Epoxy heavy-duty anticorrosive coating for marine splash zone and preparation method thereof

Abstract

This invention relates to the field of anti-corrosion coating technology, and discloses an epoxy heavy-duty anti-corrosion coating for marine splash zones and its preparation method. The epoxy heavy-duty anti-corrosion coating for marine splash zones comprises component A and component B in a weight ratio of 3-6:1. By weight, component A comprises 30-50 parts of bisphenol A type epoxy resin, 2-8 parts of petroleum resin, 0.5-2 parts of thixotropic agent, 3-8 parts of pigment, 20-50 parts of filler, 0.5-1.5 parts of silane coupling agent, 1-3 parts of reactive diluent, 3-10 parts of first solvent, and 0.2-0.5 parts of leveling agent. By weight, component B comprises 20-40 parts of an amine composite curing agent prepolymer synthesized from polyamide resin and bisphenol F epoxy resin, 20-40 parts of amine curing agent, 20-50 parts of second solvent, 2-5 parts of accelerator, and 1-2 parts of defoamer. Epoxy heavy-duty anti-corrosion coatings have excellent anti-foaming and other properties, and good recoatability and workability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anticorrosive paint, in particular to an epoxy heavy-duty anticorrosive paint for marine splash zone and a preparation method thereof. BACKGROUND

[0002] According to the different exposure conditions of marine steel structures, the marine corrosion environment can be divided into five zones, namely marine atmospheric zone, splash zone, tidal zone, fully immersed zone and seabed soil zone. The marine splash zone is the most serious corrosion area among the five corrosion zones, has a similar external environment as the atmospheric zone, the steel surface is periodically wetted by seawater, is in a dry-wet alternating state, oxygen supply is sufficient, salt is continuously concentrated, and the most serious corrosion occurs due to the synergistic effect of sunlight, wind blowing and seawater environment.

[0003] The anticorrosive paint is a representative anticorrosion method for the splash zone, and the commonly used paints in the splash zone are epoxy primer + thick film type epoxy glass flake coating, inorganic zinc-rich + high-strength epoxy coating, inorganic zinc-rich + epoxy powder coating and the like thick film coating. The anticorrosive paint is completely covered on the surface of the steel by a coating process to form a protective, decorative and anticorrosive film covering layer. In the marine environment, the surface of the steel often has several coatings to form an overall system coating (including primer, intermediate layer and topcoat). In the prior art, in order to enhance the anticorrosion performance of the coating, phosphate is usually used as a corrosion inhibitor, but the phosphate epoxy system product coating does not have long-term anti-bubbling ability; or a hydrophobic capillary structure with a sharp surface is formed in the coating, but it must be recoated before the organic coating is not tack-free, otherwise the surface of the organic layer needs to be sanded before recoating, and the coating is brushed, the construction range is narrow, and engineering application is not possible. SUMMARY

[0004] Based on the above, the purpose of the present application is to provide an epoxy heavy-duty anticorrosive paint for marine splash zone and a preparation method thereof, which has good anti-bubbling performance and other properties, good recoatability and construction performance.

[0005] To achieve the above purpose, the following technical solutions are adopted:

[0006] An epoxy heavy-duty anticorrosive paint for marine splash zone, comprising A component and B component in a weight ratio of 3-6:1;

[0007] The A component comprises bisphenol A type epoxy resin 30-50 parts, petroleum resin 2-8 parts, thixotropic agent 0.5-2 parts, pigment 3-8 parts, filler 20-50 parts, silane coupling agent 0.5-1.5 parts, active diluent 1-3 parts, first solvent 3-10 parts and leveling agent 0.2-0.5 parts by weight;

[0008] By weight, component B comprises 20-40 parts of an amine composite curing agent prepolymer synthesized from polyamide resin and bisphenol F epoxy resin, 20-40 parts of an amine curing agent, 20-50 parts of a second solvent, 2-5 parts of an accelerator, and 1-2 parts of an defoamer.

[0009] As a preferred embodiment of an epoxy heavy-duty anti-corrosion coating for marine splash zones, the petroleum resin comprises liquid petroleum resin and solid petroleum resin, wherein the weight ratio of the liquid petroleum resin to the solid petroleum resin is 2:1.

[0010] As a preferred embodiment of an epoxy heavy-duty anti-corrosion coating for marine splash zones, the bisphenol A type epoxy resin includes epoxy resin E20 and epoxy resin E51.

[0011] As a preferred embodiment of an epoxy heavy-duty anti-corrosion coating for marine splash zones, the weight ratio of the bisphenol F epoxy resin to the polyamide resin is 1:5.

[0012] As a preferred embodiment of an epoxy heavy-duty anti-corrosion coating for marine splash zones, the amine curing agent comprises a modified aliphatic amine, and the weight ratio of the polyamide resin to the modified aliphatic amine is 1:1-1.5.

[0013] As a preferred option for epoxy heavy-duty anti-corrosion coatings for marine splash zones, the modified aliphatic amine includes one or more of the following: modified aliphatic amine Ancamine 2280, Cardl 5701, and Evonik epoxy curing agent Ancamine 1618.

[0014] A method for preparing an epoxy heavy-duty anti-corrosion coating includes the following steps:

[0015] Bisphenol A type epoxy resin and petroleum resin are added to the first reaction vessel. The mixture is stirred at a first preset stirring speed. Thixotropic agent is added while maintaining the stirring speed, and the mixture is stirred evenly. A preset amount of first solvent is then added.

[0016] Increase the stirring speed to the second preset stirring speed, slowly add pigments and fillers, and clean the inner wall of the first reaction vessel with a preset amount of the first solvent;

[0017] Increase the stirring speed to the third preset stirring speed, and maintain dispersion for the first preset time at the preset temperature;

[0018] Add silane coupling agent, reactive diluent, leveling agent and a preset amount of the first solvent at a fourth preset stirring degree to obtain component A;

[0019] An accelerator is added to an amine composite curing agent prepolymer synthesized from polyamide resin and bisphenol F epoxy resin. The mixture is stirred at a fifth preset speed for a second preset time to control the amine value and viscosity. Modified aliphatic amine and defoamer are added during stirring. After stirring evenly, component B is obtained.

[0020] The anti-corrosion coating is obtained by mixing component A and component B in a ratio of 3-6:1.

[0021] As a preferred method for preparing epoxy heavy-duty anti-corrosion coating, a predetermined amount of second solvent and polyamide resin are added to a second reactor and stirred at a predetermined speed. Bisphenol F resin is added during stirring. After stirring until homogeneous, the reactor is sealed and placed for a predetermined time to control the amine value and viscosity, thereby obtaining an amine composite curing agent prepolymer.

[0022] As a preferred embodiment of the preparation method of epoxy heavy-duty anti-corrosion coating, when adding bisphenol A type epoxy resin and petroleum resin, epoxy resin E20 and epoxy resin E51 are added to the first reaction vessel at a weight ratio of 1:4, and liquid petroleum resin and solid petroleum resin are added to the first reaction vessel at a weight ratio of 2:1. Then, the mixture is stirred at the first preset stirring speed until the solid petroleum resin is completely dissolved.

