Two-component fluororesin-based anti-pollution flashover coating as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of coatings for insulation protection in the power industry, and particularly relates to a two-component fluororesin-based anti-pollution flashover coating as well as a preparation method and application thereof. According to the invention, a surface micro-nano rough structure is constructed by introducing the compound fluororesin and the multi-size powder particles, adding the auxiliary agent and the like, and the anti-pollution flashover coating with strong aging resistance, super-hydrophobicity and high self-cleaning property is designed. Wherein the compound fluororesin adopts a perfluororesin base material, the carbon chain of the perfluororesin is spiral, and the energy of a C-F bond is relatively large, so that the carbon-carbon bond is protected, the surface bond is prevented from being broken and aged, and the aging resistance of the coating in outdoor use is improved; nanoscale titanium dioxide has an organic photocatalytic degradation effect, so that adhesion and accumulation of organic dirt caused by long-term outdoor use are avoided; through the synergistic effect of all the components, a surface micro-nano rough structure is constructed, so that the surface of the coating has super-hydrophobicity, dirt on the surface is easily taken away in rainy days, high self-cleaning performance is achieved, and important theoretical significance and application value are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of insulating protective coatings in the electric power industry, and in particular relates to a two-component fluororesin-based anti-pollution flashover coating and a preparation method and application thereof. Background Art

[0003] Room temperature vulcanized silicone rubber RTV (Room Temperature Vulcanized silicon rubber) and improved long-lasting PRTV (Persistent RTV) anti-pollution flashover coatings have been widely used in my country's power transmission and transformation projects since the early 1990s because of their good hydrophobicity, hydrophobic migration and on-site forming. They have played a good role in preventing the occurrence of pollution flashover accidents.

[0004] Analysis shows that the current RTV coatings have the following problems: (1) Due to the easy light aging characteristics of silicone materials, the hydrophobicity and antifouling properties gradually decrease after long-term use in the atmosphere, and the sustained effective effect is not strong. The current statistical validity period is mostly 5 to 8 years; (2) Due to the hydrophobic and lipophilic properties of silicone rubber coatings themselves, the deposition of organic pollutants cannot be avoided. In the case of poor mobility, it is easy to form large contact angle water droplets on the surface, which reduces the insulation performance and increases the probability of flashover; (3) The hydrophobicity of organic substances is contradictory to the anti-fouling performance, that is, while improving the anti-fouling performance, the hydrophobicity and hydrophobic migration performance may be reduced. Therefore, the development of an anti-fouling flashover coating that has strong aging resistance, super hydrophobicity, and high self-cleaning properties has important scientific significance and application value. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a two-component fluororesin-based anti-pollution flashover coating and a preparation method and application thereof. The two-component fluororesin-based anti-pollution flashover coating prepared by the present invention constructs a micro-nano rough structure by compounding fluororesin, introducing multi-sized powder particles and additives, and designs an anti-pollution flashover coating with strong aging resistance, super hydrophobicity and high self-cleaning property.

[0006] Specifically, the technical solution of the present invention is as follows:

[0007] The first aspect of the present invention provides a two-component fluororesin-based anti-pollution flashover coating, comprising component A and component B; wherein component A comprises the following raw materials in parts by weight: 100 parts of fluororesin, 65 to 90 parts of filler, 10 to 15 parts of flame retardant, 1 to 3 parts of other additives, and 100 parts of dispersing solvent; component B comprises 20 to 25 parts of curing agent.

[0008] Preferably, the fluororesin is a mixture of a copolymer resin of tetrafluoroethylene and an alkyl vinyl ester and a copolymer resin of chlorotrifluoroethylene and an alkyl vinyl ester.

[0009] Preferably, the filler includes nano-sized silicon dioxide, micron-sized silicon dioxide, and nano-sized titanium dioxide;

[0010] Among them, the particle size of the nano-scale silicon dioxide is 20-35nm, and the surface is treated with KH550 silane coupling agent; the particle size of the micron-scale silicon dioxide is 2-5um, and the surface is treated with KH550 silane coupling agent; the particle size of the nano-scale titanium dioxide is 80-120nm, and the surface is treated with KH550 silane coupling agent.

[0011] Preferably, the flame retardant is selected from one or more of ammonium polyphosphate and aluminum oxide.

[0012] Preferably, the other additives include defoamers, leveling agents, wetting and dispersing agents, and adhesion promoters;

[0013] Wherein, the defoaming agent is a mixture of BYK066 and BYK054; further preferably, the mass ratio of BYK066 to BYK054 is 1:1;

[0014] The leveling agent is BYK358N; the wetting and dispersing agent is BYK110; and the adhesion promoter is BYK4510.

[0015] Preferably, the dispersing solvent is a mixture of ethyl acetate and butyl acetate.

