CN115785780A - Graphene electrothermal coating - Google Patents
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- CN115785780A CN115785780A CN202211478164.6A CN202211478164A CN115785780A CN 115785780 A CN115785780 A CN 115785780A CN 202211478164 A CN202211478164 A CN 202211478164A CN 115785780 A CN115785780 A CN 115785780A
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Abstract
The invention relates to a graphene electrothermal coating, and belongs to the technical field of electrothermal coatings. The electric heating coating is mainly prepared from resin emulsion, a solvent, conductive carbon black slurry, graphene slurry, carbon nanotube slurry and an auxiliary agent; the particle size of carbon black in the conductive carbon black slurry is less than or equal to 300nm; the graphene sheet diameter in the graphene slurry is less than or equal to 20 micrometers; the diameter of the carbon nano tube in the carbon nano tube slurry is 3-50nm, and the length of the carbon nano tube in the carbon nano tube slurry is 3-50 mu m; the mass ratio of the solid in the resin emulsion to the solid in the conductive carbon black slurry to the solid in the graphene slurry to the solid in the carbon nanotube slurry is (30-65). The electric heating material coated by the electric heating coating has excellent electric and thermal conductivity and low room temperature resistivity, can be heated from room temperature to 60-100 ℃ within 240s only by 24V voltage, and can generate heat rapidly and uniformly.
Description
Technical Field
The invention relates to a graphene electrothermal coating, and belongs to the technical field of electrothermal coatings.
Background
The electrothermal coating is a novel functional coating developed on the basis of conductive coatings, is widely used at present, is most commonly used in the field of civil electric heating, and is used as an electrothermal conversion device to convert electric energy into heat for heating. The electric heating coating has flexible construction process, can be made into heating equipment in different forms, such as a floor heating film, an electric blanket, an electric heating wall picture and the like, so as to meet the requirements of different use scenes. In addition, the method is widely applied to snow removal and deicing of roads, pipeline heating and heat preservation, industrial production and the like.
The electric heating paint can be divided into additive type electric heating paint and non-additive type electric heating paint according to whether the conductive material is required to be added or not. The base material of the additive type electric heating coating does not have the electric conduction capability, and the conductive filler or the conductive additive is required to be added. The base material of the non-additive electrothermal paint can conduct electricity, and other conducting materials do not need to be added. At present, the more mature additive type electrothermal coating systems can be divided into three types, namely carbon system, metal powder system and composite system. Among them, the carbon-based electric heating coating has the advantages of fast temperature rise, stable heating temperature, strong adhesive force, low construction and maintenance cost, low power consumption, low use cost and the like, and is rapidly developed in recent years. The traditional carbon-based electric heating coating is composed of four parts, namely a binder, an electric and heat conductive filler, other additives and a solvent, and is mainly based on an oil system, so that the preparation process is usually accompanied by certain environmental pollution, and the environmental protection property is poor. And because the main body of the carbon conductive filler is carbon, the carbon conductive filler belongs to a non-polar material, the carbon conductive filler has poor wettability and uneven dispersion in water, and the prepared electric heating film has uneven heating temperature and low heating efficiency. In view of the above-mentioned drawbacks of the conventional carbon-based electric heating coating, chinese patent No. CN108084823A discloses a novel electric heating coating, which comprises: 10-20 parts of graphite; 2-10 parts of conductive carbon black; 10-15 parts of carbon nanotube dispersion liquid; 7-15 parts of graphene dispersion liquid; 0.5-2 parts of silicon carbide whisker; 0.5-2 parts of tin oxide; 0.5-2 parts of nickel-iron spinel; 16-37 parts of a water-based resin linking agent; 20-40 parts of water; and 2.3-8 parts of an auxiliary agent. The electrothermal film made of the electrothermal paint has the advantages of high heating uniformity, high electrothermal conversion efficiency and the like, can be used as a heating product for buildings, and can be further processed into various electrothermal heating products. However, the integral resistance of the conductive coating is higher, so that the temperature of the prepared electrothermal film is slowly raised at low voltage and is difficult to be raised to higher temperature, and the market demand can not be met.
