High-speed rail damping surface backboard based on anticorrosive coating and preparation method thereof

Abstract

The application relates to the field of damping surface backboards, and more particularly to a high-speed rail damping surface backboard based on an anticorrosive coating and a preparation method thereof. The high-speed rail damping surface backboard based on the anticorrosive coating comprises a metal backboard layer as a base and an anticorrosive coating on the surface of the metal backboard layer, and the raw materials of the anticorrosive coating mainly comprise epoxy resin, modified functional resin, zinc-aluminum composite particles, functional fillers, silane coupling agents, ultraviolet-resistant agents and anti-settling agents. The finally-prepared damping surface backboard not only maintains the excellent anticorrosion and weather resistance of the backboard, but also can greatly improve the waterproof and moisture resistance, moisture-resistant decomposition and other performances of the damping surface backboard, the anticorrosive coating can maintain excellent adhesion of the anticorrosive coating under the condition of long-time corrosion medium and moisture invasion, and can effectively avoid the phenomena of blistering, cracking and oxidation, and is especially suitable for the air environment with high salt content in coastal areas, and has very excellent application effect.

Description

Technical Field

[0001] This application relates to the field of damping backplates, and more specifically mentions a high-speed rail damping backplate based on an anti-corrosion coating and its preparation method. Background Technology

[0002] With the continuous expansion of the high-speed railway network, the damping backplate, as an important component of the external structure of high-speed trains, not only needs to withstand the noise and vibration generated during train operation, but also needs to have excellent corrosion resistance to cope with various harsh environmental conditions. Especially in coastal areas, where the salt content in the air is high, even higher requirements are placed on the corrosion resistance of the damping backplate.

[0003] Existing high-speed rail damping panels are typically made of metal and coated with an anti-corrosion coating to protect them from environmental factors. However, traditional anti-corrosion coatings are inadequate in high-salinity air environments, easily aging and peeling off, leading to corrosion of the metal substrate and consequently affecting the service life and safety of the entire sound barrier system. Furthermore, current technologies do not adequately consider how to effectively reduce salt spray accumulation on the panels, lacking targeted designs to optimize waterproofing and moisture resistance. This allows salt to adhere more easily to the surface and even penetrate into the metal material, accelerating the corrosion process. Summary of the Invention

[0004] Therefore, to effectively solve the aforementioned existing problems, this application provides a high-speed rail damping backplate based on an anti-corrosion coating and its preparation method. It mainly consists of two parts: the backplate itself and a special anti-corrosion coating. The anti-corrosion coating not only maintains the excellent corrosion and weather resistance of the backplate but also significantly improves its waterproof, moisture-resistant, and moisture-decomposition-resistant properties. Through an improved spraying process, the anti-corrosion coating forms a dense, uniform, and strongly adherent protective layer on the backplate surface. Even under prolonged exposure to corrosive media and moisture, the anti-corrosion coating maintains excellent adhesion and effectively prevents blistering, cracking, and oxidation. It is particularly suitable for the high-salinity air environment of coastal areas and exhibits excellent application results.

[0005] As a preferred embodiment, the high-speed rail damping backplate based on the anti-corrosion coating has a structure including a metal backplate layer as a base and an anti-corrosion coating on the surface of the metal backplate layer.

[0006] In a preferred embodiment, the thickness of the metal backing layer is 2 to 4 mm.

[0007] In a preferred embodiment, the metal backing layer is made of any one of aluminum alloy, stainless steel, or magnesium alloy.

[0008] In a preferred embodiment, the metal backing layer is made of aluminum alloy.

[0009] In a preferred embodiment, the thickness of the anti-corrosion coating is 60–120 μm.

[0010] In a preferred embodiment, the thickness of the anti-corrosion coating is 80–100 μm.

[0011] In a preferred embodiment, the anti-corrosion coating, by weight, comprises: 40-60 parts epoxy resin, 10-20 parts modified functional resin, 15-25 parts zinc-aluminum composite particles, 10-20 parts functional filler, 3-6 parts silane coupling agent, 1-3 parts UV resistant agent, 1.5-2.5 parts anti-settling agent, 3-8 parts additives, 1-3 parts curing agent, and 10-25 parts solvent.

