Long-acting coating for electrical equipment of offshore wind power platform, preparation method and application

Abstract

The invention belongs to the technical field of coatings, and particularly relates to a long-acting coating for offshore wind power platform electrical equipment, a preparation method and application. According to the invention, the water-based acrylic resin containing glycidyl methacrylate is used as a matrix, and the active epoxy group of the water-based acrylic resin can form firm chemical bonding with the rubber sealing element, so that the adhesive force and the vibration fatigue resistance of the coating are greatly enhanced, and meanwhile, molecular bridging among the resin, the filler and the base material is realized; rutile titanium dioxide, flaky talcum powder and various nano oxides are compounded to obtain a pigment filler, and the pigment filler has good absorption performance on an infrared band with the wavelength of 2-10 [mu] m; meanwhile, the light reflecting performance of the filler is good, so that the coating has excellent ultraviolet shielding, labyrinth type physical blocking and efficient heat dissipation functions; the coating can remarkably improve the electrochemical impedance of the rubber sealing element, effectively inhibits color difference change, shows excellent salt mist resistance, ultraviolet resistance and'thermal-electrochemical 'synergistic corrosion resistance, and is good in durability.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and particularly relates to a long-lasting coating for electrical equipment of offshore wind power platforms, its preparation method, and its application. Background Technology

[0002] In the extreme marine environment characterized by strong corrosion, high vibration, and wide temperature variation, wind power electrical equipment (such as terminals, sensor housings, transformer bushings, and cable joints) faces severe challenges. These devices are exposed to high salt spray, continuous vibration (10–100 Hz), and drastic temperature fluctuations (-20°C to 60°C) for extended periods, leading to severe failure of critical seals (such as sealants and protective layers), resulting in multiple hazards: (1) Sealant aging and cracking, seawater infiltration causing electrochemical corrosion of terminals, and the extreme environment accelerating the aging, hardening, and cracking of seals, resulting in loss of sealing. Seawater can penetrate into the equipment, directly contacting metal parts, causing severe electrochemical corrosion, leading to equipment damage or even loss of function; (2) Insulation performance degradation, the infiltrated salt spray moisture evaporates and crystallizes on the insulation surface or in the gaps of the equipment to form salt crystals. Salt crystals are conductive and generate "creep" under the action of an electric field, which leads to a significant decrease in insulation performance or even short circuit, causing equipment burnout; (3) Dynamic fatigue debonding, continuous high-frequency vibration causes the sealing material to be subjected to repeated stress, resulting in fatigue debonding at the bonding interface with the substrate. The sealing layer peels off and falls off, losing protection for the internal conductors or connection points, further aggravating corrosion and short circuit risks. These electrochemical corrosion, insulation failure short circuit and mechanical peeling problems directly caused by the failure of the sealing components are the core reasons for catastrophic accidents of offshore wind power electrical equipment. In response to the multidimensional corrosion risks of offshore electrical equipment, it is necessary to develop protective technologies that combine long-term sealing performance, electrical insulation reliability and fatigue resistance. The most effective solution is to use special long-term coatings to fully cover the equipment interface, gaps and shell, and to achieve the purpose of corrosion prevention by constructing a triple synergistic protective layer of "physical isolation-electrochemical shielding-mechanical buffer".

[0003] High thermal conductivity is crucial for ensuring reliable equipment operation. However, existing environmentally friendly water-based coatings generally have poor thermal conductivity, failing to meet the heat dissipation requirements of high-power equipment. This is especially problematic in areas with intense solar radiation (the average annual radiation intensity in equatorial seas reaches 1.373 kW / m²). 2Under the combined effect of heat generated by the equipment itself, the surface temperature of the metal electrical casing can reach 70-80℃ in summer, far exceeding the temperature of the surrounding seawater environment (25-30℃). This not only exacerbates the thermal aging of the material, but also creates a huge temperature difference between the metal surface and the interior, inducing a unique and serious risk of "thermal-electrochemical" synergistic corrosion. This temperature rise effect leads to three hazards: (1) accelerated corrosion kinetics; (2) degradation of sealing materials; and (3) collapse of insulation performance. Taking the junction box of an offshore wind power transformer as an example, its aluminum alloy casing forms a high-temperature hot spot of 80℃ under direct sunlight. The internal epoxy sealant develops microcracks due to the mismatch of thermal expansion coefficients. High-salt moisture penetrates along the cracks, causing intergranular corrosion, which ultimately leads to short circuit and shutdown of the equipment.

