A coating and a coated article

Abstract

The application provides a coating, which comprises a component A and a component B; the component A comprises an epoxy resin composition, surface-modified aluminum powder, an anti-settling agent, a dispersing agent, a leveling agent and a first solvent; the component B comprises a rubber-modified curing agent, an accelerator and a second solvent; the surface-modified aluminum powder is silica-coated aluminum powder. The coating has excellent heat resistance, rain erosion resistance, fluid medium resistance and high and low temperature resistance, and can maintain good coating integrity under complex environments such as high temperature, high-speed airflow and raindrop impact, effectively reducing the risk of coating cracking, damage and peeling.

Description

Technical Field

[0001] This application relates to the field of functional coatings technology, specifically to a coating and a coating layer. Background Technology

[0002] During high-speed flight, aircraft frontal structural surfaces are constantly exposed to complex environments such as high-speed airflow, raindrop impact, sand and dust erosion, and salt spray. The high-frequency, high-speed, and high-intensity impacts can easily cause damage to material surfaces, such as pitting, cracking, and coating peeling, thus affecting structural integrity and service life. This is especially true for high-temperature service structures such as engine lip anti-icing components, whose surfaces not only need to withstand high-speed raindrop impacts but also endure long-term thermal environments, placing higher demands on the heat resistance, impact resistance, and environmental stability of protective coatings.

[0003] While existing elastic polyurethane protective coatings possess good flexibility and impact resistance, their mechanical properties tend to deteriorate under heat, making them ineffective against high-speed airflow and rain erosion, and prone to cracking, breakage, and peeling. Traditional heat-resistant protective coatings, on the other hand, suffer from insufficient toughness and limited impact resistance. Therefore, there is an urgent need to develop a coating with comprehensive properties including resistance to high and low temperatures, impact resistance, rain erosion resistance, and corrosion resistance to meet the long-term stable protection requirements of high-temperature structural components on the windward surfaces of aircraft. Summary of the Invention

[0004] In view of this, the technical problem to be solved by this application is to provide a coating and a coating layer, wherein the coating provided by this application has excellent resistance to rain erosion, corrosion, high and low temperature and fluid media.

[0005] This application provides a coating comprising component A and component B; The first component comprises an epoxy resin composition, surface-modified aluminum powder, an anti-settling agent, a dispersant, a leveling agent, and a first solvent; The second component includes a rubber-modified curing agent, an accelerator, and a second solvent; The surface-modified aluminum powder is aluminum powder coated with silicon dioxide.

[0006] In some specific implementations, component A, by mass percentage, comprises: 15%~20% epoxy resin composition; 50%~70% surface-modified aluminum powder; 0.5%~1.5% anti-settling agent; 1%~3% dispersant; 0.2%~1% leveling agent; 15%~25% of the first solvent.

[0007] In some specific implementations, component B, by mass percentage, comprises: 50%~65% rubber modifier and curing agent; 1%~5% accelerator; 30%~50% secondary solvent.

[0008] In some specific implementations, the epoxy resin composition includes bisphenol A type epoxy resin and toughened epoxy resin.

[0009] In some specific implementations, the bisphenol A type epoxy resin is selected from one or more of E51 epoxy resin and E20 epoxy resin; The toughening epoxy resin is a carboxyl-terminated liquid butadiene nitrile rubber modified epoxy resin.

[0010] In some specific implementations, the rubber-modifying curing agent includes amino-terminated liquid nitrile rubber and polyetheramine curing agent.

[0011] In some specific implementations, the polyetheramine curing agent is selected from one or more of polyetheramine T-403, polyetheramine D-250, polyetheramine D-400, and polyetheramine D-2000.

[0012] In some specific implementations, the mass ratio of component A to component B is 100:10~30.

[0013] In some specific implementations, the promoter is one or more of 2,4,6-tris(dimethylaminomethyl)phenol, benzyldimethylamine, and dimethylphenylamine.

[0014] This application also provides a coating formed by curing the above-described coating material.

