CN111205734A - Graphene-based corrosion-resistant coating and production process thereof - Google Patents
Graphene-based corrosion-resistant coating and production process thereof Download PDFInfo
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- CN111205734A CN111205734A CN202010127352.9A CN202010127352A CN111205734A CN 111205734 A CN111205734 A CN 111205734A CN 202010127352 A CN202010127352 A CN 202010127352A CN 111205734 A CN111205734 A CN 111205734A
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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
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- 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
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a graphene-based corrosion-resistant coating and a production process thereof, wherein the graphene-based corrosion-resistant coating is prepared from the following raw materials in parts by mass: 90-120 parts of Epoxy resin, 22.5-30 parts of polypyrrole, 8-15 parts of graphene, 12-18 parts of diatomite, 5-8 parts of talcum powder, 3-5 parts of defoaming agent, 8-15 parts of dispersing agent, 2-4 parts of flatting agent, 1-3 parts of curing agent and 1.2-1.5 mL/g Epoxy solvent; the production process of the graphene-based corrosion-resistant coating comprises the following preparation steps: preparing a mixed auxiliary agent, preparing a graphene dispersion liquid and preparing the graphene-based corrosion-resistant coating. The graphene modified epoxy resin coating prepared by the invention increases the compactness of the coating section, improves the corrosion-resistant and high-protection performance of the coating, generates a passivation layer on the surface of the coating in the coating soaking process to realize the protection of a matrix, and improves the heat resistance and impact resistance of the epoxy resin coating.
Description
Technical Field
The invention relates to the technical field of corrosion-resistant coatings, in particular to a graphene-based corrosion-resistant coating and a production process thereof.
Background
Graphene, which is the thinnest two-dimensional material known at present and has excellent physicochemical properties, is a single-layer graphite sheet with SP between carbon atoms2The hybrid mode forms a common electron pair, and is a novel carbon material with a two-dimensional structure. The thickness of which is only the diameter of carbon atoms0.335nm, the graphene has a benzene six-membered ring structure, and the atomic arrangement density is low, so that the graphene has the characteristics of low density and light weight. In addition, graphene has been extensively validated for its unique properties, such as high surface area, green, permeability, etc., to be used as a functional filler to improve the corrosion resistance of the coating, while its inorganic character improves the compatibility of the coating with the substrate.
Epoxy resins are currently the most commonly used of the many coatings, and can be cured with suitable curing agents to provide cured polymers with desirable properties, such as high flexibility and good corrosion resistance, particularly to moisture and chemicals, due to their long hydrophobic chains, however, epoxy resins suffer from certain drawbacks, such as poor compactness, low toughness, poor heat and impact resistance. Therefore, the graphene modified epoxy resin coating provided by the invention increases the density of the coating section, and after a long-acting soaking test, the coating shows a more corrected corrosion potential, a lower corrosion current density and a higher impedance modulus value, so that the corrosion resistance and high protection performance of the coating are improved, and a passivation layer is generated on the surface of the coating in the soaking process of the coating to protect a matrix, and meanwhile, the heat resistance and impact resistance of the epoxy resin coating are improved.
Disclosure of Invention
In order to solve the problems in the prior art, improve the corrosion resistance and the protective performance of the coating and improve the heat resistance and the impact resistance of the coating, the invention provides the graphene-based corrosion-resistant coating and a production process thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the graphene-based corrosion-resistant coating is prepared from the following raw materials in parts by mass:
the production process of the graphene-based corrosion-resistant coating comprises the following preparation steps:
step one, preparing a mixed auxiliary agent: mixing and stirring the diatomite, the talcum powder, the defoaming agent, the dispersing agent and the flatting agent by using a high-speed shearing stirring device, wherein the stirring conditions are as follows: the temperature is 30-35 ℃, the stirring speed is 2000-4000 r/min, and the stirring time is 30-40 min, so that the mixed auxiliary agent is prepared;
step two, preparing a graphene dispersion liquid: weighing the graphene and the polypyrrole in parts by mass, adding the graphene and the polypyrrole into a certain amount of mixed solvent of deionized water and ethanol, and performing ultrasonic dispersion for 30-40 min to obtain a graphene dispersion liquid with relatively uniform dispersion;
step three, preparing the graphene-based corrosion-resistant coating: and slowly doping the graphene dispersion liquid and the mixed auxiliary agent into epoxy resin, uniformly stirring for 1.5-2.5 h, removing the solvent ethanol in the mixture by using a rotary evaporator, adding the curing agent into the compound, stirring, removing bubbles in the compound by using a vacuum drying oven, and thus obtaining the required graphene-based corrosion-resistant coating, wherein the coating can be applied by using a bar coater.
