CN116239935B - Solvent-free self-repairing anticorrosive paint based on lithium salt and preparation and use methods thereof - Google Patents
Solvent-free self-repairing anticorrosive paint based on lithium salt and preparation and use methods thereof Download PDFInfo
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- CN116239935B CN116239935B CN202310246808.7A CN202310246808A CN116239935B CN 116239935 B CN116239935 B CN 116239935B CN 202310246808 A CN202310246808 A CN 202310246808A CN 116239935 B CN116239935 B CN 116239935B
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- 239000003973 paint Substances 0.000 title claims abstract description 57
- 229910003002 lithium salt Inorganic materials 0.000 title claims abstract description 47
- 159000000002 lithium salts Chemical class 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000005260 corrosion Methods 0.000 claims abstract description 27
- 230000007797 corrosion Effects 0.000 claims abstract description 24
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 21
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 21
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000012964 benzotriazole Substances 0.000 claims abstract description 16
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 15
- 150000001412 amines Chemical class 0.000 claims abstract description 15
- 229920000570 polyether Polymers 0.000 claims abstract description 15
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 13
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003112 inhibitor Substances 0.000 claims abstract description 12
- 239000013530 defoamer Substances 0.000 claims abstract description 11
- 239000003085 diluting agent Substances 0.000 claims abstract description 10
- 239000003822 epoxy resin Substances 0.000 claims abstract description 9
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 9
- UWFRVQVNYNPBEF-UHFFFAOYSA-N 1-(2,4-dimethylphenyl)propan-1-one Chemical group CCC(=O)C1=CC=C(C)C=C1C UWFRVQVNYNPBEF-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910000547 2024-T3 aluminium alloy Inorganic materials 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 14
- 239000011259 mixed solution Substances 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 9
- 239000004842 bisphenol F epoxy resin Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 7
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000011859 microparticle Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002105 nanoparticle Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 46
- 239000011248 coating agent Substances 0.000 abstract description 39
- 230000000694 effects Effects 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 235000010215 titanium dioxide Nutrition 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 21
- 150000003839 salts Chemical class 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 239000012855 volatile organic compound Substances 0.000 description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- CUGZWHZWSVUSBE-UHFFFAOYSA-N 2-(oxiran-2-ylmethoxy)ethanol Chemical compound OCCOCC1CO1 CUGZWHZWSVUSBE-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000001453 impedance spectrum Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 239000012633 leachable Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- NVKTUNLPFJHLCG-UHFFFAOYSA-N strontium chromate Chemical compound [Sr+2].[O-][Cr]([O-])(=O)=O NVKTUNLPFJHLCG-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
- C09D7/63—Additives non-macromolecular organic
-
- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/262—Alkali metal carbonates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a solvent-free self-repairing anticorrosive paint based on lithium salt and a preparation and use method thereof, belonging to the field of metal anticorrosive coatings, wherein the paint is prepared from a component one and a component two; the component one comprises low-viscosity epoxy resin, reactive diluent, corrosion inhibitor, rutile titanium white, talcum powder, defoamer and silane coupling agent; the reactive diluent is ethylene glycol diglycidyl ether; the corrosion inhibitor comprises lithium carbonate and benzotriazole; the second component is polyether amine curing agent. The invention has simple preparation process, strong operability, environmental protection, good corrosion resistance and self-repairing effect, and effectively prolongs the service life of the coating.
Description
Technical Field
The invention belongs to the field of metal anti-corrosion coatings, relates to a self-repairing anti-corrosion coating, and particularly relates to a solvent-free self-repairing anti-corrosion coating based on lithium salt and a preparation method and a use method thereof.
Background
The epoxy anticorrosive paint has the advantages of compact paint film structure, strong adhesive force, high mechanical strength, good corrosion resistance and the like, and is widely applied to the industrial anticorrosive field. With the increase of the usage amount, the epoxy anticorrosive paint can face two common problems in the use process. Firstly, the traditional solvent-based epoxy paint can release a large amount of Volatile Organic Compounds (VOC) in the process of manufacturing, coating and crosslinking curing, so that serious pollution is caused to the ecological environment; secondly, the coating is damaged due to the influence of external environment in the service process after being solidified into a film, so that the service life of the coating is shortened, and if the coating is repaired or replaced manually, the cost is greatly increased. Aiming at the problems, the solvent-free self-repairing epoxy anticorrosive paint is an effective solving way.
