Search

CN-121975425-A - High-performance wire enamel based on graphene and preparation method thereof

CN121975425ACN 121975425 ACN121975425 ACN 121975425ACN-121975425-A

Abstract

The invention relates to a graphene-based high-performance wire enamel and a preparation method thereof, belonging to the technical field of wire enamel, and comprising, by weight, 100 parts of a basic wire enamel resin solution, 2-15 parts of a functionalized modified graphene dispersion liquid, 10-30 parts of a diluting solvent and 0.1-1 part of a leveling aid, wherein the functionalized modified graphene dispersion liquid comprises functionalized modified graphene, graphene oxide is taken as a framework, an insulating siloxane network layer is coated on the surface of the graphene oxide, and an active isocyanate group is grafted on the surface of the insulating siloxane network layer.

Inventors

  • LIU ZIJIAN
  • LIU YONGJUN

Assignees

  • 安徽精隆新材料股份有限公司

Dates

Publication Date
20260505
Application Date
20260316

Claims (9)

  1. 1. The graphene-based high-performance wire enamel is characterized by comprising, by weight, 100 parts of basic wire enamel resin liquid, 2-15 parts of functionalized modified graphene dispersion liquid, 10-30 parts of diluting solvent and 0.1-1 part of leveling aid, wherein the functionalized modified graphene dispersion liquid comprises functionalized modified graphene, the functionalized modified graphene takes graphene oxide as a framework, the surface of the graphene oxide is coated with an insulating siloxane network layer, and the surface of the insulating siloxane network layer is grafted with active isocyanate groups.
  2. 2. The graphene-based high-performance wire enamel of claim 1, wherein the base wire enamel is one of a polyamide imide resin solution, a polyester imide resin solution or a polyimide resin solution, and the solid content of the base wire enamel is 25% -35%.
  3. 3. The graphene-based high-performance wire enamel of claim 1, wherein the diluent solvent is selected from one or more of N-methylpyrrolidone, N-dimethylformamide, N-dimethylacetamide and m-cresol, and the solid content of the functionalized modified graphene dispersion liquid is 3% -8%.
  4. 4. The high-performance wire enamel based on graphene of claim 1, wherein the insulating siloxane network layer is a cohydrolytic condensation product of tetraethoxysilane and an aminosilane coupling agent, and the reactive isocyanate group is a grafting product of a reaction of a diisocyanate monomer and an amino group on the aminosilane coupling agent.
  5. 5. The preparation method of the graphene-based high-performance wire enamel of any one of claims 1 to 4 is characterized by comprising the steps of dispersing graphene oxide powder in a strong polar aprotic solvent in an ultrasonic manner, adding deionized water, then dropwise adding tetraethoxysilane and an aminosilane coupling agent, reacting at a constant temperature by utilizing the weak alkaline self-catalysis effect of the aminosilane coupling agent to obtain an amino insulated graphene slurry, adding an azeotropic solvent into the amino insulated graphene slurry, heating to perform azeotropic distillation reflux, removing water and micromolecular alcohol generated by hydrolysis through a water separator, then evaporating the azeotropic solvent, cooling to room temperature to obtain an anhydrous slurry, adding diisocyanate monomers into the anhydrous slurry under the protection of nitrogen, reacting at constant temperature to obtain a functional modified graphene dispersion, adding the functional modified graphene dispersion into a basic resin liquid, adding a diluting solvent and an auxiliary agent, performing high-speed shearing dispersion, filtering and vacuum defoaming to obtain the graphene-based high-performance wire enamel.
  6. 6. The preparation method of the graphene-based high-performance wire enamel, which is disclosed in claim 5, is characterized in that in the step of obtaining the aminated insulated graphene slurry, the strong polar aprotic solvent is N-methyl pyrrolidone, the aminosilane coupling agent is 3-aminopropyl triethoxysilane, and the reaction is carried out at a constant temperature of 50-70 ℃ for 6-12 hours.
  7. 7. The method for preparing the graphene-based high-performance wire enamel of claim 5, wherein in the step of obtaining anhydrous slurry, the azeotropic solvent is toluene or xylene, and the temperature for azeotropic distillation reflux is 110-130 ℃.
  8. 8. The method for preparing the graphene-based high-performance wire enamel of claim 5, wherein in the step of obtaining the functionalized modified graphene dispersion liquid, the diisocyanate monomer is selected from diphenylmethane diisocyanate, toluene-2, 4-diisocyanate or toluene-2, 6-diisocyanate, and the constant temperature reaction is carried out at 60-80 ℃ for 2-4 hours.
  9. 9. The method for preparing the graphene-based high-performance wire enamel of claim 5, wherein in the step of obtaining the graphene-based high-performance wire enamel, the high-speed shearing dispersion speed is 1000-3000 rpm, the time is 1-2 hours, and the filtering is performed by a 200-mesh filter screen.

