CN117070090A - Anti-corrosion coating system based on Mxene - Google Patents

Anti-corrosion coating system based on Mxene Download PDF

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Publication number
CN117070090A
CN117070090A CN202310970947.4A CN202310970947A CN117070090A CN 117070090 A CN117070090 A CN 117070090A CN 202310970947 A CN202310970947 A CN 202310970947A CN 117070090 A CN117070090 A CN 117070090A
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China
Prior art keywords
parts
coating
mxene
epoxy
paint
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Pending
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CN202310970947.4A
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Chinese (zh)
Inventor
徐慰玉
李桐
汪培庆
李辉龙
唐学维
汪国庆
胡小珍
高波
梁辉
黄勇
王磊
陈潜
张立涛
范海峰
张胤
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Sichuan Xuanyang New Material Technology Co ltd
Hainan University
China Railway Hi Tech Industry Corp Ltd
China Railway Jiujiang Bridge Engineering Co Ltd
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Sichuan Xuanyang New Material Technology Co ltd
Hainan University
China Railway Hi Tech Industry Corp Ltd
China Railway Jiujiang Bridge Engineering Co Ltd
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Application filed by Sichuan Xuanyang New Material Technology Co ltd, Hainan University, China Railway Hi Tech Industry Corp Ltd, China Railway Jiujiang Bridge Engineering Co Ltd filed Critical Sichuan Xuanyang New Material Technology Co ltd
Priority to CN202310970947.4A priority Critical patent/CN117070090A/en
Publication of CN117070090A publication Critical patent/CN117070090A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C09D5/10—Anti-corrosive paints containing metal dust
    • C09D5/106—Anti-corrosive paints containing metal dust containing Zn
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C09D127/18—Homopolymers or copolymers of tetrafluoroethene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2265—Oxides; Hydroxides of metals of iron
    • C08K2003/2272—Ferric oxide (Fe2O3)
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
    • C08K2003/3045—Sulfates

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention relates to the technical field of corrosion protection, in particular to an anti-corrosion coating system based on Mxene; the coating system comprises an Mxene modified water-based inorganic zinc-rich primer layer, an epoxy sealing paint coating, an epoxy cloud iron intermediate paint coating and a fluorocarbon finish paint coating. In the coating system, the Mxene modified water-based inorganic zinc-rich primer layer, the epoxy sealing paint coating, the epoxy cloud iron intermediate paint coating and the fluorocarbon finish paint coating are matched with each other, so that the comprehensive protection of a bridge steel structure can be provided, the problems of corrosion, abrasion, oxidization and the like are prevented, and the service life of a bridge is prolonged.

Description

Anti-corrosion coating system based on Mxene
Technical Field
The invention relates to the technical field of corrosion protection, in particular to an anti-corrosion coating system based on Mxene.
Background
At present, organic solvents containing VOCs (volatile organic compounds) are commonly used for corrosion protection treatment in bridge engineering, but have a great influence on the environment and human health. The most commonly used anti-slip anti-corrosion coating at present is an inorganic zinc-rich anti-corrosion coating. In recent years, with the enhancement of environmental awareness, the use of inorganic zinc-rich paint is limited to a certain extent. The water-based inorganic zinc-rich paint has low VOCs content and excellent corrosion resistance, wear resistance, adhesion and other aspects, so that the water-based inorganic zinc-rich paint has been widely used. The water-based inorganic zinc-rich paint is generally used as a primer layer in an anti-corrosion coating system of a bridge structure, and the existing water-based inorganic zinc-rich paint still has the following problems: harmful substances in the inorganic zinc-rich aqueous solution paint can be released into the air, and the content of VOCs is high, so that air pollution is caused, and the harmful effects on the respiratory system of a human body are generated; the inorganic zinc-rich aqueous solution paint is easy to fall off, peel off, rust and the like when exposed to the external environment for a long time, so that the weather resistance of the coating is poor, and frequent maintenance and repair are required. In addition, the corrosion resistance of the existing corrosion-resistant coating systems needs to be further improved.
Disclosure of Invention
The technical problem solved by the invention is at least one of the following problems: the inorganic zinc-rich aqueous solution paint has higher VOCs content and is easy to cause air pollution; the weather resistance of the inorganic zinc-rich aqueous solution paint coating is poor, and frequent maintenance and repair are needed; the corrosion resistance of the existing corrosion-resistant coating system needs to be further improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
an anti-corrosion coating system based on Mxene comprises an Mxene modified water-based inorganic zinc-rich primer layer, an epoxy sealing paint coating, an epoxy cloud iron intermediate paint coating and a fluorocarbon finish paint coating; the Mxene modified water-based inorganic zinc-rich primer layer comprises the following components in parts by weight: 0.5-3 parts of flaky MXanee, 19-21 parts of ethyl orthosilicate, 2-4 parts of water, 6-8 parts of propylene glycol methyl ether, 1.5-2.5 parts of alumina, 5-7 parts of phosphorus iron powder, 1.5-2.5 parts of titanium oxide, 0.8-1.2 parts of silicon carbide, 2-4 parts of cloud iron powder, 1.5-2.5 parts of boron nitride, 1.5-2.5 parts of polyvinyl butyral, 0.2-1 part of rare earth chelate, 62.5-67.8 parts of zinc powder, 0.4-0.6 part of zinc chloride, 0.4-0.6 part of stannous chloride and 0.8-1.2 parts of silver nitrate.