[0023] As a preferred embodiment of the preparation method of epoxy heavy-duty anti-corrosion coating, the first preset stirring speed is 300 rpm - 500 rpm, the second preset stirring speed is 600 rpm - 800 rpm, the third preset stirring speed is 1200 rpm - 1500 rpm, the fourth preset stirring speed is 600 rpm - 800 rpm, the first preset time is 20 min - 30 min, the preset temperature is 55℃ - 65℃, the fifth preset stirring speed is 300 rpm - 500 rpm, and the sixth preset stirring speed is 300 rpm - 500 rpm.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention provides an epoxy heavy-duty anti-corrosion coating for marine splash zones. The coating comprises component A and component B in a weight ratio of 3-6:1. By using petroleum resin, the wettability and workability of the anti-corrosion coating to the substrate are effectively improved, thereby enhancing the recoatability of the coating. By using an amine composite curing agent prepolymer synthesized from polyamide resin and bisphenol F epoxy resin, combined with an amine curing agent, the crosslinking density of the epoxy resin is increased, resulting in improved film density. This effectively increases the film-forming speed of the anti-corrosion coating and enhances its hardness, flexibility, impact resistance, salt spray resistance, seawater resistance, damp heat resistance, cathodic disbondment resistance, and cyclic aging resistance. Furthermore, it eliminates the need for functional fillers such as anti-rust pigments and hydrophobic glass flakes, thus improving the anti-foaming properties, recoatability, and workability of the anti-corrosion coating.

[0026] This invention also provides a method for preparing an epoxy heavy-duty anti-corrosion coating. By adding petroleum resin to component A, the wettability and workability of the resulting anti-corrosion coating on the substrate are improved, thereby enhancing the recoatability of the coating. By using an amine composite curing agent prepolymer synthesized from polyamide resin and bisphenol F epoxy resin in component B, combined with modified aliphatic amines, the crosslinking density of the epoxy resin is increased, and the film density is improved. This effectively increases the film-forming speed of the anti-corrosion coating, as well as the coating's hardness, flexibility, impact resistance, salt spray resistance, seawater resistance, damp heat resistance, cathodic disbondment resistance, and cyclic aging resistance. At the same time, it eliminates the need for functional fillers such as anti-rust pigments and hydrophobic glass flakes, which is beneficial for improving the anti-foaming properties, recoatability, and workability of the anti-corrosion coating. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0028] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0029] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0030] Based on the different exposure conditions of marine steel structures, the marine corrosion environment can be divided into five zones: the marine atmospheric zone, the splash zone, the tidal zone, the fully immersed zone, and the seabed mud zone. The marine splash zone is the most severely corroded of the five zones. It has an external environment similar to the atmospheric zone, where the steel surface is periodically wetted by seawater, resulting in an alternating wet and dry state. Oxygen supply is sufficient, and salt concentration is constantly increasing. Combined with the synergistic effects of sunlight, wind, and the seawater environment, this leads to the most severe corrosion.

[0031] Anti-corrosion coatings are a representative method of corrosion protection in splash zones. Commonly used coatings in splash zones include epoxy primer + thick-film epoxy glass flake coating, inorganic zinc-rich coating + high-strength epoxy coating, and inorganic zinc-rich coating + epoxy powder coating. Anti-corrosion coatings, through a coating process, completely cover the steel surface to form a thin film covering with protective, decorative, and anti-corrosion functions. In marine environments, steel surfaces often have several coatings to form a complete coating system (including primer, intermediate layer, and topcoat). In existing technologies, phosphates are commonly used as corrosion inhibitors to enhance the anti-corrosion performance of the coating. However, phosphate-epoxy system coatings lack long-term anti-blistering capabilities; alternatively, the coating may form a hydrophobic capillary structure with sharp surfaces, but recoating is necessary before the organic layer is fully dry. Otherwise, the organic layer surface needs to be sanded before recoating. Furthermore, this type of coating is applied by brush, limiting the application area and making it unsuitable for engineering applications.

[0032] To address the aforementioned problems, this embodiment provides an epoxy heavy-duty anti-corrosion coating for marine splash zones. This coating comprises component A and component B in a weight ratio of 3-6:1. Component A, by weight, includes 30-50 parts bisphenol A epoxy resin, 2-8 parts petroleum resin, 0.5-2 parts thixotropic agent, 3-8 parts pigment, 20-50 parts filler, 0.5-1.5 parts silane coupling agent, 1-3 parts reactive diluent, 3-10 parts first solvent, and 0.2-0.5 parts leveling agent. Component B, by weight, includes 20-40 parts an amine composite curing agent prepolymer synthesized from polyamide resin and bisphenol F epoxy resin, 20-40 parts amine curing agent, 20-50 parts second solvent, 2-5 parts accelerator, and 1-2 parts defoamer. By using petroleum resin, the wettability and workability of anti-corrosion coatings to substrates can be effectively improved, thereby enhancing the recoatability of the coating. By using an amine composite curing agent prepolymer synthesized from polyamide resin and bisphenol F epoxy resin, combined with an amine curing agent, the crosslinking density of the epoxy resin is increased, leading to improved film density. This effectively increases the film-forming speed of the anti-corrosion coating, enhancing its hardness, flexibility, impact resistance, salt spray resistance, seawater resistance, damp heat resistance, cathodic disbondment resistance, and cyclic aging resistance. Furthermore, it eliminates the need for functional fillers such as rust-preventive pigments and hydrophobic glass flakes, thus improving the anti-foaming properties, recoatability, and workability of the anti-corrosion coating.

[0033] For example, component A may include 30, 40, or 50 parts of bisphenol A type epoxy resin, 2, 3, 5, 7, or 8 parts of petroleum resin, 0.5, 1, 1.5, or 2 parts of thixotropic agent, 3, 4, 5, 6, 7, or 8 parts of pigment, 20, 30, 40, or 50 parts of filler, 0.5, 1, or 1.5 parts of silane coupling agent, 1, 2, or 3 parts of reactive diluent, 3, 5, 7, or 10 parts of first solvent, and 0.2, 0.3, 0.4, or 0.5 parts of leveling agent, depending on the actual situation. Component B includes 20, 30, or 40 parts of amine composite curing agent prepolymer, 20, 30, or 40 parts of amine curing agent, 20, 30, 40, or 50 parts of second solvent, 2, 3, 4, or 5 parts of accelerator, and 1 or 2 parts of defoamer, depending on the actual situation.

[0034] The thixotropic agent is one or a combination of several of the following: polyamide wax powder DISPARLON 6650, CRAYVALLAC ULTRA, amide-modified wax powder THIXATROL ST, CRAYVALLAC MT, bentonite BENTONE SD-2, and Degussa R972, with a preferred combination of CRAYVALLAC ULTRA and bentonite BENTONE SD-2; the pigment is rutile titanium dioxide, preferably Sichuan Longmang R996; the filler is one or a combination of 325-mesh feldspar powder, 800-mesh quartz powder, 325-mesh barium sulfate, and 800-mesh bauxite; the silane coupling agent is at least one of KH550, KH560, KH570, and Dow Corning OSF6040; and the reactive diluent is Cardinalite NC513, Cardinalite NT3000, and Hansen's glycidyl carbonate CARDURA. One or more combinations of E10P are preferred, with Hansen's glycidyl carbonate CARDURA E10P being the preferred reactive diluent. All three reactive diluents can reduce the viscosity of epoxy resin, with Hansen's glycidyl carbonate CARDURA E10P exhibiting the best wettability on the substrate. The leveling agents are BYK320, BYK333, BYK358N, BYK310, and TEGO425. One or more of the following are selected: TEGO 425, BASF leveling agents (3522, 3580, 3650, 3886, 3740), preferably at least one of BYK 320 and BYK 333, which provide the best leveling effect; the first solvent is one or more of xylene, trimethylbenzene, n-butanol, isobutanol, propylene glycol methyl ether, and benzyl alcohol, preferably xylene and benzyl alcohol; the accelerator is one or more of Cardlite NT-1300, Evonik K54, and ethylenediamine oleate, preferably a combination of at least one of Cardlite NT-1300, Evonik K54, and ethylenediamine oleate; the second solvent is one or more of xylene, trimethylbenzene, and n-butanol, preferably a mixture of the three solvents; the defoamer is BYK-066N, BYK-A530, BYK-057, BYK-028, Deqian Defom 6800, or Tego Airex. One or more combinations of 900 and Foamex-8030, preferably at least one of BYK-066N, Deqian Defom 6800, and Tego Airex 900, have the best defoaming effect; the polyamide resin is preferably Cardell NT-154; the bisphenol F epoxy resin is preferably Huntsman low viscosity bisphenol F type epoxy resin ARALDITE GY 282.