[0016] Preferably, the curing agent is a polyisocyanate curing agent; further preferably, the curing agent is selected from one or more of hexamethylene diisocyanate HDI and diphenylmethane diisocyanate MDI.

[0017] The second aspect of the present invention provides a method for preparing the above-mentioned two-component fluororesin-based anti-pollution flashover coating, comprising the following steps:

[0018] S1, mixing nano-sized silicon dioxide, micron-sized silicon dioxide and nano-sized titanium dioxide to prepare a filler;

[0019] S2, adding the filler into a mixture of butyl acetate and ethyl acetate to prepare a dispersion;

[0020] S3, adding a copolymer resin of tetrafluoroethylene and an alkyl vinyl ester and a copolymer resin of chlorotrifluoroethylene and an alkyl vinyl ester to the dispersion, followed by heating for reaction to obtain a fluororesin dispersion;

[0021] S4, mixing fluororesin dispersion, flame retardant, defoamer, leveling agent, wetting dispersant and adhesion promoter to obtain two-component fluororesin-based anti-fouling flashover coating component A;

[0022] S5. Mix component A of the two-component fluororesin-based anti-pollution flashover coating with a curing agent to obtain the two-component fluororesin-based anti-pollution flashover coating.

[0023] Preferably, in step S1, the weight ratio of the nano-scale silicon dioxide, micron-scale silicon dioxide and nano-scale titanium dioxide is 25-35:30-40:10-15.

[0024] Preferably, in step S2, the mass ratio of ethyl acetate to butyl acetate is 3:7.

[0025] Preferably, in step S3, the viscosity of the copolymer resin of tetrafluoroethylene and alkyl vinyl ester is 5000-6000 mPa.S, accounting for 40%-60% of the mass ratio of the fluororesin, and the viscosity of the copolymer resin of chlorotrifluoroethylene and alkyl vinyl ester is 5000-6000 mPa.S, accounting for 40%-60% of the mass ratio of the fluororesin.

[0026] Preferably, in step S3, the temperature of the heating reaction is 95-115° C., and the time of the heating reaction is 0.5 h-1.5 h.

[0027] More preferably, the heating reaction temperature is 105° C. and the heating reaction time is 1 h.

[0028] The third aspect of the present invention provides an application of the two-component fluororesin-based anti-pollution flashover coating described in the first aspect on the surface of power equipment and insulators.

[0029] In a fourth aspect, the present invention provides a method for using the two-component fluororesin-based anti-pollution flashover coating according to the first aspect in power equipment, comprising the following steps:

[0030] (1) Clean and dry the surface of the electrical equipment;

[0031] (2) mixing component A and component B of a two-component fluororesin-based anti-pollution flashover coating, and then applying the mixture on the surface of the power equipment;

[0032] (3) After the coating is completely cured, an effective protective coating is obtained.

[0033] Preferably, the coating method is selected from one of air spraying, airless spraying and brushing;

[0034] Preferably, the curing time is 20 to 24 hours.

[0035] In a fifth aspect, the present invention provides a method for applying the two-component fluororesin-based anti-pollution flashover coating according to the first aspect to an insulator surface, comprising the following steps:

[0036] (1) Clean and dry the surface of the insulator;

[0037] (2) Mixing component A and component B of a two-component fluororesin-based anti-pollution flashover coating, and then applying the mixture on the surface of the insulator;

[0038] (3) After the coating is completely cured, an effective protective coating is obtained.

[0039] Preferably, the coating method is selected from one of air spraying, airless spraying and brushing.

[0040] Preferably, the curing time is 20 to 24 hours.

[0041] One or more embodiments of the present invention have at least the following beneficial effects:

[0042] (1) The two-component fluororesin-based anti-fouling flashover coating prepared by the present invention adopts a perfluororesin base material. The carbon chain of the perfluororesin is helical and the CF bond energy is relatively large, which protects the carbon-carbon bond and avoids the breakage and aging of the surface bonds. At the same time, the synergistic interaction with the added powder particles can lead to the improvement of the overall performance. For example, the introduction of silicon-oxygen bonds in the silica powder material improves the stability of the overall structure of the coating system. The micro-nano rough surface structure introduced into the structure of the powder material forms diffuse reflection of light and reduces the absorption of light energy. Moreover, the added powder materials are all non-combustible substances. On the one hand, they can improve the overall flame retardancy of the coating system. On the other hand, the porous hard structure formed by the inorganic filler during the combustion process is also conducive to preventing combustion.

[0043] (2) The nano-sized titanium dioxide added in the present invention has an organic photocatalytic degradation effect, and together with the low surface energy resin and the micro-nano structure of each powder structure in the system, the coating has a high self-cleaning property for organic and inorganic substances, thereby avoiding the adhesion and accumulation of organic pollutants during long-term outdoor use.

