An underwater antifouling and anticorrosion functional coating as well as a preparation method and application thereof

Abstract

The application discloses an underwater antifouling and anticorrosion functional coating as well as a preparation method and application thereof, and relates to the technical field of coating materials.The underwater antifouling and anticorrosion functional coating comprises the following components: a hydrophilic polyether monomer, a hydrophobic polyether monomer, a catalyst, a chain extender, an epoxy resin, an isocyanate, a hydrophilic solvent, a modified epoxy resin and a curing agent.The method has mild reaction conditions and simple steps, and does not need inert gas protection.The prepared coating has the advantages of polyurethane and epoxy resin, can be stably cured in water, and has better underwater adhesion and long-term durability than a pure epoxy coating.Meanwhile, the coating can effectively prevent underwater crude oil adhesion and biological fouling, and solves the problems of single function, weak underwater adhesion or complex preparation process of a traditional coating.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coating materials, in particular to an underwater antifouling and anticorrosion functional coating and a preparation method and application thereof. BACKGROUND

[0002] Underwater facilities such as marine engineering equipment and ships are long-term served in harsh corrosive and biofouling environments, and their surface protection depends on coatings with excellent anticorrosion and antifouling functions. However, traditional single-property coatings are difficult to cope with this dual challenge, and the development of integrated coating systems is of great significance to prolong the service life of facilities, reduce maintenance costs and reduce environmental pollution.

[0003] Existing coating technologies have obvious limitations. On the one hand, ordinary hydrogel or hydrophilic polyurethane coatings can slow down bioattachment to some extent through the surface hydration layer, but their loose crosslinked network and low modulus result in serious lack of adhesion and mechanical strength under water, and they are prone to peeling off, and their anticorrosion performance can be ignored. On the other hand, traditional epoxy resin coatings have become the cornerstone in the field of corrosion protection due to their excellent adhesion, high crosslinking density and excellent shielding property, but their surface is hard and hydrophobic, which is easily attached by organisms or stains, and may be plasticized or hydrolyzed after long-term immersion, resulting in decreased water resistance and loss of protection. More troublesome is that the existing coatings that have both the above advantages often involve multi-step complex reactions, harsh synthesis conditions or the use of expensive special raw materials, which face great obstacles in process repeatability, cost control and large-scale production, greatly limiting their practical application. SUMMARY

[0004] The purpose of the present application is to provide an underwater antifouling and anticorrosion functional coating and a preparation method and application thereof. The reaction conditions of the method are mild, the steps are simple, and inert gas protection is not required. The prepared coating has the advantages of both polyurethane and epoxy resin, not only can be stably cured in water, but also exhibits better underwater adhesion and long-term durability than pure epoxy coatings. At the same time, the coating can effectively prevent underwater crude oil adhesion and biofouling, solving the problems of single function, weak underwater adhesion or complex preparation process of traditional coatings.

[0005] In order to achieve the above purpose, the present application discloses an underwater antifouling and anticorrosion functional coating, which is a modified polyurethane coating prepared by polymerization, and comprises the following components in parts by weight: 100-300 parts of a hydrophilic polyether monomer, 100-500 parts of a hydrophobic polyether monomer, 1-10 parts of a catalyst, 80-200 parts of a chain extender, 100-300 parts of an epoxy resin, 100-200 parts of an isocyanate, and 1000-2000 parts of a hydrophilic solvent, 5000-20000 parts of a modified epoxy resin, and 2000-7000 parts of a curing agent.

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

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

[0008] Preferably, the epoxy resin is at least one of bisphenol A type epoxy resin or 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 at least one of N,N-dimethylacetamide, N,N-dimethylformamide, and dimethyl sulfoxide, N-methyl pyrrolidone, and tetrahydrofuran.

[0010] The catalyst is at least one of triethylamine, triethylenediamine, stannous octoate, zinc naphthenate, cobalt / lead naphthenate, 1-butylphospholane, dibutyltin dilaurate, N-methylmorpholine, and N-ethylmorpholine.

