dust from the surface of the insulator, and the compressed air needs to be dehumidified when the air humidity is greater than 60%; after dust removal, non-woven fabric or gauze soaked with solvent is used to wipe the insulator, and the surface of the insulator is cleaned of dust and residual oil, and then it is ready for use;

[0034] S2, spraying: the prepared super-hydrophobic primer is loaded into a spray gun to uniformly spray the surface of the insulator, and it is ready for use;

[0035] S3, semi-curing: the insulator treated in step S2 is placed in a temperature of 20℃ for semi-curing treatment for 8min, and it is ready for use;

[0036] S4, the super-hydrophobic surface coating is loaded into a spray gun to uniformly spray the surface of the insulator treated in step S3, and after spraying, it is left to solidify for 40h to form a super-hydrophobic coating, and finally the super-hydrophobic treatment of the surface of the insulator is completed.

[0037] In step S1, the solvent is deionized water.

[0038] In step S2, the outlet pressure of the spray gun is 0.4MPa, the distance between the spray gun and the surface of the insulator is controlled to be 150mm, and the running speed of the spray gun is 1m / min; after the super-hydrophobic primer is sprayed, the thickness is kept at 30μm.

[0039] In step S4, the super-hydrophobic surface coating is sprayed for 3 times, and the spraying thickness is controlled to be 5μm per time, and the interval between each spraying is 3min; the super-hydrophobic surface coating is polyurethane diluent, and the polyurethane diluent used is produced by Jining Hongye Chemical Co., Ltd.

[0040] In step S2, the super-hydrophobic primer is a mixture of a curing agent, an acrylic resin and modified nano-SiO2 in a weight ratio of 2:0.8:1.0.

[0041] The curing agent, the acrylic resin and the modified nano-SiO2 are added to a reaction device in a weight ratio and mixed and stirred for 5min, and after uniform stirring, it is aged for 5min, and then it can be used for spraying.

[0042] The modified nano-SiO2 comprises the following raw materials in parts by weight: nano-SiO2 20 parts, silane coupling agent 1 part, ethanol 10 parts, sodium dodecyl sulfate 5 parts, N,N-dimethylformamide 4 parts, and dibutyltin dilaurate 0.5 parts.

[0043] The modified nano-SiO2 is prepared by the following steps:

[0044] 1) According to the weight ratio, nano-SiO2 and silane coupling agent are added into ethanol, ultrasonic treatment is carried out at 40℃ for 1h, the ultrasonic frequency is 10KHz, then it is placed in a constant temperature water bath and heated to 50℃, uniform stirring is carried out for 2h, a mixture is obtained, and it is ready for use;

[0045] 2) According to the weight ratio, sodium dodecyl sulfate, N,N-dimethylformamide and dibutyltin dilaurate are added into the mixture obtained in step 1), then it is heated to 60℃ and stirred until the reaction is completed, the obtained reaction product is washed, filtered and dried, and the modified nano-SiO2 is obtained.

[0046] The silane coupling agent is vinyltriethoxysilane.

[0047] The curing agent is a mixed curing agent composed of modified isocyanate, titanium tetraisopropoxide and benzoyl peroxide according to the weight ratio of 0.8:0.4:0.6.

[0048] The modified isocyanate is prepared by the following method: 20 parts of polyisocyanate, 15 parts of ethyl acetate, 0.5 parts of stannous octoate and 5 parts of bisaminopropyl silicone oil are taken for use; the polyisocyanate and ethyl acetate are added into a reaction device and stirred to dissolve uniformly in an inert atmosphere, then the stannous octoate is added, the temperature is controlled at 3℃, the bisaminopropyl silicone oil is added, the temperature is kept for 2h and then increased to room temperature for discharging, and the modified isocyanate is obtained.

