Anti-corrosion coating composition, anti-corrosion coating, preparation method of anti-corrosion coating and coating

Abstract

The invention provides an anti-corrosion coating composition, an anti-corrosion coating, a preparation method of the anti-corrosion coating and a coating. The anti-corrosion coating composition comprises thermosetting resin, a curing agent and modified waste wind turbine blade powder, wherein based on the total mass of the thermosetting resin and the curing agent, the addition amount of the modified waste wind turbine blade powder is 10-30%; the anti-corrosion coating is obtained by mixing the anti-corrosion coating composition with a solvent and an auxiliary agent. The method provided by the invention comprises the following steps: (1) adding a solvent, a dispersing agent, a defoaming agent and thermosetting resin into a stirring kettle, and dispersing to form a mixed solution Y-1; (2) adding modified waste wind turbine blade powder into the mixed solution Y-1 to form a mixed solution Y-2; and (3) adding a curing agent and a rheological additive into the mixed solution Y-2 to obtain the anticorrosive paint. The invention provides an anticorrosive coating formed by the anticorrosive paint. According to the anticorrosive paint composition disclosed by the invention, alkali treatment and silane treatment are carried out on the wind power blade, so that the compatibility of wind power blade powder and resin is improved, and the corrosivity of a coating is improved.

Description

Technical Field

[0001] This invention relates to the technical field of coatings, specifically to an anti-corrosion coating composition, an anti-corrosion coating, a method for preparing the same, and a coating layer. Background Technology

[0002] Wind turbine blades are composite materials, primarily composed of thermosetting resins and fibers. After curing and cross-linking, they form an insoluble and infusible solid. Thermosetting resins used are typically epoxy resins, unsaturated polyester resins, and polyurethane resins, while the fibers are generally glass fibers and carbon fibers. Once wind turbine blade materials reach the end of their lifespan, they become solid waste and can only be disposed of through landfill or incineration. These methods are gradually being prohibited by law, therefore, better solutions are needed to address the large amount of waste wind turbine blades.

[0003] Grinding wind turbine blades into powder and utilizing them is one method of wind turbine blade recycling. Patent CN115465867B pulverizes waste wind turbine blades to a particle size of ≤80 mesh to prepare precipitated silica; Patent CN117341250A grinds waste wind turbine blades into fiberglass (resin) powder with a particle size of 0.15 mm for use as a plastic filler.

[0004] The preparation of silica (white carbon black) in patent CN115465867B requires a high-temperature environment, and the glass fiber used in most wind turbine blades is alkali-resistant glass fiber, which is not easily dissolved into silica sol, making the preparation of silica difficult. The fiberglass powder obtained in patent CN117341250A is a thermosetting resin powder, which exhibits incompatibility when added to thermoplastic plastics, leading to deterioration of plastic properties and poor performance.

[0005] Wind turbine blade powder is a thermosetting resin. Adding it to anti-corrosion coatings made of thermosetting resins can not only improve the anti-corrosion performance of the coating, but also improve the interfacial properties after surface treatment. This is a way to make high-value use of wind turbine blade powder.

[0006] An investigation of existing literature and patents revealed few reports on using wind turbine blade powder as an additive for thermosetting coatings. CN118580741A discloses an anti-corrosion coating and its preparation method, which involves: (1) modifying wind turbine blade powder with an organic solvent to separate solid components, drying and photodegrading the solid components sequentially to obtain component A; (2) mixing a base resin, conductive filler, inorganic filler, and hydrochloric acid corrosion inhibitor and filtering the mixture to obtain component B; (3) mixing a base resin, polyamide curing agent, titanate coupling agent, and silicone resin binder, filtering the mixture to obtain component C; and (4) mixing component A, component B, and component C in a third process. The base resin contains coal-based resin, epoxy resin, and petroleum resin. However, this method requires photodegradation of the blade powder before use, the degradation conditions are difficult to control, and multiple fillers need to be used in combination. Summary of the Invention

[0007] To address the aforementioned problems, the present invention aims to provide an anti-corrosion coating composition and coating made from recycled wind turbine blade powder. By processing the wind turbine blade and dispersing it fully in a thermosetting resin, an anti-corrosion coating with high resistance can be formed. The preparation process is simple, and the functionality of the wind turbine blade powder can be fully utilized, resulting in high added value.

