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CN115247019A - Coating structure with anti-corrosion function for bridge steel structure - Google Patents

Coating structure with anti-corrosion function for bridge steel structure Download PDF

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Publication number
CN115247019A
CN115247019A CN202211169685.3A CN202211169685A CN115247019A CN 115247019 A CN115247019 A CN 115247019A CN 202211169685 A CN202211169685 A CN 202211169685A CN 115247019 A CN115247019 A CN 115247019A
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mass
parts
coating
mixed solution
steel structure
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徐楚发
韩玲玲
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Rudong Yanfeng Steel Structure Co ltd
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Rudong Yanfeng Steel Structure Co ltd
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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
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
    • B05D3/102—Pretreatment of metallic substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • 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
    • 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
    • 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
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2301/00—Inorganic additives or organic salts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2320/00—Organic additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2504/00—Epoxy polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2508/00—Polyesters
    • 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
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0893—Zinc
    • 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

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  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
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  • General Chemical & Material Sciences (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention discloses a coating structure with an anti-corrosion effect on a bridge steel structure, and relates to the technical field of anti-corrosion coatings, wherein the coating structure comprises 20 to 60 parts by mass of epoxy resin, 4 to 6 parts by mass of zinc powder, 0.3 to 0.5 part by mass of a dispersant, 20 to 30 parts by mass of xylene, and super-high molecular weight polyethylenePerforming sound dispersion for 20min, and forming a pre-emulsion A based on 30-50 parts by mass of n-butyl alcohol and 20-30 parts by mass of polyester resin; adding 0.2 to 0.3 part by mass of defoaming agent and 0.2 to 0.3 part by mass of Si 3 N 4 1 to 3 parts of particle filler, 10 to 15 parts of synthetic resin curing agent by mass are added into a reaction vessel to obtain an anticorrosive paint, and the anticorrosive paint is sprayed on a steel structure with a clean surface. The continuity and compactness of the coating are improved, the permeation of corrosive substances in the coating is effectively slowed down, and the corrosion resistance of the coating can be obviously improved by adding silicate into the anticorrosive coating.

Description

Coating structure with anti-corrosion function for bridge steel structure
Technical Field
The invention relates to the technical field of anticorrosive coatings, in particular to a coating structure with an anticorrosive effect on a bridge steel structure.
Background
Corrosion is a phenomenon in which when a metal comes into contact with the environment, a chemical reaction occurs between the metal surface and active species (e.g., oxygen, water, and salts) in the surrounding environment, producing chemically more stable compounds, and degrading the material properties. The corrosion usually causes the reduction of the mechanical property and chemical stability of the material, thereby causing accidents, such as the rupture of petroleum pipelines, the collapse of bridges and the like, and causing serious influence on various industries.
The steel structure is corroded particularly fast in a salt spray environment, the traditional epoxy zinc-rich coating achieves the purpose of sacrificing an anode by utilizing the characteristic that the metal activity of zinc powder is stronger than that of iron, metal substrates such as steel and the like are subjected to cathode protection, and meanwhile, zinc salt generated after zinc powder is oxidized can fill the defects of a coating, so that the corrosion medium is prevented from permeating, and a certain self-repairing effect is achieved;
therefore, when the existing steel structure is in a salt spray environment, a coating structure which plays a role in corrosion prevention is usually arranged outside the existing steel structure, but the coating structure based on the epoxy zinc-rich paint has a limited service life due to the fact that zinc powder is sacrificed, an effective barrier is difficult to establish due to the limited film forming capability of the paint, and the salt spray resistance of the coating structure is limited.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a coating structure with an anti-corrosion effect on a bridge steel structure, which is characterized in that graphene oxide and modified Al are added or replaced in the traditional anti-corrosion coating 2 O 3 ·SiO 2 Preparing a new corrosion-resistant coating from the material; at least containing Si in mass part 3 N 4 1 to 3 parts of particle filler, 4 to 6 parts of graphene oxide and modified Al 2 O 3 ·SiO 2 10 to 15 parts, endowing the corrosion-resistant coating with better corrosion resistance, prolonging the service life of the corrosion-resistant coating in a salt spray environment, and solving the problems in the background art.
(II) technical scheme
In order to achieve the above purpose, the invention is implemented by the following technical schemeThe realization is as follows: a preparation method of an anticorrosive paint applied to a bridge steel structure comprises the following steps: step one, preparing graphene oxide; step two, preparing modified Al 2 O 3 ·SiO 2 A material; step three, preparing corrosion-resistant paint; wherein, the pre-emulsion B is formed by ultrasonically dispersing 20 to 60 parts by mass of epoxy resin, 4 to 6 parts by mass of zinc powder, 0.3 to 0.5 part by mass of dispersant and 20 to 30 parts by mass of xylene for 20 min; heating to 80 ℃ to form a pre-emulsion A based on 30-50 parts by mass of n-butyl alcohol and 20-30 parts by mass of polyester resin; mixing the pre-emulsion B and the pre-emulsion A, centrifuging, and adding 0.2-0.3 part by mass of an antifoaming agent and 0.2-0.3 part by mass of Si 3 N 4 1 to 3 parts of particle filler are mixed at high speed, 10 to 15 parts of synthetic resin curing agent by mass are added into a reaction vessel and dispersed at high speed for 10min to obtain the anticorrosive paint.
