Spray / dip-coating dual-purpose thin-layer high-temperature-resistant anti-icing anticorrosive coating as well as preparation method and application thereof

Abstract

The invention provides a spraying / dip-coating dual-purpose thin-layer high-temperature-resistant anti-icing anticorrosive coating as well as a preparation method and application thereof. The coating is prepared from a component A and a component B, the component A is prepared from raw material components including organic silicon modified polyurethane resin, fluorocarbon resin, hydrophobic high-hardness filler, lubricating filler, a flatting agent and an organic solvent; the component B is prepared from raw material components including isocyanate; and the molar ratio of-OH in the component A to-NCO in the component B is 1: (1.1-1.3). The coating provided by the invention does not need to be diluted during coating, the large-scale and batch coating requirements of a complex structure can be met, and a formed thin coating has relatively good anti-icing, anti-corrosion and high-temperature-resistant properties.

Description

Technical Field

[0001] This invention relates to the field of coatings and coating technology, and more specifically, to a spray / dipping dual-purpose thin-film high-temperature resistant anti-icing and anti-corrosion coating, its preparation method, and its application. Background Technology

[0002] Functional fusion coating technology breaks through the limitations of traditional coatings with a single function, organically integrating multiple functions into one, overcoming the performance bottleneck of single functions when facing complex service environments, and meeting the usage requirements of coupled application scenarios.

[0003] Anti-icing coatings are special functional protective materials, typically applied by air spraying to surfaces prone to icing, thus inhibiting ice formation. Anti-corrosion coatings are a common type of functional coating that effectively prevents corrosive media from penetrating and causing corrosion to the substrate. Certain components in these coatings can also react chemically with the protected substrate to form a passivation film, further protecting it. Combining anti-icing and anti-corrosion functions represents a significant and urgent market demand for cross-functional technologies.

[0004] In some special applications, coatings need to have dual functions of anti-icing and anti-corrosion. For example, components such as cold-end blades of helicopter engines require both internal and external coating. To adapt to the coating requirements of complex internal and external structures, a thinner needs to be added during coating to adjust the viscosity. To achieve a suitable viscosity, extensive testing is required, which not only consumes a lot of time but also increases the risk of reduced film-forming properties of the coating after adding the thinner, affecting the protective effect. In addition, to achieve anti-icing efficiency, there is high-speed hot air flowing inside the blades, and ordinary coatings are easily degraded when heated, gradually losing their protective function.

[0005] From the perspective of coating material selection, polyurethane coatings have advantages such as erosion resistance, high adhesion, and good toughness. However, under long-term conditions of 150℃, the coating is prone to degradation and peeling under high-speed, high-temperature airflow erosion, clogging the flow channels, reducing the reliability of the anti-icing system, and causing safety hazards. Silicone coatings typically use silicone rubber and silicone resin as their resin base. These materials have good high-temperature resistance, but silicone rubber has low strength, and silicone resin has unsatisfactory flexibility, neither of which can meet the requirements for erosion resistance and complex structure coating of the inner and outer walls of cold-end blades. For applications with harsh conditions, complex component structures, and large batch sizes, coatings are required to be suitable for both spraying and dipping processes to reduce process steps and difficulty, meeting the needs of large-scale applications of critical components. Simultaneously, the coating must achieve corrosion protection, anti-icing, and high-temperature resistance even with a thin layer.

[0006] Currently, most anti-icing coatings on the market are water-based or polyurethane coatings, which can only be applied by spraying. If dip coating is used, a thinner needs to be added to dilute the coating. However, due to the limitations of resin selection and formulation, it is difficult to meet the requirements of dip coating, resulting in substandard coating surface quality and defects such as missed coating. Furthermore, it cannot meet the requirements of high temperature, anti-icing, and anti-corrosion. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a dual-purpose spray / dip coating thin-film high-temperature resistant anti-icing and anti-corrosion coating and its preparation method. This coating does not require dilution during application, can meet the coating requirements of complex structures, large-scale, and batch production, and the resulting thin coating layer has good anti-icing, anti-corrosion, and high-temperature resistance properties.

[0008] Firstly, one of the objectives of this invention is to provide a thin-film high-temperature resistant, anti-icing, and anti-corrosion coating suitable for both spraying and dipping.