In general, the direct incorporation of corrosion inhibitors as repair agents into a coating is the simplest and feasible design concept for achieving self-repair effects. For example, early self-repairing anticorrosive paint has improved anticorrosive performance and self-repairing effect by adding strontium chromate, but chromate is toxic and carcinogenic, so that it is highly required to find a 'green' self-repairing corrosion inhibitor for replacing chromate.
For example, the invention patent application with publication number of CN114752295A discloses a polyurethane anticorrosive paint, which uses lithium carbonate as a corrosion inhibitor to enhance the corrosion resistance of the coating, but the corrosion resistance of the lithium carbonate is limited, and a large amount of volatile organic solvents have serious environmental pollution.
Therefore, there is a need for a solvent-free self-healing anticorrosive paint with simple process and excellent self-healing properties.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the solvent-free self-repairing anticorrosive paint based on lithium salt and the preparation and use methods thereof.
In order to achieve the above object, the present invention provides a solvent-free self-repairing anticorrosive paint based on lithium salt, which has the following characteristics: the coating is prepared from a first component and a second component; the component one comprises low-viscosity epoxy resin, reactive diluent, corrosion inhibitor, rutile titanium white, talcum powder, defoamer and silane coupling agent; the reactive diluent is ethylene glycol diglycidyl ether; the corrosion inhibitor comprises lithium carbonate and benzotriazole; the second component is polyether amine curing agent.
Further, the invention provides a solvent-free self-repairing anticorrosive paint based on lithium salt, which can also have the following characteristics: wherein the low-viscosity epoxy resin is bisphenol F epoxy resin NPEF-170.
Further, the invention provides a solvent-free self-repairing anticorrosive paint based on lithium salt, which can also have the following characteristics: wherein the weight portions of the components are as follows: 40-60 parts of viscosity epoxy resin, 8-10 parts of reactive diluent, 15-20 parts of corrosion inhibitor, 3-6 parts of rutile titanium dioxide, 5-10 parts of talcum powder, 0.5-2 parts of defoamer, 0.5-2 parts of silane coupling agent and 15-25 parts of polyether amine curing agent.
Further, the invention provides a solvent-free self-repairing anticorrosive paint based on lithium salt, which can also have the following characteristics: wherein, in the corrosion inhibitor, the mass ratio of the lithium carbonate to the benzotriazole is 10-15:5-10.
Further, the invention provides a solvent-free self-repairing anticorrosive paint based on lithium salt, which can also have the following characteristics: wherein the polyether amine curing agent is polyether amine D230.
Further, the invention provides a solvent-free self-repairing anticorrosive paint based on lithium salt, which can also have the following characteristics: wherein, the rutile titanium dioxide and talcum powder are micro/nano particles.
Further, the invention provides a solvent-free self-repairing anticorrosive paint based on lithium salt, which can also have the following characteristics: wherein the defoamer is BYK-A530.
Further, the invention provides a solvent-free self-repairing anticorrosive paint based on lithium salt, which can also have the following characteristics: wherein the silane coupling agent is KH-550.
The invention also provides a preparation method of the solvent-free self-repairing anticorrosive paint based on lithium salt, which has the following characteristics: the method comprises the following steps: adding lithium carbonate, benzotriazole, rutile titanium dioxide, talcum powder, a defoaming agent and a silane coupling agent into low-viscosity epoxy resin, and uniformly stirring and mixing; step two, adding a reactive diluent into the mixed solution obtained in the step one, and adjusting the viscosity (the proper viscosity range is 1500-2000 (cps/25 ℃); and thirdly, adding a polyether amine curing agent into the mixed solution obtained in the second step, and stirring and dispersing uniformly to obtain the solvent-free self-repairing anticorrosive paint based on lithium salt.
The invention also provides a preparation method of the solvent-free self-repairing anticorrosive paint based on lithium salt, which has the following characteristics: spraying the solvent-free self-repairing anticorrosive paint based on lithium salt on the pretreated 2024-T3 aluminum alloy, and drying and curing at room temperature to form the solvent-free self-repairing anticorrosive paint based on lithium salt.
