Preparation method and application of wear-resistant and corrosion-resistant glass flake coating

Abstract

The invention provides a preparation method and application of a wear-resistant and corrosion-resistant glass flake coating, and belongs to the technical field of coatings. The coating comprises a component A and a component B, wherein the component A comprises an epoxy resin matrix, a reinforcing filler, a self-repairing microcapsule and an auxiliary agent; the epoxy resin matrix is formed by compounding at least two different types of epoxy resin components, the first epoxy resin component is matrix resin, and the second epoxy resin component is toughening modified resin; the reinforcing filler comprises glass flakes subjected to surface modification, functionalized graphene and nano zirconium dioxide particles; the self-repairing microcapsule comprises a microcapsule wall and a self-repairing agent coated in the microcapsule wall; the auxiliary agent comprises a rheological auxiliary agent, a defoaming agent and a wetting dispersant; and the component B comprises a curing agent and a curing accelerator. The comprehensive wear resistance and corrosion resistance of the coating can be remarkably improved, and the construction adaptability of the coating is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to a preparation method and application of a wear-resistant and corrosion-resistant glass flake coating. BACKGROUND

[0002] With the increasing demand for industrial corrosion protection, glass flake coating has been widely used in heavy-duty corrosion protection due to its excellent shielding performance and corrosion resistance. However, the existing glass flake coating still has some deficiencies in the comprehensive performance of wear resistance and corrosion resistance. In complex working conditions, the coating is prone to wear and corrosion acceleration, which affects its service life and protection effect.

[0003] The invention patent with publication number CN103288365B discloses a surface treatment method of glass flake for flake resin coating and flake resin coating. By using two kinds of silane coupling agents for double modification treatment of glass flake, the surface of glass flake has both hydrophilic groups and hydrophobic groups, thereby improving the bonding force between glass flake and resin matrix and enhancing the compactness and permeation resistance of the coating. However, this technical solution mainly focuses on the surface functionalization treatment of glass flake and does not fully consider the wear resistance of the coating in high wear environment. Moreover, the modification process is complex and may increase production cost. In addition, the coating may have local peeling phenomenon due to mechanical stress during long-term use, which affects its corrosion resistance.

[0004] The invention patent with publication number CN102260451B discloses a solvent-free epoxy glass flake coating and manufacturing method. By using a solvent-free formula, the volatile organic compound (VOC) emission during coating curing process is reduced, and the construction performance and permeation resistance of the coating are improved by adding active diluent and rheological additives. However, this technical solution is weak in wear resistance, especially in high impact or high friction environment, the mechanical strength and durability of the coating may be insufficient. In addition, the curing conditions of this coating have high requirements on the construction environment, which may limit its application in low temperature or humid environment.

[0005] The existing glass flake coating still has some deficiencies in wear resistance, corrosion resistance and construction adaptability. SUMMARY

[0006] The present application relates to the field of coating technology, in particular to a preparation method and application of a wear-resistant and corrosion-resistant glass flake coating.

[0007] To solve the above technical problems, the technical solution adopted by the present application is:

[0008] A method for preparing a wear-resistant and corrosion-resistant glass flake coating, the coating comprising A component and B component, the A component including an epoxy resin matrix, a reinforcing filler, self-repairing microcapsules and an auxiliary agent; the epoxy resin matrix being compounded from at least two different types of epoxy resin components, the first epoxy resin component being a main resin and the second epoxy resin component being a toughening modified resin; the reinforcing filler including surface-modified glass flake, functionalized graphene and nano-zirconium dioxide particles; the self-repairing microcapsule including a microcapsule wall and a self-repairing agent coated inside; the auxiliary agent including a rheological auxiliary agent, a defoaming agent and a wetting dispersant; the B component including a curing agent and a curing accelerator;

[0009] The specific preparation method is as follows:

[0010] Step 1, surface functionalization treatment of glass flake: immerse or spray the glass flake in a 0.5%-2.0% mass concentration silane coupling agent aqueous solution for 10-30 min, and then dry at 100°C-120°C for 2-4 h;

[0011] Step 2, dispersion of functionalized nano filler: add the functionalized graphene and nano-zirconium dioxide particles in a part of the first epoxy resin component, and disperse by a planetary mixer or a sand mill at a high shear rate of 1000 rpm-3000 rpm for 1-3 h;

[0012] Step 3, main body mixing of A component: add the remaining first epoxy resin component, the second epoxy resin component, the wetting dispersant and the defoaming agent into a mixing container, stir at 500 rpm-1000 rpm for 30-60 min, and defoam under a vacuum of-0.08 MPa to-0.09 MPa;

[0013] Step 4, mixing of reinforcing phase: add the surface-functionalized glass flake of step 1 and the self-repairing microcapsule to the mixture obtained in step 3, stir at a low speed of 100 rpm-300 rpm for 30-60 min, and then add the rheological auxiliary agent and continue to stir at 500 rpm-800 rpm for 30-60 min;

[0014] Step 5, preparation of B component: mix the curing agent and the curing accelerator at 300 rpm-600 rpm for 10-20 min;

[0015] Step 6, on-site construction mixing: mix the A component and the B component according to the preset ratio, and stir at 500 rpm-800 rpm for 3-5 min.

[0016] Further, the silane coupling agent is a mixture of (3-glycidoxypropyl)trimethoxysilane and (3-aminopropyl)triethoxysilane; the glass flake is C type or ECR type, with a thickness of 3 μm-5 μm, an average particle size D50 of 80 μm-120 μm and an aspect ratio of 20-100.

[0017] Further, the epoxy equivalent weight (EEW) of the first epoxy resin component is 180 g / eq-200 g / eq, and the viscosity at 25°C is 10 Pa·s-15 Pa·s;

[0018] The epoxy equivalent weight (EEW) of the second epoxy resin component is 250 g / eq-350 g / eq, and the viscosity at 25°C is 30 Pa·s-50 Pa·s;

[0019] The mass ratio of the first epoxy resin component to the second epoxy resin component is 100:10-100:30.

[0020] Further, the functionalized graphene is graphene oxide (GO) or reduced graphene oxide (rGO), with a lateral size of 1 μm-5 μm and a thickness of <5 nm, and the surface is grafted with epoxy groups, hydroxyl groups or amino functional groups;

[0021] The nano-zirconium dioxide particles are spherical or spherical-like, with an average particle size of 20 nm-50 nm, and the surface is treated with a silane coupling agent;

[0022] The functionalized graphene accounts for 0.1%-0.5% of the total mass of the coating, and the nano-zirconium dioxide accounts for 0.5%-2.0%.

[0023] Further, the wall material of the self-repairing microcapsule is polyurea-formaldehyde or poly(melamine-formaldehyde) resin, with an average diameter of 50 μm-200 μm and a wall thickness of 1 μm-5 μm; the internal self-repairing agent comprises a bisphenol F type epoxy resin (EEW 160 g / eq-170 g / eq, viscosity at 25°C <5 Pa·s) and a latent curing agent imidazole derivative or a polythiol; the self-repairing microcapsule accounts for 1%-5% of the total mass of the coating.

