Anticorrosive paint for steel pipe pile and preparation method of anticorrosive paint

Abstract

The invention relates to the technical field of anticorrosive coatings, and particularly discloses an anticorrosive coating for a steel pipe pile and a preparation method thereof.Epoxy resin emulsion serves as matrix resin, a main continuous phase of a coating film is formed, and permeation of corrosive media such as moisture, oxygen and chloride ions is effectively prevented; meanwhile, the epoxy resin emulsion and the polyurethane emulsion are compounded, so that the toughness of a coating film can be improved, and the cracking resistance and deformation resistance of the coating are further improved; titanium carbide is loaded on crystalline flake graphite, so that the roughness and the stacking density of the surface of a sheet layer are increased, a coating shielding layer formed by the crystalline flake graphite and the titanium carbide is more compact, and the corrosion resistance of a coating is greatly improved; meanwhile, titanium carbide is used as a material with extremely high hardness and excellent wear resistance and is introduced to the surface of the crystalline flake graphite, so that the wear resistance of the coating is improved, and 5-formyl-2-thiophene phenylboronic acid molecules are grafted to the surface of the composite filler, so that the wear resistance and corrosion resistance of the coating are further improved.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion coating technology, specifically to an anti-corrosion coating for steel pipe piles and its preparation method. Background Technology

[0002] Steel pipe piles are widely used as important foundation load-bearing components in marine engineering, port terminals, cross-sea bridges, and infrastructure construction along rivers and coasts. These steel pipe piles operate for extended periods in harsh corrosive environments, continuously immersed in complex seawater or freshwater rich in chloride ions. Sections located in areas of fluctuating water levels and under sediment face even more severe challenges due to alternating wet and dry conditions, oxygen concentration differences, microbial activity, and impacts and abrasion from waves and floating ice. Furthermore, some pipe piles driven into the ground must resist erosion from chemicals and stray currents in the soil. This highly corrosive environment, with its multiple coupled factors, easily leads to thinning of the steel pipe pile wall and a decrease in load-bearing capacity, seriously threatening the durability and safe operating life of the overall structure. Therefore, it is essential to apply highly efficient and reliable anti-corrosion protection to them.

[0003] Currently, corrosion protection for steel pipe piles mainly relies on organic coatings. However, conventional anti-corrosion coating systems still have several significant defects in practical applications. Many coatings lack flexibility and adhesion strength, making it difficult to withstand the enormous impact and soil friction during pile driving. This can easily lead to cracking, peeling, and other damage to the coating, causing the anti-corrosion system to fail from the very beginning of installation. Furthermore, with the increasing complexity of construction environments, higher requirements are being placed on the wear resistance, corrosion resistance, weather resistance, and mechanical properties of protective coatings. Traditional anti-corrosion coatings can no longer meet these requirements.

[0004] Therefore, there is an urgent need to provide an anti-corrosion coating with good wear resistance, strong adhesion and excellent corrosion resistance to solve the technical problems existing in the prior art. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an anti-corrosion coating for steel pipe piles and its preparation method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An anti-corrosion coating for steel pipe piles, the anti-corrosion coating comprising the following raw materials in parts by weight: 60-80 parts epoxy resin emulsion, 20-30 parts polyurethane emulsion, 15-25 parts modified composite filler, 1-3 parts dispersant, 0.5-1 part leveling agent, 0.3-0.6 parts defoamer, 0.5-1 part anti-flash rust agent, 10-20 parts deionized water, and 10-15 parts curing agent.

[0007] In the technical solution disclosed in this invention, epoxy resin emulsion, as the base resin, constitutes the main continuous phase of the coating film. It adheres tightly to the surface of the steel pipe pile, forming a robust and barrier-like protective layer that effectively prevents the penetration of corrosive media such as moisture, oxygen, and chloride ions. The number of parts of the epoxy resin emulsion can be selected from 60 parts, 62 parts, 64 parts, 65 parts, 68 parts, 70 parts, 72 parts, 75 parts, 78 parts, and 80 parts, but is not limited to the listed values; other unlisted values ​​within the range are also applicable.

