CN110093058B - Low-defect graphene composition for anticorrosive paint, slurry, preparation method of slurry and anticorrosive paint - Google Patents
Low-defect graphene composition for anticorrosive paint, slurry, preparation method of slurry and anticorrosive paint Download PDFInfo
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- CN110093058B CN110093058B CN201910425136.XA CN201910425136A CN110093058B CN 110093058 B CN110093058 B CN 110093058B CN 201910425136 A CN201910425136 A CN 201910425136A CN 110093058 B CN110093058 B CN 110093058B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
- C09C3/041—Grinding
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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
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
Abstract
The invention relates to a low-defect graphene composition for an anticorrosive paint, slurry, a preparation method of the slurry and the anticorrosive paint, and belongs to the technical field of paints. The invention provides low-defect graphene slurry for an anticorrosive paint, which comprises graphene, a dispersing agent and a solvent, wherein in a Raman spectrum of the graphene, the intensity of a D peak is lower than 1/10 of the intensity of a G peak. The graphene slurry for the anticorrosive paint can exert the characteristics of high conductive sheet layers of graphene, particularly physical graphene raw materials, is suitable for anticorrosive paints of different systems, and can prolong the anticorrosive time effect and reduce the paint cost on the basis of not changing the existing paint and construction process. The method is favorable for keeping the low defect characteristic of the graphene raw material, so that the graphene with the nano-sheet layers is fully dispersed, the comprehensive performance of the anticorrosive coating with various systems can be improved, the physical barrier layers with staggered sheets can be formed to shield erosion, and the salt spray resistance can be improved.
Description
Technical Field
The invention relates to a low-defect graphene composition for an anticorrosive paint, slurry, a preparation method of the slurry and the anticorrosive paint, and belongs to the technical field of paints.
Background
The metal corrosion is generally divided into chemical corrosion and electrochemical corrosion, and the loss caused by the corrosion is not only reflected in that the material per se is damaged in aspects of appearance, color, mechanical property and the like, but also reflected in that the quality grade of a finished product and a metal structure engineering is reduced to influence the use value of the finished product and the metal structure engineering, and the loss caused by the metal corrosion accounts for about 5 percent of GDP every year.
The mode of coating the anticorrosive paint on the surface or the inner wall of the metal substrate is the most effective metal anticorrosive method with the lowest comprehensive cost at present. The prior coating is commonly prepared from inorganic zinc powder, tetrabasic zinc yellow, zinc phosphate and other electrochemical anti-corrosion fillers, mica iron oxide, glass flake and goldBelongs to physical barrier fillers such as scales, but the fillers have some problems, such as influence of zinc powder on welding, and Cr in tetrabasic zinc yellow6+The mica iron oxide has poor shielding performance, and the glass flake has low flexibility.
The graphene is sp2The single-layer two-dimensional crystal formed by hybridization has a plurality of excellent characteristics in the aspects of optics, electricity, mechanics, heat and the like, is widely concerned since the discovery in 2004, and has the room-temperature conductivity of 106S/m and the unique planar structure of graphene enable the graphene to have important application value in the field of anticorrosive coatings, and the graphene is an ideal performance reinforcing filler.
However, graphene is extremely easy to agglomerate, is difficult to disperse uniformly in the preparation of the coating, seriously hinders the performance of the coating and cannot be directly used. At present, graphene slurry is mostly used, but graphene in the existing commercial anti-corrosion slurry is prepared by an oxidation-reduction method or a strong oxidant intercalation mechanical stripping method, contains a large amount of groups and defects, has high additive content, can form stable slurry, but cannot give full play to the excellent performance of the graphene, and has influence on the existing coating formula process.
Disclosure of Invention
The first purpose of the invention is to provide a low-defect graphene composition for an anticorrosive paint, wherein the low-defect graphene slurry for the anticorrosive paint obtained from the composition can enable graphene to be uniformly dispersed in the low-defect graphene composition.
