CN111995933B - Three-dimensional graphene water-based epoxy anticorrosive paint, and preparation method and application method thereof - Google Patents
Three-dimensional graphene water-based epoxy anticorrosive paint, and preparation method and application method thereof Download PDFInfo
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- CN111995933B CN111995933B CN202010951849.2A CN202010951849A CN111995933B CN 111995933 B CN111995933 B CN 111995933B CN 202010951849 A CN202010951849 A CN 202010951849A CN 111995933 B CN111995933 B CN 111995933B
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Images
Classifications
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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
-
- 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
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The application provides a three-dimensional graphene water-based epoxy anticorrosive paint, a preparation method and a use method thereof, and belongs to the technical field of anticorrosive paints. The three-dimensional graphene water-based epoxy anticorrosive paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1: 1-10: 1; the component A comprises the following components in parts by weight: 30-80 parts of water-based epoxy resin emulsion, 10-40 parts of first water component, 0.1-5 parts of spherical three-dimensional graphene powder and 2.4-13 parts of auxiliary agent. The component B comprises: 60-95 parts of a water-based epoxy resin curing agent and 5-30 parts of a second water component. The spherical three-dimensional graphene powder is added into the anticorrosive coating, so that the anticorrosive effect is better.
Description
Technical Field
The application relates to the technical field of anticorrosive coatings, in particular to a three-dimensional graphene water-based epoxy anticorrosive coating, a preparation method and a use method thereof.
Background
The water-based epoxy anticorrosive paint takes water as a dispersion medium, has the advantages of non-flammability, no toxicity, environmental friendliness and the like, and becomes one of the development trends of the paint industry. However, due to the technical limitation of the existing waterborne epoxy emulsion, the performance of the I-type epoxy emulsion is limited by an emulsifier in a curing agent, so that the water resistance is defective, the II-type epoxy emulsion is difficult to form a stable emulsion through emulsion polymerization, and the compactness of a paint film is reduced due to pores possibly existing in the paint film during film forming.
In the prior art, the problem of poor water resistance and corrosion resistance of a paint film of the water-based epoxy resin emulsion can be solved to a certain extent by adding the two-dimensional flaky graphene powder. However, the conventional flake graphene powder (two-dimensional graphene) is difficult to disperse in an aqueous medium and easy to agglomerate, so that the preparation and coating processes of the coating are complex, and the performance of the coating is reduced; and is specially treated before being added into the water-based epoxy anticorrosive paint; meanwhile, the addition of the flaky graphene powder easily causes various anisotropy of the coating, and the strength and bonding strength of the coating are reduced; in addition, a large amount of chemicals such as sulfuric acid, permanganate and the like are used in the preparation process, and a large amount of harmful waste liquid is generated, so that the environmental protection cost is increased.
Disclosure of Invention
The application aims to provide the three-dimensional graphene water-based epoxy anticorrosive paint, the preparation method and the use method thereof, and the spherical three-dimensional graphene powder is added, so that the performances such as corrosion resistance, stability and bonding fastness are improved.
In a first aspect, the application provides a three-dimensional graphene water-based epoxy anticorrosive paint which comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1: 1-10: 1. The component A comprises the following components in parts by weight: 30-80 parts of water-based epoxy resin emulsion, 10-40 parts of first water component, 0.1-5 parts of spherical three-dimensional graphene powder and 2.4-13 parts of auxiliary agent. The component B comprises: 60-95 parts of a water-based epoxy resin curing agent and 5-30 parts of a second water component.
Spherical three-dimensional graphite alkene powder adds in anticorrosive coating later on the dispersion more even, and the mutual lapped lamellar structure in spherical three-dimensional graphite alkene powder edge has improved the compactness of coating, can obtain the isolated layer of compactness, makes the micromolecule corrosive substance be difficult to pass through, plays the isolated effect of physics. After the coating is coated on a substrate, the bonding area of the spherical three-dimensional graphene powder and the substrate is large, the coating is isotropic, the mechanical strength and the interface bonding fastness of the coating can be effectively improved, and the acid and alkali resistance and the stability of the coating can be improved.
In some possible embodiments, the aqueous epoxy resin emulsion includes one or both of a sulfonic acid group modified anionic epoxy resin and a reactive emulsifier emulsified bisphenol a epoxy resin.
In some possible embodiments, the aqueous epoxy resin curing agent is a polyamine-epoxy addition modified curing agent or an aqueous polyamide curing agent.