[0009] Specifically, the coating is formulated from components including component A and component B. Component A is formulated from raw materials including silicone-modified polyurethane resin, fluorocarbon resin, hydrophobic high-hardness filler, lubricating filler, leveling agent, and organic solvent. Component B is composed of raw materials including isocyanate. The molar ratio of -OH in component A to -NCO in component B is 1:(1.1-1.3), preferably 1:(1.1-1.2).

[0010] It is worth mentioning that the -OH groups in component A originate from the silicone-modified polyurethane resin and the fluorocarbon resin. The silicone-modified polyurethane resin contains 0.80–0.84 mol / kg of -OH and has a molecular weight of 70,000–100,000; the fluorocarbon resin contains 0.9–1.1 mol / kg of -OH and has a molecular weight of 15,000–25,000. The silicone-modified polyurethane resin is an interpenetrating polymer network formed by the polymerization reaction of silicone and polyurethane prepolymer. It possesses excellent mechanical properties and heat resistance. Together with the fluorocarbon resin, it forms a film-forming agent, ensuring the coating can operate for extended periods at temperatures of 100–120°C. The strong CF bonds in the fluorocarbon resin enhance intermolecular interactions, improving the resin's mechanical properties. Simultaneously, the silicone-modified polyurethane in this invention exhibits elasticity. The mixture of the two materials results in high strength and high toughness, which helps improve resistance to high-speed particles or air erosion, and prevents erosion and peeling even in thin-layer applications.

[0011] The silicone-modified polyurethane resin and fluorocarbon resin used in this invention are all commercially available products, such as the silicone-modified polyurethane resin IPN-G-A17 (molecular weight 80000±500) provided by Ocean Chemical Research Institute Co., Ltd., the fluorocarbon resin GK570 provided by Daikin Industries, Ltd., the fluorocarbon resin DS304 provided by Dongyue Fluorosilicon Technology Group Co., Ltd., and the fluorocarbon resin ETERFLON 41508 provided by Changxing Chemical Industry (China) Co., Ltd.

[0012] Furthermore, in component A, based on 100 parts by weight of the silicone-modified polyurethane resin, the weight parts of the other components are as follows:

[0013]

[0014] Furthermore, the hydrophobic high-hardness filler is a powder selected from a composition of nanodiamonds, alumina, and silicon carbide coated with hydrophobic materials. The mass ratio of nanodiamonds, alumina, and silicon carbide is (4-7):

[0015] (1-1.5):1; preferably (4-6):(1-1.2):1. Preferably, the particle size of the nanodiamond particles is 75-85 nm; the particle size of the alumina particles is 200-400 nm; and the particle size of the silicon carbide particles is 400-700 nm.

[0016] It is worth mentioning that the high-hardness filler used in this invention is uniformly distributed in the coating, which can resist high-speed erosion by particles or air. When high-speed particles or airflow erodes the surface, the high-hardness filler uniformly dispersed in the coating fundamentally changes the failure mode of the coating under particle impact and airflow erosion (such as changing from matrix-dominated brittle fracture to filler-dominated abrasion damage) through multiple mechanisms such as "hard point support," "stress dispersion," and "interface enhancement," thereby significantly improving its erosion resistance. At the same time, by controlling the ratio of small-diameter powder to large-diameter powder, the thickness of the coating can be controlled, achieving protective function under thin layers.

[0017] Specifically, the preparation method of hydrophobic high-hardness filler includes the following steps:

[0018] After heat treatment of a polyisocyanate solution containing perfluoroalkyl segments, a dispersant is added dropwise, and a composition of nanodiamond, alumina, and silicon carbide is added in batches under stirring. After heat treatment, a hydrophobic high-hardness filler is obtained.

[0019] More specifically, the preparation method of the hydrophobic high-hardness filler includes the following steps:

[0020] A polyisocyanate solution containing perfluoroalkyl segments is heated to 40–45°C and kept at this temperature under nitrogen for 10–15 min. A dispersant of 5–15‰ is added dropwise. A composition of nanodiamond, alumina, and silicon carbide is added in batches under stirring. The temperature is then raised to 60–65°C and kept under nitrogen for 4–6 h. After cooling to room temperature and filtration, the material is dried in an oven at 80–85°C for 45–48 h to obtain a hydrophobic high-hardness filler.