[0044] (3) The synergistic effect between the various components in the present invention constructs a surface micro-nano rough structure, making the coating surface super hydrophobic, which can easily remove surface dirt in rainy weather and achieve high self-cleaning properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a scanning electron microscope image of the two-component fluororesin-based anti-pollution flashover coating prepared in Example 2 of the present invention. DETAILED DESCRIPTION

[0046] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0047] As mentioned above, current RTV coatings have the following problems: (1) Due to the easy light aging characteristics of silicone materials, the hydrophobicity and anti-fouling properties gradually decrease after long-term use in the atmosphere, and the sustained effective effect is not strong. The current statistical validity period is mostly 5 to 8 years; (2) Due to the hydrophobic and lipophilic properties of silicone rubber coatings themselves, the deposition of organic pollutants cannot be avoided. In the case of poor mobility, it is easy to form large contact angle water droplets on the surface, which reduces the insulation performance and increases the probability of flashover; (3) The hydrophobicity of organic substances is contradictory to the anti-fouling performance, that is, while improving the anti-fouling performance, the hydrophobicity and hydrophobic migration performance may be reduced.

[0048] Therefore, developing an anti-fouling flashover coating that has strong aging resistance, super hydrophobicity, and high self-cleaning properties has important scientific significance and application value.

[0049] In a specific embodiment of the present invention, a two-component fluororesin-based anti-pollution flashover coating is provided, comprising component A and component B; wherein component A comprises the following raw materials in parts by weight: 100 parts of fluororesin, 65 to 90 parts of filler, 10 to 15 parts of flame retardant, 1 to 3 parts of other additives, and 100 parts of dispersing solvent; component B comprises 20 to 25 parts of curing agent.

[0050] In another specific embodiment of the present invention, the fluororesin is a mixture of a copolymer resin of tetrafluoroethylene and an alkyl vinyl ester and a copolymer resin of chlorotrifluoroethylene and an alkyl vinyl ester.

[0051] In another specific embodiment of the present invention, the filler includes nano-sized silicon dioxide, micron-sized silicon dioxide, and nano-sized titanium dioxide;

[0052] Among them, the particle size of the nano-scale silicon dioxide is 20-35nm, and the surface is treated with KH550 silane coupling agent; the particle size of the micron-scale silicon dioxide is 2-5um, and the surface is treated with KH550 silane coupling agent; the particle size of the nano-scale titanium dioxide is 80-120nm, and the surface is treated with KH550 silane coupling agent.

[0053] In another specific embodiment of the present invention, the flame retardant is selected from one or more of ammonium polyphosphate and aluminum oxide.

[0054] In another specific embodiment of the present invention, the other additives include defoamers, leveling agents, wetting and dispersing agents, and adhesion promoters;

[0055] Wherein, the defoaming agent is a mixture of BYK066 and BYK054; further preferably, the ratio of BYK066 to BYK054 is 1:1;

[0056] The leveling agent is BYK358N; the wetting and dispersing agent is BYK110; and the adhesion promoter is BYK4510.

[0057] In another specific embodiment of the present invention, the dispersing solvent is a mixture of ethyl acetate and butyl acetate.

[0058] In another specific embodiment of the present invention, the curing agent is a polyisocyanate curing agent; further preferably, the curing agent is selected from one or more of hexamethylene diisocyanate HDI and diphenylmethane diisocyanate MDI.

[0059] In another specific embodiment of the present invention, a method for preparing the above-mentioned two-component fluororesin-based anti-pollution flashover coating is provided, comprising the following steps:

[0060] S1, mixing nano-sized silicon dioxide, micron-sized silicon dioxide and nano-sized titanium dioxide to prepare a filler;

[0061] S2, adding the filler into a mixture of butyl acetate and ethyl acetate to prepare a dispersion;

[0062] S3, adding a copolymer resin of tetrafluoroethylene and an alkyl vinyl ester and a copolymer resin of chlorotrifluoroethylene and an alkyl vinyl ester to the dispersion, followed by heating for reaction to obtain a fluororesin dispersion;

[0063] S4, mixing fluororesin dispersion, flame retardant, defoamer, leveling agent, wetting dispersant and adhesion promoter to obtain two-component fluororesin-based anti-fouling flashover coating component A;

[0064] S5. Mix component A of the two-component fluororesin-based anti-pollution flashover coating with a curing agent to obtain the two-component fluororesin-based anti-pollution flashover coating.

[0065] In another specific embodiment of the present invention, in step S1, the weight ratio of the nano-scale silicon dioxide, micron-scale silicon dioxide and nano-scale titanium dioxide is 25-35:30-40:10-15.

[0066] In another specific embodiment of the present invention, in step S2, the fraction ratio of ethyl acetate to butyl acetate is 3:7.