[0024] The application further discloses an application method of the wear-resistant and corrosion-resistant glass flake coating.

[0025] Step 101, substrate pretreatment: sand blasting or shot blasting is performed on the metal substrate to reach Sa2.5 level, and the roughness Rz is 40 μm-70 μm;

[0026] Step 102, coating construction: the coating prepared by the above method is coated on the substrate in a single layer with a thickness of 200 μm-500 μm, and the interval between multiple coatings is 6 h-24 h;

[0027] Step 103, coating curing: curing is performed in an environment with a temperature of 5°C-40°C and a relative humidity of 30%-85%, the surface drying time is 6 h-8 h, the real drying time is 24 h-48 h, and the complete curing time is 7 days.

[0028] Further, in step 101, the metal substrate is carbon steel, stainless steel or alloy steel, and the concrete substrate needs to be cleaned of floating dust and subjected to pH neutralization treatment, so that the surface pH value of the concrete substrate reaches 7-10.

[0029] Further, in step 102, the coating method is air-assisted spraying, airless spraying, rolling or brushing, and when the total coating thickness is greater than or equal to 800 microns, the coating is divided into at least two layers, and the coating method can be the same or different, and the interval between adjacent two layers is 6-24 hours.

[0030] Further, in step 103, when the environmental temperature in the curing condition is lower than 10°C, a low-temperature curing accelerator is used to accelerate the reaction.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] The present application realizes the multi-scale strengthening of the coating by introducing nano-zirconium dioxide particles and functionalized graphene into the epoxy resin matrix. The nano-zirconium dioxide particles endow the coating with excellent surface hardness and scratch resistance due to their high hardness and uniform dispersibility, effectively resisting abrasive wear and impact wear. The functionalized graphene plays a toughening role at the nanoscale through its two-dimensional structure and high strength characteristics, significantly improving the fracture toughness, impact strength and fatigue life of the coating through stress dispersion and crack deflection mechanisms, so that the coating can maintain structural integrity when subjected to dynamic mechanical stress, reducing surface defects caused by wear. In addition, the self-repairing microcapsules can automatically release the repair agent when the coating suffers micro-damage, effectively healing micro-cracks and fundamentally preventing further damage, maintaining the long-term mechanical integrity of the coating.

[0033] At the same time, the present application constructs a more firm and reactive chemical bonding interface between the glass flake and the epoxy resin matrix by surface treatment of the glass flake with a multifunctional silane coupling agent, effectively inhibiting the penetration and diffusion of corrosive media along the interface and improving the anti-permeation ability of the coating. The highly tortuous nanoscale penetration path formed by the functionalized graphene in the coating greatly prolongs the time required for the corrosive medium to reach the substrate, further improving the physical shielding effect of the coating. More importantly, after repairing the micro-cracks and defects caused by wear, the self-repairing microcapsules can restore the density and integrity of the coating, thereby eliminating the potential penetration weak points of the corrosive medium and ensuring that the coating can continuously provide efficient corrosion protection under wear conditions. The optimized epoxy resin compounding system and curing agent system ensure high crosslinking density and low free volume of the coating after curing, further enhancing the density and resistance to various chemical corrosion media of the coating.

[0034] The application effectively solves the performance limitation of the existing glass flake coating in response to the coupling effect of dynamic wear and corrosion. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0036] Figure 1 The overall flowchart of the preparation method of the present application. DETAILED DESCRIPTION

[0037] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0038] The following will be described in detail with reference to the accompanying drawings Figure 1 The embodiments of the present application are described in detail.

[0039] The present application discloses a kind of wear-resistant corrosion-resistant glass flake coating, mainly by component A and component B constitute.Wherein, component A mainly includes epoxy resin matrix, reinforcing filler, self-repairing microcapsule and auxiliary agent, component B is mainly composed of curing agent and curing accelerator.

[0040] Epoxy resin matrix constitutes the core skeleton of coating, the epoxy resin matrix used in the present application is compounded by at least two different types of epoxy resin with specific mass ratio.The first epoxy resin component is used as main resin, and the epoxy equivalent is controlled in the range of 180g / eq-200g / eq, and the viscosity at 25°C is between 10Pa·s-15Pa·s. Among them, one suitable main resin is bisphenol A type epoxy resin, which has good versatility and mechanical property basis.

[0041] The second epoxy resin component is introduced as toughening modified resin, and the epoxy equivalent is in the range of 250g / eq-350g / eq, and the viscosity at 25°C is in the range of 30Pa·s-50Pa·s.

[0042] The toughening modified resin can be obtained in various ways, for example, by carboxyl-terminated butyl nitrile rubber (CTBN) modification, or by hyperbranched polymer modification of the epoxy resin obtained. Both modification techniques aim to endow the epoxy resin matrix with higher toughness, thereby effectively absorbing and dispersing external impact energy, reducing stress concentration, and thus improving the impact resistance and crack resistance of the coating, enabling it to maintain structural integrity in a wear environment.

[0043] In terms of proportioning, the mass ratio of the first epoxy resin component to the second epoxy resin component is preferably 100:10-100:30. This ensures that the cured coating has both high crosslinking density to resist penetration of corrosive media and excellent toughness to cope with external mechanical stress, thereby effectively reducing stress concentration and significantly improving the impact performance and crack resistance of the coating.

[0044] The reinforcing filler system is a multi-scale composite reinforcing structure that includes surface-modified glass flake, functionalized graphene, and nano-zirconium dioxide particles. These components each play a unique role and improve the overall performance of the coating through synergistic effects.

[0045] The first type of reinforcing filler is glass flake. Preferably, C-type or ECR-type glass flake is used, with a thickness range of 3-5 μm, an average particle size D50 range of 80-120 μm, and an aspect ratio (ratio of average diameter to average thickness) of 20-100.

[0046] The mass content of glass flake in the coating is controlled between 15% and 30%.

[0047] Before being added to the epoxy resin matrix, the glass flake needs to undergo strict surface treatment, which is carried out by using one or more silane coupling agents.

[0048] As a preferred embodiment of the present application, the silane coupling agent is a mixture of (3-glycidoxypropyl)trimethoxysilane and (3-aminopropyl)triethoxysilane.

[0049] Among them, (3-glycidoxypropyl)trimethoxysilane mainly functions to form stable covalent bonds with the epoxy resin matrix, thereby constructing a firm interfacial connection; while (3-aminopropyl)triethoxysilane is used to enhance the interfacial bonding between the glass flake and the polar functional groups, further optimizing the overall stability of the composite system.

[0050] The silane coupling agent is configured as an aqueous solution with a mass concentration of 0.5%-2.0% for impregnation or spray treatment of the glass flake.

