Normal-temperature curing high-corrosion-resistance self-lubricating composite coating and preparation method thereof

Abstract

The invention relates to a normal-temperature curing high-corrosion-resistance self-lubricating composite coating which is prepared from the following components in parts by weight: 25 to 35 parts of modified epoxy resin, 12 to 22 parts of waterborne polyurethane-acrylate copolymer, 6 to 14 parts of lubricating filler, 4 to 9 parts of corrosion-resistant filler, 10 to 18 parts of composite curing agent, 1 to 4 parts of dispersing agent, 0.5 to 3.5 parts of flatting agent, 0.8 to 2.5 parts of defoaming agent and 35 to 55 parts of auxiliary solvent. According to the coating disclosed by the invention, an interpenetrating network matrix is constructed through modified epoxy resin and a waterborne polyurethane-acrylate copolymer, and is matched with components such as a nano molybdenum disulfide / graphene composite lubricating filler and a nano titanium dioxide-zinc oxide composite corrosion-resistant filler, and a photoinitiator-amine composite curing agent is combined, so that dual curing is realized. The coating has excellent properties of rapid curing at normal temperature, high corrosion resistance, self-lubrication and the like, is low in VOC content and wide in application range, and provides an innovative solution for the field of surface protection.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and more specifically, to a room-temperature curing, highly corrosion-resistant, self-lubricating composite coating and its preparation method. Background Technology

[0002] In the petroleum industry, from oil and gas field extraction and gathering pipeline laying to oil refining, equipment and pipelines face extremely harsh service environments for extended periods. During extraction, the downhole environment is complex. Acidic gases such as hydrogen sulfide and carbon dioxide in crude oil, as well as highly salinized formation water, can cause severe electrochemical and chemical corrosion to well tubing and production equipment. The oil and gas mixture transported by gathering pipelines often contains a large amount of corrosive media, which can easily lead to pitting corrosion, uniform corrosion, and even stress corrosion cracking on the inner walls of the pipelines. In the oil refining process, high temperatures, high pressures, and the corrosive effects of various chemical reagents also place extremely high demands on the protective coatings of equipment and pipelines.

[0003] Meanwhile, mechanical components in petroleum industry equipment, such as drill pipe joints in drilling equipment and mechanical seals in pumps of oil refineries, experience frequent friction and wear during operation. Traditional single-function coatings are insufficient to meet the comprehensive material protection needs of the petroleum industry. While ordinary corrosion-resistant coatings can resist corrosion to a certain extent, they lack self-lubricating properties, leading to severe wear of mechanical components and high maintenance and replacement costs. Conversely, the insufficient corrosion resistance of self-lubricating coatings makes them ineffective in dealing with the complex corrosive environment of the petroleum industry. Furthermore, the complex on-site construction conditions in the petroleum industry prevent high-temperature curing operations in many areas. Therefore, developing a composite coating that can cure rapidly at room temperature, possesses both high corrosion resistance and self-lubricating properties, and has low VOC content has become a critical problem urgently needing to be solved in the petroleum industry.

[0004] Currently, protective coatings commonly used in the petroleum industry have many limitations in performance. Some corrosion-resistant coatings enhance their corrosion resistance by adding large amounts of rust-inhibiting pigments, but the agglomeration of these pigments severely affects the uniformity and density of the coating, reducing its protective effect. Some self-lubricating coatings use lubricating fillers with poor dispersibility in the coating system, making it difficult to form a stable lubricating film and thus hindering the longevity of their self-lubricating properties. Furthermore, existing coating curing processes are complex and have long curing cycles, which not only affect construction progress but also increase project costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a room temperature curing high corrosion resistance and self-lubricating composite coating and its preparation method. The composite coating can be cured rapidly at room temperature to form a coating with high corrosion resistance and self-lubricating properties, which meets the stringent requirements of different fields for material surface protection.

[0006] The technical solution adopted by this invention to solve its technical problem is: to construct a room-temperature curing, highly corrosion-resistant, self-lubricating composite coating, comprising the following components by weight: 25-35 parts modified epoxy resin, 12-22 parts waterborne polyurethane-acrylate copolymer, 6-14 parts lubricating filler, 4-9 parts corrosion-resistant filler, 10-18 parts composite curing agent, 1-4 parts dispersant, 0.5-3.5 parts leveling agent, 0.8-2.5 parts defoamer, and 35-55 parts auxiliary solvent.