[0008] To achieve the objectives of this invention, the following technical solution is adopted: The present invention provides an anti-corrosion coating composition in a first aspect, the anti-corrosion coating composition comprising a thermosetting resin, a curing agent, and modified waste wind turbine blade powder; The modified waste wind turbine blade powder is added at a rate of 10% to 30%, preferably 20% to 30%, based on the total mass of the thermosetting resin and curing agent.

[0009] In some embodiments, the mass ratio of the modified waste wind turbine blade powder to the thermosetting resin is (0.1~0.5):1.

[0010] In some embodiments, the thermosetting resin is selected from polyurethane resin, epoxy resin or fluorocarbon resin, preferably epoxy resin; The curing agent is selected from organic amine curing agents or isocyanate curing agents.

[0011] In some embodiments, the modified waste wind turbine blade powder is prepared as follows: (1) Grind the fiber-reinforced composite material in the recovered wind turbine blades to obtain waste wind turbine blade powder, preferably grinding it to 20~50 micrometers; (2) Add alkaline solution to the waste wind turbine blade powder obtained in step (1) and stir under heating. Then wash with water until neutral, filter, and dry to constant weight. (3) Mix silane coupling agent, ethanol and deionized water in a mass ratio of 1: (3~6): (3~6), and adjust the pH value to 4~5 to prepare silane coupling agent hydrolysate; The product obtained in step (2) was added to the silane coupling agent hydrolysate at a weight ratio of 1:(10~20) and reacted at 60~80℃ for 2~4 h. The product was then washed with water until neutral, filtered, and dried to constant weight to obtain modified waste wind turbine blade powder.

[0012] In some embodiments, in step (2) of the above preparation method, the waste wind turbine blade powder is mixed with alkaline solution and stirred at 80~90℃ for 6~12 h; Preferably, the solid-liquid ratio of the waste wind turbine blade powder to the alkaline solution is (1~10):(1~40) g / ml; More preferably, the mass concentration of the alkaline solution is 10% to 20%.

[0013] In some embodiments, in step (3) of the above preparation method, the silane coupling agent is selected from γ-glycidoxypropyltrimethoxysilane or perfluorodecyltriethoxysilane.

[0014] In a second aspect, the present invention provides an anti-corrosion coating, wherein the anti-corrosion coating is obtained by uniformly mixing each component of the above-mentioned anti-corrosion coating composition with a solvent and other additives; The solvent is selected from one or more of ethanol, ethyl acetate, butyl acetate or n-butanol; The other additives are selected from dispersants, defoamers, and rheology modifiers; Preferably, the amount of dispersant, by mass, is 5% to 10% of the amount of modified waste wind turbine blade powder added to the anti-corrosion coating composition.

[0015] In some embodiments, the dispersant is selected from sterically hindered dispersants, specifically BYK-110 and BYK-9076, preferably BYK-9076; The defoamer is selected from silicone defoamers, specifically BYK-066N and BYK-141, preferably BYK-141; The rheology modifier is selected from BYK-410 and BYK GARMITE 1958, with BYK-410 being preferred.

[0016] In a third aspect, the present invention provides a method for preparing the above-mentioned anti-corrosion coating, comprising the following steps: (1) Add solvent, dispersant, defoamer and thermosetting resin to the stirred tank, and use a high-speed disperser to dissolve them evenly to form a mixture Y-1; (2) Add modified waste wind turbine blade powder to the mixture Y-1 and stir at high speed until uniform to form mixture Y-2; (3) Add curing agent and rheology modifier to the mixture Y-2 and mix evenly to obtain anti-corrosion coating; Among them, each component in steps (1) to (3) satisfies the above-mentioned dosage ratio.

[0017] The present invention provides a fourth aspect of an anti-corrosion coating, said anti-corrosion coating being formed from the anti-corrosion coating of any one of claims 7 or 8.

[0018] The technical solution provided by this invention has the following beneficial effects: The anti-corrosion coating composition provided by the present invention improves the compatibility between wind turbine blade powder and thermosetting resin by subjecting wind turbine blades to alkali treatment and silane treatment, fully leveraging the shielding effect and high impedance effect of wind turbine blade powder, and improving the corrosion resistance of the coating.