The second purpose of the invention is to provide a low-defect graphene slurry for an anticorrosive paint, wherein graphene in the slurry can be uniformly dispersed.
The third purpose of the invention is to provide a preparation method of the low-defect graphene slurry for the anticorrosive paint, which has a simple preparation process and maintains the low-defect and lamellar characteristics of graphene.
The fourth purpose of the invention is to provide an anticorrosive paint.
The technical scheme of the invention is as follows:
a low-defect graphene composition for an anticorrosive coating comprises graphene and a dispersing agent;
the dispersing agent is at least one of sodium dodecyl sulfate, hexadecyl diphenyl ether monosulfonate, phenyl alkyl benzene sulfonate, alkyl polyglucose, ethylene oxide and propylene oxide copolymer, fatty alcohol alkoxylate, hydroxypropyl methylcellulose, polyethylene glycol, silane coupling agent, polyvinylpyrrolidone and polyvinylpyrrolidone derivatives;
in a Raman spectrum of the graphene, the intensity of a D peak is lower than 1/10 of the intensity of a G peak.
The slurry obtained by the low-defect graphene composition for the anticorrosive paint can exert the characteristics of high conductive sheet layers of graphene, particularly physical graphene raw materials, is suitable for anticorrosive paints of different systems, and can prolong the anticorrosive time and reduce the paint cost on the basis of not changing the existing paint and construction process.
A low-defect graphene slurry for an anticorrosive coating comprises graphene, a dispersant and a solvent;
the dispersing agent is at least one of sodium dodecyl sulfate, hexadecyl diphenyl ether monosulfonate, phenyl alkyl benzene sulfonate, alkyl polyglucose, ethylene oxide and propylene oxide copolymer, fatty alcohol alkoxylate, hydroxypropyl methylcellulose, polyethylene glycol, silane coupling agent, polyvinylpyrrolidone and polyvinylpyrrolidone derivatives;
in a Raman spectrum of the graphene, the intensity of a D peak is lower than 1/10 of the intensity of a G peak.
The low-defect graphene slurry for the anticorrosive coating is beneficial to keeping the low-defect characteristic of a graphene raw material, so that the graphene with the nano-sheet layers is fully dispersed, and the comprehensive performance of the anticorrosive coating with various systems can be improved.
Preferably, the low-defect graphene slurry for the anticorrosive paint further comprises a stabilizer, wherein the stabilizer is at least one of styrene butadiene rubber, nitrile butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, sodium carboxymethylcellulose, arabic gum, organically modified bentonite, gelatin, xanthan gum, guar gum, sodium alginate and chitosan. Styrene butadiene rubber, nitrile butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, sodium carboxymethylcellulose, arabic gum, organically modified bentonite, gelatin, xanthan gum, guar gum, sodium alginate and chitosan are taken as stabilizing agents, so that a slurry system obtained from the low-defect graphene composition for the anticorrosive coating can be stably stored.
Preferably, the solvent is at least one of ethanol, N-butanol, propylene glycol, toluene, xylene, N-methylpyrrolidone, an epoxy reactive diluent, 1, 4-butanediol diglycidyl ether, and water. Ethanol, N-butanol, propylene glycol, toluene, xylene, N-methylpyrrolidone, an epoxy active diluent, 1, 4-butanediol diglycidyl ether and water are used as solvents, so that stable slurry can be formed by graphene and a dispersing agent, and the graphene can be uniformly dispersed in the slurry.
Preferably, the weight ratio of the graphene to the dispersant to the solvent is 4-20: 1-5: 73 to 97.9. The weight ratio is 4-20: 1-5: 73-97.9 of graphene, a dispersing agent and a solvent are beneficial to uniform dispersion of graphene, and agglomeration is effectively relieved. If the amount of the dispersing agent is too much, the risk of interference on the preparation and construction process of the coating system exists when the coating system is added, and if the amount of the dispersing agent is too little, graphene cannot be uniformly dispersed, and the agglomeration phenomenon of low-defect graphene cannot be effectively relieved.