Disclosure of Invention
The invention aims to provide a graphene electrothermal coating, and the prepared electrothermal coating can be rapidly heated at low voltage.
In order to achieve the purpose, the graphene electrothermal paint adopts the technical scheme that:
a graphene electrothermal coating is mainly prepared from the following raw materials: the conductive carbon black-carbon composite material comprises resin emulsion, conductive carbon black slurry, graphene slurry, carbon nanotube slurry and an auxiliary agent; the particle size of the conductive carbon black in the conductive carbon black slurry is less than or equal to 300nm, and the sheet size of the graphene in the graphene slurry is less than or equal to 20 mu m; the diameter of the carbon nano tube is 3-50nm, and the length of the carbon nano tube is 3-50 mu m; the mass ratio of the solid matters in the resin emulsion, the solid matters in the conductive carbon black slurry, the solid matters in the graphene slurry and the solid matters in the carbon nanotube slurry is 30-65.
Graphene in the graphene electrothermal coating has an ultra-high specific surface area, remarkable electronic characteristics, excellent thermal stability and high mechanical strength, which are beneficial to the service performance of the electrothermal coating. On one hand, the electric heating material formed by the graphene electric heating coating after coating has excellent electric and heat conduction characteristics and low room temperature resistivity, can be heated from room temperature to 60-100 ℃ within 240 seconds only by 24 voltage, and can generate heat rapidly and uniformly. Meanwhile, due to the existence of graphene, the electric heating material can release 9-14 μm of far infrared waves in the electric heating process, and the far infrared waves are matched with the infrared wavelengths released by a human body, so that the micro-circulation of the human body can be well excited, the immunity is improved, the brain function is improved, the activity of protein in the body is excited, and the electric heating material is beneficial to health.
In addition, the conductive carbon black, the carbon nano tube and the graphene are compounded for use, so that the overall price of the product is effectively reduced; meanwhile, a more complex conductive network is formed, and compared with a single graphene conductive system, the graphene conductive network has better electrothermal stability; once a single conductive system is damaged, thermal runaway is easy to occur, and the existence of multiple conductive networks endows the conductive system with higher use safety.
Furthermore, the mass ratio of the solid matters in the resin emulsion, the solid matters in the conductive carbon black slurry, the solid matters in the graphene slurry and the solid matters in the carbon nanotube slurry is 45-60.
Further, the mass ratio of the resin emulsion to the conductive carbon black slurry to the graphene slurry to the carbon nanotube slurry is 100 to 80 to 250; the solids content of the resin emulsion is from 30 to 65%, for example from 45 to 60%. The solid content of the conductive carbon black slurry is 10 to 30%, for example, 15 to 20%. The solid content of the graphene slurry is 15 to 30%, for example, 15 to 20%. The solid content of the carbon nanotube slurry is 3 to 10%, for example, 4 to 8%.
Further, the particle size of the conductive carbon black is 35 to 75nm, for example, 35 to 50nm or 50 to 75nm; the sheet diameter of the graphene is 3 to 20 μm, preferably 3 to 15 μm, for example, the sheet diameter is 3 to 10 μm, 5 to 10 μm, or 10 to 15 μm; the carbon nanotubes have a diameter of 8 to 20nm and a length of 3 to 50 μm, for example, the carbon nanotubes have a diameter of 10 to 20nm, a length of 10 to 30 μm or a diameter of 8 to 15nm, a length of 20 to 50 μm or a diameter of 10 to 15nm and a length of 3 to 12 μm.
