High self-cleaning weather-resistant GRTV insulating coating for electric power equipment

Abstract

The application discloses a kind of high self-cleaning weather-resistant GRTV insulating coating for electric power equipment, component includes, film forming agent is composed of solvent type fluorine resin, terminal hydroxyl polysiloxane, acrylic resin and polyether polyol, reinforcing agent is composed of at least two components of MQ silicon resin, silicon dioxide, silicon nitride, fluorine resin micro powder, filling agent is composed of aluminium oxide, coupling agent is composed of two or three components of ethyl silicate, methyl triacetamide silane, dimethyl diacetamide silane or dibutyl tin oxide, curing agent, light stabilizer, mildewproof antibacterial agent, with trichloroethylene or butyl acetate as organic solvent;The application has good adhesion, excellent electrical insulation performance, insulation strength is not affected by environmental temperature and humidity, good hydrophobicity, strong anti-pollution flashover ability, and excellent mildewproof and antibacterial properties and anti-bursting and scattering characteristics, with high self-cleaning, can better play the anti-pollution flashover efficiency under high salt, high humidity and heavy pollution.

Description

Technical Field

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

[0002] The electrification of factories, urban lighting, electric mobility for residents, and the rapidly developing artificial intelligence computing technology all require vast amounts of electricity. The comprehensive development of electricity involves numerous aspects, including power generation, grid connection, load, and storage. High-voltage, ultra-high-voltage, and ultra-high-voltage transmission and transformation systems transmit electricity from production to consumption over long distances at high altitudes. One of the key technologies for power transmission under atmospheric conditions is the insulation and external insulation of the power system.

[0003] Ceramic and tempered glass, as classic insulating materials, as well as insulating equipment and insulators made of various types of synthetic resins, have solved the internal insulation problem required by the power system. However, due to the various harsh and changeable atmospheric environments in which external insulation is exposed, its safety, reliability and durability have not been effectively solved. Currently, in power systems, the most commonly used external insulating coating is room temperature vulcanized silicone rubber anti-pollution flashover coating (i.e., RTV-type coating or RTV-type material). However, due to the vast geographical area spanned by power transmission, the complex geographical environment, the uneven development level, and the diverse operating environment of power equipment, the room temperature vulcanized silicone rubber anti-pollution flashover coating used is prone to aging and even failure. Its performance and lifespan are problematic and cannot meet the safe operation needs of the power system. For example, in a high humidity environment, mold, green algae and moss grow on the insulating surface of power equipment, which not only reduces the external insulation performance, but also shortens the service life of the equipment due to corrosion and aging. For example, near calcite powder and calcium carbonate powder processing plants, the conventional anti-pollution flashover coating of power insulators is seriously contaminated, with the accumulated dirt exceeding 2mg / cm 2 , difficult to clean, and abnormal discharges often occur after the dirt absorbs moisture; for example, in coastal areas, after the power insulators are coated with conventional anti-pollution flashover paint, the salt accumulation is more serious than that of uncoated ones, and due to the influence of humid salt mist, the coating will partially peel off in less than 2 years, and the mottled insulator surface will produce uneven electric field distribution, which increases the risk of failure; for example, in a strong ultraviolet environment with occasional wind and sand, the conventional anti-pollution flashover coating on the power insulator is prone to defects such as powdering and peeling; for example, in the area near the substation of a thermal power plant, after the insulators are coated with conventional anti-pollution flashover paint, "oily" dirt adheres to the surface, making the surface sticky and losing its hydrophobicity, and discharge occurs under the moisture of the cooling tower; for example, in a substation located in a warm and humid area with dense vegetation, the circuit breakers coated with conventional anti-pollution flashover paint often grow algae and other dirt, and due to moisture absorption and uneven salt distribution, electric field distortion occurs, causing equipment explosion accidents.

[0004] In view of the different application environments mentioned above, it is urgent to optimize and improve the existing RTV coatings to improve their self-cleaning ability and service life to 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 purpose of the present invention is to provide a highly self-cleaning and weather-resistant GRTV insulating coating for power equipment, which has strong insulation performance, self-cleaning performance, weather resistance, hydrophobicity, adhesion performance and corrosion resistance, as well as mildew and algae resistance and anti-explosion and scattering properties, providing high-reliability external insulation capabilities for insulators in power systems.