Further, the first step is to prepare graphene oxide; the method comprises the following steps: s101, sequentially adding NaNO into a three-neck flask under the condition of ice-water mixed bath 3 Graphite powder and 150mL of concentrated sulfuric acid; s102, stirring the mixed solution by a magnetic stirrer at the speed of 400r/min until the mixed solution turns into black, and slowly adding KMnO into the mixed solution 4 A particle; s103, continuously stirring the mixed solution for at least 30min by using a magnetic stirrer under the constant temperature condition that the water bath temperature is 30-40 ℃.
Further, the first step is to prepare graphene oxide; further comprising: s104, under the condition of external ventilation, adding 150mL of distilled water into the mixed solution, preserving heat at 90 ℃, and continuously stirring for at least 15min by using a magnetic stirrer; after the mixed solution is cooled, removing insoluble substances through centrifugal treatment; s105, introducing the oxidized graphite-containing liquid into distilled water, and diluting the reactant; adding 15mL of hydrogen peroxide with the concentration of 30% into the mixed solution, and stirring while adding until all the hydrogen peroxide is added.
Further, S106 exists after S105, the mixed solution is kept stand at room temperature until graphite oxide is precipitated at the bottom of the beaker, and supernatant is sucked under the condition of keeping the liquid level stable; centrifuging the rest precipitate with 10% (v/v) HF and distilled water alternately, drying the centrifuged product, and preparing graphene oxide; the fineness of the graphite powder is 7000 meshes.
Further, step two, preparing modified Al 2 O 3 ·SiO 2 A material, comprising: s201, cleaning Al 2 O 3 ·SiO 2 : measuring acetone solution, and adding Al 2 O 3 ·SiO 2 Performing ultrasonic dispersion on the particles for 30min, then alternately centrifuging by removing distilled water and absolute ethyl alcohol, and finally drying the obtained product in an oven to remove contained liquid; s202, hydrolyzing a silane coupling agent kh 560: putting a silane coupling agent kh560 and absolute ethyl alcohol into a three-neck flask, uniformly stirring and mixing, slowly dripping distilled water, stirring at the rotating speed of 350r/min, and hydrolyzing for 45min until the pH is about = 10; mixing Al 2 O 3 ·SiO 2 Adding the powder into the mixture, continuously stirring for at least 90min, washing with distilled water and anhydrous ethanol in sequence, centrifuging, placing the precipitate into an oven, adjusting to 60 deg.C, drying, taking out, and grinding to obtain silane coupling agent kh560 modified Al 2 O 3 ·SiO 2 。
Further, step three, preparing the corrosion-resistant coating: s301, adding distilled water and an emulsifier into a container, and ultrasonically dispersing 20-60 parts by mass of epoxy resin, 4-6 parts by mass of zinc powder, 0.3-0.5 part by mass of a dispersant and 20-30 parts by mass of xylene for 20min under high-speed stirring to form a pre-emulsion B; s302, sequentially adding distilled water and an emulsifier into a four-mouth bottle, adding 30-50 parts by mass of n-butyl alcohol and 20-30 parts by mass of polyester resin under high-speed stirring, and heating to 80 ℃ to form a pre-emulsion A.
Further, step three, preparing the corrosion-resistant coating: the method further comprises S303, adding 5-10% by mass of pre-emulsion A and 30-40% by mass of initiator solution into a reaction kettle, and then sequentially adding 4-6 parts by mass of thickening agent and graphene oxide, and modified Al 2 O 3 ·SiO 2 10 to 15 parts; maintaining the temperature at 85 deg.C, stirring at high speed for 15min to form mixed solution; s304, adding the residual pre-emulsion A and part of initiator solution into the mixed solution,preserving the heat for at least 60min; and after the heat preservation is finished, adding the pre-emulsion B and the residual initiator solution into the mixed solution, and preserving the heat for 60 to 120min to form an AB mixed solution.
Further, S305 is also present after S304, the temperature is reduced to 60 to 70 ℃, and the AB mixed liquid is subjected to centrifugal treatment under the constant temperature condition to eliminate unreacted residues; cooling to 45 ℃, and adding 0.2 to 0.3 part by mass of defoaming agent and 0.2 to 0.3 part by mass of Si 3 N 4 1 to 3 parts of particle filler are mixed at high speed, and insoluble substances are filtered; s306, adding 10-15 parts by mass of a synthetic resin curing agent into a reaction container, and dispersing at a high speed for 10min to obtain the anticorrosive paint.
