Hydrophobic anticorrosive coating for underwater steel pipe pile and method for preventing breeding of marine organisms
By preparing a combined coating containing zinc oxide microparticles and silica gel on the surface of underwater steel pipe piles, the problem of insufficient corrosion resistance of traditional coatings in marine environments is solved, achieving efficient corrosion protection and prevention of marine organism growth.
Patent Information
- Application Number
- CN202511101890.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-07
- Publication Date
- 2025-11-11
AI Technical Summary
Existing anti-corrosion coatings suffer from problems such as high solvent pollution, short anti-corrosion life, and poor weather resistance in marine environments. They are difficult to possess excellent comprehensive performance at the same time and cannot effectively prevent the growth of marine organisms.
A combination of a hydrophobic coating liquid containing zinc oxide particles and a silica gel coating liquid is used to prepare a hydrophobic and anti-corrosion coating. The inner anti-corrosion coating liquid prevents marine organism corrosion, while the hydrophobic coating prevents biological adhesion.
It has achieved the formation of a highly efficient hydrophobic and anti-corrosion coating on the surface of underwater steel pipe piles, which improves the hydrophobic properties of the coating, prevents marine organisms from attaching, extends the anti-corrosion life, and enhances weather resistance.
Abstract
Description
Technical Field
[0001] This invention belongs to the field of corrosion protection technology, and in particular relates to a hydrophobic anti-corrosion coating for underwater steel pipe piles and a method for preventing the growth of marine organisms. Background Technology
[0002] Corrosion of steel structures in marine engineering is diverse, including galvanic corrosion, cavitation erosion, wear corrosion, impact corrosion, hydrogen evolution corrosion, and oxygen absorption corrosion. Commonly used heavy-duty anti-corrosion coatings include epoxy anti-corrosion coatings, fluorocarbon anti-corrosion coatings, polyurethane anti-corrosion coatings, rubber anti-corrosion coatings, organic (inorganic) silicone resin coatings, polyurea elastomer anti-corrosion coatings, glass flake heavy-duty anti-corrosion coatings, and organic (inorganic) zinc-rich coatings. Protection of marine metal substrates primarily involves using corrosion-resistant materials, adding corrosion inhibitors, metal surface modification, coating protection, and electrochemical protection. Coating protection is a traditional marine corrosion protection technology, involving applying corrosion-resistant coatings to the metal substrate surface, which are then cured at high or room temperature to form a protective film.
[0003] Traditional anti-corrosion coatings are limited in application due to factors such as high solvent pollution, short anti-corrosion life, poor corrosion resistance, and weak weather resistance. Improving the performance of resins from a structural perspective often results in a trade-off between different aspects of the coating's performance, making it difficult to achieve excellent overall properties. Summary of the Invention
[0004] In view of this, the present invention aims to overcome the defects in the prior art and proposes a hydrophobic anti-corrosion coating for underwater steel pipe piles and a method for preventing the growth of marine organisms.
[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:
[0006] This invention provides a hydrophobic anti-corrosion coating for underwater steel pipe piles, wherein the hydrophobic anti-corrosion coating comprises a hydrophobic coating liquid and an anti-corrosion coating liquid; the hydrophobic coating liquid is a hydrophobic coating liquid containing zinc oxide particles, and the anti-corrosion coating liquid is a silica gel coating liquid.
[0007] Furthermore, the preparation method of the hydrophobic coating liquid includes the following steps:
[0008] (1) Stir the zinc oxide microparticle solution and add isopropyl orthosilicate and 3-glycidoxypropyltriethoxysilane dropwise. After the reaction is complete, centrifuge and dry to obtain hydrophobic microparticles.
[0009] (2) Add 3-(N-cyclohexylamino)propyltrimethoxysilane and tetraethyl orthosilicate to an ethanol solution and adjust the pH of the solution to 2-6 to obtain a precursor solution;
[0010] (3) The hydrophobic microparticles are dispersed in ethanol, and the precursor solution is added under stirring conditions. After mixing evenly, the hydrophobic coating liquid is obtained.