[0012] In a preferred embodiment, the epoxy resin is a bisphenol A type epoxy resin or a bisphenol F type epoxy resin.

[0013] In a preferred embodiment, the epoxy resin is a bisphenol A type epoxy resin.

[0014] In a preferred embodiment, the mass ratio of the epoxy resin, modified functional resin and zinc-aluminum composite particles is (48-54):(12-19):(16-22).

[0015] In a preferred embodiment, the mass ratio of the epoxy resin, modified functional resin and zinc-aluminum composite particles is (50-53):(14-18):(17-19).

[0016] In a preferred embodiment, the modified functional resin is a modified polyurethane resin.

[0017] As a preferred embodiment, the preparation method of the modified polyurethane resin specifically includes the following steps: S1: Polypropylene glycol is added to a reaction vessel and stirred at room temperature for 10-15 min. 4,4'-Diphenylmethane diisocyanate is slowly added, and the temperature is maintained at 50-60°C while stirring for 20-30 min to ensure uniform mixing; S2: Hexafluorobutanol, N,N'-bis(2-hydroxyethyl)hexamethylenediamide, and trimethylolpropane triacrylate are added while continuously stirring. Each addition should be thoroughly stirred to ensure uniform distribution. The temperature is raised to 80-90°C, and stannous octoate is added and the reaction is maintained at this temperature for 4-5 h; S3: After the reaction in S2 is completed, the temperature is raised to 105-115°C, and N-hydroxymethylacrylamide and benzoyl peroxide are added. The reaction is maintained at this temperature for 3-4 h. After completion, the temperature is allowed to drop naturally to room temperature, and the mixture is sealed and stored at room temperature overnight. The final product is then obtained.

[0018] In a preferred embodiment, the number average molecular weight of the polypropylene glycol is 2000-2400 Da.

[0019] In a preferred embodiment, the mass ratio of polypropylene glycol to 4,4'-diphenylmethane diisocyanate is (46-48):(38-42).

[0020] In a preferred embodiment, the mass ratio of 4,4'-diphenylmethane diisocyanate, hexafluorobutanol, N,N'-bis(2-hydroxyethyl)hexamethylenediamide and trimethylolpropane triacrylate is (38-42):(3.5-4.5):(5-6):(3.5-4).

[0021] In a preferred embodiment, the mass ratio of trimethylolpropane triacrylate to N-hydroxymethylacrylamide is (3.5-4):(1.2-1.5).

[0022] By adding modified polyurethane resin as a functional resin, the corrosion resistance, waterproofing, and water decomposition resistance of the backing plate can be significantly improved. Its multi-functional groups greatly increase the cross-linking density within the resin system, significantly enhance the interaction and adhesion between resin molecular chains, and thus form a denser three-dimensional molecular chain network. This significantly enhances the resistance of the anti-corrosion coating to molecular chain slippage after curing, avoids the appearance of crazes on the coating surface, and reduces the size of micropores on the coating surface, reducing the presence of internal particles and the continuity and merging of micropores. Furthermore, it improves the coating's ability to block water molecule penetration and its overall steric hindrance after curing, suppressing the free rotation and movement frequency of internal resin chain segments, reducing unnecessary internal interactions during the curing period, and thus significantly enhancing the coating's water resistance and decomposition resistance.

[0023] In a preferred embodiment, the zinc-aluminum mass ratio in the zinc-aluminum composite particles is (0.8-1):(0.8-1).

[0024] In a preferred embodiment, the zinc-aluminum composite particles have a zinc-aluminum mass ratio of 1:1.

[0025] In a preferred embodiment, the average particle size of the zinc-aluminum composite particles is 10–15 μm.

[0026] In a preferred embodiment, the functional filler is a combination of pigment particles and wear-resistant particles.