According to the graphene-based corrosion-resistant coating and the production process thereof, the solvent is a mixed liquid of deionized water and ethanol, and the volume ratio of the deionized water to the ethanol is 1: 2-1: 1.
According to the graphene-based corrosion-resistant coating and the production process thereof, the defoaming agent is a polyether modified silicon defoaming agent.
According to the graphene-based corrosion-resistant coating and the production process thereof, the dispersing agent is one of sodium polyacrylate, propyl trimethoxy silane and butyl acetate cellulose.
According to the graphene-based corrosion-resistant coating and the production process thereof, the flatting agent is one of hydroxymethyl cellulose and butyl cellulose.
According to the graphene-based corrosion-resistant coating and the production process thereof, the curing agent is an aliphatic amine curing agent or an alicyclic amine curing agent.
Compared with the prior art, the invention provides the following beneficial effects:
the graphene modified epoxy resin coating prepared by the invention increases the compactness of the coating section, and after the coating is subjected to a long-acting soaking test, the coating shows a more corrected corrosion potential, a lower corrosion current density and a higher impedance modulus value, the corrosion resistance and high protection performance of the coating are improved, and a passivation layer can be generated on the surface of the coating in the coating soaking process to protect a matrix, and meanwhile, the heat resistance and impact resistance of the epoxy resin coating are improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is an electron micrograph of the graphene dispersion prepared in example 3 of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[ example 1 ]
The graphene-based corrosion-resistant coating is prepared from the following raw materials in parts by mass:
the production process of the graphene-based corrosion-resistant coating comprises the following preparation steps:
step one, preparing a mixed auxiliary agent: mixing and stirring the diatomite, the talcum powder, the defoaming agent, the dispersing agent and the flatting agent by using a high-speed shearing stirring device, wherein the stirring conditions are as follows: the temperature is 30 ℃, the stirring speed is 4000r/min, and the stirring time is 30min, so that the mixed auxiliary agent is prepared;
step two, preparing a graphene dispersion liquid: weighing the graphene and the polypyrrole in parts by mass, adding the graphene and the polypyrrole into a certain amount of mixed solvent of deionized water and ethanol, and performing ultrasonic dispersion for 30min to obtain a graphene dispersion liquid with relatively uniform dispersion;
step three, preparing the graphene-based corrosion-resistant coating: and (2) slowly doping the graphene dispersion liquid and the mixed auxiliary agent into epoxy resin, uniformly stirring for 1.5h, removing the solvent ethanol in the mixture by using a rotary evaporator, adding the curing agent into the compound, stirring, removing bubbles in the compound by using a vacuum drying oven, and obtaining the required graphene-based corrosion-resistant coating, wherein the coating can be applied by using a bar coater.
Further, the solvent is a mixed liquid of deionized water and ethanol, and the volume ratio of the deionized water to the ethanol is 1: 2.
Further, the defoaming agent is a polyether modified silicon defoaming agent.
Further, the dispersing agent is sodium polyacrylate.
Further, the leveling agent is hydroxymethyl cellulose.
Further, the curing agent is a fatty amine curing agent.