In some possible embodiments, the auxiliary agent comprises 0.1-2 parts by weight of a defoaming agent, 0.1-2 parts by weight of a dispersing agent, 0.1-2 parts by weight of a wetting agent, 0.1-2 parts by weight of a thickening agent and 2-5 parts by weight of a film-forming auxiliary agent.
In some possible embodiments, the defoamer comprises one or more of a mineral oil type defoamer, a silicone type defoamer, and an acetylenic diol type defoamer; the wetting agent comprises one or two of alkyne diol surfactant and fluorocarbon surfactant; the dispersant comprises one or two of hydrophobic modified ammonium salt copolymer and glycidyl naphthalene sulfonate; the thickening agent comprises one or two of modified lithium magnesium montmorillonite and hydrophobic modified alkali swelling auxiliary agent; the film forming assistant comprises one or two of propylene glycol methyl ether and propylene glycol methyl ether acetate.
In some possible embodiments, the spherical three-dimensional graphene powder includes: the carbon nano-particles are growth substrates and vertical graphene sheets growing on the carbon nano-particles, the particle size of the carbon nano-particles is 100-300 nm, and the edge thickness of the graphene sheets is 1-3 atomic layers.
The graphene sheets grow on the carbon nanoparticles, are connected and fixed with each other to form the three-dimensional graphene powder with the spherical particle structure, show isotropy and have better interface bonding strength.
In some possible embodiments, a method for preparing a spherical three-dimensional graphene powder includes: taking carbon nano particles as a growth substrate, heating to above 1500 ℃ in an inert gas atmosphere, reacting for 5-10 min under the condition that the volume concentration of methane is 1-10%, then cooling to 900-1050 ℃, reacting for 1-4 h under the condition that the volume concentration of methane is 10-50%, so that vertical graphene sheets grow on the growth substrate, and then cooling to room temperature; wherein the reactant gas comprises hydrogen and methane.
In a second aspect, the application provides a preparation method of a three-dimensional graphene water-based epoxy anticorrosive paint, wherein a component A is obtained by mixing a water-based epoxy resin emulsion, a first water component, spherical three-dimensional graphene powder and an auxiliary agent. And mixing the waterborne epoxy resin curing agent and the second water component to obtain a component B.
The spherical three-dimensional graphene powder can be well dispersed into an aqueous solution without pretreatment, so that the coating has excellent performance.
In one possible embodiment, the method of preparing the a component comprises: mixing an auxiliary agent, a first water component and spherical three-dimensional graphene powder to obtain a mixed solution; grinding the mixed solution, and sieving the mixed solution by a sieve of 200-800 meshes to obtain filtrate; mixing the filtrate with the aqueous epoxy resin emulsion to obtain the component A.
Spherical three-dimensional graphene powder is firstly dispersed, the spherical three-dimensional graphene powder can be well dispersed into an aqueous solution without pretreatment, and the component A is filtered by a 200-800-mesh sieve to obtain a dispersion liquid with smaller particle size and difficult agglomeration, so that the dispersion liquid has excellent performance. After grinding, the aqueous epoxy resin emulsion is added for preparing the component A, so that emulsion breaking of the emulsion can be avoided.
In some possible embodiments, the auxiliary agent, the first water component and the spherical three-dimensional graphene powder are ultrasonically mixed in 50-150W for 10-60 min to obtain a mixed solution. Placing the mixed solution in a horizontal grinder, adding zirconium beads under the air inlet pressure of 0.2-1.0 MPa for grinding, and repeatedly grinding and dispersing for 1-5 times; and (4) sieving the ground mixed solution by a sieve of 200-800 meshes, and taking the filtrate.
In some possible embodiments, the filtrate is mixed with the aqueous epoxy resin emulsion to obtain the component A, and the mixing is completed by three-stage stirring: a first stage: stirring for 4-6 min at the rotating speed of 90-110 r/min; and a second stage: stirring at the rotating speed of 500-700 r/min for 25-35 min; a third stage: the rotating speed is 90-110 r/min, and the stirring is carried out for 4-6 min.
In a third aspect, the application provides a use method of a three-dimensional graphene water-based epoxy anticorrosive paint, which comprises the following steps: and mixing the component A and the component B to obtain a coating, and spraying 1-3 layers of the coating to obtain a coating, wherein the thickness of the coating is 50-150 mu m.
When the coating is used, the component A and the component B are mixed, so that the obtained coating is better in acid and alkali resistance and water resistance and higher in binding fastness.