Preferably, the low-defect graphene slurry for the anticorrosive paint further comprises an auxiliary agent, wherein the auxiliary agent is at least one of a thickening agent, a thixotropic agent and a leveling agent. Such as thickeners and thixotropic agents or thickeners, thixotropic agents and levelling agents. The thickening agent can thicken the low-defect graphene slurry for the anticorrosive paint, so that the sagging phenomenon in construction is prevented, and the slurry has excellent storage stability; the thixotropic agent can enable the low-defect graphene slurry for the anticorrosive paint to have higher viscosity at a high shearing speed during construction, is beneficial to flowing and is easy to construct, and meanwhile, enables the low-defect graphene slurry to have higher viscosity at low shearing speeds before and after construction, and can prevent sedimentation and wet film sagging. The leveling agent can enable the coating corresponding to the low-defect graphene slurry for the anticorrosive coating to form a flat, smooth and uniform coating in the process of drying and film forming.
The preparation method of the low-defect graphene slurry for the anticorrosive paint comprises the following steps:
dissolving a dispersing agent in a solvent, adding graphene, mixing, and grinding to obtain the low-defect graphene slurry for the anticorrosive paint.
The preparation method of the low-defect graphene slurry for the anticorrosive paint is simple in preparation process, and the low-defect graphene slurry for the anticorrosive paint can be prepared only by dissolving graphene in a dispersant solution, mixing and grinding. The preparation method is simple in process and easy to operate, maintains the low defect and lamellar property of graphene, and can improve the comprehensive performance, especially the salt spray resistance, of the anticorrosive paint of various systems.
Preferably, the preparation method of the low-defect graphene slurry for the anticorrosive paint comprises the following steps: dissolving a dispersing agent in a solvent, adding graphene, mixing, grinding, and adding a stabilizer and/or an auxiliary agent to obtain low-defect graphene slurry for the anticorrosive paint; the auxiliary agent is at least one of a thickening agent, a thixotropic agent and a flatting agent. The addition of the stabilizer and/or the auxiliary agent can endow the low-defect graphene slurry for the anticorrosive paint with better performance.
Preferably, the particle size D50 of the low-defect graphene in the low-defect graphene slurry for the anticorrosive paint is 5-100 μm. The low-defect graphene with the granularity D50 of 5-100 mu m can effectively avoid the quality problems of shrinkage cavity, burrs, poor adhesion and the like of a final paint film.
An anticorrosive paint comprises the low-defect graphene slurry for the anticorrosive paint and an organic paint.
Graphene in the low-defect graphene slurry for the anticorrosive paint is uniformly dispersed and can stably exist, and the low-defect graphene slurry can be mixed with an organic paint to be used as the anticorrosive paint.
Drawings
Fig. 1 is a schematic diagram of corrosion conditions of a paint film obtained by mixing the low-defect graphene slurry for anticorrosive paint obtained in example 1 with a water-based primer and a paint film of a control sample 1 after a salt spray resistance experiment;
fig. 2 is a schematic diagram of corrosion conditions of a paint film obtained by mixing the low-defect graphene slurry for anticorrosive paint obtained in example 2 with a water-based primer and a paint film of a control sample 2 after a salt spray resistance experiment.
Detailed Description
The present invention will be further described with reference to the following embodiments.
In the low-defect graphene composition for the anticorrosive paint, the graphene has a long-range periodic ordered structure. The graphene has a sharp 2D peak in a Raman spectrum. The distance between the 2D peak and the G peak of the graphene is reduced by 5cm compared with the distance between the 2D peak and the G peak of the graphite-1The above.
In the low-defect graphene composition for the anticorrosive coating, the low-defect graphene composition for the anticorrosive coating further comprises a stabilizer, wherein the stabilizer is at least one of styrene butadiene rubber, nitrile butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, sodium carboxymethylcellulose, Arabic gum, organic modified bentonite, gelatin, xanthan gum, guar gum, sodium alginate and chitosan.
