High-self-cleaning weather-resistant GRTV insulating coating for electrical equipment

Abstract

The invention discloses a high-self-cleaning weather-resistant GRTV insulating coating for electrical equipment, which comprises the following components: a film-forming agent consisting of solvent-type fluororesin, hydroxyl-terminated polysiloxane, acrylic resin and polyether polyol, a reinforcing agent consisting of at least two of MQ silicon resin, silicon dioxide, silicon nitride and fluororesin micro powder, a filling agent consisting of aluminum oxide, a curing agent consisting of a curing agent and a solvent, the curing agent is composed of two or three components of tetraethoxysilane, methyltriacetamide silane, dimethyl diacetamide silane or dibutyltin oxide, and trichloroethylene or butyl acetate is used as an organic solvent; the anti-pollution flashover coating is good in adhesive force, excellent in electrical insulation performance, good in hydrophobicity, high in anti-pollution flashover capacity, excellent in mildew resistance, algae resistance and anti-burst scattering characteristic, good in self-cleaning performance and capable of better exerting the anti-pollution flashover efficiency under the conditions of high salinity, high humidity and heavy pollution, and the insulation strength is not affected by environment temperature and moisture.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and relates to an insulating coating, in particular to a high self-cleaning and weather-resistant GRTV insulating coating for electrical equipment. Background Art

[0002] Factory electrification, urban lighting, residential life, travel electrification, and the currently rapidly developing artificial intelligence computing technology all require a large amount of electrical energy. The comprehensive development of electrical energy involves many aspects such as power sources, grids, loads, and energy storage. High-voltage, extra-high-voltage, and ultra-high-voltage power transmission and transformation transmit electrical energy from the production end to the user end through high-altitude and long-distance transmission. One of the key technologies for electrical energy transmission under atmospheric conditions is the insulation and external insulation problems of the power system.

[0003] Ceramics and tempered glass, as classic insulating materials, and insulating devices and insulators made of various types of synthetic resins have solved the internal insulation problems required by the power system. However, due to the external insulation being in various harsh and changing atmospheric environments, its safety, reliability, and durability have not been effectively solved. Currently, in the power system, the commonly used external insulation coating is room temperature vulcanized silicone rubber anti-fouling flashover coating (i.e., RTV type coating or RTV type material). However, due to the vast geographical area spanned by power transmission, complex geographical environments, uneven development levels, and diverse operating environments of electrical equipment, the commonly used room temperature vulcanized silicone rubber anti-fouling flashover coating is prone to aging and even failure, and there are problems with its use effect and lifespan, unable to meet the requirements for the safe operation of the power system. For example, in a high-humidity environment, molds, green algae, and moss grow on the insulating surface of electrical equipment, not only reducing the external insulation performance but also shortening the equipment lifespan due to corrosion and aging; near calcite powder and calcium carbonate powder processing plants, the conventional anti-fouling flashover coating on electrical insulators is severely soiled, with a fouling accumulation greater than 2 mg / cm 2 2, which is difficult to clean thoroughly, and abnormal discharges often occur after the fouling absorbs moisture; in coastal areas, after the electrical insulators are coated with the conventional anti-fouling flashover coating, the salt accumulation is even more serious than that of uncoated insulators, and due to the influence of humid salt spray, local peeling will occur on the coating within less than 2 years, and the uneven electric field distribution on the mottled insulator surface poses a greater risk of failure; in a strong ultraviolet environment with occasional sandstorms, the conventional anti-fouling flashover coating on electrical insulators is prone to defects such as powdering and peeling; near the step-up substation of a thermal power plant, after the insulators are coated with the conventional anti-fouling flashover coating, "oily" dirt adheres to the surface, making the surface sticky and losing its hydrophobicity, and discharges occur under the moisture shroud of the cooling tower; in a substation located in a warm, humid, and vegetation-rich area, the circuit breakers coated with the conventional anti-fouling flashover coating often grow fouling such as algae. Due to moisture absorption and uneven salt distribution, electric field distortion occurs, leading to equipment explosion accidents.

[0004] In view of the differences in the above application environments, it is urgent to optimize and improve the existing RTV coatings to enhance their self-cleaning ability and service life, and meet the requirements of various complex environments. That is, it is necessary to develop a highly self-cleaning and weather-resistant RTV coating, namely GRTV coating. Summary of the Invention

[0005] The object of the present invention is to provide a highly self-cleaning and weather-resistant GRTV insulating coating for electrical equipment, which can have strong insulation performance, self-cleaning performance, weather resistance, water repellency, adhesion performance, corrosion resistance, as well as mildew and algae resistance and explosion-proof and anti-scattering characteristics, providing high-reliability external insulation ability for the insulators in the power system.

[0006] The technical solution adopted by the present invention provides a highly self-cleaning and weather-resistant GRTV insulating coating for electrical equipment. The key lies in that, by mass fraction, the components of the above insulating coating include a film-forming agent composed of 10 parts to 60 parts of solvent-based fluororesin, 10 parts to 70 parts of hydroxyl-terminated polysiloxane, 5 parts to 50 parts of acrylic resin, and 0 part to 15 parts of polyether polyol; a reinforcing agent composed of at least two components selected from 0 part to 20 parts of MQ silicone resin, 10 parts to 35 parts of silicon dioxide, 0 part to 20 parts of silicon nitride, and 0 part to 25 parts of fluororesin micropowder; a filler composed of 30 parts to 70 parts of aluminum oxide, 3 parts to 10 parts of coupling agent, a curing agent composed of two or three components selected from 0 part to 10 parts of tetraethyl orthosilicate, 0 part to 7 parts of methyltriethoxysilane, 0 part to 3 parts of dimethyldiethoxysilane, or 0 part to 2 parts of dibutyltin oxide, 0.5 part to 2 parts of light stabilizer, 0.1 part to 9 parts of mildew and antibacterial agent, and 50 parts to 100 parts of trichloroethylene or 50 parts to 120 parts of butyl acetate as organic solvents; the above filler also includes any two or three of 0 part to 50 parts of magnesium oxide, 0 part to 20 parts of zinc oxide, 0 part to 15 parts of titanium dioxide, or 0 part to 30 parts of calcium carbonate.

