Underwater antifouling and anticorrosion functional coating as well as preparation method and application thereof

Abstract

The invention discloses an underwater anti-fouling and anti-corrosion functional coating as well as a preparation method and application thereof, and relates to the technical field of coating materials. The underwater antifouling and anticorrosive functional coating comprises the following components: a hydrophilic polyether monomer, a hydrophobic polyether monomer, a catalyst, a chain extender, epoxy resin, isocyanate, a hydrophilic solvent, modified epoxy resin and a curing agent. The method has the advantages of mild reaction conditions, simple steps and no need of inert gas protection. The prepared coating has the advantages of both polyurethane and epoxy resin, not only can be stably cured in water, but also shows underwater adhesive force and long-term durability superior to those of a pure epoxy coating. Meanwhile, the coating can effectively prevent underwater crude oil adhesion and biological fouling, and the problems that a traditional coating is single in function, weak in underwater adhesion force or complex in preparation process are solved.

Description

Technical Field

[0001] This invention relates to the field of coating materials technology, specifically to an underwater antifouling and anticorrosion functional coating, its preparation method, and its application. Background Technology

[0002] Marine engineering equipment, ships, and other underwater facilities operate for extended periods in harsh environments prone to corrosion and biofouling. Their surface protection relies on coatings that offer both excellent corrosion and fouling resistance. However, traditional single-performance coatings are insufficient to address this dual challenge. Developing integrated coating systems is crucial for extending facility lifespan, reducing maintenance costs, and minimizing environmental pollution.

[0003] Existing coating technologies have significant limitations. On the one hand, while ordinary hydrogel or hydrophilic polyurethane coatings can mitigate biofouling to some extent through surface hydration, their loose cross-linking network and low modulus result in severely insufficient adhesion and mechanical strength underwater, making them prone to peeling, and their anti-corrosion performance is almost negligible. On the other hand, traditional epoxy resin coatings, with their excellent adhesion, high cross-linking density, and superior barrier properties, have become the cornerstone of the anti-corrosion field. However, their hard, hydrophobic surface makes them highly susceptible to biofouling or dirt adhesion, and prolonged immersion in water can lead to plasticization or hydrolysis, resulting in decreased water resistance and protective failure. Even more challenging is that existing coatings that combine the advantages of both approaches often involve complex multi-step reactions, demanding synthesis conditions, or the use of expensive specialty raw materials, posing significant obstacles to process repeatability, cost control, and large-scale production, greatly limiting their practical application. Summary of the Invention

[0004] The purpose of this invention is to provide an underwater antifouling and anticorrosion functional coating, its preparation method, and its application. This method features mild reaction conditions, simple steps, and requires no inert gas protection. The prepared coating combines the advantages of polyurethane and epoxy resin, not only achieving stable curing in water but also exhibiting superior underwater adhesion and long-term durability compared to pure epoxy coatings. Simultaneously, this coating effectively prevents underwater crude oil adhesion and biofouling, solving the problems of traditional coatings having limited functionality, weak underwater adhesion, or complex preparation processes.

[0005] To achieve the above objectives, this invention discloses an underwater antifouling and anticorrosion functional coating. The underwater antifouling and anticorrosion functional coating is a modified polyurethane coating polymerized from polyurethane. The modified polyurethane coating comprises the following components in parts by weight: 100-300 parts hydrophilic polyether monomer, 100-500 parts hydrophobic polyether monomer, 1-10 parts catalyst, 80-200 parts chain extender, 100-300 parts epoxy resin, 100-200 parts isocyanate, and 1000-2000 parts hydrophilic solvent, 5000-20000 parts modified epoxy resin, and 2000-7000 parts curing agent.

[0006] Preferably, the hydrophilic polyether monomer is at least one of polyethylene glycol, polyethylene glycol dicarboxylic acid, polyethylene glycol diglycidyl ether, polyether siloxane, and amino-terminated polyethylene glycol.

[0007] Preferably, the hydrophobic polyether monomer is selected from at least one of polytetrahydrofuran, polypropylene glycol, polybutane glycol, and a copolymer of polyethylene and polydimethylsiloxane (PE-PDMS).

[0008] Preferably, the epoxy resin is a bisphenol A type epoxy resin or a bisphenol F type epoxy resin, and is at least one of E44, E55, E51, E54, E42, E20, E14, E12, F-51, and YDF-170.