Further, the number of graphene layers in the graphene slurry is 1-10. The carbon nano tube is a multi-wall carbon nano tube. For example, the number of layers of the multi-walled carbon nanotube may be 5-20. The dispersing agents of the conductive carbon black, the graphene slurry and the carbon nano tube slurry are all water. When the conductive carbon black slurry, the graphene slurry and the carbon nanotube slurry are coated and dried to form a film with a thickness of 20 microns, the sheet resistances measured by a four-probe resistivity tester are less than or equal to 200 omega/cm, for example, the sheet resistance of the film with the thickness of 20 microns made of the conductive carbon black slurry is 15-200 omega/cm, the sheet resistance of the film with the thickness of 20 microns made of the graphene slurry is 3-35 omega/cm, and the sheet resistance of the film with the thickness of 20 microns made of the carbon nanotube slurry is 5-50 omega/cm.
It is understood that the resin emulsion in the raw materials is an aqueous resin emulsion, which serves as a resin binder. In order to improve the thermal shock resistance of the electric heating material prepared from the graphene electric heating coating, the softening temperature of a polymer formed by the resin in the resin emulsion after the graphene electric heating coating is coated and cured is more than or equal to 120 ℃. Further, the resin emulsion is one or any combination of alkyd resin emulsion, polyurethane emulsion, acrylic emulsion, acrylate emulsion, silicone emulsion and epoxy resin emulsion. Further, the acrylate emulsion is one or any combination of pure acrylic emulsion, styrene-acrylic emulsion and silicone-acrylic emulsion. Further, the aqueous resin emulsion may be a one-component aqueous resin emulsion or a two-component aqueous resin emulsion. It is understood that the one-component aqueous resin emulsion is a self-crosslinking aqueous resin emulsion.
Further, the raw materials also comprise a solvent. When the solid contents of the resin emulsion, the conductive carbon black slurry, the graphene slurry and the carbon nanotube slurry are low, no additional solvent is needed to be added, and the raw materials are uniformly mixed to obtain the graphene conductive coating; when the solid contents of the resin emulsion, the conductive carbon black slurry, the graphene slurry and the carbon nanotube slurry are high, a solvent is additionally used. The solvent is water. The water is used as a solvent, so that the environmental friendliness of the graphene electrothermal coating can be improved. Further, the mass ratio of the solvent to the solid content in the resin emulsion is 0 to 25, preferably 0 to 25, 45 to 60, for example 10 to 25.
Further, the mass ratio of the auxiliary agent to the solid content in the resin emulsion is 1 to 20, for example 9.5 to 10.5. The auxiliary agent comprises a leveling agent, a defoaming agent and a thickening agent.
Still further, the auxiliaries are leveling agents, antifoaming agents and thickeners. The mass ratio of the leveling agent, the defoaming agent, the thickening agent and the solid in the resin emulsion is 1-5. Further, the leveling agent is one or any combination of an acrylic leveling agent, an acrylate leveling agent and an organic silicon leveling agent. The defoaming agent is an organic silicon defoaming agent and/or a polyether modified organic silicon defoaming agent. The thickening agent is an acrylic thickening agent and/or a polyurethane thickening agent.
Furthermore, the main component of the acrylic leveling agent is acrylic homopolymer and/or acrylic copolymer, and the molecular weight of the acrylic homopolymer and the molecular weight of the acrylic copolymer are both 6000 to 20000. The main component of the organic silicon leveling agent is polydimethylsiloxane and/or polyether modified polydimethylsiloxane. The main component of the organic silicon type defoaming agent is polydimethylsiloxane. The polyether modified organic silicon type defoaming agent is one or any combination of an amino polyether organic silicon defoaming agent, an alkoxy polyether organic silicon defoaming agent and a hydroxyl polyether organic silicon defoaming agent; the polyacrylic acid thickener is a homopolymer or copolymer of more than two of acrylic acid, maleic acid or maleic anhydride, methacrylic acid, acrylate, styrene, acrylamide and acrylate; the polyurethane thickener contains characteristic functional groups of carbamate in the polyurethane compound, and the molecular weight is less than or equal to 10W.