[0027] In a preferred embodiment, the mass ratio of the pigment particles to the wear-resistant particles is (6-10):(2-5).

[0028] In a preferred embodiment, the mass ratio of the pigment particles to the wear-resistant particles is (7-8):(3-3.5).

[0029] In a preferred embodiment, the pigment particles are at least one of zinc oxide, titanium dioxide, iron oxide red, and carbon black.

[0030] In a preferred embodiment, the pigment particles are zinc oxide or titanium dioxide.

[0031] In a preferred embodiment, the wear-resistant particles are silicon dioxide.

[0032] In a preferred embodiment, the average particle size of the silica is 10-20 nm.

[0033] In a preferred embodiment, the silane coupling agent is a combination of 3-aminopropyltriethoxysilane and 3-glycidoxypropyltrimethoxysilane.

[0034] In a preferred embodiment, the mass ratio of 3-aminopropyltriethoxysilane to 3-glycidoxypropyltrimethoxysilane is (2-2.5):(4-5).

[0035] In a preferred embodiment, the UV resistant agent is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole or 2,4-dihydroxybenzophenone.

[0036] In a preferred embodiment, the UV resistant agent is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole.

[0037] In a preferred embodiment, the anti-settling agent is a combination of hydrogenated castor oil and polyethylene wax.

[0038] In a preferred embodiment, the mass ratio of the hydrogenated castor oil to polyethylene wax is (3-4):(1-1.8).

[0039] In a preferred embodiment, the mass ratio of hydrogenated castor oil to polyethylene wax is (3-3.5):(1.3-1.5).

[0040] In a preferred embodiment, the additive is a composition of hexafluoroisopropyl vinyl ether and polyether-modified polysiloxane.

[0041] In a preferred embodiment, the mass ratio of the hexafluoroisopropyl vinyl ether to the polyether-modified polysiloxane is (4-4.2):(2.2-2.5).

[0042] In a preferred embodiment, the viscosity of the polyether-modified polysiloxane is 500-1500 cP, and the condition is 25°C.

[0043] In a preferred embodiment, the viscosity of the polyether-modified polysiloxane is 800-1000 cP, and the condition is 25°C.

[0044] In a preferred embodiment, the curing agent is polyoxypropylene diamine.

[0045] In a preferred embodiment, the solvent is propylene glycol methyl ether acetate.

[0046] As a preferred embodiment, the preparation method of the high-speed rail damping backplate based on the anti-corrosion coating specifically includes the following steps: S1: At room temperature, epoxy resin and modified functional resin are stirred in a mixing container at a stirring speed of 600-800 rpm for 30-40 min. After stirring, zinc-aluminum composite particles, functional fillers, and anti-settling agents are added, and stirring is continued at the same speed for 20-30 min until all solid particles are dispersed evenly; S2: Silane coupling agent, UV resistant agent, and additives are added, and high-speed stirring is performed at a speed of 1200-1500 rpm for 40-50 min using a high-speed disperser. Then, curing agent and solvent are added and adjusted to the required viscosity. Large particles are removed by sieving through a 200-250 mesh sieve to obtain the anti-corrosion coating material; S3: The anti-corrosion coating material is sprayed onto the surface of the metal backplate layer including drainage grooves, heated to 80-100℃, and cured for 2-3 h. After curing, the product is obtained.

[0047] It should be noted that the high-speed rail damping backplate based on the anti-corrosion coating obtained in this application is a backplate structure on the outside of the damping structure. Its function is to provide external backplate protection for the damping structure. The backplate itself does not have damping characteristics.

[0048] The beneficial effects of this application are:

[0049] 1. The high-speed rail damping backplate based on the anti-corrosion coating provided in this application not only maintains the excellent anti-corrosion and weather resistance of the backplate, but also significantly improves its waterproof, moisture-resistant, and moisture-decomposition-resistant properties. The specific anti-corrosion coating on the surface forms a dense, uniform, and strongly adhesive protective layer on the backplate surface. Even under long-term exposure to corrosive media and moisture, the anti-corrosion coating can maintain excellent adhesion and effectively prevent blistering, cracking, and oxidation. It is especially suitable for the high-salt air environment in coastal areas and has excellent application effects.