[0049] Example 2

[0050] An insulator surface super-hydrophobic treatment process, comprising the following steps:

[0051] S1, dust and oil removal: compressed air is used to remove dust from the surface of the insulator, when the air humidity is greater than 60%, the compressed air needs to be dehumidified before use, after dust removal, non-woven fabric or gauze soaked with solvent is used to wipe the insulator, and the surface of the insulator is wiped clean of dust and residual grease, and it is ready for use;

[0052] S2, spraying: the prepared super-hydrophobic primer is loaded into a spray gun to uniformly spray the surface of the insulator, and it is ready for use;

[0053] S3, semi-curing: the insulator treated in step S2 is placed in a temperature of 25℃ for semi-curing treatment for 10min, and it is ready for use;

[0054] S4, the super-hydrophobic topcoat is loaded into a spray gun to uniformly spray the surface of the insulator treated in step S3, and after the spraying is completed, it is left to solidify for 45h to form a super-hydrophobic coating, and the super-hydrophobic treatment of the surface of the insulator is finally completed.

[0055] In step S1, the solvent is anhydrous ethanol.

[0056] In step S2, the outlet pressure of the spray gun is 0.5 MPa, the distance between the spray gun and the surface of the insulator is controlled to be 170 mm, and the running speed of the spray gun is 1.5 m / min; after the super-hydrophobic base coating is sprayed, the thickness is kept to be 42 μm.

[0057] In step S4, the super-hydrophobic surface coating is sprayed continuously for 3 times, the spraying thickness is controlled to be 10 μm per time, and the interval between each spraying is 5 min; the super-hydrophobic surface coating is a polyurethane diluent, and the polyurethane diluent used is produced by Jining Hongye Chemical Co., Ltd.

[0058] In step S2, the super-hydrophobic base coating is a mixture composed of a curing agent, an acrylic resin and modified nano-SiO2 according to a weight ratio of 2:1.0:1.1.

[0059] The curing agent, the acrylic resin and the modified nano-SiO2 are added into a reaction device according to the weight ratio, mixed and stirred for 10 min, aged for 6 min after being uniformly stirred, and then can be used for spraying.

[0060] The modified nano-SiO2 includes the following raw materials in parts by weight: nano-SiO2 25 parts, silane coupling agent 2 parts, ethanol 13 parts, sodium dodecyl sulfate 5 parts, N,N-dimethylformamide 5 parts, and dibutyltin dilaurate 0.6 parts.

[0061] The modified nano-SiO2 is prepared by the following steps:

[0062] 1) According to the weight ratio, nano-SiO2 and silane coupling agent are added into ethanol, ultrasonic treatment is carried out at 43℃ for 1.3 h, the ultrasonic frequency is 13 KHz, then it is placed in a constant temperature water bath and heated to 53℃, and uniformly stirred for 2.5 h to obtain a mixture, which is ready for use;

[0063] 2) According to the weight ratio, sodium dodecyl sulfate, N,N-dimethylformamide and dibutyltin dilaurate are added into the mixture obtained in step 1), then heated to 63℃ and stirred until the reaction is complete, and the reaction product is washed, filtered and dried to obtain the modified nano-SiO2.

[0064] The silane coupling agent is KH560 silane coupling agent.

[0065] The curing agent is a mixed curing agent composed of modified isocyanate, titanium tetraisopropoxide and benzoyl peroxide according to a weight ratio of 0.9:0.5:0.7.

[0066] The modified isocyanate is prepared by the following method: taking polyisocyanate 23 parts, ethyl acetate 18 parts, stannous octoate 0.6 parts, bisaminopropyl silicone oil 6 parts for standby; the polyisocyanate and ethyl acetate are added into a reaction device, and are dissolved uniformly under stirring in an inert atmosphere, then stannous octoate is added, the temperature is controlled at 5℃, bisaminopropyl silicone oil is added, and after 3h of incubation, the temperature is raised to room temperature for discharge, to obtain the modified isocyanate.

[0067] Example 3

[0068] An insulator surface super-hydrophobic treatment process, comprising the following steps:

[0069] S1, dust and oil removal: compressed air is used to remove dust from the surface of the insulator; when the air humidity is greater than 60%, the compressed air needs to be dehumidified before use; after dust removal, non-woven fabric or gauze soaked with solvent is used to wipe the insulator, and the surface of the insulator is wiped clean of dust and residual grease, and is ready for use;

[0070] S2, spraying: the prepared super-hydrophobic primer is loaded into a spray gun to uniformly spray the surface of the insulator, and is ready for use;

[0071] S3, semi-curing: the insulator treated in step S2 is placed in a temperature of 30℃ for semi-curing treatment for 12min, and is ready for use;

[0072] S4, the super-hydrophobic surface coating is loaded into a spray gun to uniformly spray the surface of the insulator treated in step S3, and after spraying is completed, it is left to solidify for 50h to form a super-hydrophobic coating, and finally the super-hydrophobic treatment of the surface of the insulator is completed.