[0011] Further, the preparation method of the zinc oxide microparticle solution in step (1) is as follows: zinc nitrate is dissolved in an ethanol solution, sodium dodecyl sulfonate is added to it, and the mixture is stirred evenly to obtain the zinc oxide microparticle solution; the solid-liquid ratio of zinc nitrate, sodium dodecyl sulfonate and ethanol solution is 1-10g:10-20g:100-200mL; the mass concentration of the ethanol solution is 20-60%. The addition of zinc oxide microparticles improves the antibacterial properties of the coating. The addition of isopropyl orthosilicate improves the hydrophobicity of the coating, and the zinc oxide microparticles improve the dispersibility of isopropyl orthosilicate in the coating.
[0012] Furthermore, in step (1), the volume ratio of zinc oxide microparticle solution to isopropyl orthosilicate and 3-glycidoxypropyltriethoxysilane is 100-200:1-50:1-20; in step (2), the volume ratio of 3-(N-cyclohexylamino)propyltrimethoxysilane to ethyl orthosilicate and ethanol solution is 1-20:0.1-10:100-200; and the mass concentration of the ethanol solution is 20-60%.
[0013] Furthermore, the solid-liquid ratio of the hydrophobic microparticles in step (3) to the precursor solution is 0.1-20g:100-1000mL.
[0014] Furthermore, the preparation method of the anti-corrosion coating liquid includes the following steps:
[0015] (1) Add methylene blue to an ethanol solution, add tetraethyl orthosilicate dropwise under stirring, and centrifuge, wash and dry after reaction to obtain silica composite particles.
[0016] (2) Dissolve tetraethyl orthosilicate in ethanol solution, adjust the pH of the solution to 2-5, stir for 1-2 hours, then adjust the pH of the solution to 8-9, and age to obtain intermediate solution;
[0017] (3) Add the mixture of hexamethyldisilaneamine and n-hexane to the intermediate solution, and obtain silica gel by reaction, filtration and washing.
[0018] (4) The silica gel is dispersed in n-propanol, and after centrifugation, the upper liquid is retained. The silica composite particles are added to it and mixed evenly to obtain the anti-corrosion coating liquid.
[0019] When silica and methylene blue are combined, the local charge changes under the stimulation of acids and alkalis, breaking the charge balance. This causes the originally tightly bound silica and methylene blue composite particles to loosen, and the methylene blue gradually escapes from the composite particles and enters the coating, which can effectively inhibit corrosion.
[0020] Furthermore, in step (1), the solid-liquid ratio of methylene blue, tetraethyl orthosilicate, and ethanol solution is 1-10g:0.1-1mL:50-100mL; and the mass concentration of the ethanol solution is 20-60%.
[0021] Furthermore, in step (2), the solid-liquid ratio of tetraethyl orthosilicate to ethanol solution is 1-10g:50-100mL; and the mass concentration of ethanol solution is 20-60%.
[0022] Furthermore, in step (3), the mass ratio of hexamethyldisilaneamine to n-hexane is 1-10:1-50; and in step (4), the solid-liquid ratio of silica gel, silica composite particles and n-propanol is 10-100g:0.1-1g:200-1000mL.
[0023] The present invention also provides a method for preventing the growth of marine organisms using the aforementioned hydrophobic and anti-corrosion coating, comprising the following steps:
[0024] (1) Apply the anti-corrosion coating liquid to the surface of the steel pipe pile and dry it to obtain the anti-corrosion coating.
[0025] (2) The hydrophobic coating liquid is sprayed onto the anti-corrosion coating and then heat-treated to obtain the coating.
[0026] The drying step in step (1) is performed at a temperature of 80-200℃ for 1-5 hours; the heat treatment step in step (2) is performed at a temperature of 80-150℃ for 1-5 hours.