[0035] In this embodiment, the bisphenol A type epoxy resin includes epoxy resin E20 and epoxy resin E51. The low-viscosity epoxy resin E51 combined with the high-molecular-weight epoxy resin E20 is beneficial for preparing high-solids-content anti-corrosion coatings and also helps to increase the toughness and durability of the coating. Preferably, the weight ratio of epoxy resin E20 to epoxy resin E51 is 1:4.

[0036] Specifically, the amine curing agent is a modified aliphatic amine curing agent, preferably one or more combinations of air chemically modified aliphatic amines Ancamine 2280, Cardl 5701, and Evonik epoxy curing agent Ancamine 1618. The modified aliphatic amine curing agent, when combined with epoxy resin E51, exhibits excellent chemical resistance, water resistance, and oil resistance.

[0037] Preferably, the weight ratio of bisphenol F epoxy resin to polyamide resin is 1:5, and the weight ratio of polyamide resin to modified aliphatic amine is 1:1-1.5.

[0038] More specifically, petroleum resins include liquid petroleum resins and solid petroleum resins, with a weight ratio of 2:1. Solid petroleum resins differ from liquid petroleum resins in carbon chain saturation. Solid petroleum resins do not contain polar or functional groups in their molecular structure, exhibiting structural stability and good resistance to acids, alkalis, chemicals, and water. Liquid petroleum resins provide better rheological properties and coating adhesion, as well as thickening and wetting effects, increasing wettability of the substrate and improving coating recoatability. Adding appropriate proportions of liquid and solid petroleum resins to anti-corrosion coatings can enhance various properties of the coatings and improve recoatability. For example, the liquid petroleum resin is a C9 / C10 liquid petroleum resin, which is one or more combinations of Novales LA300, LA700, and LA1200, preferably LA700, and the solid petroleum resin is C9 solid petroleum resin SK-120 from Yuan Liang Co., Ltd. (Taiwan).

[0039] This embodiment also provides a method for preparing an epoxy heavy-duty anti-corrosion coating, which includes the following steps:

[0040] S100: Add bisphenol A type epoxy resin and petroleum resin to the first reactor, stir at the first preset stirring speed, add thixotropic agent while maintaining the stirring speed, and stir evenly, then add the preset amount of first solvent.

[0041] S200: Increase the stirring speed to the second preset stirring speed, slowly add pigments and fillers, and clean the inner wall of the first reactor with a preset amount of first solvent;

[0042] S300: Increase the stirring speed to the third preset stirring speed and maintain dispersion for the first preset time at the preset temperature;

[0043] S400: Add silane coupling agent, reactive diluent, leveling agent and a preset amount of first solvent under the fourth preset stirring degree to obtain component A;

[0044] S500: An accelerator is added to an amine composite curing agent prepolymer synthesized from polyamide resin and bisphenol F epoxy resin. The mixture is stirred at a fifth preset speed for a second preset time to control the amine value and viscosity. Modified aliphatic amine and defoamer are added during stirring. After stirring evenly, component B is obtained.

[0045] S600: Anti-corrosion coating is obtained by mixing component A and component B in a ratio of 3-6:1.

[0046] It should be noted that the preparation order of components A and B can be interchanged.

[0047] The first preset mixing speed is 300 rpm - 500 rpm, for example, 300 rpm, 400 rpm, or 500 rpm; the second preset mixing speed is 600 rpm - 800 rpm, for example, 600 rpm, 700 rpm, or 800 rpm; the third preset mixing speed is 1200 rpm - 1500 rpm, for example, 1200 rpm, 1300 rpm, 1400 rpm, or 1500 rpm; the fourth preset mixing speed is 600 rpm - 800 rpm, for example, 600 rpm, 700 rpm, or 800 rpm; and the fifth preset mixing speed is 300 rpm - 500 rpm, for example, 300 rpm, 400 rpm, or 500 rpm.

[0048] The first preset time is 20-30 minutes, and the preset temperature is 55℃-65℃, for example, maintaining dispersion at 55℃, 60℃ or 65℃ for 20 minutes, 25 minutes or 30 minutes; the second preset time is 10 minutes.

[0049] In one embodiment, the bisphenol A type epoxy resin includes epoxy resin E20 and epoxy resin E51. The low-viscosity epoxy resin E51 combined with the high-molecular-weight epoxy resin E20 is beneficial for preparing high-solids-content anti-corrosion coatings and also helps to increase the toughness and durability of the coating. The weight ratio of epoxy resin E20 to epoxy resin E51 is 1:4.

[0050] In one embodiment, the petroleum resin includes liquid petroleum resin and solid petroleum resin, with a weight ratio of liquid to solid petroleum resin of 2:1. The solid petroleum resin differs from the liquid petroleum resin in carbon chain saturation. Solid petroleum resin molecules do not contain polar or functional groups, exhibiting structural stability and good resistance to acids, alkalis, chemicals, and water. Liquid petroleum resin provides better rheological properties and coating adhesion, as well as thickening and wetting effects, increasing wettability to the substrate and improving coating recoatability. Adding an appropriate ratio of liquid and solid petroleum resin to the anti-corrosion coating can enhance its various properties and improve its recoatability. For example, the liquid petroleum resin is a C9 / C10 liquid petroleum resin, preferably one or more combinations of Novales LA300, LA700, and LA1200, with LA700 being preferred. The solid petroleum resin is C9 solid petroleum resin SK-120 from Yuan Liang Co., Ltd. (Taiwan).

[0051] The thixotropic agent is one or a combination of several of the following: polyamide wax powder DISPARLON 6650, CRAYVALLAC ULTRA, amide-modified wax powder THIXATROL ST, CRAYVALLAC MT, bentonite BENTONE SD-2, and Degussa R972. Preferably, the thixotropic agent is a combination of CRAYVALLAC ULTRA and bentonite BENTONE SD-2. Exemplarily, 0.5 parts, 1 part, 1.5 parts, or 2 parts of the thixotropic agent are added.

[0052] The pigment is rutile titanium dioxide, preferably Sichuan Longmang R996. For example, 3, 4, 5, 6, 7, or 8 parts of pigment are added.

[0053] The filler is one or more combinations of 325-mesh feldspar powder, 800-mesh quartz powder, 325-mesh barium sulfate, and 800-mesh bauxite. For example, 20 parts, 30 parts, 40 parts, or 50 parts of filler are added.