[0073] In step S1, the solvent is anhydrous ethanol.

[0074] In step S2, the outlet pressure of the spray gun is 0.6MPa, the distance between the spray gun and the surface of the insulator is controlled at 200mm, and the running rate of the spray gun is 2m / min; after the super-hydrophobic primer is sprayed, the thickness is maintained at 55μm.

[0075] In step S4, the super-hydrophobic surface coating is sprayed continuously for 4 times, the spraying thickness is controlled at 15μm per time, and the interval between each spraying is 6min; the super-hydrophobic surface coating is a polyurethane diluent produced by Jining Hongye Chemical Co., Ltd.

[0076] In step S2, the super-hydrophobic primer is a mixture of a curing agent, an acrylic resin and modified nano-SiO2 in a weight ratio of 2:1.0:1.2.

[0077] The curing agent, the acrylic resin and the modified nano-SiO2 are added into a reaction device in a weight ratio and mixed and stirred for 15min, and after uniform stirring, it is aged for 7min, and can be used for spraying.

[0078] The modified nano-SiO2 comprises the following raw materials by weight: nano-SiO2 30 parts, silane coupling agent 3 parts, ethanol 15 parts, sodium dodecyl sulfate 15 parts, N,N-dimethylformamide 6 parts, dibutyltin dilaurate 0.8 parts.

[0079] The modified nano-SiO2 is prepared by the following steps:

[0080] 1) According to the weight ratio, nano-SiO2 and silane coupling agent are added to ethanol, ultrasonic treatment is carried out at 45℃ for 1.5h, the ultrasonic frequency is 15KHz, then it is placed in a constant temperature water bath and heated to 55℃, uniform stirring is carried out for 3h, a mixture is obtained, and it is ready for use;

[0081] 2) According to the weight ratio, sodium dodecyl sulfate, N,N-dimethylformamide and dibutyltin dilaurate are added to the mixture obtained in step 1), then it is heated to 65℃ and stirred until the reaction is complete, the reaction product is washed, filtered and dried, and the modified nano-SiO2 is obtained.

[0082] The silane coupling agent is vinyltriethoxysilane.

[0083] The curing agent is a mixed curing agent composed of modified isocyanate, titanium tetraisopropoxide and benzoyl peroxide according to the weight ratio of 1.0:0.6:0.8.

[0084] The modified isocyanate is prepared by the following method: polyisocyanate 25 parts, ethyl acetate 20 parts, stannous octoate 0.7 parts, bisaminopropyl silicone oil 7 parts are prepared; polyisocyanate and ethyl acetate are added to a reaction device, and are dissolved uniformly under stirring in an inert atmosphere, then stannous octoate is added, the temperature is controlled at 6℃, bisaminopropyl silicone oil is added, the temperature is kept for 4h, then it is raised to room temperature and discharged, and the modified isocyanate is obtained.

[0085] Example 4

[0086] An insulator surface super-hydrophobic treatment process, comprising the following steps:

[0087] S1, dust and oil removal: compressed air is used to remove dust from the surface of the insulator, when the air humidity is greater than 60%, the compressed air needs to be dehumidified before use, after dust removal, non-woven fabric or gauze soaked with solvent is used to wipe the insulator, and the surface of the insulator is wiped clean of dust and residual grease, and it is ready for use;

[0088] S2, spraying: the prepared super-hydrophobic primer is loaded into a spray gun, and the surface of the insulator is uniformly sprayed, and it is ready for use;

[0089] S3, Semi-solidification: the insulator after step S2 is placed in the condition of 35℃ for 14 minutes, and is used for semi-solidification treatment;

[0090] S4, the super-hydrophobic surface coating is filled into the spray gun, and the surface of the insulator after step S3 is uniformly sprayed, and the super-hydrophobic coating is formed after the spray is completed and is placed for 55 hours, and the super-hydrophobic treatment of the surface of the insulator is finally completed.