The invention has the beneficial effects that: the invention adopts the mixture of lithium carbonate and benzotriazole as leachable corrosion inhibitor to be added into the epoxy resin coating, and the prepared coating has good self-repairing performance on 2024-T3 aluminum alloy. The synergistic effect of the benzotriazole and the lithium carbonate is added on the basis of the lithium carbonate corrosion inhibition effect, so that the corrosion resistance and the self-repairing performance of the coating are further enhanced. When the coating is damaged, the aluminum alloy matrix is corroded, lithium carbonate in the coating is leached out to the scratch position at first due to the fast leaching rate and reacts with the matrix to form a layer of main body protection film, the leaching rate of benzotriazole is slow, and the leached benzotriazole is adsorbed on the surface of the main body protection film, so that further corrosion of the matrix can be effectively inhibited, and a self-repairing effect is achieved. Specifically, lithium carbonate is leached out to the surface of a matrix at first, reacts with an aluminum matrix to form a Layered Double Hydroxide (LDH) main body film, and is leached out to the surface of the LDH film after benzotriazole, and intercalation enters the LDH and is adsorbed on the porous surface of the LDH, so that the film is more compact, and the corrosion resistance and self-repairing performance of the coating are further enhanced.
In addition, the invention selects the bisphenol F epoxy resin with low viscosity as a film forming substance of the paint, and the ethylene glycol glycidyl ether is used as a reactive diluent to adjust the viscosity of the paint, so that the solid content is close to 100 percent, no volatile organic compound is discharged in the coating and curing processes, and the paint is very environment-friendly.
Drawings
FIG. 1 is a scanning electron micrograph of the coating of example 1 at 168 hours after salt spray scoring;
FIG. 2 is a scanning electron micrograph of the coating of comparative example 1 at the scratch after 168 hours of salt spray after the scratch was made;
FIG. 3 is a scanning electron micrograph of the coating of comparative example 2 at the scratch after 168 hours of salt spray after the scratch was made; fig. 4 shows ac impedance spectra of the coatings of example 1, comparative example 1 and comparative example 2 after salt spray 168 hours after scoring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to specific embodiments.
Example 1
The embodiment provides a solvent-free self-repairing anticorrosive paint based on lithium salt, and the preparation method comprises the following steps:
step one, 60g of bisphenol F epoxy resin NPEF-170, 11.5g of lithium carbonate, 7.4g of benzotriazole, 4.5g of rutile titanium dioxide, 8.8g of talcum powder, 1.2g of defoamer BYK-A530 and 1.2g of silane coupling agent KH-550 are weighed and placed in a beaker, and stirred on a magnetic stirrer for 24 hours to be uniformly mixed.
And step two, adding 10g of ethylene glycol diglycidyl ether into the mixed solution obtained in the step one, and adjusting to a proper viscosity.
And step three, adding 25.0g of curing agent polyether amine D230 into the mixed solution obtained in the step two, and stirring and dispersing uniformly to obtain the solvent-free self-repairing anticorrosive paint based on lithium salt.
The application method of the solvent-free self-repairing anticorrosive paint based on lithium salt comprises the following steps: spraying the solvent-free self-repairing anticorrosive paint based on lithium salt on the pretreated 2024-T3 aluminum alloy, and then placing the 2024-T3 aluminum alloy sprayed with the coating in a constant-temperature oven at 25 ℃ for curing for 24 hours to obtain the solvent-free self-repairing anticorrosive paint based on lithium salt.
Example 2
The embodiment provides a solvent-free self-repairing anticorrosive paint based on lithium salt, and the preparation method comprises the following steps:
step one, 40g of bisphenol F epoxy resin NPEF-170, 10.0g of lithium carbonate, 5.0g of benzotriazole, 3.0g of rutile titanium dioxide, 5.0g of talcum powder, 0.5g of defoamer BYK-A530 and 0.5g of silane coupling agent KH-550 are weighed and placed in a beaker, and stirred on a magnetic stirrer for 24 hours to be uniformly mixed.