In one possible embodiment, the mixing is accomplished in three stages of agitation: a first stage: stirring for 4-6 min at the rotating speed of 90-110 r/min; and a second stage: stirring at the rotating speed of 500-700 r/min for 25-35 min; a third stage: the rotating speed is 90-110 r/min, and the stirring is carried out for 4-6 min.
The three-dimensional graphene water-based epoxy anticorrosive paint, the preparation method and the use method thereof provided by the embodiment of the application have the beneficial effects that:
(1) the spherical three-dimensional graphene powder added in the application has a unique three-dimensional structure, is uniformly distributed in a coating to form a compact isolation layer, has excellent chemical stability and thermal stability, and can enable the coating to have excellent acid and alkali resistance, water resistance and combination fastness.
(2) The spherical three-dimensional graphene powder used in the method can be directly added into the water-based epoxy anticorrosive paint without other process treatment, the process is simple, chemical byproducts such as sulfuric acid and permanganate are not generated in the process, the water substitute material contains a VOC organic solvent, and the method is green, environment-friendly and pollution-free.
(3) The spherical three-dimensional graphene powder used in the method is low in addition amount and excellent in performance, and is beneficial to industrial production and marketization of application.
(4) The three-dimensional graphene powder used in the method has the same isotropy, and the strength of the coating and the bonding strength of the coating and the substrate can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive efforts and also belong to the protection scope of the present application.
Fig. 1 is a flow chart for preparing and using a three-dimensional graphene water-based epoxy anticorrosive paint provided in an embodiment of the present application;
FIG. 2 is an SEM image of an anticorrosion coating provided in example 1 of the present application;
FIG. 3 is an SEM image of a corrosion protective coating provided in example 3 of the present application;
fig. 4 is an SEM image of the corrosion protection coating provided in comparative example 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
The application provides globular three-dimensional graphene powder among three-dimensional graphene waterborne epoxy anticorrosive coating, it is used for preparing anticorrosive coating, has fine advantage.
The spherical three-dimensional graphene powder comprises carbon nanoparticles as a growth substrate and vertical graphene sheets growing on the carbon nanoparticles, wherein the particle size of the carbon nanoparticles is 100-300 nm, and the edge thickness of the graphene sheets is 1-3 atomic layers.
The graphene sheets grow on the carbon nanoparticles, are connected and fixed with each other to form the three-dimensional graphene powder with the spherical particle structure, show isotropy and have better interface bonding strength.
Optionally, the preparation method of the spherical three-dimensional graphene powder comprises the following steps: taking carbon nano particles as a growth substrate, heating to above 1500 ℃ in an inert gas atmosphere, reacting for 5-10 min under the condition that the volume concentration of methane is 1-10%, then cooling to 900-1050 ℃, reacting for 1-4 h under the condition that the volume concentration of methane is 10-50%, so that vertical graphene sheets grow on the growth substrate, and then cooling to room temperature; wherein the reactant gas comprises hydrogen and methane.
Further, the carbon nanoparticles are carbon black nanoparticles having a particle size of 100 to 300 nm. The edge thickness of graphene sheets in the three-dimensional graphene particles prepared by the method is 1-3 atomic layers, and the graphene sheets in the particles can be connected and fixed with each other.
The spherical three-dimensional graphene powder prepared by the preparation method is used for preparing the three-dimensional graphene water-based epoxy anticorrosive paint, and the anticorrosive paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1: 1-10: 1. The component A comprises the following components in parts by weight: 30-80 parts of water-based epoxy resin emulsion, 10-40 parts of a first water component (such as deionized water), 0.1-5 parts of spherical three-dimensional graphene powder and 2.4-13 parts of an auxiliary agent. The component B comprises: 60-95 parts of a water-based epoxy resin curing agent and 5-30 parts of a second water component (such as deionized water).
The spherical three-dimensional graphene powder obtained by the preparation method is more uniformly dispersed after being added into the anticorrosive coating, and the mutually overlapped lamellar structure improves the compactness of the coating, so that a compact isolation layer can be obtained, small molecular corrosive substances are difficult to pass through, and a physical isolation effect is achieved. After the coating is arranged on the substrate, the bonding area of the spherical three-dimensional graphene powder and the substrate is large, the coating is isotropic, the mechanical strength and the interface bonding fastness of the coating can be effectively improved, and the acid and alkali resistance and the stability of the coating can be improved.