[ example 2 ]
The graphene-based corrosion-resistant coating is prepared from the following raw materials in parts by mass:
the production process of the graphene-based corrosion-resistant coating comprises the following preparation steps:
step one, preparing a mixed auxiliary agent: mixing and stirring the diatomite, the talcum powder, the defoaming agent, the dispersing agent and the flatting agent by using a high-speed shearing stirring device, wherein the stirring conditions are as follows: the temperature is 32 ℃, the stirring speed is 2500r/min, and the stirring time is 38min, so as to prepare the mixed auxiliary agent;
step two, preparing a graphene dispersion liquid: weighing the graphene and the polypyrrole in parts by mass, adding the graphene and the polypyrrole into a certain amount of mixed solvent of deionized water and ethanol, and ultrasonically dispersing for 34min to obtain a graphene dispersion liquid with relatively uniform dispersion;
step three, preparing the graphene-based corrosion-resistant coating: and (2) slowly doping the graphene dispersion liquid and the mixed auxiliary agent into epoxy resin, uniformly stirring for 1.8h, removing the solvent ethanol in the mixture by using a rotary evaporator, adding the curing agent into the compound, stirring, removing bubbles in the compound by using a vacuum drying oven, and obtaining the required graphene-based corrosion-resistant coating, wherein the coating can be applied by using a bar coater.
Further, the solvent is a mixed liquid of deionized water and ethanol, and the volume ratio of the deionized water to the ethanol is 1: 1.4.
Further, the defoaming agent is a polyether modified silicon defoaming agent.
Further, the dispersing agent is propyl trimethoxy silane.
Further, the leveling agent is butyl cellulose.
Further, the curing agent is alicyclic amine curing agent.
[ example 3 ]
The graphene-based corrosion-resistant coating is prepared from the following raw materials in parts by mass:
the production process of the graphene-based corrosion-resistant coating comprises the following preparation steps:
step one, preparing a mixed auxiliary agent: mixing and stirring the diatomite, the talcum powder, the defoaming agent, the dispersing agent and the flatting agent by using a high-speed shearing stirring device, wherein the stirring conditions are as follows: the temperature is 34 ℃, the stirring speed is 3500r/min, the stirring time is 25min, and the mixed auxiliary agent is prepared;
step two, preparing a graphene dispersion liquid: weighing the graphene and the polypyrrole in parts by mass, adding the graphene and the polypyrrole into a certain amount of mixed solvent of deionized water and ethanol, and ultrasonically dispersing for 35min to obtain a graphene dispersion liquid with relatively uniform dispersion;
step three, preparing the graphene-based corrosion-resistant coating: and (3) slowly doping the graphene dispersion liquid and the mixed auxiliary agent into epoxy resin, uniformly stirring for 2h, removing the solvent ethanol in the mixture by using a rotary evaporator, adding the curing agent into the compound, stirring, removing bubbles in the compound by using a vacuum drying oven, and obtaining the required graphene-based corrosion-resistant coating, wherein the required graphene-based corrosion-resistant coating can be obtained by only using a rod coater for coating when in use.
Further, the solvent is a mixed liquid of deionized water and ethanol, and the volume ratio of the deionized water to the ethanol is 1: 1.2.
Further, the defoaming agent is a polyether modified silicon defoaming agent.
Further, the dispersing agent is propyl trimethoxy silane.
Further, the leveling agent is butyl cellulose.
Further, the curing agent is alicyclic amine curing agent.
[ example 4 ]
The graphene-based corrosion-resistant coating is prepared from the following raw materials in parts by mass:
the production process of the graphene-based corrosion-resistant coating comprises the following preparation steps:
step one, preparing a mixed auxiliary agent: mixing and stirring the diatomite, the talcum powder, the defoaming agent, the dispersing agent and the flatting agent by using a high-speed shearing stirring device, wherein the stirring conditions are as follows: the temperature is 35 ℃, the stirring speed is 4000r/min, and the stirring time is 30min, so as to prepare the mixed auxiliary agent;
step two, preparing a graphene dispersion liquid: weighing the graphene and the polypyrrole in parts by mass, adding the graphene and the polypyrrole into a certain amount of mixed solvent of deionized water and ethanol, and ultrasonically dispersing for 40min to obtain a graphene dispersion liquid with relatively uniform dispersion;
step three, preparing the graphene-based corrosion-resistant coating: and (3) slowly doping the graphene dispersion liquid and the mixed auxiliary agent into epoxy resin, uniformly stirring for 2.5h, removing the solvent ethanol in the mixture by using a rotary evaporator, adding the curing agent into the compound, stirring, removing bubbles in the compound by using a vacuum drying oven, and obtaining the required graphene-based corrosion-resistant coating, wherein the coating can be applied by using a bar coater.