[0004] High-intensity ultraviolet radiation is a typical characteristic of the marine environment, and its destructiveness far exceeds that of land-based conditions. Due to the combined effects of enhanced reflection from the sea surface and reduced atmospheric attenuation, the intensity of ultraviolet radiation received by offshore platforms is as high as 1.8 times that of inland areas. Ultraviolet light (accounting for about 2% of sunlight) has high energy and can trigger photo-oxidative degradation of the polymer chains in coatings, leading to powdering, loss of gloss, discoloration, embrittlement, and even peeling of the coating, resulting in the loss of the physical barrier effect on the substrate and potentially damaging the chemical anti-corrosion function of the coating (such as the failure of corrosion inhibitors). Equipment materials exposed to the atmosphere directly suffer from this damage. This continuous radiation triggers a triple degradation crisis for the protective adhesives of electrical equipment: (1) molecular chain breakage; (2) free radical corrosion; (3) surface powdering. Taking the sealant of offshore wind power converters as an example, its polyurethane-based adhesive developed network microcracks due to ultraviolet aging after two years of service in the South China Sea. High-salt moisture penetration caused electrolytic corrosion of the IGBT modules, resulting in extremely high maintenance costs.

[0005] Offshore wind power platforms face near-limiting requirements for the protective sealing of electrical equipment due to their extremely harsh environment. As a protective barrier, the sealing strips age significantly faster under these conditions. Once the sealing strips fail due to aging, it directly leads to a loss of protection level for the electrical equipment, causing serious malfunctions such as internal short circuits and corrosion, resulting in costly equipment damage and power generation loss. At the same time, the difficulties and extremely high costs of offshore operation and maintenance make preventing and repairing sealing problems exceptionally challenging and expensive. Therefore, the aging problem of sealing strips is not a trivial matter; it is one of the key factors affecting the long-term safe and stable operation, economic benefits, and return on investment of offshore wind farms. To address the above three types of problems encountered by metal materials in the application of electrical equipment on offshore wind power platforms, a long-lasting coating with heat dissipation, UV protection, and corrosion resistance has been developed. This can significantly reduce the wear and tear of metal materials and improve the stable operation and safety of electrical equipment on offshore platforms. Summary of the Invention

[0006] To address the aforementioned problems in the existing technology, this invention provides a long-lasting coating for electrical equipment of offshore wind power platforms, its preparation method, and its application. Spraying this coating onto rubber seals can make the rubber seals durable and long-lasting.

[0007] To achieve the above objectives, the technical solution provided by the present invention is as follows: In a first aspect, this application provides a long-lasting coating for electrical equipment of offshore wind power platforms, comprising the following raw materials in parts by weight: 45-75 parts of high molecular functional resin; 20-40 parts of pigments and fillers; Dispersant 0.5~0.7 parts 2.2-5.5 parts of auxiliary agents; 20-25 parts deionized water; Among them, functional polymer resins include waterborne acrylic resins; The pigments and fillers include titanium dioxide, talc, and nano-oxides.

[0008] Optionally, the preparation of the waterborne acrylic resin includes the following raw materials in parts by weight: 5-8 parts styrene, 25-35 parts methyl methacrylate, 7-10 parts butyl acrylate and 18-25 parts glycidyl methacrylate.

[0009] Optionally, styrene, methyl methacrylate, butyl acrylate, glycidyl methacrylate and emulsifier are mixed and polymerized under the action of an initiator to obtain the waterborne acrylic resin.

[0010] Optionally, the additives include the following components in parts by weight: 1-3 parts antioxidant; 0.2-0.5 parts defoamer; and 1-2 parts diluent.

[0011] Optionally, the titanium dioxide is rutile titanium dioxide; and / or, the nano-oxide includes one or more of nano-alumina, nano-zirconia, and nano-silica.

[0012] Optionally, the mass ratio of titanium dioxide, talc and nano-oxide in the pigments and fillers is 3:(1.5-2.5):(4-6).

[0013] Optionally, the defoamer is a polysiloxane-polyether copolymer; and / or, the antioxidant is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole.

[0014] Optionally, titanium dioxide, talc, and nano-oxides are added to a solvent, ultrasonically dispersed, and then dried to obtain the pigments and fillers.

[0015] Secondly, this application also provides a method for preparing the long-lasting coating for electrical equipment of offshore wind power platforms as described in the first aspect, characterized by comprising: adding a dispersant and half a part by weight of an additive to deionized water and stirring, then adding pigments and fillers and dispersing them evenly at a rotation speed of 1500-2500 r / min; reducing the rotation speed to 500-1000 r / min, adding the other half part by weight of the additive, then adding a high-molecular functional resin, and stirring to obtain the long-lasting coating for electrical equipment of offshore wind power platforms.

