An ultra-water-repellent anti-pollution flashover coating for insulators and a preparation method thereof

Abstract

The application discloses an insulator super-hydrophobic anti-pollution flashover coating and a preparation method thereof, and belongs to the technical field of anti-pollution flashover coatings. The preparation method comprises the following steps: spraying a bottom coating on the surface of a cleaned insulator, wherein the bottom coating comprises 30-45 parts of polydimethylsiloxane, 15-20 parts of micron modified aluminum hydroxide, 3-5 parts of micron modified titanium dioxide, 5-10 parts of nanometer modified silicon dioxide, 45-55 parts of a dispersing agent and 1-2 parts of a curing agent; after the bottom coating is cured, a surface coating is sprayed, and the coating is obtained after curing; the surface coating comprises 6-10 parts of polydimethylsiloxane, 7-15 parts of micron modified silicon dioxide, 3-5 parts of micron modified titanium dioxide, 0.5-5 parts of nanometer modified silicon dioxide, 75-85 parts of a dispersing agent and 0.6-0.9 parts of a curing agent. The super-hydrophobic anti-pollution flashover coating has good hydrophobic self-cleaning performance, anti-pollution flashover capacity, high durability, good anti-impact capacity and self-repairing capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anti-pollution flashover coating, and particularly relates to an ultra-hydrophobic anti-pollution flashover coating for insulators and a preparation method. BACKGROUND

[0002] The information disclosed in the background of the present application is only intended to increase the understanding of the overall background of the present application and should not necessarily be regarded as acknowledging or implicitly suggesting that this information constitutes prior art known to those skilled in the art.

[0003] An insulator is a special insulating control, mainly including glass type, ceramic type (porcelain type) and composite type. For example, a tension string of a power transmission tower must use porcelain or glass insulators, and a power transformation station device uses porcelain column insulators to improve support strength, and porcelain insulators are used in heavy icing areas to improve line safety. The glass type insulator or the ceramic type insulator is used in outdoor environment for a long time, and dirt is easily accumulated on the surface, and a pollution flashover accident is easily caused in humid weather such as rain, snow and fog. In order to cope with aging and repair treatment, the existing composite insulator also needs to be coated for protection.

[0004] At present, the main coating protection method is to coat a traditional RTV or PRTV anti-pollution flashover coating on the surface of the insulator, but this type of coating has the defects of serious dirt accumulation, difficult cleaning and short maintenance period, causing high labor cost and high replacement cost of later maintenance. In the face of this problem, the prior art directly brushes an ultra-hydrophobic coating on the surface of the insulator coated with the RTV or PRTV anti-pollution flashover coating, but this solution is only limited to the surface of the insulator coated with the RTV or PRTV anti-pollution flashover coating, and it is difficult to effectively protect the insulator without the RTV or PRTV anti-pollution flashover coating. The ultra-hydrophobic coating directly coated on the surface of the insulator generally has the defects of easy damage, insufficient durability, and difficult removal of organic dirt.

[0005] Therefore, how to provide an ultra-hydrophobic anti-pollution flashover coating directly coated on the surface of the insulator and having good durability, self-cleaning performance, anti-damage ability and self-repairing ability is a problem to be solved. SUMMARY

[0006] Therefore, the present application provides an ultra-hydrophobic anti-pollution flashover coating for insulators and a preparation method, which solves the problems of easy damage, insufficient durability and difficult removal of organic dirt of the existing ultra-hydrophobic anti-pollution flashover coating.

[0007] In a first aspect, the present application provides a preparation method of an ultra-hydrophobic anti-pollution flashover coating for insulators, including the following steps:

[0008] Spray a primer coating on the surface of the cleaned insulator, the primer coating comprising 30-45 parts of polydimethylsiloxane, 15-20 parts of micron-sized modified aluminum hydroxide, 3-5 parts of micron-sized modified titanium dioxide, 5-10 parts of nanometer-sized modified silicon dioxide, 45-55 parts of dispersing agent and 1-2 parts of curing agent;

[0009] After the primer coating is cured, spray a top coating, and after curing, the insulator is obtained.

[0010] The top coating comprises 6-10 parts of polydimethylsiloxane, 7-15 parts of micron-sized modified silicon dioxide, 3-5 parts of micron-sized modified titanium dioxide, 0.5-5 parts of nanometer-sized modified silicon dioxide, 75-85 parts of dispersing agent and 0.6-0.9 parts of curing agent.

[0011] Preferably, the primer coating has a spray thickness of 100-150 μm, and the top coating has a spray thickness of 60-80 μm.

[0012] Preferably, the polydimethylsiloxane in the primer coating has a viscosity of 10,000-16,000 mPa·S, and the polydimethylsiloxane in the top coating has a viscosity of 8,000-12,000 mPa·S.