[0051] The treated glass flake needs to be dried at a specific temperature of 100°C-120°C to promote the hydrolysis and condensation reaction of the silane coupling agent and form a dense organic silicon modified layer on the surface of the glass flake. The interfacial bonding strength and stability between the glass flake and the epoxy resin matrix are improved, which helps to effectively transfer stress when the coating is subjected to external stress, while inhibiting interfacial debonding, thereby enhancing the overall impermeability and mechanical properties of the coating.

[0052] The second type of reinforcing filler is functionalized graphene, which can be graphene oxide (GO) or reduced graphene oxide (rGO). The surface is introduced with reactive functional groups such as epoxy, hydroxyl or amino groups through chemical grafting or physical adsorption to ensure good compatibility and reactivity with the epoxy resin matrix or the molecular chain of the curing agent.

[0053] The lateral dimension of the functionalized graphene is preferably 1-5 μm, and the thickness is less than 5 nm. The mass content of functionalized graphene in the coating is 0.1%-0.5%.

[0054] The introduction of functionalized graphene utilizes its large specific surface area, excellent mechanical strength and excellent barrier properties to form a two-dimensional network structure at the nanoscale in the epoxy resin matrix. This network structure can significantly increase the tortuous path of the corrosion medium penetrating through the coating, thereby greatly extending the time required for the corrosion medium to reach the substrate. At the same time, through its nanoscale reinforcement mechanism, functionalized graphene significantly improves the overall mechanical properties of the coating, especially the tensile strength, bending strength and fracture toughness, thereby achieving synergistic enhancement of the wear resistance and corrosion resistance of the coating.

[0055] The third type of reinforcing filler is nano-zirconium dioxide (ZrO2) particles.

[0056] The nano-zirconium dioxide particles usually have a spherical or spherical-like morphology, and the average particle size is controlled in the range of 20-50 nm. In order to improve its dispersion uniformity in the epoxy resin and the interfacial bonding strength with the resin matrix, the surface of the nano-zirconium dioxide particles also needs to be treated with a silane coupling agent, such as (3-aminopropyl) triethoxysilane or vinyl trimethoxysilane.

[0057] The mass content of the nano-zirconium dioxide particles in the coating is 0.5%-2.0%. The introduction of nano-zirconium dioxide particles aims to utilize its inherent high hardness and high modulus characteristics to significantly improve the surface hardness, scratch resistance and wear resistance of the coating. Its nanoscale effect enables these particles to be uniformly dispersed in the resin matrix, forming a uniformly distributed hard phase, thereby effectively resisting external mechanical wear.

[0058] The self-healing microcapsule is composed of a microcapsule wall and a self-healing agent encapsulated inside. The material of the microcapsule wall is preferably polyurea-formaldehyde or poly(melamine-formaldehyde) resin, which has good mechanical properties and chemical stability and can effectively encapsulate the internal healing agent.

[0059] The average diameter of the microcapsule is in the range of 50-200 μm, and the wall thickness is controlled in the range of 1-5 μm to ensure timely rupture and release of the healing agent when the coating is subjected to local mechanical damage (such as micro-cracks), while maintaining sufficient stability during the preparation and application of the coating.

[0060] The self-healing agent comprises at least two components: a low-viscosity epoxy prepolymer and a latent curing agent or catalyst. The low-viscosity epoxy prepolymer is, for example, a bisphenol F type epoxy resin with an epoxy equivalent weight (EEW) in the range of 160-170 g / eq and a viscosity less than 5 Pa·s at 25°C. This low-viscosity property helps the healing agent to quickly penetrate and fill the micro-cracks after the rupture of the microcapsule. The latent curing agent or catalyst is, for example, a blocked polyamine curing agent, which does not react with the epoxy prepolymer under normal storage conditions, thereby ensuring the storage stability of the microcapsule. Once the microcapsule is ruptured and released, the latent curing agent or catalyst can quickly react with the epoxy groups in the epoxy prepolymer or the main matrix of the coating and cure, thereby achieving rapid repair of the damage. Imidazole derivatives or polythiols encapsulated by the microcapsule wall are preferred examples of latent curing agents or catalysts.

[0061] The mass content of the self-healing microcapsule in the coating is controlled in the range of 1-5%. The introduction of the self-healing microcapsule endows the coating with the ability to automatically release the internal self-healing agent and react with the coating matrix or itself when subjected to local mechanical damage (such as micro-cracks, scratches), thereby filling and repairing the micro-damage, inhibiting crack propagation, and maintaining the integrity of the coating. This mechanism fundamentally prolongs the service life and corrosion resistance of the coating in a dynamic wear environment.

[0062] The adjuvants used in the present application mainly include rheological adjuvants, defoamers, and wetting dispersants. Specifically, the rheological adjuvant is, for example, a surface-treated (hydrophobic) fumed silica with a specific surface area in the range of 150-300 m² / g. The mass content of the rheological adjuvant in the coating is in the range of 0.5-2.0%. The core function of the rheological adjuvant is to endow the coating with good thixotropy, so that the coating exhibits high viscosity under static conditions, thereby effectively preventing sagging and ensuring the uniformity of the coating film thickness. At the same time, under the action of shear force (such as during spraying or rolling), its viscosity can quickly decrease to facilitate application, and quickly recover after application is completed to ensure excellent leveling of the coating film, thereby obtaining a smooth and beautiful coating surface.

[0063] Defoamer is a non-silicon defoamer based on polyether modified polysiloxane. The mass content in the coating is controlled between 0.1%-0.5%. The introduction of the defoamer aims to effectively inhibit and eliminate the bubbles generated inside the system during the preparation, stirring and construction of the coating. Effective removal of bubbles is crucial to ensure the density, flatness and defect-free of the final coating film, directly affecting the corrosion resistance and mechanical properties of the coating.

[0064] Wetting dispersant is a wetting dispersant of polyurethane or block copolymer. The mass content in the coating is 0.2%-1.0%. The wetting dispersant is used to promote the uniform dispersion of solid reinforcing fillers such as glass flake, functionalized graphene and nano zirconia particles in the epoxy resin matrix, effectively preventing particle agglomeration. Uniformly dispersed fillers not only fully exert their reinforcing efficiency, but also significantly reduce the viscosity of the system, thereby improving the construction performance of the coating and ultimately enhancing the mechanical properties and appearance quality of the cured coating.

[0065] The curing agent used in the present application is a modified cycloaliphatic polyamine or polyamide amine with an Active Hydrogen Equivalent Weight (AHEW) ranging from 60g / eq to 80g / eq. The equivalent ratio of the curing agent to the epoxy groups in the A component is preferably controlled between 0.9:1 and 1.1:1 to ensure sufficient crosslinking reaction and achieve optimal curing effect and performance.

[0066] Curing accelerator is used to further optimize the rate and efficiency of the curing reaction. The present application preferably uses tri(dimethylaminomethyl) phenol or urea derivatives as the curing accelerator. The mass content in the curing agent component is 0.5%-2.0%. The introduction of the curing accelerator aims to further accelerate the curing reaction rate, especially significantly improve the curing efficiency in low temperature or high humidity environment, so as to ensure that the coating can reach the optimal performance in a shorter time, shorten the construction cycle, and ensure the reliability of the coating performance.