[0006] The technical solution adopted by the present invention provides a highly self-cleaning and weather-resistant GRTV insulating coating for power equipment. The key is that, in parts by mass, the components of the insulating coating include: a film-forming agent composed of 10 to 60 parts of solvent-based fluororesin, 10 to 70 parts of terminal hydroxyl 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 of 0 to 20 parts of MQ silicone resin, 10 to 35 parts of silicon dioxide, 0 to 20 parts of silicon nitride and 0 to 25 parts of fluororesin micropowder; and 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 of 0 to 10 parts of tetraethyl orthosilicate, 0 to 7 parts of methyltriacetamide silane, 0 to 3 parts of dimethyldiacetamide silane 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 solvent; the above-mentioned 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.

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

[0008] Specifically, in parts by mass, the film-forming agent in the above-mentioned insulating coating is composed of 10 to 30 parts of solvent-based fluororesin, 40 to 70 parts of terminal hydroxyl 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 silicon dioxide, 0 to 10 parts of silicon nitride and 5 to 15 parts of fluororesin powder; 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- The insulating coating is composed of aminopropyltrimethoxysilane, the above-mentioned light stabilizer is 0.5 to 2 parts of triazine ultraviolet absorber UV-405, the above-mentioned mildew and antibacterial agent is 0.1 to 0.3 parts of potassium sorbate, the above-mentioned curing agent is composed of 3 to 7 parts of methyltriacetamide silane, 1 to 3 parts of dimethyldiacetamide silane and 0.2 to 1 parts of dibutyltin oxide, and the above-mentioned organic solvent is composed 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 excellent high self-cleaning weather resistance and can be named "GRTV-Ⅰ type" insulating coating or "GRTV-Ⅰ self-cleaning and anti-fouling type" insulating coating.

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

[0010] Specifically, in parts by mass, the film-forming agent in the above-mentioned insulating coating is composed of 20 to 50 parts of solvent-based fluororesin, 10 to 30 parts of terminal hydroxyl polysiloxane, 15 to 30 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, 15 to 35 parts of silicon dioxide and 5 to 20 parts of silicon nitride, the filler is composed 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 is composed of 2 to 5 parts of γ-aminopropyltrimethoxysilane and 3 to 8 parts of γ-(2,3-epoxypropoxy)propyltrimethoxy The insulating coating prepared from the above components has excellent anti-explosion and scattering properties, and can be named "GRTV-FB type" insulating coating or "GRTV-III type" insulating coating or "GRTV-FB anti-explosion and scattering type" insulating coating or "GRTV-III anti-explosion and scattering type" insulating coating.

[0011] Specifically, in parts by mass, the film-forming agent in the above-mentioned insulating coating is composed of 5 to 20 parts of solvent-based fluororesin, 40 to 70 parts of terminal hydroxyl polysiloxane, 20 to 50 parts of acrylic resin and 0 to 5 parts of polyether polyol, the above-mentioned reinforcing agent is composed of 10 to 30 parts of silicon dioxide and 5 to 20 parts of silicon nitride, the above-mentioned filler is composed of 40 to 70 parts of aluminum oxide, 20 to 50 parts of magnesium oxide and 0 to 10 parts of titanium dioxide, the above-mentioned coupling agent is composed of 1 to 3 parts of 3-(trimethoxysilyl)propyl acrylate and 3 to 5 parts of γ-(2,3-epoxypropyloxy)propyltrimethoxysilane, and the above-mentioned light stabilizer is 0.5 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 above-mentioned curing agent is composed of 3 parts to 7 parts of methyltriacetamide silane, 1 part to 3 parts of dimethyldiacetamide silane and 0.2 part to 1 part of dibutyltin oxide, and the above-mentioned organic solvent is composed of 30 parts to 50 parts of 120# solvent oil and 50 parts to 100 parts of trichloroethylene; the insulating coating prepared from the above components has significant moisture-proof and insulating properties and can be named "GRTV-JY type" insulating coating or "GRTV-IV type" insulating coating or "GRTV-JY moisture-proof insulating type" insulating coating or "GRTV-IV moisture-proof insulating type" insulating coating.