Illustratively, the mass ratio of the component a to the component b is 1:1, 2:1, 4:1, 6:1, 8:1, or 10: 1; the weight portion of the waterborne epoxy resin emulsion is 30, 40, 50, 60, 70 or 80; the first water component is 10 parts, 20 parts, 30 parts or 40 parts by weight; the weight portion of the spherical three-dimensional graphene powder is 0.1 portion, 1 portion, 2 portions, 4 portions or 5 portions. 60 parts, 70 parts, 80 parts or 95 parts of waterborne epoxy resin curing agent; the second water component is present in 5, 10, 20 or 30 parts by weight.
Optionally, the aqueous epoxy resin emulsion comprises one or both of a sulfonic acid group modified anionic epoxy resin and a reactive emulsifier emulsified bisphenol a epoxy resin. For example: the water-based epoxy resin emulsion is sulfonic group modified anionic epoxy resin; or the water-based epoxy resin emulsion is bisphenol A epoxy resin emulsified by a reactive emulsifier; or the water-based epoxy resin emulsion is a mixture of sulfonic acid group modified anionic epoxy resin and bisphenol A epoxy resin emulsified by a reactive emulsifier. The dispersibility between the aqueous epoxy resin emulsion and the spherical three-dimensional graphene powder is better.
Optionally, the aqueous epoxy resin curing agent is a polyamine-epoxy addition modified curing agent or an aqueous polyamide curing agent. For example: the waterborne epoxy resin curing agent is polyamine-epoxy addition modified curing agent; or the water-based epoxy resin curing agent is a water-based polyamide curing agent.
In the application, the auxiliary agent comprises, by weight, 0.1-2 parts of a defoaming agent, 0.1-2 parts of a dispersing agent, 0.1-2 parts of a wetting agent, 0.1-2 parts of a thickening agent and 2-5 parts of a film-forming auxiliary agent. Illustratively, the defoamer is present in an amount of 0.1 parts, 0.5 parts, 1 part, or 2 parts by weight; the weight portion of the dispersant is 0.1 portion, 0.5 portion, 1 portion or 2 portions; the wetting agent is 0.1 part, 0.5 part, 1 part or 2 parts by weight; the weight portion of the thickening agent is 0.1 portion, 0.5 portion, 1 portion or 2 portions; the film forming assistant is 2, 3, 4 or 5 parts by weight.
Optionally, the antifoaming agent comprises one or both of a mineral oil type antifoaming agent, a silicone type antifoaming agent, and an acetylenic diol type antifoaming agent. For example: the defoaming agent is mineral oil defoaming agent; or the defoaming agent is an organic silicon defoaming agent; or the defoaming agent is an acetylene glycol defoaming agent; or the defoaming agent is a mixture of a mineral oil defoaming agent and a silicone defoaming agent; or the defoaming agent is a mixture of a silicone defoaming agent and an acetylene glycol defoaming agent; or the defoaming agent is a mixture of a mineral oil defoaming agent and an acetylene glycol defoaming agent.
The wetting agent includes one or both of an acetylenic diol surfactant and a fluorocarbon-based surfactant. For example: the wetting agent is an acetylenic diol surfactant; or the wetting agent is a fluorocarbon surfactant; or the wetting agent is a mixture of an acetylenic diol surfactant and a fluorocarbon surfactant.
The dispersant comprises one or two of a hydrophobic modified ammonium salt copolymer and a glycidyl naphthalene sulfonate. For example: the dispersant is a hydrophobic modified ammonium salt copolymer; or the dispersant is a glycidyl naphthalene sulfonate; or the dispersant is a mixture of the hydrophobically modified ammonium salt copolymer and the glycidyl naphthalene sulfonate.
The thickening agent comprises one or two of modified lithium magnesium montmorillonite and hydrophobic modified alkali swelling auxiliary agent. For example: the thickening agent is modified lithium magnesium montmorillonite; or the thickening agent is a hydrophobic modified alkali swelling auxiliary agent; or the thickening agent is a mixture of modified lithium magnesium montmorillonite and hydrophobic modified alkali swelling auxiliary agent.
The film forming assistant comprises one or two of propylene glycol methyl ether and propylene glycol methyl ether acetate. For example: the film-forming assistant is propylene glycol methyl ether; or the film-forming auxiliary agent is propylene glycol methyl ether acetate; or the film forming assistant is the mixture of propylene glycol methyl ether and propylene glycol methyl ether acetate.