[0067] The present application provides a preparation method of wear-resistant and corrosion-resistant glass flake coating, which finely controls the process parameters of each step to ensure the optimal dispersion, stability and synergistic effect of each component.

[0068] Step one: surface functionalization treatment of glass flake.

[0069] First, prepare the desired amount of glass flake. Next, immerse or spray the glass flake in an aqueous solution containing 0.5% - 2.0% (mass concentration) of silane coupling agent (for example, a mixture of (3-glycidoxypropyl)trimethoxysilane and (3-aminopropyl)triethoxysilane). The immersion time is preferably controlled between 10 minutes and 30 minutes to ensure that the silane coupling agent is sufficiently wetted and adsorbed on the surface of the glass flake. Subsequently, the treated glass flake is subjected to a drying process at a temperature of 100°C - 120°C for 2 hours - 4 hours. The hydrolysis and condensation reaction of the silane coupling agent is promoted, forming a stable and reactive siloxane layer on the surface of the glass flake. The interfacial bonding strength between the glass flake and the subsequently added epoxy resin matrix is enhanced, thereby improving the overall permeation resistance and mechanical properties of the coating, effectively resisting the penetration of corrosive media along the interface and the debonding of the interface under external stress.

[0070] Step two: dispersion preparation of functionalized nanofiller.

[0071] To ensure that the nanoscale reinforcing filler (functionalized graphene and nanometer-sized zirconium dioxide particles) achieves uniform and stable dispersion in the epoxy resin, thereby fully exerting its nanometer-scale reinforcing effect. First, a portion of the first epoxy resin component is added to a high-shear mixing device, which can be a planetary mixer or a sand mill, to provide sufficient dispersion shear force. Subsequently, the functionalized graphene and the nanometer-sized zirconium dioxide particles are slowly and uniformly added to the portion of the epoxy resin. Dispersion is carried out by the high-shear mixing device, and the dispersion time is preferably 1 hour - 3 hours, with a dispersion rotation speed controlled at 1000 rpm - 3000 rpm.

[0072] During this process, the dispersion effect needs to be closely monitored to ensure that the functionalized graphene and nanometer-sized zirconium dioxide particles form a uniform and stable nanometer dispersion in the epoxy resin, effectively avoiding particle agglomeration, thereby laying a foundation for the subsequent preparation of component A and fully exerting its reinforcing effect in the final coating, including improving the mechanical properties and barrier properties of the coating.

[0073] Step three: mixing preparation of component A body.

[0074] The remaining portion of the first epoxy resin component, the second epoxy resin component, the wetting dispersant and the defoaming agent are sequentially added to a clean mixing vessel. The mixing is carried out by a stirring device for 30-60 minutes at a stirring speed of 500-1000 rpm. During the mixing, in order to remove the air bubbles introduced by the stirring and the trace amount of gas possibly existing in the epoxy resin itself, a vacuum, for example, -0.08 MPa to -0.09 MPa, is preferably applied. The vacuum defoaming is a key step to ensure the compactness of the final coating film and to eliminate the porosity defects. It guarantees the formation of a uniform, bubble-free epoxy resin premix system, which is ready for the subsequent addition of solid fillers.

[0075] Step four: addition and mixing of glass flake, self-healing microcapsule and rheological additive.

[0076] The surface-functionalized glass flake and the self-healing microcapsule obtained in step one are slowly and uniformly added to the uniform bubble-free mixture obtained in step three. During the addition, the stirring speed is strictly controlled in the low speed range, for example, 100-300 rpm, and the stirring is continued for 30-60 minutes. The purpose of the low speed stirring is to prevent the breakage of the glass flake, especially to avoid the damage to the integrity of its flaky structure, while at the same time to maximize the protection of the integrity of the self-healing microcapsule to prevent its premature rupture. The integrity of the glass flake is important for its formation of an effective barrier layer in the coating, while the integrity of the self-healing microcapsule directly determines the effectiveness of its self-healing function. Subsequently, the rheological additive is added while maintaining the low speed stirring. After the addition of the rheological additive, the stirring speed can be moderately increased to 500-800 rpm, and the stirring is continued for 30-60 minutes to ensure the uniform dispersion of the rheological additive in the system and to exert its thixotropic effect. The final A component is formed with good thixotropy, high viscosity in static state to prevent sagging, and low viscosity under the action of shear force to facilitate the construction.

[0077] Step five: preparation of B component.

[0078] It mainly involves the uniform mixing of the curing agent and the curing accelerator. The curing agent and the curing accelerator are added to another clean mixing vessel. The mixing is carried out by a stirring device for 10-20 minutes at a stirring speed of 300-600 rpm. This step ensures that the curing agent and the accelerator are highly uniformly mixed in the B component, so that after the final mixing of the A and B components, the curing reaction can proceed uniformly and quickly, and finally a cured coating with the expected performance is formed.

[0079] Step six: on-site mixing and application.

[0080] Before actual construction application, the A component and the B component are mixed on site according to the preset ratio. The ratio is accurately determined according to the epoxy equivalent weight of the epoxy resin in the A component and the active hydrogen equivalent weight of the curing agent in the B component, and is usually controlled between 0.9:1 and 1.1:1. The mixing time on site is preferably 3-5 minutes, and the mixing speed is controlled between 500 rpm and 800 rpm.

[0081] The A component and the B component are ensured to be fully reacted to start the curing process. After mixing, the coating should be applied within the specified workable time (usually referred to as “activation period” or “pot life”). This time window depends on the ambient temperature and the coating formulation, and is the key to ensure that the coating has sufficient flowability before curing for construction.

[0082] The application method of the wear-resistant and corrosion-resistant glass flake coating disclosed in the present application is intended to ensure that the coating can fully exert its excellent performance in actual engineering and provide long-lasting protection.

[0083] Step 1: Surface pretreatment of the substrate.

[0084] The metal or concrete substrate to be coated needs to be thoroughly cleaned and roughened. For metal substrates, sandblasting (Sa2.5 level) or shot blasting is preferred. The Sa2.5 level standard requires the removal of all visible grease, dirt, scale, rust, coatings, and any other foreign matter. The treated surface should exhibit a uniform metallic luster and meet the specified roughness, such as Rz 40-70 μm. The surface roughness significantly enhances the adhesion of the coating to the substrate by providing mechanical interlocking points. In addition, it is also necessary to ensure that the surface is completely free of oil, rust, and scale. For concrete substrates, sanding is usually required to remove surface laitance, loose layers, and contaminants, followed by thorough dusting and ensuring that the surface is dry, free of loose materials, and free of oil. The pH value of the concrete substrate should also be within an acceptable range (e.g., pH 7-10) to avoid adverse effects on the curing and long-term performance of the coating. A clean, rough, and sufficiently surface-energized substrate is provided for the coating to maximize the chemical bonding and mechanical interlocking between the coating and the substrate, thereby ensuring excellent adhesion of the coating and effectively preventing the coating from falling off due to interface failure during service.