[0012] Preferably, in parts by mass, the film-forming agent in the above-mentioned insulating coating is composed of 30 to 50 parts of solvent-based fluororesin, 30 to 50 parts of terminal hydroxyl polysiloxane, 10 to 20 parts of acrylic resin and 3 to 10 parts of polyether polyol, the reinforcing agent is composed 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 powder, the filler is composed 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 is composed of 2 to 5 parts of γ-aminopropyltrimethoxysilane and 4 The above-mentioned light stabilizer is composed of 0.5 to 1 parts of benzotriazole ultraviolet absorber UV-328 and 0.5 to 1 parts of triazine ultraviolet absorber UV-405. The above-mentioned mildew and antibacterial agent is composed of 1 to 3 parts of parahydroxybenzoate, 3 to 6 parts of fly ash and 0.3 to 0.5 parts of potassium sorbate. The above-mentioned curing agent is composed of 4 to 7 parts of methyltriacetamide silane, 1 to 3 parts of dimethyldiacetamide silane and 0.2 to 1 parts of dibutyltin oxide. The above-mentioned organic solvent is composed of 30 to 50 parts of 120# solvent oil and 50 to 90 parts of trichloroethylene.

[0013] Optimally, in parts by mass, the film-forming agent in the above-mentioned insulating coating is composed of 40 parts of solvent-based fluororesin, 45 parts of terminal hydroxyl polysiloxane, 15 parts of acrylic resin and 8 parts of polyether polyol, the reinforcing agent is composed of 12 parts of MQ silicone resin, 18 parts of silicon dioxide, 8 parts of silicon nitride and 12 parts of fluororesin powder, the filler is composed 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 is composed of 3 parts of γ-aminopropyltrimethoxysilane and 6 parts of γ-(2 , 3-glycidoxy)propyltrimethoxysilane, the above-mentioned light stabilizer is composed of 0.8 parts of benzotriazole ultraviolet absorber UV-328 and 0.8 parts of triazine ultraviolet absorber UV-405, the above-mentioned mildew and antibacterial agent is composed of 2 parts of parahydroxybenzoate, 4 parts of fly ash and 0.5 parts of potassium sorbate, the above-mentioned curing agent is composed of 6 parts of methyltriacetamide silane, 2 parts of dimethyldiacetamide silane and 0.5 parts of dibutyltin oxide, and the above-mentioned organic solvent is composed of 45 parts of 120# solvent oil and 75 parts of trichloroethylene.

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

[0015] S1. Transfer the film-forming agent into the reactor, stir and mix, and heat until a fusion reaction occurs;

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

[0017] S3. Add the filler into a double cone dryer, tumble and vacuum dry at 100℃~150℃ for 1h~3h, spray the coupling agent and continue tumbling for 0.5h~1h;

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

[0019] S5, pressing the material in step S4 out from the bottom of the planetary mixer, sending it to a screw grinder for extrusion grinding, transferring it to a beating kettle, adding a mildew and antibacterial agent, a light stabilizer and an organic solvent, and stirring and beating it at room temperature to form a mixture solution;

[0020] S6, pumping the mixture solution in step S5 into a sand mill for deep grinding to obtain a base liquid;

[0021] S7. Collect the basic liquid in step S6 into a preparation kettle, add an organic solvent, disperse and grind for 1 hour to 3 hours, add a curing agent and stir until uniform to obtain the above-mentioned insulating coating.

[0022] More specifically, in the above step S5, an appropriate amount of pigment may 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 highly self-cleaning and weather-resistant insulating coating for power equipment of the present invention can be named "GRTV" insulating coating, and can be made into GRTV-I, GRTV-II, GRTV-FB, GRTV-JY and other types according to its properties and application effects, and has the following characteristics:

[0025] (1) GRTV-I type insulating coating has good adhesion, taking into account ceramic, glass and composite insulating materials, excellent electrical insulation performance, insulation strength is not affected by ambient temperature and humidity, good hydrophobicity, and strong anti-pollution flashover ability. In particular, the present invention has excellent self-cleaning properties, which can reduce the impact of surface dirt on external insulation, and better play the anti-pollution flashover performance in high salt fog, high humidity, and heavy pollution environments; excellent weather aging resistance, with a longer service life.

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

[0027] (2) The present invention introduces an effective ingredient with inactivation and antibacterial function into the components to produce GRTV-II type mildew-proof, antibacterial and anti-algae insulation coating, which further enhances the hydrophobic and antifouling properties while increasing mildew-proof, antibacterial and anti-algae properties. It is particularly suitable for anti-pollution flashover and insulation protection treatment of external insulation of substation equipment, distribution equipment, and transmission equipment in warm and humid areas that are prone to moss growth. It can also be used to enhance the corrosion resistance and prevent algae and moss of facility structures.