In the low-defect graphene composition for the anticorrosive paint, in a Raman spectrum of graphene, the D peak intensity is lower than 1/10 of the G peak intensity.
In the low-defect graphene composition for the anticorrosive paint, the weight ratio of graphene to a dispersing agent is 4-20: 1 to 5.
The low-defect graphene composition for the anticorrosive paint further comprises an auxiliary agent, wherein the auxiliary agent is at least one of a thickening agent, a thixotropic agent and a leveling agent. Such as auxiliaries including thickeners and thixotropic agents, or auxiliaries including thickeners, thixotropic agents and levelling agents.
In the low-defect graphene slurry for the anticorrosive paint, the carbon-oxygen ratio in a Raman spectrum of graphene is more than 20.
In the low-defect graphene slurry for the anticorrosive coating, disclosed by the invention, the graphene has a long-range periodic ordered structure. The graphene has a sharp 2D peak in a Raman spectrum. The distance between the 2D peak and the G peak of the graphene is reduced by 5cm compared with the distance between the 2D peak and the G peak of the graphite-1The above.
In the low-defect graphene slurry for the anticorrosive coating, the average number of graphene layers is less than 20. The graphene having an average number of layers of 20 or less is thin and has a high degree of exfoliation.
In the low-defect graphene slurry for the anticorrosive coating, the viscosity of the low-defect graphene slurry for the anticorrosive coating is 100-5000 mPa & s. The total content of impurities in the low-defect graphene slurry for the anticorrosive paint is less than 500 ppm.
In the preparation method of the low-defect graphene slurry for the anticorrosive paint, the grinding is sanding.
In the preparation method of the low-defect graphene slurry for the anticorrosive paint, the mixing is high-speed shearing. The high-speed shearing speed is 1500-2500 rpm.
According to the preparation method of the low-defect graphene slurry for the anticorrosive paint, after high-speed shearing and grinding, after a stabilizer and/or an auxiliary agent are/is added, stirring and defoaming are carried out under negative pressure, so that the low-defect graphene slurry for the anticorrosive paint is obtained. The negative pressure is-0.06 MPa to-0.08 MPa.
In the anticorrosive paint, the organic paint is water-based acrylic primer, water-based metallic paint or mixed solution of a paint curing agent and a polyurethane solution.
Example 1 of Low-Defect graphene paste for anticorrosive coating
The low-defect graphene slurry for the anticorrosive paint comprises the following components in parts by weight:
10 parts of low-defect graphene, 1 part of dispersant hexadecyl diphenyl ether monosulfonic acid, 0.5 part of thickener Natrosol 250HBR and 88.5 parts of deionized water.
The low-defect graphene is a CP1001 type vermicular three-dimensional graphene nanocluster produced by Zhengzhou Xin material science and technology limited, the average lamella is less than 10, and the carbon-oxygen ratio is more than 20.
Example 2 of low-defect graphene paste for anticorrosive coating
The low-defect graphene slurry for the anticorrosive paint comprises the following components in parts by weight:
10 parts of low-defect graphene, 1 part of polyethylene glycol serving as a dispersant, 0.4 part of fluorocarbon surfactant, 0.3 part of RM-8W serving as a thickening agent, BYK-3330.2 parts of a flatting agent and 88.5 parts of deionized water.
Wherein the polyethylene glycol is PEG 12000.
The fluorocarbon surfactant is 3M FC-4430.
The thickener RM-8W is nonionic polyurethane associative thickener.
Example 1 of low-defect graphene and low-defect graphene slurry for anticorrosive coating.
Example 3 of low defect graphene paste for anticorrosive coating
The low-defect graphene slurry for the anticorrosive paint comprises the following components in parts by weight:
10 parts of low-defect graphene, 0.3 part of styrene butadiene rubber serving as a stabilizer and 89 parts of n-butyl alcohol.