[0027] Compared with the prior art, the present invention has the following advantages:
[0028] The hydrophobic anti-corrosion coating for underwater steel pipe piles described in this invention first prepares an anti-corrosion coating liquid on the surface of the steel pipe pile, and then prepares a hydrophobic coating. The inner anti-corrosion coating liquid effectively prevents marine organisms from corroding the steel pipe pile, and the hydrophobic coating improves the hydrophobic properties of the coating and prevents the attachment of marine organisms. Detailed Implementation
[0029] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art. Unless otherwise specified, the experimental reagents used in the following embodiments are conventional biochemical reagents; and the experimental methods described are conventional methods.
[0030] The present invention will be described in detail below with reference to the embodiments.
[0031] Example 1
[0032] A method for preventing marine organism growth using the aforementioned hydrophobic and anti-corrosion coating includes the following steps:
[0033] (1) Preparation of zinc oxide microparticle solution: Dissolve 5g of zinc nitrate in 200mL of 20% ethanol solution, add 2g of sodium dodecyl sulfonate, mix well to obtain zinc oxide microparticle solution;
[0034] (2) Preparation of hydrophobic coating solution: 120 mL of zinc oxide microparticle solution was stirred, and 10 mL of isopropyl orthosilicate and 5 mL of 3-glycidoxypropyltriethoxysilane were added dropwise. After the reaction was completed, the solution was centrifuged and dried to obtain hydrophobic microparticles. 5 mL of 3-(N-cyclohexylamino)propyltrimethoxysilane and 0.5 mL of tetraethyl orthosilicate were added to 180 mL of 20% ethanol solution, and the pH of the solution was adjusted to 2-6 to obtain a precursor solution. 2 g of the hydrophobic microparticles were dispersed in 100 mL of ethanol, and 100 mL of the precursor solution was added under stirring. After mixing evenly, the hydrophobic coating solution was obtained.
[0035] (3) Preparation of anti-corrosion coating liquid: 2g of methylene blue was added to 50mL of 20% ethanol solution, and 0.5mL of tetraethyl orthosilicate was added dropwise under stirring. After reaction, the solution was centrifuged, washed and dried to obtain silica composite particles. 1g of tetraethyl orthosilicate was dissolved in 80mL of 20% ethanol solution, the pH of the solution was adjusted to 3, stirred for 1-2 hours, and then the pH of the solution was adjusted to 9. After aging, an intermediate solution was obtained. A mixture of 2g of hexamethyldisilaneamine and 5g of n-hexane was added to the intermediate solution. After reaction, filtration and washing, silica gel was obtained. 50g of silica gel was dispersed in 500mL of n-propanol. After centrifugation, the upper liquid was retained, and 0.5g of silica composite particles were added to it. After mixing evenly, the anti-corrosion inner layer was obtained.
[0036] (4) Apply the anti-corrosion coating liquid to the surface of the steel pipe pile and dry it at 100°C for 2 hours to obtain the anti-corrosion coating.
[0037] (5) The hydrophobic coating liquid is sprayed onto the anti-corrosion coating and heat-treated at 100°C for 2 hours. The resulting coating has a contact angle of 157°, a roll-off angle of 4°, and a corrosion current density of 4.962 × 10⁻⁶. -8 .