[0085] The pH value is neutralized by using a pH adjuster, such as 1%-3% hydrochloric acid solution or 2%-5% sodium bicarbonate solution.

[0086] Step 2: Coating construction.

[0087] After the surface pretreatment of the substrate is completed, the A component and the B component obtained by the preparation method according to the present application are mixed uniformly in a precise ratio at the construction site. After the mixing is completed, the coating can be uniformly applied to the surface of the pretreated substrate by various construction methods. The preferred construction methods include air-assisted spraying, airless spraying, rolling or brushing. The selection of the construction method is usually determined by the specific conditions at the construction site, the required coating thickness, the construction efficiency requirement and the complexity of the shape of the substrate.

[0088] During the construction process, the single-layer coating thickness is usually controlled between 200 μm and 500 μm. In order to achieve the required total coating thickness or achieve better protection effect, multi-layer coating can be performed. When performing multi-layer coating, the interval time between each layer of coating needs to strictly follow the recoat interval requirement of the coating system, which is usually determined by the ambient temperature and humidity, for example, 6 hours to 24 hours may be required in a specific environment. Strictly controlling the recoat interval is the key to ensuring the interlayer adhesion and preventing coating defects such as delamination and cracking.

[0089] Step three: coating curing.

[0090] The coating after the coating is completed needs to be cured under specific environmental conditions to achieve the expected mechanical properties and corrosion resistance. The coating prepared according to the present application can be cured under the wide conditions of ambient temperature 5°C to 40°C and relative humidity 30% to 85%.

[0091] In order to facilitate further understanding of the present application by those skilled in the art, the present application is further described below in combination with specific examples and comparative experiments.

[0092] Example 1: Preparation and performance test of wear-resistant and corrosion-resistant glass flake coating

[0093] 1. Coating component composition: The specific ratio of the A component and the B component prepared in this example is as follows (mass percentage):

[0094] A component:

[0095] Epoxy resin matrix: first epoxy resin component (bisphenol A type epoxy resin, EEW: 190 g / eq, viscosity at 25°C: 12 Pa·s): 65.0%; second epoxy resin component (CTBN modified epoxy resin, EEW: 300 g / eq, viscosity at 25°C: 40 Pa·s): 15.0%.

[0096] Reinforcing filler: surface functionalized glass flake (ECR type, thickness 4 μm, D50100 μm, aspect ratio 50): 20.0%.

[0097] Surface treatment agent: 0.75% (3-glycidoxypropyl) trimethoxysilane and 0.75% (3- aminopropyl) triethoxysilane aqueous solution (mass concentration 1.5%) treatment.

[0098] Functionalized graphene (graphene oxide, surface introduced epoxy groups, lateral dimension 2 pm, thickness < 2 nm): 0.2%.

[0099] Nano zirconium dioxide particles (spherical, average particle size 30 nm, surface treated with (3- aminopropyl) triethoxysilane): 1.0%.

[0100] Self-repairing microcapsules: polyurea-formaldehyde wall material, average diameter 100 pm, wall thickness 3 pm, coated with bisphenol F type epoxy prepolymer (EEW 165 g / eq, viscosity 3 Pa-s) and imidazole derivative latent curing agent: 3.0%.

[0101] Auxiliaries: rheological auxiliary (hydrophobic fumed silica, specific surface area 200 m2 / g): 1.0%; defoamer (polyether-modified polysiloxane silicone-free defoamer): 0.2%; wetting dispersant (block copolymer type): 0.6%.

[0102] B component:

[0103] Curing agent (modified cycloaliphatic polyamine, AHEW: 70 g / eq): 97.5%; curing accelerator (tris(dimethylaminomethyl)phenol): 2.5%.

[0104] Mixing ratio of A component to B component: A component and B component are mixed in a mass ratio of 4:1, at which point the equivalent ratio of epoxy groups to active hydrogen is about 1.0:1.0.

[0105] 2. Preparation method:

[0106] Step one: surface functionalization treatment of glass flake.

[0107] ECR type glass flake 1000 g is placed in an immersion tank, and a previously prepared silane coupling agent aqueous solution 2000 g (containing (3-glycidoxypropyl) trimethoxysilane 15 g and (3- aminopropyl) triethoxysilane 15 g) is added. The immersion time is set to 20 minutes. After immersion is complete, the glass flake is removed and placed in an oven, and dried at 110 °C for 3 hours, to ensure that a dense siloxane layer of silane coupling agent is formed on the surface of the glass flake.

[0108] Step two: dispersion preparation of functionalized nanofiller.

[0109] Take the first epoxy resin component (bisphenol A type epoxy resin) 200 g into a planetary mixer. Slowly add functionalized graphene 0.2 g and nano zirconium dioxide particles 1.0 g. Start the planetary mixer, set the dispersion speed to 2000 rpm, and the dispersion time to 2 hours, to ensure that the functionalized nano filler forms a uniform and stable nanodispersion in the epoxy resin, without visible agglomeration.

[0110] Step three: Preparation of the main body of component A.

[0111] In another large mixing container, add the remaining first epoxy resin component 450 g, second epoxy resin component 150 g, wetting dispersant 6 g, and defoaming agent 2 g. Start the stirrer, set the stirring speed to 800 rpm, and stir for 30 minutes. During stirring, gradually apply vacuum -0.085 MPa for 20 minutes to effectively remove the bubbles generated during mixing.

[0112] Step four: Addition and mixing of glass flake, self-repairing microcapsules, and rheological additives.

[0113] Slowly add the nanodispersion prepared in step two to the mixture obtained in step three, while keeping the stirrer running at low speed of 200 rpm. Then, slowly and evenly add the surface-functionalized glass flake obtained in step one 200 g and self-repairing microcapsules 30 g. Continue low-speed stirring for 45 minutes to avoid damage to the glass flake and microcapsules. Next, add rheological additives 10 g, and increase the stirring speed to 700 rpm, continue stirring for 40 minutes to ensure uniform dispersion of all components and form a component A with good thixotropy.

[0114] Step five: Preparation of component B.

[0115] In a separate mixing container, add curing agent 97.5 g and curing accelerator 2.5 g. Start the stirrer, stir at a speed of 450 rpm for 15 minutes to ensure uniform mixing of the curing agent and accelerator, and prepare component B.

[0116] 3. Application method:

[0117] Step one: Surface pretreatment of the substrate.

[0118] Select Q235 carbon steel plate as the substrate, use sandblasting process to treat the steel plate to Sa2.5 level, and achieve surface roughness Rz 60 μm. Before coating, use acetone to wipe the surface to remove all residual oil and dust.

[0119] Step two: Coating application.