[0019] Compared to other types of anti-corrosion fillers, the anti-corrosion coating provided by this invention has a circular economy effect, making full use of the functional value of the wind turbine blade material itself, and its value is obvious compared to other wind turbine blade powder reuse schemes. Detailed Implementation

[0020] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The term "and / or" may be used herein to include any and all combinations of one or more of the associated listed items.

[0022] The present invention provides an anti-corrosion coating composition in a first aspect, the anti-corrosion coating composition comprising a thermosetting resin, a curing agent, and modified waste wind turbine blade powder; The modified waste wind turbine blade powder is added at a rate of 10% to 30%, for example, 12%, 15%, or 18%, based on the total mass of the thermosetting resin and curing agent; preferably 20% to 30%, for example, 22%, 25%, or 28%.

[0023] In some embodiments, the mass ratio of the modified waste wind turbine blade powder to the thermosetting resin is (0.1~0.5):1, for example, 0.2:1, 0.3:1, 0.4:1.

[0024] In some embodiments, the thermosetting resin is selected from polyurethane resin, epoxy resin or fluorocarbon resin, preferably epoxy resin; the curing agent is selected from organic amine curing agents or isocyanate curing agents.

[0025] In some embodiments, the modified waste wind turbine blade powder is prepared as follows: (1) Grind the fiber-reinforced composite material in the recovered wind turbine blades to obtain waste wind turbine blade powder, preferably grinding it to a D50 of 20~50 micrometers; (2) Add alkaline solution to the waste wind turbine blade powder obtained in step (1) and stir under heating. Then wash with water until neutral, filter, and dry to constant weight. (3) Mix silane coupling agent, ethanol and deionized water in a mass ratio of 1: (3~6): (3~6), and adjust the pH value to 4~5 to prepare silane coupling agent hydrolysate; The product obtained in step (2) was added to the silane coupling agent hydrolysate at a weight ratio of 1:(10-20) and reacted at 60-80°C for 2-4 h. The product was then washed with water until neutral, filtered, and dried to constant weight to obtain modified waste wind turbine blade powder.

[0026] In some specific implementations, in step (2), the waste wind turbine blade powder is mixed with alkaline solution and stirred at 80~90℃ for 6~12 h. Preferably, the solid-liquid ratio of the waste wind turbine blade powder to the alkaline solution is (1~10):(1~40) g / ml, for example, 2:10 g / ml, 3:15 g / ml, 4:20 g / ml, 4:30 g / ml.

[0027] More preferably, the mass concentration of the alkaline solution is 10% to 20%, for example, 12%, 15%, or 18%.

[0028] In some specific embodiments, the silane coupling agent in step (3) is selected from γ-glycidoxypropyltrimethoxysilane (KH-560) or perfluorodecyltriethoxysilane (PFDTES).

[0029] In a second aspect, the present invention provides an anti-corrosion coating, wherein the anti-corrosion coating is obtained by uniformly mixing each component of the above-mentioned anti-corrosion coating composition with a solvent and other additives; The solvent is selected from one or more of ethanol, ethyl acetate, butyl acetate or n-butanol; The other additives are selected from dispersants, defoamers, and rheology modifiers; Preferably, the amount of dispersant used, by mass, is 5%-10% of the amount of modified waste wind turbine blade powder added to the anti-corrosion coating composition.

[0030] In some specific embodiments, the dispersant is selected from sterically hindered dispersants, specifically BYK-110 and BYK-9076 from BYK Chemicals, Germany, with BYK-9076 being preferred. The defoamer is selected from silicone defoamers, and can be selected from BYK-066N and BYK-141 of BYK Chemicals in Germany, with BYK-141 of BYK Chemicals in Germany being preferred. The rheology modifier can be selected from BYK-410 and BYK GARMITE1958 from BYK Chemicals, Germany, and is preferably BYK-410 from BYK Chemicals, Germany.

[0031] In a third aspect, this invention provides a method for preparing an anti-corrosion coating, comprising the following steps: (1) Add solvent, dispersant, defoamer and thermosetting resin to the stirred tank, and use a high-speed disperser to dissolve them evenly to form a mixture Y-1; (2) Add modified waste wind turbine blade powder to the mixture Y-1 and stir at high speed until uniform to form mixture Y-2; (3) Add curing agent and rheology modifier to the mixture Y-2 and mix evenly to obtain anti-corrosion coating; Among them, each component in steps (1) to (3) satisfies the above-mentioned dosage ratio.