[0013] Preferably, the micron-sized modified aluminum hydroxide in the primer coating has a particle size of 5-10 μm and is modified by γ-glycidoxypropyltrimethoxysilane.

[0014] Preferably, the micron-sized modified titanium dioxide in the primer coating and the top coating has a particle size of 1-10 μm and is modified by γ-glycidoxypropyltrimethoxysilane.

[0015] Preferably, the nanometer-sized modified silicon dioxide in the primer coating and the top coating has a particle size of 10-40 nm and is modified by tridecafluorooctyltriethoxysilane.

[0016] Preferably, the micron-sized modified silicon dioxide in the top coating has a particle size of 2-10 μm and is modified by γ-glycidoxypropyltrimethoxysilane.

[0017] Preferably, the dispersing agent in the primer coating and the top coating is selected from one or both of ethyl acetate or butyl acetate.

[0018] Preferably, the curing agent in the primer coating and the top coating is one or more of methyltriacetoxysilane, ethyltriacetoxysilane or methyltriethoxysilane.

[0019] Preferably, the curing time of the bottom layer paint is 20-50 min; the maintenance time after spraying the surface layer paint is 48 h or more, the maintenance temperature is 22-28 DEG C, and the maintenance humidity is 80% RH or less.

[0020] In a second aspect, the present application provides an ultra-water-repellent anti-pollution flashover coating for insulators prepared by the above method.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] The present application adopts a twice-spraying method to construct a double-layer ultra-water-repellent anti-pollution flashover coating on the surface of an insulator, and the construction method is simple, the raw materials are widely available and the cost is low; the water contact angle of the ultra-water-repellent anti-pollution flashover coating for insulators provided by the present application is more than 150 DEG, the rolling angle is within 10 DEG, the wetting area is less than 10% in a 30 min rain test, and the coating has good hydrophobic self-cleaning performance and anti-pollution flashover capability; in addition, the micro-defects on the surface of the coating can be filled and repaired by the small molecules in the bottom layer, so that the coating has high durability, good anti-aging capability and self-repairing capability, and no discoloration, cracking, peeling and pulverization phenomenon occurs under a 1000 h ultraviolet aging test, so that the coating has good application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which form a part of this application, are used to provide further understanding of the application and are incorporated herein in their entirety. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. Obviously, other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0024] Figure 1 is an atomic force microscope picture of the surface of the ultra-water-repellent anti-pollution flashover coating of Example 1 of the present application;

[0025] Figure 2 is a picture of the ultra-water-repellent anti-pollution flashover coating (a) of Example 1 of the present application, the coating (b) of Comparative Example 1, the coating (c) of Comparative Example 5 and the composite insulator (d) after being placed for half a year. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0027] The present application provides a preparation method of an ultra-water-repellent anti-pollution flashover coating for insulators, comprising the following steps:

[0028] Spray a primer coating on the surface of the cleaned insulator, the primer coating comprises 30-45 parts of polydimethylsiloxane, 15-20 parts of micron modified aluminum hydroxide, 3-5 parts of micron modified titanium dioxide, 5-10 parts of nano modified silicon dioxide, 45-55 parts of dispersing agent and 1-2 parts of curing agent;

[0029] After the primer coating is cured, spray a top coating, and after curing, the insulator is obtained.

[0030] The top coating comprises 6-10 parts of polydimethylsiloxane, 7-15 parts of micron modified silicon dioxide, 3-5 parts of micron modified titanium dioxide, 0.5-5 parts of nano modified silicon dioxide, 75-85 parts of dispersing agent and 0.6-0.9 parts of curing agent.

[0031] In the present application, the polydimethylsiloxane after curing mainly serves as a film-forming material, has more branched chains, smaller molecular segments and no reactive functional groups, and tends to migrate to the surface of the coating, so that the coating has a certain self-repairing ability. The micron modified aluminum hydroxide, the micron modified titanium dioxide, the nano modified silicon dioxide, the micron modified silicon dioxide and the micron modified aluminum hydroxide mainly serve as the construction materials of micro-nano structures, and the dispersing agent mainly serves to improve the uniformity of the powder in the coating system. The primer coating and the top coating of the present application are not completely the same in function, the primer coating contains micron modified aluminum hydroxide, which closely contacts with the surface of the insulator and can improve the electrical erosion resistance of the coating.

[0032] The cleaning step of the insulator in the present application is not specially limited, and the cleaning step commonly used in the art can be adopted, for example, the surface of the insulator is cleaned by wiping with a non-woven fabric dipped in a cleaning agent, so that the surface is free of dirt and dust; the cleaning agent is selected from one or more of ethanol, ethyl acetate or butyl acetate.

[0033] In the present application, the spraying thickness of the primer coating is 100-150 mu m, and the spraying thickness of the top coating is 60-80 mu m. The primer coating is thicker, so as to ensure that the coating has good electrical erosion resistance, and the thinner top coating is more conducive to realizing long-term hydrophobicity.