For example, the leveling agent is one or any combination of a German bike BYK-346 organic silicon leveling agent, a German bike BYK-300 organic silicon leveling agent and a German bike BYK-381 acrylate leveling agent, and the defoaming agent is one or any combination of a German bike BYK-024 organic silicon defoaming agent, a German bike BYK-025 organic silicon defoaming agent and a Dow Corning DC-68 organic silicon defoaming agent; the thickener is a Pasf 1191 associative polyurethane thickener and/or a NY-935 aqueous acrylic acid associative thickener in Foshan City.
The preparation method of the graphene electrothermal coating comprises the following steps: mixing the above materials uniformly. According to the preparation method of the graphene electrothermal coating, the resin emulsion, the solvent, the conductive carbon black slurry, the graphene slurry, the carbon nanotube slurry and the auxiliary agent are uniformly mixed, so that the preparation method is simple in process and convenient to popularize and apply.
Further, the step of uniformly mixing is to uniformly mix the solvent and the auxiliary agent, then uniformly mix the solvent and the resin emulsion, and then add the conductive carbon black slurry, the graphene slurry and the carbon nanotube slurry and uniformly mix the conductive carbon black slurry, the graphene slurry and the carbon nanotube slurry. For example, when the solvent and the auxiliary agent are mixed, the mixture can be stirred for 10 to 30min at the rotating speed of 500 to 1500 r/min; when the mixture is evenly mixed with the resin emulsion, the mixture can be stirred for 10 to 30min at the rotating speed of 300 to 1000 r/min; when the conductive carbon black slurry, the graphene slurry and the carbon nano tube slurry are added and mixed uniformly, the mixture can be stirred for 30-60 min at the rotating speed of 300-1000 r/min.
When the graphene electrothermal coating is used, an electrothermal coating or an electrothermal film with a designed shape and specification can be prepared by adopting screen printing, gravure printing and other modes. In the electrothermal film or the electrothermal film prepared by the graphene electrothermal coating, different conductive materials are distributed in a staggered manner to form a compact and stable conductive network, so that the graphene electrothermal coating has excellent conductive characteristics, the room temperature resistivity of the material is greatly reduced, and meanwhile, the carbon-based filler has excellent electrothermal conversion efficiency and high electric energy conversion rate, can be heated to 60-100 ℃ from the room temperature within 240s only by 24V at low voltage, and can generate heat rapidly and uniformly.
Detailed Description
The technical solution of the present invention will be further described with reference to the following embodiments.
The conductive carbon black slurry used in the following examples was prepared by uniformly dispersing conductive carbon black in water, the graphene slurry was prepared by uniformly dispersing graphene in water, and the carbon nanotube slurry was prepared by uniformly dispersing carbon nanotubes in water. When the conductive carbon black slurry, the graphene slurry and the carbon nano tube slurry are coated and dried to form a film with the thickness of 20 microns, the square resistance measured by a four-probe resistivity tester is less than or equal to 200 omega/cm. Specifically, when the conductive carbon black slurry is coated and dried to form a film with the thickness of 20 micrometers, the square resistance measured by a four-probe resistivity tester is 186 Ω/cm, when the graphene slurry is coated and dried to form a film with the thickness of 20 micrometers, the square resistance measured by the four-probe resistivity tester is 25 Ω/cm, and when the carbon nanotube slurry is coated and dried to form a film with the thickness of 20 micrometers, the square resistance measured by the four-probe resistivity tester is 87 Ω/cm.
Example 1
The graphene electrothermal coating is prepared from the following raw materials in parts by weight: 100 parts of resin emulsion, 25 parts of water, 2.5 parts of flatting agent, 3 parts of defoaming agent, 5 parts of thickening agent, 180 parts of conductive carbon black slurry, 5 parts of graphene slurry and 50 parts of carbon nanotube slurry.
