Preparation method of high-performance concrete anticorrosive coating and coating

Abstract

The application provides a preparation method of a high-performance concrete anticorrosive coating, and relates to the fields of building materials and corrosion protection technology.The coating is composed of component A and component B.Component A comprises epoxy resin, composite solvent, organic solvent, dispersant, fumed silica and leveling agent.Component B comprises epoxy curing agent, conductive polymer dispersion and organic solvent.The composite solvent is composed of one or more of n-titanate, phosphate ester and n-silicate, and is compounded with ester, ketone, alcohol, aromatic hydrocarbon, aliphatic hydrocarbon or ether organic solvent.The preparation method of the anticorrosive coating comprises the following steps: preparing component A and component B, mixing the two components to form the coating, applying the coating to the surface of concrete and curing.The coating has a compact structure and strong adhesion, can significantly improve the durability and anticorrosive performance of concrete in extreme environments such as high-salt and high-acid environments, and is particularly suitable for the protection of infrastructure in coastal and heavy-corrosion industrial areas.

Description

Technical Field

[0001] This invention belongs to the field of building materials and corrosion protection technology, specifically relating to a high-performance concrete anti-corrosion coating and a method for preparing the coating. Background Technology

[0002] Concrete is one of the most widely used building materials, and its high strength, ease of construction, and low cost make it widely used in industry, transportation, energy, and municipal engineering. However, due to its internal pores and capillary channels, concrete is highly susceptible to corrosion from moisture, chlorides, acids, alkalis, and other corrosive media during long-term service, leading to performance degradation, structural damage, and even failure. Extensive research and engineering practice have shown that concrete corrosion not only causes steel reinforcement corrosion and structural cracking but also severely shortens the service life of structures. In harsh environments such as bridges, tunnels, dams, factories, ports, and salt chemical plants, it often results in significant economic losses and safety hazards.

[0003] To delay concrete corrosion, common protective measures mainly fall into two categories: treatment with penetrating siloxane materials and organic coatings. The former relies on siloxane molecules penetrating into the pores of concrete, where their alkoxy groups hydrolyze under alkaline conditions and combine with the matrix to form a hydrophobic barrier, thereby reducing porosity and water absorption. However, this method cannot completely seal capillary channels, and its barrier effect against corrosive media is limited. In high-salinity or strong acid environments, the protective effect significantly diminishes, making it unsuitable for use under extreme conditions such as salt chemical processing and wastewater treatment.

[0004] Organic coatings extend the structural lifespan by forming a protective film on the concrete surface, preventing the intrusion of external media. Commonly used systems include epoxy resins, polyurethanes, and acrylic resins, which exhibit good durability in neutral environments. However, these coatings have stringent requirements for application conditions, particularly the moisture content of the substrate. Current construction specifications generally stipulate that the concrete moisture content should be below 6.0%, otherwise, it can easily lead to decreased coating adhesion, blistering, cracking, and other problems, thus reducing protective performance. Since concrete is often in a damp state in actual engineering projects, this limitation significantly reduces construction efficiency and applicability.

[0005] Furthermore, single organic coatings suffer from insufficient weather resistance and rapid degradation of barrier properties during long-term service. Especially under special conditions with high salinity (high saturation) and significantly lower acidity (significantly lower than neutral), such as brine production tanks in salt chemical plants, some wastewater treatment facilities, and chemical production sites, the corrosion rate is far higher than in ordinary marine environments, and conventional coatings often fail within a short period. As concrete structures gradually develop towards larger scale, longer lifespan, and harsher service environments, existing protective technologies are insufficient to guarantee their service life, becoming a key bottleneck restricting the durability of engineering projects.