[0009] Preferably, the hydrophilic solvent is selected from at least one of N,N-dimethylacetamide, N,N-dimethylformamide, dimethyl sulfoxide, N-methylpyrrolidone, and tetrahydrofuran; The catalyst is at least one of triethylamine, triethylenediamine, stannous octoate, zinc naphthenate, cobalt / lead naphthenate, 1-butylphosphonocyclopentane, dibutyltin dilaurate, N-methylmorpholine, and N-ethylmorpholine. The chain extender is at least one of ethylenediamine, diethylenetriamine, triethylenetetramine, isophorone diamine, m-phenylenediamine, m-phenylenediamine, diaminodiphenylmethane, and polyetheramine.

[0010] The isocyanate is at least one of aliphatic isocyanate, aromatic isocyanate, and alicyclic isocyanate, and preferably at least one of PDI, NDI, NBDI, PPDI, TDI, HMDI, IPDI, HDI, XDI, TMXDI, and CHDI.

[0011] Preferably, the curing agent is at least one of ethylenediamine, diethylenetriamine, triethylenetetramine, m-phenylenediamine, polyetheramine, phenolic amine (T31), and modified alicyclic amine (1618); the modified epoxy resin is at least one of bisphenol A type epoxy resin, high-purity bisphenol A diglycidyl ether, phenolic epoxy resin, and bisphenol F type epoxy resin, specifically at least one of DER331, DER332, DER332, E55, E51, E12, F-51, and YDF-170.

[0012] This invention also provides a method for preparing the above-mentioned underwater antifouling and anticorrosion functional coating, comprising the following steps: (1) Distill the hydrophilic polyether monomer and the hydrophobic polyether monomer separately under reduced pressure; (2) The hydrophilic polyether monomer and hydrophobic polyether monomer after vacuum distillation are mixed evenly with isocyanate, epoxy resin, catalyst and hydrophilic solvent, and the polymerization reaction is carried out to obtain the prepolymer; (3) Mix the prepolymer with the chain extender. After the reaction is complete, hydrophilic polyurethane is obtained. If the obtained hydrophilic polyurethane is used to prepare a coating polymer and coated on the substrate, an underwater antifouling coating can be obtained. (4) The above-mentioned hydrophilic polyurethane is blended with the modified epoxy resin and then an amine curing agent is added to obtain a coating polymer. The polymer is coated on the substrate, soaked in water, dried, and soaked in water again to obtain an underwater antifouling and anticorrosion functional coating.

[0013] Preferably, in step (1), the vacuum distillation temperature is 90-130℃ and the reaction time is 2-4 hours; in step (2), the polymerization reaction temperature is 50-80℃ and the reaction time is 2-8 hours; in step (3), the mixing temperature is 15-35℃ and the reaction time is 0.5-4 hours; and in step (4), the drying temperature is 60-90℃ and the drying time is 1-4 hours.

[0014] Preferably, in step (4), the mass fraction of hydrophilic polyurethane in the coating polymer is 4%-20%.

[0015] The underwater antifouling and anticorrosion functional coating provided by the present invention is applied to the surface of a substrate that is immersed in water. It is applied to the surface of the substrate in the air, and then dried and soaked in water again after immersion in water.

[0016] Therefore, the present invention, employing the above-mentioned underwater antifouling and anticorrosion functional coating, its preparation method, and its application, possesses the following beneficial effects: (1) The functional coating of this invention aims to address the critical need for surface protection of materials in marine environments. After application and immersion in water, the hydrophilic polyether segments migrate to the coating surface, forming a robust hydration layer on the substrate surface. This effectively prevents the adhesion of crude oil and other oily substances, achieving an antifouling effect. The hydrophobic polyether segments provide a flexible chain, improving the stability of the coating. The introduction of epoxy resin, combined with the hydrophobic effect, results in better adhesion between the coating and the substrate, making the coating denser and enabling long-term stable and strong adhesion underwater. Furthermore, its dense network and hydrophobic properties effectively prevent seawater from corroding the substrate beneath the coating. Adding hydrophilic polyurethane to the modified epoxy resin (system) and curing agent prevents the resulting coating from forming wrinkles on the surface when immersed in water, unlike a simple hydrophilic polyurethane coating. Simultaneously, this coating also achieves higher hardness and stronger adhesion.