[0050] 2. The high-speed rail damping backplate based on the anti-corrosion coating provided in this application can significantly improve the anti-corrosion, waterproof and water-decomposition resistance of the backplate by adding modified polyurethane resin as a modified functional resin. The modified polyurethane resin greatly enhances the interaction and adhesion between resin molecular chains, thereby forming a denser three-dimensional molecular chain network. This greatly enhances the resistance of the anti-corrosion coating to molecular chain slippage after curing, avoids the occurrence of silver craze cracks on the coating surface, reduces the size of micropores on the coating surface, reduces the presence of internal particles, and promotes the continuity and merging of micropores, providing a solid foundation for the waterproof, corrosion-resistant and decomposition-resistant properties of the backplate.

[0051] 3. The high-speed rail damping backplate based on the anti-corrosion coating provided in this application can also work together with the specific additives added in this application to further enhance the waterproof effect of the backplate surface, reduce cracks and damage, and form a smoother and more regular coating surface through the aggregation effect of the surface, thereby significantly reducing the amount of surface hydrated phase, thereby reducing the probability of water and active molecules penetrating, and helping to enhance corrosion resistance, waterproof performance and other properties. Detailed Implementation

[0052] The detailed embodiments will use specific examples to more intuitively demonstrate and illustrate the content of the invention described in this application. Furthermore, the following embodiments are merely practical examples used to illustrate and explain the technical solutions in the specification, and should not limit the scope of the claims to be protected by this application.

[0053] Example 1

[0054] The high-speed rail damping backplate based on the anti-corrosion coating has a structure including a metal backplate layer as a base and an anti-corrosion coating on the surface of the metal backplate layer.

[0055] The thickness of the metal backing layer is 3.2 mm; the thickness of the anti-corrosion coating is 85 μm.

[0056] The metal backing layer is made of high-strength aluminum alloy 6061-T6.

[0057] The anti-corrosion coating, by weight, consists of the following raw materials: 50.6 parts epoxy resin, 16.8 parts modified functional resin, 18.5 parts zinc-aluminum composite particles, 14.5 parts functional filler, 3.8 parts silane coupling agent, 1.8 parts UV resistant agent, 2.1 parts anti-settling agent, 6.5 parts additives, 1.4 parts curing agent, and 12.5 parts solvent.

[0058] The epoxy resin is a bisphenol A type epoxy resin, purchased from Baling Petrochemical in China as E44 model product.

[0059] The modified functional resin is a modified polyurethane resin. The preparation method of the modified polyurethane resin specifically includes the following steps, by weight: S1: Add 47.6 parts of polypropylene glycol to the reaction vessel and stir at room temperature for 15 min. Slowly add 41.2 parts of 4,4'-diphenylmethane diisocyanate, maintain the temperature at 55℃ and stir for 25 min to ensure uniform mixing; S2: Add 4.2 parts of hexafluorobutanol, 5.5 parts of N,N'-bis(2-hydroxyethyl)hexamethylenediamide and 3.8 parts of trimethylolpropane triacrylate while stirring continuously. After each addition, stir thoroughly to ensure uniform distribution. Raise the temperature to 85℃ and add 0.23 parts of stannous octoate and keep the reaction at room temperature for 4.5 h; S3: After the reaction in S2 is completed, raise the temperature to 110℃ and add 1.6 parts of N-hydroxymethylacrylamide and 0.03 parts of benzoyl peroxide. Keep the reaction at room temperature for 3.5 h. After completion, allow it to cool naturally to room temperature, seal and store at room temperature overnight. The product is then obtained.

[0060] The number average molecular weight of the polypropylene glycol is 2200 Da, and it was purchased from Haian Petrochemical Co., Ltd. in Jiangsu Province, China, which sells products with the corresponding molecular weight.