[0008] In the technical solution disclosed in this invention, a single epoxy resin coating is relatively brittle. By compounding epoxy resin and polyurethane, the toughness of the coating can be improved, thereby improving the crack resistance and deformation resistance of the coating. The number of parts of polyurethane emulsion can be selected as 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, or 30 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0009] In the technical solution disclosed in this invention, the number of parts of the modified composite filler can be selected as 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, or 25 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0010] In the technical solution disclosed in this invention, the preparation method of the modified composite filler is as follows: S1. Disperse flake graphite in anhydrous ethanol, then add tetrabutyl titanate solution and ammonia water, stir to react, and after the reaction is completed, filter, wash and dry to obtain titanium dioxide / flake graphite composite filler. S2. Titanium dioxide / flake graphite composite filler, glucose and citric acid are dispersed in anhydrous ethanol. After uniform dispersion, the solvent is removed, and the mixture is cured and calcined to obtain titanium carbide / flake graphite composite filler. S3. Disperse the titanium carbide / flake graphite composite filler in an ethanol aqueous solution, then add silane coupling agent KH570 to it, stir and treat to obtain double bond modified composite filler. S4. Add the double bond modified composite filler to toluene, followed by 5-aldehyde-2-thiophene phenylboronic acid and benzoyl peroxide. Heat under reflux until the reaction is complete. After filtration, washing and drying, the modified composite filler is obtained.

[0011] Specifically, in step S1, the mass ratio of flake graphite, anhydrous ethanol, tetrabutyl titanate solution and ammonia is 4-8:100:25-40:3-6.

[0012] More specifically, the tetrabutyl titanate solution has a mass fraction of 25-40%, and the ammonia solution has a mass fraction of 25-28%.

[0013] Specifically, in step S1, the stirring reaction is carried out at room temperature for 6-10 hours.

[0014] Specifically, in step S2, the mass ratio of titanium dioxide / flake graphite composite filler, glucose, and citric acid is 4-8:5-10:0.1-0.2.

[0015] Specifically, in step S2, the curing process is as follows: heat up to 200-250℃ at a rate of 2-5℃ / min and hold for 1-2 hours; the calcination process is as follows: heat up to 1300-1350℃ at a rate of 5-10℃ / min under a nitrogen atmosphere and hold for 2-3 hours.

[0016] Specifically, in step S3, the mass ratio of titanium carbide / flake graphite composite filler to silane coupling agent KH570 is 4-8:0.1-0.2.

[0017] Specifically, in step S3, the stirring process is carried out at room temperature for 1-3 hours.

[0018] Specifically, in step S4, the mass ratio of the double bond modified composite filler, 5-aldehyde-2-thiophene phenylboronic acid and benzoyl peroxide is 5-10:1-2:0.1-0.2.

[0019] Specifically, in step S4, the temperature of the reflux reaction is 80-90℃, and the reflux reaction time is 3-5h.

[0020] In this invention, a sol-gel method is employed. First, TiO2 is loaded onto the surface of flake graphite. Then, glucose is polymerized under the action of an acidic catalyst (citric acid) and carbonized at high temperature to form amorphous carbon. This carbon source undergoes a carbothermic reduction reaction with the TiO2 on the surface under high-temperature calcination, converting TiO2 into titanium carbide, thus achieving an in-situ transformation from titanium dioxide to titanium carbide. Flake graphite itself is a sheet-like filler that can extend the penetration path of corrosive media such as water and oxygen. After loading with titanium carbide, the surface roughness and packing density of the flakes are increased, making the coating shielding layer composed of them more dense and greatly improving the anti-corrosion performance of the coating. At the same time, titanium carbide, as a material with extremely high hardness and excellent wear resistance, is introduced onto the surface of flake graphite to improve the wear resistance of the coating.

[0021] Subsequently, the titanium carbide / flake graphite composite filler was surface-treated using silane coupling agent KH570. By introducing double bond groups, the subsequent reaction was facilitated. Then, through the addition reaction of double bonds and aldehyde groups, 5-aldehyde-2-thiophene phenylboronic acid molecules were grafted onto the surface of the composite filler. The boronic acid groups can form reversible boronic acid ester bonds with the ortho-hydroxyl groups in the system. Under external impact, the dynamic bonds can be reversibly broken and reformed, thereby greatly improving the toughness of the coating and further enhancing its wear resistance. In addition, the phenylboronic acid groups and thiophene groups can interact with the oxide layer on the surface of the metal substrate through hydrogen bonding and coordination, enhancing the interfacial bonding force between the filler and the substrate, which helps to improve interfacial stability and corrosion resistance.