[0054] The silane coupling agent is at least one of KH550, KH560, KH570, and Dow Corning OSF6040. For example, 0.5 parts, 1 part, or 1.5 parts of the silane coupling agent are added.

[0055] The reactive diluent is one or more combinations of Cardlite NC513, Cardlite NT3000, and CARDURA E10P glycidyl carbonate, with CARDURA E10P being the preferred reactive diluent. All three reactive diluents can reduce the viscosity of the epoxy resin, and CARDURA E10P exhibits the best wettability to the substrate. For example, 1 part, 2 parts, or 3 parts may be added.

[0056] The leveling agent is one or a combination of several of BYK320, BYK333, BYK358N, BYK310, TEGO425, TEGO425, and BASF leveling agents (3522, 3580, 3650, 3886, 3740), with at least one of BYK320 and BYK333 being preferred for optimal leveling effect. For example, 0.2 parts, 0.3 parts, 0.4 parts, or 0.5 parts of leveling agent may be added.

[0057] The first solvent is one or more combinations of xylene, trimethylbenzene, n-butanol, isobutanol, propylene glycol methyl ether, and benzyl alcohol, preferably xylene and benzyl alcohol. For example, 3 parts, 5 parts, 7 parts, or 10 parts of the first solvent are added.

[0058] The accelerator is one or more combinations of Cardlite NT-1300, Evonik K54, and ethylenediamine oleate, preferably a combination of at least one of Cardlite NT-1300 and Evonik K54 with ethylenediamine oleate. Exemplarily, 2, 3, 4, or 5 parts of the accelerator are added.

[0059] The second solvent is one or more combinations of xylene, trimethylbenzene, and n-butanol, preferably a mixture of the three solvents. For example, 20, 30, 40, or 50 parts of the second solvent are added.

[0060] The defoamer is one or more combinations of BYK-066N, BYK-A530, BYK-057, BYK-028, Defom 6800, TegoAirex 900, and Foamex-8030, with at least one of BYK-066N, Defom 6800, and TegoAirex 900 being preferred for optimal defoaming effect. For example, 1 or 2 parts of defoamer may be added.

[0061] In one embodiment, step S500 includes: adding a preset amount of the second solvent and polyamide resin to a second reactor, stirring at a sixth preset speed until homogeneous, adding bisphenol F resin during stirring, and sealing and placing the mixture for a third preset time after stirring until homogeneous, controlling the amine value and viscosity to obtain an amine composite curing agent prepolymer. By using an amine composite curing agent prepolymer synthesized from polyamide resin and bisphenol F epoxy resin in component B in combination with modified aliphatic amines, the crosslinking density of the epoxy resin is increased, and the film density is improved, thereby effectively increasing the film-forming speed of the anti-corrosion coating, as well as improving the coating's hardness, flexibility, impact resistance, salt spray resistance, seawater resistance, damp heat resistance, cathodic disbondment resistance, and cyclic aging resistance. At the same time, it eliminates the need for functional fillers such as anti-rust pigments and hydrophobic glass flakes, which is beneficial for improving the anti-foaming performance, recoatability, and workability of the anti-corrosion coating.

[0062] During the stirring process, bisphenol F resin is added, stirred evenly, sealed, and left at room temperature for 10-14 hours.

[0063] Among them, the preferred polyamide resin is Cardell NT-1544.

[0064] Among them, Huntsman's low-viscosity bisphenol F epoxy resin ARALDITE GY 282 is preferred.

[0065] Among them, the amine curing agent is a modified aliphatic amine curing agent, preferably one or more combinations of air chemically modified aliphatic amines Ancamine2280, Cardl 5701, and Evonik epoxy curing agent Ancamine 1618. The modified aliphatic amine curing agent, when combined with epoxy resin E51, has excellent chemical resistance, water resistance and oil resistance.

[0066] In one embodiment, the weight ratio of bisphenol F epoxy resin to polyamide resin is 1:5, and the weight ratio of polyamide resin to modified aliphatic amine is 1:1-1.5.

[0067] The sixth preset stirring speed is 300 rpm - 500 rpm, for example, the sixth preset stirring speed is 300 rpm, 400 rpm or 500 rpm, etc.

[0068] The epoxy heavy-duty anti-corrosion coating of this application will be further described below with reference to specific embodiments and comparative examples, but this application is not limited to the following embodiments. Example 1

[0069] Preparation of Component A: First, mix 40 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 5 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120, with a weight ratio of liquid petroleum resin LA700 to solid petroleum resin SK-120 of 2:1. Add this mixture to the first reaction vessel and stir at 400 rpm until the solid petroleum resin is completely dissolved. While maintaining this stirring speed, add 1.5 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Finally, add 3 kg of the first solvent (xylene and benzene). A mixture of methanol was used. The rotation speed was increased to 700 rpm, and 6 kg of R996 titanium dioxide and 40 kg of filler were slowly added. Then, the inner wall of the first reactor was cleaned with 1 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. At a rotation speed of 700 rpm, 1 kg of silane coupling agent OSF6040, 2 kg of reactive diluent glycidyl tert-carbonate E10P, 0.3 kg of leveling agent BYK-320, and 0.2 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0070] Preparation of component B prepolymer: First, add 30 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 30 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 6 kg of bisphenol F epoxy resin GY 282. After stirring evenly, seal the reactor and let it stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0071] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 3 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and while stirring, add 30 kg of modified aliphatic amine 2280 and 1 kg of defoamer BYK066N, stir evenly to obtain Component B.

[0072] Component A and component B are mixed in a 4:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating. Example 2

[0073] Preparation of Component A: First, mix 40 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 5 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120, with a weight ratio of liquid petroleum resin LA700 to solid petroleum resin SK-120 of 2:1. Add this mixture to the first reaction vessel and stir at 400 rpm until the solid petroleum resin is completely dissolved. While maintaining this stirring speed, add 1.7 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Finally, add 2.6 kg of the first solvent (xylene and benzyl alcohol). The mixture was stirred at 700 rpm, and 8 kg of R996 titanium dioxide and 38 kg of filler were slowly added. Then, the inner wall of the first reactor was cleaned with 0.5 kg of the first solvent (a mixture of xylene and benzyl alcohol). The stirring speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. At 700 rpm, 0.8 kg of silane coupling agent OSF6040, 2.6 kg of reactive diluent glycidyl tert-carbonate E10P, 0.4 kg of leveling agent BYK-320 and 0.4 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0074] Preparation of component B prepolymer: First, add 27.5 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 30 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 6 kg of bisphenol F epoxy resin GY 282, stir until uniform, seal well, and let stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0075] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 4 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and while stirring, add 30 kg of modified aliphatic amine 5701 and 1.5 kg of defoamer BYK066N, stir evenly to obtain Component B.