And step two, adding 8g of ethylene glycol diglycidyl ether into the mixed solution obtained in the step one, and adjusting to a proper viscosity.
And step three, adding 15.0g of curing agent polyether amine D230 into the mixed solution obtained in the step two, and stirring and dispersing uniformly to obtain the solvent-free self-repairing anticorrosive paint based on lithium salt.
The application method of the solvent-free self-repairing anticorrosive paint based on lithium salt comprises the following steps: spraying the solvent-free self-repairing anticorrosive paint based on lithium salt on the pretreated 2024-T3 aluminum alloy, and then placing the 2024-T3 aluminum alloy sprayed with the coating in a constant-temperature oven at 25 ℃ for curing for 24 hours to obtain the solvent-free self-repairing anticorrosive paint based on lithium salt.
Example 3
The embodiment provides a solvent-free self-repairing anticorrosive paint based on lithium salt, and the preparation method comprises the following steps:
step one, 50g of bisphenol F epoxy resin NPEF-170, 15.0g of lithium carbonate, 10.0g of benzotriazole, 6.0g of rutile titanium dioxide, 10.0g of talcum powder, 2.0g of defoamer BYK-A530 and 2.0g of silane coupling agent KH-550 are weighed and placed in a beaker, and stirred on a magnetic stirrer for 24 hours to be uniformly mixed.
And step two, adding 8g of ethylene glycol diglycidyl ether into the mixed solution obtained in the step one, and adjusting to a proper viscosity.
And step three, adding 20.0g of curing agent polyether amine D230 into the mixed solution obtained in the step two, and stirring and dispersing uniformly to obtain the solvent-free self-repairing anticorrosive paint based on lithium salt.
The application method of the solvent-free self-repairing anticorrosive paint based on lithium salt comprises the following steps: spraying the solvent-free self-repairing anticorrosive paint based on lithium salt on the pretreated 2024-T3 aluminum alloy, and then placing the 2024-T3 aluminum alloy sprayed with the coating in a constant-temperature oven at 25 ℃ for curing for 24 hours to obtain the solvent-free self-repairing anticorrosive paint based on lithium salt.
Comparative example 1
The comparative example provides a coating, the preparation method of which comprises the following steps:
step one, 60g of bisphenol F epoxy resin NPEF-170, 11.5g of lithium carbonate, 4.5g of rutile titanium dioxide, 8.8g of talcum powder, 1.2g of defoamer BYK-A530 and 1.2g of silane coupling agent KH-550 are weighed, placed in a beaker, and stirred on a magnetic stirrer for 24 hours to be uniformly mixed.
And step two, adding 10g of ethylene glycol diglycidyl ether into the mixed solution obtained in the step one, and adjusting to a proper viscosity.
And step three, adding 25.0g of curing agent polyether amine D230 into the mixed solution obtained in the step two, and stirring and dispersing uniformly to obtain the coating.
The application method of the coating comprises the following steps: spraying the solvent-free self-repairing anticorrosive paint based on lithium salt on the pretreated 2024-T3 aluminum alloy, and then placing the 2024-T3 aluminum alloy sprayed with the coating in a constant-temperature oven with the temperature of 25 ℃ for curing for 24 hours to obtain the coating.
Comparative example 2
The comparative example provides a coating, the preparation method of which comprises the following steps:
step one, 60g of bisphenol F epoxy resin NPEF-170, 4.5g of rutile titanium dioxide, 8.8g of talcum powder, 1.2g of defoamer BYK-A530 and 1.2g of silane coupling agent KH-550 are weighed, placed in a beaker, and stirred on a magnetic stirrer for 24 hours to be uniformly mixed.
And step two, adding 10g of ethylene glycol diglycidyl ether into the mixed solution obtained in the step one, and adjusting to a proper viscosity.
And step three, adding 25.0g of curing agent polyether amine D230 into the mixed solution obtained in the step two, and stirring and dispersing uniformly to obtain the coating.
The application method of the coating comprises the following steps: spraying the solvent-free self-repairing anticorrosive paint based on lithium salt on the pretreated 2024-T3 aluminum alloy, and then placing the 2024-T3 aluminum alloy sprayed with the coating in a constant-temperature oven with the temperature of 25 ℃ for curing for 24 hours to obtain the coating.