Fig. 1 is a flow chart for preparing and using a three-dimensional graphene waterborne epoxy anticorrosive paint provided in an embodiment of the present application. Referring to fig. 1, in the present embodiment, the preparation method of the component a includes: a. mixing an auxiliary agent, a first water component and spherical three-dimensional graphene powder to obtain a mixed solution; optionally, the auxiliary agent, the first water component and the spherical three-dimensional graphene powder are ultrasonically mixed in 50-150W for 10-60 min to obtain a mixed solution. The ultrasonic mixing can make the spherical three-dimensional graphene powder dispersed more uniformly in the first water component, and the auxiliary agent can also be uniformly dispersed therein.
b. Grinding the mixed solution to obtain grinding fluid; optionally, the mixed solution is placed in a horizontal grinder, zirconium beads are added for grinding under the air inlet pressure of 0.2-1.0 MPa, and grinding and dispersing are repeated for 1-5 times. The particles of the three-dimensional graphene can be made smaller. The three-dimensional graphene used in the application can not be agglomerated after the grinding particle size is reduced, and can be dispersed more uniformly so as to increase the corrosion resistance and the wear resistance of the coating.
c. Sieving the grinding fluid by a sieve of 200-800 meshes, and taking a filtrate; the obtained dispersion liquid has smaller particle size and is not easy to agglomerate, so that the coating has excellent performance.
d. Mixing the filtrate with the aqueous epoxy resin emulsion to obtain the component A. Compared with the method that all the components in the component A are directly and completely mixed at the same time, the spherical three-dimensional graphene powder is uniformly dispersed with other components, and then the water-based epoxy resin emulsion is added, so that all the components in the component A can be more uniformly dispersed.
Optionally, mixing the filtrate with the aqueous epoxy resin emulsion to obtain a component A, wherein the mixing is completed by three-stage stirring: a first stage: stirring for 4-6 min at the rotating speed of 90-110 r/min; and a second stage: stirring at the rotating speed of 500-700 r/min for 25-35 min; a third stage: the rotating speed is 90-110 r/min, and the stirring is carried out for 4-6 min. The dispersion effect is better.
The preparation method of the component B comprises the following steps: and mixing the waterborne epoxy resin curing agent and the second water component to obtain a component B.
After the component A and the component B are prepared, the three-dimensional graphene water-based epoxy anticorrosive paint is used. The using method comprises the following steps: firstly, mixing the component A and the component B to obtain the coating, wherein the mixing is completed by three-stage stirring: a first stage: stirring for 4-6 min at the rotating speed of 90-110 r/min; and a second stage: stirring at the rotating speed of 500-700 r/min for 25-35 min; a third stage: stirring for 4-6 min at the rotating speed of 90-110 r/min; and spraying 1-3 layers of paint to obtain a coating, wherein the thickness of the coating is 50-150 mu m.
When the coating is used, the component A and the component B are mixed, and the mixture is stirred and mixed by the method, so that the mixture is more uniform, the coating has a compact isolation layer, the acid and alkali resistance and the water resistance are better, and the binding fastness is higher.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
(1) Preparing spherical three-dimensional graphene powder: drying carbon black, placing the carbon black in a crucible for grinding to enable the particle size of the carbon black to be between 100 nm and 300nm, laying the carbon black on a reaction zone of a reactor for chemical vapor deposition, heating to 1550 ℃ in an inert gas atmosphere, reacting for 8min under the condition that the volume concentration of methane is 8%, cooling to 1000 ℃, reacting for 3h under the condition that the volume concentration of methane is 40%, enabling vertical graphene sheets to grow on nano graphite powder, and taking out the vertical graphene sheets to obtain spherical three-dimensional graphene powder.
(2) (2) preparing a component A: 100g of defoaming agent (TEGO810), 100g of dispersing agent (SN-1792), 100g of wetting agent (TEGO410), 100g of thickening agent (Gaotai 6020), 400g of film-forming aid (ethylene glycol butyl ether), 3kg of deionized water and 40g of three-dimensional graphene (0.4 part by weight) are mixed, and the mixture is subjected to ultrasonic treatment at room temperature in 100W ultrasonic waves for 40min to obtain a mixed solution. The mixed solution is placed in a horizontal grinder, zirconium beads (the volume of the zirconium beads is about 80% of the volume of the mixed solution) are added for grinding under the air inlet pressure of 0.8MPa, and grinding and dispersion are repeated for 4 times to obtain the grinding fluid. And (4) sieving the grinding liquid with a 500-mesh sieve, and taking the filtrate. Adding 5kg of aqueous epoxy resin emulsion (consolidation 2056) into the filtrate, and stirring in a stirrer in three stages to obtain a component A, wherein the first stage comprises the following steps: stirring for 5min at the rotating speed of 100 r/min; and a second stage: the rotating speed is 600r/min, and the stirring is carried out for 30 min; a third stage: the rotating speed is 100r/min, and the stirring is carried out for 5 min.