[0015] This application provides a coating comprising component A and component B. Component A includes an epoxy resin composition, surface-modified aluminum powder, an anti-settling agent, a dispersant, a leveling agent, and a first solvent. Component B includes a rubber-modified curing agent, an accelerator, and a second solvent. The surface-modified aluminum powder is silica-coated aluminum powder. The coating of this application exhibits excellent heat resistance, rain erosion resistance, fluid media resistance, and high and low temperature resistance. It can maintain good coating integrity under complex environments such as high temperature, high-speed airflow, and raindrop impact, effectively reducing the risk of coating cracking, damage, and peeling. Simultaneously, the cured coating has good salt spray and corrosion resistance, effectively blocking corrosive media from eroding the substrate and improving the long-term service reliability of structural components. Furthermore, the coating of this application adopts a two-component system, can be applied using conventional spraying methods, and can be cured at room temperature or by heating, featuring convenient application and strong applicability. Moreover, the coating has good adhesion to the metal substrate, which is beneficial to improving the stability of the coating during service. The coatings described in this application are particularly suitable for surface protection of the windward surfaces and heat-exposed structural components of aircraft, and can meet the requirements for rain erosion protection under high-temperature service conditions. Detailed Implementation

[0016] Those skilled in the art can refer to the content of this document and appropriately improve the process parameters to achieve the desired results. The methods and applications of this application have been described through preferred embodiments. It is evident that those skilled in the art can modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit, and scope of this application to implement and apply the technology of this application.

[0017] It should be understood that the expression “one or more of…” individually includes each of the objects described after the expression, as well as various different combinations of two or more of the described objects, unless otherwise understood from the context and usage. The expression “and / or” combined with three or more described objects should be understood to have the same meaning, unless otherwise understood from the context.

[0018] The terms “including,” “having,” or “containing,” including the use of their grammatical synonyms, should generally be understood as open-ended and non-restrictive, for example, not excluding other unstated elements or steps, unless otherwise specifically stated or understood from the context.

[0019] It should be understood that the order of steps or the sequence of actions is not important as long as this application remains operational. Furthermore, two or more steps or actions can be performed simultaneously.

[0020] The use of any and all instances or exemplary language such as “e.g.” or “including” herein is merely intended to better illustrate the application and does not constitute a limitation on the scope of the application unless the claims are made. No language in this specification should be construed as indicating that any unclaimed element is essential to the practice of this application.

[0021] Furthermore, the numerical ranges and parameters used to define this application are approximate values, and the relevant values ​​in the specific embodiments have been presented as precisely as possible. However, any numerical value inevitably contains standard deviations due to individual test methods. Therefore, unless otherwise explicitly stated, it should be understood that all ranges, quantities, values, and percentages used in this disclosure are modified with the word "approximately." Here, "approximately" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a specific value or range.

[0022] This application provides a coating comprising component A and component B; The first component comprises an epoxy resin composition, surface-modified aluminum powder, an anti-settling agent, a dispersant, a leveling agent, and a first solvent; The second component includes a rubber-modified curing agent, an accelerator, and a second solvent; The surface-modified aluminum powder is aluminum powder coated with silicon dioxide.

[0023] In the coating, the total mass of all components is 100% by mass percentage, and component A includes: 15%~20% epoxy resin composition; 50%~70% surface-modified aluminum powder; 0.5%~1.5% anti-settling agent; 1%~3% dispersant; 0.2%~1% leveling agent; 15%~25% of the first solvent.

[0024] Preferably, the total mass of all components is 100% by mass percentage, and component A comprises: 16%~20% epoxy resin composition; 55%~64% surface-modified aluminum powder; 0.5%~1.5% anti-settling agent; 1%~2% dispersant; 0.2%~0.5% leveling agent; 16%~23% of the first solvent.

[0025] In the coating, the total mass of all components is 100% by mass percentage, and component B includes: 50%~65% rubber modifier and curing agent; 1%~5% accelerator; 30%~50% secondary solvent.