[0011] The chain extender is at least one of ethylenediamine, diethylenetriamine, triethylenetetramine, isophorone diamine, m-phenylenediamine, m-xylylenediamine, diaminodiphenylmethane, and polyether amine.

[0012] The isocyanate is at least one of aliphatic isocyanate, aromatic isocyanate, and alicyclic isocyanate, and preferably the isocyanate is at least one of PDI, NDI, NBDI, PPDI, TDI, HMDI, IPDI, HDI, XDI, TMXDI, and CHDI.

[0013] Preferably, the curing agent is at least one of ethylenediamine, diethylenetriamine, triethylenetetramine, m-xylylenediamine, polyether amine, phenalkamine (T31), and modified alicyclic amine (1618), and 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, and specifically is at least one of DER331, DER332, DER332, E55, E51, E12, F-51, and YDF-170.

[0014] The application also provides a preparation method of the underwater antifouling and anticorrosion functional coating.

[0015] (1) The hydrophilic polyether monomer and the hydrophobic polyether monomer are separately distilled under reduced pressure.

[0016] (2) mixing the hydrophilic polyether monomer, the hydrophobic polyether monomer, the isocyanate, the epoxy resin, the catalyst and the hydrophilic solvent after the reduced pressure distillation to obtain a prepolymer through polymerization reaction;

[0017] (3) mixing the prepolymer with a chain extender, and obtaining the hydrophilic polyurethane after the reaction is completed, and obtaining the coating polymer by preparing the hydrophilic polyurethane, and coating the coating polymer on the substrate to obtain the underwater antifouling functional coating.

[0018] (4) obtaining the coating polymer by mixing the hydrophilic polyurethane with the modified epoxy resin and adding the amine curing agent, coating the coating polymer on the substrate, soaking in water, drying, and soaking in water again to obtain the underwater antifouling and corrosion-resistant functional coating.

[0019] Preferably, the reduced pressure distillation temperature in step (1) is 90-130 DEG C, and the reaction time is 2-4 hours; the polymerization reaction temperature in step (2) is 50-80 DEG C, and the reaction time is 2-8 hours; the mixing temperature in step (3) is 15-35 DEG C, and the reaction time is 0.5-4 hours; and the drying temperature in step (4) is 60-90 DEG C, and the drying time is 1-4 hours.

[0020] Preferably, the mass fraction of the hydrophilic polyurethane in the coating polymer in step (4) is 4%-20%.

[0021] The underwater antifouling and corrosion-resistant functional coating provided by the application is applied to the surface of the substrate soaked in water, coated on the surface of the substrate in air, dried after soaking in water, and soaked in water again.

[0022] Therefore, the underwater antifouling and corrosion-resistant functional coating, the preparation method and the application thereof have the following beneficial effects:

[0023] (1) The functional coating aims to solve the important demand for material surface protection in the marine environment. After the coating is coated and soaked in water, the hydrophilic polyether chain segment migrates to the surface of the coating, forms a firm hydration layer on the surface of the substrate, can effectively prevent various oil substances such as crude oil from adhering, achieves the effect of antifouling, the hydrophobic polyether chain segment provides a flexible chain segment, improves the stability of the coating, the introduction of the epoxy resin and the hydrophobic effect make the coating have better adhesion to the substrate, the coating is more dense, can make the coating adhere stably and strongly for a long time under water, and the dense network and the hydrophobic effect can effectively prevent seawater and the like from corroding the substrate below the coating. The hydrophilic polyurethane is added into the modified epoxy resin (system) and the curing agent, so that the obtained coating does not form wrinkles on the surface when soaked in water like a pure hydrophilic polyurethane coating; at the same time, the coating can also obtain higher hardness and stronger adhesion.

