CN111470515B - Graphene-boron carbon nanosheet and application thereof, graphene-boron carbon nanosheet doped anticorrosive coating and preparation method thereof - Google Patents
Graphene-boron carbon nanosheet and application thereof, graphene-boron carbon nanosheet doped anticorrosive coating and preparation method thereof Download PDFInfo
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Abstract
The graphene-boron carbon nanosheet provided by the invention enables graphene oxide and the boron carbon nanosheet to be stacked layer by layer and tightly combined together under the action of pi-pi force, so that the hardness of the graphene-boron carbon nanosheet is improved, and meanwhile, the dispersibility of the graphene-boron carbon nanosheet is improved due to the hydrophilicity of the boron carbon nanosheet. The embodiment result shows that the water resistance of the doped graphene-boron carbon nanosheet anticorrosive coating prepared by the invention reaches 1033-1144 h, the acid resistance reaches 2124-2564 h, the alkali resistance reaches 2754-3165 h, the humidity resistance reaches 1316-1645 h, the salt spray resistance reaches 3321-4567 h, the impact resistance reaches 70-81 cm, and all the performances are obviously higher than the national standard.
Description
Technical Field
The invention belongs to the field of anticorrosive coatings, and particularly relates to a graphene-boron carbon nanosheet and application thereof, a graphene-boron carbon nanosheet doped anticorrosive coating and a preparation method thereof.
Background
The modern industry is not aware of the use of metallic materials, which are damaged by the action of the surrounding medium, known as metal corrosion, which is the most common form of corrosion. During corrosion, chemical or electrochemical multiphase reaction occurs on the interface of metal, so that the metal is converted into an oxidation (ion) state, which can obviously reduce the mechanical properties of the metal material, such as strength, plasticity, toughness and the like, destroy the geometric shape of a metal component, increase the abrasion among parts, shorten the service life of equipment, and even cause disastrous accidents, such as fire, explosion and the like.
The losses due to metal corrosion are very severe and effective means of metal corrosion protection becomes of particular importance. The anticorrosion coating method is a simple and effective anticorrosion means and is widely applied to metal corrosion protection systems. Due to the special structure of the graphene, the graphene can be used for blocking an erosion medium and protecting a metal matrix. The graphene is added into the anticorrosive paint, so that the performance of the anticorrosive paint can be improved.
Chinese patent CN110157289A discloses a water-based graphene anticorrosive paint, which is prepared by taking water-based resin and graphene dispersion liquid as main raw materials, and has the characteristics of energy conservation, environmental protection, good adhesive force, strong water resistance and prominent anticorrosive property.
Chinese patent CN 109593391A discloses a graphene anticorrosive coating, which comprises: the graphene anticorrosive coating provided by the invention has high corrosion resistance, excellent flexibility, wear resistance, oil resistance, aging resistance and antirust performance.
Chinese patent CN 107916047A discloses a graphene anticorrosive coating, and the salt spray resistance of the graphene anticorrosive coating obtained by limiting the sheet diameter, the number of layers of thickness and the specific surface area of graphene reaches 1600 h.
Graphene anticorrosive coatings are widely applied, but with the deterioration of application environment, higher requirements are put on the anticorrosive coatings, and higher anticorrosive performance is required.
Disclosure of Invention
The invention aims to provide a graphene-boron carbon nanosheet and application thereof. When the coating is used in an anticorrosive coating, the anticorrosive performance of the coating can be improved.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a graphene-boron carbon nanosheet, which is prepared by a preparation method comprising the following steps:
s1, mixing boron, chitosan and dicyandiamide, heating for the first time, and carrying out first self-assembly to obtain boron-carbon nanosheets;
s2, mixing the boron carbon nanosheets, graphene oxide and water, then heating for the second time, and carrying out second self-assembly to obtain graphene-boron carbon nanosheets;
the graphene-boron carbon nanosheet has a layered structure.
Preferably, the mass ratio of the boron to the chitosan to the dicyandiamide is 3.8-4.2: 1.8-2.2: 2.8-3.2.
Preferably, the temperature of the first self-assembly in the step S1 is 600 to 800 ℃.