[0034] In the present application, the viscosity of the polydimethylsiloxane in the primer coating is 10000-16000 mPa·S, and the viscosity of the polydimethylsiloxane in the top coating is 8000-12000 mPa·S.

[0035] In the present application, the particle size of the micron modified aluminum hydroxide in the primer coating is 5-10 mu m, which is modified by gamma-glycidyl ether propyl trimethoxysilane and can be directly obtained by a commercial route.

[0036] In the present application, the particle size of the micron-sized modified titanium dioxide in the base coating and the top coating is 1-10 μm, which is modified by γ-glycidyloxypropyltrimethoxysilane and can be directly obtained through a commercial route.

[0037] In the present application, the particle size of the nano-sized modified silica in the base coating and the top coating is 10-40 nm, which is modified by tridecafluorooctyltriethoxysilane and can be directly obtained through a commercial route.

[0038] In the present application, the particle size of the micron-sized modified silica in the top coating is 2-10 μm, which is modified by γ-glycidyloxypropyltrimethoxysilane and can be directly obtained through a commercial route.

[0039] In the present application, the dispersant in the base coating and the top coating is selected from one or both of ethyl acetate or butyl acetate. The dispersant helps to improve the uniform dispersion of various micron-sized and nano-sized fillers in the coating.

[0040] In the present application, the curing agent in the base coating and the top coating is one or more of methyltriacetoxysilane, ethyltriacetoxysilane or methyltriethoxysilane.

[0041] In the present application, the curing time of the base coating is 20-50 min; the maintenance time after spraying the top coating is 48 h or more, the maintenance temperature is 22-28℃, and the maintenance humidity is 80% RH or less.

[0042] The preparation method of the base coating is not specially limited in the present application, and a commonly used coating preparation method in the art can be used. Preferably, according to the formula amount, the micron-sized modified aluminum hydroxide, the micron-sized modified titanium dioxide, the nano-sized modified silica and the dispersant are mixed, then ultrasonic dispersion treatment is performed for 15-30 min to obtain a uniform dispersion liquid; then the dispersion liquid is stirred and dispersed under a high-speed dispersion machine for 20-40 min, then the formula amount of polydimethylsiloxane is added; the stirring state is maintained unchanged for 2-3 h; the room temperature condition is maintained for aging for 24 h to obtain the base coating, then filling is performed, and the base coating is mixed with the formula amount of the curing agent before spraying to obtain the base coating.

[0043] The preparation method of the surface layer coating is not particularly limited in the present application, and a coating preparation method commonly used in the art can be adopted. Preferably, micron-sized modified silicon dioxide, micron-sized modified titanium dioxide, nanometer-sized modified silicon dioxide and a dispersing agent are mixed according to the formula amount, and then ultrasonic dispersion treatment is performed for 10-20 min to obtain a uniform dispersion liquid; the dispersion liquid is stirred and dispersed under a high-speed dispersion machine for 8-15 min, and then a formula amount of polydimethylsiloxane is added; the stirring state is maintained unchanged for 4-6 h; the surface coating is obtained by standing and aging at room temperature for 24 h, and then filling is performed, and the surface coating is mixed with a formula amount of a curing agent before spraying to obtain the surface layer coating.

[0044] The present application also provides an ultra-hydrophobic anti-pollution flashover coating for insulators prepared by the above preparation method. The water contact angle of the ultra-hydrophobic anti-pollution flashover coating for insulators is above 150°, the rolling angle is within 10°, the wetting area is less than 10% in a 30 min rain test, and the coating has good hydrophobic self-cleaning performance and anti-pollution flashover ability; in addition, the micro-defects on the surface layer of the coating can be repaired by the migration of small molecules in the bottom layer, so that the coating has high durability, good anti-impact ability and self-repairing ability, and no discoloration, cracking, peeling and pulverization phenomenon occurs under a 1000 h ultraviolet aging test.

[0045] The technical solutions of the present application will be further described below in combination with specific examples.

[0046] Example 1

[0047] The present embodiment provides a preparation method of an ultra-hydrophobic anti-pollution flashover coating.

[0048] The bottom layer coating formula: polydimethylsiloxane 35 parts, micron-sized modified aluminum hydroxide 15.7 parts, micron-sized modified titanium dioxide 3 parts, nanometer-sized modified silicon dioxide 5 parts, ethyl acetate 45 parts, and curing agent methyltriacetoxysilane 1 part. Among them, the viscosity of the polydimethylsiloxane is 14000 mPa·S; the particle size of the micron-sized modified aluminum hydroxide is 5-10 μm, which is modified by γ-glycidyl ether propyltrimethoxysilane; the particle size of the micron-sized modified titanium dioxide is 2-3 μm, which is modified by γ-glycidyl ether propyltrimethoxysilane; and the particle size of the nanometer-sized modified silicon dioxide is 10-20 nm, which is modified by tridecafluorooctyltriethoxysilane.