[0028] (3) Based on the anti-pollution flashover, self-cleaning and good weather resistance, the present invention combines high-performance reinforcing agents and coupling agents to form GRTV-FB type explosion-proof and scattering insulating coatings, which greatly improves the adhesion and mechanical strength between the material and the body, has excellent impact resistance and tear resistance, and gives the coated insulators anti-explosion and scattering characteristics.

[0029] The application of glass insulators not only improves the anti-pollution flashover capability, but also ensures that the glass umbrella plate is strongly wrapped and does not fall after it bursts, eliminating the secondary hazards caused by the scattering of glass fragments, making it an all-round "safe" glass insulator.

[0030] (4) The fluororesin of the present invention is combined with a high heat-resistant and moisture-proof filler to prepare a GRTV-JY type moisture-proof insulating coating, which has good heat resistance and excellent moisture-proof performance, reducing the influence of moisture on the equipment body and insulation degradation; corrosion resistance, preventing acid, alkali, salt and atmospheric acid rain from eroding the equipment; ultraviolet resistance, ozone resistance, and weather aging resistance, and can achieve maintenance-free long-term operation.

[0031] The present invention is applied to dry-type electrical equipment represented by dry-type reactors, dry-type transformers, dry-type mutual inductors, etc., and is also used to repair defects in exposed conductive parts and insulation packages to improve the safe operation level of the equipment.

[0032] The present invention has the above-mentioned excellent properties, which are closely related to the types of components and the proportioning process of the present invention:

[0033] (1) The film-forming agent used in the present invention is a composition of a fluorine-containing material, an organosilicon material and an organic resin. The composite composition film-forming agent synergistically enhances each other's physical and chemical properties 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 end-hydroxy polysiloxane imparts flexibility and elasticity to the film after formation, further improving the hydrophobicity and hydrophobic migration. The combined film-forming agent synergistically exerts excellent insulation performance, mechanical properties, corrosion resistance, aging resistance and stable durability, and has good long-term effectiveness; therefore, the components can synergistically enhance each other in weather resistance, low surface energy self-cleaning property, hydrophobicity and physical and chemical properties after film formation, so that the insulating coating 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 molecular interface complex, thereby improving the reinforcing effect. Moreover, the interface formed is combined by both physical and chemical means, the interface is more firm, and the performance is not easily attenuated during long-term use.

[0035] (3) The filler used in the present invention is an oxide-based substance, which not only has high chemical stability, but also has excellent incremental 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 partially reinforcing and increasing the electrical and physical properties of the coating.

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

[0037] (5) In terms of component selection, the mildew and antibacterial agent used in the present invention has high stability. After being fused with other components, it is slowly released to effectively prevent the loss of the antibacterial and antifungal agent, and can continuously exert mildew and antibacterial and antialgae effects in the insulating coating for a long time.

[0038] In addition, the present invention optimizes the preparation process with respect to the components used.

[0039] The film-forming agent is the starting point of the present invention. Together with the reinforcing agent, filler, coupling agent, and curing agent, it forms the insulating coating. Only when the film-forming agent reacts with the curing agent can the coating film be formed and the desired effect achieved. The reaction between the film-forming agent and the curing agent forms a chemical crosslink, binding the linear film-forming agent molecular chains to form an insoluble and infusible solid. By adjusting the ratio of the curing agent to the film-forming agent and regulating the subsequent curing conditions, the film-forming state of the insulating coating after curing can be optimized, further enhancing the performance of the insulating coating.

[0040] The present invention pre-reacts the silane coupling agent used with the filler to modify it, so that after it enters the insulating coating system, it can make the fusion of all phase interfaces more compact, thereby achieving the effect of enhancing the adhesion between the insulating coating and the substrate.

[0041] The present invention also premixes the curing agent into the insulating coating, which reacts with trace moisture in the atmosphere and then crosslinks with the active groups of the film-forming agent to form a coating film. DETAILED DESCRIPTION

[0042] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] If the specific conditions are not specified in the examples, the experiments can be carried out under conventional conditions; if the manufacturers of the reagents or instruments are not specified, they are all conventional products that can be purchased from the market.