(3) And preparing a component B: and (3) uniformly mixing 7kg of waterborne epoxy resin curing agent (consolidation 915) and 2kg of deionized water to obtain the component B.
(4) Preparing the three-dimensional graphene water-based epoxy anticorrosive paint: pouring the component B into the component A, stirring in a stirrer in a three-stage manner to obtain the anticorrosive paint, wherein the first stage is as follows: stirring for 5min at the rotating speed of 100 r/min; and a second stage: the rotating speed is 600r/min, and the stirring is carried out for 30 min; a third stage: the rotating speed is 100r/min, and the stirring is carried out for 5 min.
(5) And the use of the anticorrosive paint: and (3) spraying the coating on a dry plate, wherein the spraying thickness is about 100 mu m, placing the dry plate in a constant temperature box at 60 ℃ for self-drying, and detecting the conventional performance.
In this embodiment, a performance test of the coating is performed, where the detection method of the solid content is as follows: GB/T1725-2007; the detection method of the adhesion (grade) comprises the following steps: GB/T5210-2006; the flexibility (mm) was measured by the following method: GB/T1731-1993; the detection method of the water resistance (h) comprises the following steps: GB/T9274-1988; the detection method of the acid resistance (h) comprises the following steps: GB/T9274-1988; the detection method of the alkali resistance (h) comprises the following steps: GB/T9274-1988.
The results show that: in actual implementation, the solid content of the coating is 40.1%, the adhesive force is 1 grade, the flexibility T bend is 1mm, the water resistance is 100 hours, the acid resistance is 240 hours, and the alkali resistance is 240 hours.
FIG. 2 is an SEM photograph of the coating, and it can be seen that the coating surface is uniform and no holes and defects exist. The water-based epoxy anticorrosive paint added with the spherical three-dimensional graphene powder does not have an agglomeration phenomenon and is uniformly distributed in the paint to form a compact isolation layer, so that the water-based epoxy anticorrosive paint has a physical shielding effect on other molecules entering the surface of a test piece, the probability of corrosion of the gas molecules and water molecules on the surface of the test piece can be greatly reduced, and the acid and alkali resistance and the water resistance of the water-based epoxy anticorrosive paint are greatly improved. Meanwhile, the addition of the spherical three-dimensional graphene powder also improves the adhesive force and flexibility of a paint film.
Example 2
In this example, the amount of the three-dimensional graphene added was 20g (0.2 part by weight), and the other conditions were the same as in example 1.
The results show that: in actual implementation, the solid content of the coating is 40%, the adhesive force is 1 grade, the flexibility T bend is 1mm, the water resistance is 90 hours, the acid resistance is 225 hours, and the alkali resistance is 221 hours. The performance of the coating is slightly reduced compared with that of example 1, which shows that the addition amount of the spherical three-dimensional graphene powder is reduced, and the performance of the coating is reduced.
Example 3
In this comparative example, the amount of the three-dimensional graphene added was 80g (0.8 part by weight), and the other conditions were the same as in example 1.
The results show that: in actual implementation, the solid content of the coating is 40.3%, the adhesive force is 1 grade, the flexibility T bend is 1mm, the water resistance is 60 hours, the acid resistance is 180 hours, and the alkali resistance is 175 hours. The performance of the coating is reduced more than that of example 1, which shows that the addition amount of the spherical three-dimensional graphene powder is higher and the performance of the coating is reduced.
Fig. 3 is an SEM photograph of the coating, and the surface of the coating is slightly rough, which shows that the addition amount of the three-dimensional graphene is high, and spherical three-dimensional graphene powder is agglomerated to weaken the characteristics and the specific shielding property of the nanoparticle, and holes and defects existing in pure resin cannot be effectively filled, so that the acid-base resistance and the water resistance are deteriorated, but still superior to the coating without the spherical three-dimensional graphene powder (compared with the subsequent comparative example 1).