An anticorrosive coating is applied to an anticorrosive coating of a bridge steel structure, and at least comprises the following components in parts by mass: xylene: 20 to 30; dispersing agent: 0.3 to 0.5; defoaming agent: 0.2 to 0.3; zinc powder: 4 to 6; 4 to 6 of graphene oxide; epoxy resin: 20 to 60; n-butanol: 30 to 50; curing agent: 10 to 15; 20-30 parts of polyester resin; modified Al 2 O 3 ·SiO 2 10~15。
An anti-corrosion coating structure applied to a bridge steel structure is prepared by the following steps: degreasing the surface of the steel structure by using acetone, and cleaning the surface by using ethanol; and (3) spraying the anticorrosive paint on a steel structure with a clean surface by using spraying equipment at a spraying distance of 25-30cm and a spraying pressure of 0.5MPa, wherein the thickness of a coating film is 100-150 mu m, and ventilating and drying for 2h at room temperature to form an anticorrosive coating structure.
(III) advantageous effects
The invention provides a coating structure with an anti-corrosion function for a bridge steel structure. The method has the following beneficial effects:
one end of the silane coupling agent kh560 has a siloxy group capable of reacting with hydroxyl on the surface of the aluminum silicate, the other end of the silane coupling agent kh560 has a modified alkyl group with hydrophobicity, the silane coupling agent kh has good compatibility with a nonpolar solvent and resin, modifier molecules can wrap aluminum silicate particles, the siloxy group of the silane coupling agent kh is combined with the surface of the aluminum silicate, the hydrophobic end of the alkyl group faces outwards to generate hydrophobicity, the silane coupling agent kh is well compatible with the solvent and the resin in the coating, and when the silane coupling agent kh560 is used as a coating, the silane coupling agent kh can endow a steel structure substrate with certain hydrophobic performance.
Graphene itself has special lamellar structure, shielding effect has been played, can prevent the infiltration of external medium effectively, graphene has formed electrically conductive network equally in the coating, improve the utilization efficiency of zinc powder, coating after adding graphene has obvious effect to the anticorrosive of substrate, the electric conductivity and the unique two-dimensional lamellar structure that graphene is excellent, form the hydrone, the fine and close isolated layer that micromolecule corrosion medium such as chloridion is difficult to pass through, the shielding performance of coating is by a wide margin, promote to have played the substitution to partial zinc powder in the traditional corrosion-resistant coating. The corrosion resistance of the coating can be enhanced.
The hydroxyl and other oxygen-containing functional groups on the surface of the graphene oxide react and combine with the epoxy resin, and meanwhile, the epoxy group can also combine with the hydroxyl on the surface of the steel structure through a chemical reaction, so that the adhesive force of the corrosion-resistant coating is increased, and the acting force generally exists between the epoxy resin and the steel structure.
Drawings
FIG. 1 is a schematic view of the preparation process of the anticorrosion coating structure applied to the bridge steel structure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides a preparation method of an anticorrosive coating applied to a bridge steel structure, including the following steps:
due to the strong pi-pi action between graphene sheet layers, agglomeration and defects are formed, and the immersion of a corrosive medium cannot be blocked. Therefore, the graphene is subjected to surface oxidation treatment and then reacts with organic matters to form the modified filler through covalent bonds, and the modified graphene and the epoxy resin have better compatibility.
Step one, preparing graphene oxide; the method comprises the following steps:
s101, sequentially adding NaNO into a three-neck flask under the condition of ice-water mixed bath 3 Graphite powder and 150mL of concentrated sulfuric acid, wherein NaNO 3 3.0g, and 6g of the fineness of the graphite powder is 7000 meshes;
s102, stirring the mixed solution by a magnetic stirrer at the speed of 400r/min until the mixed solution turns into black, and slowly adding KMnO into the mixed solution 4 Granules, totaling 9g;
s103, continuously stirring the mixed solution for at least 30min by using a magnetic stirrer under the constant temperature condition that the water bath temperature is 30-40 ℃;
s104, under the condition of external ventilation, adding 150mL of distilled water into the mixed solution, preserving heat at 90 ℃, and continuously stirring for at least 15min by using a magnetic stirrer;
after the mixed solution is cooled, removing insoluble substances through centrifugal treatment;
s105, introducing the oxidized graphite-containing liquid into distilled water, and diluting the reactant;
adding 15mL of hydrogen peroxide with the concentration of 30% into the mixed solution, and stirring while adding until all the hydrogen peroxide is added;
s106, standing the mixed solution at room temperature until graphite oxide is precipitated at the bottom of the beaker, and sucking supernatant liquor under the condition of keeping the liquid level stable;
the remaining precipitate was centrifuged alternately with 10% HF and distilled water, and the centrifuged product was dried to complete the graphene oxide preparation.
Graphene itself has special lamellar structure, the shielding effect has been played, can prevent the infiltration of external medium effectively, graphene has formed electrically conductive network in the coating is the same, improve the utilization efficiency of zinc powder, coating after adding graphene has obvious effect to the anticorrosive of substrate, the electric conductivity and the unique two-dimensional lamellar structure that graphene is excellent, form the hydrone, the fine and close isolated layer that micromolecule corrosion medium such as chlorion is difficult to pass through, the shielding property of coating is by a wide margin, it has played the substitution to promote partial zinc powder in the traditional corrosion-resistant coating. The corrosion resistance of the coating can be enhanced.