[0022] In the technical solution disclosed in this invention, the dispersant prevents particle agglomeration and sedimentation through electrostatic repulsion or steric hindrance, so that it is uniformly and stably dispersed in the system. The number of parts of the dispersant can be 1 part, 1.5 parts, 2 parts, 2.5 parts, or 3 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0023] Specifically, the dispersant is selected from at least one of BYK-190, BYK-192, and BYK-194.

[0024] In the technical solution disclosed in this invention, the leveling agent can reduce the surface tension of the system, promote better flow and spread of the coating liquid, and eliminate surface defects such as brush marks and orange peel. The amount of leveling agent can be selected as 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, or 1 part, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0025] Specifically, the leveling agent is selected from at least one of BYK-345, BYK-346, and BYK-349.

[0026] In the technical solution disclosed in this invention, the defoamer can effectively destroy the bubble wall and quickly discharge it from the system, preventing defects such as pinholes and fish eyes from forming after drying and film formation. The amount of defoamer can be selected as 0.3 parts, 0.4 parts, 0.5 parts, or 0.6 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0027] Specifically, the defoamer is selected from polyether-modified silicone defoamers.

[0028] In the technical solution disclosed in this invention, the anti-flash rust agent can effectively suppress the problem of "flash rust" that easily occurs on the protected steel surface before the wet coating is fully dry by forming a passivation film or adsorption layer at the metal interface. The amount of anti-flash rust agent can be selected as 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, or 1 part, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0029] Specifically, the flash rust inhibitor is selected from at least one of ammonium molybdate, sodium molybdate, and benzotriazole.

[0030] In the technical solution disclosed in this invention, deionized water is used as a dispersion medium to adjust the viscosity of the coating. The amount of deionized water can be selected as 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, 18 parts, or 20 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0031] In the technical solution disclosed in this invention, the curing agent undergoes a cross-linking reaction with the active groups on the epoxy resin molecular chain to form a coating film. The amount of curing agent can be selected as 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0032] Specifically, the curing agent is selected from at least one of aliphatic amines, cycloaliphatic amines, and acid anhydrides.

[0033] The present invention also provides a method for preparing the above-mentioned anti-corrosion coating for steel pipe piles, comprising the following steps: mixing epoxy resin emulsion, polyurethane emulsion, dispersant, leveling agent, defoamer, anti-flash rust agent and deionized water evenly, then adding modified composite filler and mixing evenly, then adding curing agent and mixing evenly to obtain the anti-corrosion coating for steel pipe piles.

[0034] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention uses epoxy resin emulsion as the base resin, which constitutes the main continuous phase of the coating film. It can adhere tightly to the surface of the steel pipe pile to form a strong and barrier protective layer, effectively preventing the penetration of corrosive media such as moisture, oxygen and chloride ions. At the same time, by using epoxy resin emulsion and polyurethane emulsion for compounding, the toughness of the coating film can be improved, thereby improving the crack resistance and deformation resistance of the coating.

[0035] (2) The present invention adopts the sol-gel method. First, TiO2 is loaded on the surface of flake graphite. Then, glucose is polymerized under the action of acidic catalyst (citric acid) and carbonized at high temperature to form amorphous carbon. The carbon source undergoes a carbothermic reduction reaction with TiO2 on the surface under high temperature calcination environment, converting TiO2 into titanium carbide, realizing the in-situ transformation of titanium dioxide to titanium carbide. Flake graphite itself is a sheet-like filler, which can extend the penetration path of corrosive media such as water and oxygen. After loading titanium carbide, the surface roughness and packing density of the sheet are increased, making the coating shielding layer composed of them more dense and greatly improving the anti-corrosion performance of the coating. At the same time, titanium carbide is a material with extremely high hardness and excellent wear resistance. Introducing it to the surface of flake graphite improves the wear resistance of the coating.

[0036] (3) In this invention, 5-aldehyde-2-thiophene phenylboronic acid molecules are grafted onto the surface of the composite filler. The boronic acid group can form a reversible boronic acid ester bond with the ortho-hydroxyl group in the system. When subjected to external impact, the dynamic bond can be reversibly broken and recombined, thereby greatly improving the toughness of the coating and further improving the wear resistance of the coating. In addition, the phenylboronic acid group and the thiophene group can interact with the oxide layer on the surface of the metal substrate through hydrogen bonding and coordination, which enhances the interfacial bonding force between the filler and the substrate and helps to improve the interfacial stability and corrosion resistance. Detailed Implementation

[0037] The present invention will be further described in detail below through specific preferred embodiments, but the present invention is not limited to the following embodiments.