Optionally, the preparation method of the flaky Mxene comprises the following steps:
step A1, adding carbon titanium aluminum into a mixed solution composed of lithium fluoride and hydrochloric acid, stirring and reacting for 24-48 hours at 30-50 ℃, and collecting a precipitation product;
and A2, adding water into the precipitate, and carrying out ultrasonic treatment, centrifugation, suction filtration and drying treatment in an inert gas atmosphere to obtain the flaky Mxene.
Optionally, the rare earth chelate includes a rare earth ytterbium chelate and a rare earth yttrium chelate.
Optionally, the epoxy sealing paint coating comprises the following components in parts by weight: 48-52 parts of epoxy resin, 5-20 parts of aluminum oxide, 1-5 parts of titanium oxide, 5-10 parts of ferric oxide, 1.0-2.0 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 2-8 parts of active diluent, 25-27 parts of curing agent and 0.2-1 part of rare earth chelate.
Alternatively, the reactive diluent comprises ethylene glycol diglycidyl ether.
Alternatively, the epoxy resin includes one of bisphenol a type epoxy resin, bisphenol F type epoxy resin, glycidyl ester epoxy resin, alicyclic epoxy resin, and hydantoin epoxy resin.
Optionally, the curing agent comprises 50-90% of polyamide, 9-40% of alicyclic amine and 1-10% of first addition compound in percentage by weight, wherein the first addition compound is an addition compound of polyether amine and cyclosilane.
Optionally, the epoxy cloud iron intermediate paint coating comprises the following components in parts by weight: 30-40 parts of epoxy resin, 10-20 parts of cloud iron powder, 6-8 parts of talcum powder, 7-10 parts of aluminum oxide, 3-5 parts of barium sulfate, 5-7 parts of ferric oxide, 1-2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 2-5 parts of active diluent, 20-22 parts of curing agent and 0.2-1 part of rare earth chelate.
Optionally, the fluorocarbon finish paint coating comprises the following components in parts by weight: 43-47 parts of tetrafluororesin, 1.5-2.5 parts of titanium oxide, 1.5-2.5 parts of mica powder, 1.5-2.5 parts of boron nitride powder, 20-23 parts of butyl acetate, 1-2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 20-22 parts of curing agent and 0.2-1 part of rare earth chelate.
Optionally, the thickness of the Mxene modified water-based inorganic zinc-rich primer layer is 70-80 mu m, the thickness of the epoxy sealing paint coating is 70-90 mu m, the thickness of the epoxy cloud iron intermediate paint coating is 210-240 mu m, and the thickness of the fluorocarbon top paint coating is 70-90 mu m.
Compared with the prior art, the components of the Mxene modified water-based inorganic zinc-rich primer layer contain MXene materials, the MXene materials have extremely strong corrosion resistance, and the MXene materials are added into the primer layer, so that the corrosion resistance of the primer layer can be greatly improved, and the service life of the primer layer is prolonged; the MXene has excellent chemical stability and weather resistance, can improve the weather resistance of the primer layer, and reduces the problems of falling, peeling and the like of the coating; the addition of the flaky Mxene can enable the primer layer coating to have thixotropic property, can reduce the addition amount of the solvent, and is beneficial to reducing the VOCs content of the primer layer coating. The Mxene-based anticorrosive coating system provided by the invention has the main effects that the MXene modified aqueous inorganic zinc-rich primer layer is used as a first layer of coating, the anticorrosive protection of a steel structure is provided, the sheet MXene and zinc-rich particles are added in the primer layer, the sheet MXene can improve the adhesive force between the coating and the steel structure, and the zinc-rich particles can provide barrier performance and anticorrosive effect; the epoxy sealing paint layer is used as a second layer of coating, and has the main functions of sealing the primer layer, increasing the thickness and durability of the coating, and the epoxy resin in the coating has good adhesive force and corrosion resistance, so that the primer layer can be effectively protected from being corroded by the external environment; the epoxy cloud iron intermediate paint coating is used as a third layer of coating, and has the main effects of increasing the wear resistance and weather resistance of the coating, wherein the cloud iron powder in the coating is a special pigment, has excellent ultraviolet resistance and weather resistance, and can effectively prevent the coating from fading and aging; the fluorocarbon finish paint coating is used as the outermost layer coating, and has the main functions of providing weather resistance and chemical corrosion resistance of the coating, and fluorocarbon resin in the coating has excellent weather resistance and chemical corrosion resistance and can effectively protect the coating from corrosion of ultraviolet rays, acid and alkali and other corrosive mediums. In the invention, the Mxene modified water-based inorganic zinc-rich primer layer, the epoxy sealing paint coating, the epoxy cloud iron intermediate paint coating and the fluorocarbon finish paint coating are matched with each other, so that the comprehensive protection of the bridge steel structure can be provided, the problems of corrosion, abrasion, oxidation and the like are prevented, and the service life of the bridge is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of an Mxene-based corrosion protection coating system in an embodiment of the present invention after being combined with a steel structure.
Reference numerals illustrate:
1. an Mxene modified water-based inorganic zinc-rich primer layer, 2 an epoxy sealing paint coating, 3 an epoxy cloud iron intermediate paint coating, 4 a fluorocarbon finish paint coating, 5 a steel structure.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
It should be noted that, without conflict, features in the embodiments of the present invention may be combined with each other. The terms "comprising," "including," "containing," and "having" are intended to be non-limiting, as other steps and other ingredients not affecting the result may be added. The above terms encompass the terms "consisting of … …" and "consisting essentially of … …". Materials, equipment, reagents are commercially available unless otherwise specified.