[0061] The zinc-aluminum composite particles have a zinc-aluminum mass ratio of 1:1.

[0062] The average particle size of the zinc-aluminum composite particles is 12.8 μm.

[0063] The functional filler is a composition of pigment particles and wear-resistant particles in a mass ratio of 7.5:3.2.

[0064] The pigment particles are titanium dioxide.

[0065] The wear-resistant particles are made of silicon dioxide with an average particle size of 15 nm.

[0066] The silane coupling agent is a composition of 3-aminopropyltriethoxysilane and 3-glycidoxypropyltrimethoxysilane in a mass ratio of 2.3:4.5.

[0067] The UV resistant agent is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole.

[0068] The anti-settling agent is a composition of hydrogenated castor oil and polyethylene wax in a mass ratio of 3.5:1.3.

[0069] The additive is a composition of hexafluoroisopropyl vinyl ether and polyether-modified polysiloxane in a mass ratio of 4:2.5.

[0070] The viscosity of the polyether-modified polysiloxane is 850 cP, under the condition of 25°C, and it is a product of the corresponding viscosity purchased from Hubei Xinyuhong Biomedical Technology Co., Ltd., China.

[0071] The curing agent was polyoxypropylene diamine, purchased from Huntsman Corporation, USA, specifically the Jeffamine D-230 product.

[0072] The solvent is propylene glycol methyl ether acetate.

[0073] The preparation method of the high-speed rail damping backplate based on anti-corrosion coating includes the following steps: S1: At room temperature, epoxy resin and modified functional resin are stirred in a mixing container at a stirring speed of 650 rpm for 35 min. After stirring, zinc-aluminum composite particles, functional fillers and anti-settling agents are added, and then stirring is continued at the same speed for 25 min until all solid particles are dispersed evenly; S2: Silane coupling agent, UV resistant agent and additives are added, and high-speed stirring is carried out at a speed of 1400 rpm for 45 min with a high-speed disperser. Then, curing agent and solvent are added and adjusted to the required viscosity. Large particles are removed by sieving through a 240-mesh sieve to obtain the anti-corrosion coating material; S3: The anti-corrosion coating material is sprayed onto the surface of the metal backplate layer including drainage grooves, heated to 90℃, and kept warm for 2.5 h for curing. After curing, the product is obtained.

[0074] Example 2

[0075] The only difference between this embodiment and Example 1 is as follows: The anti-corrosion coating, by weight, consists of the following raw materials: 48.2 parts epoxy resin, 12 parts modified functional resin, 21.6 parts zinc-aluminum composite particles, 12.5 parts functional filler, 3.2 parts silane coupling agent, 1.6 parts UV resistant agent, 1.8 parts anti-settling agent, 6.8 parts additives, 1.2 parts curing agent, and 9.8 parts solvent.

[0076] The zinc-aluminum composite particles have a zinc-aluminum mass ratio of 0.8:1.

[0077] The functional filler is a composition of pigment particles and wear-resistant particles in a mass ratio of 8:3.

[0078] The silane coupling agent is a composition of 3-aminopropyltriethoxysilane and 3-glycidoxypropyltrimethoxysilane in a mass ratio of 2:5.

[0079] The additive is a composition of hexafluoroisopropyl vinyl ether and polyether-modified polysiloxane in a mass ratio of 4.2:2.2.

[0080] Example 3

[0081] The only difference between this embodiment and Example 1 is as follows: 54 parts epoxy resin, 19 parts modified functional resin, 16.5 parts zinc-aluminum composite particles, 15.5 parts functional filler, 4.1 parts silane coupling agent, 2.1 parts UV resistant agent, 2.2 parts anti-settling agent, 6.2 parts additives, 1.6 parts curing agent, and 18.8 parts solvent.

[0082] The zinc-aluminum composite particles have a zinc-aluminum mass ratio of 1:0.8.

[0083] The functional filler is a composition of pigment particles and wear-resistant particles in a mass ratio of 7:3.4.