[0032] In a fourth aspect, the present invention provides an anti-corrosion coating formed from the aforementioned anti-corrosion paint.

[0033] In some specific embodiments, the above-mentioned coating is applied to the substrate by spraying or spin coating, and then dried at room temperature to obtain an anti-corrosion coating; specifically, the substrate can be glass, aluminum sheet, carbon steel sheet, etc.

[0034] In some implementations, the superhydrophobic coating is obtained by drying the coated paint at room temperature for 24 hours.

[0035] The present invention will be further illustrated below with specific examples, but it should not be construed as the present invention being limited to these examples.

[0036] Where specific experimental steps or conditions are not specified in the examples, they can be performed according to the corresponding conventional experimental steps or conditions in this technical field. Reagents whose manufacturers are not specified are all conventional reagents already available in this field.

[0037] The coating performance was tested using the following test methods: 1. Impedance: AC impedance was tested using an electrochemical workstation to measure the impedance of a 100μm coating at 0.01Hz. 2. Circuit density: Corrosion current was obtained by Tafel testing using an electrochemical workstation; 3. Water absorption rate: The coating is prepared into a 10 mm × 10 mm × 2 mm film. After curing at 23℃ for 72 h, the coating is immersed in 3.5% salt water and the water absorption rate after immersion for 15 days is tested to characterize its ability to resist cut-off penetration. 4. Adhesion: Refer to standard GB / T 5210-2006, the substrate is sandblasted carbon steel plate.

[0038] The raw materials used in the examples of this invention are sourced from: Epoxy resin: The epoxy resin selected is from Bluestar Chemical, brand name E-51; Fluorocarbon resin: Zhonghao Chemical's FEVE fluorocarbon resin, brand name JX-2, was selected; Organic amine curing agent: Cardelliamine curing agent, brand name NX-2003D, was selected; Isocyanate curing agent: Bayer N3390 (Germany); Rheology modifier: BYK410 from BYK Chemicals, Germany; Dispersant: BYK9076 from BYK Chemicals, Germany; Wind turbine blades: The discarded wind turbine blades come from Longyuan Power and are made of glass fiber reinforced epoxy composite material. The blades are obtained by crushing and screening by Guoneng (Shandong) Energy and Environment Co., Ltd.

[0039] Example 1 The preparation method of modified waste wind turbine blade powder is as follows: (1) Grind and sieve the fiber-reinforced composite material in the recovered wind turbine blades to screen out waste wind turbine blade powder with a D50 of 50 micrometers; (2) Add 10g of waste wind turbine blade powder to 200g of 20% NaOH aqueous solution, and stir and react at 80℃ for 6h. Then wash with water until neutral, filter, and dry to constant weight. (3) Mix 20g of perfluorodecyltriethoxysilane, 60g of ethanol and 120g of deionized water, and adjust the pH value to 4-5 with acetic acid to prepare silane coupling hydrolysate; Take 10g of the product from step (2) and add it to 200g of silane coupling hydrolysate. React at 60℃ for 2 h, then wash with water until neutral, filter, and dry to constant weight to obtain modified waste wind turbine blade powder.

[0040] Prepare the anti-corrosion coating according to the following method (specific proportions are shown in Table 1 below): (1) Add ethyl acetate, dispersant BYK9076, defoamer BYK141 and epoxy resin to the stirred tank in proportion, and dissolve them evenly using a high-speed disperser to form a mixture Y-1; (2) Add the modified waste wind turbine blade powder prepared above to the mixture Y-1 and stir at high speed until uniform to form mixture Y-2; (3) Add cardellamine curing agent (brand name NX-2003D) and rheology modifier BYK410 to the mixture Y-2 and mix evenly to obtain anti-corrosion coating.

[0041] Example 2 The preparation method of modified waste wind turbine blade powder is as follows: (1) Grind and sieve the fiber-reinforced composite material in the recovered wind turbine blades to screen out waste wind turbine blade powder with a D50 of 50 micrometers; (2) Add 10g of waste wind turbine blade powder to 200g of 20% NaOH aqueous solution, and stir and react at 80℃ for 6h. Then wash with water until neutral, filter, and dry to constant weight. (3) Mix 20g of perfluorodecyltriethoxysilane, 60g of ethanol and 120g of deionized water, and adjust the pH value to 4-5 with acetic acid to prepare silane coupling hydrolysate; Take 10g of the product from step (2) and add it to 100g of silane coupling hydrolysate. React at 60℃ for 2 h, then wash with water until neutral, filter, and dry to constant weight to obtain modified waste wind turbine blade powder.