Preferably, the mass ratio of the boron carbon nanosheets, the graphene oxide and the water in the step S2 is 1:1: 10-25.
Preferably, the temperature of the second self-assembly in the step S2 is 700 to 1000 ℃.
The invention also provides an application of the graphene-boron carbon nanosheet in the technical scheme in an anticorrosive coating.
The invention also provides a graphene-boron carbon nanosheet doped anticorrosive coating which comprises the following components in parts by mass:
preferably, the dispersant is a high molecular polymer, and the high molecular polymer is an unsaturated polycarboxylic acid polymer and/or modified polyurethane.
Preferably, the curing agent is an aliphatic polyamine curing agent, and the aliphatic polyamine curing agent is one or more of vinyl triamine, trimethyl hexamethylene diamine and m-xylylenediamine.
The invention also provides a preparation method of the graphene-boron carbon nanosheet doped anticorrosive coating in the technical scheme, which comprises the following steps:
1) firstly mixing the graphene-boron carbon nanosheets with a dispersing agent, a defoaming agent and a thickening agent to obtain graphene-boron carbon nanosheet slurry;
2) secondly mixing the graphene-boron carbon nanosheet slurry obtained in the step 1) with acrylic acid modified alkyd resin, pigment, zinc sulfate, a flatting agent and water to obtain a prefabricated coating;
3) thirdly, mixing the prefabricated coating in the step 2) with a curing agent to obtain the graphene-boron carbon nanosheet doped anticorrosive coating.
The invention provides a graphene-boron carbon nanosheet, which is obtained according to the following preparation method, firstly, boron, chitosan and dicyandiamide are mixed and then are subjected to first heating, and then first assembly is carried out, so that the boron carbon nanosheet is obtained; then mixing the boron carbon nanosheets, graphene oxide and water, then carrying out second heating, and carrying out second self-assembly to obtain graphene-boron carbon nanosheets; the graphene-boron carbon nanosheet has a layer-by-layer stacked lamellar structure. According to the graphene-boron carbon nanosheet, the graphene and the boron carbon nanosheet are stacked and tightly combined layer by layer under the action of pi-pi force, so that the hardness of the graphene-boron carbon nanosheet is improved, meanwhile, the dispersity of the graphene-boron carbon nanosheet is improved due to the hydrophilicity of the boron carbon nanosheet, when the graphene-boron carbon nanosheet is used in an anticorrosive coating, the graphene-boron carbon nanosheet is promoted to be fully filled in a resin matrix (acrylic acid modified alkyd resin in the invention), the gap defect of the anticorrosive coating is repaired, the compactness of the coating is enhanced, the shielding effect of the coating on a corrosive medium is improved, and the anticorrosive performance of the coating is further improved.
The invention provides a graphene-boron carbon nanosheet doped anticorrosive paint which comprises, by mass, 2-10 parts of graphene-boron carbon nanosheets, 10-30 parts of acrylic acid modified alkyd resin, 5-20 parts of pigment, 5-25 parts of zinc sulfate, 1-2 parts of dispersing agent, 0.2-0.5 part of defoaming agent, 0.1-0.5 part of thickening agent, 1-5 parts of flatting agent, 5-30 parts of curing agent and 3-10 parts of water. The graphene and the boron carbon nanosheet can be uniformly dispersed in the acrylic acid modified alkyd resin, are fully filled in the acrylic acid modified alkyd resin, repair the gap defect of the anticorrosive coating, and enhance the compactness of the coating so as to improve the shielding effect of the coating on a corrosive medium. Meanwhile, the graphene-boron carbon nanosheets have higher hardness, and are uniformly dispersed in the anticorrosive coating, so that the impact resistance of the anticorrosive coating is improved. The graphene-boron carbon nanosheet doped anticorrosive coating has higher anticorrosive performance under the coordination of the components. The embodiment result shows that the water resistance of the doped graphene-boron carbon nanosheet anticorrosive coating prepared by the invention reaches 1033-1144 h, the acid resistance reaches 2124-2564 h, the alkali resistance reaches 2754-3165 h, the humidity resistance reaches 1316-1645 h, the salt spray resistance reaches 3321-4567 h, the impact resistance reaches 70-81 cm, and all the performances are obviously higher than the national standard.