The coatings of example 1, comparative example 1 and comparative example 2 were subjected to a self-repairing corrosion-preventing test, and specifically, the coatings of example 1, comparative example 1 and comparative example 2 were each scored with the same scratches, and then each was subjected to a 168 hour neutral salt spray test, and the results are shown in fig. 1 to 4.
Among them, fig. 1 to 3 are SEM photographs of the scratch points of the coatings of example 1, comparative example 1 and comparative example 2, respectively, after 168 hours of neutral salt spray test under the condition of the engraved scratch and the damage of the coating. It can be seen from the figure that the lithium carbonate in the coating of example 1 and comparative example 1 leaches to the scratch to form a protective film with a flaky surface after 168 hours of neutral salt spray test, which prevents further corrosion of the substrate, while severe corrosion cracking occurs at the scratch of comparative example 2.
Fig. 4 is the results of electrochemical tests performed on the coatings of example 1, comparative example 1 and comparative example 2, and it can be seen from the figure that the scratch area resistance is higher and the corrosion resistance is more excellent after lithium carbonate is added in the coating of comparative example 1 compared with comparative example 2, while the resistance is higher in example 1 compared with comparative example 1, and the corrosion inhibition effect of lithium carbonate is further enhanced by benzotriazole added in the coating.
The morphology and the electrochemical results show that the self-repairing anticorrosive coating formed by the solvent-free self-repairing anticorrosive coating based on lithium salt has excellent anticorrosive performance and long-acting protection on 2024-T3 aluminum alloy matrix.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (7)
1. A solvent-free self-repairing anticorrosive paint based on lithium salt is characterized in that:
the material comprises the following raw materials in parts by mass: 40-60 parts of low-viscosity epoxy resin, 8-10 parts of reactive diluent, 15-20 parts of corrosion inhibitor, 3-6 parts of rutile titanium dioxide, 5-10 parts of talcum powder, 0.5-2 parts of defoamer, 0.5-2 parts of silane coupling agent and 15-25 parts of polyether amine curing agent
The reactive diluent is ethylene glycol diglycidyl ether;
the corrosion inhibitor consists of lithium carbonate and benzotriazole; the mass ratio of the lithium carbonate to the benzotriazole is 10-15:5-10;
the preparation method of the solvent-free self-repairing anticorrosive paint based on lithium salt comprises the following steps:
adding lithium carbonate, benzotriazole, rutile titanium dioxide, talcum powder, a defoaming agent and a silane coupling agent into low-viscosity epoxy resin, and uniformly stirring and mixing;
step two, adding an active diluent into the mixed solution obtained in the step one, and adjusting the viscosity;
and thirdly, adding a polyether amine curing agent into the mixed solution obtained in the second step, and stirring and dispersing uniformly to obtain the solvent-free self-repairing anticorrosive paint based on lithium salt.
2. The lithium salt-based solvent-free self-healing anticorrosive paint according to claim 1, characterized in that:
wherein the low-viscosity epoxy resin is bisphenol F epoxy resin NPEF-170.
3. The lithium salt-based solvent-free self-healing anticorrosive paint according to claim 1, characterized in that:
wherein the polyether amine curing agent is polyether amine D230.
4. The lithium salt-based solvent-free self-healing anticorrosive paint according to claim 1, characterized in that:
wherein, the rutile titanium dioxide and talcum powder are micro/nano particles.
5. The lithium salt-based solvent-free self-healing anticorrosive paint according to claim 1, characterized in that:
wherein the defoamer is BYK-A530.
6. The lithium salt-based solvent-free self-healing anticorrosive paint according to claim 1, characterized in that:
wherein the silane coupling agent is KH-550.
7. The method of using a lithium salt-based solvent-free self-healing anticorrosive paint according to any one of claims 1 to 6, wherein:
spraying the solvent-free self-repairing anticorrosive paint based on lithium salt on the pretreated 2024-T3 aluminum alloy, and drying and curing at room temperature to form the solvent-free self-repairing anticorrosive paint based on lithium salt.
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