[0067] In another specific embodiment of the present invention, in step S3, the viscosity of the copolymer resin of tetrafluoroethylene and alkyl vinyl ester is 5000-6000 mPa.S, accounting for 40%-60% of the mass ratio of the fluororesin, and the viscosity of the copolymer resin of chlorotrifluoroethylene and alkyl vinyl ester is 5000-6000 mPa.S, accounting for 40%-60% of the mass ratio of the fluororesin.

[0068] In another specific embodiment of the present invention, in step S3, the temperature of the heating reaction is 95-115° C., and the heating reaction time is 0.5 h-1.5 h.

[0069] In another specific embodiment of the present invention, the temperature of the heating reaction is 105° C., and the heating reaction time is 1 hour.

[0070] In another specific embodiment of the present invention, there is provided a use of the above-mentioned two-component fluororesin-based anti-pollution flashover coating on the surface of power equipment and insulators.

[0071] In another specific embodiment of the present invention, a method for using the above-mentioned two-component fluororesin-based anti-pollution flashover coating in power equipment is provided, and the steps are as follows:

[0072] (1) Clean and dry the surface of the electrical equipment;

[0073] (2) mixing component A and component B of a two-component fluororesin-based anti-pollution flashover coating, and then applying the mixture on the surface of the power equipment;

[0074] (3) After the coating is completely cured, an effective protective coating is obtained.

[0075] In another specific embodiment of the present invention, the coating method is selected from one of air spraying, airless spraying and brushing;

[0076] In another specific embodiment of the present invention, the curing time is 20 to 24 hours.

[0077] In another specific embodiment of the present invention, a method for using the above-mentioned two-component fluororesin-based anti-pollution flashover coating on the surface of an insulator is provided, and the steps are as follows:

[0078] (1) Clean and dry the surface of the insulator;

[0079] (2) Mixing component A and component B of a two-component fluororesin-based anti-pollution flashover coating, and then applying the mixture on the surface of the insulator;

[0080] (3) After the coating is completely cured, an effective protective coating is obtained.

[0081] In another specific embodiment of the present invention, the coating method is selected from one of air spraying, airless spraying and brushing.

[0082] In another specific embodiment of the present invention, the curing time is 20 to 24 hours.

[0083] The present invention will be further described in detail below in conjunction with specific embodiments. It should be noted that the specific embodiments are intended to explain the present invention rather than to limit it.

[0084] Example 1 : This embodiment provides a two-component fluororesin-based anti-pollution flashover coating and a preparation method thereof.

[0085] Coating formula:

[0086] Component A: 100 parts of fluororesin (50 parts of 5500mP.S. copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500mP.S. copolymer resin of chlorotrifluoroethylene and alkyl vinyl ester), 65 parts of filler (25 parts of 35nm nano-scale silica, 30 parts of 3um micron-scale silica, 10 parts of 100nm nano-scale titanium dioxide), 10 parts of flame retardant (5 parts of ammonium polyphosphate and 5 parts of alumina), 3 parts of other additives (0.6 parts of defoamer, 0.4 parts of leveling agent, 1 part of wetting dispersant, 1 part of adhesion promoter), 100 parts of dispersing solvent;

[0087] Component B: 25 parts of curing agent.

[0088] The coating preparation method comprises the following steps:

[0089] (1) weighing a mixture of butyl acetate and ethyl acetate in proportion, and first stirring and mixing them uniformly;

[0090] (2) adding nano-scale silicon dioxide, micron-scale silicon dioxide and nano-scale titanium dioxide weighed in proportion to the stirred (1) in sequence until the mixture is completely wetted and free of lumps;

[0091] (3) Grinding and dispersing the prepared (2) in a nano-horizontal grinder for 0.5 h;

[0092] (4) Continue to stir and disperse the prepared dispersion (3), then add 50 parts of 5500 mP.S of a copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500 mP.S of a copolymer resin of trifluorochloroethylene and alkyl vinyl ester, and continue to stir and disperse for 1 hour;

[0093] (5) The prepared (4) was transferred to a heating reaction kettle for heating and stirring at a heating temperature of 105° C. The stirring and dispersion treatment lasted for 1 hour;

[0094] (6) moving the prepared (5) to room temperature dry conditions (humidity <50%), adding flame retardants and other additives, continuing to stir and disperse until reaching room temperature, filling and sealing for standby use, and obtaining a two-component fluororesin-based anti-fouling flashover coating component A;

[0095] (7) Component A and component B of a two-component fluororesin-based anti-pollution flashover coating are mixed to obtain a two-component fluororesin-based anti-pollution flashover coating.

[0096] Example 2 : This embodiment provides a two-component fluororesin-based anti-pollution flashover coating and a preparation method thereof.