[0042] The anti-corrosion coating was prepared according to the method described in Example 1 (specific proportions are shown in Table 1 below): (1) Add ethyl acetate, dispersant BYK9076, defoamer BYK141 and epoxy resin E51 to the stirred tank in proportion, and dissolve them evenly using a high-speed disperser to form a mixture Y-1; (2) Add the modified waste wind turbine blade powder prepared above to the mixture Y-1 and stir at high speed until uniform to form mixture Y-2; (3) Add cardellamide curing agent NX-2003D and rheology modifier BYK410 to the mixture Y-2 and mix evenly to obtain an anti-corrosion coating.

[0043] Example 3 The preparation method of modified waste wind turbine blade powder is as follows: (1) Grind and sieve the fiber-reinforced composite material in the recovered wind turbine blades to screen out waste wind turbine blade powder with a D50 of 50 micrometers; (2) Add 10g of waste wind turbine blade powder to 200g of 20% NaOH aqueous solution, and stir and react at 80℃ for 6h. Then wash with water until neutral, filter, and dry to constant weight. (3) Mix 20g of perfluorodecyltriethoxysilane, 60g of ethanol and 120g of deionized water, and adjust the pH value to 4-5 with acetic acid to prepare silane coupling hydrolysate; Take 10g of the product from step (2) and add it to 150g of silane coupling hydrolysate. React at 60℃ for 2 h, then wash with water until neutral, filter, and dry to constant weight to obtain modified waste wind turbine blade powder.

[0044] The anti-corrosion coating was prepared according to the method described in Example 1 (specific proportions are shown in Table 1 below): (1) Add ethyl acetate, dispersant BYK9076, defoamer BYK141 and epoxy resin E51 to the stirred tank in proportion, and dissolve them evenly using a high-speed disperser to form a mixture Y-1; (2) Add the modified waste wind turbine blade powder prepared above to the mixture Y-1 and stir at high speed until uniform to form mixture Y-2; (3) Add cardellamide curing agent NX-2003D and rheology modifier BYK410 to the mixture Y-2 and mix evenly to obtain an anti-corrosion coating.

[0045] Example 4 The preparation method of modified waste wind turbine blade powder is as follows: (1) Grind and sieve the fiber-reinforced composite material in the recovered wind turbine blades to screen out waste wind turbine blade powder with a D50 of about 50 micrometers; (2) Add 10g of waste wind turbine blade powder to 200g of 20% NaOH aqueous solution, and stir and react at 80℃ for 6h. Then wash with water until neutral, filter, and dry to constant weight. (3) Mix 20g of perfluorodecyltriethoxysilane, 60g of ethanol and 120g of deionized water, and adjust the pH value to 4-5 with acetic acid to prepare silane coupling hydrolysate; Take 10g of the product from step (2) and add it to 200g of silane coupling hydrolysate. React at 60℃ for 2 h, then wash with water until neutral, filter, and dry to constant weight to obtain modified waste wind turbine blade powder.

[0046] The anti-corrosion coating was prepared according to the method described in Example 1 (the specific formulation is shown in Table 1 below): (1) Add ethyl acetate, dispersant BYK9076, defoamer BYK141 and fluorocarbon resin (Zhonghao Chemical FEVE fluorocarbon resin, JX-2, solid content 50%) to the stirred tank in proportion, and dissolve them evenly to form a mixture Y-1 using a high-speed disperser; (2) Add the modified waste wind turbine blade powder prepared above to the mixture Y-1 and stir at high speed until uniform to form mixture Y-2; (3) Add isocyanate curing agent (Bayer N3390, Germany) and rheology modifier BYK410 to the mixture Y-2 and mix evenly to obtain the anti-corrosion coating.

