Solvent-free high-temperature-resistant insulating paint capable of being sprayed in electrified manner and preparation method thereof

Abstract

The invention belongs to the technical field of insulating coatings, and particularly relates to a solvent-free high-temperature-resistant insulating coating capable of being sprayed in an electrified mode and a preparation method of the solvent-free high-temperature-resistant insulating coating. The main agent mainly comprises self-made organic silicon modified epoxy resin, pigment, modified functional filler, antirust filler, a functional flame retardant and a coalescing agent. According to the invention, high-resistivity silicon nitride, aluminum nitride, boron nitride and low-melting-point glass powder are selected and mixed according to a certain proportion, and hyperbranched treatment is carried out on the mixture, so that the compatibility, compactness and corrosion resistance of a coating are improved, and the resistance value and compression strength of the liquid coating are also improved; the paint does not contain volatile organic compounds (VOCs), reduces pollution to the atmosphere, is friendly to the environment and constructors, avoids potential safety hazards, possibly caused by solvent volatilization, of a construction site, and meets the requirements of modern environmental protection.

Description

Technical Field

[0001] The invention relates to insulating coatings in the technical field of chemical engineering, and in particular to a solvent-free high-temperature resistant insulating coating capable of being sprayed with electricity and a preparation method thereof. Background Art

[0002] In modern power systems, conductors such as wires, low-voltage busbars, and disconnectors are key components for power distribution and transmission, and their safe and reliable operation is crucial. With the continuous growth of power demand and the increasingly complex operating environment of power equipment, higher requirements are placed on the insulation performance of electrical equipment and facilities such as wires, low-voltage busbars, and disconnectors. As an important insulating protective material, insulating coatings can effectively improve their insulation performance and ensure the stable operation of power systems. The insulation performance of electrical equipment and facilities such as wires, low-voltage busbars, and disconnectors is one of the key factors to ensure the safe and stable operation of power systems, but there are also a series of problems and challenges in this regard. For example, busbars are usually coated with insulating sheaths, RTV insulating coatings, and solvent-based insulating coatings to improve their insulation properties to ensure safety and prevent short circuits. Since the low-voltage busbars operate in a high temperature environment of 120℃-200℃ for a long time in summer, the insulating sheaths and RTV insulating coatings will age abnormally, and their service life often falls off and cracks before reaching 5 years. Solvent-based insulating coatings are not resistant to high temperatures, the coating is not dense, and its compressive strength is not high. At the same time, multiple coatings are required to reach the specified coating thickness and a large amount of VOCs (volatile organic compounds) are volatilized, which not only causes serious pollution to the surrounding environment, but also increases the construction cost and construction period. In addition, bird damage, bird nests, animals, and insulation sheath grounding points that are not staggered or are less than 1m apart cause line tripping to account for about 40% of the total tripping throughout the year. In addition, insulation sheaths, RTV insulating coatings, and solvent-based insulating coatings often require power outages for construction. For some important facilities, industrial sites, or residential areas that cannot be powered off for a long time, it will cause production stagnation, equipment damage, inconvenience in life, and many other problems.

[0003] In response to these problems, the present invention provides a solvent-free, high-temperature resistant insulating coating that can be sprayed under power. No power outage is required, and a high coating thickness can be achieved in one coating. The coating can operate for a long time in a high-temperature and high-humidity environment above 200°C, and can achieve a design life of more than 10 years. The coating can effectively improve the insulation performance of electrical equipment and facilities such as conductors, low-voltage busbars, and disconnectors, and avoid line tripping caused by bird damage, bird nests, animals, etc., thereby ensuring the normal and stable operation of the power system. Summary of the invention