[0006] Therefore, there is an urgent need to develop a high-performance, environmentally friendly, and construction-adaptable concrete anti-corrosion coating that can maintain good film-forming properties even when the concrete has a high moisture content, and provide long-term effective protection under harsh conditions such as high salt and high acid, so as to meet the higher requirements for durability and safety of future infrastructure and industrial structures. Summary of the Invention

[0007] This invention addresses the problems of limited anti-corrosion effect, strict requirements on concrete moisture content, and easy failure in high-salt and high-acid environments in existing concrete protection technologies. It provides a high-performance concrete anti-corrosion coating and preparation method to achieve strong coating application adaptability, long-lasting protective effect, and effective extension of the service life of concrete structures in harsh environments.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] The first aspect of this invention provides a high-performance concrete anti-corrosion coating, comprising component A and component B. By mass, component A comprises: 100 parts epoxy resin, 15-30 parts composite solvent, 30-50 parts organic solvent, 1-3 parts dispersant, 1-3 parts fumed silica, and 0.5-2 parts leveling agent; component B comprises: 15-25 parts epoxy curing agent, 8-14 parts conductive polymer dispersion, and 6-12 parts organic solvent; wherein the composite solvent is prepared by combining one or more of orthotitanate, phosphate, and orthosilicate with one or more of ester, ketone, alcohol, aromatic hydrocarbon, aliphatic hydrocarbon, and ether organic solvents.

[0010] Preferably, the high-performance concrete anti-corrosion coating comprises component A and component B. By mass, component A comprises: 100 parts epoxy resin, 20-25 parts composite solvent, 35-45 parts organic solvent, 1.5-2.5 parts dispersant, 1.5-2.5 parts fumed silica, and 0.8-1.5 parts leveling agent; component B comprises: 18-22 parts epoxy curing agent, 10-13 parts conductive polymer dispersion, and 8-11 parts organic solvent; wherein the composite solvent is prepared by one or more of orthotitanate, phosphate, and orthosilicate and one or more of ester, ketone, alcohol, aromatic hydrocarbon, aliphatic hydrocarbon, and ether organic solvent.

[0011] Furthermore, the mass percentage of one or more of the orthotitanate, phosphate, and orthosilicate in the composite solvent is 5.0% to 100.0%, preferably 30% to 80%, and more preferably 60% to 70%.

[0012] Furthermore, the composite solvent is prepared by combining titanate, phosphate ester and orthosilicate with one or more organic solvents selected from esters, ketones, alcohols, aromatic hydrocarbons, aliphatic hydrocarbons and ethers.

[0013] Further, the mass ratio of the orthotitanate, phosphate ester and orthosilicate is 1:(0.8-1.2):(0.8-1.2).

[0014] Further, the orthotitanate is one or more of tetraethyl orthotitanate, butyl orthotitanate, and isopropyl orthotitanate; the phosphate ester is one or more of triethyl orthophosphate, tributyl orthophosphate, and trimethyl orthophosphate; and the orthosilicate is one or more of tetraethyl orthosilicate, methyl orthosilicate, and butyl orthosilicate.

[0015] In this invention, titanate, phosphate, and orthosilicate are key functional additives in the coating formulation. Titanate possesses excellent surface activity and inorganic phase affinity, effectively improving the interfacial bonding between inorganic fillers and organic resins in the coating, thus enhancing the dispersion stability and film density of the system. Simultaneously, some titanate can react with hydroxyl groups on the substrate surface, enhancing the coating's adhesion to concrete. Phosphate exhibits excellent heat resistance, hydrolysis resistance, and flame retardancy, while also possessing a certain surface tension regulating ability, improving the flexibility and resistance to damp heat aging in the coating. Orthosilicate can form a dense three-dimensional cross-linked structure during curing, thereby improving the coating's hydrophobicity, impermeability, and weather resistance, especially significantly delaying aging and failure in environments with chloride ion penetration, high humidity, and UV exposure.

[0016] In the preferred embodiment of the present invention, the above three types of ester compounds are used in combination to achieve organic-inorganic interface synergy and functional superposition at the molecular level: titanate provides structural adhesion and dispersion support, phosphate provides flexibility and corrosion resistance protection, and silicate provides a dense network and waterproof barrier, so that the coating has multiple performance indicators such as high adhesion, high density, corrosion resistance, and impermeability, which are significantly better than single functional component systems, and endow the concrete coating with the ability to serve stably for a long time under extreme working conditions such as high salt, high acid, and high humidity.

[0017] Furthermore, the organic solvents in components A and B are one or more of alcohols, esters, and ketones; for example, methanol, ethanol, propanol, n-butanol, ethyl acetate, butyl acetate, acetone, butanone, cyclohexanone, etc.