[0038] Example 2
[0039] A method for preventing marine organism growth using the aforementioned hydrophobic and anti-corrosion coating includes the following steps:
[0040] (1) Preparation of zinc oxide microparticle solution: Dissolve 5g of zinc nitrate in 200mL of 20% ethanol solution, add 2g of sodium dodecyl sulfonate, mix well to obtain zinc oxide microparticle solution;
[0041] (2) Preparation of hydrophobic coating solution: 120 mL of zinc oxide microparticle solution was stirred, and 10 mL of isopropyl orthosilicate and 5 mL of 3-glycidoxypropyltriethoxysilane were added dropwise. After the reaction was completed, the solution was centrifuged and dried to obtain hydrophobic microparticles. 5 mL of 3-(N-cyclohexylamino)propyltrimethoxysilane and 0.5 mL of tetraethyl orthosilicate were added to 180 mL of 20% ethanol solution, and the pH of the solution was adjusted to 2-6 to obtain a precursor solution. 2 g of the hydrophobic microparticles were dispersed in 100 mL of ethanol, and 100 mL of the precursor solution was added under stirring. After mixing evenly, the hydrophobic coating solution was obtained.
[0042] (3) Preparation of anti-corrosion coating solution: 5g of methylene blue was added to 50mL of 20% ethanol solution, and 0.5mL of tetraethyl orthosilicate was added dropwise under stirring. After reaction, the solution was centrifuged, washed and dried to obtain silica composite particles. 1g of tetraethyl orthosilicate was dissolved in 80mL of 20% ethanol solution, the pH of the solution was adjusted to 3, stirred for 1-2 hours, and then the pH of the solution was adjusted to 9. After aging, an intermediate solution was obtained. A mixture of 2g of hexamethyldisilaneamine and 5g of n-hexane was added to the intermediate solution. After reaction, filtration and washing, silica gel was obtained. 50g of silica gel was dispersed in 500mL of n-propanol. After centrifugation, the upper liquid was retained, and 0.5g of silica composite particles were added to it. After mixing evenly, the anti-corrosion inner layer was obtained.
[0043] (4) Apply the anti-corrosion coating liquid to the surface of the steel pipe pile and dry it at 100°C for 2 hours to obtain the anti-corrosion coating.
[0044] (5) The hydrophobic coating liquid is sprayed onto the anti-corrosion coating and heat-treated at 100°C for 2 hours. The resulting coating has a contact angle of 159°, a roll-off angle of 4°, and a corrosion current density of 5.236 × 10⁻⁶. -8 .
[0045] Comparative Example 1
[0046] A method for preventing marine organism growth using the aforementioned hydrophobic and anti-corrosion coating includes the following steps:
[0047] (1) Preparation of zinc oxide microparticle solution: Dissolve 5g of zinc nitrate in 200mL of 20% ethanol solution, mix well to obtain zinc oxide solution;
[0048] (2) Preparation of hydrophobic coating solution: 120 mL of zinc oxide solution was stirred, and 10 mL of isopropyl orthosilicate and 5 mL of 3-glycidoxypropyltriethoxysilane were added dropwise. After the reaction was completed, the solution was centrifuged and dried to obtain microparticles. 5 mL of 3-(N-cyclohexylamino)propyltrimethoxysilane and 0.5 mL of tetraethyl orthosilicate were added to 180 mL of 20% ethanol solution, and the pH of the solution was adjusted to 2-6 to obtain a precursor solution. 2 g of the hydrophobic microparticles were dispersed in 100 mL of ethanol, and 100 mL of the precursor solution was added under stirring. After mixing evenly, the hydrophobic coating solution was obtained.
[0049] (3) Preparation of anti-corrosion coating solution: 5g of methylene blue was added to 50mL of 20% ethanol solution, and 0.5mL of tetraethyl orthosilicate was added dropwise under stirring. After reaction, the solution was centrifuged, washed and dried to obtain silica composite particles. 1g of tetraethyl orthosilicate was dissolved in 80mL of 20% ethanol solution, the pH of the solution was adjusted to 3, stirred for 1-2 hours, and then the pH of the solution was adjusted to 9. After aging, an intermediate solution was obtained. A mixture of 2g of hexamethyldisilaneamine and 5g of n-hexane was added to the intermediate solution. After reaction, filtration and washing, silica gel was obtained. 50g of silica gel was dispersed in 500mL of n-propanol. After centrifugation, the upper liquid was retained, and 0.5g of silica composite particles were added to it. After mixing evenly, the anti-corrosion inner layer was obtained.