[0007] Preferably, the modified epoxy resin is an epoxy resin synergistically modified with a coupling agent and nano-inorganic particles, wherein the amount of coupling agent is 2%-6% of the epoxy resin mass, and the amount of nano-inorganic particles is 0.3%-1.2% of the epoxy resin mass; the coupling agent is one or more combinations of silane coupling agents, titanate coupling agents, and aluminate coupling agents; and the nano-inorganic particles are at least one of nano-silica and nano-alumina.

[0008] Preferably, the waterborne polyurethane-acrylate copolymer is prepared by emulsion polymerization, wherein the mass ratio of polyurethane prepolymer to acrylate monomer is (3-5):(5-7), and a hydrophilic chain extender is introduced, wherein the hydrophilic chain extender is at least one of dimethylolpropionic acid and dimethylolbutyric acid, and its amount is 4%-9% of the mass of polyurethane prepolymer.

[0009] Preferably, when the lubricating filler is a nano-molybdenum disulfide / graphene composite lubricating filler, the mass ratio of nano-molybdenum disulfide to graphene is (2-6):1. The composite lubricating filler is prepared by a dispersion-thermal processing method, in which graphene is dispersed in an organic solvent, nano-molybdenum disulfide powder is added, and the mixture is dispersed at 40-80°C for 1-2 hours. After separation and drying, the lubricating filler is obtained. The organic solvent is at least one of N,N-dimethylformamide and acetone.

[0010] Preferably, the corrosion-resistant filler, being a nano-titanium dioxide-zinc oxide composite corrosion-resistant filler, is prepared via a sol-gel method. Using titanium and zinc sources as precursors and ethanol as a solvent, hydrolysis and condensation are performed under acidic or alkaline conditions. After drying and calcination, uniform nano-composite particles are obtained. The titanium source is at least one of tetrabutyl titanate and isopropyl titanate; the zinc source is at least one of zinc acetate and zinc nitrate; and the alcohol is at least one of ethanol and isopropanol. The molar ratio of the titanium source to the zinc source is (0.8-2.2):1, the calcination temperature is 350-650℃, and the calcination time is 1-2 hours. The nano-titanium dioxide-zinc oxide composite corrosion-resistant filler exhibits excellent corrosion resistance, effectively blocking the erosion of corrosive media and improving the corrosion resistance of the coating.

[0011] Preferably, the composite curing agent is composed of a photoinitiator and an amine curing agent in a mass ratio of (1-3):(2-4); the photoinitiator is at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) and benzophenone, and the amine curing agent is at least one of triethylenetetramine and ethylenediamine, with the two working synergistically to achieve dual curing. The composite curing agent enables the coating to cure rapidly at room temperature, improving construction efficiency.

[0012] Preferably, the dispersant is one or more of polyacrylate dispersants and polycarboxylate dispersants, and its function is to uniformly disperse the components in the coating and improve the stability of the coating.

[0013] Preferably, the defoamer is one or more of polysiloxane defoamers and mineral oil defoamers, used to eliminate bubbles generated during coating preparation and application, and to ensure coating quality.

[0014] Preferably, the auxiliary solvent is composed of an organic solvent and water, wherein the organic solvent is at least one selected from propylene glycol methyl ether acetate, dipropylene glycol butyl ether, and ethylene glycol butyl ether; and the volume ratio of the organic solvent to water is (4-6):(1-3).

[0015] Preferably, the leveling agent is one or a combination of polyether-modified silicone leveling agents and acrylate leveling agents.

[0016] (1) Add the modified epoxy resin to the reactor and stir at 30-50 °C for 15-30 minutes to ensure that it is fully dispersed and uniform.

[0017] (2) Add dispersant, leveling agent and defoamer in sequence according to the formula amount, and continue stirring for 20-40 minutes to ensure that each additive is fully mixed with the modified epoxy resin.

[0018] (3) Slowly add the waterborne polyurethane-acrylate copolymer into the reactor, controlling the addition rate at 5-10 mL / min, while maintaining the stirring speed at 200-400 r / min. After the addition is complete, stir for 30-60 minutes to form a uniform mixture.

[0019] (4) Add the pre-prepared nano molybdenum disulfide / graphene composite lubricating filler and nano titanium dioxide-zinc oxide composite corrosion resistant filler to the mixture respectively, and ultrasonically disperse them at 60-80 ℃ for 30-60 minutes to make the fillers uniformly dispersed in the mixture.

