Environment-friendly high-solid-content anticorrosive paint and preparation method thereof

Abstract

The invention belongs to the technical field of anti-corrosion coatings, and particularly relates to an environment-friendly high-solid-content anti-corrosion coating and a preparation method thereof.The anti-corrosion coating is prepared from high-corrosion-resistance resin, anti-corrosion anti-seepage filler, calcium ion modified silicon dioxide, zinc molybdate, scale filler, an active diluent and a curing agent. Through the innovative formula design, the solid content reaches 90% or above, emission of volatile organic compounds is greatly reduced, the fire risk and solvent poisoning hidden danger in the construction process are reduced, and the construction safety under the poor ventilation environment is improved; calcium ion modified silicon dioxide and other novel environment-friendly auxiliaries replace traditional toxic anti-rust pigments, and harm to the environment and the human body is reduced. The salt spray resistance test is more than or equal to 12 years; high stability performance is achieved in acid, alkali, salt and solvent media; and the coating is free of powdering, cracking or peeling after an artificial accelerated aging test is carried out for more than or equal to 4000 hours.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of anticorrosive paint, and particularly relates to an environment-friendly high-solid-content anticorrosive paint and a preparation method thereof. BACKGROUND

[0002] Traditional anticorrosive paint has problems of high solvent content (60% to 70%), serious pollution, insufficient corrosion resistance and the like. With the increasingly stringent environmental protection policy and the upgrading of industry demand, it is urgent to develop paint with high solid content, environmental protection, long-term corrosion resistance. In the prior art, low solid content paint needs frequent recoating, and has low construction efficiency; and high solid content paint often has poor adhesion or insufficient chemical permeability due to unreasonable component ratio. SUMMARY

[0003] The application aims to provide an environment-friendly high-solid-content anticorrosive paint and a preparation method thereof, and solve the technical problems of high solvent content, poor environmental protection, insufficient corrosion resistance and weak construction adaptability of the existing anticorrosive paint.

[0004] The application provides an environment-friendly high-solid-content anticorrosive paint in the first aspect, which comprises the following components in parts by weight: high corrosion-resistant resin 30 to 50 parts, corrosion-resistant and impermeable filler 10 to 20 parts, calcium ion modified silicon dioxide 5 to 10 parts, zinc molybdate 1 to 5 parts, flake filler 5 to 15 parts, active diluent 5 to 20 parts, and curing agent 0.1 to 5 parts; The high corrosion-resistant resin comprises at least one of phenolic epoxy resin, fluorinated epoxy resin, polyurethane resin, vinyl resin, fluorocarbon resin and siloxane resin. The corrosion-resistant and impermeable filler comprises at least one of mica iron oxide, glass flake, talc powder, silicon powder, titanium white powder and molybdenum modified zinc phosphate.

[0005] Optionally, the environment-friendly high-solid-content anticorrosive paint comprises the following components in parts by weight: high corrosion-resistant resin 35 to 40 parts, corrosion-resistant and impermeable filler 15 to 20 parts, calcium ion modified silicon dioxide 8 to 10 parts, zinc molybdate 3 to 5 parts, flake filler 10 to 13 parts, active diluent 6 to 8 parts, and curing agent 1 to 3 parts; the mass ratio of the corrosion-resistant and impermeable filler to the calcium ion modified silicon dioxide is 2:1 to 1.5. The high corrosion-resistant resin comprises bisphenol A type phenolic epoxy resin. The corrosion-resistant and impermeable filler comprises mica iron oxide. The flake filler comprises graphite flake.

[0006] Optionally, the preparation method of the calcium ion modified silicon dioxide comprises the following steps: Dispersing silicon dioxide in water to form a suspension; adding a calcium compound solution under stirring conditions, then adjusting the pH value to be acidic, heating and continuously stirring for not less than 3 hours; then filtering, washing, and drying to obtain calcium ion modified silicon dioxide.

[0007] Optionally, the calcium compound includes at least one of calcium chloride and calcium nitrate.

[0008] Optionally, in the preparation method of the calcium ion-modified silica, the pH value is adjusted to 2-6 and the temperature is heated to 60° C.-80° C.