[0021] Preferably, the polyisocyanate solution containing perfluoroalkyl segments has a mass percentage of 25-35%, and the solvent is selected from one or a combination of aromatic solvents, ester solvents, and ether ester solvents, more preferably from one or a combination of xylene, aromatic hydrocarbons, butyl acetate, ethyl acetate, ethylene glycol ethyl ether acetate, and propylene glycol methyl ether acetate. The dispersant used is a conventional dispersant in the art, such as dispersant BYK163. The hydrophobic material of this invention is selected from polyisocyanates containing perfluoroalkyl segments, which are prepared using the method disclosed in Chinese Patent CN101143840A.

[0022] It is worth mentioning that the surface of the nano-diamond, alumina and silicon carbide composition coated with polyisocyanate containing perfluoroalkyl segments is hydrophobic, which can help improve the aging resistance and anti-icing effect of the coating.

[0023] Furthermore, the lubricating filler is a powder selected from a composition of silicone resin microspheres and polytetrafluoroethylene (PTFE) micropowder. The mass ratio of silicone resin microspheres to PTFE micropowder is (1–1.5):1; preferably, the particle size of the silicone resin microspheres is 75–85 nm, and the particle size of the PTFE micropowder is 400–700 nm. This invention, by combining large-particle-size PTFE with small-particle-size silicone resin microspheres, with the silicone resin microspheres dispersed within the PTFE micropowder, avoids the agglomeration of the lubricating filler and better exerts its physical barrier function.

[0024] It is worth mentioning that the composite lubricating filler used in this invention helps to reduce the friction between water droplets carried by high-speed airflow and the surface, thereby reducing the wind direction of icing.

[0025] Furthermore, the leveling agent is selected from organosilicon polyether copolymers, such as one or a combination of conventional leveling agents in the art, BYK378, BYK390, and BYK388.

[0026] Furthermore, the organic solvent is selected from one or a combination of aromatic solvents, ester solvents, and ether ester solvents; preferably from one or a combination of xylene, aromatic hydrocarbons, butyl acetate, ethyl acetate, ethylene glycol ethyl ether acetate, and propylene glycol methyl ether acetate.

[0027] Furthermore, the isocyanate is selected from the trimer of aliphatic isocyanates. In this invention, one of N3390 and N3375 provided by Bayer is selected.

[0028] Secondly, another objective of this invention is to provide a method for preparing a spray / dipping dual-purpose thin-layer high-temperature resistant anti-icing and anti-corrosion coating, which is one of the objectives of this invention.

[0029] Specifically, the method includes the following steps:

[0030] The raw material components, including silicone-modified polyurethane resin, fluorocarbon resin, hydrophobic high-hardness filler, lubricating filler, leveling agent, and organic solvent, are mixed to form component A; the components including component A and component B are mixed to obtain a thin-layer high-temperature resistant, anti-icing, and anti-corrosion coating suitable for both spraying and dipping.

[0031] More specifically, the method includes the following steps:

[0032] Organosilicon-modified polyurethane resin, fluorocarbon resin, hydrophobic high-hardness filler, lubricating filler, and organic solvent are mixed and then ground in a basket mill until the fineness is ≤5μm. After discharge, leveling agent is added and the mixture is stirred and dispersed at 1500-2000 rpm for 30-40 minutes. The mixture is then filtered through a 120-mesh filter, and the viscosity of component A (Ford Cup 4) is tested to be 10-25s. Component A and component B are taken according to a molar ratio of -OH:-NCO of 1:(1.1-1.3), mixed evenly, and allowed to stand for 20 minutes to obtain a thin-layer high-temperature resistant, anti-icing, and anti-corrosion coating suitable for both spraying and dipping.

[0033] Finally, a third objective of this invention is to provide the application of the spray / dip coating dual-purpose thin-film high-temperature resistant anti-icing and anti-corrosion coating, which is one of the objectives of this invention.

[0034] Specifically, one of the objectives of this invention is to provide a spray / dip coating for use as a thin-film high-temperature resistant, anti-icing, and anti-corrosion coating, which is applied to the surface of a substrate to form a coating. The coating has good high-temperature resistance, anti-icing, and anti-corrosion properties, and can be used for coating requirements of complex structural components, such as components that require coating both internally and externally, such as cold-end blades of helicopter engines.

[0035] Preferably, the coating can be applied to the substrate surface by spraying and / or dipping; the thickness of the dry film after coating is 5 to 10 μm, preferably 5 to 8 μm.

[0036] Preferably, the coating can be cured at room temperature (e.g., 20±2℃) for 4 to 6 hours.