[0007] Furthermore, the above coupling agent includes one or two of 3-(trimethoxysilyl)propyl acrylate, γ-aminopropyltrimethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane; by mass fraction, the above organic solvents also include 20 parts to 30 parts of n-hexane or 30 parts to 50 parts of 120# solvent oil; the above light stabilizer is any one or combination of triazine ultraviolet absorber UV-405 or benzotriazole ultraviolet absorber UV-328; the above mildew and antibacterial agent is at least one of p-hydroxybenzoate, potassium sorbate, and fly ash; the above insulating coating also includes pigments.

[0008] Specifically, by mass parts, the film-forming agent in the above-mentioned insulating paint consists of 10 parts to 30 parts of solvent-based fluororesin, 40 parts to 70 parts of hydroxy-terminated polysiloxane, 5 parts to 15 parts of acrylic resin, and 5 parts to 15 parts of polyether polyol; the reinforcing agent consists of 10 parts to 20 parts of MQ silicone resin, 10 parts to 30 parts of silicon dioxide, 0 parts to 10 parts of silicon nitride, and 5 parts to 15 parts of fluororesin micropowder; the filler consists of 30 parts to 50 parts of aluminum oxide, 10 parts to 20 parts of zinc oxide, and 5 parts to 15 parts of titanium dioxide; the coupling agent consists of 3 parts to 5 parts of 3-(trimethoxysilyl)propyl acrylate and 1 part to 3 parts of γ-aminopropyltrimethoxysilane; the light stabilizer is 0.5 part to 2 parts of triazine ultraviolet absorber UV-405; the mildew and antibacterial agent is 0.1 part to 0.3 part of potassium sorbate; the curing agent consists of 3 parts to 7 parts of methyltriethylamide silane, 1 part to 3 parts of dimethyldiethylamide silane, and 0.2 part to 1 part of dibutyltin oxide; the organic solvent consists of 30 parts to 50 parts of 120# solvent oil and 50 parts to 100 parts of trichloroethylene. The insulating paint prepared from the above components has excellent high self-cleaning weather resistance and can be named "GRTV-I type" insulating paint or "GRTV-I self-cleaning and anti-fouling type" insulating paint.

[0009] Specifically, by mass parts, the film-forming agent in the above-mentioned insulating paint consists of 30 parts to 60 parts of solvent-based fluororesin, 20 parts to 50 parts of hydroxy-terminated polysiloxane, 5 parts to 15 parts of acrylic resin, and 0 parts to 5 parts of polyether polyol; the reinforcing agent consists of 10 parts to 30 parts of silicon dioxide and 10 parts to 25 parts of fluororesin micropowder; the filler consists of 30 parts to 50 parts of aluminum oxide, 5 parts to 15 parts of magnesium oxide, and 20 parts to 30 parts of calcium carbonate; the coupling agent is 3 parts to 8 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane; the light stabilizer is 0.5 part to 2 parts of triazine ultraviolet absorber UV-405; the mildew and antibacterial agent consists of 1 part to 3 parts of p-hydroxybenzoate, 3 parts to 8 parts of fly ash, and 0 parts to 1 part of potassium sorbate; the curing agent consists of 3 parts to 7 parts of methyltriethylamide silane, 1 part to 3 parts of dimethyldiethylamide silane, and 0.2 part to 1 part of dibutyltin oxide; the organic solvent is 60 parts to 100 parts of trichloroethylene. The insulating paint prepared from the above components has outstanding mildew, antibacterial, and anti-algae characteristics and can be named "GRTV-II type" insulating paint or "GRTV-II mildew, antibacterial, and anti-algae type" insulating paint.

[0010] Specifically, by mass parts, the film-forming agent in the above-mentioned insulating coating consists of 20 to 50 parts of solvent-based fluororesin, 10 to 30 parts of hydroxyl-terminated polysiloxane, 15 to 30 parts of acrylic resin, and 5 to 15 parts of polyether polyol; the reinforcing agent consists of 10 to 20 parts of MQ silicone resin, 15 to 35 parts of silicon dioxide, and 5 to 20 parts of silicon nitride; the filler consists of 40 to 70 parts of aluminum oxide, 5 to 15 parts of zinc oxide, 5 to 15 parts of titanium dioxide, and 10 to 30 parts of calcium carbonate; the coupling agent consists of 2 to 5 parts of γ-aminopropyltrimethoxysilane and 3 to 8 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane; the light stabilizer is 0.5 to 2 parts of benzotriazole ultraviolet absorber UV-328; the mildew and antibacterial agent is 0.1 to 0.3 parts of potassium sorbate; the curing agent consists of 5 to 10 parts of tetraethyl orthosilicate and 0.5 to 2 parts of dibutyltin oxide; the organic solvent consists of 20 to 30 parts of n-hexane and 70 to 120 parts of butyl acetate; the insulating coating prepared from the above components has excellent anti-explosion and anti-scattering characteristics and can be named "GRTV-FB type" insulating coating or "GRTV-Ⅲ type" insulating coating or "GRTV-FB anti-explosion and anti-scattering type" insulating coating or "GRTV-Ⅲ anti-explosion and anti-scattering type" insulating coating.