[0016] Thirdly, this application also provides the application of the long-lasting coating for offshore wind power platform electrical equipment described in the first aspect in the rubber seals of offshore wind power platform electrical equipment.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: This invention innovatively uses waterborne acrylic resin containing glycidyl methacrylate as the matrix. Its active epoxy groups can form a strong chemical bond with the rubber seal, which greatly enhances the coating adhesion and vibration fatigue resistance. At the same time, it realizes the molecular bridging between the resin, filler and substrate.

[0018] In terms of pigment and filler system, a unique compound of rutile titanium dioxide, flake talc powder and various nano-oxide pigments and fillers is used. These pigments and fillers have excellent absorption performance in the infrared band with wavelengths of 2-10μm. At the same time, the fillers have good reflective properties, which makes the material contain a large number of emission interfaces and scattering particles, reflecting and scattering radiant heat, effectively achieving heat dissipation. This gives the coating excellent UV shielding, labyrinthine physical barrier and efficient heat dissipation functions.

[0019] The present invention uses parallel stacked talc flakes to extend the Cl- penetration path. Glycidyl methacrylate can simultaneously bridge the sealing substrate, nanofiller and resin, achieving a four-in-one effect of chemical passivation, physical barrier, thermal management and ultraviolet shielding, breaking through the functional boundaries of traditional coatings. During the preparation process, the nanofillers were added stepwise and the rotation speed was controlled to ensure uniform dispersion and activity of resin functional groups, ultimately forming a dense and stable nanocomposite protective structure.

[0020] The coating of this invention can significantly improve the electrochemical impedance of rubber seals, effectively suppress color difference changes, and exhibit excellent resistance to salt spray, ultraviolet radiation and "thermal-electrochemical" synergistic corrosion. It improves the durability of seals used for sealing electrical equipment and fundamentally solves the problems of seal failure, insulation performance degradation and corrosion caused by multiple environmental stresses in offshore wind power electrical equipment. Attached Figure Description

[0021] Figure 1The image shows the color difference performance of the long-lasting coating sprayed onto the rubber seal in the example. Figure 2 The image shows the infrared absorption spectrum of the long-lasting coating in the example. Figure 3 The image shows the electrochemical impedance spectroscopy (EIS) spectrum of the long-lasting coating in the examples. Figure 4 The equivalent circuit diagram used to fit the EIS of long-lasting coatings; Figure 5 The image shows the XRD pattern of the pigments and fillers. Figure 6 The images show the SEM and EDS spectra of the pigments and fillers. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings: Unless otherwise specified, the experimental methods used in the embodiments of this invention are all conventional methods.

[0023] All reagents and materials used in this example can be purchased routinely. The quantitative experiments involved in the examples were all repeated at least three times, and the results were averaged.

[0024] Raw material source: Polysiloxane-polyether copolymer: Industrial grade, Qingdao Enze Chemical Co., Ltd.; Rutile titanium dioxide: Industrial grade, Shanghai Yuejiang Titanium Dioxide Chemical Products Co., Ltd.; Talc: Analytical grade, Shanghai Maclean Biochemical Technology Co., Ltd.; Nano-alumina powder: analytical grade, Shanghai Maclean Biochemical Technology Co., Ltd.; Nano-zirconia: analytical grade, Shanghai Maclean Biochemical Technology Co., Ltd.; Nano silica: analytical grade, Shanghai Maclean Biotechnology Co., Ltd.; Rubber seals: Industrial grade, Nangong Liyou Rubber Products Factory; Commercially available water-based acrylic anti-corrosion coating: industrial grade, Shenzhen Deyi Coatings Technology Co., Ltd. Example