[0049] The bottom coating preparation process is as follows: (1) according to the formula amount, first mix micron modified aluminum hydroxide, micron modified titanium dioxide, nanometer modified silicon dioxide and dispersant, and then perform ultrasonic dispersion treatment for 20 min to obtain a uniform dispersion liquid; (2) then perform stirring dispersion of the dispersion liquid under a high-speed dispersion machine for 30 min, and then add formula amount of polydimethylsiloxane; (3) continue to maintain the stirring state unchanged for 2 h; (4) under room temperature, stand and age for 24 h to obtain the bottom coating, and then perform filling, and mix the bottom coating with formula amount of curing agent before spraying to obtain the bottom layer coating.

[0050] The top coating formula is as follows: 7.3 parts of polydimethylsiloxane, 7 parts of micron modified silicon dioxide, 4 parts of micron modified titanium dioxide, 0.5 parts of nanometer modified silicon dioxide, 76 parts of ethyl acetate and 0.7 parts of curing agent methyltriacetoxysilane. The viscosity of the polydimethylsiloxane is 9000 mPa·S; the micron modified silicon dioxide has a particle size of 4-8 μm and is modified by γ-glycidoxypropyltrimethoxysilane; the micron modified titanium dioxide has a particle size of 6-10 μm and is modified by γ-glycidoxypropyltrimethoxysilane; and the nanometer modified silicon dioxide has a particle size of 20-40 nm and is modified by tridecafluorooctyltriethoxysilane.

[0051] The top coating preparation process is as follows: (1) according to the formula amount, first mix micron modified silicon dioxide, micron modified titanium dioxide, nanometer modified silicon dioxide and dispersant, and then perform ultrasonic dispersion treatment for 15 min to obtain a uniform dispersion liquid; (2) then perform stirring dispersion of the dispersion liquid under a high-speed dispersion machine for 10 min, and then add formula amount of polydimethylsiloxane; (3) continue to maintain the stirring state unchanged for 4 h; (4) under room temperature, stand and age for 24 h to obtain the top coating, and then perform filling, and mix the top coating with formula amount of curing agent before spraying to obtain the top layer coating.

[0052] The coating preparation process is as follows:

[0053] (1) The surface pretreatment of the insulator: use non-woven fabric dipped in ethanol cleaning agent to wipe and clean the surface of the insulator so that the surface is clean and dust-free;

[0054] (2) The spraying process: uniformly spray the prepared bottom layer coating on the surface of the insulator by an air spray gun, and the spraying thickness is 120 μm; after spraying, perform curing and maintenance for 30 min; uniformly spray the prepared top layer coating on the surface of the insulator by an air spray gun, and the spraying thickness is 60 μm; the sprayed coating is maintained for 48 h under the conditions of good ventilation, temperature of 25 ℃ and humidity of 80% RH.

[0055] Example 2

[0056] The embodiment provides a preparation method of an ultra-hydrophobic anti-pollution flashover coating.

[0057] The bottom coating formula comprises 30 parts of polydimethylsiloxane, 15.7 parts of micron modified aluminum hydroxide, 3 parts of micron modified titanium dioxide, 7 parts of nanometer modified silicon dioxide, 50 parts of ethyl acetate and 1 part of curing agent ethyltriacetoxysilane. The polydimethylsiloxane has a viscosity of 14000 mPa·S; the micron modified aluminum hydroxide has a particle size of 5-10 μm and is modified by γ-glycidoxypropyltrimethoxysilane; the micron modified titanium dioxide has a particle size of 2-3 μm and is modified by γ-glycidoxypropyltrimethoxysilane; and the nanometer modified silicon dioxide has a particle size of 10-20 nm and is modified by tridecafluorooctyltriethoxysilane.

[0058] The bottom coating preparation process comprises the following steps: (1) according to the formula amount, the micron modified aluminum hydroxide, the micron modified titanium dioxide, the nanometer modified silicon dioxide and a dispersing agent are mixed, and then ultrasonic dispersion treatment is performed for 20 min to obtain a uniform dispersion liquid; (2) then the dispersion liquid is stirred and dispersed for 30 min under a high-speed dispersion machine, and then the formula amount of polydimethylsiloxane is added; (3) the stirring state is continuously maintained unchanged for 2 h; and (4) the bottom coating is obtained by standing and aging for 24 h under room temperature conditions, and then filling is performed, and the bottom coating is mixed with the formula amount of curing agent before spraying to obtain the bottom coating.