[0004] The main purpose of the present disclosure is to provide a solvent-free high-temperature resistant insulating coating that can be sprayed with electricity and a preparation method thereof, so as to effectively solve the problems raised by the inventor in the above-mentioned background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: A solvent-free high-temperature resistant insulating coating capable of being sprayed with electricity, comprising a main agent and a curing agent; The main agent is mainly composed of homemade silicone modified epoxy resin, pigment, modified functional filler, anti-rust filler, functional flame retardant, and film-forming aid; The pigment is rutile titanium dioxide R219, which has high hiding power and high temperature resistance of more than 500°C, and the mass proportion of rutile titanium dioxide R219 in the main agent is 5.5%-10.5%; The modified functional filler is mainly composed of silicon nitride, aluminum nitride, boron nitride and low melting point glass powder mixed in a certain gradient ratio, and its resistivity is ≥10 12 Ω·m, high temperature resistance ≥500℃, purity ≥99%, particle size 1500-2000 mesh, low melting point glass powder 500-750℃, its insulation is the best, the mixing ratio of the modified functional filler is 1:1:1:1-3:4:4:4, and the mass proportion of the modified functional filler in the main agent is 10%-30%; The anti-rust filler is one or more of zinc phosphate ZP409 and aluminum tripolyphosphate TP-303, wherein the phosphate ions in zinc phosphate ZP409 and aluminum tripolyphosphate TP-303 can react with the substrate to generate a dense passivation film, effectively improving the density and permeability resistance of the coating, and increasing the corrosion resistance of the coating. The mass proportion of the anti-rust filler in the main agent is 3%-10%; The functional flame retardant is a halogen-free flame retardant DOPO, which is halogen-free, smoke-free, non-toxic, non-migrating, and has a long-lasting flame retardant effect. The biphenyl ring and phenanthrene ring structure in the molecular structure of the halogen-free flame retardant DOPO, as well as the cyclic O=PO bond, make its thermal stability and chemical stability better play a flame retardant role at high temperature, and can release free radical scavenging substances, improve residue formation, and effectively prevent material combustion. The mass proportion of the functional flame retardant in the main agent is 15%-30%; The film-forming aid is composed of one or more of a rheological aid, a toughening agent, a dispersant, a leveling agent, and a defoaming agent, and the mass proportion of the film-forming aid in the main agent is 3%-15%; The curing agent is a low-viscosity, solvent-free, high-temperature resistant special modified amine curing agent; The curing agent is a special modified amine curing agent SY1124B, which has a low viscosity of 200-500mPa·s. After being mixed with the main agent, it effectively improves the overall viscosity of the coating, has a solid content of up to 99.9%, is resistant to high temperatures of ≥300°C, has a liquid resistance of more than 10GΩ per centimeter, and has higher weather resistance, salt spray resistance, water resistance and heat resistance than ordinary epoxy amine curing agents, effectively extending the service life of the cured coating under high temperature conditions; The mass ratio of the main agent to the curing agent is 2:1-6:1.

[0006] Preferably, the rheological additive is selected from Arkema OPTIMA polyamide wax powder and hydrophobic fumed silica 812S, which are mixed in a certain proportion and used synergistically to effectively improve the rheological properties and storage properties of the coating. The mass proportion of the rheological additive in the main agent is 0.8%-3.0%, and the mass ratio of the Arkema OPTIMA polyamide wax powder and the hydrophobic fumed silica 812S is 4:1-1:1.

[0007] Preferably, the toughening agent is epoxy-terminated polysulfide EPS100, which effectively improves the flexibility of the silicone-modified epoxy resin and enhances the adhesion between the coating and the substrate. The mass proportion of the epoxy-terminated polysulfide EPS100 in the main agent is 0.5%-3.5%.

[0008] Preferably, the dispersant is one of TEGO1010, BYK2013 and BYK2062, and the mass proportion of the dispersant in the main agent is 0.5%-2.0%.

[0009] Preferably, the leveling agent is selected from one of BYK358N, BYK361N and BYK356, and the mass proportion of the leveling agent in the main agent is 0.3%-2.0%.

[0010] Preferably, the defoamer is selected from one of TEGO900, BYK A530, and EFKA-2022, and the mass proportion of the defoamer in the main agent is 0.1%-1.0%.

[0011] Preferably, the coating can be applied on a charged conductive substrate, provided that the coating liquid is non-flammable, the coating is non-flammable, and the coating resistance is required to be above 100MΩ per centimeter, which can meet the construction requirements of charged spraying above 10kV.

[0012] Preferably, the silicon nitride, aluminum nitride, boron nitride, and low-melting-point glass powder are all chemically inert, have relatively weak bonding with the resin matrix, relatively poor compatibility, are easily aggregated, and are difficult to disperse evenly in the silicone-modified epoxy resin. The silane coupling agent SF-H560 is used to perform hyperbranching treatment on them, and hydroxyl groups are grafted on their surfaces to enhance compatibility with the resin, thereby improving the density and compressive strength of the coating.