[0044] Examples 1 to 15

[0045] The insulating coating was prepared according to the following steps, wherein the components and proportions are referred to Table 1 (in Table 1, coupling agent 1# is 3-(trimethoxysilyl)propyl acrylate, coupling agent 2# is γ-aminopropyltrimethoxysilane, and coupling agent 3# is γ-(2,3-epoxypropoxy)propyltrimethoxysilane). The pigments are iron oxide 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 of each step are referred to Table 2:

[0046] S1. Transfer the film-forming agent into the reactor, stir and mix, and heat to carry out fusion reaction;

[0047] S2. Transfer the fused materials into a planetary mixer, add a reinforcing agent, stir and mix, and knead at high temperature for a certain period of time;

[0048] S3. Add the filler into the double cone dryer, turn it over and dry it under high temperature for a certain period of time, then spray the coupling agent and continue turning it over for a certain period of time;

[0049] S4, adding the materials processed in steps S2 and S3 to a planetary mixer, mixing and dispersing, and continuing to knead at a high temperature;

[0050] S5. The material in step S4 is pressed out from the bottom of the planetary mixer, sent to a screw grinder for extrusion grinding, and transferred to a beating kettle. Pigments are added or not according to Table 1, and mildew and antibacterial agents, light stabilizers and organic solvents are added. The mixture solution is stirred and beaten at room temperature;

[0051] S6, pumping the mixture solution in step S5 into a sand mill for deep grinding to obtain a base liquid;

[0052] S7. Collect the basic liquid in step S6 into a preparation kettle, add organic solvent to ensure that the required material meets the viscosity requirements, disperse and grind for a certain time, add a curing agent and stir until uniform to obtain the highly self-cleaning and weather-resistant insulating coating for power equipment.

[0053] The highly self-cleaning and weather-resistant insulating coating for power equipment prepared by the present invention is named "GRTV type" insulating coating. At the same time, the components and proportions of the present invention can be controlled according to needs to adapt to more extreme and typical climate environments, and insulating coatings with extremely outstanding properties in certain aspects can be prepared. For example, according to their properties and application effects, they can be named "GRTV-I type" or "GRTV-I self-cleaning and anti-fouling type", "GRTV-II type" or "GRTV-II anti-mildew, antibacterial and anti-algae type",

[0054] The components of the "GRTV-III" or "GRTV-FB" or "GRTV-FB explosion-proof and scattering-proof type" or "GRTV-III explosion-proof and scattering-proof type," as well as the "GRTV-JY" or "GRTV-IV" or "GRTV-JY moisture-proof and insulating type" or "GRTV-IV moisture-proof and insulating type" correspond to Examples 1 to 3, 4 to 6, 7 to 9, and 10 to 12 in Table 1, respectively. To improve the overall performance of the insulating coating, a universal insulating coating that is adaptable to a wide range of environments can be prepared. The components thereof refer to Examples 13 to 15 in Table 1.

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

[0056] Table 1: Components and ratios of various examples (unit: part)

[0057]

[0058]

[0059] Table 1: Components and ratios of various examples (unit: part)

[0060]

[0061] Table 1: Components and ratios of various examples (unit: part)

[0062]

[0063] Table 2: Preparation parameters of each example

[0064]

[0065]

[0066] Comparative Examples 1 to 6

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

[0068] Table 3: Components and proportions of film-forming agent of Comparative Examples 1-6

[0069]

[0070] Comparative Examples 7-9

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

[0072] Table 4: Components and proportions of reinforcing agent of Comparative Examples 7-9

[0073]

[0074] Comparative Examples 10-12

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

[0076] Table 5: Components and proportions of filler of Comparative Examples 10-12

[0077]

[0078] Comparative Example 13

[0079] The components and proportions of the materials used are the same as in Example 1, except that the specific preparation process is different. This comparative example does not perform the S1 step, and directly transfers the film-forming agent into the planetary mixer to start the S2 step, to prepare Comparative Example 13.

[0080] Comparative Example 14

[0081] The components and proportions of the materials used are the same as in Example 1, except that the specific preparation process is different. This comparative example does not perform the S1 and S2 steps, and directly transfers the film-forming agent and the reinforcing agent into the planetary mixer to perform the S4 step with the filler treated in the S3 step, to prepare Comparative Example 14.