[0020] (5) After mixing the composite curing agent evenly with the mass ratio of photoinitiator to amine curing agent (1-3):(2-4), add it to the above mixture and stir for 15-30 minutes.

[0021] (6) Finally, add auxiliary solvent to adjust the viscosity of the system to 50-100 s (Ford-4 cup, 25℃), and continue stirring for 20-30 minutes to obtain a room temperature curing high corrosion resistance self-lubricating composite coating.

[0022] The room-temperature curing, high corrosion-resistant, self-lubricating composite coating and its preparation method of the present invention have the following beneficial effects: 1. This invention achieves dual curing of coatings by using photoinitiator-amine composite curing agent, which can quickly cure into a film at room temperature, greatly shortening the construction cycle and improving construction efficiency. At the same time, it avoids the impact of high-temperature curing on the substrate material and expands the application range of coatings.

[0023] 2. The nano-titanium dioxide-zinc oxide composite corrosion-resistant filler exhibits excellent corrosion resistance, effectively blocking the erosion of corrosive media and improving the corrosion resistance of the coating. Simultaneously, the interpenetrating network matrix constructed from modified epoxy resin and waterborne polyurethane-acrylate copolymer possesses good density and adhesion, further enhancing the coating's protective effect on the substrate and significantly extending the material's service life in harsh corrosive environments.

[0024] 3. The nano-molybdenum disulfide / graphene composite lubricant filler works synergistically to effectively reduce the coefficient of friction of the coating, give the coating good self-lubricating properties, reduce wear of parts during friction, and improve the operating efficiency and reliability of the equipment.

[0025] 4. The coating of the present invention has a variety of excellent properties and can be widely used in petroleum engineering, marine engineering, machinery manufacturing, automotive industry and other fields to protect and functionalize the surfaces of various metal and non-metal materials. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention are now described in detail.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the implementation of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Example 1 A room-temperature curing, highly corrosion-resistant, self-lubricating composite coating comprises the following components by weight: 25 parts modified epoxy resin (of which the coupling agent (silane coupling agent) accounts for 2% of the epoxy resin mass, and the nano-inorganic particles (nano-silica) account for 0.3% of the epoxy resin mass), 12 parts waterborne polyurethane-acrylate copolymer (the mass ratio of polyurethane prepolymer to acrylate monomer is 3:5, and the hydrophilic chain extender (dimethylolpropionic acid) accounts for 4% of the polyurethane prepolymer mass), and lubricating filler (nano-molybdenum disulfide / The composition includes: 6 parts of graphene composite lubricating filler (with a mass ratio of nano-molybdenum disulfide to graphene of 2:1); 4 parts of corrosion-resistant filler (nano-titanium dioxide-zinc oxide composite corrosion-resistant filler, with a molar ratio of titanium source (tetrabutyl titanate) to zinc source (zinc acetate) of 0.8:1, calcination temperature of 350℃, and calcination time of 1 hour); 10 parts of composite curing agent (a mixture of photoinitiator (2,4,6-trimethylbenzoyl-diphenylphosphine oxide) and amine curing agent (triethylenetetramine) in a mass ratio of 1:2); 1 part of dispersant (polyacrylate dispersant); 0.5 parts of leveling agent (polyether-modified silicone leveling agent); 0.8 parts of defoamer (polysiloxane defoamer); and 35 parts of auxiliary solvent (organic solvent (propylene glycol methyl ether acetate) in a volume ratio of 4:1 to water).

[0029] The preparation method is as follows: (1) Add the modified epoxy resin to the reactor and stir at 30°C for 15 minutes to ensure that it is fully dispersed and uniform.

[0030] (2) Add dispersant, leveling agent and defoamer in sequence according to the formula amount, and continue stirring for 20 minutes to ensure that each additive is fully mixed with the modified epoxy resin.

[0031] (3) Slowly add the waterborne polyurethane-acrylate copolymer into the reactor, controlling the addition rate at 5 mL / min, while maintaining the stirring speed at 200 r / min. After the addition is complete, stir for another 30 minutes to form a uniform mixture.

[0032] (4) The pre-prepared nano molybdenum disulfide / graphene composite lubricating filler and nano titanium dioxide-zinc oxide composite corrosion resistant filler are added to the mixture and ultrasonically dispersed at 60°C for 30 minutes to make the filler uniformly dispersed in the mixture.