[0026] Preferably, the total mass of all components is 100% by mass percentage, and component B comprises: 50%~65% rubber modifier and curing agent; 3%~5% accelerator; 36%~50% Secondary solvent.

[0027] The epoxy resin composition described in this application is used to provide the basic mechanical properties, heat resistance properties, and adhesion properties to the substrate of the coating. The epoxy resin composition preferably includes a bisphenol A type epoxy resin and a toughening epoxy resin. In some specific implementations, the bisphenol A type epoxy resin can preferably be one or more of E51 epoxy resin and E20 epoxy resin, more preferably E51 epoxy resin and E20 epoxy resin. E51 epoxy resin has a small molecular weight and acts as a highly crosslinked component in the system; E20 epoxy resin has a larger molecular weight and is solid at room temperature, playing two main roles in the resin system: firstly, increasing the segment length between crosslinking points and improving coating toughness; secondly, under room temperature curing conditions, the coating exhibits excellent surface drying performance and a short surface drying time after spraying, providing good processability.

[0028] The toughening epoxy resin is preferably a carboxyl-terminated liquid nitrile rubber modified epoxy resin. The epoxy equivalent of the toughening epoxy resin is preferably 320 g / eq to 380 g / eq. The toughening epoxy resin introduces a rubber segment structure into the system. After curing, it forms phase-separated rubber particles with an "island structure," achieving a toughening effect by absorbing and buffering external force energy. However, the toughening component also reduces the heat resistance of the epoxy resin system to some extent. Therefore, a suitable ratio is needed to maximize the coating toughness while ensuring heat resistance. Furthermore, the toughening epoxy resin possesses both strongly polar epoxy functional groups and an island-phase rubber component, which can significantly improve the compatibility between bisphenol A type epoxy resin and medium molecular weight rubber-modified curing agent. It can act as a compatibility bridge in the system, achieving a synergistic effect between various epoxy resin components.

[0029] Preferably, the epoxy resin composition described in this application is composed of E51 epoxy resin, E20 epoxy resin, and toughening epoxy resin. In some specific implementations, the mass ratio of the E51 epoxy resin, E20 epoxy resin, and toughening epoxy resin is preferably 3~6:2~4:1~2, more preferably 4~5.5:3~4:1.5~2. By employing an epoxy resin composition system with high toughness, it is beneficial to improve the coating's crack resistance under high-speed airflow, raindrop impact, and temperature change environments.

[0030] The surface-modified aluminum powder described in this application is silica-coated aluminum powder. The silica-coated aluminum powder provides a shielding and protective effect against metallic aluminum powder. Simultaneously, the silica coating improves the bonding performance between the aluminum powder and the epoxy resin matrix, enhances the dispersion stability of the aluminum powder in the coating, and protects the aluminum powder surface from discoloration caused by high-temperature oxidation. This contributes to improving the coating's resistance to media, corrosion, and long-term environmental stability.

[0031] The silica-coated aluminum powder described in this application imparts excellent high-temperature oxidation resistance to the coating, exhibits minimal color difference after high-temperature treatment, and simultaneously enhances the coating's salt spray and corrosion resistance. The silica coating improves the compatibility between the aluminum powder and the resin matrix, contributing to increased coating density. The surface-modified aluminum powder described in this application is preferably in flake form. Flake-shaped aluminum powder possesses a "maze effect," providing excellent shielding against gases and corrosive media. The particle size (D) of the surface-modified aluminum powder... 50 The particle size (D) of the surface-modified aluminum powder can be adjusted according to actual application requirements. In some specific implementations, the particle size (D) of the surface-modified aluminum powder can be adjusted. 50 The preferred size is 2μm to 25μm, more preferably 3μm to 10μm. Furthermore, the heat resistance of the composition is related to the aluminum powder filler, and the synergistic effect among the components can jointly achieve the final technical specifications of the coating.

[0032] The anti-settling agent described in this application is used to improve the stability of coatings during storage and prevent the sedimentation of solid components such as aluminum powder. In some specific implementations, the anti-settling agent is selected from BYK-410, 6410, and ADDS-2410, with BYK-410 being more preferred.