[0009] Optionally, the reactive diluent includes at least one of 1,4-butanediol diglycidyl ether, neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether and propylene oxide butyl ether.

[0010] Optionally, the curing agent includes at least one of aliphatic amine, aromatic amine and polyamide.

[0011] Optionally, the curing agent is polyamide curing agent Versamid 115 or polyamide 650 curing agent.

[0012] A second aspect of the present application provides a method for preparing an environmentally friendly high-solid content anti-corrosion coating, comprising the following steps: The raw materials are calculated by weight, and 10-20 parts of corrosion-resistant and anti-seepage filler, 5-10 parts of calcium ion-modified silica, 1-5 parts of zinc molybdate and 5-15 parts of flake filler are ball-milled in 5-20 parts of active diluent, and then added into a mixed liquid of 30-50 parts of high-corrosion-resistant resin and 0.1-5 parts of curing agent, and stirred and dispersed to obtain an environmentally friendly high-solid content anti-corrosion coating with a solid content of ≥90%.

[0013] Optionally, the corrosion-resistant and anti-permeability filler, calcium ion-modified silica, zinc molybdate and flake filler are ball-milled to powder with an average particle size of 20 to 30 μm.

[0014] The beneficial effects of this application are: The environmentally friendly high-solid content anti-corrosion coating provided in the first aspect of the present application achieves excellent anti-corrosion performance through the synergistic effect of multiple components, wherein the flake filler forms a "maze effect" in the coating, and the interlaced flake structure prolongs the penetration path of the corrosive medium (water, oxygen, chloride ions, etc.), significantly reducing the penetration rate; the corrosion-resistant and anti-permeation filler further improves the density of the coating by filling the pores of the resin matrix, and blocks the contact between the corrosive medium and the substrate; zinc molybdate and molybdenum-modified zinc phosphate generate zinc hydroxide and phosphate ions through hydrolysis, which are deposited on the metal surface to form a phosphating or passivation film, thereby inhibiting anodic corrosion; calcium ion-modified silica intercepts corrosive ions (such as Cl ions) through an ion exchange mechanism. - 、SO4 2- ), release of Ca2+ In combination with the corrosion product, an inorganic isolation layer is formed on the surface of the substrate to block the corrosion reaction; the high corrosion-resistant resin reacts with the active diluent and the curing agent to form a crosslinked network structure, thereby enhancing the mechanical strength and weather resistance of the coating; the active diluent not only reduces the viscosity of the system, but also participates in the curing reaction, thereby avoiding resource waste and environmental pollution caused by volatilization of traditional solvents.

[0015] The preparation method of the environmentally friendly high solid content anticorrosive coating provided in the second aspect of the application comprises the following steps: ball milling corrosion-resistant and impermeable fillers, calcium ion modified silicon dioxide, zinc molybate and flaky fillers in an active diluent; the ball milling treatment refines the filler particles and breaks the agglomeration state of the filler particles through mechanical force, thereby ensuring uniform dispersion of the filler in the system, forming a “labyrinth effect” and a physical barrier, and significantly reducing the penetration rate of the corrosion medium; the active diluent not only reduces the viscosity of the system, but also participates in the subsequent curing reaction, thereby avoiding resource waste and environmental pollution caused by volatilization of traditional solvents; the high corrosion-resistant resin and the curing agent (pre-mixed to form a base system with reactivity) jointly determine the mechanical properties and corrosion resistance of the final coating through crosslinking reaction of the molecular chain structure of the resin and the curing agent; the pre-mixed filler slurry is slowly added to the resin-curing agent mixture, and the filler is further dispersed through high-speed stirring, thereby ensuring that the filler is fully combined with the resin matrix to form a dense coating film structure; the active diluent is used to replace the traditional solvent, and the amount of the filler is controlled, so that the solid content is ≥ 90%. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects of the application clearer, the application will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0017] In the first aspect, the application provides an environmentally friendly high solid content anticorrosive coating, which comprises the following components by weight: high corrosion-resistant resin 30-50 parts, corrosion-resistant and impermeable filler 10-20 parts, calcium ion modified silicon dioxide 5-10 parts, zinc molybdate 1-5 parts, flaky filler 5-15 parts, active diluent 5-10 parts, and curing agent 0.1-5 parts; The high corrosion-resistant resin comprises at least one of phenolic epoxy resin, fluorinated epoxy resin, polyurethane resin, vinyl resin, fluorocarbon resin and siloxane resin. The corrosion-resistant and impermeable filler comprises at least one of mica iron oxide, glass flake, talc powder, silicon powder, titanium white powder and molybdenum modified zinc phosphate.