Drawings
Fig. 1 is an electron microscope image of graphene-boron carbon nanosheets.
Detailed Description
The invention provides a graphene-boron carbon nanosheet, which is prepared by a preparation method comprising the following steps:
s1, mixing boron, chitosan and dicyandiamide, heating for the first time, and carrying out first self-assembly to obtain boron-carbon nanosheets;
s2, mixing the boron carbon nanosheets, graphene oxide and water, then heating for the second time, and carrying out second self-assembly to obtain graphene-boron carbon nanosheets;
the graphene-boron carbon nanosheet has a layer-by-layer stacked lamellar structure.
According to the invention, boron, chitosan and dicyandiamide are mixed and then subjected to first heating, and first self-assembly is carried out, so as to obtain the boron-carbon nanosheet. In the invention, the mass ratio of the boron, the chitosan and the dicyandiamide is preferably 3.8-4.2: 1.8-2.2: 2.8-3.2, more preferably 4:2:3, the boron is preferably boron powder, and the particle size of the boron powder is preferably 5-20 μm. In the invention, the temperature of the first self-assembly is preferably 600-800 ℃, and further preferably 650-700 ℃; the temperature rise rate of the first heating is preferably 2-15 ℃/min, and more preferably 5-10 ℃/min. Preferably, first heat preservation treatment is performed after the first heating temperature is raised to a first self-assembly temperature, in the first heat preservation treatment process, the chitosan and the dicyandiamide are used as carbon sources, the boron and the carbon sources are subjected to self-assembly, and the first heat preservation treatment time is preferably 1-5 hours, and more preferably 2-4 hours.
In the invention, the boron carbon nanosheet has the characteristics of low expansion coefficient and good high-temperature heat insulation, and the expansion coefficient of the boron carbon nanosheet is 2 multiplied by 10-5K-1Thermal conductivity of 57Wm-1℃-1The durability of the graphene-boron carbon nanosheet doped anticorrosive coating is improved; the boron carbon nanosheet has hydrophilicity and wettability, promotes dispersion of graphene in acrylic acid modified alkyd resin after self-assembly with graphene oxide, and is beneficial to improvement of uniformity and stability of the coating.
And after obtaining the boron-carbon nanosheets, mixing the boron-carbon nanosheets with graphene oxide and water, then carrying out second heating, and carrying out second self-assembly to obtain the graphene-boron-carbon nanosheets. In the invention, the mass ratio of the boron carbon nanosheets to the graphene oxide to the water is preferably 1:1: 10-25, and more preferably 1:1: 15-19, the graphene oxide has a lamellar structure, and the lamellar structure has permeation resistance to gas molecules and can prevent corrosive gas from entering the coating to corrode a metal material. In the invention, the temperature of the second self-assembly is preferably 700-1000 ℃, and further preferably 800-900 ℃; the temperature rise rate of the second heating is preferably 5-20 ℃/min, and more preferably 10-15 ℃/min; and after the second heating and temperature rise is carried out to a second self-assembly temperature, preferably carrying out second heat preservation treatment, wherein in the second heat preservation treatment process, the boron carbon nanosheets and the graphene oxide are subjected to second self-assembly, in the second assembly process, the graphene oxide is reduced to graphene, and the second heat preservation treatment time is preferably 1-30 h, and further preferably 15-20 h.
In the present invention, the second heating is preferably performed under a protective atmosphere, the protective atmosphere is preferably one of argon gas and nitrogen gas, and the flow rate of the protective atmosphere is preferably 100 to 300sccm, and more preferably 150 to 200 sccm.
In the invention, the graphene-boron carbon nanosheets have a layer-by-layer stacked structure, and graphene in the graphene-boron carbon nanosheets and the boron carbon nanosheets are tightly combined together by pi-pi acting force, so that graphene layers are tightly combined, and the mechanical strength of the graphene-boron carbon nanosheet doped anticorrosive paint is improved.