[0037] Compared with existing technologies, the beneficial effects of this invention are as follows:

[0038] 1. The coating provided by this invention is a coating that does not require viscosity adjustment (no diluent needs to be added) and can be directly applied by spraying and / or dip coating processes. It is highly operable, simple in process, convenient in construction and maintenance, and can meet the requirements of anti-particle erosion, high temperature resistance, anti-icing and anti-corrosion in complex use scenarios.

[0039] 2. The coating provided by this invention uses silicone-modified polyurethane resin and fluorocarbon resin as film-forming materials, achieving anti-corrosion and anti-icing functions under thin-layer conditions. This overcomes the limitations of conventional resins in meeting film-forming and barrier properties under thin-layer and high-temperature conditions. The coating provided by this invention can cure at room temperature without dilution or other operations, and can be directly sprayed and / or dip-coated, meeting the coating requirements of complex internal and external structures of components and satisfying protection standards under harsh working conditions.

[0040] 3. The organosilicon-modified polyurethane used in this invention has an interpenetrating network structure. When used in combination with fluorocarbon resin, it has good wettability and coating properties for high-hardness fillers. At a specific viscosity, it achieves uniform dispersion of high-hardness fillers and avoids sedimentation of high-density hardness fillers. Even in dip coating process, it can achieve uniform thin-layer coating, providing a coating system that is compatible with both spraying and dip coating with strong operability.

[0041] 4. The coating provided by this invention provides good lubrication function through the mixture of silicone resin microspheres and polytetrafluoroethylene. With the synergistic effect of hydrophobic high hardness filler, it achieves the friction reduction effect of low-thickness thin-layer coating, reduces the risk of high-speed cold water droplets sticking to the coating, and plays a good protective role; it is particularly suitable for applications under coupling conditions in marine environments. Detailed Implementation

[0042] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the content of the present invention are still within the scope of protection of the present invention.

[0043] In the following examples and comparative examples, the raw materials were all commercially available products, and the information on the raw materials used is shown in Table 1:

[0044]

[0045] Example 1

[0046] The following describes the preparation of hydrophobic high-hardness fillers, with specific steps as follows:

[0047] S1. Add the polyisocyanate containing perfluoroalkyl segments to xylene (25% by mass), heat to 42°C, and hold under nitrogen for 15 minutes.

[0048] S2. Add 10‰ of dispersant BYK163 dispersant;

[0049] S3. Under stirring, nano-diamond, alumina, and silicon carbide (mass ratio 4:1:1) are added in batches. The temperature is raised to 65°C, nitrogen is applied and kept at that temperature for 4 hours, then the temperature is lowered to room temperature and filtered to obtain hydrophobic high-hardness filler. The filler is then dried in an oven at 80°C for 45 hours for later use.

[0050] The following describes the preparation of high-temperature resistant, anti-icing, and anti-corrosion coatings, using the following raw materials and their weight proportions:

[0051]

[0052] The specific steps are as follows:

[0053] The above-mentioned organosilicon-modified polyurethane resin, fluorocarbon resin, hydrophobic high-hardness filler, silicone resin microspheres, polytetrafluoroethylene micropowder, and butyl acetate were mixed and then added to a basket mill for grinding. The grinding fineness was ≤5μm. After discharging, a leveling agent was added, and the mixture was stirred and dispersed at 2000 rpm for 30 minutes. The mixture was then filtered through a 120-mesh filter to obtain component A. The viscosity of component A (Ford cup 4) was tested and found to be 18s to 22s.

[0054] According to the molar ratio -OH:-NCO=1:1.1, component A and 28 parts by weight of N3390 were mixed evenly, allowed to stand for 20 minutes, and then applied to the surface of beryllium bronze substrate by dip coating. The coating thickness of the dry film was controlled to be 6±1μm. After drying, the performance was tested.

[0055] Example 2

[0056] The following describes the preparation of high-temperature resistant, anti-icing, and anti-corrosion coatings, using the following raw materials and their weight proportions:

[0057]

[0058]

[0059] The specific steps are as follows:

[0060] The above-mentioned organosilicon-modified polyurethane resin, fluorocarbon resin, hydrophobic high-hardness filler (preparation method is the same as in Example 1, wherein the ratio of nanodiamond, alumina, and silicon carbide is 7:1:1), silicone resin microspheres, polytetrafluoroethylene micro powder, and butyl acetate were mixed and then added to a basket mill for grinding. The grinding fineness was ≤5μm. After discharging, a leveling agent was added, and the mixture was stirred and dispersed at 2000 rpm for 30 minutes. The mixture was then filtered through a 120-mesh filter to obtain component A. The viscosity of component A (Ford Cup 4) was tested and found to be 16s to 18s.