[0059] The top coating formula comprises 7 parts of polydimethylsiloxane, 7.2 parts of micron modified silicon dioxide, 4.2 parts of micron modified titanium dioxide, 4.95 parts of nanometer modified silicon dioxide, 76 parts of ethyl acetate and 0.7 parts of curing agent ethyltriacetoxysilane. The polydimethylsiloxane has a viscosity of 9000 mPa·S; the micron modified silicon dioxide has a particle size of 4-8 μm and is modified by γ-glycidoxypropyltrimethoxysilane; the micron modified titanium dioxide has a particle size of 6-10 μm and is modified by γ-glycidoxypropyltrimethoxysilane; and the nanometer modified silicon dioxide has a particle size of 20-40 nm and is modified by tridecafluorooctyltriethoxysilane.

[0060] The surface coating preparation process is as follows: (1) micron modified silicon dioxide, micron modified titanium dioxide, nanometer modified silicon dioxide and dispersant are mixed according to the formula amount, and then ultrasonic dispersion treatment is performed for 15 min to obtain a uniform dispersion liquid; (2) the dispersion liquid is stirred and dispersed under a high-speed dispersion machine for 10 min, and then the formula amount of polydimethylsiloxane is added; (3) the stirring state is maintained unchanged for 4 h; (4) the surface coating is obtained after standing and aging at room temperature for 24 h, and then filling is performed, and the surface coating is mixed with the formula amount of curing agent before spraying to obtain the surface layer coating.

[0061] The coating preparation process is as follows:

[0062] (1) The surface of the insulator is cleaned by using a non-woven fabric dipped in ethanol cleaning agent, so that the surface is clean and dust-free;

[0063] (2) The prepared base coating is uniformly sprayed on the surface of the insulator by an air spray gun, and the spraying thickness is 120 μm; after spraying, curing and maintenance are performed for 30 min; the prepared surface layer coating is uniformly sprayed on the surface of the insulator by an air spray gun, and the spraying thickness is 60 μm; the sprayed coating is maintained for 48 h under the conditions of good ventilation, temperature of 25 ℃ and humidity of 80% RH.

[0064] Example 3

[0065] The embodiment provides a preparation method of an ultra-hydrophobic anti-pollution flashover coating.

[0066] The base coating formula is as follows: 30 parts of polydimethylsiloxane, 15.7 parts of micron modified aluminum hydroxide, 3 parts of micron modified titanium dioxide, 8 parts of nanometer modified silicon dioxide, 50 parts of ethyl acetate, 0.5 part of curing agent methyltriacetoxysilane and 0.8 part of ethyltriacetoxysilane. The viscosity of the polydimethylsiloxane is 14000 mPa·S; the micron modified aluminum hydroxide has a particle size of 5-10 μm and is modified by γ-glycidyl ether propyltrimethoxysilane; the micron modified titanium dioxide has a particle size of 2-3 μm and is modified by γ-glycidyl ether propyltrimethoxysilane; and the nanometer modified silicon dioxide has a particle size of 10-20 nm and is modified by tridecafluorooctyltriethoxysilane.

[0067] The bottom coating preparation process comprises the following steps: (1) according to the formula amount, first mix micron modified aluminum hydroxide, micron modified titanium dioxide, nanometer modified silicon dioxide and a dispersing agent, and then perform ultrasonic dispersion treatment for 20 min to obtain a uniform dispersion liquid; (2) then perform stirring dispersion of the dispersion liquid under a high-speed dispersion machine for 30 min, and then add formula amount of polydimethylsiloxane; (3) continue to maintain the stirring state unchanged for 2 h; (4) under room temperature, stand and age for 24 h to obtain the bottom coating, and then perform filling, and before spraying, mix the bottom coating with formula amount of a curing agent to obtain the bottom layer coating.

[0068] The top coating formula comprises the following components: 7 parts of polydimethylsiloxane, 7.2 parts of micron modified silicon dioxide, 4.2 parts of micron modified titanium dioxide, 2 parts of nanometer modified silicon dioxide, 76 parts of ethyl acetate, 0.3 parts of methyltriacetoxysilane and 0.4 parts of ethyltriacetoxysilane.

[0069] The top coating preparation process comprises the following steps: (1) according to the formula amount, first mix micron modified silicon dioxide, micron modified titanium dioxide, nanometer modified silicon dioxide and a dispersing agent, and then perform ultrasonic dispersion treatment for 15 min to obtain a uniform dispersion liquid; (2) then perform stirring dispersion of the dispersion liquid under a high-speed dispersion machine for 10 min, and then add formula amount of polydimethylsiloxane; (3) continue to maintain the stirring state unchanged for 4 h; (4) under room temperature, stand and age for 24 h to obtain the top coating, and then perform filling, and before spraying, mix the top coating with formula amount of a curing agent to obtain the top layer coating.