[0091] In step S1, the solvent is anhydrous ethanol.

[0092] In step S2, the outlet pressure of the spray gun is 0.7MPa, the distance between the spray gun and the surface of the insulator is controlled to be 225mm, and the running speed of the spray gun is 2.5m / min; after the super-hydrophobic primer coating is sprayed, the thickness is kept to be 67μm.

[0093] In step S4, the super-hydrophobic surface coating is continuously sprayed for 4 times, the spraying thickness is controlled to be 18μm per time, and the interval between each spraying is 7 minutes; the super-hydrophobic surface coating is polyurethane diluent, and the polyurethane diluent is produced by Jining Hongye Chemical Co., Ltd.

[0094] In step S2, the super-hydrophobic primer coating is a mixture of a curing agent, an acrylic resin and modified nano-SiO2 in a weight ratio of 2:1.5:1.3.

[0095] The curing agent, the acrylic resin and the modified nano-SiO2 are added into a reaction device in a weight ratio, mixed and stirred for 18 minutes, aged for 9 minutes after uniform stirring, and can be used for spraying.

[0096] The modified nano-SiO2 includes the following raw materials in weight parts: nano-SiO2 35 parts, silane coupling agent 4 parts, ethanol 18 parts, sodium dodecyl sulfate 7 parts, N,N-dimethylformamide 7 parts, and dibutyltin dilaurate 0.9 parts.

[0097] The modified nano-SiO2 is prepared by the following steps:

[0098] 1) According to the weight ratio, nano-SiO2 and silane coupling agent are added to ethanol, ultrasonic treatment is carried out at 48℃ for 1.8h, the ultrasonic frequency is 18KHz, then it is placed in a constant temperature water bath and heated to 58℃, and uniform stirring is carried out for 3.5h, a mixture is obtained, and is used for standby;

[0099] 2) According to the weight ratio, sodium dodecyl sulfate, N,N-dimethylformamide and dibutyltin dilaurate are added to the mixture obtained in step 1), then heating to 68℃ is carried out, stirring reaction is carried out until it is complete, the reaction product is washed, filtered and dried, and the modified nano-SiO2 is obtained.

[0100] The silane coupling agent is 3-mercaptopropyl trimethoxysilane.

[0101] The curing agent is a mixed curing agent composed of modified isocyanate, titanium tetraisopropoxide and benzoyl peroxide in a weight ratio of 1.1:0.7:0.9.

[0102] The modified isocyanate is prepared by the following method: taking 28 parts of polyisocyanate, 23 parts of ethyl acetate, 0.8 parts of stannous octoate and 8 parts of bisaminopropyl silicone oil for standby; the polyisocyanate and ethyl acetate are added into a reaction device and dissolved uniformly under stirring in an inert atmosphere, then stannous octoate is added, the temperature is controlled at 7℃, bisaminopropyl silicone oil is added, and after 5h of incubation, the temperature is raised to room temperature for discharge, to obtain the modified isocyanate.

[0103] Example 5

[0104] An insulator surface super-hydrophobic treatment process, comprising the following steps:

[0105] S1, dust and oil removal: compressed air is used to remove dust from the surface of the insulator; when the air humidity is greater than 60%, the compressed air needs to be dehumidified before use; after dust removal, non-woven fabric or gauze soaked with solvent is used to wipe the insulator, and the surface of the insulator is wiped clean of dust and residual grease, and then it is ready for use;

[0106] S2, spraying: the prepared super-hydrophobic primer is loaded into a spray gun to uniformly spray the surface of the insulator, and then it is ready for use;

[0107] S3, semi-curing: the insulator treated in step S2 is placed in a semi-curing treatment at a temperature of 40℃ for 16min, and then it is ready for use;

[0108] S4, the super-hydrophobic topcoat is loaded into a spray gun to uniformly spray the surface of the insulator treated in step S3; after spraying, it is left to solidify for 60h to form a super-hydrophobic coating, and finally the super-hydrophobic treatment of the surface of the insulator is completed.