[0082] Analysis and testing

[0083] The prepared samples and comparative examples are detected, and 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 items Performance index requirements 1 Appearance and color No impurities, no precipitation, smooth coating 2 Adhesion The circle method examination reaches level 1 to level 2 3 flexibility No cracks or peeling in 1mm bending test 4 Impact resistance Drop hammer test to observe cracks and spalling 5 Salt spray resistance The coating was exposed to salt spray for 3000h, 3600h or 4200h without powdering or cracking. 6 Artificial weathering Xenon lamp aging for 3000h, 3600h or 4200h, no powdering and roughness <0.01 7 Self-cleaning Graphite powder contamination flushing no pollution or only slight pollution 8 hydrophobicity Hydrophobicity reaches HC1~HC2 level 9 Chemical resistance Acid, alkali, solvent 72h, 84h or 96h, no corrosion 10 Moisture and heat resistance No blistering, stickiness or discoloration after exposure to damp heat conditions for 168h, 92h or 216h 11 Breakdown strength More than 20kV per mm 12 Power frequency withstand voltage test The coating 1mm withstand voltage is greater than 18kV 13 Dirt pressure test The flashover voltage of the coating is more than doubled compared to the uncoated one. 14 Tear strength Coating tear strength greater than 10N / mm 15 Anti-explosion and scattering 10 million or 12 million vibrations after the coated insulator is damaged 16 Anti-mildew and anti-algae The coating was cultured with bacteria and algae for 28 or 56 days without growth.

[0086] The sample test results are shown in Table 7, and the comparative example test results are shown in Table 8.

[0087] Table 7: Summary of sample inspection results

[0088]

[0089]

[0090] Table 7: Summary of sample inspection results

[0091]

[0092]

[0093] Table 8: Summary of test results of reference substances

[0094]

[0095] Table 8: Summary of test results of reference substances

[0096]

[0097]

[0098] As shown in Tables 7 and 8, the samples prepared by the present invention exhibit excellent adhesion and can be used with ceramic, glass, and composite insulating materials. They also exhibit superior electrical insulation performance, with insulation strength unaffected by ambient temperature and humidity. They also exhibit good hydrophobicity, strong flashover resistance, and excellent self-cleaning properties. During use, they mitigate the impact of surface contamination on external insulation, maintaining their flashover resistance even in high salt fog, high humidity, and heavily polluted environments. Furthermore, the introduction of an active ingredient with antibacterial properties further enhances hydrophobicity and antifouling properties, while also increasing mildew, antibacterial, and anti-algae properties. The insulating coating prepared by the present invention also significantly improves the material's adhesion to the substrate and mechanical strength, exhibiting excellent impact and tear resistance, and imparting anti-blasting and anti-scattering properties to the coated insulator. In glass insulator applications, the coating not only enhances flashover resistance but also prevents the glass plate from falling after rupture, effectively encasing it and preventing it from falling. This eliminates the secondary hazards of scattered glass fragments, making it a versatile and "safe" glass insulator. In addition, the present invention is applied to dry-type electrical equipment represented by dry-type reactors, dry-type transformers, dry-type mutual inductors, etc., and is also used to repair defects in exposed conductive parts and insulation packages to improve the safe operation level of the equipment.

[0099] Under the component conditions designed by this invention, adjusting the component ratios can also enhance certain properties of the insulating coating. For example, samples 1-3 exhibit exceptionally good adhesion, more stable insulation strength, exceptional hydrophobicity and flashover resistance, making them more suitable for use in heavily polluted conditions, and improved aging resistance. Samples 4-6, for example, primarily adjust the anti-mildew and anti-bacterial agent, enhancing not only hydrophobicity and anti-fouling properties but also anti-mildew, anti-bacterial, and anti-algae properties, making them more suitable for use in warm and humid regions. Samples 7-9, for example, optimize components such as the reinforcing agent and coupling agent, improving the material's adhesion to the substrate and mechanical strength, and imparting anti-cracking and anti-scattering properties to the coated insulator. Samples 10-12 focus on the coating's heat and moisture resistance, while also achieving excellent resistance to UV rays and weathering.

[0100] In the comparative example, changing the components and preparation process of the present invention will affect the material chemical properties of the insulating coating and reduce the insulation capacity, especially reducing the anti-aging performance and self-cleaning performance of the insulating coating in different climates, thereby affecting the external insulation characteristics.