[0038] It should be noted that, unless otherwise specified, all chemical reagents involved in this invention were purchased through commercial channels.

[0039] The epoxy resin emulsion used in this embodiment of the invention is epoxy resin E-44; the polyurethane emulsion is F0410; the flake graphite has the CAS number 7782-42-5 and a mesh size of 400 mesh; and the polyether modified silicone defoamer is HX-131.

[0040] Example 1 A method for preparing an anti-corrosion coating for steel pipe piles includes the following steps: Mix 60 parts epoxy resin emulsion, 20 parts polyurethane emulsion, 1 part dispersant BYK-192, 0.5 parts leveling agent BYK-346, 0.3 parts polyether modified silicone defoamer, 0.5 parts anti-flash rust agent sodium molybdate, and 10 parts deionized water evenly. Then add 15 parts modified composite filler and mix evenly. Finally, add 5 parts methyldiethanolamine and 5 parts triethylenetetramine and mix evenly to obtain the anti-corrosion coating for steel pipe piles.

[0041] The modified composite filler is prepared as follows: S1. Disperse 4g of flake graphite in 100g of anhydrous ethanol, then add 25g of 25wt% tetrabutyl titanate solution and 5g of 25wt% ammonia water, stir and react at room temperature for 8h. After the reaction is completed, filter, wash and dry to obtain titanium dioxide / flake graphite composite filler. S2. Disperse 8g of titanium dioxide / flake graphite composite filler, 15g of glucose and 0.2g of citric acid in 100g of anhydrous ethanol. After uniform dispersion, remove the solvent and heat to 200℃ at a rate of 5℃ / min. Keep the temperature and cure for 1h. Then, under a nitrogen atmosphere, heat to 1300℃ at a rate of 10℃ / min and keep the temperature for 2h to obtain titanium carbide / flake graphite composite filler. S3. Disperse 5g of titanium carbide / flake graphite composite filler in 100mL of ethanol aqueous solution (ethanol to water volume ratio of 3:1), then add 0.1g of silane coupling agent KH570, stir at room temperature for 2h to obtain double bond modified composite filler. S4. Add 5g of double bond modified composite filler to 100mL of toluene, then add 1g of 5-aldehyde-2-thiophene phenylboronic acid and 0.1g of benzoyl peroxide. Heat under nitrogen atmosphere and reflux at 90℃ for 3h. After the reaction is completed, filter, wash and dry to obtain the modified composite filler.

[0042] Example 2 A method for preparing an anti-corrosion coating for steel pipe piles includes the following steps: Mix 80 parts epoxy resin emulsion, 30 parts polyurethane emulsion, 3 parts dispersant BYK-192, 1 part leveling agent BYK-346, 0.6 parts polyether modified silicone defoamer, 1 part anti-flash rust agent sodium molybdate, and 20 parts deionized water evenly. Then add 25 parts modified composite filler and mix evenly. Finally, add 5 parts methyldiethanolamine and 10 parts triethylenetetramine and mix evenly to obtain the anti-corrosion coating for steel pipe piles.

[0043] The modified composite filler is prepared as follows: S1. Disperse 8g of flake graphite in 100g of anhydrous ethanol, then add 40g of 25wt% tetrabutyl titanate solution and 6g of 25wt% ammonia water, stir and react at room temperature for 8h. After the reaction is completed, filter, wash and dry to obtain titanium dioxide / flake graphite composite filler. S2. Disperse 8g of titanium dioxide / flake graphite composite filler, 20g of glucose and 0.2g of citric acid in 100g of anhydrous ethanol. After uniform dispersion, remove the solvent and heat to 200℃ at a rate of 5℃ / min. Keep the temperature and cure for 1h. Then, under a nitrogen atmosphere, heat to 1300℃ at a rate of 10℃ / min and keep the temperature for 2h to obtain titanium carbide / flake graphite composite filler. S3. Disperse 5g of titanium carbide / flake graphite composite filler in 100mL of ethanol aqueous solution (ethanol to water volume ratio of 3:1), then add 0.2g of silane coupling agent KH570, stir at room temperature for 2h to obtain double bond modified composite filler. S4. Add 5g of double bond modified composite filler to 100mL of toluene, then add 1.5g of 5-aldehyde-2-thiophene phenylboronic acid and 0.1g of benzoyl peroxide. Heat under nitrogen atmosphere and reflux at 90℃ for 3h. After the reaction is completed, filter, wash and dry to obtain the modified composite filler. Example 3