[0018] The environmentally friendly high-solid content anti-corrosion coating provided in the first aspect of the present application achieves excellent anti-corrosion performance through the synergistic effect of multiple components, wherein the flake filler forms a "maze effect" in the coating, and the interlaced flake structure prolongs the penetration path of the corrosive medium (water, oxygen, chloride ions, etc.), significantly reducing the penetration rate; the corrosion-resistant and anti-permeation filler further improves the density of the coating by filling the pores of the resin matrix, and blocks the contact between the corrosive medium and the substrate; zinc molybdate and molybdenum-modified zinc phosphate generate zinc hydroxide and phosphate ions through hydrolysis, which are deposited on the metal surface to form a phosphating or passivation film, thereby inhibiting anodic corrosion; calcium ion-modified silica intercepts corrosive ions (such as Cl ions) through an ion exchange mechanism. - 、SO4 2- ), release of Ca 2+ It combines with corrosion products to form an inorganic isolation layer on the surface of the substrate, blocking the corrosion reaction; the high corrosion-resistant resin reacts with the active diluent and curing agent to form a cross-linked network structure, enhancing the mechanical strength and weather resistance of the coating; the active diluent not only reduces the viscosity of the system, but also participates in the curing reaction, avoiding the waste of resources and environmental pollution caused by the volatilization of traditional solvents.

[0019] This application utilizes an innovative formula design, boasting a solids content exceeding 90%, significantly reducing volatile organic compound (VOC) emissions, lowering fire risks and solvent poisoning during construction, and improving construction safety in poorly ventilated environments. The formula contains no heavy metals (such as chromium and lead), and uses new environmentally friendly additives such as calcium-modified silica to replace traditional toxic anti-rust pigments (such as red lead), minimizing harm to the environment and health. The coating demonstrates salt spray resistance for ≥12 years and accelerated aging for ≥4000 hours, with no powdering, cracking, or flaking. Furthermore, it exhibits excellent application adaptability, with a surface dry time of just 15 minutes and a full dry time of 2 hours at ambient temperatures ≥20°C and relative humidity ≤85%. This allows for optimal application in harsh conditions such as high temperature and humidity, reducing the number of coats and application cycles, and improving project efficiency. Furthermore, it reduces solvent usage and energy consumption, while fillers such as calcium-modified silica provide long-lasting corrosion inhibition, reducing the need for recoating.

[0020] In one possible implementation, the environmentally friendly high-solid content anti-corrosion coating is characterized by comprising the following components in parts by weight: 35-40 parts of high corrosion-resistant resin, 15-20 parts of corrosion-resistant and anti-seepage filler, 8-10 parts of calcium ion-modified silica, 3-5 parts of zinc molybdate, 10-13 parts of flake filler, 6-8 parts of active diluent, and 1-3 parts of curing agent; The highly corrosion-resistant resin includes bisphenol A novolac epoxy resin; The corrosion-resistant and anti-seepage filler comprises mica iron oxide; The flake filler includes graphite flakes.

[0021] The environmental protection type high solid content anticorrosive coating provided by the application realizes excellent corrosion resistance through the synergistic effect of multiple components. In the coating, graphite scales form a "labyrinth effect", the penetration path of corrosion medium (water, oxygen, chloride ions, etc.) is prolonged through the interlaced sheet structure, and the penetration rate is significantly reduced. Mica iron oxide fills the pores of the resin matrix to further improve the compactness of the coating and block the contact of corrosion medium and the substrate. Zinc molybdate and molybdenum modified zinc phosphate generate zinc hydroxide and phosphate ions through hydrolysis and deposit on the metal surface to form a phosphating or passivation film to inhibit anodic corrosion. Calcium ion modified silicon dioxide intercepts corrosive ions (such as Cl - , SO4 2- ) through an ion exchange mechanism, releases Ca 2+ , and combines with corrosion products to form an inorganic isolation layer on the substrate surface to block the corrosion reaction. Bisphenol A type phenolic epoxy resin reacts with active diluent and curing agent to form a crosslinked network structure to enhance the mechanical strength and weather resistance of the coating. The active diluent not only reduces the viscosity of the system, but also participates in the curing reaction to avoid resource waste and environmental pollution caused by traditional solvent volatilization.