Claims

1. A highly self-cleaning and weather-resistant GRTV insulating coating for power equipment, characterized in that: The components of the insulating coating include, by mass, a film-forming agent consisting of 10 to 60 parts of solvent-based fluororesin, 10 to 70 parts of terminal hydroxyl polysiloxane, 5 to 50 parts of acrylic resin, and 0 to 15 parts of polyether polyol; a reinforcing agent consisting of at least two of 0 to 20 parts of MQ silicone resin, 10 to 35 parts of silicon dioxide, 0 to 20 parts of silicon nitride, and 0 to 25 parts of fluororesin micropowder; a filler consisting of 30 to 70 parts of aluminum oxide; a coupling agent consisting of 3 to 10 parts of a methyltriacetamide silane; and a reinforcing agent consisting of 3 to 7 parts of a methyltriacetamide silane. , a curing agent composed of 1 to 3 parts of dimethyldiethylamide silane and 0.2 to 1 part of dibutyltin oxide or composed of 5 to 10 parts of ethyl orthosilicate and 0.5 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 an organic solvent; 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; The specific preparation steps of the insulating coating include: S1. Transfer the film-forming agent into the reactor, stir and mix, and heat until a fusion reaction occurs; S2. Transfer the fused materials into a planetary mixer, add a reinforcing agent, stir and mix, and knead at 60℃~120℃ for 0.5h~2h; S3. Add the filler into a double-cone dryer, tumble and vacuum dry at 100-150°C for 1-3 hours, spray the coupling agent and continue tumbling for 0.5-1 hour; S4. Add the materials processed in steps S2 and S3 to a planetary mixer, mix and disperse, and continue kneading at 100°C to 150°C for 0.5 h to 2 h; S5, pressing the material in step S4 out from the bottom of the planetary mixer, sending it to a screw grinder for extrusion grinding, transferring it to a beating kettle, adding a mildew and antibacterial agent, a light stabilizer and an organic solvent, and stirring and beating it at room temperature to form a mixture solution; S6, pumping the mixture solution in step S5 into a sand mill for deep grinding to obtain a base liquid; S7, collecting the base liquid in step S6 into a preparation kettle, adding an organic solvent, dispersing and grinding for 1 h to 3 h, adding a curing agent and stirring until uniform to obtain the insulating coating; The coupling agent includes one or two of 3-(trimethoxysilyl)propyl acrylate, γ-aminopropyltrimethoxysilane, and γ-(2,3-epoxypropyloxy)propyltrimethoxysilane; the light stabilizer is any one or a combination of triazine ultraviolet absorber UV-405 or benzotriazole ultraviolet absorber UV-328; and the mildew and antibacterial agent is at least one of parahydroxybenzoate, potassium sorbate, and fly ash.

2. The highly self-cleaning and weather-resistant GRTV insulating coating for power equipment according to claim 1, characterized in that: In parts by mass, the organic solvent further includes 20 to 30 parts of n-hexane or 30 to 50 parts of 120# solvent oil.

3. The highly self-cleaning and weather-resistant GRTV insulating coating for electric power equipment according to claim 1, characterized in that: The insulating coating also includes pigment.

4. The highly self-cleaning and weather-resistant GRTV insulating coating for electric power equipment according to claim 2, characterized in that: In parts by mass, the film-forming agent in the insulating coating is composed of 10 to 30 parts of solvent-based fluororesin, 40 to 70 parts of terminal hydroxyl 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 silicon dioxide, 0 to 10 parts of silicon nitride and 5 to 15 parts of fluororesin powder; 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 The invention relates to a novel light stabilizer comprising 3 to 5 parts of 3-(trimethoxysilyl)propyl acrylate and 1 to 3 parts of γ-aminopropyltrimethoxysilane; the light stabilizer comprises 0.5 to 2 parts of triazine ultraviolet absorber UV-405; the mildew and antibacterial agent comprises 0.1 to 0.3 parts of potassium sorbate; the curing agent comprises 3 to 7 parts of methyltriacetamide silane, 1 to 3 parts of dimethyldiacetamide silane and 0.2 to 1 parts of dibutyltin oxide; and the organic solvent comprises 30 to 50 parts of 120# solvent oil and 50 to 100 parts of trichloroethylene.

5. The highly self-cleaning and weather-resistant GRTV insulating coating for electric power equipment according to claim 1, characterized in that: In parts by mass, the film-forming agent in the insulating coating is composed of 30 to 60 parts of solvent-based fluororesin, 20 to 50 parts of terminal hydroxyl polysiloxane, 5 to 15 parts of acrylic resin and 0 to 5 parts of polyether polyol; the reinforcing agent is composed of 10 to 30 parts of silicon dioxide and 10 to 25 parts of fluororesin powder; the filler is composed 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 The invention relates to a novel 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 composed of 1 to 3 parts of parahydroxybenzoate, 3 to 8 parts of fly ash and 0 to 1 part of potassium sorbate, the curing agent is composed of 3 to 7 parts of methyltriacetamide silane, 1 to 3 parts of dimethyldiacetamide silane and 0.2 to 1 part of dibutyltin oxide, and the organic solvent is 60 to 100 parts of trichloroethylene.