[0076] Component A and component B are mixed in a 4:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating. Example 3

[0077] Preparation of Component A: First, mix 30 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 2 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120, with a weight ratio of liquid petroleum resin LA700 to solid petroleum resin SK-120 of 2:1. Add this mixture to the first reaction vessel and stir at 400 rpm until the solid petroleum resin is completely dissolved. While maintaining this stirring speed, add 0.5 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Finally, add 6 kg of the first solvent (xylene and benzene). The mixture of alcohols was used to increase the rotation speed to 700 rpm. 3 kg of R996 titanium dioxide and 50 kg of filler were slowly added. Then, the inner wall of the first reactor was cleaned with 2 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. Dispersion was continued for 25 minutes. At a rotation speed of 700 rpm, 1.5 kg of silane coupling agent OSF6040, 3 kg of reactive diluent glycidyl tert-carbonate E10P, 0.5 kg of leveling agent BYK-320, and 1.5 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0078] Preparation of component B prepolymer: First, add 20 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 30.5 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 6.1 kg of bisphenol F epoxy resin GY 282, stir until uniform, seal well, and let stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0079] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 2.1 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and add 40 kg of modified aliphatic amine 2280 and 1.3 kg of defoamer BYK066N while stirring, and stir evenly to obtain Component B.

[0080] Component A and component B are mixed in a ratio of 6:1 to obtain an epoxy heavy-duty anti-corrosion coating. Example 4

[0081] Preparation of Component A: First, mix 50 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 5.7 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120, with a weight ratio of liquid petroleum resin LA700 to solid petroleum resin SK-120 of 2:1. Add this mixture to the first reaction vessel and stir at 400 rpm until the solid petroleum resin is completely dissolved. While maintaining this stirring speed, add 2 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Finally, add 2 kg of the first solvent (xylene and benzyl alcohol). The mixture was stirred at 700 rpm, and 3 kg of R996 titanium dioxide and 20 kg of filler were slowly added. Then, the inner wall of the first reactor was cleaned with 0.8 kg of the first solvent (a mixture of xylene and benzyl alcohol). The stirring speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. At 700 rpm, 0.5 kg of silane coupling agent OSF6040, 1 kg of reactive diluent glycidyl tert-carbonate E10P, 0.2 kg of leveling agent BYK-320, and 0.2 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0082] Preparation of component B prepolymer: First, add 50 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 17 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 3.4 kg of bisphenol F epoxy resin GY 282, stir until uniform, seal well, and let stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0083] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 5 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and add 22.6 kg of modified aliphatic amine 2280 and 2 kg of defoamer BYK066N while stirring, and stir evenly to obtain Component B.

[0084] Component A and component B are mixed in a 3:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating. Example 5

[0085] Preparation of Component A: First, mix 35 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 8 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120, with a weight ratio of liquid petroleum resin LA700 to solid petroleum resin SK-120 of 2:1. Add this mixture to the first reaction vessel and stir at 400 rpm until the solid petroleum resin is completely dissolved. While maintaining this stirring speed, add 1 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Add 4.5 kg of the first solvent (a mixture of xylene and benzyl alcohol), increase the stirring speed to 700 rpm, and slowly add 5 kg of... R996 titanium dioxide and 41.8 kg of filler were added, and then the inner wall of the first reaction vessel was washed with 1.5 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. Then, at a rotation speed of 700 rpm, 1 kg of silane coupling agent OSF6040, 1.5 kg of reactive diluent glycidyl tert-carbonate E10P, 0.4 kg of leveling agent BYK-320, and 0.3 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0086] Preparation of component B prepolymer: First, add 29.3 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 25 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 5 kg of bisphenol F epoxy resin GY 282, stir until uniform, seal well, and let stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0087] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 2 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and add 37.5 kg of modified aliphatic amine 1618 and 1.2 kg of defoamer Defom 6800 while stirring, and stir evenly to obtain Component B.

[0088] Component A and component B are mixed in a 5:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0089] Comparative Example 1

[0090] Preparation of Component A: First, mix 40 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Add 5 kg of liquid petroleum resin LA700 to the first reactor and stir at 400 rpm. While maintaining this speed, add 1.5 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Add 3 kg of the first solvent (a mixture of xylene and benzyl alcohol), increase the speed to 700 rpm, and slowly add 6 kg of... R996 titanium dioxide and 40 kg of filler were used. Then, the inner wall of the first reaction vessel was cleaned with 1 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. At a rotation speed of 700 rpm, 1 kg of silane coupling agent OSF6040, 2 kg of reactive diluent glycidyl tert-carbonate E10P, 0.3 kg of leveling agent BYK-320, and 0.2 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0091] Preparation of component B prepolymer: First, add 30 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 30 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 6 kg of bisphenol F epoxy resin GY 282. After stirring evenly, seal the reactor and let it stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0092] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 3 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and while stirring, add 30 kg of modified aliphatic amine 2280 and 1 kg of defoamer BYK066N, stir evenly to obtain Component B.

[0093] Component A and component B are mixed in a 4:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0094] Comparative Example 2

[0095] Preparation of Component A: First, mix 40 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Add 5 kg of solid petroleum resin SK-120 to the first reactor and stir at 400 rpm. While maintaining this speed, add 1.5 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Add 3 kg of the first solvent (a mixture of xylene and benzyl alcohol), increase the speed to 700 rpm, and slowly add 6 kg of... R996 titanium dioxide and 40 kg of filler were used. Then, the inner wall of the first reaction vessel was cleaned with 1 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. At a rotation speed of 700 rpm, 1 kg of silane coupling agent OSF6040, 2 kg of reactive diluent glycidyl tert-carbonate E10P, 0.3 kg of leveling agent BYK-320, and 0.2 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0096] Preparation of component B prepolymer: First, add 30 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 30 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 6 kg of bisphenol F epoxy resin GY 282. After stirring evenly, seal the reactor and let it stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0097] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 3 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and while stirring, add 30 kg of modified aliphatic amine 2280 and 1 kg of defoamer BYK066N, stir evenly to obtain Component B.

[0098] Component A and component B are mixed in a 4:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0099] Comparative Example 3

[0100] Preparation of Component A: First, mix 40 kg of E20 epoxy resin and E51 epoxy resin, wherein the weight ratio of E20 epoxy resin to E51 epoxy resin is 1:4. Then, mix 5... The liquid petroleum resin LA700 and solid petroleum resin SK-120 were mixed and added to the first reactor. The mixture was stirred at 400 rpm. While maintaining the stirring speed, 1.5 kg of thixotropic agent (a mixture of ULTRA and SD-2) was added and stirred until homogeneous. Then, 3 kg of the first solvent (a mixture of xylene and benzyl alcohol) was added, and the stirring speed was increased to 700 rpm. 6 kg of R996 titanium dioxide and 40 kg of filler were slowly added. The inner wall of the first reactor was then cleaned with 1 kg of the first solvent (a mixture of xylene and benzyl alcohol). The stirring speed was increased to 1300 rpm, and the dispersion temperature reached 55°C. The dispersion was continued for 25 minutes. At 700 rpm, 1 kg of silane coupling agent KH560, 2 kg of reactive diluent glycidyl tert-carbonate E10P, 0.3 kg of leveling agent BYK-320, and 0.2 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0101] Preparation of component B prepolymer: First, add 30 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 30 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 6 kg of bisphenol F epoxy resin GY 282. After stirring evenly, seal the reactor and let it stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0102] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 3 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and while stirring, add 30 kg of modified aliphatic amine 2280 and 1 kg of defoamer BYK066N, stir evenly to obtain Component B.