[0022] Through innovative formula design, the solid content of the application is as high as 90 parts or more, which greatly reduces the emission of volatile organic compounds (VOC), reduces the fire risk and solvent poisoning hidden danger in the construction process, and improves the safety of construction in poor ventilation environment. The salt spray resistance test is ≥15 years; the artificial accelerated aging test is ≥5000 hours, and the coating has no powdering, cracking or peeling.

[0023] In one possible implementation, the preparation method of calcium ion modified silicon dioxide includes the following steps: Disperse silicon dioxide in water to form a suspension; add a calcium compound solution under stirring, then adjust the pH value to be acidic, heat and continuously stir for not less than 3 hours; then filter, wash and dry to obtain calcium ion modified silicon dioxide.

[0024] The surface of silicon dioxide is rich in silicon hydroxyl groups (Si-OH), which are protonated (Si-OH2 + ) in an acidic environment (pH<7) to enhance the electrostatic attraction with calcium ions (Ca 2+ ). The calcium ions replace H + in the hydroxyl group through ion exchange to form a Si-O-Ca + surface structure; part of the calcium ions further combine with adjacent hydroxyl groups to form a bridged structure Si-O-Ca-O-Si to improve the binding stability; heating (usually 60~80℃) accelerates ion diffusion; ≥3 hours of stirring ensures uniform bonding of calcium ions and avoids local aggregation. The calcium ion modified silicon dioxide enables Ca 2+Ion exchange with silica gel, thus chemically adsorbed on silica gel. When the corrosive electrolyte enters the coating film, it will contact the calcium ion exchange silica gel, intercept the corrosive ion on the surface of the silica gel, and replace the calcium ion adsorbed on the surface of the silica gel, release the anti-rust ion to the metal substrate surface to form an inorganic layer, play a barrier role to protect the substrate.

[0025] The second aspect of the application provides a preparation method of an environmentally friendly high solid content anticorrosive coating, comprising the following steps: The raw materials are mixed by ball milling in the active diluent 5~20 parts, and then the mixed liquid of high corrosion resistant resin 30~50 parts and curing agent 0.1~5 parts is added and stirred and dispersed to obtain the environmentally friendly high solid content anticorrosive coating, and the solid content is ≥90%.

[0026] The preparation method of the environmentally friendly high solid content anticorrosive coating provided by the second aspect of the application mixes the corrosion resistant and impermeable filler, calcium ion modified silicon dioxide, zinc molybdate and flaky filler in the active diluent by ball milling; the ball milling treatment refines the filler particles and breaks their agglomeration state through mechanical force, ensures uniform dispersion of the filler in the system, forms a "labyrinth effect" and a physical barrier, and significantly reduces the penetration rate of the corrosion medium; the active diluent not only reduces the viscosity of the system, but also participates in the subsequent curing reaction, avoiding resource waste and environmental pollution caused by volatilization of traditional solvents; the high corrosion resistant resin and the curing agent (pre-mixed, forming a reactive matrix system, the molecular chain structure of the resin and the crosslinking reaction ability of the curing agent together determine the mechanical properties and corrosion resistance of the final coating; the pre-mixed filler slurry is slowly added to the resin-curing agent mixture, and the filler is further dispersed by high-speed stirring to ensure that the filler is fully combined with the resin matrix to form a dense coating structure; the active diluent is used to replace the traditional solvent, and the filler amount is controlled to make the solid content ≥90%.