Further, the solvent is a mixed liquid of deionized water and ethanol, and the volume ratio of the deionized water to the ethanol is 1:1.
Further, the defoaming agent is a polyether modified silicon defoaming agent.
Further, the dispersing agent is butyl acetate cellulose.
Further, the leveling agent is hydroxymethyl cellulose.
Further, the curing agent is a fatty amine curing agent.
The mechanical properties of the coating film are measured according to national standards, the performance characterization of the coating film is carried out on the above examples 1-4, and the results of the test data are shown in the following table 1.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
TABLE 1 Performance characterization data Table for each coating film in examples 1 to 4
| Film coating performance | Hardness of pencil | Adhesion force | Impact strength (cm) | Elasticity (m/m steel bar) |
| Example 1 | 6H | Superior food | 58 | 0.7 |
| Example 2 | 7H | Superior food | 60 | 0.6 |
| Example 3 | 7H | Superior food | 64 | 0.6 |
| Example 4 | 6H | Superior food | 60 | 0.7 |
Claims (6)
1. The graphene-based corrosion-resistant coating is characterized by being prepared from the following raw materials in parts by mass:
the production process of the graphene-based corrosion-resistant coating comprises the following preparation steps:
step one, preparing a mixed auxiliary agent: mixing and stirring the diatomite, the talcum powder, the defoaming agent, the dispersing agent and the flatting agent by using a high-speed shearing stirring device, wherein the stirring conditions are as follows: the temperature is 30-35 ℃, the stirring speed is 2000-4000 r/min, and the stirring time is 30-40 min, so that the mixed auxiliary agent is prepared;
step two, preparing a graphene dispersion liquid: weighing the graphene and the polypyrrole in parts by mass, adding the graphene and the polypyrrole into a certain amount of mixed solvent of deionized water and ethanol, and performing ultrasonic dispersion for 30-40 min to obtain a graphene dispersion liquid with relatively uniform dispersion;
step three, preparing the graphene-based corrosion-resistant coating: and slowly doping the graphene dispersion liquid and the mixed auxiliary agent into epoxy resin, uniformly stirring for 1.5-2.5 h, removing the solvent ethanol in the mixture by using a rotary evaporator, adding the curing agent into the compound, stirring, removing bubbles in the compound by using a vacuum drying oven, and thus obtaining the required graphene-based corrosion-resistant coating, wherein the coating can be applied by using a bar coater.
2. The graphene-based corrosion-resistant coating and the production process thereof as claimed in claim 1, wherein the solvent is a mixed liquid of deionized water and ethanol, and the volume ratio of the deionized water to the ethanol is 1: 2-1: 1.
3. The graphene-based corrosion-resistant coating and the production process thereof as claimed in claim 1, wherein the defoaming agent is a polyether modified silicon defoaming agent.
4. The graphene-based corrosion-resistant coating and the production process thereof as claimed in claim 1, wherein the dispersant is one of sodium polyacrylate, propyl trimethoxy silane and butyl acetate cellulose.
5. The graphene-based corrosion-resistant coating and the production process thereof as claimed in claim 1, wherein the leveling agent is one of hydroxymethyl cellulose and butyl cellulose.
6. The graphene-based corrosion-resistant coating and the production process thereof as claimed in claim 1, wherein the curing agent is aliphatic amine curing agent or alicyclic amine curing agent.
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Cited By (2)
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| CN114525051A (en) * | 2021-12-31 | 2022-05-24 | 镇江银海镍铬化工有限公司 | Anticorrosive conductive coating and preparation method thereof |
| CN114958137A (en) * | 2021-02-24 | 2022-08-30 | 南亚塑胶工业股份有限公司 | Environment-friendly anticorrosive paint and preparation method thereof |
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Application publication date: 20200529 |