[0013] A method for preparing a solvent-free high-temperature resistant insulating coating that can be sprayed with electricity, wherein the method for preparing the organosilicon-modified epoxy resin is as follows: S91: Select solid epoxy resin E20, whose epoxy value is between 0.18-0.22, add 30-60 parts of solid epoxy resin E20 and 40-50 parts of xylene in the reaction kettle, turn on the stirrer, and then slowly heat to raise the temperature to 100-120°C until the molecular chain of solid epoxy resin E20 gradually expands and completely dissolves in xylene, keep the speed at 300-500r / min, disperse for 30-40 minutes, take samples to measure the solid content, and obtain epoxy resin E20 liquid with a solid content of 50%-60%, cool to room temperature, filter and set aside; S92: In a three-necked flask with a stirrer and a thermometer, first add 40-70 parts of epoxy resin E20 liquid, stir at a low speed of 300-500 r / min, add 20-30 parts of polymethylsiloxane while stirring, fill with nitrogen during the process, disperse for 20-30 minutes, then slowly raise the temperature to 50°C-70°C, drop 0.1-0.4 parts of dibutyltin dilaurate as a catalyst, and drip it within 1-2 minutes, finally raise the temperature to 100-120°C, and carry out polycondensation reaction for 6-7 hours to obtain a silicone-modified epoxy resin; S93: Raise the temperature to 150-180℃ again, add 0.1-0.3 parts of 3A molecular sieve to remove moisture from the modified resin, evaporate excess xylene, and measure the viscosity to be 7000-10000mPa·s, moisture ≤0.5%, solid content ≥99.9%, liquid non-flammable, resistance ≥49.9GΩ, etc. If the data are qualified, the solvent-free silicone modified epoxy resin can be obtained.

[0014] Preferably, the specific process of hyperbranching treatment is as follows: S101: Weigh a certain mass portion of functional fillers, namely silicon nitride, aluminum nitride, boron nitride, and low-melting-point glass powder, respectively, with a mixing mass ratio of 1:1:1:1-3:4:4:4, and place them at a temperature of 100-120° C. for 12-24 hours to remove surface moisture; S102: In a three-necked flask equipped with a stirrer and a thermometer, take 80-100 parts of the dried functional filler mixture, add it to 500-600 parts of anhydrous ethanol, stir at a low speed of 300-500 r / min for 15-20 minutes, fill with nitrogen during the period, then raise the temperature to 50-70°C, add 5-10 parts of silane coupling agent SF-H560 dropwise, and react for 20-24 hours; S103: After the reaction is completed, the mixture is cooled to room temperature and filtered, and then washed repeatedly with anhydrous ethanol for at least three times, and finally placed at 100-120° C. to dry for 12-24 hours to obtain a hyperbranched functional mixed filler.

[0015] In view of this, compared with the prior art, the beneficial effects of the present invention are: (I) The present invention adopts a self-made solvent-free organosilicon-modified epoxy resin, which has the characteristics of high liquid resistance, non-flammability, high temperature resistance, and solvent-free, providing key basic conditions for the insulation and charged spraying of coatings and coatings.

[0016] (ii) The present invention selects high-resistance silicon nitride, aluminum nitride, boron nitride, and low-melting-point glass powder, mixes them in a certain proportion, and performs a hyperbranching treatment on them, thereby not only increasing the compatibility, density, and corrosion resistance of the coating, but also increasing the resistance value of the liquid coating and the compressive strength of the coating.

[0017] (III) The present invention has excellent insulation performance and can effectively prevent the conduction of current even in a high temperature and high humidity environment above 200°C, thus avoiding failures due to short circuit discharge and other problems.

[0018] (IV) Compared with the traditional solvent-based insulating coatings, the present invention does not contain volatile organic compounds (VOCs), reduces air pollution, is friendly to construction workers, and also avoids the potential safety hazards at the construction site caused by solvent volatilization, meeting the requirements of modern environmental protection.