The reactive functional group contained in the graphene can react with the curing agent to form a stable chemical bond, so that the interaction force among resins is increased, the adhesion force of the coating is promoted, the coating serves as an excellent two-dimensional carbon material, the unique structure of the coating enables the graphene oxide to take care of the provided physical barrier effect, the anti-corrosion performance of the coating is improved, and the anti-corrosion coating can be well adapted to a salt spray environment.
The hydroxyl and other oxygen-containing functional groups on the surface of the graphene oxide react and combine with the epoxy resin, and meanwhile, the epoxy group can also combine with the hydroxyl on the surface of the steel structure through a chemical reaction, so that the adhesive force of the corrosion-resistant coating is increased, and the acting force generally exists between the epoxy resin and the steel structure.
Step two, preparing modified Al 2 O 3 ·SiO 2 A material comprising the following:
s201, cleaning Al 2 O 3 ·SiO 2 ：
A solution of 50mL of acetone was measured and Al was added thereto 2 O 3 ·SiO 2 The particle fineness is less than 10 mu m, then ultrasonic dispersion is carried out for 30min, then distilled water and absolute ethyl alcohol are removed for alternate centrifugation, and finally the obtained product is put into an oven for drying to remove the contained liquid;
s202, hydrolyzing a silane coupling agent kh 560:
putting 0.5g of silane coupling agent kh560 and 300g of absolute ethyl alcohol into a three-neck flask, uniformly stirring and mixing, slowly and dropwise adding 160g of distilled water, stirring at the rotating speed of 350r/min, and hydrolyzing for 45min until the pH is about = 10;
5g of Al 2 O 3 ·SiO 2 Adding the powder into the mixture, stirring for at least 90min, washing with distilled water and anhydrous ethanol, centrifuging,
putting the precipitate into a drying oven, adjusting the temperature to 60 ℃, drying, taking out and grinding to obtain the silane coupling agent kh560 modified Al 2 O 3 ·SiO 2 。
The silicate has good chemical inertia, can improve the corrosion resistance of the coating, such as neutral salt spray resistance, acid resistance, alkali resistance and the like, improves the continuity and compactness of the coating, effectively slows down the permeation of corrosive substances in the coating, and relieves the corrosion of steel substrates. Silicate is added into the anticorrosive paint, so that the corrosion resistance of the coating can be obviously improved.
One end of the silane coupling agent kh560 has a siloxy group capable of reacting with hydroxyl on the surface of the aluminum silicate, the other end of the silane coupling agent kh560 has a modified alkyl group with hydrophobicity, the silane coupling agent kh has good compatibility with a nonpolar solvent and resin, modifier molecules can wrap aluminum silicate particles, the siloxy group of the silane coupling agent kh is combined with the surface of the aluminum silicate, the hydrophobic end of the alkyl group faces outwards to generate hydrophobicity, the silane coupling agent kh is well compatible with the solvent and the resin in the coating, and when the silane coupling agent kh560 is used as a coating, the silane coupling agent kh can endow a steel structure substrate with certain hydrophobic performance.
Step three, preparing the corrosion-resistant coating
S301, adding distilled water and an emulsifier into a container, and ultrasonically dispersing 40 parts by mass of epoxy resin, 5 parts by mass of zinc powder, 0.4 part by mass of a dispersing agent and 25 parts by mass of dimethylbenzene for 20min under high-speed stirring to form a pre-emulsion B;
s302, sequentially adding distilled water and an emulsifier into a four-mouth bottle, adding 40 parts by mass of n-butyl alcohol and 25 parts by mass of polyester resin under high-speed stirring, and heating to 80 ℃ to form a pre-emulsion A;
s303, adding 7.5 mass percent of pre-emulsion A and 35 mass percent of initiator solution into a reaction kettle, and then sequentially adding 4-6 mass parts of thickening agent, 4-6 mass parts of graphene oxide and modified Al 2 O 3 ·SiO 2 10 to 15 parts by mass;
maintaining the temperature at 85 deg.C, stirring at high speed for 15min to form mixed solution;
s304, adding the residual pre-emulsion A and part of initiator solution into the mixed solution, and keeping the temperature for at least 60min;
after the heat preservation is finished, adding the pre-emulsion B and the rest initiator solution into the mixed solution, and preserving the heat for 60 to 120min to form an AB mixed solution;
s305, cooling to 60-70 ℃, and centrifuging the AB mixed solution at constant temperature to eliminate unreacted residues;
cooling to 45 ℃, and adding 0.25 part by mass of defoaming agentPart Si 3 N 4 1 to 3 parts by mass of a particle filler, mixing at a high speed, and filtering insoluble substances;
s306, adding 12.5 parts by mass of synthetic resin curing agent into a reaction vessel, and dispersing at high speed for 10min to obtain the anticorrosive paint.