The resin emulsion adopted in the embodiment is Cantonese panax notoginseng MR-789 type polyurethane emulsion, and the solid content is 60 percent; the leveling agent is a German bike BYK-346 organic silicon leveling agent, the defoaming agent is a German bike BYK-024 organic silicon defoaming agent, and the thickening agent is a Pasteur 1191 association type polyurethane thickening agent; the solid content of the conductive carbon black slurry is 18%, and the particle size of the carbon black in the slurry is 35-50nm; the solid content of the graphene slurry is 18%, the sheet diameter of graphene in the slurry is 5-10 mu m, and the number of layers is 1-10; the solid content of the carbon nano tube slurry is 5%, the carbon nano tubes in the slurry are multi-wall carbon nano tubes, the diameter is 10-20nm, and the length is 10-30 mu m.
The preparation method of the graphene electrothermal paint comprises the following steps: adding water, a defoaming agent and a flatting agent into a high-speed stirrer, strongly dispersing for 30min at a stirring speed of 500r/min, and uniformly mixing; then continuing to add the resin emulsion, dispersing for 20min at the stirring speed of 650r/min and uniformly mixing; and adding conductive carbon black slurry, carbon nanotube slurry and graphene slurry, and dispersing for 30min and uniformly mixing at a stirring speed of 1000r/min to obtain the uniformly dispersed graphene electrothermal coating.
Example 2
The graphene electrothermal coating is prepared from the following raw materials in parts by weight: 100 parts of resin emulsion, 4 parts of flatting agent, 3.5 parts of defoaming agent, 2 parts of thickening agent, 100 parts of conductive carbon black slurry, 100 parts of graphene slurry and 30 parts of carbon nanotube slurry.
The resin emulsion adopted in the embodiment is Cantonese notoginseng MR-875 type polyurethane emulsion, and the solid content is 45 percent; the leveling agent is a German bike BYK-300 organic silicon leveling agent, the defoaming agent is a German bike BYK-025 organic silicon defoaming agent, and the thickening agent is a Pasteur 1191 association type polyurethane thickening agent; the solid content of the conductive carbon black slurry is 15%, and the particle size of the conductive carbon black in the slurry is 35-50nm; the solid content of the graphene slurry is 15%, the sheet diameter of graphene in the slurry is 10-15 mu m, and the number of layers is 1-10; the solid content of the carbon nano tube slurry is 8 percent, the carbon nano tubes in the slurry are multi-wall carbon nano tubes, the diameter is 8-15nm, and the length is 20-50 mu m.
The preparation method of the graphene electrothermal paint comprises the following steps: adding water, a defoaming agent and a flatting agent into a high-speed stirrer, strongly dispersing for 20min at a stirring speed of 1000r/min, and uniformly mixing; then continuing to add the resin emulsion, dispersing for 1min at the stirring speed of 1000r/min and uniformly mixing; and adding conductive carbon black slurry, carbon nanotube slurry and graphene slurry, and dispersing at a stirring speed of 300r/min for 60min and uniformly mixing to obtain the uniformly dispersed graphene electrothermal coating.
Example 3
The graphene electrothermal coating is prepared from the following raw materials in parts by weight: 100 parts of resin emulsion, 10 parts of water, 3 parts of flatting agent, 3 parts of defoaming agent, 3.5 parts of thickening agent, 100 parts of conductive carbon black slurry, 40 parts of graphene slurry and 200 parts of carbon nanotube slurry.
The resin emulsion adopted in the embodiment is Hanhua chemical water-based acrylic emulsion SX-1420, and the solid content is 46.2%; the leveling agent is a German bike BYK-381 acrylic ester leveling agent, the defoaming agent is a Dow Corning DC-68 organic silicon defoaming agent, the thickening agent is a NY-935 aqueous acrylic acid associated thickening agent in Nono chemical engineering in Foshan City, the solid content of the conductive carbon black slurry is 20%, and the particle size of the carbon black is 50-75nm; the solid content of the graphene slurry is 20%, the sheet diameter of graphene in the slurry is 3-10 mu m, and the number of layers is 1-10; the solid content of the carbon nanotube slurry is 4%, the carbon nanotubes in the slurry are multi-walled carbon nanotubes, the diameter of the multi-walled carbon nanotubes is 10-15nm, and the length of the multi-walled carbon nanotubes is 3-12 mu m.