[0084] The silane coupling agent is a composition of 3-aminopropyltriethoxysilane and 3-glycidoxypropyltrimethoxysilane in a mass ratio of 2.5:4.

[0085] The additive is a composition of hexafluoroisopropyl vinyl ether and polyether-modified polysiloxane in a mass ratio of 4.1:2.3.

[0086] Comparative Example 1

[0087] The only difference between this comparative example and Example 1 is as follows: the anti-corrosion coating, by weight, consists of the following raw materials: 50.6 parts epoxy resin, 6.5 parts modified functional resin, 18.5 parts zinc-aluminum composite particles, 14.5 parts functional filler, 3.8 parts silane coupling agent, 1.8 parts UV resistant agent, 2.1 parts anti-settling agent, 6.5 parts additives, 1.4 parts curing agent, and 12.5 parts solvent.

[0088] Comparative Example 2

[0089] The only difference between this comparative example and Example 1 is as follows: the anti-corrosion coating, by weight, consists of the following raw materials: 50.6 parts epoxy resin, 16.8 parts modified functional resin, 18.5 parts zinc-aluminum composite particles, 10.5 parts functional filler, 3.8 parts silane coupling agent, 1.8 parts UV resistant agent, 2.1 parts anti-settling agent, 2.4 parts additives, 1.4 parts curing agent, and 12.5 parts solvent.

[0090] Comparative Example 3

[0091] The only difference between this comparative example and Example 1 is as follows: The preparation method of the modified polyurethane resin specifically includes the following steps, by weight: S1: Add 60 parts of polypropylene glycol to the reaction vessel and stir at room temperature for 15 min. Slowly add 35.5 parts of 4,4'-diphenylmethane diisocyanate, maintain the temperature at 55°C and stir for 25 min to ensure uniform mixing; S2: Add 4.2 parts of hexafluorobutanol, 5.5 parts of N,N'-bis(2-hydroxyethyl)hexamethylenediamide and 3.8 parts of trimethylolpropane triacrylate while continuously stirring. After each addition, stir thoroughly to ensure uniform distribution. Raise the temperature to 85°C and add 0.23 parts of stannous octoate and keep the reaction at room temperature for 4.5 h; S3: After the reaction in S2 is completed, raise the temperature to 110°C and add 1.6 parts of N-hydroxymethylacrylamide and 0.03 parts of benzoyl peroxide. Keep the reaction at room temperature for 3.5 h. After completion, allow it to cool naturally to room temperature, seal and store at room temperature overnight. The product is then obtained.

[0092] Comparative Example 4

[0093] The only difference between this comparative example and Example 1 is as follows: The preparation method of the modified polyurethane resin specifically includes the following steps, by mass: S1: Add 47.6 parts of polypropylene glycol to the reaction vessel and stir at room temperature for 15 min. Slowly add 41.2 parts of 4,4'-diphenylmethane diisocyanate, maintain the temperature at 55°C and stir for 25 min to ensure uniform mixing; S2: Add 2.1 parts of hexafluorobutanol, 1.2 parts of N,N'-bis(2-hydroxyethyl)hexamethylenediamide and 1 part of trimethylolpropane triacrylate while continuously stirring. After each addition, stir thoroughly to ensure uniform distribution. Raise the temperature to 85°C and add 0.18 parts of stannous octoate and keep the reaction at room temperature for 4.5 h; S3: After the reaction in S2 is completed, raise the temperature to 110°C and add 0.2 parts of N-hydroxymethylacrylamide and 0.01 parts of benzoyl peroxide. Keep the reaction at room temperature for 3.5 h. After completion, allow it to cool naturally to room temperature, seal and store at room temperature overnight. The product is then obtained.

[0094] Comparative Example 5

[0095] The only difference between this comparative example and Example 1 is that the silane coupling agent is a composition of 3-aminopropyltriethoxysilane and 3-glycidoxypropyltrimethoxysilane in a mass ratio of 3:1.