[0047] Comparative Example 1 The anti-corrosion coating was prepared according to the method described in Example 1 (the specific formulation is shown in Table 1 below): (1) Add ethyl acetate, dispersant BYK9076, defoamer BYK141 and epoxy resin E51 to the stirred tank in proportion, and dissolve them evenly using a high-speed disperser to form a mixture Y-1; (2) Add cardellamide curing agent NX-2003D and rheology modifier BYK410 to the mixture Y-1 and mix evenly to obtain an anti-corrosion coating.

[0048] Comparative Example 2 The preparation method of modified waste wind turbine blade powder is as follows: (1) Grind and sieve the fiber-reinforced composite material in the recovered wind turbine blades to screen out waste wind turbine blade powder with a D50 of 50 micrometers; (2) Add 10g of waste wind turbine blade powder to 200g of 20% NaOH aqueous solution, and stir and react at 80℃ for 6h. Then wash with water until neutral, filter, and dry to constant weight. (3) Mix 20g of perfluorodecyltriethoxysilane, 60g of ethanol and 120g of deionized water, and adjust the pH value to 4-5 with acetic acid to prepare silane coupling hydrolysate; Take 10g of the product from step (2) and add it to 200g of silane coupling hydrolysate. React at 60℃ for 2 h, then wash with water until neutral, filter, and dry to constant weight to obtain modified waste wind turbine blade powder.

[0049] The anti-corrosion coating was prepared according to the method described in Example 1 (the specific formulation is shown in Table 1 below): (1) Add ethyl acetate, dispersant BYK9076, defoamer BYK141 and epoxy resin E51 to the stirred tank in proportion, and dissolve them evenly using a high-speed disperser to form a mixture Y-1; (2) Add the modified waste wind turbine blade powder prepared above to the mixture Y-1 and stir at high speed until uniform to form mixture Y-2; (3) Add cardellamide curing agent NX-2003D and rheology modifier BYK410 to the mixture Y-2 and mix evenly to obtain an anti-corrosion coating.

[0050] Comparative Example 3 The preparation method of modified waste wind turbine blade powder is as follows: (1) Grind and sieve the fiber-reinforced composite material in the recovered wind turbine blades to obtain waste wind turbine blade powder with a D50 of about 50 micrometers. (2) Add 10g of waste wind turbine blade powder to 200g of 20% NaOH aqueous solution, and stir and react at 80℃ for 6h. Then wash with water until neutral, filter, and dry to constant weight. (3) Mix 20g of perfluorodecyltriethoxysilane, 60g of ethanol and 120g of deionized water, and adjust the pH value to 4-5 with acetic acid to prepare silane coupling hydrolysate; Take 10g of the product from step (2) and add it to 200g of silane coupling hydrolysate. React at 60℃ for 2 h, then wash with water until neutral, filter, and dry to constant weight to obtain modified waste wind turbine blade powder.

[0051] The anti-corrosion coating was prepared according to the method described in Example 1 (the specific formulation is shown in Table 1 below): (1) Add ethyl acetate, dispersant BYK9076, defoamer BYK141 and epoxy resin E51 to the stirred tank in proportion, and dissolve them evenly using a high-speed disperser to form a mixture Y-1; (2) Add the modified waste wind turbine blade powder prepared above to the mixture Y-1 and stir at high speed until uniform to form mixture Y-2; (3) Add cardellamide curing agent NX-2003D and rheology modifier BYK410 to the mixture Y-2 and mix evenly to obtain an anti-corrosion coating.

[0052] The amounts of each component used in the above embodiments and comparative examples are shown in Table 1 below: Table 1

[0053] Note: The data listed in the table above are the mass fractions of each component.

[0054] The coatings prepared in the above examples and comparative examples were applied to the substrate by spraying or spin coating, and dried at room temperature for 24 hours to obtain anti-corrosion coatings. The performance of each coating was tested, and the test results are shown in Table 2 below. Table 2

[0055] As shown in the table above, the coating prepared by the anti-corrosion coating composition provided by this invention, compared with the coating without modified blade powder, has higher impedance and lower current density, better shielding properties against salt water, and better adhesion to the substrate, exhibiting excellent overall performance and good anti-corrosion properties. These advantages are mainly due to the good compatibility between the modified blade and the coating resin, its hydrophobic and shielding properties, and its ability to reduce internal stress during coating curing, thus demonstrating excellent anti-corrosion performance.