[0017] (2) This invention utilizes a "prepolymer method" for synthesis and a "soaking-drying-soaking" post-treatment process. The mild conditions eliminate the need for inert gas protection, effectively inducing the formation of hydrophilic / hydrophobic microphase separation structures. This allows the coating to rapidly form in an underwater environment and maintain stable, strong adhesion and comprehensive protective performance over a long period. This method successfully prepares a high-performance coating integrating strong adhesion, excellent corrosion resistance, active antifouling, and anti-oil adhesion, perfectly solving multiple defects of existing technologies. Attached Figure Description

[0018] Figure 1 The images show the results of adhesion and abrasion of the underwater antifouling coating, where a is the abrasion result and b is the folding result. Figure 2 To assess the adhesion of underwater antifouling coatings to various substrates; Figure 3 The underwater adhesion stability of underwater antifouling coatings on various substrates; Figure 4 Underwater oil droplet sliding performance diagram for underwater antifouling coating; Figure 5 Figures showing the hydrophobic properties of underwater antifouling coatings after immersion in solutions of different pH values ​​for 12 hours. Figure 6 Figure showing the hydrophobic properties of an underwater antifouling coating after immersion in seawater for 30 days. Figure 7 A diagram illustrating the self-cleaning capability of underwater antifouling coatings against crude oil. Figure 8 The underwater antifouling coating has high transparency. Figure 9 The images show the antifouling effect of the underwater antifouling coating on pipes and swimming goggles, where a is the effect on the pipe and b is the effect on the swimming goggles. Figure 10 The adhesion diagrams of hydrophilic polyurethane and epoxy modified by blending in different proportions on tinplate are shown. Figure 11 Adhesion graphs of underwater antifouling and anticorrosion coatings on tinplate after immersion in different liquid environments for 12 hours. Figure 12 Before and after images of the underwater antifouling and anticorrosion coating being boiled in water at 100℃ for 12 hours; Figure 13 Adhesion performance diagrams of underwater antifouling and anticorrosion functional coatings and pure epoxy coatings on various substrates; Figure 14 The underwater adhesion stability of underwater antifouling and anticorrosion functional coatings on various substrates; Figure 15The graph shows the oleophobicity of hydrophilic polyurethane and epoxy after blending and modification at different ratios. Figure 16 Underwater oil droplet sliding performance diagram for underwater antifouling and anticorrosion functional coatings; Figure 17 Figures showing the hydrophobic properties of underwater antifouling and anticorrosion coatings after immersion in solutions of different pH values ​​for one month. Figure 18 Figure showing the hydrophobic properties of an underwater antifouling and anticorrosion coating after immersion in seawater for 30 days. Figure 19 A diagram illustrating the self-cleaning capability of underwater antifouling and anticorrosion coatings against crude oil. Figure 20 A comparison chart showing the transparency of underwater antifouling and anticorrosion coatings and pure epoxy coatings; Figure 21 The images show the antifouling effect of an underwater antifouling and anticorrosion coating applied to a small boat against crude oil. In the images, a represents the small boat on the surface of crude oil, b represents the antifouling effect of the coated hull, and c represents the antifouling effect of the uncoated hull. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0021] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. These other embodiments are also covered within the scope of protection of this invention.

[0022] Example 1 This embodiment provides an underwater antifouling coating comprising the following components by weight: 100 parts polyethylene glycol, 150 parts polytetrahydrofuran, 2 parts dibutyltin dilaurate, 80 parts m-phenylenediamine, 100 parts E51, 100 parts IPDI and 1000 parts N,N-dimethylacetamide.

[0023] This embodiment also provides a method for preparing the above-mentioned underwater antifouling and anticorrosion functional coating, including the following steps: (1) Polyethylene glycol and polytetrahydrofuran were distilled under reduced pressure.

[0024] (2) Polyethylene glycol and polytetrahydrofuran after vacuum distillation are mixed with IPDI, E51, dibutyltin dilaurate and N,N-dimethylacetamide and polymerized to obtain a prepolymer.

[0025] (3) The prepolymer is mixed with m-phenylenediamine, and hydrophilic polyurethane is obtained after the reaction is completed.

[0026] (4) The above-mentioned hydrophilic polyurethane is coated on the substrate, soaked in water, dried, and soaked in water again to obtain an underwater antifouling coating.

[0027] Test Example 1 Using the preparation method of Example 1, underwater antifouling functional coatings were applied to substrates made of tinplate, aluminum, steel, polypropylene (PP), and polyethylene terephthalate (PET), with a coating thickness of 100 micrometers.