[0027] The preparation method has the following advantages: Excellent corrosion resistance: the "labyrinth effect" of the filler and the ion exchange mechanism of the calcium ion modified silicon dioxide synergistically extend the penetration path of the corrosion medium, and form an inorganic isolation layer by releasing Ca²⁺, significantly improving the salt spray resistance (≥12 years) and artificial aging resistance (≥4000 hours). The corrosion inhibition effect of zinc molybdate and molybdenum modified zinc phosphate is further passivated by hydrolysis to generate zinc hydroxide and phosphate ions.

[0028] High density and adhesion: ball milling treatment refines and uniformly disperses the filler particles, reduces the porosity of the coating, and enhances the density of the coating. The interfacial bonding force between the resin and the filler is improved, and the adhesion reaches 0 level (cross-hatch method test), ensuring long-term stability of the coating.

[0029] Environmental protection and economy: The use of solvents is greatly reduced by solid content ≥ 90%, and VOC emissions are greatly reduced compared to traditional coatings; reduce the risk of fire and solvent poisoning during construction, improve the safety of construction in poor ventilation environment. High solid content reduces the amount of paint used, reduces material costs, and the long-term corrosion inhibition of fillers reduces the frequency of touch-up and reduces maintenance costs.

[0030] Strong construction adaptability: when the ambient temperature is ≥ 20℃ and the relative humidity is ≤ 85%, the surface drying time is only 15 minutes and the real drying time is 2 hours, which can adapt to harsh conditions such as high temperature and high humidity, reduce the number of painting and construction period, and improve the engineering efficiency.

[0031] Simplify the production process: One-step process of ball milling-mixing-dispersion reduces process complexity, reduces energy consumption and equipment cost, and the rapid reaction characteristics of active diluent and curing agent shorten the curing time and improve the production efficiency.

[0032] In one possible implementation, the corrosion-resistant and impermeable filler, calcium ion modified silicon dioxide, zinc molybdate and flaky filler are ball milled to a powder with an average particle size of 20-30 μm.

[0033] The filler particles are refined to 20-30 μm by mechanical force (such as impact and shear action of grinding medium), which breaks the original agglomeration state of the particles, reduces the voids and interface defects between the particles, and controls the particle size in the range of 20-30 μm, which can ensure uniform dispersion of the filler in the resin matrix, and can avoid the problem of rapid increase of system viscosity caused by too fine particles (<10 μm) or uneven dispersion caused by too coarse particles (>50 μm). After ball milling, the particle size of the filler is uniform, the surface energy is reduced, the wettability with active diluent and resin matrix is enhanced, the risk of filler settlement or floating is reduced, and the stability of the mixed solution is ensured. Ball milling treatment increases the specific surface area of calcium ion modified silicon dioxide, increases the surface active sites, and increases the contact area with corrosive ions (such as Cl - , SO4 2- ), which improves the ion exchange efficiency. When corrosive electrolyte enters the coating film, calcium ions are quickly released and react with the metal surface to form an inorganic barrier layer (such as CaCO3, CaSO4), which blocks the corrosion reaction; zinc molybdate has uniform particle size after ball milling, and the hydrolysis products (such as Zn(OH)2, MoO4 2- ) are more easily diffused to the metal surface to form phosphating film or passivation film to inhibit anodic corrosion. By ball milling the filler to a particle size range of 20-30 μm, the present scheme realizes synergistic optimization in physical barrier, chemical corrosion inhibition and construction adaptability, and solves the problems of uneven dispersion of traditional anticorrosive coating fillers, poor environmental protection, and complex construction. Its technical indicators (such as salt spray resistance ≥ 12 years, artificial aging ≥ 4000 hours) are far superior to the average level of the industry.

[0034] Preparation of calcium ion modified silicon dioxide: Silica was dispersed in water to form a suspension; under stirring, a calcium chloride solution was added, the mass ratio of silica to calcium chloride was 1:1, then the pH value was adjusted to 5, heated to 60℃ and continuously stirred for 3h; then filtered, washed, dried to obtain calcium ion modified silica.

[0035] Example 1 Preparation of the environment-friendly high solid content anticorrosive coating: The raw materials, mica iron oxide 20 parts, calcium ion modified silica 5 parts, zinc molybdate 3 parts and graphite flake 10 parts, were ball-milled in 1,4-butanediol diglycidyl ether 20 parts, then added into the mixed solution of bisphenol A type phenolic epoxy resin 40 parts and polyamide 650 2 parts for stirring and dispersing to obtain the environment-friendly high solid content anticorrosive coating.