As shown in fig. 1, the embodiment of the invention provides an anti-corrosion coating system based on Mxene, which comprises an Mxene modified water-based inorganic zinc-rich primer layer 1, an epoxy sealing paint coating 2, an epoxy cloud iron intermediate paint coating 3 and a fluorocarbon top paint coating 4; the Mxene modified aqueous inorganic zinc-rich primer layer 1 is coated on the surface of the steel structure 5, and the Mxene modified aqueous inorganic zinc-rich primer layer 1 comprises the following components in parts by weight: 0.5-3 parts of flaky MXanee, 19-21 parts of ethyl orthosilicate, 2-4 parts of water, 6-8 parts of propylene glycol methyl ether, 1.5-2.5 parts of alumina, 5-7 parts of phosphorus iron powder, 1.5-2.5 parts of titanium oxide, 0.8-1.2 parts of silicon carbide, 2-4 parts of cloud iron powder, 1.5-2.5 parts of boron nitride, 1.5-2.5 parts of polyvinyl butyral, 0.2-1 part of rare earth chelate, 62.5-67.8 parts of zinc powder, 0.4-0.6 part of zinc chloride, 0.4-0.6 part of stannous chloride and 0.8-1.2 parts of silver nitrate.
As a novel two-dimensional material, the MXene has a plurality of excellent performances and characteristics, and the MXene has excellent chemical stability and weather resistance, so that the weather resistance of a primer layer can be improved, and the problems of falling, peeling, skinning and the like are reduced. In addition, MXene as a filler material can improve the electrical conductivity, mechanical strength, and damping properties of the coating for the following specific reasons: MXene has higher conductivity, and can increase the conductivity of the coating. The conductive performance of MXene is superior to that of the traditional filler materials such as carbon nano tubes and graphene, so that the conductive performance of the coating can be improved, and the coating has better conductive characteristics; MXene has high strength and excellent mechanical properties, and can increase the mechanical strength of the coating. The high strength of MXene can increase the tensile strength and wear resistance of the coating, giving it better mechanical properties. The MXene has good damping performance, can improve the damping performance of the coating, and can reduce the stress and deformation of the coating under vibration and impact load, thereby improving the damping performance of the coating and enabling the coating to have better vibration resistance and impact resistance.
In the Mxene modified water-based inorganic zinc-rich primer layer 1, zinc powder is used as a barrier layer in the coating, so that the coating has excellent antirust performance and corrosion resistance, and the specific reasons are as follows: the zinc powder forms a layer of compact zinc oxide film in the coating, so that the invasion of air, moisture and other corrosive media can be effectively blocked, and the corrosion reaction of the metal surface can be reduced. The zinc powder has a negative potential, and a zinc powder film formed in the coating can be used as a cathode to form a battery with the metal substrate, so that current is formed, the metal substrate becomes an anode, and electrochemical corrosion reaction of metal is hindered; when zinc powder corrodes in the coating, zinc ions are released, and can diffuse in the coating and react with other components in the coating to form new zinc compounds, so that damage in the coating is repaired, and the corrosion resistance of the coating is improved. The zinc powder has higher chemical activity, can react with other metal ions to form a layer of compact compound, and further improves the rust resistance and corrosion resistance of the coating.
In the Mxene modified aqueous inorganic zinc-rich primer layer 1 of the present invention, ethyl orthosilicate is an organosilicon compound, which can provide a coating with higher adhesion and better durability as a base material, for the following specific reasons: the ethyl orthosilicate can undergo hydrolysis reaction in the coating to produce ethyl silicate and ethanol. The ethyl silicate may chemically react with the substrate surface to form chemical bonds, thereby increasing the adhesion of the coating to the substrate. The tetraethoxysilane molecules contain silicon-oxygen bonds, the strength of the bonds is higher, and stronger coating adhesive force can be provided. The tetraethoxysilane can be subjected to crosslinking reaction with other organosilicon compounds or organic polymers to form a three-dimensional network structure, so that the durability and the chemical corrosion resistance of the coating are improved. The tetraethoxysilane has higher heat resistance and can keep the stability and adhesive force of the coating in a high-temperature environment.
In the Mxene modified water-based inorganic zinc-rich primer layer 1, silicon carbide can enhance the hardness, wear resistance and high temperature resistance of the coating, and the specific reasons are as follows: silicon carbide has a very high hardness, close to diamond, far higher than most metallic and ceramic materials. Thus, the addition of silicon carbide as a filler to the coating can significantly increase the hardness of the coating, making it more resistant to abrasion and scratching. Silicon carbide has excellent wear resistance. The silicon carbide has good wear resistance and can resist friction and abrasion, so the silicon carbide filler is added to enable the coating to have better wear resistance and prolong the service life of the coating. Silicon carbide has excellent high temperature resistance. Silicon carbide has a high melting point and good thermal stability, and can maintain its hardness and strength in a high temperature environment. Therefore, the silicon carbide filler is added into the coating, so that the high temperature resistance of the coating can be obviously improved, and the coating can stably work for a long time in a high temperature environment.