The invention also provides an application of the graphene-boron carbon nanosheet in the technical scheme in an anticorrosive coating. The graphene-boron carbon nanosheet is doped into the acrylic acid modified alkyd resin anticorrosive paint, so that the moisture and heat resistance, the impact resistance, the acid resistance, the alkali resistance and the water resistance of the acrylic acid modified alkyd resin anticorrosive paint can be improved, and the corrosion resistance of the acrylic acid modified alkyd resin anticorrosive paint is improved.
The invention also provides a graphene-boron carbon nanosheet doped anticorrosive coating which comprises the following components in parts by mass: 2-10 parts of graphene-boron carbon nanosheet, 10-30 parts of acrylic acid modified alkyd resin, 5-20 parts of pigment, 5-25 parts of zinc sulfate, 1-2 parts of dispersing agent, 0.2-0.5 part of defoaming agent, 0.1-0.5 part of thickening agent, 1-5 parts of flatting agent, 5-30 parts of curing agent and 3-10 parts of water.
The graphene-boron carbon nanosheet-doped anticorrosive coating provided by the invention comprises 2-10 parts by mass of the graphene-boron carbon nanosheet in the technical scheme, preferably 3-8 parts by mass, and further preferably 4-6 parts by mass. In the invention, the graphene-boron carbon nanosheet has a layer-by-layer stacked lamellar structure.
Based on the mass parts of the graphene-boron carbon nanosheets, the anti-corrosive paint doped with the graphene-boron carbon nanosheets comprises 10-30 parts of acrylic acid modified alkyd resin, preferably 15-20 parts. In the invention, the acrylic acid modified alkyd resin is water-soluble, does not need to use an organic solvent, and has high environmental protection property. The invention has no special requirements on the acrylic acid modified alkyd resin, and only needs to select a commercial product.
Based on the mass parts of the graphene-boron carbon nanosheets, the anti-corrosive paint doped with the graphene-boron carbon nanosheets comprises 5-20 parts of pigment, preferably 8-15 parts of pigment, and further preferably 10-13 parts of pigment. In the invention, the pigment can enrich the color of the graphene-boron carbon nanosheet anticorrosive coating, the pigment preferably comprises one or more of titanium dioxide, chrome yellow, chromium oxide green, iron blue and iron red, and when the pigment comprises a plurality of pigments, no special requirement is imposed on the dosage ratio of the pigments, so long as the required color is obtained by mixing.
By taking the mass parts of the graphene-boron carbon nanosheets as the reference, the anti-corrosive paint doped with the graphene-boron carbon nanosheets comprises 5-25 parts of zinc sulfate, and preferably 8-10 parts of zinc sulfate. In the invention, the zinc sulfate has an antirust function, and the zinc sulfate negatively shifts the corrosion potential of steel in medium water, increases the overpotential of hydrogen evolution in the water medium, and slows down the cathode reduction process in electrochemical corrosion, thereby inhibiting the electrochemical corrosion; meanwhile, zinc ions can react with hydroxyl ions in water to generate zinc hydroxide which is deposited on the surface of the steel to form a protective film, so that the steel is prevented from being corroded.
Based on the mass parts of the graphene-boron carbon nanosheets, the anti-corrosive paint doped with the graphene-boron carbon nanosheets comprises 1-2 parts of a dispersing agent, preferably 1.2-1.7 parts, and further preferably 1.4-1.5 parts. In the present invention, the dispersant preferably includes a high molecular polymer, which is preferably an unsaturated polycarboxylic acid polymer and/or a modified polyurethane; the unsaturated polycarboxylic acid polymer preferably comprises polymethacrylic acid or polymethacrylic acid, and the modified polyurethane preferably comprises organosilicon modified polyurethane or epoxy modified polyurethane.
Based on the mass parts of the graphene-boron carbon nanosheets, the anti-corrosive paint doped with the graphene-boron carbon nanosheets comprises 0.2-0.5 part of defoaming agent, preferably 0.25-0.4 part, and more preferably 0.3-0.36 part. In the present invention, the antifoaming agent preferably includes one or both of a silicone antifoaming agent preferably including one or more of an ACP-1400 antifoaming agent, AFE-1410 antifoaming agent and SigmaA5633 antifoaming agent, and a polyether antifoaming agent preferably including one or both of GP-type glyceryl polyether and polyether-modified polydimethylsiloxane.