[0025] This embodiment provides a long-lasting coating for electrical equipment of offshore wind power platforms, comprising the following raw materials by weight: 60g water-based acrylic resin, 20g pigments and fillers, 1g antioxidant, 0.2g defoamer, 1g diluent, 0.5g dispersant, 20g deionized water; The preparation method of waterborne acrylic resin is as follows: 6g styrene, 28g methyl methacrylate, 8g butyl acrylate, 18g glycidyl methacrylate, 1.8g emulsifier, and 30g deionized water are mixed and pre-emulsified by high-speed stirring to form a stable monomer pre-emulsion. Then, under nitrogen protection, 60g deionized water, approximately 10-15% of the pre-emulsion (6-9g), and a small amount of initiator solution (0.036g ammonium persulfate dissolved in 3.6g water) are added to the reactor, and the temperature is raised to 80℃ to form a seed emulsion. Next, at a constant temperature of 80-85℃, the remaining pre-emulsion and initiator solution are slowly added dropwise over 3 hours. After the addition is complete, the reaction is maintained at this temperature for 1 hour, and then the temperature is raised to 85-90℃ for maturation for 0.5 hours. Finally, the emulsion is cooled to 40-50℃, the pH is adjusted to 7-8 with 10% ammonia water, and the mixture is filtered through a 200-mesh sieve to obtain a stable waterborne acrylic ester emulsion. The antioxidant is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole; the defoamer is a polysiloxane-polyether copolymer; the diluent is ethylene glycol; and the dispersant is dispersant 5040. The preparation method of the pigments and fillers is as follows: rutile titanium dioxide, talc powder and nano alumina powder are added to anhydrous ethanol solvent in a mass ratio of 3:2:5 and mixed. The mixture is then ultrasonically dispersed for 4 hours, and finally filtered and dried to obtain the pigments and fillers.

[0026] The preparation steps of the long-lasting coating for electrical equipment of offshore wind power platforms in this embodiment are as follows: Add 0.5g dispersant 5040, 0.5g 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 0.1g polysiloxane-polyether copolymer, and 0.5g ethylene glycol to 20g deionized water. Then add 20g pigments and fillers and stir at 1800r / min to disperse evenly. Reduce the speed to 600r / min, and add 0.5g 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 0.1g polysiloxane-polyether copolymer, and 0.5g ethylene glycol. Then add 60g water-based acrylic resin and mix thoroughly to obtain a white coating, which is a long-lasting coating for electrical equipment of offshore wind power platforms.

[0027] A coating was obtained by spraying white paint onto the rubber (sealant), with an average coating thickness of 73.8 μm. Example

[0028] This embodiment provides a long-lasting coating for electrical equipment of offshore wind power platforms, comprising the following raw materials by weight: 60g water-based acrylic resin, 20g pigments and fillers, 1g antioxidant, 0.2g defoamer, 1g diluent, 0.5g dispersant, 20g deionized water; The preparation method of the waterborne acrylic resin is as follows: 6g of styrene, 28g of methyl methacrylate, 8g of butyl acrylate, and 18g of glycidyl methacrylate are mixed, and 1.8g of emulsifier (approximately 3% of the total monomer mass) and 30g of deionized water are added. Pre-emulsification is carried out under high-speed stirring to form a stable monomer emulsion. Subsequently, under nitrogen protection, 60g of deionized water, approximately 10% of the pre-emulsion (approximately 6g), and a portion of the initiator solution (approximately 10% of a solution prepared by dissolving 0.36g of ammonium persulfate in 3.6g of water) are added to the reactor. The temperature is slowly raised to 80℃ and maintained for 20-30 minutes to form a seed emulsion. Then, under constant temperature conditions of 80-85℃, the remaining pre-emulsion and the remaining initiator solution are added dropwise simultaneously and slowly over 3 hours. After the addition is completed, the reaction is maintained at this temperature for another hour. The system is then heated to 85-90℃ and matured for 0.5 hours. After the reaction is complete, the emulsion is cooled to 40-50℃, the pH is adjusted to 7-8 with 10% ammonia water, and finally filtered through a 200-mesh sieve to obtain a stable waterborne acrylic emulsion. Among them: the antioxidant is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, the defoamer is polysiloxane-polyether copolymer, the diluent is ethylene glycol, and the dispersant is dispersant 5040.

[0029] The preparation method of pigments and fillers is as follows: rutile titanium dioxide, talc powder, nano alumina powder, nano zirconium oxide, and nano silica are mixed in anhydrous ethanol solvent at a mass ratio of 3:2:3:1:1, ultrasonically dispersed for 4 hours, and then filtered and dried to obtain pigments and fillers.

[0030] The preparation steps of the long-lasting coating for electrical equipment of offshore wind power platforms in this embodiment are as follows: Add 0.5g dispersant 5040, 0.5g 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 0.1g polysiloxane-polyether copolymer, and 0.5g ethylene glycol to 20g deionized water. Then add 20g pigment and filler composite material and stir at 1800r / min to disperse evenly. Reduce the speed to 600r / min, and add 0.5g 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 0.1g polysiloxane-polyether copolymer, and 0.5g ethylene glycol. Then add 60g water-based acrylic resin and mix thoroughly to obtain a white coating, which is a long-lasting coating for electrical equipment of offshore wind power platforms.