[0019] (V) The present invention has the characteristics of being sprayable with electricity, high coating resistance, non-flammability, high coating and coating compressive strength, etc., which provides convenient conditions for non-stop maintenance of electrical equipment and facilities, not only saving huge economic losses caused by power outages, but also timely repairing damage to the insulation layer, effectively preventing the occurrence of insulation failures. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The present invention provides the following embodiments: A solvent-free high-temperature resistant insulating coating capable of being sprayed with electricity, comprising a main agent and a curing agent; The main agent is mainly composed of homemade silicone modified epoxy resin, pigment, modified functional filler, anti-rust filler, functional flame retardant and film-forming aid; The pigment is rutile titanium dioxide R219, which has high hiding power and high temperature resistance of over 500°C. The mass proportion of rutile titanium dioxide R219 in the main agent is 5.5%-10.5%; The modified functional filler is mainly composed of silicon nitride, aluminum nitride, boron nitride and low melting point glass powder mixed in a certain gradient ratio, and its resistivity is ≥10 12 Ω·m, high temperature resistance ≥500℃, purity ≥99%, particle size 1500-2000 mesh, low melting point glass powder 500-750℃, its insulation is the best, the mixing ratio of modified functional filler is 1:1:1:1-3:4:4:4, and the mass proportion of modified functional filler in the main agent is 10%-30%; The anti-rust filler adopts one or more of zinc phosphate ZP409 and aluminum tripolyphosphate TP-303. The phosphate ions in zinc phosphate ZP409 and aluminum tripolyphosphate TP-303 can react with the substrate to generate a dense passivation film, which effectively improves the density and permeability resistance of the coating and increases the corrosion resistance of the coating. The mass proportion of the anti-rust filler in the main agent is 3%-10%; The functional flame retardant is halogen-free flame retardant DOPO, which is halogen-free, smoke-free, non-toxic, non-migrating, and has a long-lasting flame retardant effect. The biphenyl ring and phenanthrene ring structure in the molecular structure of the halogen-free flame retardant DOPO, as well as the cyclic O=PO bond, make its thermal stability and chemical stability better play a flame retardant role at high temperatures, and can release free radical scavenging substances, improve residue formation, and effectively prevent material combustion. The mass proportion of functional flame retardants in the main agent is 15%-30%; The film-forming agent is composed of one or more of a rheological agent, a toughening agent, a dispersant, a leveling agent, and a defoaming agent. The mass proportion of the film-forming agent in the main agent is 3%-15%; The curing agent is a low-viscosity, solvent-free, high-temperature resistant special modified amine curing agent; The curing agent is a special modified amine curing agent SY1124B, which has a low viscosity of 200-500mPa·s. After mixing with the main agent, it can effectively improve the overall viscosity of the coating. The solid content is as high as 99.9%, and the high temperature resistance is ≥300℃. The liquid resistance is above 10GΩ per centimeter. The weather resistance, salt spray resistance, water resistance and heat resistance are higher than those of ordinary epoxy amine curing agents, which effectively prolongs the service life of the cured coating under high temperature conditions. The mass ratio of the main agent to the curing agent is 2:1-6:1.

[0022] Specifically, the rheological additives are Arkema OPTIMA polyamide wax powder and hydrophobic fumed silica 812S. The two are mixed in a certain proportion and used synergistically to effectively improve the rheology and storage properties of the coating. The mass proportion of the rheological additive in the main agent is 0.8%-3.0%, and the mass ratio of Arkema OPTIMA polyamide wax powder and hydrophobic fumed silica 812S is 4:1-1:1.

[0023] Specifically, the toughening agent is epoxy-terminated polysulfide EPS100, which effectively improves the flexibility of silicone-modified epoxy resin and enhances the adhesion between the coating and the substrate. The mass proportion of epoxy-terminated polysulfide EPS100 in the main agent is 0.5%-3.5%.

[0024] Specifically, the dispersant is selected from TEGO1010, BYK2013, and BYK2062, and the mass proportion of the dispersant in the main agent is 0.5%-2.0%.

[0025] Specifically, the leveling agent is selected from BYK358N, BYK361N, and BYK356, and the mass proportion of the leveling agent in the main agent is 0.3%-2.0%.