[0024] (2) The present application is synthesized by "prepolymer method" and "soaking-drying-soaking again" post-processing technology, which is mild without inert gas protection, effectively induces the formation of hydrophilic / hydrophobic microphase separation structure, so that the coating can quickly form and long-term maintain stable, strong adhesion and comprehensive protection performance in underwater environment. The method successfully prepares a high-performance coating which integrates strong adhesion, excellent corrosion resistance, active antifouling and anti-oil adhesion, and perfectly solves the multiple defects of the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the adhesion scratch result diagram of the underwater antifouling functional coating, wherein a is the scratch result diagram, and b is the folding result diagram;

[0026] Figure 2 is the adhesion of the underwater antifouling functional coating on various substrates;

[0027] Figure 3 is the underwater adhesion stability of the underwater antifouling functional coating on various substrates;

[0028] Figure 4 is the underwater oil drop sliding performance diagram of the underwater antifouling functional coating;

[0029] Figure 5 is the liquid-repellent performance diagram of the underwater antifouling functional coating after being soaked in different pH solutions for 12 hours;

[0030] Figure 6 is the liquid-repellent performance diagram of the underwater antifouling functional coating after being soaked in seawater for 30 days;

[0031] Figure 7 is the self-cleaning ability diagram of the underwater antifouling functional coating to crude oil underwater;

[0032] Figure 8 is the high transparency diagram of the underwater antifouling functional coating;

[0033] Figure 9 is the antifouling effect diagram of the underwater antifouling functional coating on pipelines and goggles, wherein a is the pipeline effect diagram, and b is the goggles effect diagram;

[0034] Figure 10 is the adhesion diagram of the hydrophilic polyurethane and epoxy after being modified by blending at different proportions on tinplate;

[0035] Figure 11 is the adhesion diagram of the underwater antifouling and corrosion-resistant functional coating to tinplate after being soaked in different liquid environments for 12 hours;

[0036] Figure 12 is the effect diagram of the underwater antifouling and corrosion-resistant functional coating before and after being boiled in water at 100 DEG C for 12 hours;

[0037] Figure 13 The adhesion performance chart of the underwater antifouling and anticorrosion functional coating and the pure epoxy coating on various substrates;

[0038] Figure 14 The underwater adhesion stability of the underwater antifouling and anticorrosion functional coating on various substrates;

[0039] Figure 15 The oil-repellent ability chart of the hydrophilic polyurethane and the epoxy blended and modified at different proportions;

[0040] Figure 16 The underwater oil drop sliding performance chart of the underwater antifouling and anticorrosion functional coating;

[0041] Figure 17 The liquid-repellent performance chart of the underwater antifouling and anticorrosion functional coating after being soaked in different pH solutions for one month;

[0042] Figure 18 The liquid-repellent performance chart of the underwater antifouling and anticorrosion functional coating after being soaked in seawater for 30 days;

[0043] Figure 19 The self-cleaning ability chart of the underwater antifouling and anticorrosion functional coating to crude oil under water;

[0044] Figure 20 The transparency comparison chart of the underwater antifouling and anticorrosion functional coating and the pure epoxy coating;

[0045] Figure 21 The antifouling effect chart of the underwater antifouling and anticorrosion functional coating applied to a small boat to crude oil under water, wherein a is a small boat on the surface of crude oil, b is the antifouling of the bottom of the boat with the coating, and c is the non-antifouling of the bottom of the boat without the coating. DETAILED DESCRIPTION

[0046] The technical solutions of the present application are further described below by means of the accompanying drawings and examples.

[0047] Unless otherwise defined, the technical terms or scientific terms used in the present application shall be understood as the usual meanings understood by those skilled in the art to which the present application belongs.

[0048] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not contain only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each example can also be appropriately combined to form other embodiments which can be understood by those skilled in the art. These other embodiments are also covered by the protection scope of the present application.

[0049] Example 1

[0050] 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.

[0051] This embodiment also provides a method for preparing the above-mentioned underwater antifouling and anticorrosion functional coating, including the following steps:

[0052] (1) Polyethylene glycol and polytetrahydrofuran were distilled under reduced pressure.

[0053] (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.

[0054] (3) The prepolymer is mixed with m-phenylenediamine, and hydrophilic polyurethane is obtained after the reaction is completed.

[0055] (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.