[0050] (4) Apply the anti-corrosion coating liquid to the surface of the steel pipe pile and dry it at 100°C for 2 hours to obtain the anti-corrosion coating.
[0051] (5) The hydrophobic coating liquid is sprayed onto the anti-corrosion coating and heat-treated at 100°C for 2 hours. The resulting coating has a contact angle of 148°, a roll-off angle of 6°, and a corrosion current density of 6.108 × 10⁻⁶. -8 .
[0052] Comparative Example 2
[0053] A method for preventing marine organism growth using the aforementioned hydrophobic and anti-corrosion coating includes the following steps:
[0054] (1) Preparation of zinc oxide microparticle solution: Dissolve 5g of zinc nitrate in 200mL of 20% ethanol solution, add 2g of sodium dodecyl sulfonate, mix well to obtain zinc oxide microparticle solution, dry the zinc oxide microparticle solution to obtain zinc oxide microparticles;
[0055] (2) Preparation of hydrophobic coating solution: 5 mL of 3-(N-cyclohexylamino)propyltrimethoxysilane and 0.5 mL of tetraethyl orthosilicate were added to 180 mL of 20% ethanol solution, and the pH of the solution was adjusted to 2-6 to obtain a precursor solution; 2 g of zinc oxide particles were dispersed in 100 mL of ethanol, and the 100 mL of the precursor solution was added under stirring conditions. After mixing evenly, the hydrophobic coating solution was obtained.
[0056] (3) Preparation of anti-corrosion coating solution: 5g of methylene blue was added to 50mL of 20% ethanol solution, and 0.5mL of tetraethyl orthosilicate was added dropwise under stirring. After reaction, the solution was centrifuged, washed and dried to obtain silica composite particles. 1g of tetraethyl orthosilicate was dissolved in 80mL of 20% ethanol solution, the pH of the solution was adjusted to 3, stirred for 1-2 hours, and then the pH of the solution was adjusted to 9. After aging, an intermediate solution was obtained. A mixture of 2g of hexamethyldisilaneamine and 5g of n-hexane was added to the intermediate solution. After reaction, filtration and washing, silica gel was obtained. 50g of silica gel was dispersed in 500mL of n-propanol. After centrifugation, the upper liquid was retained, and 0.5g of silica composite particles were added to it. After mixing evenly, the anti-corrosion inner layer was obtained.
[0057] (4) Apply the anti-corrosion coating liquid to the surface of the steel pipe pile and dry it at 100°C for 2 hours to obtain the anti-corrosion coating.
[0058] (5) The hydrophobic coating liquid is sprayed onto the anti-corrosion coating and heat-treated at 100°C for 2 hours. The resulting coating has a contact angle of 135°, a roll-off angle of 7°, and a corrosion current density of 8.231 × 10⁻⁶. -8 .
[0059] Comparative Example 3
[0060] A method for preventing marine organism growth using the aforementioned hydrophobic and anti-corrosion coating includes the following steps:
[0061] (1) Preparation of zinc oxide microparticle solution: Dissolve 5g of zinc nitrate in 200mL of 20% ethanol solution, add 2g of sodium dodecyl sulfonate, mix well to obtain zinc oxide microparticle solution;
[0062] (2) Preparation of hydrophobic coating solution: 120 mL of zinc oxide microparticle solution was stirred, and 10 mL of isopropyl orthosilicate and 5 mL of 3-glycidoxypropyltriethoxysilane were added dropwise. After the reaction was completed, the solution was centrifuged and dried to obtain hydrophobic microparticles. 5 mL of 3-(N-cyclohexylamino)propyltrimethoxysilane and 0.5 mL of tetraethyl orthosilicate were added to 180 mL of 20% ethanol solution, and the pH of the solution was adjusted to 2-6 to obtain a precursor solution. 2 g of the hydrophobic microparticles were dispersed in 100 mL of ethanol, and 100 mL of the precursor solution was added under stirring. After mixing evenly, the hydrophobic coating solution was obtained.