In the Mxene modified aqueous inorganic zinc-rich primer layer 1 of the present invention, the polyvinyl butyral has the following characteristics, so that it contributes to uniformly dispersing other components: the polyvinyl butyral has a plurality of hydroxyl (-OH) functional groups on the molecular chain, which can form hydrogen bonds or physical crosslinks with other components, thereby promoting the dispersion of the components. The high dispersibility of polyvinyl butyral allows it to uniformly disperse other components in a coating, avoiding agglomeration or precipitation between the components. The polyvinyl butyral has higher viscosity, and can increase the viscosity of the coating, so that other components are better suspended in the liquid, and precipitation or agglomeration is avoided. The high-viscosity polyvinyl butyral can form a net structure in the paint, so that the viscosity and the consistency of the paint are increased, and other components can be uniformly dispersed. The polyvinyl butyral has good compatibility, can be mutually dissolved or dispersed with various components, and can not generate phase separation or phase instability, and the good compatibility is favorable for uniformly dispersing other components, so that various components in the coating can be fully dissolved or dispersed, and the uniformity and stability of the coating are improved.
Compared with the prior art, the Mxene modified aqueous inorganic zinc-rich primer layer contains MXene materials, and the MXene materials have extremely strong corrosion resistance, and can greatly improve the corrosion resistance of the primer layer and prolong the service life of the primer layer when being added into the primer layer; the MXene has excellent chemical stability and weather resistance, can improve the weather resistance of the primer layer, and reduces the problems of falling, peeling and the like of the coating; the addition of the flaky Mxene can enable the primer layer coating to have thixotropic property, can reduce the addition amount of the solvent, and is beneficial to reducing the VOCs content of the primer layer coating. The Mxene-based anticorrosive coating system provided by the invention has the main effects that the MXene modified aqueous inorganic zinc-rich primer layer is used as a first layer of coating, the anticorrosive protection of a steel structure is provided, the sheet MXene and zinc-rich particles are added in the primer layer, the sheet MXene can improve the adhesive force between the coating and the steel structure, and the zinc-rich particles can provide barrier performance and anticorrosive effect; the epoxy sealing paint layer is used as a second layer of coating, and has the main functions of sealing the primer layer, increasing the thickness and durability of the coating, and the epoxy resin in the coating has good adhesive force and corrosion resistance, so that the primer layer can be effectively protected from being corroded by the external environment; the epoxy cloud iron intermediate paint coating is used as a third layer of coating, and has the main effects of increasing the wear resistance and weather resistance of the coating, wherein the cloud iron powder in the coating is a special pigment, has excellent ultraviolet resistance and weather resistance, and can effectively prevent the coating from fading and aging; the fluorocarbon finish paint coating is used as the outermost layer coating, and has the main functions of providing weather resistance and chemical corrosion resistance of the coating, and fluorocarbon resin in the coating has excellent weather resistance and chemical corrosion resistance and can effectively protect the coating from corrosion of ultraviolet rays, acid and alkali and other corrosive mediums. In the invention, the Mxene modified water-based inorganic zinc-rich primer layer, the epoxy sealing paint coating, the epoxy cloud iron intermediate paint coating and the fluorocarbon finish paint coating are matched with each other, so that the comprehensive protection of the bridge steel structure can be provided, the problems of corrosion, abrasion, oxidation and the like are prevented, and the service life of the bridge is prolonged.
In some embodiments of the present invention, the preparation method of the flaky Mxene includes:
step A1, adding carbon titanium aluminum into a mixed solution composed of lithium fluoride and hydrochloric acid, stirring and reacting for 24-48 hours at 30-50 ℃, and collecting a precipitation product;
and A2, adding water into the precipitate, and carrying out ultrasonic treatment, centrifugation, suction filtration and drying treatment in an inert gas atmosphere to obtain the flaky Mxene.
In some embodiments of the invention, the rare earth chelate includes a rare earth ytterbium chelate and a rare earth yttrium chelate.
In some embodiments of the present invention, the epoxy sealer coating 2 comprises the following components in parts by weight: 48-52 parts of epoxy resin, 5-20 parts of aluminum oxide, 1-5 parts of titanium oxide, 5-10 parts of ferric oxide, 1.0-2.0 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 2-8 parts of active diluent, 25-27 parts of curing agent and 0.2-1 part of rare earth chelate.
In the epoxy sealer coating 2, the epoxy resin is used as a base material, and excellent adhesive force and protective performance are provided in the coating; titanium oxide is used as white pigment in the coating to provide covering power, glossiness and weather resistance of the coating, aluminum oxide is used as filler in the coating, and the coating has wear resistance, high temperature resistance and chemical corrosion resistance, and ferric oxide has color and covering property in the coating and can provide color and aesthetic property of the coating; the curing agent comprises 50-90% of polyamide, 9-40% of alicyclic amine and 1-10% of first addition compound in percentage by mass, wherein the first addition compound is an addition compound of polyether amine and cyclosilane; the rare earth chelate comprises rare earth ytterbium chelate and rare earth yttrium chelate, and the rare earth ytterbium chelate and the rare earth yttrium chelate timely complex ferrous ions generated by rust in the coating, so that further rust can be prevented.
In some embodiments of the invention, the reactive diluent comprises ethylene glycol diglycidyl ether. The ethylene glycol diglycidyl ether can participate in the curing reaction of the epoxy resin and become a part of an epoxy resin crosslinking network, so that compared with a volatile solvent, the ethylene glycol diglycidyl ether can reduce the volatilization of the solvent, reduce the VOCs content of the paint of the sealing paint coating and enable the curing speed of the paint of the sealing paint coating to be faster.
In some embodiments of the invention, the epoxy resin comprises one of a bisphenol a type epoxy resin, a bisphenol F type epoxy resin, a glycidyl ester epoxy resin, a cycloaliphatic epoxy resin, and a hydantoin epoxy resin.