[0056] Test Example 1

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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 5It can be seen that the coating still has good liquid-repellent function after being soaked in a solution with pH of 1-14 for 12 hours, and can realize environmental self-adaptation liquid-repellent. The results of soaking in artificial seawater for 27 days are shown in Figure 6 , the contact angle is stable at about 150°-160°, indicating that it has excellent long-term resistance to seawater erosion and is suitable for marine environment antifouling; and has good decontamination ability under water. The coating has good antifouling ability, as shown in Figure 7 and Figure 9 , the coating has good resistance to crude oil adhesion under water, and if the coating is applied to a pipeline, the inside of the pipeline can also be kept clean. If it is applied to goggles, the mirror surface can be kept clean. As shown in Figure 8 , the coating has high transparency, so it can be applied in more fields.

[0061] Example 2

[0062] The embodiment provides an underwater antifouling and corrosion-resistant functional coating, which comprises the following components in parts by weight: 100 parts of polyethylene glycol, 160 parts of polytetrahydrofuran, 2 parts of dibutyltin dilaurate, 100 parts of m-phenylenediamine, 100 parts of E51, 110 parts of IPDI and 1000 parts of N,N-dimethylacetamide, 10000 parts of DER331 and 4000 parts of T31.

[0063] The embodiment also provides a preparation method for preparing the above-mentioned underwater antifouling and corrosion-resistant functional coating, which comprises the following steps:

[0064] (1) The polyethylene glycol and the polytetrahydrofuran are separately distilled under reduced pressure.

[0065] (2) The polyethylene glycol and the polytetrahydrofuran after being distilled under reduced pressure are uniformly mixed with the IPDI, the E51, the butyltin dilaurate and the N,N-dimethylacetamide, and a prepolymer is obtained through polymerization reaction.

[0066] (3) The prepolymer is mixed with the m-phenylenediamine, and a hydrophilic polyurethane is obtained after the reaction is completed.

[0067] (4) The hydrophilic polyurethane is blended with the DER331, and then the T31 is added to obtain a coating polymer. The coating polymer prepared in Example 2 is coated on a substrate, soaked in water, dried, and then soaked in water again to obtain an underwater antifouling and corrosion-resistant functional coating.

[0068] Test Example 2

[0069] The underwater antifouling and corrosion-resistant functional coating is coated on substrates made of tin (Tin), aluminum (Al), steel (Steel), polypropylene (PP) and polyethylene terephthalate (PET) respectively by using the preparation method of Example 2, and the coating thickness is 100 microns.

[0070] The adhesion of the coating on tinplate was tested after immersion in different liquid environments for 12 h, and the results, as shown in Figure 11 , proved that the coating had solvent resistance and strong adhesion. The before-and-after effect pictures of the coating on steel sheets after boiling in water at 100 ℃ for 12 h, as shown in Figure 12 , showed that the coating had good thermal stability and comprehensive durability.

[0071] The adhesion of the underwater antifouling and anticorrosion functional coating and the pure epoxy coating on various substrates was as shown in Figure 13 , and the underwater adhesion stability was as shown in Figure 14 , which proved that the coating had strong adhesion of 3-12 MPa to various substrates, and the adhesion fluctuated slightly within the first 15 days under water, and then gradually stabilized.

[0072] The underwater antifouling and anticorrosion functional coating had super-liquid-repellent properties, as shown in Figure 16 , the sliding angle of n-hexadecane (density < water) was only 4°, and the sliding angle of diiodomethane (density > water) was only 6°, and both could produce relative sliding, regardless of the density of the liquid, and presented a nearly completely non-wetting state, so that the liquid rolling on the coating could take away the pollutants, had a self-cleaning effect, and could reduce the contact between the liquid and the substrate to produce an anticorrosion barrier. It can be seen from Figure 17-18 that the coating still had good liquid-repellent function after immersion in a solution with a pH of 1-14 for one month, and could realize environmental self-adaptive liquid repellency. After immersion in artificial seawater for 31 days, the contact angle was stabilized at about 160°, indicating that it had excellent long-term seawater erosion resistance and was suitable for marine environment antifouling; and had good decontamination ability under water. The coating had good antifouling ability, as shown in Figure 19 , and had good resistance to crude oil adhesion under water. As shown in Figure 20 , the coating had greater improvement in transparency compared with the pure epoxy coating. As shown in Figure 21 , the coating had good resistance to crude oil adhesion when applied to a small boat.