[0031] A coating was obtained by spraying white paint onto rubber, with an average thickness of 85.3 μm. Example

[0032] This embodiment provides a long-lasting coating for electrical equipment of offshore wind power platforms, comprising the following raw materials by weight: 65g water-based acrylic resin, 30g pigments and fillers, 1g antioxidant, 0.2g defoamer, 1g diluent, 0.5g dispersant, 20g deionized water; The preparation method of the waterborne acrylic resin is as follows: 5g styrene, 33g methyl methacrylate, 7g butyl acrylate, and 20g glycidyl methacrylate are mixed, and approximately 2.0g emulsifier and 30g deionized water are added. The mixture is pre-emulsified by high-speed stirring for 30-45 minutes to form a stable monomer emulsion. Subsequently, under continuous nitrogen protection, 70g deionized water, approximately 10-15% of the pre-emulsion (6.5-9.8g), and a portion of the initiator solution (approximately 10% of a solution prepared by dissolving 0.4g ammonium persulfate in 4g water) are added to the reactor. The temperature is slowly raised to 80℃ and maintained for 20-30 minutes to form a seed emulsion. Then, under constant temperature of 80-85℃, the remaining pre-emulsion and the remaining initiator solution are added dropwise simultaneously and slowly over 3 hours. After the addition is completed, the reaction is maintained at this temperature for another hour. The system is then heated to 85-90℃ and matured for 0.5 hours. After the reaction is complete, the emulsion is cooled to 40-50℃, the pH is adjusted to 7-8 with 10% ammonia water, and finally filtered through a 200-mesh sieve to obtain a stable waterborne acrylic emulsion. Among them, the antioxidant is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, the defoamer is polysiloxane-polyether copolymer, the diluent is ethylene glycol, and the dispersant is dispersant 5040; The preparation method of the pigments and fillers is as follows: rutile titanium dioxide, talc powder and nano alumina powder are added to anhydrous ethanol solvent in a mass ratio of 3:2:5 and mixed. The mixture is then ultrasonically dispersed for 4 hours, and finally filtered and dried to obtain the pigments and fillers.

[0033] The preparation steps of the long-lasting coating for electrical equipment of offshore wind power platforms in this embodiment are as follows: Add 0.5g dispersant 5040, 0.5g 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 0.1g polysiloxane-polyether copolymer, and 0.5g ethylene glycol to 20g deionized water. Then add 30g pigment and filler composite material and stir at 1800r / min to disperse evenly. Reduce the speed to 600r / min, and add 0.5g 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 0.1g polysiloxane-polyether copolymer, and 0.5g ethylene glycol. Then add 65g water-based acrylic resin and mix thoroughly to obtain a white coating, which is a long-lasting coating for electrical equipment of offshore wind power platforms.

[0034] A coating was obtained by spraying white paint onto rubber, with an average thickness of 88.7 μm. Example

[0035] This embodiment provides a long-lasting coating for electrical equipment of offshore wind power platforms, comprising the following raw materials by weight: 75g water-based acrylic resin, 40g pigments and fillers, 1.5g antioxidant, 0.3g defoamer, 2g diluent, 0.6g dispersant, 25g deionized water; The preparation method of waterborne acrylic resin is as follows: 7g styrene, 35g methyl methacrylate, 10g butyl acrylate, and 23g glycidyl methacrylate are mixed, and approximately 2.25g emulsifier (calculated as 3% of the total monomer mass) and 35g deionized water are added. The mixture is pre-emulsified for 30-45 minutes by high-speed stirring (1200-1500 rpm) to form a stable monomer emulsion. Subsequently, under continuous nitrogen protection, 85g deionized water, approximately 10-15% of the pre-emulsion (7.5-11.3g), and a portion of the initiator solution (approximately 10% of a 10% solution prepared by dissolving 0.45g ammonium persulfate in 4.5g water) are added to the reactor. The temperature is slowly raised to 80℃ and maintained for 20-30 minutes to form a seed emulsion. Subsequently, under constant temperature conditions of 80-85℃, the remaining pre-emulsion and the remaining initiator solution were added dropwise simultaneously and at a uniform rate over 3 hours (the initiator solution could be added slightly later than the monomer). After the addition was completed, the reaction was maintained at this temperature for another hour. The system was then heated to 85-90℃ and allowed to mature for 0.5 hours. After the reaction was complete, the emulsion was cooled to 40-50℃, and the pH was adjusted to 7-8 with a 10% (w / w) ammonia solution. Finally, it was filtered through a 200-mesh sieve to obtain a stable aqueous acrylate emulsion. Among them, the antioxidant is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, the defoamer is polysiloxane-polyether copolymer, the diluent is ethylene glycol, and the dispersant is dispersant 5040; The preparation method of pigments and fillers is as follows: rutile titanium dioxide, talc powder, nano-alumina powder, nano-zirconia, and nano-silica are mixed in anhydrous ethanol solvent at a mass ratio of 3:2:3:1:1, ultrasonically dispersed for 4 hours, and then filtered and dried to obtain pigments and fillers.