In some embodiments of the present invention, the epoxy cloud iron intermediate paint coating 3 comprises the following components in parts by weight: 30-40 parts of epoxy resin, 10-20 parts of cloud iron powder, 6-8 parts of talcum powder, 7-10 parts of aluminum oxide, 3-5 parts of barium sulfate, 5-7 parts of ferric oxide, 1-2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 2-5 parts of active diluent, 20-22 parts of curing agent and 0.2-1 part of rare earth chelate.
In the epoxy cloud iron intermediate paint coating 3, the epoxy resin is used as a base material, and excellent adhesive force and protective performance are provided in the coating; barium sulfate is used as a barrier layer in the coating, and can provide excellent flame retardant property and corrosion resistance; the ferric oxide has color and covering property in the coating, and can provide the color and the aesthetic property of the coating; talcum powder is used as a filler in the coating, so that the smoothness, wear resistance and corrosion resistance of the coating can be improved; alumina is used as filler in the coating, and has wear resistance, high temperature resistance and chemical corrosion resistance; the curing agent comprises 50-90% of polyamide, 9-40% of alicyclic amine and 1-10% of first addition compound in percentage by mass, wherein the first addition compound is an addition compound of polyether amine and cyclosilane; the rare earth chelate comprises rare earth ytterbium chelate and rare earth yttrium chelate, and the rare earth ytterbium chelate and the rare earth yttrium chelate timely complex ferrous ions generated by rust in the coating, so that further rust can be prevented.
In some embodiments of the present invention, the fluorocarbon topcoat 4 comprises the following components in parts by weight: 43-47 parts of tetrafluororesin, 1.5-2.5 parts of titanium oxide, 1.5-2.5 parts of mica powder, 1.5-2.5 parts of boron nitride powder, 20-23 parts of butyl acetate, 1-2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 20-22 parts of curing agent and 0.2-1 part of rare earth chelate.
In the fluorocarbon finish paint coating 4, the tetrafluororesin is a very corrosion-resistant and adhesion-resistant material for providing chemical inertness and anti-sticking performance of the coating, the boron nitride powder has high hardness and wear resistance in the coating, can provide the wear resistance and corrosion resistance of the coating, and the butyl acetate is used as a solvent for adjusting the viscosity and the fluidity of the coating; the curing agent comprises 50-90% of polyamide, 9-40% of alicyclic amine and 1-10% of first addition compound in percentage by mass, wherein the first addition compound is an addition compound of polyether amine and cyclosilane; the rare earth chelate comprises rare earth ytterbium chelate and rare earth yttrium chelate, and the rare earth ytterbium chelate and the rare earth yttrium chelate timely complex ferrous ions generated by rust in the coating, so that further rust can be prevented.
In some embodiments of the present invention, the Mxene modified aqueous inorganic zinc rich primer layer 1 has a thickness of 70-80 μm, the epoxy sealer coating 2 has a thickness of 70-90 μm, the epoxy cloud iron intermediate paint coating 3 has a thickness of 210-240 μm, and the fluorocarbon topcoat coating 4 has a thickness of 70-90 μm.
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The epoxy resin used in the following examples and comparative examples is hydrogenated bisphenol A epoxy resin of the type EP-4080E, the reactive diluent used is ethylene glycol diglycidyl ether, and the rare earth chelate compound used is a rare earth ytterbium chelate compound of the type REC-1 and a rare earth yttrium chelate compound of the type REC-2 manufactured by Texaban materials science and technology Co., ltd. In Shanxi, according to a mass ratio of 1:1, the composition is as follows; the curing agent used consisted of 70% polyamide, 24% cycloaliphatic amine, 6% first adduct of polyetheramine and cyclic gas silane. The tetrafluoro resin used was polytetrafluoroethylene.
Example 1 preparation of sheet Mxene
1.1, adding carbon titanium aluminum into a mixed solution composed of lithium fluoride and hydrochloric acid, stirring at 40 ℃ and 350r/min for reaction for 48 hours, and collecting a precipitate;
1.2, adding ethanol into the precipitate, performing ultrasonic treatment in ice water bath for 90min under nitrogen atmosphere, centrifuging for 60min at a rotation speed of 5000r/min, and performing suction filtration and drying treatment to obtain the flaky Mxene.
Example 2 preparation of Mxene modified aqueous inorganic Zinc-rich primer coating
2.1, preparing raw materials of an Mxene modified water-based inorganic zinc-rich primer layer coating, wherein the raw materials of the Mxene modified water-based inorganic zinc-rich primer layer coating comprise, by weight, 2 parts of flaky MXene, 20 parts of ethyl orthosilicate, 3 parts of water, 7 parts of propylene glycol methyl ether, 2 parts of aluminum oxide, 6 parts of ferrophosphorus powder, 2 parts of titanium oxide, 1 part of silicon carbide, 3 parts of cloud iron powder, 2 parts of boron nitride, 2 parts of polyvinyl butyral, 0.6 part of rare earth chelate, 65.0 parts of zinc powder, 0.5 part of zinc chloride, 0.5 part of stannous chloride and 1 part of silver nitrate;
2.2, uniformly mixing tetraethoxysilane, boron nitride, zinc powder, phosphorus iron powder, aluminum oxide, titanium oxide, cloud iron powder and silicon carbide, adding flaky Mxene, rare earth chelate, zinc chloride, stannous chloride and silver nitrate, further stirring and mixing, and finally adding water, propylene glycol methyl ether and polyvinyl butyral, and fully stirring until uniform slurry is formed, thus obtaining the Mxene modified water-based inorganic zinc-rich primer layer coating.