The epoxy resin anticorrosive paint has good chemical corrosion resistance, salt mist resistance and alkali corrosion resistance, can be matched with various resins, fillers and anticorrosive additives for use, and is particularly suitable for protecting steel structures in severe corrosive environments based on the epoxy resin heavy anticorrosive paint.
Si 3 N 4 The coating is a covalent bond compound with strong bonding property, has strong stability, can resist corrosion of various acids and alkalis except hydrofluoric acid, can resist etching of molten nonferrous metals, has good wear resistance and small friction coefficient, can endow a corrosion-resistant coating with better strength and wear resistance, and can prolong the service life of the coating structure in a salt spray environment.
Example 2
Referring to fig. 1, the present invention provides an anti-corrosion coating structure applied to a bridge steel structure, including the following steps:
step four, preparing the steel structure anticorrosive coating: including the following aspects in that,
s401, degreasing the surface of the steel structure by using acetone, and cleaning the surface by using ethanol;
s402, spraying the anticorrosive paint on a steel structure with a clean surface by using spraying equipment, keeping the spraying distance of 25-30cm and the spraying pressure of 0.5MPa, wherein the thickness of a coating film is 100-150 mu m,
and S403, ventilating and drying for 2h at room temperature to form an anticorrosive coating structure.
Example 3
Referring to fig. 1, the invention provides an anticorrosive coating, which is applied to a bridge steel structure to serve as an anticorrosive coating, and is prepared by the method, wherein the anticorrosive coating at least comprises the following components: xylene: 20 to 30 parts by mass; dispersing agent: 0.3 to 0.5 parts by mass; defoaming agent: 0.2 to 0.3 parts by mass; zinc powder: 4 to 6 parts by mass; 4-6 parts by mass of graphene oxide; epoxy resin: 20 to 60 parts by mass; n-butanol: 30 to 50 parts by mass; curing agent: 10 to 15 parts by mass; poly(s) are polymerized20 to 30 parts by mass of an ester resin; modified Al 2 O 3 ·SiO 2 10 to 15 parts by mass.
Experimental example 1:
40 parts by mass of epoxy resin, 5 parts by mass of zinc powder, 0.4 part by mass of a dispersing agent and 25 parts by mass of xylene, and ultrasonically dispersing for 20min to form a pre-emulsion B;
adding distilled water and an emulsifier, and adding 40 parts by mass of n-butanol and 25 parts by mass of polyester resin under high-speed stirring; heating to 80 ℃ to form a pre-emulsion A;
adding 7.5 mass percent of pre-emulsion A and 35 mass percent of initiator solution into a reaction kettle, and then sequentially adding a thickening agent, 4 parts by mass of graphene oxide and modified Al 2 O 3 ·SiO 2 10 parts of a mixed solution is formed;
adding the residual pre-emulsion A and part of the initiator solution into the mixed solution, and adding the pre-emulsion B and the residual initiator solution into the mixed solution to form AB mixed solution;
adding 0.25 mass part of defoaming agent and Si 3 N 4 2 parts by mass of particle filler, mixing at high speed, and filtering insoluble substances;
adding 12.5 parts by mass of synthetic resin curing agent into a reaction vessel, and dispersing at high speed for 10min to obtain the anticorrosive paint;
and (3) keeping the spraying distance of 27.5cm from the steel structure and the spraying pressure of 0.5MPa by using spraying equipment, and spraying the corrosion-resistant coating on a steel plate with a clean surface, wherein the thickness of a dry film is 125 mu m to form the corrosion-resistant coating, thereby obtaining the coating T1.
Experimental example 2:
40 parts by mass of epoxy resin, 5 parts by mass of zinc powder, 0.4 part by mass of a dispersing agent and 25 parts by mass of xylene, and ultrasonically dispersing for 20min to form a pre-emulsion B;
adding distilled water and an emulsifier, and adding 40 parts by mass of n-butanol and 25 parts by mass of polyester resin under high-speed stirring; heating to 80 ℃ to form a pre-emulsion A;
adding 7.5 mass percent of pre-emulsion A and 35 mass percent of initiator solution into a reaction kettle, and then sequentially adding 5 mass parts of thickening agent, 5 parts of graphene oxide and modified Al 2 O 3 ·SiO 2 10 parts by mass in the form ofForming a mixed solution;
adding the residual pre-emulsion A and part of the initiator solution into the mixed solution, and adding the pre-emulsion B and the residual initiator solution into the mixed solution to form AB mixed solution;
adding 0.25 mass part of defoaming agent and Si 3 N 4 2 parts by mass of particle filler, mixing at high speed, and filtering insoluble substances;
adding 12.5 parts by mass of synthetic resin curing agent into a reaction vessel, and dispersing at high speed for 10min to obtain the anticorrosive paint;
and (3) keeping the spraying distance of 27.5cm from the steel structure and the spraying pressure of 0.5MPa by using spraying equipment, and spraying the corrosion-resistant coating on a steel plate with a clean surface, wherein the thickness of a dry film is 125 mu m to form the corrosion-resistant coating, thereby obtaining a coating T2.