[0033] The dispersant described in this application is used to improve the dispersion effect of surface-modified aluminum powder in an epoxy resin system and enhance the uniformity of the coating structure. In some specific implementations, the dispersant is selected from Dispers 670, 5375, and PF1217, with Dispers 670 being more preferred.

[0034] The leveling agent described in this application is used to improve the leveling performance during the coating application process, resulting in a smoother coating surface. In some specific implementations, the leveling agent is selected from one of BYK-331, 3233, and 3009, with BYK-331 being more preferred.

[0035] The rubber-modified curing agent described in this application is used to react with an epoxy resin composition to form a cross-linked structure and improve the toughness of the cured coating. The rubber-modified curing agent comprises amino-terminated liquid nitrile butadiene rubber (ATBN) and a polyetheramine curing agent. Preferably, the polyetheramine curing agent is one or more of polyetheramine T-403, polyetheramine D-250, polyetheramine D-400, and polyetheramine D-2000. The amino-terminated liquid nitrile butadiene rubber is selected from ATBN 1300. 21. ATBN 1300 16 and ATBN1300 One or more of 35. The molecular weight range of the ATBN is preferably 1000~5000 Da. In some specific implementations, the mass ratio of the ATBN to the polyetheramine curing agent is preferably 1~3:1, more preferably 1~2:1. By introducing a rubber-modified curing agent, the problem of high brittleness in traditional epoxy curing systems can be improved, so that the resulting coating can maintain good integrity under high-speed impact loads and thermal cycling.

[0036] The amino-terminated liquid nitrile rubber component is the main source of toughness for the coating to achieve rain erosion resistance in this application. However, the heat resistance of the rubber component itself is weaker than that of traditional epoxy resin. The high degree of crosslinking provided by ordinary epoxy resin can provide basic support for the heat resistance of the coating. Combined with the heat resistance contribution of silica-coated aluminum powder, the multiple components work together to ensure the overall heat resistance level of the coating.

[0037] Both the toughening epoxy resin and the rubber-modified curing agent described in this application contain toughening components. The toughening epoxy resin is synthesized and modified from epoxy resin and liquid rubber, possessing both highly cross-linked epoxy functional groups and a high-toughness rubber structure. This improves the miscibility between the rubber phase and the epoxy resin matrix, thus enhancing the overall integrity of the final coating. The rubber-modified curing agent is a type of medium-molecular-weight rubber molecule, with functional groups on its molecular chain capable of reacting with epoxy groups. The toughening epoxy resin and the rubber-modified curing agent work synergistically to improve key properties of the coating, such as high-temperature resistance and raindrop impact resistance.

[0038] The accelerator described in this application is used to promote the curing reaction between the epoxy resin composition and the rubber-modified curing agent, improve the curing efficiency of the coating system, enable the coating to form a stable cured structure, and improve the mechanical properties, heat resistance, and environmental stability of the coating. In some specific implementations, the accelerator is preferably one or more of 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30), benzyldimethylamine, and dimethylphenylamine, more preferably DMP-30.

[0039] The first and second solvents in this application are used to adjust the application viscosity and flow properties of the coating system. The first and second solvents are each preferably one or more selected from xylene, cyclohexanone, butanol, and methyl ethyl ketone.

[0040] This application also provides a method for preparing the above-mentioned coating, comprising the following steps: (1) Mix the epoxy resin composition, silica-coated aluminum powder, anti-settling agent, dispersant, leveling agent and first solvent to obtain component A.

[0041] Specifically, the raw materials are first weighed according to the formula ratio of component A in the above coating; under high-speed stirring at 200rpm~1500rpm (preferably 500rpm~1000rpm), the first solvent, epoxy resin composition, surface modified aluminum powder, anti-settling agent, dispersant and leveling agent are added to the mixing tank in sequence for preliminary stirring and pre-dispersion; after preliminary stirring and pre-dispersion, the mixture is ground and dispersed 2~5 times (preferably 3 times) using a sand mill, high-speed vibrating disperser or other grinding equipment until the fineness of the coating is ≤50μm, preferably ≤40μm, and then filtered to obtain component A of the coating.