Example 3 preparation of epoxy sealing paint layer coating
3.1, preparing raw materials of an epoxy sealing paint layer, wherein the raw materials of the epoxy sealing paint layer comprise, by weight, 50 parts of epoxy resin, 12 parts of aluminum oxide, 3 parts of titanium oxide, 7 parts of ferric oxide, 1.5 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 5 parts of an active diluent, 26 parts of a curing agent and 0.6 part of a rare earth chelate;
3.2, uniformly mixing epoxy resin, aluminum oxide, titanium oxide and ferric oxide, then adding 2,4, 6-tris (dimethylaminomethyl) phenol, an active diluent and a rare earth chelate, and finally adding a curing agent to fully stir until uniform slurry is formed, thus obtaining the epoxy sealing paint layer coating.
Example 4 preparation of epoxy cloud iron intermediate paint coating
4.1, preparing raw materials of an epoxy cloud iron intermediate paint coating, wherein the raw materials of the epoxy cloud iron intermediate paint coating comprise, by weight, 35 parts of epoxy resin, 15 parts of cloud iron powder, 7 parts of talcum powder, 8 parts of aluminum oxide, 4 parts of barium sulfate, 6 parts of ferric oxide, 1.5 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 3.5 parts of reactive diluent, 21 parts of curing agent and 0.6 part of rare earth chelate;
and 4.2, uniformly mixing epoxy resin, talcum powder, aluminum oxide, cloud iron powder, barium sulfate and ferric oxide, then adding 2,4, 6-tris (dimethylaminomethyl) phenol, an active diluent and a rare earth chelate, and finally adding a curing agent to fully stir until uniform slurry is formed, thus obtaining the epoxy cloud iron intermediate paint coating.
Example 5 preparation of fluorocarbon topcoat coating
5.1, preparing raw materials of fluorocarbon finish paint coating, wherein the raw materials of fluorocarbon finish paint coating comprise, by weight, 45 parts of tetrafluororesin, 2 parts of titanium oxide, 2 parts of mica powder, 2 parts of boron nitride powder, 21 parts of butyl acetate, 1.5 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 21 parts of a curing agent and 0.6 part of rare earth chelate;
and 5.2, uniformly mixing the tetrafluoro resin, the titanium oxide, the boron nitride powder, the mica powder and the butyl acetate, then adding the 2,4, 6-tris (dimethylaminomethyl) phenol, the active diluent and the rare earth chelate, and finally adding the curing agent to fully stir until uniform slurry is formed, thus obtaining the fluorocarbon finish paint coating.
Example 6
An Mxene-based corrosion protection coating system consisting of an Mxene-modified aqueous inorganic zinc-rich primer layer coating prepared in example 2, an epoxy sealer coating prepared in example 3, an epoxy cloud iron intermediate paint coating prepared in example 4, and a fluorocarbon topcoat coating prepared in example 5 was prepared using the Mxene-modified aqueous inorganic zinc-rich primer layer coating, the epoxy sealer coating, the epoxy cloud iron intermediate paint coating, and the fluorocarbon topcoat coating, wherein the Mxene-modified aqueous inorganic zinc-rich primer layer, the epoxy sealer coating, the epoxy cloud iron intermediate paint coating, and the fluorocarbon topcoat coating were 75 μm, 80 μm, 225 μm, and 80 μm, respectively.
Example 7
An Mxene-based corrosion protection coating system consisting of an Mxene-modified aqueous inorganic zinc-rich primer layer coating prepared in example 2, an epoxy sealer coating prepared in example 3, an epoxy cloud iron intermediate paint coating prepared in example 4, and a fluorocarbon topcoat coating prepared in example 5 was prepared using the Mxene-modified aqueous inorganic zinc-rich primer layer coating, the epoxy sealer coating, the epoxy cloud iron intermediate paint coating, and the fluorocarbon topcoat coating, wherein the Mxene-modified aqueous inorganic zinc-rich primer layer, the epoxy sealer coating, the epoxy cloud iron intermediate paint coating, and the fluorocarbon topcoat coating were 85 μm, 80 μm, 215 μm, and 80 μm, respectively.
Example 8
An Mxene-based corrosion protection coating system consisting of an Mxene-modified aqueous inorganic zinc-rich primer layer coating prepared in example 2, an epoxy sealer coating prepared in example 3, an epoxy cloud iron intermediate paint coating prepared in example 4, and a fluorocarbon topcoat coating prepared in example 5 was prepared using the Mxene-modified aqueous inorganic zinc-rich primer layer coating, the epoxy sealer coating, the epoxy cloud iron intermediate paint coating, and the fluorocarbon topcoat coating, wherein the Mxene-modified aqueous inorganic zinc-rich primer layer, the epoxy sealer coating, the epoxy cloud iron intermediate paint coating, and the fluorocarbon topcoat coating were 75 μm, 80 μm, 235 μm, and 70 μm, respectively.
Comparative example 1
The same kind of anti-corrosion paint used by Guangdong tiger gate bridge is characterized in that an inorganic silicate zinc-rich primer is used as a bottom coating, the thickness is 80um, an epoxy iron red sealing paint is used as a sealing paint layer, the thickness is 25um, an epoxy cloud iron intermediate paint is used as an intermediate coating, the thickness is 80um, an acrylic polyurethane finishing paint is used as a top coating, the thickness is 60um, and the total thickness is 245um.