Wherein the styrene butadiene rubber is JSR TRD 2001.
Example 1 of low-defect graphene and low-defect graphene slurry for anticorrosive coating.
Example 4 of low defect graphene paste for anticorrosive coating
The low-defect graphene slurry for the anticorrosive paint comprises the following components in parts by weight:
12 parts of low-defect graphene, 3 parts of dispersant polyvinylpyrrolidone and 85 parts of deionized water.
Wherein, the polyvinylpyrrolidone is PVP K30, and the low-defect graphene is the same as the low-defect graphene slurry for the anticorrosive paint in example 1.
Example 5 of low defect graphene paste for anticorrosive coating
The low-defect graphene slurry for the anticorrosive paint comprises the following components in parts by weight:
20 parts of low-defect graphene, 5 parts of dispersant polyvinylpyrrolidone and 75 parts of deionized water.
Wherein, the polyvinylpyrrolidone is PVP K30, and the low-defect graphene is the same as the low-defect graphene slurry for the anticorrosive paint in example 1.
Example 6 of low defect graphene paste for anticorrosive coating
The low-defect graphene slurry for the anticorrosive paint comprises the following components in parts by weight:
4 parts of low-defect graphene, a dispersing agent, 2 parts of polyvinylpyrrolidone and 94 parts of deionized water.
Wherein, the polyvinylpyrrolidone is PVP K30, and the low-defect graphene is the same as the low-defect graphene slurry for the anticorrosive paint in example 1.
Example 7 of low defect graphene paste for anticorrosive coating
The low-defect graphene slurry for the anticorrosive paint comprises the following components in parts by weight:
20 parts of low-defect graphene, 0.5 part of dispersing agent, 0.5 part of polyvinylpyrrolidone and 79.5 parts of deionized water.
Wherein, the polyvinylpyrrolidone is PVP K30, and the low-defect graphene is the same as the low-defect graphene slurry for the anticorrosive paint in example 1.
Example 8 of Low-Defect graphene paste for anticorrosive coating
The low-defect graphene slurry for the anticorrosive paint comprises the following components in parts by weight:
20 parts of low-defect graphene, 10 parts of dispersant polyvinylpyrrolidone and 70 parts of deionized water.
Wherein, the polyvinylpyrrolidone is PVP K30, and the low-defect graphene is the same as the low-defect graphene slurry for the anticorrosive paint in example 1.
Example 1 of preparation method of low-defect graphene paste for anticorrosive paint
The preparation method of the low-defect graphene slurry for the anticorrosive paint of the embodiment is that the components are weighed according to the embodiment 1 of the low-defect graphene slurry for the anticorrosive paint, and comprises the following steps:
adding dispersant hexadecyl diphenyl ether monosulfonic acid sodium into deionized water, uniformly mixing, adding low-defect graphene, shearing and stirring at a high speed of 2000rpm for 4 hours to obtain a low-defect graphene mixed solution, pumping the mixed solution into a sand mill, grinding at a high speed for 8 hours by using a 1mm zirconium ball, then mixing with a thickening agent Natrosol 250HBR, and stirring under a negative pressure of-0.08 MPa to obtain the low-defect graphene slurry for the anticorrosive paint, wherein the granularity D50 of the low-defect graphene is 15 microns.
Example 2 of preparation method of low-defect graphene paste for anticorrosive paint
The preparation method of the low-defect graphene slurry for the anticorrosive coating of the embodiment is that the components are weighed according to the embodiment 2 of the low-defect graphene slurry for the anticorrosive coating, and comprises the following steps:
adding a dispersant polyethylene glycol and a fluorocarbon surfactant into deionized water, uniformly mixing, adding low-defect graphene, shearing and stirring at a high speed of 2000rpm for 4 hours to obtain a low-defect graphene mixed solution, pumping the mixed solution into a sand mill, grinding at a high speed for 4 hours by using a zirconium ball with the diameter of 1mm, then mixing with a thickening agent RM-8W and a flatting agent BYK-333, and stirring under the negative pressure of-0.08 MPa to obtain the low-defect graphene slurry for the anticorrosive paint, wherein the granularity D50 of the low-defect graphene is 23 microns.