[0036] The preparation steps of the long-lasting coating for electrical equipment of offshore wind power platforms in this embodiment are as follows: Add 0.6g of dispersant 5040, 0.75g of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 0.15g of polysiloxane-polyether copolymer, and 1g of ethylene glycol to 25g of deionized water. Then add 15g of pigment and filler composite material and disperse the composite material evenly at a speed of 1800r / min. Reduce the speed to 600r / min, and add 0.75g of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 0.15g of polysiloxane-polyether copolymer, and 1g of ethylene glycol. Then add 40g of water-based acrylic resin and mix thoroughly to obtain a white coating, which is a long-lasting coating for electrical equipment of offshore wind power platforms.

[0037] A coating was obtained by spraying white paint onto the rubber (sealant), with an average thickness of 95.9 μm. Example

[0038] Unlike Example 1, the long-lasting coating for the electrical equipment of the offshore wind power platform described in this example is a commercially available water-based acrylic anti-corrosion coating.

[0039] In the above embodiments, before spraying the coating, the rubber material is first cleaned with soapy water or a special cleaner to remove dust, grease, dirt, and wax residue. After drying, it is lightly sanded smooth with 400-grit sandpaper. Then, it is sprayed in a well-ventilated, dust-free, and safe place using a spray gun. After the coating hardens, it forms a coating layer.

[0040] When spraying, general operating procedures must be followed to ensure coating quality: Before application, shake the paint thoroughly to ensure uniformity. For the first application or after prolonged storage, test spray onto waste paper to ensure stable atomization. Before use, adjust the viscosity with the matching thinner according to the product instructions (it is recommended to use a Forecast-4 cup for measurement, controlling it within 20-30 seconds), and connect the air source to adjust the air pressure (1.5-3 bar), spray width, and paint output. After confirming uniform atomization through test spraying, proceed with formal spraying. After application, allow the paint surface to dry naturally in a dust-free and ventilated environment. Once the paint film is surface dry, remove any masking materials promptly and immediately and thoroughly clean the spraying tools (canned paint should be inverted for cleaning, and all parts of the spray gun should be cleaned with the matching solvent). Finally, polishing can be performed after the paint surface has completely hardened.

[0041] The coatings prepared in the above examples were subjected to color difference analysis (ASTM D2244), with uncoated seals serving as blanks.

[0042] Measurement points: Five different locations for each sample, each measured three times and the average value was taken; Principle: ΔL (brightness change), Δa (red-green axis change), Δb (yellow-blue axis change); .

[0043] The results are as follows Figure 1 As shown, Figure 1 The results show that as UV exposure time increases, ΔE becomes larger and the color difference becomes more pronounced, indicating increasingly severe corrosion. Under simultaneous salt spray and UV corrosion, corrosion is more severe than with a single variable; the synergistic effect of UV and salt spray accelerates color change and makes corrosion more obvious. Furthermore, as time increases, the difference between the two curves widens. Seals coated with long-lasting paint show less color difference than uncoated seals, indicating that the prepared long-lasting paint is more effective at preventing aging and provides better protection. The long-lasting paint effectively blocks UV and salt spray erosion of the seals and inhibits color change. Conversely, the ΔE of the original seal material increases sharply, showing the greatest color difference, indicating that under long-term salt spray conditions, the color stability of the uncoated seals deteriorates completely, and corrosion and aging intensify.

[0044] Simultaneously, the long-lasting coating prepared in the examples was subjected to Fourier transform infrared absorption spectroscopy (FTIR) analysis. The results showed that the above samples exhibited absorption of mid-infrared light (4000-400 cm⁻¹). -1 The characteristic absorption of the coating was analyzed to differentiate the chemical structures of the coating and the rubber substrate. Results are shown in […]. Figure 2 .