Comparative example 2
The same kind of anti-corrosion paint used by the sea cang bridge of Xiamen is used, the bottom coating is an inorganic silicate zinc-rich primer with the thickness of 80um, the sealing paint layer is an epoxy sealing paint with the thickness of 25um, the middle coating is an epoxy cloud iron intermediate paint with the thickness of 80um, the top coating is an aliphatic polyurethane top coating with the thickness of 80um and the total thickness of 265um.
Comparative example 3
The same kind of anti-corrosion paint used for Chongqing goose public rock bridge, the bottom coating uses inorganic silicate zinc-rich primer with the thickness of 70um, the sealing paint layer uses epoxy sealing paint with the thickness of 25um, the middle coating uses epoxy cloud iron intermediate paint with the thickness of 80um, the top coating uses acrylic polyurethane top coating with the thickness of 80um and the total thickness of 255um.
Experimental example
The Mxene modified aqueous inorganic zinc rich primer layer coating prepared in example 2 was tested for related properties and the results are shown in table 1. As can be seen from table 1, in the graphene-Mxene double-nano-sheet modified epoxy zinc-rich primer layer coating prepared in example 2, the nonvolatile content is 77%, which indicates that the solid content of the coating is higher and the protective performance is excellent; the VOCs content of the paint is 43g/L, and the VOCs content is very low, which indicates that the paint has very low volatility and can not cause too much pollution to the environment. The surface drying time of the coating is 0.4 hour, and the real drying time is 7.2 hours, which shows that the drying speed of the coating is higher. The heat resistance of the paint is 400 ℃ and the paint film is complete for 1 hour, which shows that the paint can bear higher temperature and is suitable for high-temperature working condition environment to a certain extent. The adhesion (pull-open method) of the coating was 5.8MPa, indicating that the coating has a strong bonding ability to the substrate. In conclusion, the test result of the product shows that the Mxene modified water-based inorganic zinc-rich primer layer coating prepared in the embodiment 2 has better stability, protective performance, coating effect and environmental protection performance.
TABLE 1
The epoxy sealer paint prepared in example 3 was tested for its properties and the results are shown in table 2. As can be seen from Table 2, the epoxy sealer paint prepared in example 3 was stirred to be free of hard lumps and in a uniform state; the coating has uniform mass of the mixture, has no coagulum phenomenon, and is suitable for construction. The non-volatile content in the coating is 77%, which indicates that the coating has higher solid content, and can improve the hardness, durability, adhesive force and chemical corrosion resistance of the coating. The surface drying time of the coating is 1.6h, and the actual drying time is 11h, which indicates that the drying speed of the coating is higher, the construction period can be shortened, and the production efficiency can be improved. The adhesive force test result shows that the adhesive strength between the coating and the substrate is 5.4MPa, and the coating has the property of firm combination with the substrate, so that the coating can not fall off or peel off in the long-term use process. The VOCs content of the paint is 135g/L, which indicates that the content of volatile organic compounds in the paint is within a reasonable control range and meets the requirement of environmental protection standards.
TABLE 2
The epoxy cloud iron intermediate paint coating prepared in example 4 was subjected to relevant performance tests, and the results are shown in table 3. As can be seen from Table 3, the nonvolatile content of the paint is 81%, which indicates that the product has lower volatility and is not easy to volatilize, thus being beneficial to protecting environment and human health; the surface drying time of the paint is 3.5 hours, and the real drying time is 22 hours, which indicates that the paint has shorter drying time, can improve the construction efficiency and shorten the construction period. The bending test result shows that the coating has certain flexibility. The impact resistance test result shows that the paint has better impact resistance and 50cm impact resistance, which shows that the paint has certain damage resistance when being impacted by force. The adhesive force test result shows that the adhesive force of the paint is 5.6MPa, which indicates that the adhesive strength between the paint and the base material is high, the paint is not easy to fall off, and the quality is reliable. The VOCs content of the paint is 144g/L, which indicates that the volatile organic compounds content in the paint is low, meets the environmental protection requirement, and has small influence on air quality.
TABLE 3 Table 3
The polysiloxane top coat paint prepared in example 5 was subjected to the relevant performance test, and the results are shown in table 4. As can be seen from Table 4, the fineness of the coating is 30um, which indicates that the coating has higher quality, and the surface of the coating prepared by using the coating is smooth and fine. The surface drying time of the paint is 1.7 hours, and the real drying time is 22 hours, which indicates that the paint has shorter drying time, can improve the construction efficiency and shorten the construction period. The bending test result shows that the coating has certain flexibility, and the surface is not easy to crack and foam. The impact resistance test result shows that the paint has better impact resistance and 50cm impact resistance, which shows that the paint has certain damage resistance when being impacted by force. The abrasion resistance test results show that the paint has good abrasion resistance and is not easy to produce phenomena such as scratch, abrasion and the like. The adhesive force test result shows that the adhesive force of the paint is 5.4MPa, which indicates that the adhesive strength between the paint and the base material is high, the paint is not easy to fall off, and the quality is reliable.
TABLE 4 Table 4
The surface drying time and the actual drying time are tested and referred to GB/T1728-2020, the adhesive force test method is referred to GB/T5210-2006, the salt spray resistance test is referred to GB/T10125, the impact resistance test is according to GB/T1732-2020, the ageing resistance test is referred to GB/T1865-2009, and the VOCs content test is referred to GB/T38597.