[0042] (2) Mix the rubber-modifying curing agent, accelerator and second solvent to obtain component B.

[0043] Specifically, the raw materials are weighed according to the formula ratio of component B in the above coating, and the second solvent, rubber-modified curing agent and accelerator are added to the mixing tank in sequence under the condition of high speed stirring at 200rpm~1000rpm (preferably 400rpm~800rpm) and mixed evenly. After being mixed evenly, the mixture is filled and sealed to obtain component B of the coating.

[0044] (3) Mix the components A and B to obtain a coating.

[0045] In some specific implementations, raw materials are weighed and thoroughly mixed according to a mass ratio of component A to component B of 100:10~30 to obtain the coating.

[0046] This application also provides a coating formed by curing the above-described coating material.

[0047] Specifically, this application applies the above-mentioned coating to the surface of a metal substrate using conventional methods such as spraying, and after curing, forms a coating with rain erosion resistance and heat resistance.

[0048] In this application, the curing temperature and time can be adjusted according to actual application requirements, and curing can be performed at room temperature or accelerated by heating. The curing temperature in this application is preferably 25℃~150℃, more preferably 120℃; the curing time is preferably 12h~48h, more preferably 24h.

[0049] The coating provided in this application features simple construction and strong applicability. It exhibits excellent interlayer adhesion to the metal substrate, forming a dense and stable protective coating upon curing. This coating possesses superior resistance to rain erosion, fluid media, and high and low temperatures, maintaining good coating integrity even under harsh environments such as high-speed airflow, raindrop impact, and temperature variations. It is particularly suitable for surface protection of aircraft windward structures and heat-affected components. Furthermore, the formed coating demonstrates good resistance to environmental aging and provides good protection against corrosive environments such as salt spray and humid heat. It effectively reduces the penetration of corrosive media into the substrate, improving the service life and reliability of the metal substrate under complex service environments.

[0050] The present application is further illustrated below with reference to embodiments. The scope of protection of the present application is not limited to the following embodiments.

[0051] Unless otherwise specified, all raw materials used in the embodiments of this application were purchased through commercial channels; Unless otherwise specified, room temperature or normal temperature in the embodiments of this application refers to 25±3℃.

[0052] Example 1

[0053] (1) Preparation of component A of the coating: Under the condition of high-speed stirring at 500 rpm, add 23 kg of the first solvent (xylene:butanol = 7:3), 20 kg of epoxy resin composition (E51 epoxy resin:E20 epoxy resin:toughened epoxy resin = 5:3:2), 55 kg of silica-coated aluminum powder, 0.5 kg of anti-settling agent, 1 kg of dispersant and 0.5 kg of leveling agent to the mixing tank in sequence. After preliminary stirring and pre-dispersion, grind and disperse three times with a sand mill until the fineness of the coating is less than 40 μm. After filtration, the coating component A is obtained by bottling.

[0054] (2) Preparation of component B of coating: Under the condition of high-speed stirring at 400 rpm, add 6 kg of second solvent (xylene:butanol=7:3), 13 kg of rubber modified curing agent (ATBN:T-403:D-250=50:20:30) and 1 kg of accelerator DMP-30 to the mixing tank, stir evenly, fill and seal to obtain component B of coating.

[0055] (3) Coating preparation: Mix the prepared component A and component B thoroughly to obtain the coating.

[0056] Example 2

[0057] (1) Preparation of component A: Under high-speed stirring at 600 rpm, add 22 kg of the first solvent (xylene:butanol:cyclohexanone = 6:2:2), 18 kg of epoxy resin composition (E51 epoxy resin:E20 epoxy resin:toughening epoxy resin = 4:4:2), 57 kg of silica-coated aluminum powder, 1.3 kg of anti-settling agent, 1.5 kg of dispersant and 0.2 kg of leveling agent to the mixing tank in sequence. After preliminary stirring and pre-dispersion, grind and disperse three times with a sand mill until the fineness of the coating is less than 40 μm. After filtration, bottle the coating to obtain component A.