Example 3 of preparation method of low-defect graphene paste for anticorrosive paint
The preparation method of the low-defect graphene slurry for the anticorrosive paint of the embodiment is to weigh the components according to the embodiment 3 of the low-defect graphene slurry for the anticorrosive paint, and comprises the following steps:
adding a dispersing agent Kelain TC93 into n-butyl alcohol, uniformly mixing, adding low-defect graphene, shearing and stirring at a high speed of 2000rpm for 4 hours to obtain a low-defect graphene mixed solution, pumping the mixed solution into a sand mill, grinding at a high speed for 12 hours by using a zirconium ball with the diameter of 0.3mm, then mixing with a stabilizer organically modified bentonite, and stirring at a negative pressure of-0.08 MPa to obtain the low-defect graphene slurry for the anticorrosive paint, wherein the particle size D50 of the low-defect graphene is 6 mu m.
Example 4 method for preparing low-defect graphene paste for anticorrosive paint
The preparation method of the low-defect graphene slurry for the anticorrosive paint of the embodiment is to weigh the components according to the embodiment 4 of the low-defect graphene slurry for the anticorrosive paint, and comprises the following steps:
adding a dispersant polyvinylpyrrolidone K30 into deionized water, uniformly mixing, adding low-defect graphene, shearing and stirring at a high speed of 2000rpm for 5 hours to obtain a low-defect graphene mixed solution, pumping the mixed solution into a sand mill, grinding at a high speed for 6 hours by using a zirconium ball with the diameter of 1mm, and stirring under the negative pressure of-0.08 MPa to obtain the low-defect graphene slurry for the anticorrosive paint.
Examples 5 to 8 of preparation method of low-defect graphene slurry for anticorrosive paint
Examples 5 to 8 of the preparation method of the low-defect graphene paste for the anticorrosive paint are respectively obtained by weighing the components according to examples 5 to 8 of the low-defect graphene paste for the anticorrosive paint, and the specific preparation method is the same as example 4 of the preparation method of the low-defect graphene paste for the anticorrosive paint.
Example 1 of Low-Defect graphene composition for anticorrosive coating
The low-defect graphene composition for an anticorrosive coating of the present embodiment is different from example 1 of the low-defect graphene paste for an anticorrosive coating in that the present embodiment does not contain a solvent, and other components and amounts are the same as those of example 1 of the low-defect graphene paste for an anticorrosive coating. Specifically, the present embodiment comprises the following components in parts by weight:
10 parts of low-defect graphene, 1 part of dispersant hexadecyl diphenyl ether monosulfonic acid, and 0.5 part of thickener Natrosol 250 HBR.
Examples 2 to 8 of Low-Defect graphene composition for anticorrosive coating
Examples 2 to 8 of the low-defect graphene composition for the anticorrosive coating are different from examples 2 to 8 of the low-defect graphene slurry for the anticorrosive coating in that examples 2 to 8 of the low-defect graphene composition for the anticorrosive coating do not contain a solvent, and the other components of examples 2 to 8 of the low-defect graphene composition for the anticorrosive coating correspond to examples 2 to 8 of the low-defect graphene slurry for the anticorrosive coating one by one.
Comparative example 1
The low-defect graphene slurry for the anticorrosive paint comprises the following components in parts by weight: 10 parts of low-defect graphene and 90 parts of deionized water.
Comparative example 2
The difference between the graphene paste of the present comparative example and example 1 of the low-defect graphene paste for the anticorrosive paint is that the types of the graphene are different, and the graphene of the present comparative example is FLG101, a hong na xin new materials science and technology limited company. The other components and the using amount are the same as those of example 1 of the low-defect graphene slurry for the anticorrosive paint.