Based on the mass parts of the graphene-boron carbon nanosheets, the anti-corrosive paint doped with the graphene-boron carbon nanosheets comprises 0.1-0.5 part of a thickening agent, preferably 0.2-0.43 part of the thickening agent, and further preferably 0.3-0.34 part of the thickening agent. In the present invention, the thickener preferably includes a polyacrylic thickener, which preferably includes one or more of a sodium polyacrylate thickener, a DR-72 thickener, an 8C-490 thickener, and an 8C-410 thickener.
Based on the mass parts of the graphene-boron carbon nanosheets, the doped graphene-boron carbon nanosheet anticorrosive paint provided by the invention comprises 1-5 parts of a flatting agent, preferably 1.5-4 parts, and further preferably 2-3.2 parts. In the present invention, the leveling agent preferably includes one or both of an acrylic leveling agent and an organosilicon leveling agent. The acrylic leveling agent preferably includes one or more of a fluorine-modified acrylic leveling agent, a Klamar-19160 leveling agent, a BYK-354 leveling agent, and a BYK-388 leveling agent, and the silicone leveling agent preferably includes one or more of a polysiloxane leveling agent, a BYK-301 leveling agent, a BYK-300 leveling agent, and a BYK-331 leveling agent.
Based on the mass parts of the graphene-boron carbon nanosheets, the doped graphene-boron carbon nanosheet anticorrosive paint provided by the invention comprises 5-30 parts of a curing agent, preferably 7-25 parts, and further preferably 10-20 parts. In the present invention, the curing agent preferably includes an aliphatic polyamine-based curing agent, which preferably includes one or more of vinyl triamine, trimethylhexamethylene diamine, and m-xylylenediamine.
Based on the mass parts of the graphene-boron carbon nanosheets, the anti-corrosive paint doped with the graphene-boron carbon nanosheets comprises 3-10 parts of water, preferably 4-9 parts of water, and further preferably 5-8 parts of water.
The invention also provides a preparation method of the graphene-boron carbon nanosheet doped anticorrosive coating, which comprises the following steps:
1) firstly mixing the graphene-boron carbon nanosheets with a dispersing agent, a defoaming agent and a thickening agent to obtain graphene-boron carbon nanosheet slurry;
2) secondly mixing the graphene-boron carbon nanosheet slurry obtained in the step 1) with acrylic acid modified alkyd resin, pigment, zinc sulfate, a flatting agent and water to obtain a prefabricated coating;
3) thirdly, mixing the prefabricated coating in the step 2) with a curing agent to obtain the graphene-boron carbon nanosheet doped anticorrosive coating.
According to the invention, the graphene-boron carbon nanosheet slurry is obtained by mixing the graphene-boron carbon nanosheet with a dispersing agent, a defoaming agent and a thickening agent. In the invention, firstly, graphene-boron carbon nanosheets are firstly mixed with a dispersing agent, a defoaming agent and a thickening agent, so that the graphene-boron carbon nanosheets are uniformly dispersed to form graphene-boron carbon nanosheet slurry, and the graphene-boron carbon nanosheets are uniformly dispersed in acrylic acid modified alkyd resin; the invention has no special requirement on the mixing mode, and adopts the conventional mixing mode in the field as long as the mixing is uniform.
And after the graphene-boron carbon nanosheet slurry is obtained, mixing the graphene-boron carbon nanosheet slurry with acrylic acid modified alkyd resin, pigment, zinc sulfate, a leveling agent and water for the second time to obtain the prefabricated coating. The second mixing is not particularly required in the present invention, and a mixing manner conventional in the art is adopted as long as the mixing is uniform.
And after the prefabricated coating is obtained, mixing the prefabricated coating with a curing agent for the third time to obtain the graphene-boron carbon nanosheet doped anticorrosive coating. The invention finally mixes the prefabricated coating and the curing agent for the third time, and the invention has no special requirement on the third mixing and adopts the conventional mixing mode in the field as long as the prefabricated coating and the curing agent are uniformly mixed.