[0044] A method for preparing an anti-corrosion coating for steel pipe piles includes the following steps: 65 parts epoxy resin emulsion, 25 parts polyurethane emulsion, 2 parts dispersant BYK-192, 0.8 parts leveling agent BYK-346, 0.5 parts polyether modified silicone defoamer, 0.8 parts anti-flash rust agent sodium molybdate, and 15 parts deionized water are mixed evenly. Then, 20 parts modified composite filler are added and mixed evenly. Finally, 5 parts methyldiethanolamine and 8 parts triethylenetetramine are added and mixed evenly to obtain the anti-corrosion coating for steel pipe piles.

[0045] The modified composite filler is prepared as follows: S1. Disperse 5g of flake graphite in 100g of anhydrous ethanol, then add 40g of 25wt% tetrabutyl titanate solution and 5g of 25wt% ammonia water, stir and react at room temperature for 8h. After the reaction is completed, filter, wash and dry to obtain titanium dioxide / flake graphite composite filler. S2. Disperse 8g of titanium dioxide / flake graphite composite filler, 20g of glucose and 0.2g of citric acid in 100g of anhydrous ethanol. After uniform dispersion, remove the solvent and heat to 200℃ at a rate of 5℃ / min. Keep the temperature and cure for 1h. Then, under a nitrogen atmosphere, heat to 1300℃ at a rate of 10℃ / min and keep the temperature for 2h to obtain titanium carbide / flake graphite composite filler. S3. Disperse 8g of titanium carbide / flake graphite composite filler in 100mL of ethanol aqueous solution (ethanol to water volume ratio of 3:1), then add 0.2g of silane coupling agent KH570, stir at room temperature for 2h to obtain double bond modified composite filler. S4. Add 8g of double bond modified composite filler to 100mL of toluene, then add 2g of 5-aldehyde-2-thiophene phenylboronic acid and 0.2g of benzoyl peroxide. Heat under nitrogen atmosphere and reflux at 90℃ for 3h. After the reaction is completed, filter, wash and dry to obtain the modified composite filler. Comparative Example 1

[0046] A method for preparing an anti-corrosion coating for steel pipe piles includes the following steps: Mix 60 parts epoxy resin emulsion, 20 parts polyurethane emulsion, 1 part dispersant BYK-192, 0.5 parts leveling agent BYK-346, 0.3 parts polyether modified silicone defoamer, 0.5 parts anti-flash rust agent sodium molybdate, and 10 parts deionized water evenly. Then add 15 parts modified composite filler and mix evenly. Finally, add 5 parts methyldiethanolamine and 5 parts triethylenetetramine and mix evenly to obtain the anti-corrosion coating for steel pipe piles.

[0047] The modified composite filler is prepared as follows: S1. Disperse 5g of flake graphite in 100mL of ethanol-water solution (volume ratio of ethanol to water is 3:1), then add 0.1g of silane coupling agent KH570, stir at room temperature for 2h to obtain double bond modified flake graphite. S2. Add 5g of double-bond modified flake graphite to 100mL of toluene, then add 1g of 5-aldehyde-2-thiophene phenylboronic acid and 0.1g of benzoyl peroxide. Heat under nitrogen atmosphere and reflux at 90℃ for 3h. After the reaction is completed, filter, wash and dry to obtain the modified composite filler.

[0048] Compared with Comparative Example 1 and Example 1, titanium carbide / flake graphite composite filler was replaced with flake graphite. Comparative Example 2

[0049] A method for preparing an anti-corrosion coating for steel pipe piles includes the following steps: Mix 60 parts epoxy resin emulsion, 20 parts polyurethane emulsion, 1 part dispersant BYK-192, 0.5 parts leveling agent BYK-346, 0.3 parts polyether modified silicone defoamer, 0.5 parts anti-flash rust agent sodium molybdate, and 10 parts deionized water evenly. Then add 15 parts modified composite filler and mix evenly. Finally, add 5 parts methyldiethanolamine and 5 parts triethylenetetramine and mix evenly to obtain the anti-corrosion coating for steel pipe piles.