[0026] Specifically, the defoamer is selected from one of TEGO900, BYK A530, and EFKA-2022, and the mass proportion of the defoamer in the main agent is 0.1%-1.0%.

[0027] Specifically, the paint can be applied on a charged conductive substrate, provided that the paint liquid is non-flammable, the coating is non-flammable, and the paint resistance is required to be above 100MΩ per centimeter, which can meet the construction requirements of live spraying above 10kV.

[0028] Specifically, silicon nitride, aluminum nitride, boron nitride, and low-melting-point glass powder are all chemically inert, have relatively weak bonding with the resin matrix, relatively poor compatibility, are easily aggregated, and are difficult to disperse evenly in the silicone-modified epoxy resin. The silane coupling agent SF-H560 is used to hyperbranch them and graft hydroxyl groups on their surfaces to enhance compatibility with the resin and improve the density and compressive strength of the coating.

[0029] A method for preparing a solvent-free high-temperature resistant insulating coating that can be sprayed with electricity, and a method for preparing an organosilicon-modified epoxy resin are as follows: S91: Select solid epoxy resin E20, whose epoxy value is between 0.18-0.22, add 30-60 parts of solid epoxy resin E20 and 40-50 parts of xylene in the reaction kettle, turn on the stirrer, and then slowly heat to raise the temperature to 100-120°C until the molecular chain of solid epoxy resin E20 gradually expands and completely dissolves in xylene, keep the speed at 300-500r / min, disperse for 30-40 minutes, take samples to measure the solid content, and obtain epoxy resin E20 liquid with a solid content of 50%-60%, cool to room temperature, filter and set aside; S92: In a three-necked flask with a stirrer and a thermometer, first add 40-70 parts of epoxy resin E20 liquid, stir at a low speed of 300-500 r / min, add 20-30 parts of polymethylsiloxane while stirring, fill with nitrogen during the process, disperse for 20-30 minutes, then slowly raise the temperature to 50°C-70°C, drop 0.1-0.4 parts of dibutyltin dilaurate as a catalyst, and drip it within 1-2 minutes, finally raise the temperature to 100-120°C, and carry out polycondensation reaction for 6-7 hours to obtain a silicone-modified epoxy resin; S93: Raise the temperature to 150-180℃ again, add 0.1-0.3 parts of 3A molecular sieve to remove moisture from the modified resin, evaporate excess xylene, and measure the viscosity to be 7000-10000mPa·s, moisture ≤0.5%, solid content ≥99.9%, liquid non-flammable, resistance ≥49.9GΩ, etc. If the data are qualified, the solvent-free silicone modified epoxy resin can be obtained.

[0030] Specifically, the specific process of hyperbranching treatment is as follows: S101: Weigh a certain mass portion of functional fillers, namely silicon nitride, aluminum nitride, boron nitride, and low-melting-point glass powder, respectively, with a mixing mass ratio of 1:1:1:1-3:4:4:4, and place them at a temperature of 100-120° C. for 12-24 hours to remove surface moisture; S102: In a three-necked flask equipped with a stirrer and a thermometer, take 80-100 parts of the dried functional filler mixture, add it to 500-600 parts of anhydrous ethanol, stir at a low speed of 300-500 r / min for 15-20 minutes, fill with nitrogen during the period, then raise the temperature to 50-70°C, add 5-10 parts of silane coupling agent SF-H560 dropwise, and react for 20-24 hours; S103: After the reaction is completed, the mixture is cooled to room temperature and filtered, and then washed repeatedly with anhydrous ethanol for at least three times, and finally placed at 100-120° C. to dry for 12-24 hours to obtain a hyperbranched functional mixed filler.

[0031] Embodiment 1 The composition of the main agent is as follows: The preparation process of the main agent is as follows: First, add silicone-modified epoxy resin, epoxy-terminated polysulfide EPS100, dispersant BYK2013, leveling agent BYK358N, and defoamer TEGO900 into the reactor, then reduce the speed to mix evenly and disperse at low speed for 20-30 minutes; Then heat it to 55-65℃ and keep it warm. If the temperature exceeds 65℃, cool it down to 55-65℃ with condensed circulating water. Then add OPTIMA polyamide wax powder and Evonik's hydrophobic fumed silica 812S, disperse it at high speed for 40-60 minutes, and keep it warm at 55-65℃ during the dispersion. Finally, add titanium dioxide R219, functional filler, anti-rust filler zinc phosphate, and functional flame retardant DOPO, disperse at high speed for 40-60 minutes, sand grind to a fineness of ≤60um, filter and package to obtain the solvent-free high-temperature resistant insulating coating main agent.