For further illustration of the present invention, the following describes in detail a graphene-boron carbon nanosheet and its application, a doped graphene-boron carbon nanosheet anticorrosive coating and its preparation method provided by the present invention with reference to the accompanying drawings and examples, but they should not be construed as limiting the scope of the present invention.
Example 1
1. Preparing a graphene-boron carbon nanosheet:
mixing 4 parts of boron powder (with the particle size of 5 microns), 2 parts of chitosan and 3 parts of dicyandiamide, heating to 600 ℃ at the heating rate of 2 ℃/min, and preserving heat for 1h to obtain boron carbon nanosheets; mixing 1 part of boron carbon nanosheet, 1 part of graphene oxide and 15 parts of water, heating to 700 ℃ at a heating rate of 5 ℃/min under the protection of argon gas, and preserving heat for 1h to obtain the graphene-boron carbon nanosheet, wherein the flow of the argon gas is 100 sccm.
2. Preparing the graphene-boron carbon nano sheet doped anticorrosive coating:
firstly, mixing 2 parts of graphene-boron carbon nanosheet, 1 part of polymethyl butenoic acid, 0.2 part of GP-type glycerol polyether and 0.1 part of sodium polyacrylate to obtain graphene-boron carbon nanosheet slurry; then mixing the graphene-boron carbon nanosheet slurry with 10 parts of acrylic acid modified alkyd resin, 5 parts of titanium dioxide, 5 parts of zinc sulfate, 1 part of fluorine modified acrylic acid and 3 parts of water to obtain a prefabricated coating; and finally, mixing the prefabricated coating with 5 parts of vinyl triamine to obtain the graphene-boron carbon nano sheet doped anticorrosive coating.
Observing the graphene-boron carbon nanosheet prepared in the embodiment 1 through an electron microscope to obtain a figure 1, wherein the figure 1 shows that the graphene-boron carbon nanosheet prepared in the invention has a layer-by-layer stacked lamellar structure.
Example 2
1. Preparing a graphene-boron carbon nanosheet:
mixing 4 parts of boron powder (with the particle size of 10 microns), 2 parts of chitosan and 3 parts of dicyandiamide, heating to 700 ℃ at the heating rate of 10 ℃/min, and preserving heat for 3 hours to obtain boron carbon nanosheets; mixing 1 part of boron carbon nanosheet, 1 part of graphene oxide and 15 parts of water, heating to 800 ℃ at a heating rate of 10 ℃/min under the protection of nitrogen, and preserving heat for 15 hours to obtain the graphene-boron carbon nanosheet, wherein the flow rate of nitrogen is 200 sccm.
2. Preparing the graphene-boron carbon nano sheet doped anticorrosive coating:
firstly, mixing 10 parts of graphene-boron carbon nanosheet, 1.5 parts of modified polyurethane, 0.3 part of polyether modified polydimethylsiloxane and 0.3 part of sodium polyacrylate to obtain graphene-boron carbon nanosheet slurry; then mixing the graphene-boron carbon nanosheet slurry with 20 parts of acrylic acid modified alkyd resin, 10 parts of titanium dioxide, 10 parts of zinc sulfate, 3 parts of BYK-301 flatting agent and 5 parts of water to obtain a prefabricated coating; and finally, mixing the prefabricated coating with 5 parts of trimethyl hexamethylene diamine to obtain the graphene-boron carbon nano sheet doped anticorrosive coating.
Example 3
1. Preparing a graphene-boron carbon nanosheet:
mixing 4 parts of boron powder (the particle size is 20 microns), 2 parts of chitosan and 3 parts of dicyandiamide, heating to 800 ℃ at the heating rate of 15 ℃/min, and preserving heat for 5 hours to obtain boron carbon nanosheets; mixing 1 part of boron carbon nanosheet, 1 part of graphene oxide and 19 parts of water, heating to 1000 ℃ at a heating rate of 20 ℃/min under the protection of argon gas, and preserving heat for 30 hours to obtain the graphene-boron carbon nanosheet, wherein the flow rate of the argon gas is 300 sccm.