Experimental example 3:
40 parts by mass of epoxy resin, 5 parts by mass of zinc powder, 0.4 part by mass of a dispersing agent and 25 parts by mass of dimethylbenzene, and performing ultrasonic dispersion for 20min to form a pre-emulsion B;
adding distilled water and an emulsifier, and adding 40 parts by mass of n-butanol and 25 parts by mass of polyester resin under high-speed stirring; heating to 80 ℃ to form a pre-emulsion A;
adding 7.5 mass percent of pre-emulsion A and 35 mass percent of initiator solution into a reaction kettle, and then sequentially adding 6 mass parts of thickening agent, 6 parts of graphene oxide and modified Al 2 O 3 ·SiO 2 10 parts by mass to form a mixed solution;
adding the residual pre-emulsion A and part of the initiator solution into the mixed solution, and adding the pre-emulsion B and the residual initiator solution into the mixed solution to form AB mixed solution;
adding 0.25 mass part of defoaming agent and Si 3 N 4 2 parts by mass of particle filler, mixing at high speed, and filtering insoluble substances;
adding 12.5 parts by mass of synthetic resin curing agent into a reaction vessel, and dispersing at a high speed for 10min to obtain the anticorrosive coating;
and (3) keeping the spraying distance of 27.5cm from the steel structure and the spraying pressure of 0.5MPa by using spraying equipment, and spraying the corrosion-resistant coating on a steel plate with a clean surface, wherein the thickness of a dry film is 125 mu m to form the corrosion-resistant coating, thereby obtaining a coating T3.
Experimental example 4:
40 parts by mass of epoxy resin, 5 parts by mass of zinc powder, 0.4 part by mass of a dispersing agent and 25 parts by mass of xylene, and ultrasonically dispersing for 20min to form a pre-emulsion B;
adding distilled water and an emulsifier, and adding 40 parts by mass of n-butanol and 25 parts by mass of polyester resin under high-speed stirring; heating to 80 ℃ to form a pre-emulsion A;
adding 7.5 mass percent of pre-emulsion A and 35 mass percent of initiator solution into a reaction kettle, and then sequentially adding a thickening agent, 4 parts by mass of graphene oxide and modified Al 2 O 3 ·SiO 2 15 parts by mass to form a mixed solution;
adding the residual pre-emulsion A and part of the initiator solution into the mixed solution, and adding the pre-emulsion B and the residual initiator solution into the mixed solution to form AB mixed solution;
adding 0.25 mass part of defoaming agent and Si 3 N 4 2 parts by mass of particle filler, mixing at high speed, and filtering insoluble substances;
adding 12.5 parts by mass of synthetic resin curing agent into a reaction vessel, and dispersing at high speed for 10min to obtain the anticorrosive paint;
and (3) keeping the spraying distance of 27.5cm from the steel structure and the spraying pressure of 0.5MPa by using spraying equipment, and spraying the corrosion-resistant coating on a steel plate with a clean surface, wherein the thickness of a dry film is 125 mu m to form the corrosion-resistant coating, thereby obtaining a coating T4.
Experimental example 5:
40 parts by mass of epoxy resin, 5 parts by mass of zinc powder, 0.4 part by mass of a dispersing agent and 25 parts by mass of dimethylbenzene, and performing ultrasonic dispersion for 20min to form a pre-emulsion B;
adding distilled water and an emulsifier, and adding 40 parts by mass of n-butanol and 25 parts by mass of polyester resin under high-speed stirring; heating to 80 ℃ to form a pre-emulsion A;
adding 7.5 mass percent of pre-emulsion A and 35 mass percent of initiator solution into a reaction kettle, and then sequentially adding 5 mass parts of thickening agent, 5 parts of graphene oxide and modified Al 2 O 3 ·SiO 2 15 parts by mass to form a mixed solution;
adding the residual pre-emulsion A and part of the initiator solution into the mixed solution, and adding the pre-emulsion B and the residual initiator solution into the mixed solution to form AB mixed solution;
adding 0.25 mass part of defoaming agent and Si 3 N 4 2 parts by mass of particle filler, mixing at high speed, and filtering insoluble substances;
adding 12.5 parts by mass of synthetic resin curing agent into a reaction vessel, and dispersing at high speed for 10min to obtain the anticorrosive paint;
and (3) keeping the spraying distance of 27.5cm from the steel structure and the spraying pressure of 0.5MPa by using spraying equipment, and spraying the corrosion-resistant coating on a steel plate with a clean surface, wherein the thickness of a dry film is 125 mu m to form the corrosion-resistant coating, thereby obtaining a coating T5.