Example 4
In this example, the preparation method of the component a was: 100g of defoaming agent (TEGO810), 100g of dispersing agent (SN-1792), 100g of wetting agent (TEGO410), 100g of thickening agent (Gaotai 6020), 400g of film-forming additive (ethylene glycol butyl ether), 3kg of deionized water and 40g of three-dimensional graphene are mixed, and the mixture is subjected to ultrasonic treatment at room temperature in 100W ultrasonic waves for 40min to obtain a mixed solution. The mixed solution is placed in a horizontal grinder, zirconium beads (the volume of the zirconium beads is about 80% of the volume of the mixed solution) are added for grinding under the air inlet pressure of 0.8MPa, and grinding and dispersion are repeated for 4 times to obtain the grinding fluid. Adding 5kg of water-based epoxy resin emulsion (consolidation 2056) into the grinding fluid, stirring in a stirrer in three stages to obtain a component A, wherein the first stage comprises the following steps: stirring for 5min at the rotating speed of 100 r/min; and a second stage: the rotating speed is 600r/min, and the stirring is carried out for 30 min; a third stage: the rotating speed is 100r/min, and the stirring is carried out for 5 min. The other conditions were the same as in example 1.
The results show that: in actual implementation, the solid content of the coating is 40.1%, the adhesive force is 1 grade, the flexibility T bend is 1mm, the water resistance is 80h, the acid resistance is 216h, and the alkali resistance is 216 h. As can be seen by comparing example 1 with example 4, during the preparation of the a component, no filtration was performed and the resulting coating had a small decrease in water resistance, acid resistance and alkali resistance.
Comparative example 1
In this comparative example, no spherical three-dimensional graphene powder was added, and the other conditions were the same as in example 1.
The results show that: in actual implementation, the paint has the advantages of 2-grade adhesive force, 2mm flexible T bend, 48h water resistance, 63h acid resistance and 63h alkali resistance. The result shows that the performance of the coating is poor because spherical three-dimensional graphene powder is not added.
Fig. 4 is an SEM photograph of the coating, without adding spherical three-dimensional graphene powder, the coating exhibits a certain disorder, so there are obvious holes and defects inside, and the small molecule corrosive medium can contact with the metal substrate through the holes and cause corrosion, and the corrosion resistance is the worst.
Comparative example 2
In this comparative example, the three-dimensional graphene is a commercially available sheet-like three-dimensional graphene (cyclospheroidal graphene N006-P). The other conditions were the same as in example 1.
The results show that: in actual implementation, the solid content of the coating is 40.1%, the adhesive force is 1 grade, the flexibility T bend is 1mm, the water resistance is 60 hours, the acid resistance is 216 hours, and the alkali resistance is 180 hours. The performance is reduced compared with that of example 1, which shows that the water resistance, acid resistance and alkali resistance of the coating are reduced by adding the flaky three-dimensional graphene powder.
Comparative example 3
In the comparative example, the three-dimensional graphene is fibrous three-dimensional graphene (Songhu Shenjia 3DG-002) purchased in the market. The other conditions were the same as in example 1.
The results show that: in actual implementation, the solid content of the coating is 40.1%, the adhesive force is 2 grade, the flexibility T bend is 1mm, the water resistance is 50h, the acid resistance is 180h, and the alkali resistance is 160 h. The performance of the coating is lower than that of example 1, which shows that the adhesion, water resistance, acid resistance and alkali resistance of the coating are reduced by adding the fibrous three-dimensional graphene powder.
The above-described embodiments of the spherical three-dimensional graphene powder are some, but not all, embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
Claims (12)
1. The three-dimensional graphene water-based epoxy anticorrosive paint is characterized by comprising a component A and a component B, wherein the mass ratio of the component A to the component B is 1: 1-10: 1; according to the weight portion, the weight ratio of the components,
the component A comprises: 30-80 parts of water-based epoxy resin emulsion, 10-40 parts of first water component, 0.1-5 parts of spherical three-dimensional graphene powder and 2.4-13 parts of auxiliary agent;
the component B comprises: 60-95 parts of a water-based epoxy resin curing agent and 5-30 parts of a second water component;
wherein the spherical three-dimensional graphene powder includes: the method comprises the following steps that the carbon nano-particles are growth substrates and vertical graphene sheets growing on the carbon nano-particles, the particle size of the carbon nano-particles is 100-300 nm, and the edge thickness of the graphene sheets is 1-3 atomic layers;
the preparation method of the spherical three-dimensional graphene powder comprises the following steps: heating the carbon nanoparticles to above 1500 ℃ in an inert gas atmosphere, reacting for 5-10 min under the condition that the volume concentration of methane is 1-10%, cooling to 900-1050 ℃, reacting for 1-4 h under the condition that the volume concentration of methane is 10-50%, so that vertical graphene sheets grow on the growth substrate, and cooling to room temperature; wherein the reactant gas comprises hydrogen and methane.