[0028] The coating on the steel is scraped off with a spatula, and the coated substrate is folded with pliers. The result is as follows: Figure 1 As shown, this demonstrates that the coating exhibits strong adhesion and resistance to scratches and abrasion.

[0029] The adhesion of underwater antifouling coatings on various substrates, such as Figure 2 As shown, the underwater adhesion stability is as follows: Figure 3 As shown, this demonstrates that the coating has a strong adhesion of 2-5 MPa to various substrates, and its underwater adhesion fluctuates slightly in the first 10 days, then gradually decreases and tends to stabilize.

[0030] Underwater antifouling coatings possess superhydrophobic properties, such as... Figure 4 As shown, the sliding angle is only 2° for hexadecane (density < water) and only 5° for diiodomethane (density > water), both of which allow for relative sliding. Regardless of the liquid density, they exhibit a near-complete non-wetting state. Therefore, liquids roll off the coating, carrying away contaminants and providing a self-cleaning effect. Simultaneously, it reduces the contact between the liquid and the substrate, creating a corrosion barrier. Combined with... Figure 5 It can be seen that the coating maintains good hydrophobic properties after immersion in solutions with a pH range of 1-14 for 12 hours, achieving environmentally adaptive hydrophobicity. The results after immersion in artificial seawater for 27 days are as follows... Figure 6 As shown, the contact angle remains stable at approximately 150°-160°, indicating excellent long-term resistance to seawater erosion and suitability for antifouling in marine environments; it also exhibits good defouling ability underwater. The coating demonstrates good antifouling capabilities, such as... Figure 7 and Figure 9 As shown, the coating exhibits excellent resistance to crude oil adhesion underwater. When applied to pipelines, it can also keep the inside of the pipe clean. When applied to goggles, it can keep the lens surface clean. Figure 8As shown, the coating has high transparency, which allows it to be applied in more fields.

[0031] Example 2 This embodiment provides an underwater antifouling and anticorrosion functional coating, comprising the following components by weight: 100 parts polyethylene glycol, 160 parts polytetrahydrofuran, 2 parts dibutyltin dilaurate, 100 parts m-phenylenediamine, 100 parts E51, 110 parts IPDI, 1000 parts N,N-dimethylacetamide, 10000 parts DER331, and 4000 parts T31.

[0032] This embodiment also provides a method for preparing the above-mentioned underwater antifouling and anticorrosion functional coating, including the following steps: (1) Polyethylene glycol and polytetrahydrofuran were distilled under reduced pressure.

[0033] (2) Polyethylene glycol and polytetrahydrofuran after vacuum distillation are mixed with IPDI, E51, butyltin dilaurate and N,N-dimethylacetamide and polymerized to obtain a prepolymer.

[0034] (3) The prepolymer is mixed with m-phenylenediamine, and hydrophilic polyurethane is obtained after the reaction is completed.

[0035] (4) The above-mentioned hydrophilic polyurethane was blended with DER331 and then added to T31 to obtain a coating polymer. The coating polymer prepared in Example 2 was coated on the substrate, soaked in water, dried, and soaked in water again to obtain an underwater antifouling and anticorrosion functional coating.

[0036] Test Example 2 Using the preparation method of Example 2, underwater antifouling and anticorrosion functional coatings were applied to substrates made of tin, aluminum, steel, polypropylene (PP), and polyethylene terephthalate (PET), with a coating thickness of 100 micrometers.

[0037] The adhesion of the coating on tinplate was tested after immersion in different liquid environments for 12 hours, and the results are as follows: Figure 11 As shown, this demonstrates that the coating exhibits solvent resistance and strong adhesion. Figure 12 The image shows the before and after effects of boiling the coating on a steel sheet at 100°C for 12 hours. The results indicate that the coating has good thermal stability and overall durability.

[0038] The adhesion of underwater antifouling and anticorrosion functional coatings and pure epoxy coatings on various substrates, such as Figure 13 As shown, the underwater adhesion stability is as follows: Figure 14 As shown, this demonstrates that the coating exhibits strong adhesion of 3-12 MPa to various substrates, and its underwater adhesion fluctuates slightly within the first 15 days before gradually stabilizing.