[0109] In step S1, the solvent is anhydrous ethanol.

[0110] In step S2, the outlet pressure of the spray gun is 0.8MPa, the distance between the spray gun and the surface of the insulator is controlled at 250mm, and the running speed of the spray gun is 3m / min; after the super-hydrophobic primer is sprayed, the thickness is kept at 80μm.

[0111] In step S4, the super-hydrophobic topcoat is sprayed for 5 times, and the spraying thickness is controlled at 20μm per time, and the interval between each spraying is 8min; the super-hydrophobic topcoat is a polyurethane diluent produced by Jining Hongye Chemical Co., Ltd.

[0112] In step S2, the super-hydrophobic primer is a mixture of a curing agent, an acrylic resin and modified nano-SiO2 in a weight ratio of 2:1.6:1.4.

[0113] The curing agent, the acrylic resin and the modified nano-SiO2 are added into a reaction device in a weight ratio and stirred for 20 min, and then aged for 10 min after uniform stirring, and then used for spraying.

[0114] The modified nano-SiO2 comprises the following raw materials in a weight ratio: nano-SiO240 parts, silane coupling agent 5 parts, ethanol 20 parts, sodium dodecyl sulfate 10 parts, N,N-dimethylformamide 8 parts, and dibutyltin dilaurate 1.0 part.

[0115] The modified nano-SiO2 is prepared by the following steps:

[0116] 1) The nano-SiO2 and the silane coupling agent are added into ethanol in a weight ratio, ultrasonically treated at 50℃ for 2h at a frequency of 20KHz, and then heated to 60℃ in a constant-temperature water bath and uniformly stirred for 4h to obtain a mixture, which is ready for use;

[0117] 2) The sodium dodecyl sulfate, the N,N-dimethylformamide and the dibutyltin dilaurate are added into the mixture obtained in step 1) in a weight ratio, and then heated to 70℃ and stirred until the reaction is complete, and then the reaction product is washed, filtered and dried to obtain the modified nano-SiO2.

[0118] The silane coupling agent is vinyltriethoxysilane.

[0119] The curing agent is a mixed curing agent composed of modified isocyanate, titanium tetraisopropoxide and benzoyl oxide in a weight ratio of 1.2:0.8:1.0.

[0120] The modified isocyanate is prepared by the following method: taking polyisocyanate 30 parts, ethyl acetate 25 parts, stannous octoate 1.0 part, and bisaminopropyl silicone oil 10 parts; the polyisocyanate and the ethyl acetate are added into a reaction device and uniformly dissolved under stirring in an inert atmosphere, then the stannous octoate is added, the temperature is controlled at 8℃, the bisaminopropyl silicone oil is added, and the temperature is raised to room temperature after 6h of incubation, and then the modified isocyanate is discharged.

[0121] Comparative Example 1

[0122] The difference between this comparative example and Example 3 described above is that the nano-SiO2 is not modified in this comparative example, and the remaining raw materials are mixed in the proportions of Example 3. The remaining contents of this comparative example are the same as those of Example 3, which are not described here.

[0123] The hydrophobic angle and super-hydrophobic performance of the super-hydrophobic coating prepared in specific embodiments 3, 5 and comparative example 1 were tested by PT-705B video optical contact angle measuring instrument, the test standard was GB / T30693-2014, and the results are shown in Table 1.

[0124] Table 1

[0125] Item Example 3 Example 5 Comparative Example 1 Hydrophobic angle 156.3 154.9 106.8

[0126] It can be seen from embodiments 3 and 5 that the super-hydrophobic coating prepared in the application has excellent super-hydrophobic performance.

[0127] It can be seen from the above results that the super-hydrophobic coating on the surface of the insulator prepared in embodiment 3 has excellent performance, and the super-hydrophobic micro-nano structure formed on the surface of the insulator can adsorb an air film pad like a "lotus leaf", so that dust, salt particles, fog particles and the like cannot adhere to the surface of the insulator, the airflow brought by natural wind or high-speed locomotive can carry away the dirt on the surface in the application site, effectively solving the problem of dirt accumulation in complex cross-sea type dirty environments, reducing the operation and maintenance pressure, reducing the operation and maintenance cost, and ensuring the safe operation of the locomotive. It is suitable for large-scale production.