[0036] Example 2 Preparation of the environment-friendly high solid content anticorrosive coating: The raw materials, mica iron oxide 20 parts, calcium ion modified silica 8 parts, zinc molybdate 3 parts and graphite flake 10 parts, were ball-milled in 1,4-butanediol diglycidyl ether 20 parts, then added into the mixed solution of bisphenol A type phenolic epoxy resin 40 parts and polyamide 650 2 parts for stirring and dispersing to obtain the environment-friendly high solid content anticorrosive coating.

[0037] Example 3 The raw materials, mica iron oxide 20 parts, calcium ion modified silica 10 parts, zinc molybdate 3 parts and graphite flake 10 parts, were ball-milled in 1,4-butanediol diglycidyl ether 20 parts, then added into the mixed solution of bisphenol A type phenolic epoxy resin 40 parts and polyamide 650 2 parts for stirring and dispersing to obtain the environment-friendly high solid content anticorrosive coating.

[0038] Example 4 The raw materials, mica iron oxide 16 parts, calcium ion modified silica 10 parts, zinc molybdate 3 parts and graphite flake 10 parts, were ball-milled in 1,4-butanediol diglycidyl ether 20 parts, then added into the mixed solution of bisphenol A type phenolic epoxy resin 40 parts and polyamide 650 2 parts for stirring and dispersing to obtain the environment-friendly high solid content anticorrosive coating.

[0039] Example 5 The raw materials, mica iron oxide 16 parts, calcium ion modified silica 10 parts, zinc molybdate 3 parts and graphite flake 10 parts, were ball-milled in 1,4-butanediol diglycidyl ether 20 parts, then added into the mixed solution of bisphenol A type phenolic epoxy resin 40 parts and polyamide curing agent Versamid 115 2 parts for stirring and dispersing to obtain the environment-friendly high solid content anticorrosive coating.

[0040] Example 6 Preparation of environment-friendly high solid content anticorrosive paint: The raw materials, mica iron oxide 5 parts, glass flake 7 parts, silicon powder 8 parts, calcium ion modified silicon dioxide 5 parts, zinc molybdate 3 parts and graphite flake 10 parts, were ball-milled in neopentyl glycol diglycidyl ether 20 parts, then added into a mixed solution of polyurethane resin 40 parts and polyamide 650 2 parts for stirring and dispersing, to obtain the environment-friendly high solid content anticorrosive paint.

[0041] Comparative Example 1 The raw materials, mica iron oxide 16 parts, zinc molybdate 3 parts and graphite flake 10 parts, were ball-milled in 1,4-butanediol diglycidyl ether 20 parts, then added into a mixed solution of bisphenol A type phenolic epoxy resin 40 parts and polyamide curing agent Versamid 115 2 parts for stirring and dispersing, to obtain the environment-friendly high solid content anticorrosive paint.

[0042] Comparative Example 2 The raw materials, mica iron oxide 16 parts, silicon dioxide 10 parts, zinc molybdate 3 parts and graphite flake 10 parts, were ball-milled in 1,4-butanediol diglycidyl ether 20 parts, then added into a mixed solution of bisphenol A type phenolic epoxy resin 40 parts and polyamide curing agent Versamid 115 2 parts for stirring and dispersing, to obtain the environment-friendly high solid content anticorrosive paint.

[0043] The products obtained in the above examples and comparative examples were tested for performance: Construction conditions: ambient temperature ≥ 20℃, relative humidity ≤ 85%, surface dryness 15 min, and real dryness 2 h.

[0044] Test method: adhesion GB / T 9286-1998; salt spray resistance GB / T 1771-2007; artificial accelerated aging GB / T 1865-2009; solid content determined by oven method; acid and alkali resistance 5% H2SO4 / NaOH immersion for 30 days.