[0045] Figure 2 This indicates that the prepared long-lasting coating has excellent resistance to UV corrosion; after 7 days of UV corrosion, the infrared absorption spectrum showed no significant difference. Figure 2 It can be seen that 2800-3000cm -1 The absorption peak at 1728 cm⁻¹ represents the asymmetric vibrational absorption of the C-H bonds of methyl and methylene groups. -1 The peak at 1408 cm⁻¹ is the absorption peak of the ester group in acrylic resin. -1 The point is the symmetric bending vibration of the methyl group, 1276 cm⁻¹ -1 1123cm -1 and 1076cm -1 It is the absorption peak of the CO stretching vibration in the ester group, 868 cm⁻¹ -1 It is the absorption peak of the epoxy group, 700-740 cm⁻¹ -1 The range is the vibration of metal oxides (MO) in the raw materials. Therefore, it can be determined that the characteristic peaks of several monomers are all present in the infrared spectrum of the long-lasting coating.

[0046] Finally, the long-lasting coating obtained above was analyzed by electrochemical impedance spectroscopy using an electrochemical workstation.

[0047] Nyquist plot: Plotted with -Z'' as the vertical axis and Z' as the horizontal axis. Each frequency point corresponds to a point on the plot. Typical graphs are semicircles, straight lines, or combinations thereof. The diameter of the semicircle often corresponds to the charge transfer resistance, and the frequency range in which the semicircle appears is related to the relaxation time of the process.

[0048] Figure 3 This is the electrochemical impedance spectroscopy (EIS) spectrum of the long-lasting coating. Figure 3 The study clearly demonstrates the significant improvement in the corrosion resistance of seals achieved by applying anti-corrosion coatings. Seals without the long-lasting coating exhibit low impedance, making charge transfer more likely and increasing metal corrosion. Seals coated (Example 1) show a distinct capacitive arc in the high-frequency region, with a significantly larger radius than those without the coating, indicating a substantial increase in impedance. This is because the coating reduces the electrode reaction rate and, by increasing charge transfer resistance, effectively hinders direct contact between the corrosive medium and the substrate, thus enhancing corrosion resistance.

[0049] from Figure 3 It can be seen from the data that the electrochemical impedance Nyquist plot of the long-lasting coating in the simulated marine atmospheric environment contains only one time constant, therefore, the following approach is adopted. Figure 4 The equivalent circuit diagram shown is fitted to represent an equivalent circuit in parallel between the coated capacitor (CPE) and the coated resistor (Rct), where Rs is the electrolyte resistor. The fitted data are shown in Table 1.

[0050] Table 1. Corrosion equivalent circuit fitting data of long-lasting coatings in simulated marine atmospheric environment. As can be seen from the data in Table 1, the solution resistance (Rs) of the sealant coated with long-lasting coating is as high as 65442 Ω·cm. 2 The value was significantly higher than that of the uncoated sample (68.07 Ω·cm). 2 This indicates that the coating effectively hinders the migration of ions in the corrosive medium, forming an excellent physical barrier. Simultaneously, the constant-phase element capacitance (CPE-T) of the coated sample decreased (from 7.9222E-5 F / cm²). 2 Reduced to 2.73EF / cm 2 This indicates that the coating isolates the metal / solution interface, significantly inhibiting the formation of the interfacial electric double layer, thereby directly hindering the corrosion reaction. Furthermore, the CPE index (CPE-P) value of the coated sample (0.65897) is closer to the ideal capacitance value of 1, reflecting that the coating improves the homogeneity of the electrode interface, helping to reduce the risk of localized corrosion hotspots and mitigate the impact of surface defects. More importantly, the charge transfer resistance (Rct) of the coated sample is significantly improved (from 6007 Ω·cm). 2 Increased to 86153 Ω·cm 2 This indicates that the coating effectively inhibits the charge transfer step in the electrochemical corrosion process. In summary, the long-lasting coating exhibits excellent physical shielding and electrochemical corrosion inhibition capabilities in a simulated marine atmospheric environment, significantly improving corrosion resistance.

[0051] Figure 5The XRD patterns of the pigments and fillers are shown. Detailed analysis of the XRD patterns reveals that rutile titanium dioxide (PDF#46-1237) exhibits a sharp and strong diffraction peak at 27.4°, along with clear secondary diffraction peaks near 36.1° and 41.2°. These sharp peaks and high intensity clearly indicate good crystal integrity. Talc (PDF#11-0273) shows characteristic diffraction peaks at 12.1° and 24.3°, and its unique peak position combination is highly consistent with its typical layered crystal structure. Nano-alumina (PDF#47-1292) exhibits broadened and weaker diffraction peaks near 35.3° and 37.9°, a morphology that directly reflects the size effect caused by its nanoscale grains. Nano-zirconia (PDF#37-1484) exhibits a broad but low-intensity diffraction signal near 30.2°, reflecting the unique structural characteristics of its nanoparticles and suggesting that the material may exist in a stable tetragonal phase. Nano-silica (PDF#50-1694) displays a broad, diffuse diffraction peak near 22°, clearly indicating its amorphous structural properties. The high intensity and sharp peaks of rutile titanium dioxide and talc indicate that they are present in high concentrations and have good crystallinity in the system; while the broad peaks of nano-alumina and zirconia, and the amorphous diffuse peaks of silica, aptly reflect the size effect and structural characteristics unique to nanomaterials.