Test example 1
1. Performance of example 1 of Low-Defect graphene paste for anticorrosive coating
By mass percent, 2.5% of the low-defect graphene slurry for the anticorrosive paint in the example 1 was taken, after being evenly mixed with 97.5 percent of Master Jue multifunctional water-based acrylic primer, a 100 mu m standard template is prepared according to GBT1771-2007, comparative sample 1 is a sample plate with a thickness of 100 μm prepared from the water-based primer without adding graphene, and the neutral salt spray resistance test is carried out according to the national standard GBT1771-2007, and the result is shown in figure 1, in fig. 1, 1 is a schematic diagram of corrosion of a control sample 1 at 0h after a salt spray resistance experiment is performed on a paint film, 2 is a schematic diagram of corrosion of the control sample 1 at 18h after the salt spray resistance experiment is performed on the paint film, 3 is a schematic diagram of corrosion of the low-defect graphene slurry for an anticorrosive paint at 0h after the salt spray resistance experiment is performed on the paint film in example 1, and 4 is a schematic diagram of corrosion of the low-defect graphene slurry for an anticorrosive paint at 120h after the salt spray resistance experiment is performed on the paint film in example 1. The rust rating of the paint film of the control sample 1 after 18h is judged as S1 according to GBT1771-2007, and the rust rating of the paint film of the example 1 of the low-defect graphene slurry for the anticorrosive paint after 120h is S1.
2. Example 2 performance of low defect graphene paste for anti-corrosive coating
By mass percent, 2.5% of the low-defect graphene slurry for the anticorrosive paint in the example 2 was taken, after being evenly mixed with 97.5 percent Master Jue water-based metallic paint, a 100 mu m standard sample plate is made according to GBT1771-2007, comparative sample 2 is a sample plate with the thickness of 100 μm made of the water-based metallic paint without adding graphene, and the neutral salt spray resistance test is carried out according to the national standard GBT1771-2007, and the result is shown in figure 2, in fig. 2, 5 is a schematic diagram of corrosion of the control sample 2 at 0h after the salt spray resistance test is performed on the paint film, 6 is a schematic diagram of corrosion of the control sample 2 at 24h after the salt spray resistance test is performed on the paint film, 7 is a schematic diagram of corrosion of the low-defect graphene slurry for anticorrosive paint at 0h after the salt spray resistance test is performed on the paint film in example 2, and 8 is a schematic diagram of corrosion of the low-defect graphene slurry for anticorrosive paint at 160h after the salt spray resistance test is performed on the paint film in example 2. The rust rating of the paint film of the control 2 after 24h was judged as S1 according to GBT1771-2007, and the rust rating of the paint film of example 2 of the low-defect graphene slurry for an anticorrosive paint after 160h was S1.
3. Performance of example 3 of Low Defect graphene paste for anticorrosive coating
The low-defect graphene slurry for the anticorrosive paint in example 3, which is 4% of the low-defect graphene slurry for the anticorrosive paint, is mixed with 36% of a diphenylmethane diisocyanate curing agent and 60% of a polyurethane solution in percentage by mass, a 100 μm standard sample is prepared according to GBT1771-2007, a 36% diphenylmethane diisocyanate curing agent to which no graphene is added is mixed with the 60% polyurethane solution in control sample 3, a neutral salt spray resistance test is performed according to national standard GBT1771-2007, the rust rating of the paint film of control sample 3 after 1500 hours is S1, and the rust rating of the paint film of example 3, which is the low-defect graphene slurry for the anticorrosive paint after 2300 hours, is S1.