[0033] (5) After mixing the composite curing agent evenly according to the mass ratio of photoinitiator and amine curing agent, add it to the above mixture system and stir for 15 minutes.

[0034] (6) Finally, add auxiliary solvent to adjust the viscosity of the system to 50s (Ford-4 cup, 25℃), and continue stirring for 20 minutes to obtain a room temperature curing high corrosion resistance self-lubricating composite coating.

[0035] Example 2 A room-temperature curing, highly corrosion-resistant, self-lubricating composite coating comprises the following components by weight: 35 parts modified epoxy resin (of which the coupling agent (titanium ester coupling agent) accounts for 6% of the epoxy resin mass, and the nano-inorganic particles (nano-alumina) account for 1.2% of the epoxy resin mass), 22 parts waterborne polyurethane-acrylate copolymer (the mass ratio of polyurethane prepolymer to acrylate monomer is 5:7, and the hydrophilic chain extender (dimethylolbutyric acid) accounts for 9% of the polyurethane prepolymer mass), 14 parts lubricating filler (nano-molybdenum disulfide / graphene composite lubricating filler, the mass ratio of nano-molybdenum disulfide to graphene is 6:1), and 9 parts corrosion-resistant filler (nano-titanium dioxide-zinc oxide composite corrosion-resistant filler, the molar ratio of titanium source (isopropyl titanate) to zinc source (zinc nitrate) is 2.2:1, the calcination temperature is 650℃, and the calcination time is 2 hours). 18 parts of composite curing agent (photoinitiator (benzophenone) and amine curing agent (ethylenediamine) in a mass ratio of 3:4), 4 parts of dispersant (polycarboxylate dispersant), 3.5 parts of leveling agent (acrylate leveling agent), 2.5 parts of defoamer (mineral oil defoamer), and 55 parts of auxiliary solvent (organic solvent (dipropylene glycol butyl ether) and water in a volume ratio of 6:3).

[0036] The preparation method is as follows: (1) Add the modified epoxy resin to the reactor and stir at 50°C for 30 minutes to ensure that it is fully dispersed and uniform.

[0037] (2) Add dispersant, leveling agent and defoamer in sequence according to the formula amount, and continue stirring for 40 minutes to ensure that each additive is fully mixed with the modified epoxy resin.

[0038] (3) Add the waterborne polyurethane-acrylate copolymer slowly into the reactor, controlling the addition rate at 10 mL / min, while maintaining the stirring speed at 400 r / min. After the addition is complete, stir for another 60 minutes to form a uniform mixture.

[0039] (4) The pre-prepared nano molybdenum disulfide / graphene composite lubricating filler and nano titanium dioxide-zinc oxide composite corrosion resistant filler are added to the mixture and ultrasonically dispersed at 80°C for 60 minutes to make the filler uniformly dispersed in the mixture.

[0040] (5) After the composite curing agent is mixed evenly according to the mass ratio of photoinitiator and amine curing agent, it is added to the above-mentioned mixture and stirred for 30 minutes.

[0041] (6) Finally, add auxiliary solvent to adjust the viscosity of the system to 100s (Ford-4 cup, 25℃), and continue stirring for 30 minutes to obtain a room temperature curing high corrosion resistance self-lubricating composite coating.