[0061] According to the molar ratio -OH:-NCO=1:1.2, component A and 33 parts by weight of N3390 were mixed evenly, allowed to stand for 20 minutes, and then applied to the surface of beryllium bronze substrate by dip coating. The coating thickness of the dry film was controlled to be 7±1μm. After drying, the performance was tested.

[0062] Example 3

[0063] The following describes the preparation of high-temperature resistant, anti-icing, and anti-corrosion coatings, using the following raw materials and their weight proportions:

[0064]

[0065] The specific steps are as follows:

[0066] The above-mentioned organosilicon-modified polyurethane resin, fluorocarbon resin, hydrophobic high-hardness filler (preparation method is the same as in Example 1, wherein the ratio of nanodiamond, alumina, and silicon carbide is 6:1:1), silicone resin microspheres, polytetrafluoroethylene micro powder, and butyl acetate were mixed and then added to a basket mill for grinding. The grinding fineness was ≤5μm. After discharge, a leveling agent was added, and the mixture was stirred and dispersed at 2000 rpm for 30 minutes. The mixture was then filtered through a 120-mesh filter to obtain component A. The viscosity of component A (Ford Cup 4) was tested and found to be 15s to 17s.

[0067] According to the molar ratio -OH:-NCO=1:1.1, component A and 30 parts by weight of N3390 were mixed evenly, allowed to stand for 20 minutes, and then applied to the surface of beryllium bronze substrate by dip coating. The coating thickness of the dry film was controlled to be 8±1μm. After drying, the performance was tested.

[0068] Comparative Example 1

[0069] The following describes the preparation of high-temperature resistant, anti-icing, and anti-corrosion coatings, using the following raw materials and their weight proportions:

[0070]

[0071] The specific steps are as follows:

[0072] The above-mentioned organosilicon-modified polyurethane resin, fluorocarbon resin, hydrophobic high-hardness filler (same as in Example 2), silicone resin microspheres, polytetrafluoroethylene micro powder, and butyl acetate were mixed and then added to a basket mill for grinding. The grinding fineness was ≤5μm. After discharging, a leveling agent was added, and the mixture was stirred and dispersed at 2000 rpm for 30 minutes. The mixture was then filtered through a 120-mesh filter to obtain component A. The viscosity of component A (Ford cup 4) was tested and found to be 14s to 16s.

[0073] According to the molar ratio -OH:-NCO=1:1.1, component A and 30 parts by weight of N3390 were mixed evenly, allowed to stand for 20 minutes, and then applied to the surface of beryllium bronze substrate by dip coating. The coating thickness of the dry film was controlled to be 8±2μm. After drying, the performance was tested.

[0074] Comparative Example 2

[0075] The following describes the preparation of high-temperature resistant, anti-icing, and anti-corrosion coatings, using the following raw materials and their weight proportions:

[0076]

[0077] The specific steps are as follows:

[0078] The above-mentioned organosilicon-modified polyurethane resin, fluorocarbon resin, hydrophobic high-hardness filler (same as in Example 2), silicone resin microspheres, polytetrafluoroethylene micro powder, and butyl acetate were mixed and then added to a basket mill for grinding. The grinding fineness was ≤5μm. After discharging, a leveling agent was added, and the mixture was stirred and dispersed at 2000 rpm for 30 minutes. The mixture was then filtered through a 120-mesh filter to obtain component A. The viscosity of component A (Ford Cup 4) was tested and found to be 18s to 20s.

[0079] According to the molar ratio -OH:-NCO=1:1.1, component A and 32 parts by weight of N3390 were mixed evenly, allowed to stand for 20 minutes, and then applied to the surface of beryllium bronze substrate by dip coating. The coating thickness of the dry film was controlled to be 7±2μm. After drying, the performance was tested.