[0018] Furthermore, the dispersant is one or more of the following: polycarboxylic acid dispersants, polyamide dispersants, block copolymer dispersants, sulfosuccinate dispersants, or organophosphonate dispersants; for example: 25736-86-1 polyethylene glycol methyl polyacrylate dispersant from Wuhan Jushun Chemical Co., Ltd., E-3910 polyamide dispersant from Shandong Huling New Materials Co., Ltd., and BYK163 block copolymer dispersant from BAK (Germany).

[0019] Furthermore, the leveling agent is one or more of acrylate-based, polyether-modified silicone oil-based, or fluorine-modified polymer-based leveling agents; for example: RF-7106 acrylate-based leveling agent from Qingdao Shengshi New Materials Co., Ltd., WE3221 polyether-modified silicone leveling agent from BASF, and SI-2041 fluorine-modified acrylate leveling agent from Laiyang Shengbang Silicone Technology Co., Ltd.

[0020] Furthermore, the epoxy curing agent is one or more of the following: amines, low molecular weight polyamides, phenolic amines, and imidazoles; for example: small molecule organic amines such as ethylenediamine, diethylenetriamine, triethylenetetramine, and pentanediamine; low molecular weight polyamides such as P203, 650, and 651; phenolic amines such as T31, T33, and 1041 or cashew phenol-modified phenolic amines; and alkyl imidazole curing agents such as ethyl imidazole.

[0021] Furthermore, the conductive polymer dispersion is an anhydrous polyaniline dispersion with a mass fraction of 10-30%.

[0022] A second aspect of this invention provides a method for preparing a high-performance concrete anti-corrosion coating, comprising the following steps:

[0023] (1) Mix the epoxy resin, composite solvent and organic solvent in component A, stir and then add the dispersant, fumed silica and leveling agent in sequence, and continue stirring to obtain component A;

[0024] Component B is obtained by mixing the epoxy curing agent, conductive polymer dispersion and organic solvent in component B;

[0025] Mix component A and component B and let stand for 15-30 minutes to obtain the anti-corrosion coating.

[0026] (2) Clean the surface of the concrete substrate and apply the anti-corrosion coating from step (1) to the surface of the concrete substrate. The coating thickness is controlled between 200 and 600 μm.

[0027] (3) The coating is cured to obtain a high-performance concrete anti-corrosion coating.

[0028] Furthermore, the curing temperature in step (3) is 20-30°C, and the curing time is 48-168 hours.

[0029] The coating of this invention introduces hydrolyzable titanate, phosphate, and silicate components into component A. Utilizing the weak alkalinity of the concrete substrate surface and the residual moisture in its pores, these components undergo in-situ hydrolysis and condensation reactions during or initially after coating application, generating insoluble inorganic deposits such as TiO2, P2O5, and / or SiO2. These deposits are then embedded in the concrete pores at the interface. This process forms a dense, firmly adhered "interfacial dense layer" with chemical bonding to the substrate, significantly blocking the penetration channels of corrosive media such as water, acids, and salts, and improving the chemical stability and sealing properties of the coating-concrete interface.

[0030] Meanwhile, the external epoxy resin system cross-links into a film under the action of the curing agent, constructing a dense organic coating with good mechanical strength, wear resistance, and chemical barrier properties. Thus, the coating structure presents a dual structure of "inner inorganic interface deposition + outer organic cross-linked coating": the former, like an inner lining, is embedded in the micropores of the concrete, enhancing the density and adhesion of the substrate; the latter, like an outer armor, provides a physical barrier and impermeability. The two work synergistically to achieve multi-dimensional protection for the concrete structure.

[0031] Compared with traditional coating systems, this dual-function composite protective layer not only significantly improves corrosion resistance but also has a longer service life and stronger interface stability. It is particularly suitable for concrete infrastructure in complex service environments such as high salt, high acid, high humidity, and high temperature, such as coastal structures, chemical plant floors, pools, and canals, which are key protection scenarios.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. Strong adhesion and interface stability: By introducing hydrolyzable titanate, phosphate and silicate, inorganic deposits such as TiO2, P2O5 and / or SiO2 are generated in situ on the concrete surface, forming a "dense interface layer", which significantly enhances the chemical bonding between the coating and the substrate. The adhesion is much higher than that of traditional coatings and the interface stability is better.