[0050] The modified composite filler is prepared as follows: S1. Disperse 4g of flake graphite in 100g of anhydrous ethanol, then add 25g of 25wt% tetrabutyl titanate solution and 5g of 25wt% ammonia water, stir and react at room temperature for 8h. After the reaction is completed, filter, wash and dry to obtain titanium dioxide / flake graphite composite filler. S2. Disperse 5g of titanium dioxide / flake graphite composite filler in 100mL of ethanol aqueous solution (ethanol to water volume ratio of 3:1), then add 0.1g of silane coupling agent KH570, stir at room temperature for 2h to obtain double bond modified composite filler. S3. Add 5g of double bond modified composite filler to 100mL of toluene, then add 1g of 5-aldehyde-2-thiophene phenylboronic acid and 0.1g of benzoyl peroxide. Heat under nitrogen atmosphere and reflux at 90℃ for 3h. After the reaction is completed, filter, wash and dry to obtain the modified composite filler.

[0051] Compared with Example 1, Comparative Example 2 uses titanium dioxide / flake graphite composite filler instead of titanium carbide / flake graphite composite filler. Comparative Example 3

[0052] A method for preparing an anti-corrosion coating for steel pipe piles includes the following steps: Mix 60 parts epoxy resin emulsion, 20 parts polyurethane emulsion, 1 part dispersant BYK-192, 0.5 parts leveling agent BYK-346, 0.3 parts polyether modified silicone defoamer, 0.5 parts anti-flash rust agent sodium molybdate, and 10 parts deionized water evenly. Then add 15 parts modified composite filler and mix evenly. Finally, add 5 parts methyldiethanolamine and 5 parts triethylenetetramine and mix evenly to obtain the anti-corrosion coating for steel pipe piles.

[0053] The modified composite filler is prepared as follows: S1. Disperse 4g of flake graphite in 100g of anhydrous ethanol, then add 25g of 25wt% tetrabutyl titanate solution and 5g of 25wt% ammonia water, stir and react at room temperature for 8h. After the reaction is completed, filter, wash and dry to obtain titanium dioxide / flake graphite composite filler. S2. Disperse 8g of titanium dioxide / flake graphite composite filler, 15g of glucose and 0.2g of citric acid in 100g of anhydrous ethanol. After uniform dispersion, remove the solvent and heat to 200℃ at a rate of 5℃ / min. Keep at this temperature for 1h and then heat to 1300℃ at a rate of 10℃ / min under a nitrogen atmosphere. Keep at this temperature for 2h to obtain the modified composite filler.

[0054] Compared to Comparative Example 3 and Example 1, the titanium carbide / flake graphite composite filler was not treated with grafting 5-aldehyde-2-thiophene phenylboronic acid.

[0055] The anti-corrosion coatings prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance tests, as detailed below: The degreased and derusted Q345 steel was immersed in the anti-corrosion coatings prepared in Examples 1-3 and Comparative Examples 1-3, respectively. After 5 minutes, it was taken out and dried at 80°C to form an anti-corrosion coating on the surface of the steel. Then, performance tests were performed.

[0056] Abrasion resistance test: The test standard refers to GB / T 1768-2006. The JM-Ⅰ type paint film abrasion tester was used to test the samples. The weight of the weight was 500g, the test speed was 1000 revolutions, and each sample was tested three times. The average value of the results was taken. Adhesion test: The test was conducted in accordance with GB / T 5210-2006 "Paints and Varnishes - Pull-off test". Neutral salt spray test: The test method refers to GB / T 10125-2012. The corrosion resistance of the sample is evaluated by observing the time it takes for white rust to appear on the steel plate. The test results are shown in Table 1.

[0057] Table 1 Performance test results for each group Wear amount (mg) Adhesion (MPa) Salt spray resistance (h) Example 1 6.8 9.7 ＞960 Example 2 5.5 10.2 ＞960 Example 3 6.1 9.6 ＞960 Comparative Example 1 72 9.8 360h surface bubbling Comparative Example 2 27 9.5 ＞960 Comparative Example 3 33 7.3 720h surface bubbling As can be seen from Table 1, compared with Comparative Examples 1-3, the anti-corrosion coating prepared by the present invention has excellent wear resistance and anti-corrosion properties, and has a strong bonding ability with the substrate surface.