[0032] Specifically, the curing agent formula is as follows: Finally, the main agent and curing agent are evenly mixed in a mass ratio of 3:1, and the coating is evenly applied on the test panel by high-pressure airless spraying or brushing. The coating is cured at room temperature of 23±2℃ and humidity of 50±5%. After the coating is completely cured for at least 14 days, its performance is tested.

[0033] Embodiment 2 The composition of the main agent is as follows: The preparation process of the main agent is as follows: First, add silicone-modified epoxy resin, epoxy-terminated polysulfide EPS100, dispersant BYK2013, leveling agent BYK361N, and defoamer BYK A530 into the reactor, then reduce the speed to mix evenly and disperse at low speed for 20-30 minutes; Then heat it to 55-65℃ and keep it warm. If the temperature exceeds 65℃, cool it down to 55-65℃ with condensed circulating water. Then add OPTIMA polyamide wax powder and Evonik's hydrophobic fumed silica 812S, disperse it at high speed for 40-60 minutes, and keep it warm at 55-65℃ during the dispersion. Finally, add titanium dioxide R219, functional filler, anti-rust filler aluminum tripolyphosphate, and functional flame retardant DOPO, disperse at high speed for 40-60 minutes, sand grind to a fineness of ≤60um, filter and package to obtain the solvent-free high-temperature resistant insulating coating main agent.

[0034] Preferably, the curing agent formula is as follows: Finally, the main agent and curing agent are evenly mixed in a mass ratio of 4:1, and the coating is evenly applied on the test plate by high-pressure airless spraying or brushing. After the coating is cured at room temperature 23±2℃ and humidity 50±5% for at least 14 days and completely cured, its performance is tested.

[0035] Embodiment 3 The composition of the main agent is as follows: The preparation process of the main agent is as follows: First, add silicone-modified epoxy resin, epoxy-terminated polysulfide EPS100, dispersant TEGO1010, leveling agent BYK358N, and defoamer TEGO900 into the reactor, then reduce the speed to mix evenly and disperse at low speed for 20-30 minutes; Then heat it to 55-65℃ and keep it warm. If the temperature exceeds 65℃, cool it down to 55-65℃ with condensed circulating water. Then add OPTIMA polyamide wax powder and Evonik's hydrophobic fumed silica 812S, disperse it at high speed for 40-60 minutes, and keep it warm at 55-65℃ during the dispersion. Finally, add titanium dioxide R219, functional filler, anti-rust filler zinc phosphate, aluminum tripolyphosphate, and functional flame retardant DOPO, disperse at high speed for 40-60 minutes, sand grind to a fineness of ≤60um, filter and package to obtain the solvent-free high-temperature resistant insulating coating main agent.

[0036] Preferably, the curing agent formula is as follows: Finally, the main agent and curing agent are evenly mixed in a mass ratio of 5:1, and the coating is evenly applied on the test board by high-pressure airless spraying or brushing. After the coating is cured at room temperature 23±2℃ and humidity 50±5% for at least 14 days and completely cured, its performance is tested.