[0120] At the construction site, the A component prepared in step four and the B component prepared in step five were weighed according to a mass ratio of 4:1 and introduced into a mixing bucket. An electric mixer was used to mix for 4 minutes at a speed of 600 rpm to ensure that the A and B components were fully and uniformly mixed. The mixed paint was applied to the surface of the pretreated steel plate by airless spraying. The single-layer coating thickness was controlled at 300 pm. Two layers were coated in total, and the total coating thickness reached 600 pm. After the first layer was coated, the test plate was left to stand for 8 hours at 25 °C and a relative humidity of 60%, and the second layer was coated after the surface was dry.

[0121] Step three: coating curing.

[0122] After coating, the test plate was cured at 25 °C and a relative humidity of 60%. The dry time was about 7 hours, and the dry-to-touch time was about 36 hours. The test plate was completely cured (after 7 days), and subsequent performance tests were performed.

[0123] Comparative Example 1: Preparation and performance testing of a traditional glass flake epoxy coating

[0124] 1. Coating component composition:

[0125] The specific proportions of the A component and the B component of the traditional glass flake epoxy coating prepared in this comparative example are as follows (mass percentage):

[0126] A component:

[0127] Epoxy resin matrix: bisphenol A type epoxy resin (EEW: 190 g / eq, 25 °C viscosity: 12 Pa·s): 80.0%.

[0128] Reinforcing filler: surface-treated glass flake (C type, thickness 4 pm, D50100 pm, aspect ratio 50): 18.0%.

[0129] Auxiliary agent: rheological auxiliary agent (fumed silica): 1.0%, defoaming agent (polysiloxane type): 0.2%, wetting dispersant: 0.8%.

[0130] B component: curing agent (general aliphatic polyamine, AHEW: 80 g / eq): 97.5%, curing accelerator (none): 2.5%.

[0131] Mixing ratio of A component and B component: the A component and the B component were mixed according to a mass ratio of 4.5:1, and the equivalent ratio of epoxy groups to active hydrogen was about 1.0:1.0 at this time.

[0132] 2. Preparation method and application method:

[0133] The preparation and application methods are similar to Example 1, but the silane coupling agent treatment step of the glass flake, the dispersion preparation step of the nanofiller, the addition of the self-repairing microcapsule, and the addition of the related auxiliary and the second epoxy resin component are omitted. The curing accelerator is also not added. During the construction process, the single-layer coating thickness is also controlled at 300 μm, a total of two layers, and the total thickness is 600 μm. The curing conditions are the same as in Example 1.

[0134] Performance tests and data comparison:

[0135] The coatings prepared in Example 1 and Comparative Example 1 were subjected to a number of key performance tests, including abrasion resistance, corrosion resistance, adhesion, pencil hardness, impact strength, flexibility, and water absorption, etc.

[0136] Abrasion resistance test: Taber abrasion tester (CS-10 type abrasion wheel, 1000 g load, 1000 revolutions) was used to test the abrasion weight loss (mg).

[0137] Corrosion resistance test: salt spray test: according to ASTM B117 standard, to evaluate the corrosion expansion (mm).

[0138] Acid immersion test: the coating was immersed in a 5% sulfuric acid solution, and the coating state after 2000 hours was observed (visual evaluation, grade 0-5, 5 for no change).

[0139] Alkali immersion test: the coating was immersed in a 5% sodium hydroxide solution, and the coating state after 2000 hours was observed (visual evaluation, grade 0-5, 5 for no change).

[0140] Adhesion test: crosshatch method (ISO 2409) was used, to evaluate the adhesion grade (0-5 grade, 0 grade is the best).

[0141] Pencil hardness test: according to ASTM D3363 standard, from softest to hardest.

[0142] Impact strength test: forward impact test (ASTM D2794) was used, to record the maximum uncracked impact height (cm·kg).

[0143] Flexibility test: conical shaft bending test (GB / T 6742) was used, to record the bending shaft diameter (mm), the smaller the bending degree, the better the flexibility.

[0144] Water absorption: the coating sample was immersed in 25°C distilled water for 7 days, and the weight gain percentage was measured.

[0145] Self-repairing function verification: scratches (about 50 μm deep) were made on the coating surface, and the healing of the scratches and the recovery of the local corrosion protection ability after healing were observed.

[0146] The test results are summarized in the following table: Performance indicators Test method Unit Comparative Example 1 (traditional coating) Example 1 (coating of the present application) Performance improvement (relative to Comparative Example 1) Taber abrasion weight loss ASTM D4060 mg 85.2 32.5 61.9% Salt spray test (after 1000 h) ASTM B117 (corrosion propagation) mm 3.8 0.5 86.8% Salt spray test (after 2000 h) ASTM B117 (corrosion propagation) mm 5.5 0.8 85.5% 5% H2SO4 soak (2000 h) Visual assessment (0-5, 5 being best) Grade 2 4 Significantly improved 5% NaOH immersion (2000 h) Visual assessment (0-5, 5 being best) Grade 3 5 Significantly improved Adhesion ISO 2409 (cross-cut method) Grade (0 being best) 2 0 100% (higher grade) Pencil hardness ASTM D3363 - 3H 6H Significantly improved Impact strength ASTM D2794 (positive impact) cm·kg 40 80 100% Flexibility GB / T 6742 (conical shaft bending) mm 16 8 50% (smaller bending path) Water absorption (7 days) ASTM D570 % 1.8 0.4 77.8% Self-repairing function Scratch healing and protective recovery - No Yes - Workability Low temperature / high humidity curing performance - Poor Excellent Significantly broadened

[0147] The test results are analyzed as follows:

[0148] From the above comparative data, it can be clearly seen that the wear-resistant and corrosion-resistant glass flake coating provided by the present application is significantly superior to the traditional glass flake coating in many key performance indicators.

[0149] First, in terms of wear resistance: the wear loss of the coating of Example 1 in the Taber abrasion test is only 32.5 mg, which is much lower than 85.2 mg of Comparative Example 1. This shows that by introducing nano-zirconium dioxide particles and functionalized graphene, the present application significantly improves the surface hardness and anti-wear ability of the coating. The high hardness of nano-zirconium dioxide gives the coating excellent anti-scratch and anti-abrasive wear ability, while the functionalized graphene effectively disperses stress and inhibits crack initiation and propagation through its two-dimensional structure and nano-enhancing effect, thereby improving the overall wear resistance of the coating.

[0150] Second, in terms of corrosion resistance: in the salt spray test, the corrosion expansion of the coating of Example 1 after 1000 hours and 2000 hours is only 0.5 mm and 0.8 mm respectively, which is much lower than 3.8 mm and 5.5 mm of Comparative Example 1, and the corrosion protection ability is improved by more than 85%. This fully reflects the synergistic effect brought by the surface modification of glass flake by multifunctional silane coupling agent, the nano-scale tortuous penetration path constructed by functionalized graphene, and the optimization of epoxy resin matrix and curing agent system in the present application, which greatly enhances the compactness of the coating and the barrier ability to corrosion medium. In the acid and alkali immersion test, the coating of Example 1 shows excellent chemical stability, and the visual evaluation grade is significantly higher than that of Comparative Example 1, especially the resistance to strong alkali reaches the highest level, which proves the excellent protective ability of the present application in complex chemical environment.