[0063] (3) Preparation of anti-corrosion coating liquid: Dissolve 1g of tetraethyl orthosilicate in 80mL of 20% ethanol solution, adjust the pH of the solution to 3, stir for 1-2 hours, then adjust the pH of the solution to 9, and age to obtain an intermediate solution; add a mixture of 2g of hexamethyldisilaneamine and 5g of n-hexane to the intermediate solution, react, filter, and wash to obtain silica gel; disperse 50g of silica gel in 500mL of n-propanol, centrifuge, retain the upper liquid, add 0.5g of silica to it, mix evenly to obtain the anti-corrosion inner layer.
[0064] (4) Apply the anti-corrosion coating liquid to the surface of the steel pipe pile and dry it at 100°C for 2 hours to obtain the anti-corrosion coating.
[0065] (5) The hydrophobic coating liquid is sprayed onto the anti-corrosion coating and heat-treated at 100°C for 2 hours. The resulting coating has a contact angle of 142°, a roll-off angle of 6°, and a corrosion current density of 5.863 × 10⁻⁶. -8 .
[0066] Comparative Example 4
[0067] A method for preventing marine organism growth using the aforementioned hydrophobic and anti-corrosion coating includes the following steps:
[0068] (1) Preparation of zinc oxide microparticle solution: Dissolve 5g of zinc nitrate in 200mL of 20% ethanol solution, add 2g of sodium dodecyl sulfonate, mix well to obtain zinc oxide microparticle solution;
[0069] (2) Preparation of anti-corrosion coating liquid: 2g of methylene blue was added to 50mL of 20% ethanol solution, and 0.5mL of tetraethyl orthosilicate was added dropwise under stirring. After reaction, the solution was centrifuged, washed, and dried to obtain silica composite particles. 1g of tetraethyl orthosilicate was dissolved in 80mL of 20% ethanol solution, the pH of the solution was adjusted to 3, stirred for 1-2 hours, and then the pH of the solution was adjusted to 9. After aging, an intermediate solution was obtained. A mixture of 2g of hexamethyldisilaneamine and 5g of n-hexane was added to the intermediate solution. After reaction, filtration, and washing, silica gel was obtained. 50g of silica gel was dispersed in 500mL of n-propanol. After centrifugation, the upper liquid was retained, and 0.5g of silica composite particles were added to it. After mixing evenly, the anti-corrosion inner layer was obtained.
[0070] (3) The anti-corrosion coating liquid is applied to the surface of the steel pipe pile and dried at 100°C for 2 hours. The resulting coating has a contact angle of 122°, a roll-off angle of 8°, and a corrosion current density of 9.765 × 10⁻⁶. -8 .
[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A hydrophobic anti-corrosion coating for underwater steel pipe piles, characterized in that: The hydrophobic and anti-corrosion coating comprises a hydrophobic coating liquid and an anti-corrosion coating liquid; the hydrophobic coating liquid is a hydrophobic coating liquid containing zinc oxide particles, and the anti-corrosion coating liquid is a silica gel coating liquid.
2. The hydrophobic anti-corrosion coating for underwater steel pipe piles according to claim 1, characterized in that: The preparation method of the hydrophobic coating liquid includes the following steps: (1) Stir the zinc oxide microparticle solution and add isopropyl orthosilicate and 3-glycidoxypropyltriethoxysilane dropwise. After the reaction is complete, centrifuge and dry to obtain hydrophobic microparticles. (2) Add 3-(N-cyclohexylamino)propyltrimethoxysilane and tetraethyl orthosilicate to an ethanol solution, adjust the pH of the solution to 2-6, and obtain a precursor solution; (3) The hydrophobic microparticles are dispersed in ethanol, and the precursor solution is added under stirring conditions. After mixing evenly, the hydrophobic coating liquid is obtained.