[0058] Finally, it should be noted that the above embodiments do not limit the present invention in any way. Those skilled in the art can make modifications and improvements based on the present invention. Therefore, any modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. An anti-corrosion coating for steel pipe piles, characterized in that, The anti-corrosion coating comprises the following raw materials in parts by weight: 60-80 parts epoxy resin emulsion, 20-30 parts polyurethane emulsion, 15-25 parts modified composite filler, 1-3 parts dispersant, 0.5-1 part leveling agent, 0.3-0.6 parts defoamer, 0.5-1 part anti-flash rust agent, 10-20 parts deionized water, and 10-15 parts curing agent.

2. The anti-corrosion coating for steel pipe piles according to claim 1, characterized in that, The preparation method of the modified composite filler is as follows: S1. Disperse flake graphite in anhydrous ethanol, then add tetrabutyl titanate solution and ammonia water, stir to react, and after the reaction is completed, filter, wash and dry to obtain titanium dioxide / flake graphite composite filler. S2. Titanium dioxide / flake graphite composite filler, glucose and citric acid are dispersed in anhydrous ethanol. After uniform dispersion, the solvent is removed, and the mixture is cured and calcined to obtain titanium carbide / flake graphite composite filler. S3. Disperse the titanium carbide / flake graphite composite filler in an ethanol aqueous solution, then add silane coupling agent KH570 to it, stir and treat to obtain double bond modified composite filler. S4. Add the double bond modified composite filler to toluene, followed by 5-aldehyde-2-thiophene phenylboronic acid and benzoyl peroxide. Heat under reflux until the reaction is complete. After filtration, washing and drying, the modified composite filler is obtained.

3. The anti-corrosion coating for steel pipe piles according to claim 2, characterized in that, In step S1, the mass ratio of flake graphite, anhydrous ethanol, tetrabutyl titanate solution and ammonia is 4-8:100:25-40:3-6, wherein the mass fraction of tetrabutyl titanate solution is 25-40% and the mass fraction of ammonia is 25-28%.

4. The anti-corrosion coating for steel pipe piles according to claim 2, characterized in that, In step S2, the mass ratio of titanium dioxide / flake graphite composite filler, glucose and citric acid is 4-8:5-10:0.1-0.

2.

5. The anti-corrosion coating for steel pipe piles according to claim 2, characterized in that, In step S2, the specific curing process is as follows: heat up to 200-250℃ at a rate of 2-5℃ / min and hold for 1-2 hours; the specific calcination process is as follows: heat up to 1300-1350℃ at a rate of 5-10℃ / min under a nitrogen atmosphere and hold for 2-3 hours.

6. The anti-corrosion coating for steel pipe piles according to claim 2, characterized in that, In step S3, the mass ratio of titanium carbide / flake graphite composite filler to silane coupling agent KH570 is 4-8:0.1-0.

2.

7. The anti-corrosion coating for steel pipe piles according to claim 2, characterized in that, In step S4, the mass ratio of the double bond modified composite filler, 5-aldehyde-2-thiophene phenylboronic acid and benzoyl peroxide is 5-10:1-2:0.1-0.

2.

8. The anti-corrosion coating for steel pipe piles according to claim 1, characterized in that, The dispersant is selected from at least one of BYK-190, BYK-192, and BYK-194; the leveling agent is selected from at least one of BYK-345, BYK-346, and BYK-349; and the defoamer is selected from polyether-modified silicone defoamers.

9. The anti-corrosion coating for steel pipe piles according to claim 1, characterized in that, The flash rust inhibitor is selected from at least one of ammonium molybdate, sodium molybdate, and benzotriazole; the curing agent is selected from at least one of aliphatic amines, cycloaliphatic amines, and acid anhydrides.

10. The method for preparing the anti-corrosion coating for steel pipe piles as described in any one of claims 1-9, characterized in that, The process includes the following steps: mixing epoxy resin emulsion, polyurethane emulsion, dispersant, leveling agent, defoamer, anti-flash rust agent and deionized water evenly, then adding modified composite filler and mixing evenly, then adding curing agent and mixing evenly to obtain the anti-corrosion coating for steel pipe piles.