[0097] Coating formula:

[0098] Component A: 100 parts of fluororesin (50 parts of 5500mP.S copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500mP.S copolymer resin of chlorotrifluoroethylene and alkyl vinyl ester), 70 parts of filler (25 parts of 35nm nano-scale silica, 35 parts of 3um micron-scale silica, 10 parts of 100nm nano-scale titanium dioxide), 10 parts of flame retardant (5 parts of ammonium polyphosphate and 5 parts of aluminum oxide), 3 parts of other additives (0.6 parts of defoamer, 0.4 parts of leveling agent, 1 part of wetting dispersant, 1 part of adhesion promoter), 100 parts of dispersing solvent;

[0099] Component B: 25 parts of curing agent.

[0100] The coating preparation method comprises the following steps:

[0101] (1) weighing a mixture of butyl acetate and ethyl acetate in proportion, and first stirring and mixing them uniformly;

[0102] (2) adding nano-scale silicon dioxide, micron-scale silicon dioxide and nano-scale titanium dioxide weighed in proportion to the stirred (1) in sequence until the mixture is completely wetted and free of lumps;

[0103] (3) Grinding and dispersing the prepared (2) in a nano-horizontal grinder for 0.5 h;

[0104] (4) Continue to stir and disperse the prepared dispersion (3), then add 50 parts of 5500 mP.S of a copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500 mP.S of a copolymer resin of trifluorochloroethylene and alkyl vinyl ester, and continue to stir and disperse for 1 hour;

[0105] (5) The prepared (4) was transferred to a heating reaction kettle for heating and stirring at a heating temperature of 105° C. The stirring and dispersion treatment lasted for 1 hour;

[0106] (6) moving the prepared (5) to room temperature dry conditions (humidity <50%), adding flame retardants and other additives, continuing to stir and disperse until reaching room temperature, filling and sealing for standby use, and obtaining a two-component fluororesin-based anti-fouling flashover coating component A;

[0107] (7) Component A and component B of a two-component fluororesin-based anti-pollution flashover coating are mixed to obtain a two-component fluororesin-based anti-pollution flashover coating.

[0108] Example 3 : This embodiment provides a two-component fluororesin-based anti-pollution flashover coating and a preparation method thereof.

[0109] Coating formula:

[0110] The components are: 100 parts of fluororesin (50 parts of 5500mP.S copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500mP.S copolymer resin of chlorotrifluoroethylene and alkyl vinyl ester), 75 parts of filler (30 parts of 35nm nano-scale silica, 35 parts of 3um micron-scale silica, 10 parts of 100nm nano-scale titanium dioxide), 10 parts of flame retardant (5 parts of ammonium polyphosphate and 5 parts of aluminum oxide), 3 parts of other additives (0.6 parts of defoamer, 0.4 parts of leveling agent, 1 part of wetting dispersant, 1 part of adhesion promoter), 100 parts of dispersing solvent;

[0111] Component B: 25 parts of curing agent.

[0112] The coating preparation method comprises the following steps:

[0113] (1) weighing a mixture of butyl acetate and ethyl acetate in proportion, and first stirring and mixing them uniformly;

[0114] (2) adding nano-scale silicon dioxide, micron-scale silicon dioxide and nano-scale titanium dioxide weighed in proportion to the stirred (1) in sequence until the mixture is completely wetted and free of lumps;

[0115] (3) Grinding and dispersing the prepared (2) in a nano-horizontal grinder for 0.5 h;

[0116] (4) Continue to stir and disperse the prepared dispersion (3), then add 50 parts of 5500 mP.S of a copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500 mP.S of a copolymer resin of trifluorochloroethylene and alkyl vinyl ester, and continue to stir and disperse for 1 hour;

[0117] (5) The prepared (4) was transferred to a heating reaction kettle for heating and stirring at a heating temperature of 105° C. The stirring and dispersion treatment lasted for 1 hour;

[0118] (6) moving the prepared (5) to room temperature dry conditions (humidity <50%), adding flame retardants and other additives, continuing to stir and disperse until reaching room temperature, filling and sealing for standby use, and obtaining a two-component fluororesin-based anti-fouling flashover coating component A;

[0119] (7) Component A and component B of a two-component fluororesin-based anti-pollution flashover coating are mixed to obtain a two-component fluororesin-based anti-pollution flashover coating.

[0120] Example 4 : This embodiment provides a two-component fluororesin-based anti-pollution flashover coating and a preparation method thereof.

[0121] Coating formula:

[0122] Component A: 100 parts of fluororesin (50 parts of 5500mP.S copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500mP.S copolymer resin of chlorotrifluoroethylene and alkyl vinyl ester), 80 parts of filler (30 parts of 35nm nano-scale silica, 35 parts of 3um micron-scale silica, 15 parts of 100nm nano-scale titanium dioxide), 10 parts of flame retardant (5 parts of ammonium polyphosphate and 5 parts of alumina), 3 parts of other additives (0.6 parts of defoamer, 0.4 parts of leveling agent, 1 part of wetting dispersant, 1 part of adhesion promoter), 100 parts of dispersing solvent;

[0123] Component B: 25 parts of curing agent.