Description

High-performance wire enamel based on graphene and preparation method thereof Technical Field The invention relates to the field of wire enamel, in particular to a graphene-based high-performance wire enamel and a preparation method thereof. Background In the current high-power density motor operation environment, the enameled wire is used as a core component, and the paint on the surface of the enameled wire is required to bear complex heating and electric insulation tests; In order to improve heat dissipation performance, the prior proposal tries to introduce a heat conduction filler into base resin, while the conventional unmodified graphene has heat conduction potential, the intrinsic high conductivity of the conventional unmodified graphene can cause serious insulation failure to cause rapid reduction of breakdown voltage; Therefore, how to effectively inhibit the agglomeration tendency of the nano-filler and block the inherent electron transmission path thereof, and to maintain the excellent mechanical flexibility of the paint film while simultaneously achieving high thermal conductivity and high electrical insulation, is a technical problem to be solved. The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure of the invention and therefore it may contain information that does not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention The invention aims to provide a graphene-based high-performance wire enamel and a preparation method thereof, which are used for solving the problems in the background technology. The technical scheme includes that the multifunctional modified graphene dispersion comprises 100 parts of basic enamelled wire resin liquid, 2-15 parts of functionalized modified graphene dispersion liquid, 10-30 parts of diluting solvent and 0.1-1 part of leveling aid, wherein the functionalized modified graphene dispersion liquid comprises functionalized modified graphene, graphene oxide is taken as a framework, an insulating siloxane network layer is coated on the surface of the graphene oxide, and active isocyanate groups are grafted on the surface of the insulating siloxane network layer. Further, the base enamelled wire resin liquid is one of polyamide imide resin liquid, polyester imide resin liquid or polyimide resin liquid, and the solid content of the base enamelled wire resin liquid is 25% -35%. Further, the diluting solvent is selected from one or more of N-methylpyrrolidone, N-dimethylformamide, N-dimethylacetamide and m-cresol, and the solid content of the functionalized modified graphene dispersion liquid is 3% -8%. Further, the insulating siloxane network layer is a cohydrolysis condensation product of tetraethoxysilane and an aminosilane coupling agent, and the active isocyanate group is a grafting product of a reaction between a diisocyanate monomer and amino groups on the aminosilane coupling agent. A preparation method of graphene-based high-performance wire enamel comprises the steps of dispersing graphene oxide powder in a strong polar aprotic solvent in an ultrasonic manner, adding deionized water, then dropwise adding tetraethoxysilane and an aminosilane coupling agent, reacting at a constant temperature by utilizing the weak alkaline self-catalysis of the aminosilane coupling agent to obtain an amino insulated graphene slurry, adding an azeotropic solvent into the amino insulated graphene slurry, heating to perform azeotropic distillation reflux, removing water and micromolecular alcohol generated by hydrolysis through a water separator, then steaming out the azeotropic solvent, cooling to room temperature to obtain an anhydrous slurry, adding diisocyanate monomer into the anhydrous slurry under the protection of nitrogen, reacting at constant temperature to obtain a functionalized modified graphene dispersion liquid, adding a diluting solvent and a leveling aid into the basic resin liquid, performing high-speed shearing dispersion, filtering and vacuum defoaming to obtain the graphene-based high-performance wire enamel. Further, in the step of obtaining the amination insulated graphene slurry, the strong polar aprotic solvent is N-methyl pyrrolidone, the aminosilane coupling agent is 3-aminopropyl triethoxysilane, and the reaction is carried out at a constant temperature of 50-70 ℃ for 6-12 hours. In the step of obtaining the anhydrous slurry, the azeotropic solvent is toluene or xylene, and the temperature for azeotropic distillation reflux is 110-130 ℃. Further, in the step of obtaining the functionalized modified graphene dispersion liquid, the diisocyanate monomer is selected from diphenylmethane diisocyanate, toluene-2, 4-diisocyanate or toluene-2, 6-diisocyanate, and the constant temperature reaction is carried out at 60-80 ℃ for 2-4 hours. Further, in the step of obtaining the graphene-based high-performance wire enamel, the rotating s