[0103] Component A and component B are mixed in a 4:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0104] Comparative Example 4

[0105] Preparation of Component A: First, mix 40 kg of E20 epoxy resin and E44 epoxy resin, wherein the weight ratio of E20 epoxy resin to E51 epoxy resin is 1:4. Then, add 5... After mixing 1 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120, add them to the first reactor and stir at 400 rpm. While maintaining this speed, add 1.5 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Add 3 kg of the first solvent (a mixture of xylene and benzyl alcohol) and increase the speed to 700 rpm. Slowly add 6 kg of R996 titanium dioxide and 40 kg of filler. Then, wash the inner wall of the first reactor with 1 kg of the first solvent (a mixture of xylene and benzyl alcohol) and increase the speed to 1300 rpm. When the dispersion temperature reaches 55°C, continue dispersing for 25 minutes. At 700 rpm, add 1 kg of silane coupling agent OSF6040, 2 kg of reactive diluent glycidyl tert-carbonate E10P, 0.3 kg of leveling agent BYK-320, and 0.2 kg of the first solvent (a mixture of xylene and benzyl alcohol) to obtain component A.

[0106] Preparation of component B prepolymer: First, add 30 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 30 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 6 kg of bisphenol F epoxy resin GY 282. After stirring evenly, seal the reactor and let it stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0107] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 3 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and while stirring, add 30 kg of modified aliphatic amine 2280 and 1 kg of defoamer BYK066N, stir evenly to obtain Component B.

[0108] Component A and component B are mixed in a 4:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0109] Comparative Example 5

[0110] Preparation of Component A: First, mix 40 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 5 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120 and add them to the first reaction vessel. Stir at 400 rpm, maintaining this speed, and add 1.7 kg of thixotropic agent MT, stirring until homogeneous. Add 2.6 kg of the first solvent (a mixture of xylene and benzyl alcohol), increase the stirring speed to 700 rpm, and slowly add 8 kg of... R996 titanium dioxide and 38 kg of filler were used. Then, the inner wall of the first reaction vessel was cleaned with 0.5 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. At a rotation speed of 700 rpm, 0.8 kg of silane coupling agent OSF6040, 2.6 kg of reactive diluent glycidyl tert-carbonate E10P, 0.4 kg of leveling agent BYK-320, and 0.4 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0111] Preparation of component B prepolymer: First, add 27.5 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 30 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 6 kg of bisphenol F epoxy resin GY 282, stir until uniform, seal well, and let stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0112] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 4 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and while stirring, add 30 kg of modified aliphatic amine 5701 and 1.5 kg of defoamer BYK066N, stir evenly to obtain Component B.

[0113] Component A and component B are mixed in a 4:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0114] Comparative Example 6

[0115] Preparation of Component A: First, mix 30 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of 1:4. Then, mix 2 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120 and add the mixture to the first reactor. Stir at 400 rpm, maintaining this speed. Add 0.5 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Add 6 kg of the first solvent (a mixture of xylene and benzyl alcohol), and increase the stirring speed to 700 rpm. Slowly add 3 kg of R996 titanium dioxide and 50 kg of filler, then wash the inner wall of the first reactor with 2 kg of the first solvent (a mixture of xylene and benzyl alcohol). Increase the rotation speed to 1300 rpm and the dispersion temperature reaches 55℃. Continue dispersing for 25 minutes. Add 1.5 kg of silane coupling agent OSF6040, 3 kg of reactive diluent Cardley NC513, 0.5 kg of leveling agent BYK-320 and 1.5 kg of the first solvent (a mixture of xylene and benzyl alcohol) at a rotation speed of 700 rpm to obtain component A.

[0116] Preparation of component B prepolymer: First, add 20 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 30.5 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 6.1 kg of bisphenol F epoxy resin GY 282, stir until uniform, seal well, and let stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0117] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 2.1 kg of accelerator (a mixture of K54 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and add 40 kg of modified aliphatic amine 2280 and 1.3 kg of defoamer BYK066N while stirring, and stir evenly to obtain Component B.

[0118] Component A and component B are mixed in a ratio of 6:1 to obtain an epoxy heavy-duty anti-corrosion coating.

[0119] Comparative Example 7

[0120] Preparation of Component A: First, mix 50 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 5.7 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120 and add them to the first reaction vessel. Stir at 400 rpm, maintaining this speed, and add 2 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Next, add 2 kg of the first solvent (a mixture of xylene and benzyl alcohol), increasing the stirring speed to 700 rpm and slowly adding... 3 kg of R996 titanium dioxide and 20 kg of filler were added, and then the inner wall of the first reaction vessel was cleaned with 0.8 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. At a rotation speed of 700 rpm, 0.5 kg of silane coupling agent OSF6040, 1 kg of reactive diluent glycidyl tert-carbonate E10P, 0.2 kg of leveling agent BYK-320, and 0.2 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0121] Preparation of component B prepolymer: First, add 50 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 17 kg of polyamide curing agent 305-70X to the second reactor and stir at 400 rpm until uniform. While stirring, add 3.4 kg of bisphenol F epoxy resin GY 282. After stirring evenly, seal the reactor and let it stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0122] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 5 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and add 22.6 kg of modified aliphatic amine 2280 and 2 kg of defoamer BYK066N while stirring, and stir evenly to obtain Component B.

[0123] Component A and component B are mixed in a 3:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0124] Comparative Example 8

[0125] Preparation of Component A: First, mix 50 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 5.7 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120 and add them to the first reaction vessel. Stir at 400 rpm, maintaining this speed, and add 2 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Next, add 2 kg of the first solvent (a mixture of xylene and benzyl alcohol), increasing the stirring speed to 700 rpm and slowly adding... 3 kg of R996 titanium dioxide and 20 kg of filler were added, and then the inner wall of the first reaction vessel was cleaned with 0.8 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. At a rotation speed of 700 rpm, 0.5 kg of silane coupling agent OSF6040, 1 kg of reactive diluent glycidyl tert-carbonate E10P, 0.2 kg of leveling agent BYK-320, and 0.2 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0126] Preparation of component B prepolymer: First, add 50 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 17 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 3.4 kg of bisphenol F epoxy resin GY 285. After stirring evenly, seal the reactor and let it stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0127] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 5 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and add 22.6 kg of modified aliphatic amine 2280 and 2 kg of defoamer BYK066N while stirring, and stir evenly to obtain Component B.

[0128] Component A and component B are mixed in a 3:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0129] Comparative Example 9

[0130] Preparation of Component A: First, mix 35 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 8 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120 and add them to the first reaction vessel. Stir at 400 rpm, maintaining this speed, and add 1 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Add 4.5 kg of the first solvent (a mixture of xylene and benzyl alcohol), increase the stirring speed to 700 rpm, and slowly add 5 kg of... R996 titanium dioxide and 41.8 kg of filler were added, and then the inner wall of the first reaction vessel was cleaned with 0.8 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. At a rotation speed of 700 rpm, 1.5 kg of silane coupling agent OSF6040, 1.5 kg of reactive diluent glycidyl tert-carbonate E10P, 0.4 kg of leveling agent BYK-320, and 0.3 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0131] Preparation of component B prepolymer: First, add 29.3 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 25 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 5 kg of bisphenol F epoxy resin GY 282, stir until uniform, seal well, and let stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0132] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 2 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and while stirring, add 37.5 kg of modified aliphatic amine 1618 and 1.2 kg of defoamer BYKA530, stir evenly to obtain Component B.