[0073] Example 3

[0074] The underwater antifouling and anticorrosion functional coating provided in this example comprises the following components in parts by weight: 100 parts of polyethylene glycol diglycidyl ether, 100 parts of polytetrahydrofuran, 1 part of stannous octoate, 100 parts of polyether amine, 100 parts of E44, 100 parts of TDI, and 1000 parts of N,N-dimethylformamide, 8000 parts of E55, and 2000 parts of 1618.

[0075] The preparation method for preparing the above-mentioned underwater antifouling and anticorrosion functional coating comprises the following steps:

[0076] (1) Polyethylene glycol diglycidyl ether and polytetrahydrofuran are distilled under reduced pressure respectively.

[0077] (2) The polyethylene glycol diglycidyl ether and polytetrahydrofuran distilled under reduced pressure are mixed with TDI, E44, stannous octoate and N,N-dimethylformamide to obtain a prepolymer by polymerization.

[0078] (3) The prepolymer is mixed with polyether amine, and a hydrophilic polyurethane is obtained after the reaction is completed.

[0079] (4) The hydrophilic polyurethane is blended with E55, and then 1618 is added to obtain a coating polymer. The coating polymer prepared in Example 3 is coated on a substrate, soaked in water, dried, and then soaked in water again to obtain an underwater antifouling and corrosion-resistant functional coating.

[0080] Example 4

[0081] The underwater antifouling and corrosion-resistant functional coating provided in this example has the same components and preparation method as those provided in Example 2, and the only difference is that in step (4) of this example, the mass fraction of the hydrophilic polyurethane in the hydrophilic polyurethane and DER331 blend is 0%, 4%, 6%, 8%, 10%, 12% and 15% respectively, and the content of the remaining components is adjusted adaptively.

[0082] Therefore, the coating polymer modified by blending the hydrophilic polyurethane and the epoxy at different proportions is coated on tinplate to obtain a coating, and the adhesion is as shown in Figure 10 The results show that as the mass fraction of the hydrophilic polyurethane increases, the adhesion of the coating first increases and then tends to be stable, and when the mass fraction of the polyurethane is about 10%, the shear force of the coating reaches a maximum value of about 11 MPa, and at this time, the adhesion of the coating is best. Figure 15 The results show that the hydrophilic polyurethane has a significant improvement on the oil-repellent performance of the coating, and the underwater oil contact angle is significantly improved to about 160 degrees.

[0083] Example 5

[0084] The underwater antifouling and corrosion-resistant functional coating provided in this example comprises the following components by weight: 300 parts of polyethylene glycol diglycidyl ether, 500 parts of polytetrahydrofuran, 10 parts of stannous octoate, 200 parts of polyether amine, 300 parts of E44, 200 parts of TDI and 1000 parts of N,N-dimethylformamide, 18000 parts of E55 and 5500 parts of 1618.

[0085] Therefore, the application discloses an underwater antifouling and anticorrosion functional coating as well as a preparation method and application thereof. The method has mild reaction conditions and simple steps, and does not need inert gas protection. The prepared coating has the advantages of polyurethane and epoxy resin, can be stably cured in water, and has better underwater adhesion and long-term durability than a pure epoxy coating. Meanwhile, the coating can effectively prevent underwater crude oil adhesion and biological fouling, and solves the problems of single function, weak underwater adhesion or complex preparation process of a traditional coating.