[0080] Comparative Example 3

[0081] The following describes the preparation of high-temperature resistant, anti-icing, and anti-corrosion coatings, using the following raw materials and their weight proportions:

[0082]

[0083]

[0084] The specific steps are as follows:

[0085] The above-mentioned organosilicon-modified polyurethane resin, fluorocarbon resin, hydrophobic high-hardness filler (same as in Example 2), silicone resin microspheres, polytetrafluoroethylene micro powder, and butyl acetate were mixed and then added to a basket mill for grinding. The grinding fineness was ≤5μm. After discharging, a leveling agent was added, and the mixture was stirred and dispersed at 2000 rpm for 30 minutes. The mixture was then filtered through a 120-mesh filter to obtain component A. The viscosity of component A (Ford Cup 4) was tested and found to be 18s to 20s.

[0086] According to the molar ratio -OH:-NCO=1:1.1, component A and 30 parts by weight of N3390 were mixed evenly, allowed to stand for 20 minutes, and then applied to the surface of beryllium bronze substrate by dip coating. The coating thickness of the dry film was controlled to be 8±2μm. After drying, the performance was tested.

[0087] Comparative Example 4

[0088] This comparative example illustrates the preparation of a high-temperature resistant, anti-icing, and anti-corrosion coating. The raw materials and preparation methods used are the same as in Example 2, except that the ratio of nanodiamond, alumina, and silicon carbide is 1:2:3.

[0089] The coatings prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to performance tests, and the tests were conducted according to the following standards:

[0090] Process performance: Coating thickness, GB / T 13452.2-2008, 7±3μm;

[0091] Temperature resistance: thermal shock resistance, GJB150.5A-2009, -55℃~150℃, 10 cycles;

[0092] Anti-particle erosion performance: Abrasion resistance test (1000g / 1000r), GB / T 1768-2006, ≤8mg;

[0093] Anti-icing performance: In an ice wind tunnel test, the coating did not freeze or peel off after 20 minutes;

[0094] Corrosion resistance: Acidic atmosphere test, GJB150.28-2009, no obvious corrosion was observed on the surface and inside of the component.

[0095] Specific test data are shown in Table 2.

[0096]

[0097] As shown in Table 2, the coating thickness obtained in Examples 1-3 using the dip coating process is <10 micrometers and meets the index requirements, exhibiting good high temperature resistance, anti-icing, and anti-corrosion effects.

[0098] Furthermore, a comparison between Example 2 and Comparative Example 1 shows that when the amount of silicone-modified polyurethane resin used in Comparative Example 1 is relatively large, although the viscosity of the coating system can be reduced by increasing the amount of diluent, the uniformity of resin dispersion in the coating system is poor compared to that in Example 2, resulting in greater difficulty in controlling the coating thickness. Under the same process conditions, the uniformity of coating thickness after dip coating is poor and does not meet the requirements. Due to the imbalance of the ratio, the wear of the coating also increases.

[0099] Furthermore, a comparison between Example 2 and Comparative Example 2 shows that when the amount of silicone-modified polyurethane resin used in Comparative Example 2 is small, the heat resistance decreases. After temperature shock cycles, the coating exhibits discoloration, blistering, increased wear, easy icing on the surface, and corrosion.

[0100] Furthermore, a comparison between Example 2 and Comparative Example 3 shows that in Comparative Example 3, when the amount of hydrophobic high-hardness filler is relatively small, the wear resistance of the coating decreases significantly. After being impacted by high-speed water droplets, its surface becomes rough and obvious ice particles adhere.

[0101] Furthermore, a comparison between Example 2 and Comparative Example 4 reveals that in Comparative Example 4, when the proportion of large particles in the hydrophobic high-hardness filler is relatively high, interfacial defects will form between the filler and the resin matrix. This leads to a decrease in coating strength and wear resistance, and a reduction in its anti-permeability and anti-corrosion performance. Its surface is easily damaged under high-speed water / ice particle impact, exhibiting significant icing; simultaneously, corrosive media penetrate more easily, causing significant corrosion.

[0102] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A spray / immersion dual-purpose thin-layer high-temperature-resistant anti-icing anticorrosive coating prepared from components including a component A and a component B, the component A being prepared from raw material components including a silicone-modified polyurethane resin, a fluorocarbon resin, a hydrophobic high-hardness filler, a lubricating filler, a leveling agent, and an organic solvent; the component B being prepared from raw material components including an isocyanate; a molar ratio of -OH in the component A to -NCO in the component B being 1:(1.1-1.3). The molar ratio of -OH in the component A to -NCO in the component B is 1:(1.1-1.2). The -OH content in the silicone-modified polyurethane resin is 0.80-0.84 mol / kg. The molecular weight of the silicone-modified polyurethane resin is 70-100 thousand.