2. The three-dimensional graphene aqueous epoxy anticorrosive paint according to claim 1, wherein the aqueous epoxy resin emulsion comprises one or both of a sulfonic acid group-modified anionic epoxy resin and a reactive emulsifier-emulsified bisphenol a epoxy resin.
3. The three-dimensional graphene waterborne epoxy anticorrosive paint according to claim 1, wherein the waterborne epoxy resin curing agent is a polyamine-epoxy addition modified curing agent or a waterborne polyamide curing agent.
4. The three-dimensional graphene water-based epoxy anticorrosive paint as claimed in any one of claims 1 to 3, wherein the auxiliary agent comprises 0.1 to 2 parts by weight of a defoaming agent, 0.1 to 2 parts by weight of a dispersing agent, 0.1 to 2 parts by weight of a wetting agent, 0.1 to 2 parts by weight of a thickening agent, and 2 to 5 parts by weight of a film-forming auxiliary agent.
5. The three-dimensional graphene waterborne epoxy anticorrosive coating according to claim 4, wherein the defoamer comprises one or more of a mineral oil type defoamer, a silicone type defoamer, and an acetylene glycol type defoamer; the wetting agent comprises one or two of an alkyne diol surfactant and a fluorocarbon surfactant; the dispersant comprises one or two of a hydrophobic modified ammonium salt copolymer and a glycidyl naphthalene sulfonate; the thickening agent comprises one or two of modified lithium magnesium montmorillonite and hydrophobic modified alkali swelling auxiliary agent; the film forming assistant comprises one or two of propylene glycol methyl ether and propylene glycol methyl ether acetate.
6. A preparation method of the three-dimensional graphene water-based epoxy anticorrosive paint as claimed in any one of claims 1 to 5,
the preparation method of the component A comprises the following steps: mixing the aqueous epoxy resin emulsion, the first water component, the spherical three-dimensional graphene powder and the auxiliary agent to obtain a component A;
the preparation method of the component B comprises the following steps: and mixing the water-based epoxy resin curing agent and the second water component to obtain the component B.
7. The method of claim 6, wherein the A component is prepared by a method comprising:
mixing the auxiliary agent, the first water component and the spherical three-dimensional graphene powder to obtain a mixed solution;
grinding the mixed solution, and sieving the mixed solution by a sieve of 200-800 meshes to obtain filtrate;
and mixing the filtrate with the aqueous epoxy resin emulsion to obtain the component A.
8. The preparation method according to claim 7, wherein the auxiliary, the first water component and the spherical three-dimensional graphene powder are ultrasonically mixed at 50-150W for 10-60 min to obtain the mixed solution.
9. The preparation method according to claim 8, wherein the mixed solution is placed in a horizontal grinder, zirconium beads are added for grinding under an air inlet pressure of 0.2-1.0 MPa, and the grinding and dispersion are repeated for 1-5 times; and (3) sieving the ground mixed solution by a sieve of 200-800 meshes, and taking the filtrate.
10. The preparation method according to claim 9, wherein the filtrate is mixed with the aqueous epoxy resin emulsion to obtain the component A, and the mixing is completed by three-stage stirring:
a first stage: stirring for 4-6 min at the rotating speed of 90-110 r/min;
and a second stage: stirring at the rotating speed of 500-700 r/min for 25-35 min;
a third stage: the rotating speed is 90-110 r/min, and the stirring is carried out for 4-6 min.
11. The use method of the three-dimensional graphene water-based epoxy anticorrosive paint according to any one of claims 1 to 5, characterized by comprising: and mixing the component A and the component B to obtain a coating, and spraying 1-3 layers of the coating to obtain a coating, wherein the thickness of the coating is 50-150 mu m.
12. The use method of claim 11, wherein the mixing to obtain the coating is completed by three-stage stirring:
a first stage: stirring for 4-6 min at the rotating speed of 90-110 r/min;
and a second stage: stirring at the rotating speed of 500-700 r/min for 25-35 min;
a third stage: the rotating speed is 90-110 r/min, and the stirring is carried out for 4-6 min.
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