[0058] (2) Preparation of component B: Under the condition of high-speed stirring at 500 rpm, add 7.2 kg of second solvent (xylene:butanol:cyclohexanone=6:2:2), 12 kg of rubber modified curing agent (ATBN:T-403:D-400=50:30:20) and 0.8 kg of accelerator DMP-30 to the mixing tank, stir evenly, fill and seal to obtain component B of the coating.

[0059] (3) Coating preparation: Mix the prepared component A and component B thoroughly to obtain the coating.

[0060] Example 3

[0061] (1) Preparation of component A of the coating: Under high-speed stirring at 800 rpm, add 16 kg of the first solvent (xylene:butanol:butanone = 6:3:1), 16 kg of epoxy resin composition (E51 epoxy resin:E20 epoxy resin:toughening epoxy resin = 5.5:3.5:1), 64 kg of silica-coated aluminum powder, 1.5 kg of anti-settling agent, 2 kg of dispersant and 0.5 kg of leveling agent to the mixing tank in sequence. After preliminary stirring and pre-dispersion, grind and disperse the coating three times with a sand mill until the fineness of the coating is less than 40 μm. After filtration, the coating is bottled to obtain component A of the coating.

[0062] (2) Preparation of component B of the coating: Under the condition of high-speed stirring at 400 rpm, add 9.4 kg of the second solvent (xylene:butanol:butanone = 6:3:1), 10 kg of rubber modified curing agent (ATBN:T-403:D-2000 = 60:30:20) and 0.6 kg of accelerator DMP-30 to the mixing tank, stir evenly, fill and seal to obtain component B of the coating.

[0063] (3) Coating preparation: Mix the prepared component A and component B thoroughly to obtain the coating.

[0064] Comparative Example 1

[0065] Compared with Example 1, the difference is that the silica-coated aluminum powder is replaced with ordinary spherical aluminum powder, while the other steps are the same, and the coating is obtained.

[0066] Comparative Example 2

[0067] Compared with Example 2, the difference is that only E51 and E20 epoxy resins (in a mass ratio of 1:1) are used, and only T-403 and D-400 curing agents (in a mass ratio of 3:2) are used. The other steps are the same to obtain the coating.

[0068] Comparative Example 3

[0069] Compared with Example 3, the difference is that only toughened epoxy resin is used as the epoxy resin, while the other steps are the same to obtain the coating.

[0070] Comparative Example 4

[0071] Compared with Example 3, the difference is that only T-403 and D-2000 (in a mass ratio of 3:2) are used as curing agents, while the other steps are the same to obtain the coating.

[0072] Test case

[0073] The coatings obtained in the above examples and comparative examples were uniformly applied to the surface of a metal substrate by spraying to prepare test samples, with the coating thickness controlled at 30 μm. After leveling, the coated samples were cured at 120°C for 24 h to obtain the coating samples for testing.

[0074] The prepared coating samples were subjected to performance tests according to the test standards. The test items included flexibility, impact resistance, adhesion, resistance to fluid media, low temperature resistance, heat resistance, resistance to neutral salt spray, resistance to filamentous corrosion, and resistance to rain erosion. The test results are shown in Tables 1 and 2. Table 1 shows the performance test results of the coatings prepared in Examples 1 to 3, and Table 2 shows the performance test results of the coatings prepared in Comparative Examples 1 to 4.

[0075] Table 1. Performance test results of coatings prepared in Examples 1-3

[0076] Table 2. Performance test results of coatings prepared in Comparative Examples 1-4

[0077] As shown in Table 1, the coatings prepared in Examples 1-3 all exhibited good overall performance. Specifically, the coating flexibility test showed no cracks, and the impact resistance reached 50 cm, indicating that the obtained coatings have good toughness and impact resistance, can withstand external impact loads, and reduce the risk of coating failure due to stress cracking.