[0133] Component A and component B are mixed in a 5:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0134] Comparative Example 10

[0135] Preparation of Component A: First, mix 40 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 5 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120 and add them to the first reaction vessel. Stir at 400 rpm, maintaining this speed, and add 1.5 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Add 3 kg of the first solvent (a mixture of xylene and benzyl alcohol), increase the speed to 700 rpm, and slowly add 6 kg of R... 996 titanium dioxide, 30 kg of filler, and 10 kg of zinc phosphate anti-rust pigment were mixed. Then, the inner wall of the first reaction vessel was cleaned with 1 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. At a rotation speed of 700 rpm, 1 kg of silane coupling agent OSF6040, 2 kg of reactive diluent glycidyl tert-carbonate E10P, 0.3 kg of leveling agent BYK-320, and 0.2 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0136] Preparation of component B prepolymer: First, add 30 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 30 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 6 kg of bisphenol F epoxy resin GY 282. After stirring evenly, seal the reactor and let it stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0137] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 3 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and while stirring, add 30 kg of modified aliphatic amine 2280 and 1 kg of defoamer BYK066N, stir evenly to obtain Component B.

[0138] Component A and component B are mixed in a 4:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0139] Comparative Example 11

[0140] Preparation of Component A: First, mix 40 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 5 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120 and add them to the first reaction vessel. Stir at 400 rpm, maintaining this speed, and add 1.5 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Add 3 kg of the first solvent (a mixture of xylene and benzyl alcohol), increase the speed to 700 rpm, and slowly add 6 kg of... The following ingredients were used: gR996 titanium dioxide, 30 kg of filler, and 10 kg of glass flakes. The inner wall of the first reaction vessel was then cleaned with 1 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55°C. The dispersion was continued for 25 minutes. At a rotation speed of 700 rpm, 1 kg of silane coupling agent OSF6040, 2 kg of reactive diluent glycidyl tert-carbonate E10P, 0.3 kg of leveling agent BYK-320, and 0.2 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0141] Preparation of component B prepolymer: First, add 30 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 30 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 6 kg of bisphenol F epoxy resin GY 282. After stirring evenly, seal the reactor and let it stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0142] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 3 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and while stirring, add 30 kg of modified aliphatic amine 2280 and 1 kg of defoamer BYK066N, stir evenly to obtain Component B.

[0143] Component A and component B are mixed in a 4:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0144] Comparative Example 12

[0145] Preparation of Component A: First, mix 35 kg of E20 epoxy resin and E51 epoxy resin, with a weight ratio of E20 epoxy resin to E51 epoxy resin of 1:4. Then, mix 8 kg of liquid petroleum resin LA700 and solid petroleum resin SK-120 and add them to the first reaction vessel. Stir at 400 rpm, maintaining this speed, and add 1 kg of thixotropic agent (a mixture of ULTRA and SD-2) and stir until homogeneous. Add 4.5 kg of the first solvent (a mixture of xylene and benzyl alcohol), increase the stirring speed to 700 rpm, and slowly add 5 kg of... R996 titanium dioxide and 41.8 kg of filler were added, and then the inner wall of the first reaction vessel was cleaned with 1.5 kg of the first solvent (a mixture of xylene and benzyl alcohol). The rotation speed was increased to 1300 rpm, and the dispersion temperature reached 55℃. The dispersion was continued for 25 minutes. At a rotation speed of 700 rpm, 1 kg of silane coupling agent OSF6040, 1.5 kg of reactive diluent glycidyl tert-carbonate E10P, 0.4 kg of leveling agent BYK-320, and 0.3 kg of the first solvent (a mixture of xylene and benzyl alcohol) were added to obtain component A.

[0146] Preparation of component B prepolymer: First, add 29.3 kg of the second solvent (a mixture of xylene, trimethylbenzene and n-butanol) and 25 kg of polyamide curing agent NT-1544 to the second reactor and stir at 400 rpm until uniform. While stirring, add 5 kg of bisphenol F epoxy resin GY 282, stir until uniform, seal well, and let stand at room temperature overnight. Control the amine value and viscosity to obtain the amine composite curing agent prepolymer.

[0147] Preparation of Component B: If the amine value of the amine composite curing agent prepolymer is qualified, add 2 kg of accelerator (a mixture of NT1300 and ethylenediamine oleate), stir at 400 rpm for 10 min, control the amine value and viscosity, and while stirring, add 37.5 kg of Handai modified aliphatic amine 1619 and 1.2 kg of defoamer Defom 6800, stir evenly to obtain Component B.

[0148] Component A and component B are mixed in a 5:1 ratio to obtain an epoxy heavy-duty anti-corrosion coating.

[0149] The epoxy heavy-duty anti-corrosion coatings obtained in each embodiment and comparative example were subjected to tests of workability, maximum recoating time, cyclic aging resistance (4200h), cathodic disbondment resistance (4200h), seawater immersion resistance (4200h), salt spray resistance (3000h), and adhesion. The testing standards referred to GB / T 31817-2015 Technical Specification for Protective Coating of Wind Power Generation Facilities, Norsok standard M-501, and ISO 20340. The test results are shown in Table 1.

[0150] Table 1. Test results of epoxy heavy-duty anti-corrosion coatings prepared in various examples and comparative examples.

[0151] As shown in Table 1 above, the epoxy heavy-duty anti-corrosion coatings prepared in Examples 1-5 all exhibit good performance. Roller coating, brush coating, and spray coating are all feasible. The longest recoating time is 90 days. In a cyclic aging test of 4200h, corrosion spread is less than 8mm. In a cathodic disbondment test of 4200h, the disbondment diameter does not exceed 20mm. In a seawater immersion test of 4200h, the paint film remains intact, and corrosion spread at the marked areas is less than 8mm. In a salt spray test of 3000h, the paint film remains intact, and corrosion spread at the marked areas is less than 2mm. The adhesion is significantly higher than the performance requirement of 5MPa.

[0152] Comparative Example 1 used liquid petroleum resin LA700 alone, while Example 1 used a mixture of liquid petroleum resin LA700 and solid petroleum resin SK-120. The other raw materials were the same. The epoxy heavy-duty anti-corrosion coating of Comparative Example 1 resisted corrosion spread at the cathodic disbondment scribe line by more than 20 mm.

[0153] Comparative Example 2 used solid petroleum resin SK-120 alone, while Example 1 used a mixture of liquid petroleum resin LA700 and solid petroleum resin SK-120. The other raw materials were the same. The epoxy heavy-duty anti-corrosion coating of Comparative Example 2 had poor resistance to wetting and leveling during construction.

[0154] In Comparative Example 3, KH560 was used as the silane coupling agent, while in Example 1, OSF6040 was used. All other raw materials were the same. In Comparative Example 3, the epoxy heavy-duty anti-corrosion coating showed blistering on the surface of both the artificial seawater and salt spray resistant plates.

[0155] Comparative Example 4 used E44 epoxy resin, while Example 1 used E51 epoxy resin. The other raw materials were the same. The epoxy heavy-duty anti-corrosion coating of Comparative Example 4 had a severe orange peel appearance after spraying.

[0156] Comparative Example 5 used MT wax powder as a thixotropic agent, while Example 2 used ULTRA wax powder and SD-2 bentonite in combination. All other raw materials were the same. The epoxy heavy-duty anti-corrosion coating of Comparative Example 5 showed sagging during roller and brush application.

[0157] Comparative Example 6 used the reactive diluent Cardell NC513, while Example 3 used the reactive diluent glycidyl tert-carbonate E10P. The other raw materials were the same. The epoxy heavy-duty anti-corrosion coating of Comparative Example 6 had poor leveling effect when applied by roller coating, brush coating and spray coating.