2. Preparing the graphene-boron carbon nano sheet doped anticorrosive coating:
firstly, mixing 10 parts of graphene-boron carbon nanosheet, 2 parts of polymethacrylic acid dispersing agent, 0.5 part of polyether modified polydimethylsiloxane and 0.5 part of sodium polyacrylate to obtain graphene-boron carbon nanosheet slurry; then mixing the graphene-boron carbon nanosheet slurry with 30 parts of acrylic acid modified alkyd resin, 20 parts of titanium dioxide, 25 parts of zinc sulfate, 5 parts of BYK-300 flatting agent and 10 parts of water to obtain a prefabricated coating; and finally, mixing the prefabricated coating with 30 parts of m-xylylenediamine to obtain the graphene-boron carbon nano sheet doped anticorrosive coating.
The performance test of the doped graphene-boron carbon nanosheet anticorrosive coatings obtained in the embodiments 1-3 is carried out according to the national standard HG/T4759-2014, and the results are listed in Table 1.
TABLE 1 examples 1-3 Properties of graphene-boron carbon nanoplate doped anticorrosion coatings
As can be seen from table 1, the graphene-boron-doped carbon nanosheet anticorrosive coatings prepared in examples 1 to 3 have water resistance, acid resistance, alkali resistance, humidity resistance, salt spray resistance and impact resistance all obviously superior to national standards.
Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (8)
1. The graphene-boron carbon nanosheet doped anticorrosive paint comprises the following components in parts by weight:
2-10 parts of graphene-boron carbon nanosheets;
10-30 parts of acrylic acid modified alkyd resin;
5-20 parts of pigment;
5-25 parts of zinc sulfate;
1-2 parts of a dispersing agent;
0.2-0.5 part of defoaming agent;
0.1-0.5 part of thickening agent;
1-5 parts of a leveling agent;
5-30 parts of a curing agent;
3-10 parts of water;
the graphene-boron carbon nanosheet is prepared by a preparation method comprising the following steps:
s1, mixing boron, chitosan and dicyandiamide, heating for the first time, and carrying out first self-assembly to obtain boron-carbon nanosheets;
s2, mixing the boron carbon nanosheets, graphene oxide and water, then heating for the second time, and carrying out second self-assembly to obtain graphene-boron carbon nanosheets;
the graphene-boron carbon nanosheet has a layer-by-layer stacked lamellar structure.
2. The graphene-boron carbon nanosheet doped anticorrosive coating of claim 1, wherein the mass ratio of boron to chitosan to dicyandiamide in step S1 is 3.8-4.2: 1.8-2.2: 2.8-3.2.
3. The graphene-boron-doped carbon nanosheet anticorrosive coating of claim 1 or 2, wherein the temperature of the first self-assembly in step S1 is 600-800 ℃.
4. The graphene-boron-doped carbon nanosheet anticorrosive coating of claim 1, wherein the mass ratio of the boron-carbon nanosheets, the graphene oxide and the water in step S2 is 1:1: 10-25.
5. The graphene-boron-doped carbon nanosheet anticorrosive coating of claim 1 or 4, wherein the temperature of the second self-assembly in step S2 is 700-1000 ℃.
6. The graphene-boron-doped carbon nanosheet anticorrosive coating of claim 1, wherein the dispersant is a high molecular polymer, and the high molecular polymer is an unsaturated polycarboxylic acid polymer and/or a modified polyurethane.
7. The doped graphene-boron carbon nanosheet anticorrosive coating of claim 1, wherein the curing agent is an aliphatic polyamine curing agent that is one or more of vinyl triamine, trimethyl hexanediamine, and m-xylylenediamine.
8. The preparation method of the graphene-boron-doped carbon nanosheet anticorrosive coating as claimed in any one of claims 1 to 7, comprising the steps of:
1) firstly mixing the graphene-boron carbon nanosheets with a dispersing agent, a defoaming agent and a thickening agent to obtain graphene-boron carbon nanosheet slurry;
2) secondly mixing the graphene-boron carbon nanosheet slurry obtained in the step 1) with acrylic acid modified alkyd resin, pigment, zinc sulfate, a flatting agent and water to obtain a prefabricated coating;
3) thirdly, mixing the prefabricated coating in the step 2) with a curing agent to obtain the graphene-boron carbon nanosheet doped anticorrosive coating.
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