[0042] Example 3 A room-temperature curing, high-corrosion-resistant, self-lubricating composite coating comprises the following components by weight: 30 parts modified epoxy resin (of which the coupling agent (silane coupling agent and aluminate coupling agent mixed in a 1:1 ratio) accounts for 4% of the epoxy resin mass, and the nano-inorganic particles (nano-silica and nano-alumina mixed in a 1:1 ratio) account for 0.8% of the epoxy resin mass); 18 parts waterborne polyurethane-acrylate copolymer (the mass ratio of polyurethane prepolymer to acrylate monomer is 4:6, and the hydrophilic chain extender (dimethylolpropionic acid and dimethylolbutyric acid mixed in a 1:1 ratio) accounts for 6% of the polyurethane prepolymer mass); and lubricating filler (nano-molybdenum disulfide / The composition includes: 10 parts of graphene composite lubricating filler (with a mass ratio of nano-molybdenum disulfide to graphene of 4:1); 6 parts of corrosion-resistant filler (nano-titanium dioxide-zinc oxide composite corrosion-resistant filler, with a molar ratio of titanium source (tetrabutyl titanate and isopropyl titanate mixed in a 1:1 ratio) to zinc source (zinc acetate and zinc nitrate mixed in a 1:1 ratio) of 1.5:1, calcined at 500℃ for 1.5 hours); and 6 parts of composite curing agent (photoinitiator (2,4,6-trimethylbenzoyl-diphenylphosphine oxide and benzophenone mixed in a 1:1 ratio) and amine curing agent). The mixture contains: 14 parts of a chemical agent (triethylenetetramine and ethylenediamine mixed in a 1:1 ratio, compounded at a mass ratio of 2:3); 2.5 parts of a dispersant (polyacrylate dispersant and polycarboxylate dispersant mixed in a 1:1 ratio); 2 parts of a leveling agent (polyether-modified silicone leveling agent and acrylate leveling agent mixed in a 1:1 ratio); 1.6 parts of a defoamer (polysiloxane defoamer and mineral oil defoamer mixed in a 1:1 ratio); and 45 parts of an auxiliary solvent (organic solvent (propylene glycol methyl ether acetate and dipropylene glycol butyl ether mixed in a 1:1 ratio) and water in a volume ratio of 5:2).

[0043] The preparation method is as follows: (1) Add the modified epoxy resin to the reactor and stir at 40°C for 20 minutes to ensure that it is fully dispersed and uniform.

[0044] (2) Add dispersant, leveling agent and defoamer in sequence according to the formula amount, and continue stirring for 30 minutes to ensure that each additive is fully mixed with the modified epoxy resin.

[0045] (3) Add the waterborne polyurethane-acrylate copolymer slowly into the reactor, controlling the addition rate at 8 mL / min, while maintaining the stirring speed at 300 r / min. After the addition is complete, stir for another 45 minutes to form a uniform mixture.

[0046] (4) The pre-prepared nano molybdenum disulfide / graphene composite lubricating filler and nano titanium dioxide-zinc oxide composite corrosion-resistant filler were added to the mixture and ultrasonicated at 70°C.

[0047] Control group 1: The coating is based on a commercially available epoxy zinc-rich primer, with the main components being 40 parts epoxy resin, 35 parts zinc powder, 10 parts curing agent, 2 parts dispersant, 1 part leveling agent, 1 part defoamer, and 11 parts solvent. The components are mixed thoroughly according to conventional processes to obtain the coating.

[0048] Control group 2: The coating uses polytetrafluoroethylene (PTFE) as the main lubricant and consists of 30 parts acrylic resin, 20 parts PTFE powder, 8 parts curing agent, 3 parts dispersant, 1.5 parts leveling agent, 1.5 parts defoamer, and 36 parts solvent. The PTFE powder is dispersed in the resin system by high-speed stirring to obtain the coating.

[0049] The performance test results of Examples 1-3 and Control Groups 1-2 are shown in Table 1.

[0050] Table 1

[0051] By comparing with the control group, the significant advantages of the room temperature curing high corrosion resistance and self-lubricating composite coating of the present invention in terms of corrosion resistance and self-lubrication, as well as its application potential in the petroleum industry and other fields, are fully verified.

[0052] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A room-temperature curing, highly corrosion-resistant, self-lubricating composite coating, characterized in that, Includes the following components by weight: 25-35 parts modified epoxy resin, 12-22 parts waterborne polyurethane-acrylate copolymer, 6-14 parts lubricating filler, 4-9 parts corrosion-resistant filler, 10-18 parts composite curing agent, 1-4 parts dispersant, 0.5-3.5 parts leveling agent, 0.8-2.5 parts defoamer, and 35-55 parts auxiliary solvent.

2. The room-temperature curing, high corrosion-resistant, self-lubricating composite coating according to claim 1, characterized in that, The modified epoxy resin is an epoxy resin synergistically modified with a coupling agent and nano-inorganic particles. The amount of the coupling agent is 2%-6% of the mass of the epoxy resin, and the amount of the nano-inorganic particles is 0.3%-1.2% of the mass of the epoxy resin. The coupling agent is one or more combinations of silane coupling agents, titanate coupling agents, and aluminate coupling agents. The nano-inorganic particles are at least one of nano-silica and nano-alumina.