Experimental example 6:
40 parts by mass of epoxy resin, 5 parts by mass of zinc powder, 0.4 part by mass of a dispersing agent and 25 parts by mass of xylene, and ultrasonically dispersing for 20min to form a pre-emulsion B;
adding distilled water and an emulsifier, and adding 40 parts by mass of n-butyl alcohol and 25 parts by mass of polyester resin under high-speed stirring; heating to 80 ℃ to form pre-emulsion A;
adding 7.5 mass percent of pre-emulsion A and 35 mass percent of initiator solution into a reaction kettle, and then sequentially adding 6 mass parts of thickening agent, 6 mass parts of graphene oxide and modified Al 2 O 3 ·SiO 2 15 parts by mass to form a mixed solution;
adding the residual pre-emulsion A and part of the initiator solution into the mixed solution, and adding the pre-emulsion B and the residual initiator solution into the mixed solution to form AB mixed solution;
adding 0.25 mass part of defoaming agent and Si 3 N 4 2 parts by mass of particle filler, mixing at high speed, and filtering insoluble substances;
adding 12.5 parts by mass of synthetic resin curing agent into a reaction vessel, and dispersing at high speed for 10min to obtain the anticorrosive paint;
and (3) keeping the spraying distance of 27.5cm from the steel structure and the spraying pressure of 0.5MPa by using spraying equipment, and spraying the corrosion-resistant coating on a steel plate with a clean surface, wherein the thickness of a dry film is 125 mu m to form the corrosion-resistant coating, thereby obtaining a coating T6.
Sample detection:
the material and treatment of a tinplate, a steel plate and an iron rod for experiments are in accordance with the regulation of GB/T9271-2008, a steel plate and an iron rod subjected to sand blasting are selected to prepare a sample, the derusting grade reaches the Sa2.5 grade regulated in GB/T8923-2011, a neutral salt spray resistant experiment is carried out according to the regulation of GB/T1771-2007, the sample is taken out after the experiment is finished, the surface phenomenon of a coating is observed, and the method is described according to GB/T1766-2008; neutral saline resistance was tested as per JG/T224-2007.
The following test results are obtained in Table 1
TABLE 1 Performance test Table of Corrosion-resistant coating for Steel Structure
Figure 617668DEST_PATH_IMAGE002
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A preparation method of an anticorrosive paint applied to a bridge steel structure is characterized by comprising the following steps: the method comprises the following steps: step one, preparing graphene oxide; step two, preparing modified Al 2 O 3 ·SiO 2 A material; step three, preparing corrosion-resistant paint;
wherein, based on 20 to 60 parts by mass of epoxy resin, 4 to 6 parts by mass of zinc powder, 0.3 to 0.5 part by mass of dispersant and 20 to 30 parts by mass of xylene, ultrasonic dispersion is carried out for 20min to form a pre-emulsion B;
heating to 80 ℃ to form a pre-emulsion A based on 30-50 parts by mass of n-butyl alcohol and 20-30 parts by mass of polyester resin;
mixing the pre-emulsion B and the pre-emulsion A, centrifuging, and adding 0.2-0.3 part by mass of an antifoaming agent and 0.2-0.3 part by mass of Si 3 N 4 1 to 3 parts of particle filler are mixed at high speed, 10 to 15 parts of synthetic resin curing agent by mass are added into a reaction vessel, and the mixture is stirred at high speedDispersing for 10min to obtain the anticorrosive paint.
2. The preparation method of the anticorrosive paint applied to the bridge steel structure according to claim 1, characterized by comprising the following steps: firstly, preparing graphene oxide; the method comprises the following steps:
s101, sequentially adding NaNO into a three-neck flask under the condition of ice-water mixed bath 3 Graphite powder and 150mL of concentrated sulfuric acid;
s102, stirring the mixed solution by a magnetic stirrer at the speed of 400r/min until the mixed solution turns into black, and slowly adding KMnO into the mixed solution 4 Particles;
s103, continuously stirring the mixed solution for at least 30min by using a magnetic stirrer under the constant temperature condition that the water bath temperature is 30 to 40 ℃.
3. The preparation method of the anticorrosive paint applied to the bridge steel structure according to claim 2, characterized by comprising the following steps: firstly, preparing graphene oxide; further comprising:
s104, under the condition of external ventilation, adding 150mL of distilled water into the mixed solution, preserving heat at 90 ℃, and continuously stirring for at least 15min by using a magnetic stirrer; after the mixed solution is cooled, removing insoluble substances through centrifugal treatment;
s105, introducing the oxidized graphite-containing liquid into distilled water, and diluting the reactant; adding 15mL of hydrogen peroxide with the concentration of 30% into the mixed solution, and stirring while adding until all the hydrogen peroxide is added.
4. The preparation method of the anticorrosive paint applied to the bridge steel structure according to claim 3, characterized by comprising the following steps: s106 is also existed after S105, the mixed solution is stood at room temperature until graphite oxide is precipitated at the bottom of the beaker, and supernatant is absorbed under the condition of keeping the liquid level stable;
centrifuging the remaining precipitate with 10% HF and distilled water alternately, drying the centrifuged product, and preparing graphene oxide; the fineness of the graphite powder is 7000 meshes.