[0056] In Comparative Example 1, no modified waste wind turbine blade powder was added, while in Comparative Example 2, a smaller amount of modified waste wind turbine blade powder was added. The resulting coating exhibited reduced impedance, increased current density, improved brine permeability, and decreased corrosion resistance. However, in Comparative Example 3, where excessive modified waste wind turbine blade powder was added, the coating's performance deteriorated, and its corrosion resistance decreased. This may be due to the excessive filler exceeding the coating's critical PVC level, leading to increased porosity.

Claims

1. An anti-corrosion coating composition, characterized in that, The anti-corrosion coating composition includes thermosetting resin, curing agent, and modified waste wind turbine blade powder; The modified waste wind turbine blade powder is added at a rate of 10% to 30%, preferably 20% to 30%, based on the total mass of the thermosetting resin and curing agent.

2. The anti-corrosion coating composition according to claim 1, characterized in that, The mass ratio of the modified waste wind turbine blade powder to the thermosetting resin is (0.1~0.5):

1.

3. The anti-corrosion coating composition according to claim 2, characterized in that, The thermosetting resin is selected from polyurethane resin, epoxy resin or fluorocarbon resin, preferably epoxy resin; The curing agent is selected from organic amine curing agents or isocyanate curing agents.

4. The anti-corrosion coating composition according to any one of claims 1 to 3, characterized in that, The modified waste wind turbine blade powder is prepared as follows: (1) Grind the fiber-reinforced composite material in the recovered wind turbine blades to obtain waste wind turbine blade powder, preferably to 20~50 micrometers; (2) Add alkaline solution to the waste wind turbine blade powder obtained in step (1) and stir under heating. Then wash with water until neutral, filter, and dry to constant weight. (3) Mix silane coupling agent, ethanol and deionized water in a mass ratio of 1: (3~6): (3~6), and adjust the pH value to 4~5 to prepare silane coupling agent hydrolysate; The product obtained in step (2) was added to the silane coupling agent hydrolysate at a weight ratio of 1:(10~20) and reacted at 60~80℃ for 2~4 h. The product was then washed with water until neutral, filtered, and dried to constant weight to obtain modified waste wind turbine blade powder.

5. The anti-corrosion coating composition according to claim 4, characterized in that, In step (2), the waste wind turbine blade powder is mixed with alkaline solution and stirred at 80~90℃ for 6~12 h. Preferably, the solid-liquid ratio of the waste wind turbine blade powder to the alkaline solution is (1~10):(1~40) g / ml; More preferably, the mass concentration of the alkaline solution is 10% to 20%.

6. The anti-corrosion coating composition according to claim 5, characterized in that, In step (3), the silane coupling agent is selected from γ-glycidoxypropyltrimethoxysilane or perfluorodecyltriethoxysilane.

7. An anti-corrosion coating, characterized in that, The anticorrosive coating is obtained by uniformly mixing each component of the anticorrosive coating composition according to any one of claims 1 to 6 with a solvent and other additives; The solvent is selected from one or more of ethanol, ethyl acetate, butyl acetate or n-butanol; The other additives are selected from dispersants, defoamers, and rheology modifiers; Preferably, the amount of dispersant, by mass, is 5% to 10% of the amount of modified waste wind turbine blade powder added to the anti-corrosion coating composition.

8. The anti-corrosion coating according to claim 7, characterized in that, The dispersant is selected from sterically hindered dispersants, preferably BYK9076; The defoamer is selected from silicone defoamer BYK-066N or BYK-141, preferably BYK-141; The rheology modifier is selected from BYK-410 and BYK GARMITE 1958, with BYK-410 being preferred.

9. A method for preparing the anti-corrosion coating according to claim 7 or 8, characterized in that, Includes the following steps: (1) Add solvent, dispersant, defoamer and thermosetting resin to the mixing tank, and use a high-speed disperser to dissolve them evenly to form a mixture Y-1; (2) Add modified waste wind turbine blade powder to the mixture Y-1 and stir at high speed until uniform to form mixture Y-2; (3) Add curing agent and rheology modifier to the mixture Y-2 and mix evenly to obtain anti-corrosion coating; In this process, each component in steps (1) to (3) satisfies the dosage ratio specified in claim 7.

10. An anti-corrosion coating, characterized in that, The anti-corrosion coating is formed from the anti-corrosion coating as described in any one of claims 7 or 8.

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