Salt spray resistance test, aging resistance test and VOCs content test were carried out on the anticorrosive coating systems in examples 6 to 8 and comparative examples 1 to 3, respectively, and the test results are shown in Table 5. Table 5 shows that the results of the salt spray resistance and ageing resistance tests of comparative examples 1 to 3 are greatly different from those of examples 6 to 8, the salt spray resistance is lower than 2000 hours, the artificial ageing resistance is lower than 3000 hours, and the salt spray resistance and the artificial ageing resistance of examples 6 to 8 are better and more in line with the requirements of bridge corrosion prevention. The corrosion protection coating systems of examples 6-8 have lower VOCs content and more in line with national standards and environmental protection concepts.
TABLE 5
Example 1 Example 2 Example 3 Comparative example 1 Comparative example 2 Comparative example 3
Salt spray resistance (h) 4000 4250 4300 2000 1600 1900
Artificial aging resistance (h) 5000 5300 4850 2600 2800 2700
VOCs content (g/L) 770 830 830 3550 3800 3650
In addition, although the present invention is disclosed above, the scope of the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.

Claims (10)

1. An anti-corrosion coating system based on Mxene is characterized by comprising an Mxene modified water-based inorganic zinc-rich primer layer (1), an epoxy sealing paint coating (2), an epoxy cloud iron intermediate paint coating (3) and a fluorocarbon top paint coating (4); the Mxene modified water-based inorganic zinc-rich primer layer (1) comprises the following components in parts by weight: 0.5-3 parts of flaky MXanee, 19-21 parts of ethyl orthosilicate, 2-4 parts of water, 6-8 parts of propylene glycol methyl ether, 1.5-2.5 parts of alumina, 5-7 parts of phosphorus iron powder, 1.5-2.5 parts of titanium oxide, 0.8-1.2 parts of silicon carbide, 2-4 parts of cloud iron powder, 1.5-2.5 parts of boron nitride, 1.5-2.5 parts of polyvinyl butyral, 0.2-1 part of rare earth chelate, 62.5-67.8 parts of zinc powder, 0.4-0.6 part of zinc chloride, 0.4-0.6 part of stannous chloride and 0.8-1.2 parts of silver nitrate.
2. The Mxene-based corrosion protection coating system according to claim 1, characterized in that the preparation method of the flaky Mxene comprises:
step A1, adding carbon titanium aluminum into a mixed solution composed of lithium fluoride and hydrochloric acid, stirring and reacting for 24-48 hours at 30-50 ℃, and collecting a precipitation product;
and A2, adding water into the precipitate, and carrying out ultrasonic treatment, centrifugation, suction filtration and drying treatment in an inert gas atmosphere to obtain the flaky Mxene.
3. The Mxene-based corrosion protection coating system of claim 1, characterized in that the rare earth chelates comprise rare earth ytterbium chelates and rare earth yttrium chelates.
4. The corrosion protection coating system based on Mxene according to claim 1, characterized in that the epoxy sealer coating (2) comprises the following components in parts by weight: 48-52 parts of epoxy resin, 5-20 parts of aluminum oxide, 1-5 parts of titanium oxide, 5-10 parts of ferric oxide, 1.0-2.0 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 2-8 parts of active diluent, 25-27 parts of curing agent and 0.2-1 part of rare earth chelate.
5. The Mxene-based corrosion protection coating system of claim 4, in which the reactive diluent comprises ethylene glycol diglycidyl ether.
6. The Mxene-based corrosion protection coating system of claim 4, in which the epoxy resin comprises one of bisphenol a type epoxy resin, bisphenol F type epoxy resin, glycidyl ester epoxy resin, cycloaliphatic epoxy resin and hydantoin epoxy resin.
7. The Mxene-based corrosion protection coating system according to claim 4, characterized in that the curing agent comprises 50-90% polyamide, 9-40% alicyclic amine, 1-10% first adduct, the first adduct being an adduct of polyetheramine and cyclosilane, in weight percent.
8. The Mxene-based corrosion protection coating system according to claim 1, characterized in that the epoxy cloud iron intermediate paint coating (3) comprises the following components in parts by weight: 30-40 parts of epoxy resin, 10-20 parts of cloud iron powder, 6-8 parts of talcum powder, 7-10 parts of aluminum oxide, 3-5 parts of barium sulfate, 5-7 parts of ferric oxide, 1-2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 2-5 parts of active diluent, 20-22 parts of curing agent and 0.2-1 part of rare earth chelate.
9. The Mxene-based corrosion protection coating system according to claim 1, characterized in that the fluorocarbon top coating (4) comprises the following components in parts by weight: 43-47 parts of tetrafluororesin, 1.5-2.5 parts of titanium oxide, 1.5-2.5 parts of mica powder, 1.5-2.5 parts of boron nitride powder, 20-23 parts of butyl acetate, 1-2 parts of 2,4, 6-tris (dimethylaminomethyl) phenol, 20-22 parts of curing agent and 0.2-1 part of rare earth chelate.
10. The Mxene-based corrosion protection coating system according to claim 1, characterized in that the Mxene modified aqueous inorganic zinc-rich primer layer (1) has a thickness of 70-80 μm, the epoxy sealer coating (2) has a thickness of 70-90 μm, the epoxy iron cloud intermediate paint coating (3) has a thickness of 210-240 μm, and the fluorocarbon top paint coating (4) has a thickness of 70-90 μm.
CN202310970947.4A 2023-08-03 2023-08-03 Anti-corrosion coating system based on Mxene Pending CN117070090A (en)

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