[0158] Comparative Example 7 used polyamide curing agent 305-70X, while Example 4 used polyamide curing agent NT-1544. All other raw materials were the same. The epoxy heavy-duty anti-corrosion coating of Comparative Example 7 exceeded the performance requirements in terms of seawater resistance and corrosion propagation resistance at the salt spray markings.

[0159] Comparative Example 8 used bisphenol F resin GY 285, while Example 4 used bisphenol F resin GY 282. All other raw materials were the same. The epoxy heavy-duty anti-corrosion coating of Comparative Example 8 exceeded the performance requirements in terms of resistance to cyclic aging, artificial seawater, and corrosion propagation at salt spray markings.

[0160] Comparative Example 9 used defoamer BYKA530, while Example 5 used Defom 6800. The other raw materials were the same. Comparative Example 9 had more bubbles when applying the epoxy heavy-duty anti-corrosion coating by roller or brush.

[0161] Comparative Example 10 used zinc phosphate as an anti-rust pigment, while Example 1 did not use an anti-rust pigment. All other raw materials were the same. The epoxy heavy-duty anti-corrosion coating of Comparative Example 10 showed blistering on both artificial seawater and salt spray resistant surfaces.

[0162] Comparative Example 11 used glass flakes, while Example 1 did not use glass flakes. The other raw materials were the same. The epoxy heavy-duty anti-corrosion coating of Comparative Example 11 could not be applied by spraying and the longest recoating time was only 10 hours.

[0163] Comparative Example 12 used Handai modified aliphatic 1619, while Example 5 used modified aliphatic amine 1618. The epoxy heavy-duty anti-corrosion coating of Comparative Example 12 exceeded the performance requirements in both cyclic aging and cathodic disbondment resistance tests.

[0164] The epoxy heavy-duty anti-corrosion coating preparation method provided in this embodiment uses low-viscosity E51 epoxy resin combined with high-molecular-weight epoxy resin E20, which is beneficial for preparing high-solids coatings and helps increase the toughness and durability of the coating. The addition of liquid and solid petroleum resins improves the wettability of the coating to the substrate, as well as the hardness and adhesion of the coating. Simultaneously, component B is prepared by a "hot blending" of polyamide and bisphenol F epoxy resin followed by a "cold blending" with modified fatty amines, which accelerates the drying speed of the coating, improves the wettability and recoatability of the coating to the substrate, and significantly enhances the coating's weather resistance, cathodic disbondment resistance, and salt spray resistance. The resulting epoxy heavy-duty anti-corrosion coating not only possesses excellent adhesion, resistance to cyclic aging, cathodic disbondment resistance, salt spray resistance, and seawater immersion resistance, but also has a wide application window, allowing for easy application via roller coating, brushing, and spraying. Furthermore, the production process is simple, making it widely applicable to steel structures in marine splash zones.

[0165] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An epoxy heavy-duty anti-corrosion coating for marine splash zones, characterized in that, It includes component A and component B in a weight ratio of 3-6:1; By weight, component A comprises 30-50 parts of bisphenol A type epoxy resin, 2-8 parts of petroleum resin, 0.5-2 parts of thixotropic agent, 3-8 parts of pigment, 20-50 parts of filler, 0.5-1.5 parts of silane coupling agent, 1-3 parts of reactive diluent, 3-10 parts of first solvent, and 0.2-0.5 parts of leveling agent; the petroleum resin comprises liquid petroleum resin and solid petroleum resin, wherein the weight ratio of liquid petroleum resin to solid petroleum resin is 2:

1. By weight, component B comprises 20-40 parts of an amine composite curing agent prepolymer synthesized from polyamide resin and bisphenol F epoxy resin, 20-40 parts of an amine curing agent, 20-50 parts of a second solvent, 2-5 parts of an accelerator, and 1-2 parts of an defoamer. The bisphenol A type epoxy resin includes epoxy resin E20 and epoxy resin E51; The weight ratio of the bisphenol F epoxy resin to the polyamide resin is 1:5; The petroleum resin includes liquid petroleum resin LA700 and solid petroleum resin SK-120; The bisphenol F epoxy resin and the polyamide resin are GY282 and NT-1544, respectively; The thixotropic agent is a mixture of ULTRA and SD-2; The silane coupling agent is silane coupling agent OSF6040; The active diluent is glycidyl tert-carbonate E10P; The defoamer is Defom 6800 or BYK066N; The amine curing agent includes a modified aliphatic amine, and the weight ratio of the polyamide resin to the modified aliphatic amine is 1:1-1.5; The modified aliphatic amine includes one or more of the following: modified aliphatic amine Ancamine 2280, Cardl 5701, and Evonik epoxy curing agent Ancamine 1618.

2. A method for preparing an epoxy heavy-duty anti-corrosion coating, used to prepare the epoxy heavy-duty anti-corrosion coating for marine splash zones as described in claim 1, characterized in that, Includes the following steps: Bisphenol A type epoxy resin and petroleum resin are added to the first reaction vessel. The mixture is stirred at a first preset stirring speed. Thixotropic agent is added while maintaining the stirring speed, and the mixture is stirred evenly. A preset amount of first solvent is then added. Increase the stirring speed to the second preset stirring speed, slowly add pigments and fillers, and clean the inner wall of the first reaction vessel with a preset amount of the first solvent; Increase the stirring speed to the third preset stirring speed, and maintain dispersion for the first preset time at the preset temperature; Add silane coupling agent, reactive diluent, leveling agent and a preset amount of the first solvent at a fourth preset stirring degree to obtain component A; An accelerator is added to an amine composite curing agent prepolymer synthesized from polyamide resin and bisphenol F epoxy resin. The mixture is stirred at a fifth preset speed for a second preset time to control the amine value and viscosity. Modified aliphatic amine and defoamer are added during stirring. After stirring evenly, component B is obtained. The anti-corrosion coating is obtained by mixing component A and component B in a ratio of 3-6:

1. The first preset stirring speed is 300 rpm - 500 rpm, the second preset stirring speed is 600 rpm - 800 rpm, the third preset stirring speed is 1200 rpm - 1500 rpm, the fourth preset stirring speed is 600 rpm - 800 rpm, the first preset time is 20 min - 30 min, the preset temperature is 55℃ - 65℃, the fifth preset stirring speed is 300 rpm - 500 rpm, and the sixth preset stirring speed is 300 rpm - 500 rpm.

3. The method for preparing epoxy heavy-duty anti-corrosion coating according to claim 2, characterized in that, The second solvent and polyamide resin of a preset amount are added to the second reactor and stirred evenly at the sixth preset speed. Bisphenol F resin is added while stirring. After stirring evenly, the reactor is sealed and placed for the third preset time. The amine value and viscosity are controlled to obtain the amine composite curing agent prepolymer.

4. The method for preparing epoxy heavy-duty anti-corrosion coating according to claim 2, characterized in that, When adding bisphenol A type epoxy resin and petroleum resin, epoxy resin E20 and epoxy resin E51 are added to the first reactor in a weight ratio of 1:4, and liquid petroleum resin and solid petroleum resin are added to the first reactor in a weight ratio of 2:

1. Then, the mixture is stirred at the first preset stirring speed until the solid petroleum resin is completely dissolved.