[0011] Specifically, by mass parts, the film-forming agent in the above-mentioned insulating coating consists of 5 to 20 parts of solvent-based fluororesin, 40 to 70 parts of hydroxyl-terminated polysiloxane, 20 to 50 parts of acrylic resin, and 0 to 5 parts of polyether polyol; the reinforcing agent consists of 10 to 30 parts of silicon dioxide and 5 to 20 parts of silicon nitride; the filler consists of 40 to 70 parts of aluminum oxide, 20 to 50 parts of magnesium oxide, and 0 to 10 parts of titanium dioxide; the coupling agent consists of 1 to 3 parts of 3-(trimethoxysilyl)propyl acrylate and 3 to 5 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane; the light stabilizer is 0.5 to 2 parts of triazine ultraviolet absorber UV-405; the mildew and antibacterial agent is 0.1 to 0.3 parts of potassium sorbate; the curing agent consists of 3 to 7 parts of methyltriacetoxysilane, 1 to 3 parts of dimethyldiacetoxysilane, and 0.2 to 1 part of dibutyltin oxide; the organic solvent consists of 30 to 50 parts of 120# solvent oil and 50 to 100 parts of trichloroethylene; the insulating coating prepared from the above components has significant moisture-proof and insulation characteristics and can be named "GRTV-JY type" insulating coating or "GRTV-Ⅳ type" insulating coating or "GRTV-JY moisture-proof and insulation type" insulating coating or "GRTV-Ⅳ moisture-proof and insulation type" insulating coating.

[0012] Preferably, by mass parts, the film-forming agent in the above-mentioned insulating paint consists of 30 to 50 parts of solvent-based fluororesin, 30 to 50 parts of hydroxyl-terminated polysiloxane, 10 to 20 parts of acrylic resin, and 3 to 10 parts of polyether polyol; the reinforcing agent consists of 10 to 15 parts of MQ silicone resin, 15 to 20 parts of silica, 5 to 10 parts of silicon nitride, and 10 to 12 parts of fluororesin micropowder; the filler consists of 40 to 50 parts of aluminum oxide, 5 to 15 parts of zinc oxide, 10 to 15 parts of titanium dioxide, and 15 to 25 parts of calcium carbonate; the coupling agent consists of 2 to 5 parts of γ-aminopropyltrimethoxysilane and 4 to 8 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane; the light stabilizer consists of 0.5 to 1 part of benzotriazole ultraviolet absorber UV-328 and 0.5 to 1 part of triazine ultraviolet absorber UV-405; the mildew and antibacterial agent consists of 1 to 3 parts of p-hydroxybenzoate, 3 to 6 parts of fly ash, and 0.3 to 0.5 part of potassium sorbate; the curing agent consists of 4 to 7 parts of methyltriethylamide silane, 1 to 3 parts of dimethyldiethylamide silane, and 0.2 to 1 part of dibutyltin oxide; the organic solvent consists of 30 to 50 parts of 120# solvent oil and 50 to 90 parts of trichloroethylene.

[0013] Optimally, by mass parts, the film-forming agent in the above-mentioned insulating paint consists of 40 parts of solvent-based fluororesin, 45 parts of hydroxyl-terminated polysiloxane, 15 parts of acrylic resin, and 8 parts of polyether polyol; the reinforcing agent consists of 12 parts of MQ silicone resin, 18 parts of silica, 8 parts of silicon nitride, and 12 parts of fluororesin micropowder; the filler consists of 45 parts of aluminum oxide, 10 parts of zinc oxide, 15 parts of titanium dioxide, and 20 parts of calcium carbonate; the coupling agent consists of 3 parts of γ-aminopropyltrimethoxysilane and 6 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane; the light stabilizer consists of 0.8 part of benzotriazole ultraviolet absorber UV-328 and 0.8 part of triazine ultraviolet absorber UV-405; the mildew and antibacterial agent consists of 2 parts of p-hydroxybenzoate, 4 parts of fly ash, and 0.5 part of potassium sorbate; the curing agent consists of 6 parts of methyltriethylamide silane, 2 parts of dimethyldiethylamide silane, and 0.5 part of dibutyltin oxide; the organic solvent consists of 45 parts of 120# solvent oil and 75 parts of trichloroethylene.

[0014] Furthermore, the specific preparation steps of the above-mentioned insulating paint include:

[0015] S1. Transfer the film-forming agent to a reactor, stir and mix, and heat to carry out a fusion reaction;

[0016] S2. Transfer the fused material to a planetary stirrer, add the reinforcing agent and stir and mix, and knead at 60°C to 120°C for 0.5 h to 2 h;

[0017] S3. Add the filler to the double-cone dryer, turn it over and evacuate for drying at 100°C to 150°C for 1 h to 3 h, then spray the coupling agent and continue to turn it over for 0.5 h to 1 h;

[0018] S4. Add the materials processed in steps S2 and S3 to a planetary stirrer, mix and disperse them, and continue to knead at 100°C to 150°C for 0.5 h to 2 h;

[0019] S5. Press out the materials in step S4 from the bottom of the planetary stirrer, send them to a screw grinder for extrusion and grinding, transfer them to a pulping kettle, add a mold and mildew inhibitor, a light stabilizer and an organic solvent, and stir and pulp at room temperature to form a mixture solution;

[0020] S6. Pump the mixture solution in step S5 into a sand mill for deep grinding to obtain a base stock solution;

[0021] S7. Collect the base stock solution in step S6 into a modulation kettle, supplement the organic solvent, disperse and grind for 1 h to 3 h, add a curing agent and stir until uniform to obtain the above-mentioned insulating paint.