[0070] The coating preparation process comprises the following steps:

[0071] (1) The surface pretreatment of the insulator: use non-woven fabric dipped in an ethanol cleaning agent to wipe and clean the surface of the insulator, so that the surface is clean and dust-free;

[0072] (2) The spraying process: uniformly spray the prepared bottom layer coating on the surface of the insulator through an air spray gun, and the spraying thickness is 120 μm; after spraying is completed, perform curing maintenance for 30 min; uniformly spray the prepared top layer coating on the surface of the insulator through an air spray gun, and the spraying thickness is 60 μm; the sprayed coating is maintained for 48 h under the conditions that the ventilation condition is good, the temperature is 25 ℃ and the humidity is 80% RH.

[0073] Example 4

[0074] The embodiment provides a preparation method of an ultra-water-repellent anti-pollution flashover coating.

[0075] The primer coating formula: 30 parts of polydimethylsiloxane, 15.7 parts of micron modified aluminum hydroxide, 3 parts of micron modified titanium dioxide, 6 parts of nanometer modified silicon dioxide, 25 parts of ethyl acetate and butyl acetate respectively, 0.5 parts of curing agent methyl triacetoxy silane, 0.5 parts of ethyl triacetoxy silane. Among them, the viscosity of polydimethylsiloxane is 14000 mPa·S; the particle size of micron modified aluminum hydroxide is 5-10 μm, which is modified by γ-glycidyl ether propyl trimethoxysilane; the particle size of micron modified titanium dioxide is 2-3 μm, which is modified by γ-glycidyl ether propyl trimethoxysilane; the particle size of nanometer modified silicon dioxide is 10-20 nm, which is modified by tridecafluorooctyl triethoxysilane.

[0076] The primer coating preparation process: (1) according to the formula amount, first mix micron modified aluminum hydroxide, micron modified titanium dioxide, nanometer modified silicon dioxide and dispersing agent, then ultrasonic dispersion treatment for 20 min, obtain uniform dispersion liquid; (2) then the dispersion liquid is stirred and dispersed under high speed dispersion machine for 30 min, then add formula amount of polydimethylsiloxane; (3) continue to maintain the stirring state unchanged, keep 2h; (4) room temperature conditions static aging 24h, get primer, then filling, before spraying, mix primer with formula amount of curing agent, get primer coating.

[0077] The topcoat coating formula: 7 parts of polydimethylsiloxane, 7.2 parts of micron modified silicon dioxide, 4.2 parts of micron modified titanium dioxide, 4.95 parts of nanometer modified silicon dioxide, 38 parts of ethyl acetate and butyl acetate respectively, 0.3 parts of curing agent methyl triacetoxy silane, 0.4 parts of ethyl triacetoxy silane. Among them, the viscosity of polydimethylsiloxane is 9000 mPa·S; the particle size of micron modified silicon dioxide is 4-8 μm, which is modified by γ-glycidyl ether propyl trimethoxysilane; the particle size of micron modified titanium dioxide is 6-10 μm, which is modified by γ-glycidyl ether propyl trimethoxysilane; the particle size of nanometer modified silicon dioxide is 20-40 nm, which is modified by tridecafluorooctyl triethoxysilane.

[0078] The topcoat coating preparation process: (1) according to the formula amount, first mix micron modified silicon dioxide, micron modified titanium dioxide, nanometer modified silicon dioxide and dispersing agent, then ultrasonic dispersion treatment for 15 min, obtain uniform dispersion liquid; (2) then the dispersion liquid is stirred and dispersed under high speed dispersion machine for 10 min, then add formula amount of polydimethylsiloxane; (3) continue to maintain the stirring state unchanged, keep 4h; (4) room temperature conditions static aging 24h, get topcoat, then filling, before spraying, mix topcoat with formula amount of curing agent, get topcoat coating.

[0079] Coating preparation process:

[0080] (1) Insulator surface pretreatment: use non-woven fabric dipped in ethanol cleaning agent to clean the surface of the insulator, so that the surface is clean and dust-free;

[0081] (2) Spraying process: evenly spray the prepared base coating on the surface of the insulator through an air spray gun, with a spraying thickness of 120 μm; after spraying is completed, curing and maintenance for 30 min; evenly spray the prepared surface coating on the surface of the insulator through an air spray gun, with a spraying thickness of 60 μm; the sprayed coating is maintained for 48 h under the conditions of good ventilation, temperature of 25 ℃, and humidity of 80% RH.

[0082] Example 5

[0083] The present embodiment provides a preparation method of an ultra-water-repellent anti-pollution flashover coating.

[0084] The base coating formula is: 30 parts of polydimethylsiloxane, 15.7 parts of micron modified aluminum hydroxide, 3 parts of micron modified titanium dioxide, 5 parts of nanometer modified silicon dioxide, 25 parts of ethyl acetate and butyl acetate each, 0.5 parts of curing agent methyltriacetoxysilane, and 0.5 parts of ethyltriacetoxysilane. Among them, the viscosity of polydimethylsiloxane is 14000 mPa·S; the particle size of micron modified aluminum hydroxide is 5-10 μm, which is modified by γ-glycidyl ether propyltrimethoxysilane; the particle size of micron modified titanium dioxide is 2-3 μm, which is modified by γ-glycidyl ether propyltrimethoxysilane; the particle size of nanometer modified silicon dioxide is 10-20 nm, which is modified by tridecafluorooctyltriethoxysilane.