[0034] 2. Excellent durability and barrier properties: The coating remains intact after long-term immersion in media such as salt water, acid, alkali and deionized water, showing good water resistance, salt resistance and chemical corrosion resistance. The resistance to chloride ion penetration and electrochemical impedance are significantly improved, effectively blocking the intrusion of corrosive media.

[0035] 3. Suitable for high humidity and high moisture content substrates: The coating is highly adaptable to the moisture content of concrete and can form a film normally on the surface of damp substrates or substrates with a moisture content higher than 6%, solving the problem of traditional epoxy coatings being highly dependent on drying conditions, and significantly improving construction efficiency and application scope.

[0036] 4. Synergistic protection of organic-inorganic composite structure: The inner inorganic deposition layer seals the micropores of concrete, while the outer epoxy cross-linked film provides mechanical and chemical barriers, forming a dual protection system of "embedded + outer protection", which significantly improves the long-term stability of the coating in extreme environments.

[0037] 5. Suitable for extreme corrosive environments: Under harsh conditions such as high salt and high acid, the coating remains intact after long-term use, far exceeding the protection life of traditional coatings. It is especially suitable for infrastructure protection in heavily corrosive areas such as coastal areas, salt chemical plants, and sewage treatment plants.

[0038] 6. Easy to apply and environmentally friendly: The coating is a two-component system that can be used immediately after mixing. It cures at room temperature without the need for heating or special equipment. The solvent used is a conventional environmentally friendly organic solvent, which meets the requirements of green construction. Attached Figure Description

[0039] Figure 1 The images show a corrosion comparison of the anti-corrosion coating prepared in Example 1 of this invention after one year in the extreme environment of a brine production tank. In the figures, a: the concrete surface with the coating applied; b: the bare concrete surface without the coating. Detailed Implementation

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In addition, it is worth noting that the raw materials involved in the present invention are all commercially available products unless otherwise specified.

[0041] Example 1

[0042] This embodiment provides a high-performance concrete anti-corrosion coating, including the following steps:

[0043] (1) Preparation of composite solvent

[0044] Take 66.67 g of tetraethyl titanate, 66.67 g of triethyl phosphate and 66.66 g of tetraethyl orthosilicate and mix them evenly. Then add 50.0 g of ethyl acetate and 50.0 g of butyl acetate and stir evenly to obtain a composite solvent.

[0045] (2) Preparation of component A

[0046] Add 22.5 g of the above composite solvent and 37.96 g of mixed organic solvent (a mixture of ethyl acetate and butyl acetate) to 100 g of E44 epoxy resin. After stirring evenly, add 2.0 g of dispersant (BYK163 block copolymer dispersant), 2.0 g of fumed silica and 1.0 g of leveling agent (WE3221 polyether modified organosilicon). Continue stirring evenly and then grind and disperse to obtain component A.

[0047] (3) Preparation of component B

[0048] Add 13.0 g of anhydrous polyaniline dispersion with a mass fraction of 20% to 30 g of T31 epoxy curing agent with an amine value of approximately 435, then add 12.15 g of mixed solvent (a mixture of ethanol and n-butanol), and stir until homogeneous to obtain component B.

[0049] (4) Coating mixing and application

[0050] Take 60 g of component A and 20 g of component B, mix them evenly, and let stand for 15 minutes to obtain the anti-corrosion coating for construction.

[0051] Clean the surface of the C80 concrete substrate to be treated, ensuring it is free of dust, oil, and visible water stains. Apply the coating evenly to the concrete surface in three coats using a brushing method, with the total coating thickness controlled at 300±40 μm.

[0052] (5) Coating curing

[0053] The coated sample was placed in a room temperature (approximately 25°C) environment for 168 hours to cure, resulting in a dense, uniform, high-performance concrete anti-corrosion coating.

[0054] Example 2

[0055] This embodiment provides a high-performance concrete anti-corrosion coating, including the following steps:

[0056] (1) Preparation of composite solvent

[0057] Take 200.0 g of tetraethyl titanate, add 50.0 g of ethyl acetate and 50.0 g of butyl acetate in sequence, stir until uniform, and obtain a composite solvent.