[0022] More specifically, in the above step S5, an appropriate amount of pigment can also be added; in the above step S1, the heating temperature is 50°C to 80°C, and the fusion reaction time is 0.5 h to 2 h.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The high self-cleaning and weather-resistant insulating paint for electrical equipment of the present invention can be named "GRTV" insulating paint, and can be made into types such as GRTV-Ⅰ, GRTV-Ⅱ, GRTV-FB, GRTV-JY, etc. according to its property characteristics and application effects, and has the following characteristics:

[0025] (1) The GRTV-Ⅰ type insulating paint has good adhesion, takes into account ceramics, glass and composite insulating materials, has excellent electrical insulation performance, the insulation strength is not affected by environmental temperature and humidity, has good hydrophobicity, and has strong anti-fouling flashover ability. In particular, the present invention has excellent self-cleaning property, which can reduce the influence of surface fouling on external insulation, and can better play the anti-fouling flashover effect in high salt fog, high humidity and heavy pollution environments; excellent weather aging resistance and longer service life.

[0026] Therefore, the present invention can achieve good results when used on electrical equipment in mining, sandy and coastal environments, thus ensuring the safe operation of electrical equipment.

[0027] (2) An effective ingredient with inactivation and antibacterial functions is introduced into the components of the present invention to prepare the GRTV-II type anti-mildew, antibacterial and anti-algal insulating paint. On the basis of further improving the hydrophobic and anti-fouling properties, the anti-mildew, antibacterial and anti-algal properties are increased. It is especially suitable for the anti-fouling flashover and insulation protection treatment of the external insulation of substation equipment, distribution equipment and transmission equipment that are prone to moss growth in warm and humid areas; it can also be used for the corrosion resistance enhancement and anti-algal and anti-moss of facility frameworks, etc.

[0028] (3) On the basis of anti-fouling flashover, self-cleaning and good weather resistance, the present invention combines high-performance reinforcing agents and coupling agents to prepare the GRTV-FB type explosion-proof and scattered insulating paint, which greatly improves the adhesion and mechanical strength of the material to the body, has excellent impact resistance and tear resistance, and endows the coated insulators with the characteristics of explosion-proof and non-scattering.

[0029] In the application of glass insulators, while improving the anti-fouling flashover ability, when the glass umbrella disc bursts, it is strongly wrapped and does not fall, eliminating the secondary hazards caused by the scattered glass fragments, making it an all-round "safe" glass insulator.

[0030] (4) The present invention combines fluororesin and high heat-resistant and moisture-proof fillers to prepare the GRTV-JY type moisture-proof insulating paint, which has good heat resistance, excellent moisture-proof performance, reduces the influence of moisture on the equipment body and insulation deterioration; has corrosion resistance, prevents the erosion of acids, alkalis, salts and atmospheric acid rain on the equipment; is resistant to ultraviolet rays, ozone and weather aging, and can achieve long-term operation without maintenance.

[0031] Applying the present invention to dry-type electrical equipment represented by dry-type reactors, dry-type transformers, dry-type instrument transformers, etc., it is also used for the repair of exposed conductive parts and insulation wrapping defects, improving the safe operation level of the equipment.

[0032] The present invention has the above excellent characteristics, which are closely related to the types and proportioning processes of the components of the present invention:

[0033] (1) The film-forming agent used in the present invention is a composition of fluorine-containing materials, silicone materials and organic resins. The physical and chemical properties of the composite composition film-forming agent are synergistically enhanced with each other after film formation; different compatibility ratios can regulate the morphological structure of the coating after film formation. The solvent-based fluororesin provides stronger weather resistance and physical strength, and the hydroxyl-terminated polysiloxane endows the flexibility and elasticity after film formation, further enhancing the hydrophobicity and hydrophobic migration. The combined film-forming agent synergistically exerts excellent insulation performance, mechanical performance, corrosion resistance, aging resistance and stable and durable performance, and has good long-term effectiveness; therefore, each component can be synergistically enhanced in terms of weather resistance, low surface energy self-cleaning, hydrophobicity and physical and chemical properties after film formation, so that the insulating paint of the present invention exhibits the designed excellent performance.

[0034] (2) The reinforcing agent used in the present invention has good compatibility with the film-forming agent, can form an interpenetrating network and a complex of molecular interfaces, improve the reinforcing effect, and the formed interface is combined by physical and chemical methods, with higher interface firmness and less performance attenuation during long-term use.

[0035] (3) The filler used in the present invention is an oxide substance, which not only has high chemical stability itself, but also has excellent increment effect and corrosion resistance. In particular, the surface hydroxyl groups in the filler can form partial chemical bonds with the hydroxyl groups of the film-forming agent composition, and can also play a role in partial reinforcement and improving the electrical and physical properties of the coating.

[0036] (4) The light stabilizer used in the present invention has good compatibility with other components, can be evenly dispersed in the insulating coating. The absorption type light stabilizer absorbs ultraviolet rays, converts them into heat energy or other harmless energies, and through its own molecular structure, converts the absorbed ultraviolet ray energy into low energy, better protecting the polymer material from ultraviolet damage.

[0037] (5) In terms of component selection, the mildew and bacteriostasis inhibitor used in the present invention has high self-stability, and slowly releases after being fused with other components to effectively prevent the loss of the bacteriostasis and mildew inhibitor, and can continuously play the role of mildew, bacteriostasis and anti-algae in the insulating coating for a long time.

[0038] In addition, the present invention optimizes the preparation process for the components used.

[0039] The film-forming agent is the fundamental starting point of the present invention. Together with the reinforcing agent, filler, coupling agent and curing agent, it forms an insulating coating. Only when the film-forming agent reacts with the curing agent can a coating film be formed to achieve the required use effect. The reaction between the film-forming agent and the curing agent forms chemical cross-linking, making the linear film-forming agent molecular chains combine with each other into an insoluble and infusible cured product. By adjusting the ratio of the curing agent to the film-forming agent and the subsequent curing conditions, the film-forming state after curing of the insulating coating can be optimized, further improving the performance of the insulating coating.