Test example 2
According to the mass percentage, 2.5% of the graphene slurry for the low-defect graphene slurry for the anticorrosive paint in the embodiments 1-8 and the graphene slurry for the comparative examples 1-2 are uniformly mixed with 97.5% of multifunctional water-based acrylic primer for Master Jue, then a 100-micron standard sample is prepared according to GBT1771-2007, a neutral salt spray resistance test is carried out according to national standard GBT1771-2007, and the time for the rusting grade of a paint film corresponding to the graphene slurry for the low-defect graphene slurry for the anticorrosive paint in the embodiments 1-8 and the graphene slurry for the comparative examples 1-2 to reach S1 is shown in Table 1. Table 1 time until rust grade of paint film corresponding to low-defect graphene pastes for anticorrosive paint of examples 1 to 8 and comparative examples 1 to 2 reaches S1
| Time (h) until rust grade reached S1 | |
| Example 1 | 120 |
| Example 2 | 114 |
| Example 3 | 126 |
| Example 4 | 130 |
| Example 5 | 138 |
| Example 6 | 117 |
| Example 7 | 108 |
| Example 8 | 103 |
| Comparative example 1 | 30 |
| Comparative example 2 | 91 |
Experimental results show that the salt spray resistance of the low-defect graphene slurry for the anticorrosive paint is good in examples 1-8, and the time for the rust grade of a corresponding paint film to reach S1 is more than 100 hours.
Claims (8)
1. The low-defect graphene slurry for the anticorrosive paint is characterized by comprising graphene, a dispersing agent and a solvent;
the dispersing agent is at least one of sodium dodecyl sulfate, hexadecyl diphenyl ether monosulfonate, phenyl alkyl benzene sulfonate, alkyl polyglucose, ethylene oxide and propylene oxide copolymer, fatty alcohol alkoxylate, hydroxypropyl methylcellulose, polyethylene glycol, silane coupling agent, polyvinylpyrrolidone and polyvinylpyrrolidone derivatives; the weight ratio of the graphene to the dispersant to the solvent is 4-20: 1-5: 73-97.9;
in the Raman spectrum of the graphene, the intensity of a D peak is lower than 1/10 of the intensity of a G peak, a sharp 2D peak is formed, and the distance between the 2D peak and the G peak of the graphene is reduced by 5cm compared with the distance between the 2D peak and the G peak of the graphite-1The above.
2. The graphene paste with low defect for anticorrosive paint according to claim 1, further comprising a stabilizer, wherein the stabilizer is at least one of styrene butadiene rubber, nitrile butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, sodium carboxymethylcellulose, gum arabic, organically modified bentonite, gelatin, xanthan gum, guar gum, sodium alginate and chitosan.
3. The graphene paste with low defects for anticorrosive paint according to claim 1, wherein the solvent is at least one of ethanol, N-butanol, propylene glycol, toluene, xylene, N-methylpyrrolidone, epoxy reactive diluent, 1, 4-butanediol diglycidyl ether, and water.
4. The graphene paste with low defects for anticorrosive paint according to claim 1, further comprising an auxiliary agent, wherein the auxiliary agent is at least one of a thickener, a thixotropic agent and a leveling agent.
5. The preparation method of the low-defect graphene paste for the anticorrosive paint according to claim 1, characterized by comprising the following steps:
dissolving a dispersing agent in a solvent, adding graphene, mixing, and grinding to obtain the low-defect graphene slurry for the anticorrosive paint.
6. The preparation method of the low-defect graphene slurry for the anticorrosive paint according to claim 5, characterized by comprising the following steps:
dissolving a dispersing agent in a solvent, adding graphene, mixing, grinding, and adding a stabilizer and/or an auxiliary agent to obtain low-defect graphene slurry for the anticorrosive paint; the auxiliary agent is at least one of a thickening agent, a thixotropic agent and a flatting agent.
7. The preparation method of the low-defect graphene paste for the anticorrosive paint according to claim 5 or 6, wherein the particle size D50 of graphene in the low-defect graphene paste for the anticorrosive paint is 5-100 μm.
8. An anticorrosive paint, characterized by comprising an organic paint and the low-defect graphene paste for anticorrosive paint according to any one of claims 1 to 4.
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