[0124] The coating preparation method comprises the following steps:

[0125] (1) weighing a mixture of butyl acetate and ethyl acetate in proportion, and first stirring and mixing them uniformly;

[0126] (2) adding nano-scale silicon dioxide, micron-scale silicon dioxide and nano-scale titanium dioxide weighed in proportion to the stirred (1) in sequence until the mixture is completely wetted and free of lumps;

[0127] (3) Grinding and dispersing the prepared (2) in a nano-horizontal grinder for 0.5 h;

[0128] (4) Continue to stir and disperse the prepared dispersion (3), then add 50 parts of 5500 mP.S of a copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500 mP.S of a copolymer resin of trifluorochloroethylene and alkyl vinyl ester, and continue to stir and disperse for 1 hour;

[0129] (5) The prepared (4) was transferred to a heating reaction kettle for heating and stirring at a heating temperature of 105° C. The stirring and dispersion treatment lasted for 1 hour;

[0130] (6) moving the prepared (5) to room temperature dry conditions (humidity <50%), adding flame retardants and other additives, continuing to stir and disperse until reaching room temperature, filling and sealing for standby use, and obtaining a two-component fluororesin-based anti-fouling flashover coating component A;

[0131] (7) Component A and component B of a two-component fluororesin-based anti-pollution flashover coating are mixed to obtain a two-component fluororesin-based anti-pollution flashover coating.

[0132] Example 5 : This embodiment provides a two-component fluororesin-based anti-pollution flashover coating and a preparation method thereof.

[0133] Coating formula:

[0134] Component A: 100 parts of fluororesin (50 parts of 5500mP.S. copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500mP.S. copolymer resin of chlorotrifluoroethylene and alkyl vinyl ester), 85 parts of filler (35 parts of 35nm nano-scale silica, 35 parts of 3um micron-scale silica, 15 parts of 100nm nano-scale titanium dioxide), 10 parts of flame retardant (5 parts of ammonium polyphosphate and 5 parts of alumina), 3 parts of other additives (0.6 parts of defoamer, 0.4 parts of leveling agent, 1 part of wetting dispersant, 1 part of adhesion promoter), 100 parts of dispersing solvent;

[0135] Component B: 25 parts of curing agent.

[0136] The coating preparation method comprises the following steps:

[0137] (1) weighing a mixture of butyl acetate and ethyl acetate in proportion, and first stirring and mixing them uniformly;

[0138] (2) adding nano-scale silicon dioxide, micron-scale silicon dioxide and nano-scale titanium dioxide weighed in proportion to the stirred (1) in sequence until the mixture is completely wetted and free of lumps;

[0139] (3) Grinding and dispersing the prepared (2) in a nano-horizontal grinder for 0.5 h;

[0140] (4) Continue to stir and disperse the prepared dispersion (3), then add 50 parts of 5500 mP.S of a copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500 mP.S of a copolymer resin of trifluorochloroethylene and alkyl vinyl ester, and continue to stir and disperse for 1 hour;

[0141] (5) The prepared (4) was transferred to a heating reaction kettle for heating and stirring at a heating temperature of 105° C. The stirring and dispersion treatment lasted for 1 hour;

[0142] (6) moving the prepared (5) to room temperature dry conditions (humidity <50%), adding flame retardants and other additives, continuing to stir and disperse until reaching room temperature, filling and sealing for standby use, and obtaining a two-component fluororesin-based anti-fouling flashover coating component A;

[0143] (7) Component A and component B of a two-component fluororesin-based anti-pollution flashover coating are mixed to obtain a two-component fluororesin-based anti-pollution flashover coating.

[0144] Example 6 : This embodiment provides a two-component fluororesin-based anti-pollution flashover coating and a preparation method thereof.

[0145] Coating formula:

[0146] Component A: 100 parts of fluororesin (50 parts of 5500mP.S copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500mP.S copolymer resin of chlorotrifluoroethylene and alkyl vinyl ester), 90 parts of filler (35 parts of 35nm nano-scale silica, 40 parts of 3um micron-scale silica, 15 parts of 100nm nano-scale titanium dioxide), 10 parts of flame retardant (5 parts of ammonium polyphosphate and 5 parts of alumina), 3 parts of other additives (0.6 parts of defoamer, 0.4 parts of leveling agent, 1 part of wetting dispersant, 1 part of adhesion promoter), 100 parts of dispersing solvent;

[0147] Component B: 25 parts of curing agent.