[0058] (2) Preparation of component A

[0059] Add 22.5 g of the above composite solvent and 37.33 g of mixed organic solvent (a mixture of ethyl acetate and butyl acetate) to 100 g of E44 epoxy resin. After stirring evenly, add 2.0 g of dispersant (BYK163 block copolymer dispersant), 2.0 g of fumed silica and 1.0 g of leveling agent (SI-2041 fluorinated acrylate leveling agent) in sequence. Continue stirring evenly and grinding to disperse to obtain component A.

[0060] (3) Preparation of component B

[0061] Add 13.0 g of anhydrous polyaniline dispersion with a mass fraction of 20% to 30 g of T31 epoxy curing agent with an amine value of approximately 435, and then add 11.94 g of mixed solvent (a mixture of ethanol and n-butanol), and stir until homogeneous to obtain component B.

[0062] (4) Coating mixing and application

[0063] Take 60 g of component A and 20 g of component B, mix them evenly, and let stand for 15 minutes to obtain the anti-corrosion coating for construction.

[0064] Clean and dry the surface of the C80 concrete substrate, and apply three coats by brushing, with the final coating thickness controlled at 300±40 μm.

[0065] (5) Coating curing

[0066] The coated concrete sample was placed in a room temperature (approximately 25°C) environment for 168 hours to cure, resulting in a dense, uniform, high-performance concrete anti-corrosion coating.

[0067] Example 3

[0068] This embodiment provides a high-performance concrete anti-corrosion coating, including the following steps:

[0069] (1) Preparation of composite solvent

[0070] Take 200.0 g of triethyl phosphate, add 50.0 g of ethyl acetate and 50.0 g of butyl acetate in sequence, stir well to obtain a composite solvent.

[0071] (2) Preparation of component A

[0072] Add 22.5 g of the above composite solvent and 40.29 g of mixed organic solvent (a mixture of ethyl acetate and butyl acetate) to 100 g of E44 epoxy resin. After stirring evenly, add 2.0 g of dispersant (E-3910 polyamide dispersant), 2.0 g of fumed silica and 1.0 g of leveling agent (SI-2041 fluorinated acrylate leveling agent) in sequence. Continue stirring evenly and grinding to disperse to obtain component A.

[0073] (3) Preparation of component B

[0074] Add 13.0 g of anhydrous polyaniline dispersion with a mass fraction of 20% to 30 g of T31 epoxy curing agent with an amine value of approximately 435, and then add 12.93 g of mixed solvent (a mixture of ethanol and n-butanol), and stir until homogeneous to obtain component B.

[0075] (4) Coating mixing and application

[0076] Take 60 g of component A and 20 g of component B, mix them evenly, and let stand for 15 minutes to obtain the anti-corrosion coating for construction.

[0077] Clean and dry the surface of the C80 concrete substrate, and apply three coats evenly by brushing, with the final coating thickness controlled at 300±40 μm.

[0078] (5) Coating curing

[0079] The coated concrete sample was cured at room temperature (25±2℃) for 168 hours to obtain a dense and uniform high-performance concrete anti-corrosion coating.

[0080] Example 4

[0081] This embodiment provides a high-performance concrete anti-corrosion coating, including the following steps:

[0082] (1) Preparation of composite solvent

[0083] Take 200.0 g of tetraethyl orthosilicate, add 50.0 g of ethyl acetate and 50.0 g of butyl acetate in sequence, stir until uniform, and obtain a composite solvent.

[0084] (2) Preparation of component A

[0085] Add 22.5 g of the above composite solvent and 36.26 g of mixed organic solvent (a mixture of ethyl acetate and butyl acetate) to 100 g of E44 epoxy resin. After stirring evenly, add 2.0 g of dispersant (E-3910 polyamide dispersant), 2.0 g of fumed silica and 1.0 g of leveling agent (RF-7106 acrylate leveling agent) in sequence. Continue stirring evenly and grinding to disperse to obtain component A.

[0086] (3) Preparation of component B

[0087] Add 13.0 g of anhydrous polyaniline dispersion with a mass fraction of 20% to 30 g of T31 epoxy curing agent with an amine value of approximately 435, and then add 11.59 g of mixed solvent (a mixture of ethanol and n-butanol), and stir until homogeneous to obtain component B.

[0088] (4) Coating mixing and application

[0089] Take 60 g of component A and 20 g of component B, mix them evenly, and let stand for 15 minutes to obtain the anti-corrosion coating for construction.