5. The preparation method of the anticorrosive paint applied to the bridge steel structure according to claim 1, characterized in that: step two, preparing modified Al 2 O 3 ·SiO 2 A material, comprising:
s201, cleaning Al 2 O 3 ·SiO 2 : measuring acetone solution, and adding Al 2 O 3 ·SiO 2 Performing ultrasonic dispersion on the particles for 30min, then alternately centrifuging by removing distilled water and absolute ethyl alcohol, and finally drying the obtained product in an oven to remove contained liquid;
s202, hydrolyzing a silane coupling agent kh 560: putting a silane coupling agent kh560 and absolute ethyl alcohol into a three-neck flask, uniformly stirring and mixing, slowly dripping distilled water, stirring at the rotating speed of 350r/min, and hydrolyzing for 45min until the pH is about = 10;
mixing Al 2 O 3 ·SiO 2 Adding the powder into the mixture, continuously stirring for at least 90min, washing with distilled water and anhydrous ethanol in sequence, centrifuging, placing the precipitate into an oven, adjusting to 60 deg.C, drying, taking out, and grinding to obtain silane coupling agent kh560 modified Al 2 O 3 ·SiO 2 。
6. The preparation method of the anticorrosive paint applied to the bridge steel structure according to claim 1, characterized in that: step three, preparing the corrosion-resistant coating:
s301, adding distilled water and an emulsifier into a container, and ultrasonically dispersing 20-60 parts by mass of epoxy resin, 4-6 parts by mass of zinc powder, 0.3-0.5 part by mass of a dispersant and 20-30 parts by mass of xylene for 20min under high-speed stirring to form a pre-emulsion B;
s302, sequentially adding distilled water and an emulsifier into a four-mouth bottle, adding 30-50 parts by mass of n-butyl alcohol and 20-30 parts by mass of polyester resin under high-speed stirring, and heating to 80 ℃ to form a pre-emulsion A.
7. The preparation method of the anticorrosive paint applied to the bridge steel structure according to claim 1, characterized in that: step three, preparing the corrosion-resistant coating: also comprises
S303, adding 5-10% by mass of pre-emulsion A and 30-40% by mass of initiator solution into a reaction kettle, and then sequentially adding 4-6 parts by mass of thickening agent and graphene oxide, and modified Al 2 O 3 ·SiO 2 10 to 15 parts; maintaining the temperature at 85 deg.C, stirring at high speed for 15min to form mixed solution; s304, adding the residual pre-emulsion A and part of initiator solution into the mixed solution, and keeping the temperature for at least 60min; and after the heat preservation is finished, adding the pre-emulsion B and the residual initiator solution into the mixed solution, and preserving the heat for 60 to 120min to form an AB mixed solution.
8. The preparation method of the anticorrosive paint applied to the bridge steel structure according to claim 7, characterized in that: after S304 also exist
S305, cooling to 60-70 ℃, and centrifuging the AB mixed solution at constant temperature to eliminate unreacted residues; cooling to 45 ℃, and adding 0.2 to 0.3 part by mass of defoaming agent and 0.2 to 0.3 part by mass of Si 3 N 4 1 to 3 parts of particle filler, mixing at high speed, and filtering insoluble substances;
s306, adding 10-15 parts by mass of synthetic resin curing agent into a reaction container, and dispersing at high speed for 10min to obtain the anticorrosive paint.
9. An anticorrosion coating prepared by the method of any one of claims 1 to 8, wherein: the anticorrosive coating is applied to an anticorrosive coating of a bridge steel structure, and at least comprises the following components in parts by mass: xylene: 20 to 30; dispersing agent: 0.3 to 0.5; defoaming agent: 0.2 to 0.3; zinc powder: 4 to 6; 4 to 6 of graphene oxide; epoxy resin: 20 to 60; n-butanol: 30 to 50; curing agent: 10 to 15; 20-30 parts of polyester resin; modified Al 2 O 3 ·SiO 2 10~15。
10. The utility model provides a be applied to anticorrosive coating structure of bridge steel construction which characterized in that: the anticorrosive coating structure is prepared by the following method, including:
degreasing the surface of the steel structure by using acetone, and cleaning the surface by using ethanol;
spraying the anticorrosive paint in the claim 9 on a steel structure with a clean surface by using spraying equipment, keeping the spraying distance of 25-30cm and the spraying pressure of 0.5MPa, wherein the thickness of a coating film is 100-150 μm;
and (5) ventilating and drying for 2h at room temperature to form an anticorrosive coating structure.
CN202211169685.3A 2022-09-26 2022-09-26 Coating structure with anti-corrosion function for bridge steel structure Pending CN115247019A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116333572A (en) * 2023-03-06 2023-06-27 苏州皇冠涂料科技发展有限公司 Corrosion-resistant coating and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116333572A (en) * 2023-03-06 2023-06-27 苏州皇冠涂料科技发展有限公司 Corrosion-resistant coating and preparation method thereof

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