[0096] Comparative Example 6

[0097] The only difference between this comparative example and Example 1 is that the additive is a composition of hexafluoroisopropyl vinyl ether and polyether-modified polysiloxane in a mass ratio of 8:1.

[0098] Comparative Example 7

[0099] The only difference between this comparative example and Example 1 is that the additive is a composition of hexafluoroisopropyl vinyl ether and polyether-modified polysiloxane in a mass ratio of 1:1.

[0100] Performance Evaluation

[0101] 1. The backsheets prepared in the examples and comparative examples were subjected to salt spray corrosion resistance tests. The test environment was 35±2℃, the humidity was 90±3%, the test solution was 7.5wt% NaCl solution, and the spraying rate was 2mL / 16h·80cm. 2 The salt spray corrosion resistance hours were obtained and the results are recorded in Table 1.

[0102] 2. The backplates prepared in the examples and comparative examples were subjected to a surface water contact angle test using the seated drop method. The water droplet volume was 3.5 μL, and the recording time was 60 s. The final water contact angle was recorded, and the results are recorded in Table 1.

[0103] 3. The backsheets prepared in the examples and comparative examples were subjected to heat resistance stability tests. The backsheet samples were placed in a constant temperature and humidity chamber at a temperature of 60±2℃ and a humidity of 75±2% and observed for 6 months. After 6 months, they were taken out and observed for any damage, cracking, peeling, or blistering. If any of these were found, the sample was considered qualified; otherwise, it was considered unqualified. 50 samples were tested in each group. If the number of unqualified samples was ≤2, it was classified as Grade A; if the number of unqualified samples was ≤5, it was classified as Grade B; and if the number of unqualified samples was >5, it was classified as Grade C. The test results were recorded in Table 1.

[0104] 4. The backplates prepared in the examples and comparative examples were subjected to a water boiling decomposition test. The coating was 0.5m away from the water surface and the test water temperature was 96±2℃. Samples were taken every 2 hours for observation to check whether the anti-corrosion coating of the backplate was damaged, cracked, peeled off or blistered. The test time (h) when the above phenomena first appeared was recorded and the results were recorded in Table 1.

[0105] Table 1 Performance Test Results

[0106]

[0107]

[0108] From the final performance test results of the examples and comparative examples, comparative examples 1-7 achieved worse performance results compared to the examples. However, the examples, due to the use of specific modified polyurethane resin and additive combinations, were able to significantly enhance the resistance of the backplate anti-corrosion coating system to molecular chain slippage, avoid the occurrence of silver craze cracks on the coating surface, reduce the size of micropores on the coating surface, reduce the presence of internal particles, and decrease the continuity and merging of micropores. In addition, this improved the coating's ability to block water molecule penetration and its overall steric hindrance after curing, suppressed the free rotation and movement frequency of internal resin chain segments, reduced unnecessary internal interactions during the curing period, and thus significantly enhanced the coating's water resistance, corrosion resistance, and decomposition resistance.