6. The highly self-cleaning and weather-resistant GRTV insulating coating for electric power equipment according to claim 2, characterized in that: In terms of parts by mass, the film-forming agent in the 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; and 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 is composed 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 is composed of 5 to 10 parts of ethyl orthosilicate and 0.5 to 2 parts of dibutyltin oxide, and the organic solvent is composed of 20 to 30 parts of n-hexane and 70 to 120 parts of butyl acetate.

7. The highly self-cleaning and weather-resistant GRTV insulating coating for electric power equipment according to claim 2, characterized in that: In parts by mass, the film-forming agent in the insulating coating is composed of 10 to 20 parts of solvent-based fluororesin, 40 to 70 parts of terminal hydroxyl polysiloxane, 20 to 50 parts of acrylic resin and 0 to 5 parts of polyether polyol; the reinforcing agent is composed of 10 to 30 parts of silicon dioxide and 5 to 20 parts of silicon nitride; the filler is composed 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 is composed of 1 to 3 parts of 3-(trimethoxysilyl)propyl The invention is composed of 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 is composed of 3 to 7 parts of methyltriacetamide silane, 1 to 3 parts of dimethyldiacetamide silane and 0.2 to 1 part of dibutyltin oxide, and the organic solvent is composed of 30 to 50 parts of 120# solvent oil and 50 to 100 parts of trichloroethylene.

8. The highly self-cleaning and weather-resistant GRTV insulating coating for electric power equipment according to claim 2, characterized in that: In parts by mass, the film-forming agent in the insulating coating is composed of 30 to 50 parts of solvent-based fluororesin, 30 to 50 parts of terminal hydroxyl polysiloxane, 10 to 20 parts of acrylic resin and 3 to 10 parts of polyether polyol; the reinforcing agent is composed 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 powder; the filler is composed 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 is composed of 2 to 5 parts of γ-aminopropyltrimethoxysilane and 4 to The invention relates to a novel light stabilizer comprising 0.5 to 1 part of a benzotriazole ultraviolet absorber UV-328 and 0.5 to 1 part of a triazine ultraviolet absorber UV-405; the light stabilizer comprises 1 to 3 parts of a parahydroxybenzoate, 3 to 6 parts of fly ash and 0.3 to 0.5 parts of potassium sorbate; the light stabilizer comprises 0.5 to 1 part of a benzotriazole ultraviolet absorber UV-328 and 0.5 to 1 part of a triazine ultraviolet absorber UV-405 ...

9. The highly self-cleaning and weather-resistant GRTV insulating coating for electric power equipment according to claim 2, characterized in that: In parts by mass, the film-forming agent in the insulating coating is composed of 40 parts of solvent-based fluororesin, 45 parts of terminal hydroxyl polysiloxane, 15 parts of acrylic resin and 8 parts of polyether polyol; the reinforcing agent is composed of 12 parts of MQ silicone resin, 18 parts of silicon dioxide, 8 parts of silicon nitride and 12 parts of fluororesin powder; the filler is composed 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 is composed of 3 parts of γ-aminopropyltrimethoxysilane and 6 parts of γ-(2,3 The invention relates to a novel novel novel nanostructured carbonyl silane comprising a nanostructured carbonyl silane (presumably a nanostructured carbonyl silane), ... and a nanostructured carbonyl silane. The nanostructured carbonyl silane comprises a nanostructured carbonyl silane (presumably a nanostructured carbonyl silane), a nanostructured carbonyl silane (presumably a nanostructured carbonyl silane), a nanostructured carbonyl silane (presumably a nanostructured carbonyl silane), and a nanostructured carbonyl silane. The nanostructured carbonyl silane comprises a nanostructured carbonyl silane (presumably a nanostructured carbonyl silane), a nanostructured carbonyl silane (presumably a nanostructured carbonyl silane), a nanostructured carbonyl silane (presumably a nanostructured carbonyl silane), and a nanostructured carbonyl silane. The nanostructured carbonyl silane comprises a nanostructured carbonyl silane (presumably a nanostructured carbonyl silane), a nanostructured carbonyl silane (presumably a nanostructured carbonyl silane), a nanostructured carbonyl silane (presumably a nanostructured carbonyl silane), and a nanostructured carbonyl silane. The nanostructured carbonyl 10. The highly self-cleaning and weather-resistant GRTV insulating coating for electric power equipment according to claim 3, characterized in that: In the step S5, a pigment is further added; in the 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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