3. The hydrophobic anti-corrosion coating for underwater steel pipe piles according to claim 2, characterized in that: The zinc oxide microparticle solution in step (1) is prepared as follows: zinc nitrate is dissolved in an ethanol solution, sodium dodecyl sulfonate is added to it, and the mixture is stirred evenly to obtain the zinc oxide microparticle solution; the solid-liquid ratio of zinc nitrate, sodium dodecyl sulfonate and ethanol solution is 1-10g:10-20g:100-200mL; the mass concentration of the ethanol solution is 20-60%.
4. The hydrophobic anti-corrosion coating for underwater steel pipe piles according to claim 2, characterized in that: In step (1), the volume ratio of zinc oxide microparticle solution to isopropyl orthosilicate and 3-glycidoxypropyltriethoxysilane is 100-200:1-50:1-20; in step (2), the volume ratio of 3-(N-cyclohexylamino)propyltrimethoxysilane to tetraethyl orthosilicate and ethanol solution is 1-20:0.1-10:100-200; and the mass concentration of the ethanol solution is 20-60%.
5. The hydrophobic anti-corrosion coating for underwater steel pipe piles according to claim 2, characterized in that: The solid-liquid ratio of the hydrophobic microparticles in step (3) to the precursor solution is 0.1-20g:100-1000mL.
6. The hydrophobic anti-corrosion coating for underwater steel pipe piles according to claim 1, characterized in that: The preparation method of the anti-corrosion coating liquid includes the following steps: (1) Add methylene blue to an ethanol solution, add tetraethyl orthosilicate dropwise under stirring, and centrifuge, wash and dry after reaction to obtain silica composite particles. (2) Dissolve tetraethyl orthosilicate in ethanol solution, adjust the pH of the solution to 2-5, stir for 1-2 hours, then adjust the pH of the solution to 8-9, and age to obtain intermediate solution; (3) Add the mixture of hexamethyldisilaneamine and n-hexane to the intermediate solution, and obtain silica gel by reaction, filtration and washing. (4) The silica gel is dispersed in n-propanol, and after centrifugation, the upper liquid is retained. The silica composite particles are added to it and mixed evenly to obtain the anti-corrosion coating liquid.
7. The hydrophobic anti-corrosion coating for underwater steel pipe piles according to claim 6, characterized in that: In step (1), the solid-liquid ratio of methylene blue, tetraethyl orthosilicate, and ethanol solution is 1-10g:0.1-1mL:50-100mL; the mass concentration of the ethanol solution is 20-60%.
8. The hydrophobic anti-corrosion coating for underwater steel pipe piles according to claim 6, characterized in that: In step (2), the solid-liquid ratio of tetraethyl orthosilicate to ethanol solution is 1-10g:50-100mL; the mass concentration of ethanol solution is 20-60%.
9. The hydrophobic anti-corrosion coating for underwater steel pipe piles according to claim 6, characterized in that: In step (3), the mass ratio of hexamethyldisilaneamine to n-hexane is 1-10:1-50; in step (4), the solid-liquid ratio of silica gel, silica composite particles and n-propanol is 10-100g:0.1-1g:200-1000mL.
10. A method for preventing the growth of marine organisms using a hydrophobic and anti-corrosion coating according to any one of claims 1-9, characterized in that: Includes the following steps: (1) Apply the anti-corrosion coating liquid to the surface of the steel pipe pile and dry it to obtain the anti-corrosion coating. (2) The hydrophobic coating liquid is sprayed onto the anti-corrosion coating and then heat-treated to obtain the coating. The drying step in step (1) is performed at a temperature of 80-200℃ for 1-5 hours; the heat treatment step in step (2) is performed at a temperature of 80-150℃ for 1-5 hours.