[0151] Third, in terms of mechanical properties: the coating of Example 1 shows excellent mechanical properties. Its adhesion reaches 0 level, which is much better than 2 level of Comparative Example 1, which is due to the stronger interfacial bonding between glass flake and resin matrix after silane coupling agent treatment, and the optimization of filler dispersion by wetting dispersant. The pencil hardness is improved from 3H of Comparative Example to 6H of Example, indicating that the surface hardness is greatly increased, making it more resistant to scratching. The impact strength is improved from 40 cm·kg to 80 cm·kg, and the flexibility (bending axis diameter) is reduced from 16 mm to 8 mm, which fully proves the significant contribution of toughening modified resin, functionalized graphene and self-repairing microcapsules in the present application to the toughness, impact resistance and crack resistance of the coating, so that the coating is not prone to brittle fracture when subjected to dynamic mechanical stress.

[0152] Fourthly, water absorption: the coating of Example 1 has a water absorption of only 0.4%, which is much lower than the 1.8% of Comparative Example 1. The lower water absorption directly reflects the higher compactness and lower free volume of the coating, which is important for improving the hydrolysis resistance and long-term corrosion protection performance of the coating. This is due to the optimized epoxy resin compounding system, the densification of functionalized graphene, and the close interface bonding between the components.

[0153] Fifthly, self-repairing function and construction adaptability: the coating of Example 1 clearly demonstrates the self-repairing function. After suffering micro-scratches, the internal self-repairing microcapsules can rupture and release the repair agent, effectively filling and healing the scratches, thereby restoring the integrity and corrosion protection barrier function of the coating. This is something that traditional coatings completely lack, greatly extending the service life of the coating in abrasive environments. In addition, due to the optimized design of the curing agent system, the coating of the present application can be reliably cured in a wider range of temperature (e.g. 5°C-40°C) and humidity (e.g. 30%-85%), significantly improving the construction adaptability of the coating and solving the pain point of the difficulty of construction of traditional coatings in low temperature or high humidity environments.

[0154] In summary, the present application provides a glass flake coating system that significantly improves abrasion resistance, corrosion resistance, mechanical properties, construction adaptability, and service life through the ingenious design and synergistic effect of the epoxy resin matrix, multi-scale reinforcing fillers, self-repairing microcapsules, and curing system. The present application does not simply stack various reinforcing components, but achieves significant improvement in comprehensive performance through the ingenious synergistic effect between the components, providing an innovative heavy-duty corrosion protection solution for dealing with complex and harsh industrial environments.

[0155] Example 2:

[0156] To further quantitatively verify the long-term protection performance of the coating of the present application in actual working conditions, a coating failure prediction mathematical model is constructed based on the material composition, performance test data, and construction process of Example 1, and the service life of the coating is evaluated through the model.

[0157] Based on the core technical features of multi-scale reinforcement, self-repairing, and thick coating protection of the coating in Example 1, considering the coupling effect of mechanical stress, environmental erosion, coating structure, and self-repairing compensation, the following service life prediction model is established:

[0158] Parameter Definition Relevance to Example 1 L Coating expected service life (unit: years) Core evaluation target, needs to be derived based on the performance data of Example 1 K Enhanced phase synergy factor (value 5-15) Directly related to the synergistic effect of the multi-scale reinforcing filler in Example 1: the dispersion effect and reinforcing effect of functionalized graphene (0.2%), nano-zirconium dioxide (1.0%), and surface-modified glass flake (20%), the enhanced phase synergy in Example 1 is significant, K=10 t Total coating thickness (unit: μm) In Example 1, the coating is coated in multiple layers, with a total thickness of 600 μm, increasing the coating thickness can prolong the penetration path of the corrosion medium, so the thickness correction is introduced σc Critical stress of coating (unit: MPa) Derived based on the mechanical property test of Example 1: the impact strength of the coating in Example 1 is 80 cm·kg, the pencil hardness is 6H, and the corresponding critical stress σc=50 MPa (representing the critical load of the coating to resist cracking) σa Actual working stress (unit: MPa) Corresponding to the application scenario of Example 1 (chemical equipment): the comprehensive stress generated by medium scouring and equipment vibration, the typical working condition in Example 1 is σa=30 MPa η Environmental erosion factor (value 0.3-1.0) Determined based on the corrosion resistance test of Example 1: the grade of 5% sulfuric acid immersion for 2000 h in Example 1 is 4, and the salt spray corrosion propagation is only 0.5 mm for 1000 h, corresponding to a medium corrosion environment, η=0.5 ε Wear strain rate (unit: % / year) Derived from the wear resistance test of Example 1: the Taber abrasion weight loss in Example 1 is 32.5 mg / 1000 revolutions, corresponding to the strain accumulation rate caused by wear, ε˙=0.2% / year C Self-repairing compensation coefficient (value 0.1-0.3) Directly related to the content of self-repairing microcapsules in Example 1: the proportion of self-repairing microcapsules in Example 1 is 3%, and the self-repairing function is verified, so C=0.1

[0159] Substitute the data in Example 1 into the formula:

[0160] Enhanced phase synergistic factor K = 10, based on the synergistic reinforcement of graphene, nano-zirconium dioxide, and glass flake in Example 1;

[0161] Total coating thickness t = 600 μm, actual application thickness in Example 1;

[0162] Critical stress σ c = 50 MPa, derived from impact strength 80 cm·kg in Example 1;

[0163] Actual working stress σ a = 30 MPa, typical working condition of chemical equipment;

[0164] Environmental erosion factor η = 0.5, based on salt spray / acid and alkali corrosion test results in Example 1;

[0165] Wear strain rate ε = 0.2% / year, derived from Taber abrasion data in Example 1;

[0166] Self-repairing compensation coefficient C = 0.1, based on 3% self-repairing microcapsule content in Example 1;

[0167] The calculation process is as follows:

[0168] ;

[0169] This embodiment reflects the protective gain effect of the coating through molecular terms, multi-scale reinforcing phase synergistic effect K, thick coating process t, stress safety margin , the denominator reflects the performance degradation factors, environmental erosion η, wear accumulation ε, and introduces a self-repairing compensation coefficient C to quantify the crack repair effect of microcapsules, achieving dynamic evaluation of the entire life cycle of the coating.

[0170] Model calculation shows that the coating prepared in Example 1 has an expected service life of 91.3 years under typical working conditions of chemical equipment, which is significantly better than the traditional glass flake coating, with a model calculation life of 22.8 years.