The preparation method of the graphene electrothermal coating comprises the following steps: adding water, a defoaming agent and a flatting agent into a high-speed stirrer, strongly dispersing for 10min at a stirring speed of 1500r/min, and uniformly mixing; then, continuously adding the resin emulsion, and dispersing for 30min and uniformly mixing at the stirring speed of 300 r/min; and adding conductive carbon black slurry, carbon nanotube slurry and graphene slurry, and dispersing for 45min and uniformly mixing at a stirring speed of 650r/min to obtain the uniformly dispersed graphene electrothermal coating.
Comparative example 1
The electrothermal coating of the present comparative example is different from the graphene electrothermal coating of example 1 only in that: the electrothermal coating of this comparative example omits the carbon nanotube slurry in the graphene electrothermal coating of example 1.
Comparative example 2
The electrothermal coating of this comparative example differs from the graphene electrothermal coating of example 1 only in that: the resin emulsion adopted by the electric heating coating of the comparative example is EVA emulsion with the solid content of 50 percent.
Comparative example 3
The electrothermal coating of this comparative example differs from the graphene electrothermal coating of example 1 only in that: the solid content of the graphene slurry in the electrothermal coating of the embodiment 2 is reduced to 5% by the electrothermal coating of the comparative example.
Examples of the experiments
The graphene electrothermal coatings of examples 1 to 3 and comparative examples 1 to 3 were respectively used to prepare electrothermal materials according to the following methods: treating the PET film by using alcohol, removing dirt on the surface, and drying for later use; the graphene electrothermal coating is transferred to a PET film by a screen printing method, then the PET film is placed in an oven to be dried for 30min at 105 ℃, then the drying oven is stored for 48h at room temperature until the drying oven is completely cured, an electrothermal film with the length multiplied by the width multiplied by the thickness of 272.75mm multiplied by 115mm multiplied by 30 mu m is formed on the PET film, a conductive copper strip is assembled on two sides of the electrothermal film along the length direction, a lead is welded, and then the electrothermal film coated on the PET film is plastically packaged by another PET film to form an interlayer structure. The softening temperature of the polymer formed by curing the resin emulsion in the electric heating film formed by the graphene electric heating coatings in the embodiments 1-3 is more than or equal to 120 ℃, and the softening temperature of the polymer formed by curing the resin emulsion in the electric heating film formed by the graphene electric heating coatings in the comparative example 2 is less than 120 ℃.
The prepared electric heating materials are utilized to test the room temperature resistance, the electric heating characteristics, the electric resilience, the adhesive force, the thermal shock resistance and the humidity and heat resistance of the electric heating films formed on the PET film by the graphene electric heating coatings of the examples 1 to 3 and the comparative examples 1 to 3; the test method of each performance is respectively as follows:
resistance at room temperature: measuring by using a universal meter;
testing the electric heating property and the electric recovery property: the surface of the electric heating film is connected with a thermocouple, 18V, 20V and 24V voltages are applied to the electric heating film respectively, and the change of the surface temperature of the electric heating film along with time after the voltage is connected is recorded by an Agilent data acquisition instrument; powering on and heating to a stable temperature for multiple times, then powering off, and recording the room temperature resistance fluctuation value;
and (3) testing the adhesive force: performed according to ASTM D3359-2002;
and (3) thermal shock resistance test: circularly heating and cooling at-40-110 ℃, maintaining at-40 ℃ for 5min, maintaining at 110 ℃ for 10min, and circularly repeating for 100 times to observe whether the coating is deteriorated, damaged or fallen off;
1000h damp-heat resistance test: the method is carried out according to GB/T2423.50-2012.