[0148] The coating preparation method comprises the following steps:

[0149] (1) weighing a mixture of butyl acetate and ethyl acetate in proportion, and first stirring and mixing them uniformly;

[0150] (2) adding nano-scale silicon dioxide, micron-scale silicon dioxide and nano-scale titanium dioxide weighed in proportion to the stirred (1) in sequence until the mixture is completely wetted and free of lumps;

[0151] (3) Grinding and dispersing the prepared (2) in a nano-horizontal grinder for 0.5 h;

[0152] (4) Continue to stir and disperse the prepared dispersion (3), then add 50 parts of 5500 mP.S of a copolymer resin of tetrafluoroethylene and alkyl vinyl ester and 50 parts of 5500 mP.S of a copolymer resin of trifluorochloroethylene and alkyl vinyl ester, and continue to stir and disperse for 1 hour;

[0153] (5) The prepared (4) was transferred to a heating reaction kettle for heating and stirring at a heating temperature of 105° C. The stirring and dispersion treatment lasted for 1 hour;

[0154] (6) moving the prepared (5) to room temperature dry conditions (humidity <50%), adding flame retardants and other additives, continuing to stir and disperse until reaching room temperature, filling and sealing for standby use, and obtaining a two-component fluororesin-based anti-fouling flashover coating component A;

[0155] (7) Component A and component B of a two-component fluororesin-based anti-pollution flashover coating are mixed to obtain a two-component fluororesin-based anti-pollution flashover coating.

[0156] Comparative Example 1 :

[0157] The difference from Example 1 is that no nano-silicon dioxide is added in step (2).

[0158] Comparative Example 2 :

[0159] The difference from Example 2 is that nano-silicon dioxide and micro-silicon dioxide are not added in step (2).

[0160] Comparative Example 3 :

[0161] The difference from Example 3 is that nano titanium dioxide is not added in step (2).

[0162] Comparative Example 4 :

[0163] The difference from Example 1 is that component A contains 65 parts of filler (25 parts of 35nm nano-sized silicon dioxide, 30 parts of 3um micro-sized silicon dioxide, and 10 parts of micro-sized titanium dioxide).

[0164] Comparative Example 5 :

[0165] Different from Example 4, no flame retardant is added in step (6).

[0166] Comparative Example 6 :

[0167] Different from Example 5, no other auxiliary agent is added in step (6).

[0168] Comparative Example 7 :

[0169] Different from Example 6, the fluororesin in step (4) is only added with a copolymer resin of tetrafluoroethylene and alkyl vinyl ester.

[0170] Test Example 1 :

[0171] This embodiment provides coating preparation and performance testing of a two-component fluororesin-based anti-pollution flashover coating prepared in Examples 1 to 6 and Comparative Examples 1 to 6.

[0172] Coating preparation method: Prepare insulators with a clean and dry surface. After thoroughly mixing the above-mentioned coating components A and B, apply them to the surface of the insulators by air spraying. After curing and maintaining for 24 hours at room temperature (25°C, 50% < RH < 85%), a protective coating of 200 μm is obtained.

[0173] Performance testing: The hydrophobic angle and rolling angle are tested by static water contact angle; the flame retardant grade is tested by the vertical burning method; the aging resistance is tested by ultraviolet light irradiation with a wavelength of 340 nm, and the time of color change, peeling, and shedding is observed. Observe once every 24 hours; the self-cleaning property is tested by the glass bead method; the adhesion is tested by the scribing method.

[0174] The specific performance parameters are shown in Table 1 and Table 2:

[0175] Table 1 Performance test results of the examples

[0176] Example 1 2 3 4 5 6 Hydrophobic angle / ° 140 145 152 156 160 163 Roll angle / ° 9 9 7 7 3 3 Flame retardant grade FV-0 FV-0 FV-0 FV-0 FV-0 FV-0 Aging resistance 1500 1500 1500 1500 1500 1500 Self-cleaning 2 2 2 1 1 1 Adhesion 1 1 1 2 2 2

[0177] Table 2 Performance test results of the comparative examples

[0178] Comparative Example 1 2 3 4 5 6 7 Hydrophobic angle / ° 128 110 135 130 149 157 148 Roll angle / ° >20 >30 >15 >15 12 4 10 Flame retardant grade FV-1 FV-2 FV-1 FV-1 FV-2 FV-1 FV-2 Aging resistance 1300 1100 1000 1000 1450 1400 1380 Self-cleaning 3 3 3 3 1 2 3 Adhesion 1 1 1 2 2 2 3

[0179] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A two-component fluororesin-based anti-fouling flashover coating, comprising component A and component B; wherein: Component A comprises the following raw materials in weight fractions: 100 parts of fluororesin, 65-90 parts of filler, 10-15 parts of flame retardant, 1-3 parts of other auxiliary agents, and 100 parts of dispersing solvent; component B comprises 20-25 parts of curing agent.