[0090] Clean and dry the pre-treated C80 concrete substrate surface, and apply three coats by brushing, with the final coating thickness controlled at 300±40 μm.

[0091] (5) Coating curing

[0092] The coated concrete sample was cured at room temperature (25±2℃) for 168 hours to obtain a dense and uniform high-performance concrete anti-corrosion coating.

[0093] Comparative Example 1

[0094] This comparative example provides a concrete anti-corrosion coating, which differs from Example 1 in that: step (2) is: a mixed solution of 22.5g of ethyl acetate and butyl acetate (mass ratio 1:1) is used to replace the composite solvent in Example 1 to prepare component A, and the remaining components and operating steps are the same as in Example 1.

[0095] Comparative Example 2

[0096] This comparative example provides a concrete anti-corrosion coating, which differs from Example 1 in that: step (1) is: take 100 g of KH560, prepare a solution with 100 g of ethyl acetate and 100 g of butyl acetate, and use it to replace the composite solvent in Example 1 to prepare component A. The remaining components and operating steps are the same as in Example 1.

[0097] Comparative Example 3

[0098] This comparative example provides a concrete anti-corrosion coating, which differs from Example 1 in that: step (1) is: take 100 g TiO2 (anatase type) and 50 g talc powder, and use 100 g ethyl acetate and 50 g butyl acetate to prepare a uniform slurry, which replaces the composite solvent in Example 1, and is used to prepare component A. The remaining components and operating steps are the same as in Example 1.

[0099] Performance testing

[0100] Test samples: anti-corrosion coatings prepared in Examples 1-4 and Comparative Examples 1-3.

[0101] Test method:

[0102] Water resistance, salt water resistance, alkali resistance and acid resistance test (GB / T 1763-1989): The sample is immersed in deionized water, 5.0% sodium chloride solution, 5.0% sodium hydroxide solution and 5.0% hydrochloric acid solution at room temperature, and the changes on the coating surface are observed after a certain time (hours). The coating is intact and has no hollows or cracks.

[0103] Chloride ion permeability test (GB / T50082-2009): The electrical flux method is used to evaluate the water and salt barrier capabilities of the coating by measuring the amount of chloride ions permeating per unit time, with units of mg / (cm³). 2 ·d).

[0104] Coating impedance: Electrochemical impedance spectroscopy (EIS) was used to determine the impedance in a three-electrode system with a perturbation voltage of 10 mV and a frequency range of 10 mV. 5 -10 -2 Hz scans were performed to record the Nyquist plot of the coating and calculate the equivalent circuit impedance in Ω·cm. 2 .

[0105] Adhesion test: The sample is pulled apart using the pull-off method. If the failure location is inside the concrete (pull-off concrete), it indicates that the adhesion is greater than the concrete strength. If it occurs at the coating / substrate interface, the adhesion strength is calculated based on the maximum tensile force required for failure, in MPa.

[0106] The coatings prepared in Examples 1-4 all exhibited excellent performance in terms of water resistance, salt water resistance, alkali resistance, and acid resistance. Example 1, in particular, performed best in all tests, with corrosion resistance exceeding 10,000 hours and chloride ion penetration resistance as low as 1.1 × 10⁻⁶. - 5 mg / (cm 2 ·d), the coating impedance is as high as 3.1×10 10 Ω·cm 2 The adhesion reached 3.1 MPa, demonstrating excellent protective effect. This indicates that the synergistic effect of orthotitanate, phosphate, and orthosilicate in the composite solvent significantly enhances the coating's density, interfacial bonding, and resistance to media penetration.

[0107] In contrast, Comparative Example 1 used only a common mixed solvent, lacking the hydrolytic deposition effect of functional esters, resulting in decreased coating barrier performance, reduced adhesion, and significantly inferior resistance to chloride ion penetration compared to the examples; Comparative Example 2 used KH560 silane coupling agent to replace the composite solvent, which had a certain coupling effect, but could not form a multi-element inorganic deposition layer, and its interface sealing and corrosion resistance were still inferior to the examples; Comparative Example 3 directly used inorganic fillers such as TiO2 and talc, lacking an in-situ reaction film-forming mechanism, resulting in weak adhesion between the coating and the substrate, low impedance and adhesion, and the worst overall protective effect.