[0085] The base coating preparation process is: (1) according to the formula amount, first mix micron modified aluminum hydroxide, micron modified titanium dioxide, nanometer modified silicon dioxide and dispersing agent, then perform ultrasonic dispersion treatment for 20 min to obtain a uniform dispersion liquid; (2) then stir and disperse the dispersion liquid under a high-speed dispersion machine for 30 min, and then add the formula amount of polydimethylsiloxane; (3) continue to maintain the stirring state unchanged for 2 h; (4) under room temperature conditions, stand and age for 24 h to obtain the base coating, then perform filling, and mix the base coating with the formula amount of curing agent before spraying to obtain the base coating.

[0086] The surface coating formula: 7 parts of polydimethylsiloxane, 7.2 parts of micron modified silica, 4.2 parts of micron modified titanium dioxide, 3 parts of nanometer modified silica, 38 parts of ethyl acetate and butyl acetate respectively, 0.3 parts of curing agent methyltriacetoxysilane, 0.4 parts of ethyltriacetoxysilane. Among them, the viscosity of polydimethylsiloxane is 9000 mPa·S; the particle size of micron modified silica is 4-8 μm, which is modified by γ-glycidyl ether propyltrimethoxysilane; the particle size of micron modified titanium dioxide is 6-10 μm, which is modified by γ-glycidyl ether propyltrimethoxysilane; the particle size of nanometer modified silica is 20-40 nm, which is modified by tridecafluorooctyltriethoxysilane.

[0087] The surface coating preparation process is as follows: (1) according to the formula amount, first mix micron modified silica, micron modified titanium dioxide, nanometer modified silica and dispersing agent, then perform ultrasonic dispersion treatment for 15 min to obtain a uniform dispersion liquid; (2) then perform stirring dispersion of the dispersion liquid under a high-speed dispersion machine for 10 min, and then add polydimethylsiloxane of the formula amount; (3) continue to maintain the stirring state unchanged for 4 h; (4) stand and age at room temperature for 24 h to obtain a surface coating, and then perform filling, and mix the surface coating with curing agent of the formula amount before spraying to obtain a surface layer coating.

[0088] The coating preparation process is as follows:

[0089] (1) The surface pretreatment of the insulator: use non-woven fabric dipped in ethanol cleaning agent to wipe and clean the surface of the insulator, so that the surface is clean and dust-free;

[0090] (2) Spraying process: uniformly spray the prepared base coating on the surface of the insulator through an air spray gun, and the spraying thickness is 120 μm; after spraying is completed, perform curing and maintenance for 30 min; uniformly spray the prepared surface layer coating on the surface of the insulator through an air spray gun, and the spraying thickness is 60 μm; the sprayed coating is maintained for 48 h under the conditions of good ventilation, temperature of 25 ℃ and humidity of 80% RH.

[0091] Comparative Example 1

[0092] Compared with Example 1, the difference is that only the surface layer coating is sprayed on the surface of the insulator in the present comparative example, and no base coating is sprayed.

[0093] Comparative Example 2

[0094] The difference between the present comparative example and Example 1 is that, in the primer coating and the top coating of the present comparative example, unmodified micrometer-sized aluminum hydroxide is used instead of the micrometer-sized modified aluminum hydroxide, unmodified micrometer-sized titanium dioxide is used instead of the micrometer-sized modified titanium dioxide, unmodified nanometer-sized silicon dioxide is used instead of the nanometer-sized modified silicon dioxide, and unmodified micrometer-sized silicon dioxide is used instead of the micrometer-sized modified silicon dioxide.

[0095] Comparative Example 3

[0096] The difference between the present comparative example and Example 1 is that, in the primer coating and the top coating of the present comparative example, unmodified micrometer-sized aluminum hydroxide is used instead of the micrometer-sized modified aluminum hydroxide, unmodified micrometer-sized titanium dioxide is used instead of the micrometer-sized modified titanium dioxide, unmodified nanometer-sized silicon dioxide is used instead of the nanometer-sized modified silicon dioxide, and unmodified micrometer-sized silicon dioxide is used instead of the micrometer-sized modified silicon dioxide.

[0097] Comparative Example 4

[0098] The difference between the present comparative example and Example 1 is that, in the primer coating and the top coating of the present comparative example, unmodified micrometer-sized aluminum hydroxide is used instead of the micrometer-sized modified aluminum hydroxide, unmodified micrometer-sized titanium dioxide is used instead of the micrometer-sized modified titanium dioxide, unmodified nanometer-sized silicon dioxide is used instead of the nanometer-sized modified silicon dioxide, and unmodified micrometer-sized silicon dioxide is used instead of the micrometer-sized modified silicon dioxide.