[0039] Underwater antifouling and anticorrosion coatings possess superhydrophobic properties, such as... Figure 16 As shown, the sliding angle is only 4° for hexadecane (density < water) and only 6° for diiodomethane (density > water). Relative sliding can occur in both cases, and regardless of the liquid density, the coating exhibits near-complete non-wetting. Therefore, liquids roll off the coating, carrying away contaminants and providing a self-cleaning effect. Simultaneously, it reduces the contact between the liquid and the substrate, creating a corrosion barrier. Combined with... Figure 17-18 It is evident that the coating maintains good hydrophobic properties after immersion in solutions with pH values ​​ranging from 1 to 14 for one month, demonstrating environmentally adaptive hydrophobicity. After immersion in artificial seawater for 31 days, the contact angle stabilized at approximately 160°, indicating excellent long-term resistance to seawater erosion and suitability for antifouling in marine environments; it also exhibits good defouling capabilities underwater. The coating demonstrates good antifouling performance, such as... Figure 19 As shown, the coating exhibits good anti-crude oil adhesion capabilities underwater. Figure 20 As shown, this coating offers significantly improved transparency compared to a pure epoxy coating. Figure 21 As shown, this coating has a good anti-adhesion effect on crude oil when applied to small boats.

[0040] Example 3 This embodiment provides an underwater antifouling and anticorrosion functional coating, comprising the following components by weight: 100 parts polyethylene glycol diglycidyl ether, 100 parts polytetrahydrofuran, 1 part stannous octoate, 100 parts polyetheramine, 100 parts E44, 100 parts TDI, 1000 parts N,N-dimethylformamide, 8000 parts E55, and 2000 parts 1618.

[0041] This embodiment also provides a method for preparing the above-mentioned underwater antifouling and anticorrosion functional coating, including the following steps: (1) Polyethylene glycol diglycidyl ether and polytetrahydrofuran were distilled under reduced pressure.

[0042] (2) Polyethylene glycol diglycidyl ether, polytetrahydrofuran, TDI, E44, stannous octoate and N,N-dimethylformamide after vacuum distillation are mixed evenly and polymerized to obtain a prepolymer.

[0043] (3) Mix the prepolymer with polyetheramine and obtain hydrophilic polyurethane after the reaction is complete.

[0044] (4) The above-mentioned hydrophilic polyurethane was blended with E55 and then 1618 was added to obtain a coating polymer. The coating polymer prepared in Example 3 was coated on the substrate, soaked in water, dried, and soaked in water again to obtain an underwater antifouling and anticorrosion functional coating.

[0045] Example 4 This embodiment provides an underwater antifouling and anticorrosion functional coating. The components are the same as those provided in Example 2, and the preparation method is the same as that provided in Example 2. The only difference is that in step (4) of this embodiment, the mass fractions of hydrophilic polyurethane in the blend of hydrophilic polyurethane and DER331 are 0%, 4%, 6%, 8%, 10%, 12% and 15%, respectively, and the contents of the other components are adjusted accordingly.

[0046] Therefore, coatings prepared by applying the modified hydrophilic polyurethane and epoxy polymers in different proportions onto tinplate exhibit adhesion as shown in the figure. Figure 10 As shown, the results indicate that with the increase of the mass fraction of hydrophilic polyurethane, the adhesion of the coating first increases and then tends to stabilize. When the mass fraction of polyurethane is around 10%, the shear force of the coating reaches its maximum value, approximately 11 MPa, at which point the coating adhesion is optimal. The oleophobicity is as follows... Figure 15 As shown, hydrophilic polyurethane significantly improves the oleophobic properties of the coating, with the underwater oil contact angle significantly increased to approximately 160 degrees.

[0047] Example 5 This embodiment provides an underwater antifouling and anticorrosion functional coating, comprising the following components by weight: 300 parts polyethylene glycol diglycidyl ether, 500 parts polytetrahydrofuran, 10 parts stannous octoate, 200 parts polyetheramine, 300 parts E44, 200 parts TDI, 1000 parts N,N-dimethylformamide, 18000 parts E55, and 5500 parts 1618.

[0048] Therefore, this invention discloses an underwater antifouling and anticorrosion functional coating, its preparation method, and its application. The method employs mild reaction conditions and simple steps, requiring no inert gas protection. The prepared coating combines the advantages of both polyurethane and epoxy resin, not only achieving stable curing in water but also exhibiting superior underwater adhesion and long-term durability compared to pure epoxy coatings. Simultaneously, this coating effectively prevents underwater crude oil adhesion and biofouling, solving the problems of traditional coatings having limited functionality, weak underwater adhesion, or complex preparation processes.