[0040] The present invention first pre-reacts the silane-based coupling agent used with the filler for modification, so that after it enters the insulating coating system, the fusion of all phase interfaces can be made closer, achieving the effect of enhancing the adhesion between the insulating coating and the substrate.

[0041] The present invention also premixes the curing agent in the insulating coating. When in use, after reacting with trace moisture in the atmospheric environment, it then reacts and cross-links with the active groups forming the film-forming agent, thereby curing to form a coating film. Specific embodiments

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] For those conditions not specified in the embodiments, they can be carried out according to conventional conditions; for reagents or instruments whose manufacturers are not specified, they are all conventional products that can be obtained through commercial purchase.

[0044] Examples 1 to 15

[0045] The preparation of the insulating paint is carried out according to the following steps. The components and their ratios are referred to Table 1 (in Table 1, coupling agent 1# is 3-(trimethoxysilyl)propyl acrylate, coupling agent 2# is γ-aminopropyltrimethoxysilane, coupling agent 3# is γ-(2,3-epoxypropoxy)propyltrimethoxysilane), and the pigments are iron red, indigo, carbon black, chrome yellow, cobalt green pigment or color paste, which can be selected according to actual needs and are not specifically required in the examples. The specific reaction parameters for each step are referred to Table 2:

[0046] S1. Transfer the film-forming agent to a reactor, stir and mix, and heat for a fusion reaction.

[0047] S2. Transfer the fused material to a planetary stirrer, add the reinforcing agent and stir and mix, and knead at a high temperature for a certain time.

[0048] S3. Add the filler to a double-cone dryer, turn it over at a high temperature and evacuate and dry for a certain time, then spray the coupling agent and continue to turn it over for a certain time.

[0049] S4. Add the materials processed in steps S2 and S3 to a planetary stirrer, mix and disperse, and continue to knead at a high temperature.

[0050] S5. Press out the material in step S4 from the bottom of the planetary stirrer, send it to a screw grinder for extrusion and grinding, transfer it to a beating kettle, add or not add pigments according to Table 1, add a mildew and antibacterial agent, a light stabilizer and an organic solvent, and stir and beat at room temperature to form a mixture solution.

[0051] S6. Pump the mixture solution in step S5 into a sand mill for deep grinding to obtain a basic stock solution.

[0052] S7. Collect the basic stock solution in step S6 into a modulation kettle, supplement the organic solvent to ensure that the required materials meet the viscosity requirements, disperse and grind for a certain time, and add a curing agent and stir until uniform to obtain the high self-cleaning and weather-resistant insulating paint for electrical equipment.

[0053] The high self-cleaning and weather-resistant insulating coating for electrical equipment prepared by the present invention is named "GRTV type" insulating coating. At the same time, according to requirements, the components and ratios of the present invention can be controlled to adapt to relatively extreme and typical climate environments, and an insulating coating with extremely outstanding properties in a certain aspect can be prepared. For example, according to its property characteristics and application effects, it can be named "GRTV-I type" or "GRTV-I self-cleaning and anti-fouling type", "GRTV-II type" or "GRTV-II mold, mildew, antibacterial and anti-algal type",

[0054] "GRTV-III type" or "GRTV-FB type" or "GRTV-FB explosion-proof and anti-scattering type" or "GRTV-III explosion-proof and anti-scattering type", and "GRTV-JY type" or "GRTV-IV type" or "GRTV-JY moisture-proof and insulating type" or "GRTV-IV moisture-proof and insulating type". Their components respectively correspond to Examples 1-3, Examples 4-6, Examples 7-9, and Examples 10-12 in Table 1. In order to improve the comprehensive performance of the insulating coating, a general-purpose insulating coating suitable for a wide range of environments can also be prepared, and its components refer to Examples 13-15 in Table 1.

[0055] The samples prepared in Examples 1-15 in Table 1 are respectively Samples 1-15.

[0056] Table 1: Component and ratio table of each example (unit: part)

[0057]

[0058]

[0059] Continued Table 1: Component and ratio table of each example (unit: part)

[0060]

[0061] Continued Table 1: Component and ratio table of each example (unit: part)

[0062]

[0063] Table 2: Preparation parameters of each example

[0064]

[0065]

[0066] Comparative Examples 1-6

[0067] The specific preparation parameters are the same as those in Example 1, except that the components and ratios of the film-forming agent used are different, and the other components and ratios are the same. The components and ratios of the film-forming agent in Comparative Examples 1-6 refer to Table 3, and Control Products 1-6 are respectively prepared.

[0068] Table 3: Components and ratios of film-forming agents in Comparative Examples 1-6

[0069]

[0070] Comparative Examples 7-9

[0071] The specific preparation parameters are the same as those in Example 1, except that the components and ratios of the reinforcing agent used are different, and the other components and ratios are the same. The components and ratios of the reinforcing agent in Comparative Examples 7-9 refer to Table 4, and reference samples 7-9 are prepared respectively.

[0072] Table 4: Components and ratios of reinforcing agents in Comparative Examples 7-9

[0073]

[0074] Comparative Examples 10-12

[0075] The specific preparation parameters are the same as those in Example 1, except that the components and ratios of the filler used are different, and the other components and ratios are the same. The components and ratios of the filler in Comparative Examples 10-12 refer to Table 5, and reference samples 10-12 are prepared respectively.