2. The two-component fluororesin-based anti-pollution flashover coating according to claim 1, characterized in that: The fluororesin is a mixture of a copolymer resin of tetrafluoroethylene and an alkyl vinyl ester and a copolymer resin of chlorotrifluoroethylene and an alkyl vinyl ester; the filler comprises nano-scale silicon dioxide, micron-scale silicon dioxide, and nano-scale titanium dioxide; the flame retardant is selected from one or more of ammonium polyphosphate and alumina; and the other additives include a defoamer, a leveling agent, a wetting dispersant, and an adhesion promoter.

3. The two-component fluororesin-based anti-pollution flashover coating according to claim 2, characterized in that: The particle size of the nano-scale silicon dioxide is 20-35 nm, and the surface is treated with KH550 silane coupling agent; the particle size of the micron-scale silicon dioxide is 2-5 μm, and the surface is treated with KH550 silane coupling agent; the particle size of the nano-scale titanium dioxide is 80-120 nm, and the surface is treated with KH550 silane coupling agent; The defoaming agent is a mixture of BYK066 and BYK054; preferably, the ratio of BYK066 to BYK054 is 1:1; the leveling agent is BYK358N; the wetting and dispersing agent is BYK110; and the adhesion promoter is BYK4510.

4. The two-component fluororesin-based anti-pollution flashover coating according to claim 1, characterized in that: The dispersing solvent is a mixture of ethyl acetate and butyl acetate; the curing agent is a polyisocyanate curing agent; preferably, the curing agent is selected from one or more of hexamethylene diisocyanate HDI and diphenylmethane diisocyanate MDI.

5. A method for preparing a two-component fluororesin-based anti-pollution flashover coating according to any one of claims 1 to 4, characterized in that: The steps include: S1, mixing nano-sized silicon dioxide, micron-sized silicon dioxide and nano-sized titanium dioxide to prepare a filler; S2, adding the filler into a mixture of butyl acetate and ethyl acetate to prepare a dispersion; S3, adding a copolymer resin of tetrafluoroethylene and an alkyl vinyl ester and a copolymer resin of chlorotrifluoroethylene and an alkyl vinyl ester to the dispersion, followed by heating for reaction to obtain a fluororesin dispersion; S4, mixing fluororesin dispersion, flame retardant, defoamer, leveling agent, wetting dispersant and adhesion promoter to obtain two-component fluororesin-based anti-fouling flashover coating component A; S5. Mix component A of the two-component fluororesin-based anti-pollution flashover coating with a curing agent to obtain the two-component fluororesin-based anti-pollution flashover coating.

6. The preparation method according to claim 5, characterized in that: In step S1, the weight ratio of the nano-scale silicon dioxide, micron-scale silicon dioxide, and nano-scale titanium dioxide is 25-35:30-40:10-15; In step S2, the fraction ratio of ethyl acetate to butyl acetate is 3:7; In step S3, the viscosity of the copolymer resin of tetrafluoroethylene and alkyl vinyl ester is 5000-6000 mPa.S, accounting for 40%-60% of the mass ratio of the fluororesin, and the viscosity of the copolymer resin of chlorotrifluoroethylene and alkyl vinyl ester is 5000-6000 mPa.S, accounting for 40%-60% of the mass ratio of the fluororesin.

7. The preparation method according to claim 5, characterized in that: In step S3, the temperature of the heating reaction is 95-115° C., and the heating reaction time is 0.5 h-1.5 h; preferably, the temperature of the heating reaction is 105° C., and the heating reaction time is 1 h.

8. Use of the two-component fluororesin-based anti-pollution flashover coating according to any one of claims 1 to 4 on the surface of power equipment and insulators.

9. A method for using the two-component fluororesin-based anti-pollution flashover coating according to any one of claims 1 to 4 in power equipment, comprising the following steps: (1) Clean and dry the surface of the electrical equipment; (2) mixing component A and component B of a two-component fluororesin-based anti-pollution flashover coating, and then applying the mixture on the surface of the power equipment; (3) After the coating is completely cured, an effective protective coating is obtained. Preferably, the coating method is selected from one of air spraying, airless spraying and brushing; Preferably, the curing time is 20 to 24 hours.

10. A method for using the two-component fluororesin-based anti-pollution flashover coating according to any one of claims 1 to 4 on the surface of an insulator, comprising the following steps: (1) Clean and dry the surface of the insulator; (2) Mixing component A and component B of a two-component fluororesin-based anti-pollution flashover coating, and then applying the mixture on the surface of the insulator; (3) After the coating is completely cured, an effective protective coating is obtained. Preferably, the coating method is selected from one of air spraying, airless spraying and brushing. Preferably, the curing time is 20 to 24 hours.

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