[0049] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and does not limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An underwater antifouling and anticorrosion functional coating, characterized in that, The underwater antifouling and anticorrosion functional coating is a modified polyurethane coating polymerized from polymers. The modified polyurethane coating comprises the following components in parts by weight: 100-300 parts hydrophilic polyether monomer, 100-500 parts hydrophobic polyether monomer, 1-10 parts catalyst, 80-200 parts chain extender, 100-300 parts epoxy resin, 100-200 parts isocyanate and 1000-2000 parts hydrophilic solvent, 5000-20000 parts modified epoxy resin, and 2000-7000 parts curing agent.

2. The underwater antifouling and anticorrosion functional coating according to claim 1, characterized in that, The hydrophilic polyether monomer is at least one of polyethylene glycol, polyethylene glycol dicarboxylic acid, polyethylene glycol diglycidyl ether, polyether siloxane, and amino-terminated polyethylene glycol.

3. The underwater antifouling and anticorrosion functional coating according to claim 1, characterized in that, The hydrophobic polyether monomer is selected from at least one of polytetrahydrofuran, polypropylene glycol, polybutane glycol, and copolymers of polyethylene and polydimethylsiloxane.

4. The underwater antifouling and anticorrosion functional coating according to claim 1, characterized in that, The epoxy resin is either bisphenol A type epoxy resin or bisphenol F type epoxy resin.

5. The underwater antifouling and anticorrosion functional coating according to claim 1, characterized in that, The hydrophilic solvent is selected from at least one of N,N-dimethylacetamide, N,N-dimethylformamide and dimethyl sulfoxide, N-methylpyrrolidone, and tetrahydrofuran; The catalyst is at least one selected from triethylamine, triethylenediamine, stannous octoate, zinc naphthenate, cobalt naphthenate, lead naphthenate, 1-butylphosphonocyclopentane, dibutyltin dilaurate, N-methylmorpholine, and N-ethylmorpholine. The chain extender is at least one selected from ethylenediamine, diethylenetriamine, triethylenetetramine, isophorone diamine, m-phenylenediamine, m-phenylenediamine, diaminodiphenylmethane, and polyetheramine. The isocyanate is at least one of aliphatic isocyanate, aromatic isocyanate, and alicyclic isocyanate.

6. The underwater antifouling and anticorrosion functional coating according to claim 1, characterized in that, The curing agent is at least one of ethylenediamine, diethylenetriamine, triethylenetetramine, m-phenylenediamine, polyetheramine, phenolic amine, and modified alicyclic amine; the modified epoxy resin is at least one of bisphenol A type epoxy resin, high-purity bisphenol A diglycidyl ether, phenolic epoxy resin, and bisphenol F type epoxy resin.

7. A method for preparing an underwater antifouling and anticorrosion functional coating as described in any one of claims 1-6, characterized in that, Includes the following steps: (1) Distill the hydrophilic polyether monomer and the hydrophobic polyether monomer separately under reduced pressure; (2) The hydrophilic polyether monomer and hydrophobic polyether monomer after vacuum distillation are mixed evenly with isocyanate, epoxy resin, catalyst and hydrophilic solvent, and the polymerization reaction is carried out to obtain the prepolymer; (3) The prepolymer is mixed with the chain extender, and hydrophilic polyurethane is obtained after the reaction is completed; (4) The above-mentioned hydrophilic polyurethane is blended with the modified epoxy resin and a curing agent is added to obtain a coating polymer, which is then coated on the substrate, soaked in water, dried, and soaked in water again to obtain an underwater antifouling and anticorrosion functional coating.

8. The method for preparing an underwater antifouling and anticorrosion functional coating according to claim 7, characterized in that, In step (1), the vacuum distillation temperature is 90-130℃ and the reaction time is 2-4 hours; in step (2), the polymerization reaction temperature is 50-80℃ and the reaction time is 2-8 hours; in step (3), the mixing temperature is 15-35℃ and the reaction time is 0.5-4h; in step (4), the drying temperature is 60-90℃ and the drying time is 1-4h.

9. The method for preparing an underwater antifouling and anticorrosion functional coating according to claim 7, characterized in that, In step (4), the mass fraction of hydrophilic polyurethane in the coating polymer is 4%-20%.

10. The application of an underwater antifouling and anticorrosion functional coating as described in any one of claims 1-6, characterized in that, The underwater antifouling and anticorrosion functional coating is applied to the surface of a substrate that is immersed in water. It is applied to the surface of the substrate in the air, and then dried and soaked in water again.

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