3. The room-temperature curing, high corrosion-resistant, self-lubricating composite coating according to claim 1, characterized in that, The waterborne polyurethane-acrylate copolymer is prepared by emulsion polymerization, wherein the mass ratio of polyurethane prepolymer to acrylate monomer is (3-5):(5-7), and a hydrophilic chain extender is introduced, wherein the hydrophilic chain extender is at least one of dimethylolpropionic acid and dimethylolbutyric acid, and its amount is 4%-9% of the mass of polyurethane prepolymer.

4. The room-temperature curing, high corrosion-resistant, self-lubricating composite coating according to claim 1, characterized in that, The lubricating filler is a nano-molybdenum disulfide / graphene composite lubricating filler, with a mass ratio of nano-molybdenum disulfide to graphene of (2-6):

1. The composite lubricating filler is prepared by a dispersion-thermal processing method, in which graphene is dispersed in an organic solvent, nano-molybdenum disulfide powder is added, and the mixture is dispersed at 40-80℃ for 1-2 hours, followed by separation and drying. The organic solvent is at least one of N,N-dimethylformamide and acetone.

5. The room-temperature curing, high corrosion-resistant, self-lubricating composite coating according to claim 1, characterized in that, The corrosion-resistant filler is prepared by a sol-gel method using nano-titanium dioxide-zinc oxide composite corrosion-resistant filler. Titanium and zinc sources are used as precursors, and alcohols are used as solvents. The mixture undergoes hydrolysis and condensation under acidic or alkaline conditions, followed by drying and calcination to obtain uniformly sized nano-composite particles. The titanium source is at least one of tetrabutyl titanate and isopropyl titanate; the zinc source is at least one of zinc acetate and zinc nitrate; and the alcohol is at least one of ethanol and isopropanol. The molar ratio of the titanium source to the zinc source is (0.8-2.2):1, the calcination temperature is 350-650℃, and the calcination time is 1-2 hours.

6. The room-temperature curing, high corrosion-resistant, self-lubricating composite coating according to claim 1, characterized in that, The composite curing agent is composed of a photoinitiator and an amine curing agent in a mass ratio of (1-3):(2-4); the photoinitiator is at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) and benzophenone, and the amine curing agent is at least one of triethylenetetramine and ethylenediamine.

7. The room-temperature curing, high corrosion-resistant, self-lubricating composite coating according to claim 1, characterized in that, The dispersant is one or a combination of polyacrylate dispersants and polycarboxylate dispersants.

8. The room-temperature curing, high corrosion-resistant, self-lubricating composite coating according to claim 1, characterized in that, The defoamer is one or more of polysiloxane defoamers and mineral oil defoamers; the leveling agent is one or more of polyether-modified silicone leveling agents and acrylate leveling agents.

9. The room-temperature curing, high corrosion-resistant, self-lubricating composite coating according to claim 1, characterized in that, The auxiliary solvent includes an organic solvent and water, wherein the organic solvent is at least one of propylene glycol methyl ether acetate, dipropylene glycol butyl ether, and ethylene glycol butyl ether; and the volume ratio of the organic solvent to water is (4-6):(1-3).

10. A method for preparing a room-temperature curing, high corrosion-resistant, self-lubricating composite coating as described in claim 1, characterized in that, Includes the following steps: (1) Add the modified epoxy resin to the reactor and stir at 30-50℃ for 15-30 minutes to ensure that it is fully dispersed and uniform; (2) Add dispersant, leveling agent and defoamer in sequence according to the formula amount, and continue stirring for 20-40 minutes to ensure that each additive is fully mixed with the modified epoxy resin; (3) Slowly add the waterborne polyurethane-acrylate copolymer into the reactor, controlling the addition rate at 5-10 mL / min, while maintaining the stirring speed at 200-400 r / min. After the addition is complete, stir for 30-60 minutes to form a uniform mixture. (4) Add the pre-prepared nano molybdenum disulfide / graphene composite lubricating filler and nano titanium dioxide-zinc oxide composite corrosion-resistant filler to the mixture respectively, and ultrasonically disperse them at 60-80℃ for 30-60 minutes to make the fillers uniformly dispersed in the mixture. (5) After mixing the composite curing agent evenly with the mass ratio of photoinitiator to amine curing agent (1-3):(2-4), add it to the above mixture and stir for 15-30 minutes; (6) Finally, add auxiliary solvent to adjust the viscosity of the system to 50-100s, and continue stirring for 20-30 minutes to obtain a room temperature curing high corrosion resistance self-lubricating composite coating.

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