And (3) testing the heating uniformity: 6 points are randomly selected on the electrothermal film to test the temperature, the average temperature is calculated and the temperature difference is calculated.
The test results are shown in Table 1.
TABLE 1 Performance test results
Claims (10)
1. The graphene electrothermal coating is characterized in that: the health-care food is mainly prepared from the following raw materials: the conductive carbon black-carbon composite material comprises resin emulsion, a solvent, conductive carbon black slurry, graphene slurry, carbon nanotube slurry and an auxiliary agent; the particle size of the conductive carbon black in the conductive carbon black slurry is less than or equal to 300nm, and the sheet size of the graphene in the graphene slurry is less than or equal to 20 mu m; the diameter of the carbon nano tube in the carbon nano tube slurry is 3-50nm, and the length of the carbon nano tube in the carbon nano tube slurry is 3-50 mu m; the mass ratio of the solid matters in the resin emulsion, the solid matters in the conductive carbon black slurry, the solid matters in the graphene slurry and the solid matters in the carbon nanotube slurry is 30-65.
2. The graphene electrothermal paint of claim 1, wherein: the mass ratio of the resin emulsion to the conductive carbon black slurry to the graphene slurry to the carbon nanotube slurry is (100-250).
3. The graphene electrothermal paint of claim 2, wherein: the solid content of the resin emulsion is 30-65%; the solid content of the conductive carbon black slurry is 10-30%; the solid content of the graphene slurry is 15-30%; the solid content of the carbon nano tube slurry is 3-10%.
4. The graphene electrothermal paint according to claim 1 or 2, wherein: the particle size of the conductive carbon black is 35-75 nm; the sheet diameter of the graphene is 3-20 mu m; the diameter of the carbon nano tube is 8-20 nm.
5. The graphene electrothermal coating according to claim 1 or 2, wherein: the number of graphene layers in the graphene slurry is 1-10; the carbon nano tube is a multi-wall carbon nano tube.
6. The graphene electrothermal paint according to claim 1 or 2, wherein: the resin emulsion is one or any combination of alkyd resin emulsion, polyurethane emulsion, acrylic emulsion, acrylate emulsion, organic silicon emulsion and epoxy resin emulsion.
7. The graphene electrothermal coating according to claim 1 or 2, wherein: the raw materials also comprise a solvent; the solvent is water, and the mass ratio of the solvent to the solid in the resin emulsion is 0-25.
8. The graphene electrothermal coating according to claim 1 or 2, wherein: the mass ratio of the auxiliary agent to the solid in the resin emulsion is 1-20; the auxiliary agent comprises a leveling agent, a defoaming agent and a thickening agent.
9. The graphene electrothermal coating according to claim 8, wherein: the auxiliary agent is a flatting agent, a defoaming agent and a thickening agent; the mass ratio of the flatting agent to the defoaming agent to the thickening agent to the solid in the resin emulsion is 1-5: 30 to 65 parts; the leveling agent is one or any combination of an acrylic leveling agent, an acrylate leveling agent and an organic silicon leveling agent; the defoaming agent is an organic silicon defoaming agent and/or a polyether modified organic silicon defoaming agent; the thickening agent is a polyacrylic thickening agent and/or a polyurethane thickening agent.
10. The graphene electrothermal coating according to claim 9, wherein: the main component of the acrylic leveling agent is acrylic acid homopolymer and/or acrylic acid copolymer; the main component of the organic silicon flatting agent is polydimethylsiloxane and/or polyether modified polydimethylsiloxane; the main component of the organic silicon type defoaming agent is polydimethylsiloxane, and the polyether modified organic silicon type defoaming agent is one or any combination of an amino polyether organic silicon defoaming agent, an alkoxy polyether organic silicon defoaming agent and a hydroxyl polyether organic silicon defoaming agent; the polyacrylic acid thickener is a homopolymer or copolymer of more than two of acrylic acid, maleic acid or maleic anhydride, methacrylic acid, acrylate, styrene, acrylamide and acrylate.
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