[0108] To further verify the stability of the high-performance concrete anti-corrosion coating under extreme environments, the anti-corrosion coating prepared in Example 1 was applied to the concrete substrate of the brine production tank at Shandong Haihua Group and exposed to natural conditions for one year. The salinity of the brine in the tank was much higher than that of ordinary seawater (seawater salinity is about 3.5%), and it was in a near-saturated state for a long time (salt content as high as 26.5%). At the same time, the acidity of the environment was high, with a pH of about 2.0, and even lower than 2.0 at some times. The corrosion intensity was far greater than that of typical marine environments. The test results are as follows: Figure 1 As shown: Figure a shows the side coated with the coating of the present invention, with a complete and dense surface, free from obvious cracks, peeling, blistering, etc.; Figure b shows the side without the anti-corrosion coating, where exposed concrete aggregate, loose structure, and significant corrosion damage are visible. These results further demonstrate that the anti-corrosion coating of the present invention still possesses excellent long-term protective capabilities under harsh high-salt and high-acid environments.

[0109] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A high-performance concrete anti-corrosion coating, comprising component A and component B, wherein component A comprises, by weight: The composition includes 100 parts epoxy resin, 15-30 parts composite solvent, 30-50 parts organic solvent, 1-3 parts dispersant, 1-3 parts fumed silica, and 0.5-2 parts leveling agent; Component B includes 15-25 parts epoxy curing agent, 8-14 parts conductive polymer dispersion, and 6-12 parts organic solvent. The composite solvent is prepared by mixing orthotitanate, phosphate, and orthosilicate with one or more solvents selected from esters, ketones, alcohols, aromatic hydrocarbons, aliphatic hydrocarbons, and ethers; wherein the mass ratio of orthotitanate, phosphate, and orthosilicate is 1:(0.8-1.2):(0.8-1.2). The orthotitanate is one or more of tetraethyl orthotitanate, butyl orthotitanate, and isopropyl orthotitanate; the phosphate ester is one or more of triethyl orthophosphate, tributyl orthophosphate, and trimethyl orthophosphate; the orthosilicate is one or more of tetraethyl orthosilicate, methyl orthosilicate, and butyl orthosilicate. The conductive polymer dispersion is an anhydrous polyaniline dispersion with a mass fraction of 10-30%.

2. The high-performance concrete anti-corrosion coating according to claim 1, characterized in that: The product comprises two components, A and B. By mass, component A includes: 100 parts epoxy resin, 20-25 parts composite solvent, 35-45 parts organic solvent, 1.5-2.5 parts dispersant, 1.5-2.5 parts fumed silica, and 0.8-1.5 parts leveling agent; component B includes: 18-22 parts epoxy curing agent, 10-13 parts conductive polymer dispersion, and 8-11 parts organic solvent.

3. The high-performance concrete anti-corrosion coating according to claim 1 or 2, characterized in that: The organic solvents in components A and B are one or more of alcohols, esters, and ketones; the dispersant is one or more of polycarboxylic acid dispersants, polyamide dispersants, block copolymer dispersants, sulfosuccinate dispersants, or organophosphonate dispersants.

4. The high-performance concrete anti-corrosion coating according to claim 1 or 2, characterized in that: The leveling agent is one or more of acrylate-based, polyether-modified silicone oil-based, or fluorine-modified polymer-based leveling agents; the epoxy curing agent is one of amine-based or imidazole-based.

5. A method for preparing a coating of high-performance concrete anti-corrosion coating according to any one of claims 1-4, comprising the following steps: (1) Mix the epoxy resin, composite solvent and organic solvent in component A, stir and then add the dispersant, fumed silica and leveling agent in sequence, and continue stirring to obtain component A; Component B is obtained by mixing the epoxy curing agent, conductive polymer dispersion and organic solvent in component B; Mix component A and component B and let stand for 15-30 minutes to obtain the anti-corrosion coating. (2) Clean the surface of the concrete substrate and apply the anti-corrosion coating from step (1) to the surface of the concrete substrate. The coating thickness is controlled between 200 and 600 μm. (3) The coating is cured to obtain a high-performance concrete anti-corrosion coating.

6. The method according to claim 5, characterized in that: The curing temperature in step (3) is 20-30°C, and the curing time is 48-168 hours.

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