Claims

1. A high-speed rail damping surface backboard based on an anticorrosive coating, characterized in that: The structure comprises a metal backboard layer as a substrate, and an anticorrosion coating layer on the surface of the metal backboard layer; The thickness of the metal backboard layer is 2-4 mm, and the material is any one of aluminum alloy, stainless steel or magnesium alloy; The thickness of the anticorrosion coating layer is 60-120 μm, and the raw materials are as follows in mass fraction: epoxy resin 40-60 parts, modified functional resin 10-20 parts, zinc-aluminum composite particles 15-25 parts, functional filler 10-20 parts, silane coupling agent 3-6 parts, ultraviolet resistant agent 1-3 parts, anti-settling agent 1.5-2.5 parts, auxiliary agent 3-8 parts, curing agent 1-3 parts, and solvent 10-25 parts; The epoxy resin is bisphenol A type or bisphenol F type; The mass ratio of zinc to aluminum in the zinc-aluminum composite particles is (0.8-1):(0.8-1); The functional filler is a combination of pigment particles and wear-resistant particles, and the mass ratio is (6-10):(2-5); The modified functional resin is modified polyurethane resin, and the preparation method comprises the following steps: S1: polypropylene glycol is added into a reaction container and stirred at room temperature for 10-15 min, 4,4'-diphenyl methane diisocyanate is slowly added, stirring is maintained at 50-60 ℃ for 20-30 min and uniform mixing is ensured; S2: hexafluorobutanol, N,N'-bis(2-hydroxyethyl)adipamide and trimethylolpropane triacrylate are added under continuous stirring, and each addition is fully stirred to ensure uniform distribution, the temperature is raised to 80-90 ℃, and stannous octoate is added for 4-5 h of heat preservation reaction; S3: after the reaction in S2 is completed, the temperature is raised to 105-115 ℃, N-hydroxymethyl acrylamide and dibenzoyl peroxide are added, and heat preservation reaction is carried out for 3-4 h, and after completion, it is naturally reduced to room temperature, sealed and stored overnight at room temperature, and after completion, it is obtained; The mass ratio of polypropylene glycol to 4,4'-diphenyl methane diisocyanate is (46-48):(38-42); The mass ratio of 4,4'-diphenyl methane diisocyanate, hexafluorobutanol, N,N'-bis(2-hydroxyethyl)adipamide and trimethylolpropane triacrylate is (38-42):(3.5-4.5):(5-6):(3.5-4); The mass ratio of trimethylolpropane triacrylate to N-hydroxymethyl acrylamide is (3.5-4):(1.2-1.5); The auxiliary agent is a combination of hexafluoroisopropyl vinyl ether and polyether modified polysiloxane, and the mass ratio is (4-4.2):(2.2-2.5); the viscosity of the polyether modified polysiloxane is 500-1500 cP at 25 ℃; The mass ratio of the epoxy resin, the modified functional resin and the zinc-aluminum composite particles is (48-54):(12-19):(16-22).

2. The high-speed rail damping face back plate based on the anticorrosive coating according to claim 1, characterized in that: The number average molecular weight of the polypropylene glycol is 2000-2400 Da.

3. The high-speed rail damping face back plate based on the anticorrosive coating according to claim 2, characterized in that: The average particle size of the zinc-aluminum composite particles is 10-15 μm.

4. The high-speed rail damping face back plate based on the anti-corrosion coating according to claim 3, characterized in that: The wear-resistant particles are silicon dioxide, and the average particle size of the silicon dioxide is 10-20 nm.

5. The high-speed rail damping face back plate based on the anti-corrosion coating according to claim 4, characterized in that: The silane coupling agent is a combination of 3-aminopropyl triethoxysilane and 3-glycidyl ether oxygen propyl trimethoxysilane; the mass ratio of the 3-aminopropyl triethoxysilane and 3-glycidyl ether oxygen propyl trimethoxysilane is (2-2.5):(4-5).

6. A method for preparing a high-speed rail damping backboard based on an anti-corrosion coating according to any one of claims 1-5, characterized in that: Specifically comprising the following steps: S1: stirring the epoxy resin and the modified functional resin in a mixing container at room temperature, the stirring speed is 600-800 rpm, the stirring time is 30-40 min, after the stirring is completed, the zinc-aluminum composite particles, the functional filler and the anti-settling agent are added, then the stirring is continuously carried out at the same speed for 20-30 min until the solid particles are completely and uniformly dispersed; S2: adding the silane coupling agent, the ultraviolet resistant agent and the auxiliary agent, stirring at high speed by using a high-speed dispersion machine at a speed of 1200-1500 rpm for 40-50 min, then adding the curing agent and the solvent and adjusting to the required viscosity, removing the large particles by sieving 200-250 meshes, to obtain the anti-corrosion coating material; S3: spraying the anti-corrosion coating material on the surface of the metal back plate layer comprising a drainage groove, heating to 80-100 ℃, and heat curing for 2-3 h, to obtain the anti-corrosion coating material after the curing is completed.

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