[0078] Meanwhile, the coatings obtained in Examples 1-3 showed no cracks, blistering, or other film defects after being treated at 240℃ for 96 hours, indicating that the coatings have good heat resistance and can meet the requirements of use in high-temperature service environments. In addition, the coatings showed no significant changes after long-term immersion in lubricating oil, and did not blister, wrinkle, or peel off in low-temperature environments, indicating that they have good resistance to fluid media and environmental adaptability.

[0079] Furthermore, the coatings obtained in Examples 1-3 showed no blistering, wrinkling, or peeling after 3000 hours of neutral salt spray testing and 30 days of filamentous corrosion testing, indicating that the coatings have good salt spray and corrosion resistance and can effectively block the corrosive media from eroding the substrate. Rain erosion resistance test results showed that under high-speed rain erosion conditions of 616 km / h, the leading edges of the coatings in Examples 1-3 showed no peeling, indicating that the protective coating can maintain good coating integrity under high-speed airflow and raindrop impact, demonstrating excellent rain erosion protection capabilities.

[0080] As shown in Table 2, the ordinary aluminum powder without special modification in Comparative Example 1 has poor compatibility with the resin system, making it a weak link in the overall coating structure. This directly affects the coating's density, leading to a decrease in salt spray resistance. The test results of Comparative Example 2 indicate that the toughening epoxy resin and rubber-modified curing agent can provide toughness and impact resistance to the coating system. The test results of Comparative Example 3 show that while using toughening epoxy resin alone can achieve good toughness, it results in insufficient crosslinking density, reducing coating density and consequently decreasing salt spray resistance, while also exhibiting poor heat resistance. The test results of Comparative Example 4 indicate that the toughening curing agent is a crucial component in providing coating toughness.

[0081] In summary, the coating provided in this application has excellent mechanical properties, heat resistance, corrosion resistance, and rain erosion resistance, which can meet the long-term protection requirements of the windward surface and heat-affected structural components of aircraft under complex environmental conditions.

[0082] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and inventive concept of this application, should be included within the scope of protection of this application.

Claims

1. A coating, characterized in that, Includes component A and component B; The first component comprises an epoxy resin composition, surface-modified aluminum powder, an anti-settling agent, a dispersant, a leveling agent, and a first solvent; The second component includes a rubber-modified curing agent, an accelerator, and a second solvent; The surface-modified aluminum powder is aluminum powder coated with silicon dioxide.

2. The coating according to claim 1, characterized in that, By mass percentage, component A comprises: 15%~20% epoxy resin composition; 50%~70% surface-modified aluminum powder; 0.5%~1.5% anti-settling agent; 1%~3% dispersant; 0.2%~1% leveling agent; 15%~25% of the first solvent.

3. The coating according to claim 1, characterized in that, Component B, by mass percentage, comprises: 50%~65% rubber modifier and curing agent; 1%~5% accelerator; 30%~50% secondary solvent.

4. The coating according to claim 1, characterized in that, The epoxy resin composition includes bisphenol A type epoxy resin and toughened epoxy resin.

5. The coating according to claim 4, characterized in that, The bisphenol A type epoxy resin is selected from one or more of E51 epoxy resin and E20 epoxy resin; The toughening epoxy resin is a carboxyl-terminated liquid butadiene nitrile rubber modified epoxy resin.

6. The coating according to claim 1, characterized in that, The rubber-modifying curing agent includes amino-terminated liquid butadiene nitrile rubber and polyetheramine curing agent.

7. The coating according to claim 6, characterized in that, The polyetheramine curing agent is selected from one or more of polyetheramine T-403, polyetheramine D-250, polyetheramine D-400 and polyetheramine D-2000.

8. The coating according to claim 1, characterized in that, The mass ratio of component A to component B is 100:10~30.

9. The coating according to claim 1, characterized in that, The accelerator is one or more of 2,4,6-tris(dimethylaminomethyl)phenol, benzyldimethylamine, and dimethylphenylamine.

10. A coating, characterized in that, It is formed by curing the coating as described in any one of claims 1 to 9.

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