[0086] The above specific embodiments further explain the purposes, technical solutions and advantages of the application. It should be understood that the above description is only a specific embodiment of the application, and does not limit the protection scope of the application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. An underwater antifouling and anticorrosion functional coating, characterized by, The underwater antifouling and anticorrosion functional coating is a modified polyurethane coating polymerized, and the modified polyurethane coating comprises the following raw materials in parts by weight: 100-300 parts of hydrophilic polyether monomer, 100-500 parts of hydrophobic polyether monomer, 1-10 parts of catalyst, 80-200 parts of chain extender, 100-300 parts of epoxy resin, 100-200 parts of isocyanate and 1000-2000 parts of hydrophilic solvent, 5000-20000 parts of modified epoxy resin, and 2000-7000 parts of curing agent. The hydrophilic solvent is at least one of N,N-dimethylacetamide, N,N-dimethylformamide and dimethyl sulfoxide, N-methyl pyrrolidone and tetrahydrofuran. The chain extender is at least one of ethylenediamine, diethylenetriamine, triethylenetetramine, isophorone diamine, m-phenylenediamine, m-xylylenediamine, diaminodiphenylmethane and polyether amine. The hydrophilic polyether monomer is at least one of polyethylene glycol, polyethylene glycol bix-carboxylic acid, polyethylene glycol diglycidyl ether, polyether siloxane and amino-terminated polyethylene glycol. The hydrophobic polyether monomer is at least one of polytetrahydrofuran, polypropylene oxide glycol and polybutylene oxide glycol. The preparation method of the underwater antifouling and anticorrosion functional coating comprises the following steps: (1) The hydrophilic polyether monomer and the hydrophobic polyether monomer are separately distilled under reduced pressure; (2) The hydrophilic polyether monomer and the hydrophobic polyether monomer after the reduced-pressure distillation are mixed with the isocyanate, the epoxy resin, the catalyst and the hydrophilic solvent to obtain a prepolymer through polymerization reaction; (3) The prepolymer is mixed with the chain extender, and the hydrophilic polyurethane is obtained after the reaction is completed; (4) The hydrophilic polyurethane is blended with the modified epoxy resin, and the curing agent is added to obtain a coating polymer, which is coated on a substrate, soaked in water, dried, soaked in water again, and then an underwater antifouling and anticorrosion functional coating is obtained; In step (4), the mass fraction of the hydrophilic polyurethane in the coating polymer is 4%-20%.

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

3. The underwater antifouling and anticorrosion functional coating according to claim 1, characterized in that, The catalyst is at least one of triethylamine, triethylenediamine, stannous octoate, zinc naphthenate, cobalt naphthenate, lead naphthenate, 1-butylphospholane, dibutyltin dilaurate, N-methylmorpholine and N-ethylmorpholine.

4. The underwater antifouling and anticorrosion functional coating according to claim 1, characterized in that, The isocyanate is at least one of aliphatic isocyanate, aromatic isocyanate and alicyclic isocyanate.

5. 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-xylylenediamine, polyether amine, phenolic amine and denatured alicyclic amine; and the modified epoxy resin is at least one of a bisphenol A type epoxy resin, a phenolic epoxy resin and a bisphenol F type epoxy resin.

6. A method for producing the underwater antifouling and anticorrosion functional coating according to any one of claims 1 to 5, characterized by, The preparation method comprises the following steps: (1) The hydrophilic polyether monomer and the hydrophobic polyether monomer are separately distilled under reduced pressure; (2) The hydrophilic polyether monomer and the hydrophobic polyether monomer after the reduced-pressure distillation are mixed with the isocyanate, the epoxy resin, the catalyst and the hydrophilic solvent to obtain a prepolymer through polymerization reaction; (3) The prepolymer is mixed with the chain extender, and the hydrophilic polyurethane is obtained after the reaction is completed; (4) The hydrophilic polyurethane is blended with the modified epoxy resin, and the curing agent is added to obtain a coating polymer, which is coated on a substrate, soaked in water, dried, soaked in water again, and then an underwater antifouling and anticorrosion functional coating is obtained; (4) The hydrophilic polyurethane is blended with the modified epoxy resin, a curing agent is added to obtain a coating polymer, which is coated on a substrate, soaked in water, dried, and soaked in water again to obtain an underwater antifouling and anticorrosion functional coating.

7. The method according to claim 6, wherein the method is characterized by, The temperature of the reduced pressure distillation in step (1) is 90-130 DEG C; the temperature of the polymerization reaction in step (2) is 50-80 DEG C, and the reaction time is 2-8 hours; in step (3), the mixing temperature is 15-35 DEG C, and the reaction time is 0.5-4 hours; in step (4), the drying temperature is 60-90 DEG C, and the drying time is 1-4 hours.

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