2. The thin-layer high-temperature-resistant anti-icing and anti-corrosion paint for spray / immersion coating according to claim 1, characterized in that, The -OH content in the fluorocarbon resin is 0.9-1.1 mol / kg. The molecular weight of the fluorocarbon resin is 1.5-2.5 thousand. In the component A, the weight of each component other than the silicone-modified polyurethane resin is 100 parts by weight.

4. The spray / immersion dual-purpose thin-layer high-temperature-resistant anti-icing anticorrosive coating according to claim 3, wherein the hydrophobic high-hardness filler is selected from a combination of nano-diamonds, alumina, and silicon carbide coated with a hydrophobic material. The mass ratio of the nano-diamonds, alumina, and silicon carbide is preferably (4-7):(1-1.5):1, and more preferably (4-6):(1-1.2):

1. The particle size of the nano-diamonds is preferably 75-85 nm. The particle size of the alumina is preferably 200-400 nm. The particle size of the silicon carbide is preferably 400-700 nm. The preparation method of the hydrophobic high-hardness filler comprises the following steps:

3. The thin-layer high-temperature-resistant anti-icing and anti-corrosion paint for spray / immersion coating according to claim 1, characterized in that, After the solution of the polyisocyanate containing a perfluoroalkyl chain segment is subjected to heat preservation, a dispersant is added dropwise, and a combination of nano-diamonds, alumina, and silicon carbide is added in batches under stirring, and the hydrophobic high-hardness filler is obtained after heat preservation. The mass percentage of the solution of the polyisocyanate containing a perfluoroalkyl chain segment is preferably 25-35%. The solvent is preferably selected from one or a combination of aromatic solvents, ester solvents, and ether ester solvents, and more preferably one or a combination of xylene, aromatic hydrocarbon compounds, butyl acetate, ethyl acetate, ethylene glycol ethyl ether acetate, and propylene glycol methyl ether acetate. The lubricating filler is selected from a combination of silicone resin microspheres and polytetrafluoroethylene micro powder, and the mass ratio of the silicone resin microspheres to the polytetrafluoroethylene micro powder is (1-1.5):

1. The particle size of the silicone resin microspheres is preferably 75-85 nm. The particle size of the polytetrafluoroethylene micro powder is preferably 400-700 nm.

7. The spray / immersion dual-purpose thin-layer high-temperature-resistant anti-icing anticorrosive coating according to claim 1, wherein the leveling agent is selected from a silicone polyether copolymer. The organic solvent is preferably selected from one or a combination of aromatic solvents, ester solvents, and ether ester solvents. ​ 5. The thin-layer high-temperature-resistant anti-icing and anti-corrosion paint for spray / immersion coating according to claim 4, characterized in that, ​ ​ ​ ​ 6. The thin-layer high-temperature-resistant anti-icing and anti-corrosion paint for spray / immersion coating according to claim 1, characterized in that, ​ ​ ​ ​ ​ ​ ​ Preferably, the organic solvent is selected from one or a combination of xylene, aromatic hydrocarbon, butyl acetate, ethyl acetate, ethylene glycol ethyl ether acetate, propylene glycol methyl ether acetate.

8. The thin-layer high-temperature-resistant anti-icing and anti-corrosion paint for spray / dip coating according to claim 1, characterized in that, The isocyanate is selected from a trimer of aliphatic isocyanate; preferably from one of N3390, N3375.

9. The method for preparing the spray / immersion dual-purpose thin-layer high-temperature-resistant anti-icing anticorrosive coating according to any one of claims 1-8, comprising the following steps: Mixing and preparing the raw material components including the silicone-modified polyurethane resin, the fluorocarbon resin, the hydrophobic high-hardness filler, the lubricating filler, the leveling agent, and the organic solvent into the A component; mixing the components including the A component and the B component to obtain the coating.

10. The application of the spray / immersion dual-purpose thin-layer high-temperature-resistant anti-icing anticorrosive coating according to any one of claims 1-8, wherein the coating is coated on the surface of a substrate to form a coating layer. Preferably, the coating can be coated on the surface of a substrate in the manner of spraying and / or immersion; Preferably, the total thickness of the coating layer is 5-10 μm, preferably 5-8 μm; preferably, the coating layer is cured at room temperature, and the curing time is 4-6 h.

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