[0037] Test Results According to the above test data, the solvent-free high-temperature insulating coating prepared by the present invention that can be sprayed with electricity has a liquid resistance of more than 1 GΩ per centimeter, the liquid coating is non-flammable, and the coating is non-flammable, which meets the requirements of live working. In addition, the coating has a sag resistance of more than 1075um, and a higher coating thickness can be achieved with one spray, saving a lot of construction period and cost. At the same time, the compressive strength of the solvent-free high-temperature insulating coating in dry, wet, high-temperature and high-humidity environments is more than 30kV / mm, and it can operate for a long time in extreme environments of high temperature and high humidity above 300°C, meeting the insulation requirements of electrical equipment such as low-voltage busbars, conductors, and disconnectors. In addition, it has strong corrosion resistance such as acid resistance, alkali resistance, salt water resistance, and salt spray resistance, and has a long-term durability, which can effectively guarantee the normal and stable operation of the power system.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A solvent-free high temperature resistant insulating coating that can be sprayed with electricity, characterized in that: Including main agent and curing agent; The main agent is mainly composed of homemade silicone modified epoxy resin, pigment, modified functional filler, anti-rust filler, functional flame retardant, and film-forming aid; The pigment is rutile titanium dioxide R219, which has high hiding power and high temperature resistance of more than 500°C, and the mass proportion of rutile titanium dioxide R219 in the main agent is 5.5%-10.5%; The modified functional filler is mainly composed of silicon nitride, aluminum nitride, boron nitride and low melting point glass powder mixed in a certain gradient ratio, and its resistivity is ≥10 12 Ω·m, high temperature resistance ≥500℃, purity ≥99%, particle size 1500-2000 mesh, low melting point glass powder 500-750℃, its insulation is the best, the mixing ratio of the modified functional filler is 1:1:1:1-3:4:4:4, and the mass proportion of the modified functional filler in the main agent is 10%-30%; The anti-rust filler is one or more of zinc phosphate ZP409 and aluminum tripolyphosphate TP-303, wherein the phosphate ions in zinc phosphate ZP409 and aluminum tripolyphosphate TP-303 can react with the substrate to generate a dense passivation film, effectively improving the density and permeability resistance of the coating, and increasing the corrosion resistance of the coating. The mass proportion of the anti-rust filler in the main agent is 3%-10%; The functional flame retardant is a halogen-free flame retardant DOPO, which is halogen-free, smoke-free, non-toxic, non-migrating, and has a long-lasting flame retardant effect. The biphenyl ring and phenanthrene ring structure in the molecular structure of the halogen-free flame retardant DOPO, as well as the cyclic O=PO bond, make its thermal stability and chemical stability better play a flame retardant role at high temperature, and can release free radical scavenging substances, improve residue formation, and effectively prevent material combustion. The mass proportion of the functional flame retardant in the main agent is 15%-30%; The film-forming aid is composed of one or more of a rheological aid, a toughening agent, a dispersant, a leveling agent, and a defoaming agent, and the mass proportion of the film-forming aid in the main agent is 3%-15%; The curing agent is a low-viscosity, solvent-free, high-temperature resistant special modified amine curing agent; The curing agent is a special modified amine curing agent SY1124B, which has a low viscosity of 200-500mPa·s. After being mixed with the main agent, it effectively improves the overall viscosity of the coating, has a solid content of up to 99.9%, is resistant to high temperatures of ≥300°C, has a liquid resistance of more than 10GΩ per centimeter, and has higher weather resistance, salt spray resistance, water resistance and heat resistance than ordinary epoxy amine curing agents, effectively extending the service life of the cured coating under high temperature conditions; The mass ratio of the main agent to the curing agent is 2:1-6:

1.

2. The solvent-free high temperature resistant insulating coating capable of being sprayed with electricity according to claim 1, characterized in that: The rheological additive is Arkema OPTIMA polyamide wax powder and hydrophobic fumed silica 812S, which are mixed in a certain proportion and used synergistically to effectively improve the rheological properties and storage properties of the coating. The mass proportion of the rheological additive in the main agent is 0.8%-3.0%, and the mass ratio of Arkema OPTIMA polyamide wax powder and hydrophobic fumed silica 812S is 4:1-1:

1.

3. The solvent-free high temperature resistant insulating coating capable of being sprayed with electricity according to claim 1, characterized in that: The toughening agent is epoxy-terminated polysulfide EPS100, which effectively improves the flexibility of the silicone-modified epoxy resin and enhances the adhesion between the coating and the substrate. The mass proportion of the epoxy-terminated polysulfide EPS100 in the main agent is 0.5%-3.5%.

4. The solvent-free high temperature resistant insulating coating capable of being sprayed with electricity according to claim 1, characterized in that: The dispersant is selected from one of TEGO1010, BYK2013, and BYK2062, and the mass proportion of the dispersant in the main agent is 0.5%-2.0%.