[0076] Table 5: Components and ratios of fillers in Comparative Examples 10-12

[0077]

[0078] Comparative Example 13

[0079] The components and ratios of the materials used are the same as those in Example 1, except that the specific preparation process is different. In this comparative example, step S1 is not carried out, and the film-forming agent is directly transferred to the planetary stirrer to start step S2, and reference sample 13 is prepared.

[0080] Comparative Example 14

[0081] The components and ratios of the materials used are the same as those in Example 1, except that the specific preparation process is different. In this comparative example, steps S1 and S2 are not carried out, and the film-forming agent and the reinforcing agent are directly transferred to the planetary stirrer, and step S4 is carried out with the filler treated in step S3, and reference sample 14 is prepared.

[0082] Analysis and testing

[0083] The prepared samples and reference samples are detected. The specific detection items and performance indicators are shown in Table 6.

[0084] Table 6: Specific detection items and performance indicators

[0085] Serial number Test item Performance index requirements 1 Appearance and color No impurities, no precipitation, the coating is smooth and flat 2 Adhesion Checked by the scribing method to reach grade 1 - 2 3 Flexibility No cracks or peeling in the 1mm bending test 4 Impact resistance Observed cracks and peeling in the falling weight test 5 Salt spray resistance Exposed the coating in the salt spray environment for 3000h, 3600h or 4200h, no chalking and cracking 6 Artificial weathering Xenon lamp aging for 3000h, 3600h or 4200h, no chalking and roughness < 0.01 7 Self - cleaning property No pollution or only slight pollution after flushing the graphite powder stain 8 Hydrophobicity The hydrophobicity reaches HC1 - HC2 level 9 Chemical resistance No corrosion after exposure to acid, alkali, solvent for 72h, 84h or 96h 10 Damp heat resistance No blistering, sticking and color change after exposure under damp heat conditions for 168h, 92h or 216h 11 Breakdown strength Greater than 20kV per mm 12 Power frequency withstand voltage test The withstand voltage of the 1mm coating is greater than 18kV 13 Pollution withstand voltage test The flashover voltage with coating is more than 1 time higher than that without coating 14 Tear strength The tear strength of the coating is greater than 10N / mm 15 Explosion - proof and non - scattering 10 million times or 12 million times of vibration after the coated insulator is damaged 16 Mildew and algae resistance No growth after 28 days or 56 days of bacteria and algae culture on the coating

[0086] The inspection results of the samples are shown in Table 7, and the inspection results of the reference samples are shown in Table 8.

[0087] Table 7: Summary Table of Sample Inspection Results

[0088]

[0089]

[0090] Continued Table 7: Summary Table of Sample Inspection Results

[0091]

[0092]

[0093] Table 8: Summary Table of Reference Substance Inspection Results

[0094]

[0095] Continued Table 8: Summary Table of Reference Substance Inspection Results

[0096]

[0097]

[0098] As can be seen from the results of Table 7 and Table 8, the samples prepared by the present invention have good adhesion, can take into account ceramics, glass and composite insulating materials, have excellent electrical insulation performance, the insulation strength is not affected by environmental temperature and humidity, have good hydrophobicity, strong anti-fouling flashover ability, have excellent self-cleaning property, can reduce the influence of surface fouling on external insulation during the application process, and can still better play the anti-fouling flashover efficiency in high salt fog, high humidity and heavy pollution environments. Moreover, by introducing an effective component with inactivating and antibacterial functions, on the basis of further improving the hydrophobic anti-fouling property, the anti-mildew, antibacterial and anti-algal properties are increased; the insulating coating prepared by the present invention also greatly improves the adhesion and mechanical strength between the material and the body, has excellent impact resistance and tear resistance, and endows the coated insulators with the characteristics of explosion-proof and non-scattering. Among them, in the application of glass insulators, not only the anti-fouling flashover ability is improved, but also when the glass umbrella disc bursts, it is strongly wrapped and does not fall off, eliminating the secondary hazards caused by the scattering of glass fragments, making it a full-function "safe" glass insulator. In addition, when the present invention is applied to dry-type electrical equipment represented by dry-type reactors, dry-type transformers, dry-type instrument transformers, etc., it is also used for the repair of bare conductive parts and insulation wrapping defects, improving the safe operation level of the equipment.

[0099] Under the component conditions designed in the present invention, by adjusting and changing the component ratios, certain characteristics of the insulating coating can be made more prominent. For example, in Samples 1 to 3, the adhesion is particularly good, the insulation strength is more stable, the hydrophobicity and anti-fouling flashover ability are particularly excellent, making it more suitable for application under heavy pollution conditions, and the aging resistance performance is also improved; for Samples 4 to 6, the adjustment is mainly made to the mold and antibacterial agents. On the basis of improving the hydrophobic and anti-fouling properties, the mold, bacteria and algae inhibition performance can also be increased, making it more suitable for use in warm and humid regions; for Samples 7 to 9, the components such as reinforcing agents and coupling agents are optimized, improving the adhesion and mechanical strength between the material and the body, and endowing the coated insulators with the characteristics of explosion-proof and scattering prevention; for Samples 10 to 12, the heat resistance and moisture-proof performance of the coating are mainly studied, and at the same time, good ultraviolet resistance and weather aging resistance effects can also be obtained.

[0100] In the comparative examples, changing the components and preparation process of the present invention will affect the physical and chemical properties of the insulating coating materials and reduce the insulation ability. In particular, it will reduce the anti-aging performance and self-cleaning performance of the insulating coating under different climates, thereby affecting the external insulation characteristics.