[0052] Figure 6 The images show the SEM and EDS spectra of the pigments and fillers. Figure 6 (a)-(c) show that the filler exhibits a multiphase composite microstructure with a wide particle size distribution. Rutile titanium dioxide is dispersed as irregular blocky or columnar particles with a relatively smooth surface, while talc displays a typical layered structure with thin, rolled edges. Nanoscale alumina, zirconium oxide, and silica particles adhere to the matrix or large particle surfaces as small dots or spheres, forming a nano- to micron-scale composite structure. The overall system has good density, and the interparticle interfaces are clearly defined. Figure 6 In (d) and (e), the element mapping visually presents the distribution characteristics of each major component: titanium corresponds to rutile titanium dioxide with regional agglomeration distribution, silicon dioxide and aluminum alumina are mostly distributed uniformly in the field of view in a diffuse manner, and zirconium oxide is interspersed in the form of isolated small dots. The distribution of each element is consistent with the SEM morphology observation results, confirming the synergistic existence and composite morphology of rutile titanium dioxide, talc, nano-sized alumina, zirconium oxide and silicon dioxide in the filler system.

Claims

1. A long-lasting coating for electrical equipment of offshore wind power platforms, characterized in that, Including the following parts by weight of raw materials: 45-75 parts of high molecular functional resin; 20-40 parts of pigments and fillers; Dispersant 0.5~0.7 parts 2.2-5.5 parts of auxiliary agents; 20-25 parts deionized water; Among them, functional polymer resins include waterborne acrylic resins; The pigments and fillers include titanium dioxide, talc, and nano-oxides.

2. The long-lasting coating for electrical equipment of offshore wind power platforms according to claim 1, characterized in that, The preparation of the waterborne acrylic resin includes the following raw materials in parts by weight: 5-8 parts styrene, 25-35 parts methyl methacrylate, 7-10 parts butyl acrylate and 18-25 parts glycidyl methacrylate.

3. The long-lasting coating for electrical equipment of offshore wind power platforms according to claim 1 or 2, characterized in that, Styrene, methyl methacrylate, butyl acrylate, glycidyl methacrylate and emulsifier are mixed and polymerized under the action of an initiator to obtain the waterborne acrylic resin.

4. The long-lasting coating for electrical equipment of offshore wind power platforms according to claim 1, characterized in that, The titanium dioxide is rutile titanium dioxide; and / or, the nano-oxide includes one or more of nano-alumina, nano-zirconia, and nano-silica.

5. The long-lasting coating for electrical equipment of offshore wind power platforms according to claim 1, characterized in that, The additives comprise the following components in parts by weight: 1-3 parts antioxidant; 0.2-0.5 parts defoamer; and 1-2 parts diluent.

6. The long-lasting coating for electrical equipment of offshore wind power platforms according to claim 1, characterized in that, The mass ratio of titanium dioxide, talc and nano-oxide in the pigments and fillers is 3:(1.5-2.5):(4-6).

7. The long-lasting coating for electrical equipment of offshore wind power platforms according to claim 5, characterized in that, The defoamer is a polysiloxane-polyether copolymer; and / or, the antioxidant is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole.

8. The long-lasting coating for electrical equipment of offshore wind power platforms according to claim 1, characterized in that, Titanium dioxide, talc, and nano-oxides are added to a solvent, ultrasonically dispersed, and then dried to obtain the pigments and fillers.

9. A method for preparing a long-lasting coating for electrical equipment of offshore wind power platforms according to any one of claims 1-8, characterized in that, include: Add dispersant and half the weight of additives to deionized water and stir. Then add pigments and fillers and disperse them evenly at a speed of 1500-2500 r / min. Reduce the speed to 500-1000 r / min, add the other half the weight of additives, and then add polymer functional resin. Stir and mix to obtain the long-lasting coating for electrical equipment of offshore wind power platforms.

10. The application of the long-lasting coating for offshore wind power platform electrical equipment as described in any one of claims 1-8 in the rubber seals of offshore wind power platform electrical equipment.

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