[0171] When the multi-scale reinforcing phase is removed (K = 5), the life is reduced to 45.6 years; when the self-repairing microcapsules are removed (C = 0), the life is reduced to 74.1 years; when the coating thickness is halved (t = 300 μm), the life is reduced to 45.6 years. The results confirm the synergistic effect of each technical feature on prolonging the service life.

[0172] The model calculation results provide a quantitative basis for the engineering application of the coating, indicating that the coating of the present application can meet the long-term protection needs of chemical equipment and has significant economic and safety value.

[0173] The mathematical model constructed in this embodiment can effectively evaluate the service life of the coating, and the calculation results confirm that the glass flake coating prepared in Example 1 has excellent long-term wear and corrosion resistance under complex working conditions, and the synergistic effect of each technical feature significantly improves the service life of the coating.

[0174] While the preferred embodiments of the application have been described, additional variations and modifications can be made to these embodiments by those skilled in the art once they have the benefit of the present disclosure. Therefore, the appended claims are intended to encompass all such variations and modifications as falling within the scope of the application.

[0175] The preferred embodiments of the application described hereinabove are therefore to be considered in all respects as illustrative only and not restrictive in character, since the scope of the application includes any modifications and variations that come within the scope of the appended claims.

Claims

1. A method for preparing a wear-resistant and corrosion-resistant glass flake coating, characterized in that: The coating comprises component A and component B, wherein component A comprises an epoxy resin matrix, a reinforcing filler, self-repairing microcapsules and an additive; the epoxy resin matrix is ​​compounded by at least two different types of epoxy resin components, the first epoxy resin component being a main resin and the second epoxy resin component being a toughening modified resin; the reinforcing filler comprises surface-modified glass flakes, functionalized graphene and nano-zirconium dioxide particles; the self-repairing microcapsules comprise a microcapsule wall and a self-repairing agent coated therein; the additive comprises a rheological additive, a defoaming agent and a wetting dispersant; and component B comprises a curing agent and a curing accelerator. The specific preparation method is as follows: Step 1: Surface functionalization of glass flakes: Dip or spray the glass flakes in a 0.5%–2.0% silane coupling agent aqueous solution for 10–30 min, and then dry at 100°C–120°C for 2–4 h. Step 2, functionalized nanofiller dispersion: functionalized graphene and nano zirconium dioxide particles are added to a portion of the first epoxy resin component, and high shear dispersion is performed at a speed of 1000 rpm to 3000 rpm using a planetary mixer or a sand mill for 1 to 3 hours; Step 3, mixing the main body of component A: add the remaining first epoxy resin component, second epoxy resin component, wetting dispersant and defoaming agent to the mixing container, stir at 500 rpm-1000 rpm for 30-60 minutes, and degas under vacuum at -0.08 MPa to -0.09 MPa; Step 4, mixing the reinforcing phase: add the surface functionalized glass flakes and self-healing microcapsules from step 1 to the mixture obtained in step 3, stir at a low speed of 100 rpm–300 rpm for 30–60 min, then add the rheological additive and continue stirring at 500 rpm–800 rpm for 30–60 min; Step 5, preparation of component B: stir and mix the curing agent and curing accelerator at 300 rpm–600 rpm for 10–20 min; Step 6, on-site construction mixing: Mix component A and component B according to a preset ratio, and stir at 500 rpm-800 rpm for 3-5 minutes. The preset ratio is a mass ratio of component A to component B of 4:

1.

2. The method for preparing a wear-resistant and corrosion-resistant glass flake coating according to claim 1, wherein: The silane coupling agent is a mixture of (3-glycidoxypropyl)trimethoxysilane and (3-aminopropyl)triethoxysilane; The glass flakes are C-type or ECR-type, with a thickness of 3 μm-5 μm, an average particle size D50 of 80 μm-120 μm, and an aspect ratio of 20-100.

3. The method for preparing a wear-resistant and corrosion-resistant glass flake coating according to claim 1, characterized in that: The first epoxy resin component has an epoxy equivalent weight of 180 g / eq–200 g / eq and a viscosity of 10 Pa·s–15 Pa·s at 25°C; The second epoxy resin component has an epoxy equivalent weight of 250 g / eq–350 g / eq and a viscosity of 30 Pa·s–50 Pa·s at 25°C; The mass ratio of the first epoxy resin component to the second epoxy resin component is 100:10-100:

30.

4. The method for preparing a wear-resistant and corrosion-resistant glass flake coating according to claim 1, characterized in that: The functionalized graphene is graphene oxide or reduced graphene oxide, with a lateral size of 1 μm–5 μm and a thickness of less than 5 nm, and epoxy groups, hydroxyl groups or amino functional groups grafted onto the surface; The nano zirconium dioxide particles are spherical or quasi-spherical, with an average particle size of 20nm-50nm, and the surface is treated with a silane coupling agent; Functionalized graphene accounts for 0.1%–0.5% of the total mass of the coating, and nano-zirconium dioxide accounts for 0.5%–2.0%.

5. The method for preparing a wear-resistant and corrosion-resistant glass flake coating according to claim 1, characterized in that: The wall material of the self-repairing microcapsule is polyurea-formaldehyde or poly (melamine-formaldehyde) resin, with an average diameter of 50 μm-200 μm and a wall thickness of 1 μm-5 μm.

6. An application of the wear-resistant and corrosion-resistant glass flake coating prepared by the preparation method of the wear-resistant and corrosion-resistant glass flake coating according to any one of claims 1 to 5, characterized in that: include: Step 101, substrate pretreatment: sandblasting or shot blasting the metal substrate to Sa2.5 level, roughness Rz40μm-70μm; Step 102, coating application: applying the coating prepared by the method of claims 1-5 to a substrate in a single layer thickness of 200 μm-500 μm, and applying multiple layers with a recoating interval of 6 hours-24 hours; Step 103 , coating curing: curing at 5°C–40°C and 30%–85% relative humidity, with a surface drying time of 6–8 hours, a thorough drying time of 24–48 hours, and a complete curing time of 7 days.

7. The use of the wear-resistant and corrosion-resistant glass flake coating according to claim 6, characterized in that: In step 101, the metal substrate is carbon steel, stainless steel or alloy steel, and the concrete substrate needs to be cleaned of dust and subjected to pH neutralization treatment to make the pH value of the surface of the concrete substrate reach 7-10.

8. The use of the wear-resistant and corrosion-resistant glass flake coating according to claim 6, characterized in that: In step 102, the coating method is air-assisted spraying, airless spraying, roller coating or brushing. When the total coating thickness is ≥800 μm, it is coated in at least two layers. The coating method can be the same or different, and the interval between the two adjacent layers is 6h-24h.

9. The use of the wear-resistant and corrosion-resistant glass flake coating according to claim 6, characterized in that: In step 103, when the ambient temperature is lower than 10°C in the curing conditions, a low-temperature curing accelerator is used to accelerate the reaction. The low-temperature curing accelerator is tris(dimethylaminomethyl)phenol or a urea derivative.

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