Claims

1. A high self-cleaning and weather-resistant GRTV insulating paint for electrical equipment, characterized in that, In parts by mass, the components of the insulating paint include a film-forming agent composed of 10 to 60 parts of solvent-based fluororesin, 10 to 70 parts of hydroxyl-terminated polysiloxane, 5 to 50 parts of acrylic resin, and 0 to 15 parts of polyether polyol; a reinforcing agent composed of at least two components selected from 0 to 20 parts of MQ silicone resin, 10 to 35 parts of silica, 0 to 20 parts of silicon nitride, and 0 to 25 parts of fluororesin micropowder; a filler composed of 30 to 70 parts of aluminum oxide; 3 to 10 parts of coupling agent; a curing agent composed of two or three components selected from 0 to 10 parts of tetraethyl orthosilicate, 0 to 7 parts of methyltriethoxysilane amide, 0 to 3 parts of dimethyldiethoxysilane amide, or 0 to 2 parts of dibutyltin oxide; 0.5 to 2 parts of light stabilizer; 0.1 to 9 parts of mildew and antibacterial agent; and 50 to 100 parts of trichloroethylene or 50 to 120 parts of butyl acetate as organic solvents. The filler also includes any two or three of 0 to 50 parts of magnesium oxide, 0 to 20 parts of zinc oxide, 0 to 15 parts of titanium dioxide, or 0 to 30 parts of calcium carbonate.

2. The high self-cleaning and weather-resistant GRTV insulating paint for electrical equipment according to claim 1, wherein The coupling agent includes one or two of 3-(trimethoxysilyl)propyl acrylate, γ-aminopropyltrimethoxysilane, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane. In parts by mass, the organic solvent also includes 20 to 30 parts of n-hexane or 30 to 50 parts of solvent oil 120#. The light stabilizer is any one or combination of triazine ultraviolet absorber UV-405 and benzotriazole ultraviolet absorber UV-328. The mildew and antibacterial agent is at least one of p-hydroxybenzoate, potassium sorbate, and fly ash. The insulating paint also includes pigments.

3. The high self-cleaning and weather-resistant GRTV insulating paint for electrical equipment according to claim 2, wherein, In parts by mass, the film-forming agent in the insulating paint is composed of 10 to 30 parts of solvent-based fluororesin, 40 to 70 parts of hydroxyl-terminated polysiloxane, 5 to 15 parts of acrylic resin, and 5 to 15 parts of polyether polyol. The reinforcing agent is composed of 10 to 20 parts of MQ silicone resin, 10 to 30 parts of silica, 0 to 10 parts of silicon nitride, and 5 to 15 parts of fluororesin micropowder. The filler is composed of 30 to 50 parts of aluminum oxide, 10 to 20 parts of zinc oxide, and 5 to 15 parts of titanium dioxide. The coupling agent is composed of 3 to 5 parts of 3-(trimethoxysilyl)propyl acrylate and 1 to 3 parts of γ-aminopropyltrimethoxysilane. The light stabilizer is 0.5 to 2 parts of triazine ultraviolet absorber UV-405. The mildew and antibacterial agent is 0.1 to 0.3 parts of potassium sorbate. The curing agent is composed of 3 to 7 parts of methyltriethoxysilane amide, 1 to 3 parts of dimethyldiethoxysilane amide, and 0.2 to 1 part of dibutyltin oxide. The organic solvent is composed of 30 to 50 parts of solvent oil 120# and 50 to 100 parts of trichloroethylene.

4. The high self-cleaning and weather-resistant GRTV insulation coating for electrical equipment according to claim 2, characterized in that, By mass parts, the film-forming agent in the insulating paint consists of 30 to 60 parts of solvent-based fluororesin, 20 to 50 parts of hydroxy-terminated polysiloxane, 5 to 15 parts of acrylic resin, and 0 to 5 parts of polyether polyol; the reinforcing agent consists of 10 to 30 parts of silica and 10 to 25 parts of fluororesin micropowder; the filler consists of 30 to 50 parts of aluminum oxide, 5 to 15 parts of magnesium oxide, and 20 to 30 parts of calcium carbonate; the coupling agent is 3 to 8 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane; the light stabilizer is 0.5 to 2 parts of triazine ultraviolet absorber UV-405; the mildew and antibacterial agent consists of 1 to 3 parts of p-hydroxybenzoate, 3 to 8 parts of fly ash, and 0 to 1 part of potassium sorbate; the curing agent consists of 3 to 7 parts of methyltriethylamide silane, 1 to 3 parts of dimethyldiethylamide silane, and 0.2 to 1 part of dibutyltin oxide; the organic solvent is 60 to 100 parts of trichloroethylene.

5. The high self-cleaning and weather-resistant GRTV insulating paint for electrical equipment according to claim 2, characterized in that, By mass parts, the film-forming agent in the insulating paint consists of 20 to 50 parts of solvent-based fluororesin, 10 to 30 parts of hydroxy-terminated polysiloxane, 15 to 30 parts of acrylic resin, and 5 to 15 parts of polyether polyol; the reinforcing agent consists of 10 to 20 parts of MQ silicone resin, 15 to 35 parts of silica, and 5 to 20 parts of silicon nitride; the filler consists of 40 to 70 parts of aluminum oxide, 5 to 15 parts of zinc oxide, 5 to 15 parts of titanium dioxide, and 10 to 30 parts of calcium carbonate; the coupling agent consists of 2 to 5 parts of γ-aminopropyltrimethoxysilane and 3 to 8 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane; the light stabilizer is 0.5 to 2 parts of benzotriazole ultraviolet absorber UV-328; the mildew and antibacterial agent is 0.1 to 0.3 parts of potassium sorbate; the curing agent consists of 5 to 10 parts of tetraethyl orthosilicate and 0.5 to 2 parts of dibutyltin oxide; the organic solvent consists of 20 to 30 parts of n-hexane and 70 to 120 parts of butyl acetate.