5. The solvent-free high temperature resistant insulating coating capable of being sprayed with electricity according to claim 1, characterized in that: The leveling agent is selected from one of BYK358N, BYK361N and BYK356, and the mass proportion of the leveling agent in the main agent is 0.3%-2.0%.

6. The solvent-free high temperature resistant insulating coating capable of being sprayed with electricity according to claim 1, characterized in that: The defoamer is selected from one of TEGO900, BYK A530 and EFKA-2022, and the mass proportion of the defoamer in the main agent is 0.1%-1.0%.

7. The solvent-free high temperature resistant insulating coating capable of being sprayed with electricity according to claim 1, characterized in that: The paint can be applied on a charged conductive substrate, provided that the paint liquid is non-flammable, the coating is non-flammable, and the paint resistance is required to be above 100MΩ per centimeter, which can meet the construction requirements of live spraying above 10kV.

8. The solvent-free high temperature resistant insulating coating capable of being sprayed with electricity according to claim 1, characterized in that: The silicon nitride, aluminum nitride, boron nitride, and low-melting-point glass powder are all chemically inert, have relatively weak bonding with the resin matrix, relatively poor compatibility, are easily aggregated, and are difficult to disperse evenly in the silicone-modified epoxy resin. The silane coupling agent SF-H560 is used to hyperbranch them and graft hydroxyl groups on their surfaces to enhance compatibility with the resin and improve the density and compressive strength of the coating.

9. The method for preparing a solvent-free high temperature resistant insulating coating capable of being sprayed with electricity according to claims 1-8, characterized in that: The preparation method of the organosilicon-modified epoxy resin is as follows: S91: Select solid epoxy resin E20, whose epoxy value is between 0.18-0.22, add 30-60 parts of solid epoxy resin E20 and 40-50 parts of xylene in the reaction kettle, turn on the stirrer, and then slowly heat to raise the temperature to 100-120°C until the molecular chain of solid epoxy resin E20 gradually expands and completely dissolves in xylene, keep the speed at 300-500r / min, disperse for 30-40 minutes, take samples to measure the solid content, and obtain epoxy resin E20 liquid with a solid content of 50%-60%, cool to room temperature, filter and set aside; S92: In a three-necked flask with a stirrer and a thermometer, first add 40-70 parts of epoxy resin E20 liquid, stir at a low speed of 300-500 r / min, add 20-30 parts of polymethylsiloxane while stirring, fill with nitrogen during the process, disperse for 20-30 minutes, then slowly raise the temperature to 50°C-70°C, drop 0.1-0.4 parts of dibutyltin dilaurate as a catalyst, and drip it within 1-2 minutes, finally raise the temperature to 100-120°C, and carry out polycondensation reaction for 6-7 hours to obtain a silicone-modified epoxy resin; S93: Raise the temperature to 150-180°C again, add 0.1-0.3 parts of 3A molecular sieve to remove moisture from the modified resin, evaporate excess xylene, and measure the viscosity at 7000-10000mPa·s, moisture ≤0.5%, solid content ≥99.9%, liquid non-flammable, resistance ≥49.9GΩ, etc. If the test is qualified, the solvent-free silicone modified epoxy resin can be obtained.

10. The method for preparing a solvent-free high temperature resistant insulating coating capable of being sprayed with electricity according to claim 9, characterized in that: The specific process of the hyperbranching treatment is as follows: S101: Weigh a certain mass portion of functional fillers, namely silicon nitride, aluminum nitride, boron nitride, and low-melting-point glass powder, respectively, with a mixing mass ratio of 1:1:1:1-3:4:4:4, and place them at a temperature of 100-120° C. for 12-24 hours to remove surface moisture; S102: In a three-necked flask equipped with a stirrer and a thermometer, take 80-100 parts of the dried functional filler mixture, add it to 500-600 parts of anhydrous ethanol, stir at a low speed of 300-500 r / min for 15-20 minutes, fill with nitrogen during the period, then raise the temperature to 50-70°C, add 5-10 parts of silane coupling agent SF-H560 dropwise, and react for 20-24 hours; S103: After the reaction is completed, the mixture is cooled to room temperature and filtered, and then washed repeatedly with anhydrous ethanol for at least three times, and finally placed at 100-120° C. to dry for 12-24 hours to obtain a hyperbranched functional mixed filler.

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