[0128] The above embodiments are the preferred implementation scheme of the application, in addition to this, the application can also be implemented in other ways, any obvious replacement without departing from the concept of the application is within the protection scope of the application.

Claims

1. A superhydrophobic treatment process for insulator surfaces, characterized in that: Includes the following steps: S1. Dust and oil removal: Use compressed air to remove dust from the surface of the insulator. When the air humidity is greater than 60%, the compressed air needs to be dehumidified before use. After dust removal, use a non-woven cloth or gauze soaked in solvent to wipe the insulator clean of dust and residual grease on the surface of the insulator, and then set it aside for use. S2. Spraying: Load the prepared superhydrophobic primer into the spray gun and spray it evenly onto the surface of the insulator for later use; S3, Semi-curing: Place the insulators treated in step S2 at a temperature of 20-40℃ for semi-curing treatment for 8-16 minutes, and set aside for later use; S4. Load the superhydrophobic coating into the spray gun and spray it evenly onto the surface of the insulator after the treatment in step S3. After the spraying is completed, let it stand and cure for 40-60 hours to form a superhydrophobic coating, and finally complete the superhydrophobic treatment of the insulator surface. In step S2, the superhydrophobic coating is a mixture composed of curing agent, acrylic resin and modified nano-SiO2 in a weight ratio of 2:0.8-1.6:1.0-1.

4. The modified nano-SiO2 comprises the following raw materials in parts by weight: 20-40 parts nano-SiO2, 1-5 parts silane coupling agent, 10-20 parts ethanol, 5-10 parts sodium dodecyl sulfate, 4-8 parts N,N-dimethylformamide, and 0.5-1.0 parts dibutyltin dilaurate. The silane coupling agent is vinyltriethoxysilane; The curing agent is a mixed curing agent composed of modified isocyanate, tetraisopropoxy titanium and benzoyl oxide; Step S4, the superhydrophobic coating is a polyurethane diluent.

2. The superhydrophobic treatment process for insulator surfaces according to claim 1, characterized in that: In step S2, the outlet pressure of the spray gun is 0.4-0.8MPa, the distance between the spray gun and the surface of the insulator is controlled to be 150-250mm, and the operating speed of the spray gun is 1-3m / min; after the superhydrophobic primer is sprayed, the thickness is maintained at 30-80μm.

3. The superhydrophobic treatment process for insulator surfaces according to claim 1, characterized in that: In step S1, the solvent is at least one of deionized water and anhydrous ethanol.

4. The superhydrophobic treatment process for insulator surfaces according to claim 1, characterized in that: The curing agent, acrylic resin and modified nano-SiO2 are added to the reaction device in the weight ratio and mixed and stirred for 5-20 minutes. After stirring evenly, they are allowed to mature for 5-10 minutes before they can be used for spraying.

5. The superhydrophobic treatment process for insulator surfaces according to claim 1, characterized in that: The modified nano-SiO2 was prepared through the following steps: 1) According to the weight ratio, add nano-SiO2 and silane coupling agent to ethanol, sonicate at 40-50℃ for 1-2h, ultrasonic frequency of 10-20KHz, then place in a constant temperature water bath and heat to 50-60℃, stir evenly for 2-4h to obtain a mixture for later use. 2) Sodium dodecyl sulfate, N,N-dimethylformamide and dibutyltin dilaurate are added to the mixture obtained in step 1) according to the weight ratio. The mixture is then heated to 60-70℃ and stirred until the reaction is complete. The reaction product is washed, filtered and dried to obtain modified nano-SiO2.

6. The superhydrophobic treatment process for insulator surfaces according to claim 1, characterized in that: Step S4: Spray the superhydrophobic coating 3-5 times continuously, controlling the coating thickness to be 5-20μm per coat, with an interval of 3-8 minutes between each coat.

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