6. The highly self-cleaning and weather-resistant GRTV insulating paint for electrical equipment according to claim 2, characterized in that, By mass parts, the film-forming agent in the insulating paint consists of 5 to 20 parts of solvent-based fluororesin, 40 to 70 parts of hydroxyl-terminated polysiloxane, 20 to 50 parts of acrylic resin, and 0 to 5 parts of polyether polyol; the reinforcing agent consists of 10 to 30 parts of silicon dioxide and 5 to 20 parts of silicon nitride; the filler consists of 40 to 70 parts of aluminum oxide, 20 to 50 parts of magnesium oxide, and 0 to 10 parts of titanium dioxide; the coupling agent consists of 1 to 3 parts of 3-(trimethoxysilyl)propyl acrylate and 3 to 5 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane; the light stabilizer is 0.5 to 2 parts of triazine ultraviolet absorber UV-405; the mildew and antibacterial agent is 0.1 to 0.3 parts of potassium sorbate; the curing agent consists of 3 to 7 parts of methyltriethylamide silane, 1 to 3 parts of dimethyldiethylamide silane, and 0.2 to 1 part of dibutyltin oxide; the organic solvent consists of 30 to 50 parts of 120# solvent oil and 50 to 100 parts of trichloroethylene.

7. The high self-cleaning and weather-resistant GRTV insulating paint for electrical equipment according to claim 2, characterized in that, By mass parts, the film-forming agent in the insulating paint consists of 30 to 50 parts of solvent-based fluororesin, 30 to 50 parts of hydroxyl-terminated polysiloxane, 10 to 20 parts of acrylic resin, and 3 to 10 parts of polyether polyol; the reinforcing agent consists of 10 to 15 parts of MQ silicone resin, 15 to 20 parts of silicon dioxide, 5 to 10 parts of silicon nitride, and 10 to 12 parts of fluororesin micropowder; the filler consists of 40 to 50 parts of aluminum oxide, 5 to 15 parts of zinc oxide, 10 to 15 parts of titanium dioxide, and 15 to 25 parts of calcium carbonate; the coupling agent consists of 2 to 5 parts of γ-aminopropyltrimethoxysilane and 4 to 8 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane; the light stabilizer consists of 0.5 to 1 part of benzotriazole ultraviolet absorber UV-328 and 0.5 to 1 part of triazine ultraviolet absorber UV-405; the mildew and antibacterial agent consists of 1 to 3 parts of p-hydroxybenzoate, 3 to 6 parts of fly ash, and 0.3 to 0.5 parts of potassium sorbate; the curing agent consists of 4 to 7 parts of methyltriethylamide silane, 1 to 3 parts of dimethyldiethylamide silane, and 0.2 to 1 part of dibutyltin oxide; the organic solvent consists of 30 to 50 parts of 120# solvent oil and 50 to 90 parts of trichloroethylene.

8. The high self-cleaning and weather-resistant GRTV insulating paint for electrical equipment according to claim 2, characterized in that, By mass parts, the film-forming agent in the insulating paint consists of 40 parts of solvent-based fluororesin, 45 parts of hydroxyl-terminated polysiloxane, 15 parts of acrylic resin, and 8 parts of polyether polyol; the reinforcing agent consists of 12 parts of MQ silicone resin, 18 parts of silica, 8 parts of silicon nitride, and 12 parts of fluororesin micropowder; the filler consists of 45 parts of aluminum oxide, 10 parts of zinc oxide, 15 parts of titanium dioxide, and 20 parts of calcium carbonate; the coupling agent consists of 3 parts of γ-aminopropyltrimethoxysilane and 6 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane; the light stabilizer consists of 0.8 part of benzotriazole ultraviolet absorber UV-328 and 0.8 part of triazine ultraviolet absorber UV-405; the mildew and antibacterial agent consists of 2 parts of p-hydroxybenzoate, 4 parts of fly ash, and 0.5 part of potassium sorbate; the curing agent consists of 6 parts of methyltriethylamide silane, 2 parts of dimethyldiethylamide silane, and 0.5 part of dibutyltin oxide; the organic solvent consists of 45 parts of 120# solvent oil and 75 parts of trichloroethylene.

9. A highly self-cleaning and weather-resistant GRTV insulating paint for electrical equipment according to any one of claims 1 to 8, characterized in that, The specific preparation steps of the insulating paint include: S1. Transfer the film-forming agent to a reactor, stir and mix, and heat to carry out a fusion reaction; S2. Transfer the fused material to a planetary stirrer, add the reinforcing agent and stir and mix, and knead at 60°C to 120°C for 0.5 h to 2 h; S3. Add the filler to a double-cone dryer, turn it over and evacuate and dry at 100°C to 150°C for 1 h to 3 h, spray the coupling agent and continue to turn it over for 0.5 h to 1 h; S4. Add the materials treated in steps S2 and S3 to a planetary stirrer, mix and disperse, and continue to knead at 100°C to 150°C for 0.5 h to 2 h; S5. Press out the material in step S4 from the bottom of the planetary stirrer, send it to a screw grinder for extrusion and grinding, transfer it to a pulping kettle, add the mildew and antibacterial agent, light stabilizer and organic solvent, and stir and pulp at room temperature to form a mixture solution; S6. Pump the mixture solution in step S5 into a sand mill for deep grinding to obtain a base stock solution; S7. Collect the base stock solution in step S6 into a modulation kettle, supplement the organic solvent, disperse and grind for 1 h to 3 h, add the curing agent and stir until uniform to obtain the insulating paint.

10. According to claim 9, a highly self-cleaning and weather-resistant GRTV insulation coating for electrical equipment material, characterized in that, In step S5, pigments can also be added; in step S1, The heating temperature is 50°C to 80°C, and the fusion reaction time is 0.5 h to 2 h.

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