[0045] Performance index see Table 1 Table 1

[0046] It should be understood by those skilled in the art that the above discussion of any of the embodiments is merely exemplary and is not intended to suggest any limitation as to the scope of protection; under the idea of the present application, the technical features of the above examples or different examples can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

[0047] It is intended that the embodiments of the application herein disclosed meet all the written requirements of the patent statutes and come within the judicial doctrines of equivalents and will not be construed to be limited to the embodiments shown and described and by the keeping within the spirit and scope of the embodiments of the application.

Claims

1. An environmentally friendly high solid content anti-corrosion coating, characterized in that: The composition comprises the following components in parts by weight: 30-50 parts of high corrosion-resistant resin, 10-20 parts of corrosion-resistant and anti-seepage filler, 5-10 parts of calcium ion-modified silica, 1-5 parts of zinc molybdate, 5-15 parts of flake filler, 5-20 parts of active diluent, and 0.1-5 parts of curing agent; The highly corrosion-resistant resin comprises at least one of a phenolic epoxy resin, a fluorinated epoxy resin, a polyurethane resin, a vinyl resin, a fluorocarbon resin, and a silicone resin; The corrosion-resistant and anti-seepage filler includes at least one of mica iron oxide, glass flakes, talc powder, silicon powder, titanium dioxide and molybdenum-modified zinc phosphate.

2. The environmentally friendly high solid content anti-corrosion coating according to claim 1, characterized in that: The composition comprises the following components in parts by weight: 35-40 parts of high-corrosion-resistant resin, 15-20 parts of corrosion-resistant and anti-seepage filler, 8-10 parts of calcium ion-modified silica, 3-5 parts of zinc molybdate, 10-13 parts of flake filler, 6-8 parts of reactive diluent, and 1-3 parts of curing agent; the mass ratio of corrosion-resistant and anti-seepage filler to calcium ion-modified silica is 2:1-1.5; The highly corrosion-resistant resin includes bisphenol A novolac epoxy resin; The corrosion-resistant and anti-seepage filler comprises mica iron oxide; The flake filler includes graphite flakes.

3. The environmentally friendly high solid content anti-corrosion coating according to claim 1, characterized in that: The preparation method of the calcium ion modified silica comprises the following steps: Dispersing silicon dioxide in water to form a suspension; adding a calcium compound solution under stirring conditions, then adjusting the pH value to be acidic, heating and continuously stirring for not less than 3 hours; then filtering, washing, and drying to obtain calcium ion modified silicon dioxide.

4. The environmentally friendly high solid content anti-corrosion coating according to claim 3, characterized in that: The calcium compound includes at least one of calcium chloride and calcium nitrate.

5. The environmentally friendly high solid content anti-corrosion coating according to claim 4, characterized in that: In the preparation method of the calcium ion modified silica, the pH value is adjusted to 2-6 and the temperature is heated to 60° C.-80° C.

6. The environmentally friendly high solid content anti-corrosion coating according to any one of claims 1 to 5, characterized in that: The reactive diluent includes at least one of 1,4-butanediol diglycidyl ether, neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether and propylene oxide butyl ether.

7. The environmentally friendly high solid content anti-corrosion coating according to any one of claims 1 to 5, characterized in that: The curing agent includes at least one of aliphatic amine, aromatic amine and polyamide.

8. The environmentally friendly high-solid content anti-corrosion coating according to any one of claims 1 to 5, characterized in that: The curing agent is polyamide curing agent Versamid 115 or polyamide 650 curing agent.

9. A method for preparing an environmentally friendly high-solid content anti-corrosion coating, characterized in that: The following steps are involved: The raw materials are calculated by weight, and 10-20 parts of corrosion-resistant and anti-seepage filler, 5-10 parts of calcium ion-modified silica, 1-5 parts of zinc molybdate and 5-15 parts of flake filler are ball-milled in 5-20 parts of active diluent, and then added into a mixed liquid of 30-50 parts of high-corrosion-resistant resin and 0.1-5 parts of curing agent, and stirred and dispersed to obtain an environmentally friendly high-solid content anti-corrosion coating with a solid content of ≥90%.

10. The preparation method according to claim 9, characterized in that The corrosion-resistant and anti-permeability filler, calcium ion-modified silicon dioxide, zinc molybdate and flake filler are ball-milled to powder with an average particle size of 20 to 30 μm.

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