[0099] Comparative Example 5

[0100] The difference between the present comparative example and Example 1 is that, in the primer coating and the top coating of the present comparative example, unmodified micrometer-sized aluminum hydroxide is used instead of the micrometer-sized modified aluminum hydroxide, unmodified micrometer-sized titanium dioxide is used instead of the micrometer-sized modified titanium dioxide, unmodified nanometer-sized silicon dioxide is used instead of the nanometer-sized modified silicon dioxide, and unmodified micrometer-sized silicon dioxide is used instead of the micrometer-sized modified silicon dioxide.

[0101] Test Example

[0102] The coating performance of Examples 1-5 and Comparative Examples 1-5 and the surface performance of the glass sheet (ordinary glass sheet) and the ceramic sheet (ordinary glazed ceramic sheet) were determined, as shown in Tables 1 and 2.

[0103] Table 1: Determination of the super-hydrophobic anti-pollution flashover coating performance of the insulator of Examples 1-5

[0104]

[0105] Table 2: Determination of the coating performance of Comparative Examples 1-5 and the glass sheet and the ceramic sheet

[0106]

[0107] Figure 1 The atomic force microscope picture of the surface of the super-hydrophobic anti-pollution flashover coating of Example 1. Figure 2 The photos of the super-hydrophobic anti-pollution flashover coating of Example 1, the coating of Comparative Example 1, the coating of Comparative Example 5, and the composite insulator after being placed for half a year show that, after being placed for half a year, the surface of the coating of Example 1 remains smooth, without obvious cracks, falling off, or dust sticking, and the coating of Example 1 has more excellent self-cleaning, anti-cracking, and durability than the single-layer top coating of Comparative Example 1 and the PRTV coating of Comparative Example 5.

[0108] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A method for preparing a superhydrophobic anti-flashover coating for insulators, characterized in that, Includes the following steps: A primer coating is sprayed onto the cleaned insulator surface. The primer coating comprises 30-45 parts of polydimethylsiloxane, 15-20 parts of micron-sized modified aluminum hydroxide, 3-5 parts of micron-sized modified titanium dioxide, 5-10 parts of nano-sized modified silica, 45-55 parts of dispersant, and 1-2 parts of curing agent. After the base coat has cured, spray on the top coat and cure it to finish. The topcoat comprises 6-10 parts polydimethylsiloxane, 7-15 parts micron-sized modified silica, 3-5 parts micron-sized modified titanium dioxide, 0.5-5 parts nano-sized modified silica, 75-85 parts dispersant and 0.6-0.9 parts curing agent; The micron-sized modified aluminum hydroxide in the base coat is obtained by modification with γ-glycidyl oxypropyltrimethoxysilane; the micron-sized modified titanium dioxide in the base coat and top coat is obtained by modification with γ-glycidyl oxypropyltrimethoxysilane; the nano-sized modified silica in the base coat and top coat is obtained by modification with tridecafluorooctyltriethoxysilane; and the micron-sized modified silica in the top coat is obtained by modification with γ-glycidyl oxypropyltrimethoxysilane.

2. The preparation method according to claim 1, characterized in that, The thickness of the base coat is 100~150μm, and the thickness of the top coat is 60~80μm.

3. The preparation method according to claim 1, characterized in that, The viscosity of the polydimethylsiloxane in the base coat is 10,000 to 16,000 mPa·s, and the viscosity of the polydimethylsiloxane in the top coat is 8,000 to 12,000 mPa·s.

4. The preparation method according to claim 1, characterized in that, The micron-sized modified aluminum hydroxide in the base coating has a particle size of 5~10μm; the micron-sized modified titanium dioxide in the base coating and top coating has a particle size of 1~10μm.

5. The preparation method according to claim 1, characterized in that, The nano-sized modified silica in the base coat and top coat has a particle size of 10~40nm.

6. The preparation method according to claim 1, characterized in that, The micron-sized modified silica in the topcoat has a particle size of 2~10μm.

7. The preparation method according to claim 1, characterized in that, The dispersant in the base coat and top coat is selected from one or both of ethyl acetate or butyl acetate.

8. The preparation method according to claim 1, characterized in that, The curing agent in the base coat and top coat is one or more of methyltriacetoxysilane, ethyltriacetoxysilane, or methyltriethoxysilane.

9. The preparation method according to claim 1, characterized in that, The curing time for the base coat is 20-50 minutes; the curing time after spraying the top coat is more than 48 hours, the curing temperature is 22-28℃, and the curing humidity is below 80%RH.

10. The superhydrophobic anti-flashover coating for insulators prepared by the preparation method according to any one of claims 1 to 9.

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