High-speed winding polyesterimide enameled wire and manufacturing method thereof

Abstract

The invention discloses a high-speed winding polyester-imine enameled wire and a manufacturing method thereof. The high-speed winding polyester-imine enameled wire comprises a conductor, a polyurethane-imine resin layer, a polyester-imine insulating layer and a self-lubricating functional layer which are sequentially arranged from inside to outside, and the self-lubricating functional layer is formed by compounding modified polyamide-imide resin and a solid lubricant. The modified graphene and the polytetrafluoroethylene are introduced and compounded with the modified polyamide-imide resin, so that the dynamic friction coefficient of the enameled wire can be reduced synergistically, the dynamic friction coefficient is less than or equal to 0.12, the polyamide-imide resin is modified, the graphene is modified, and the nano titanium dioxide is modified; according to the present invention, the compatibility and the interface bonding force between the modified polyamide-imide resin and the solid lubricant can be easily improved, the mechanical strength and the wear resistance of the coating can be improved, the friction heat can be effectively dispersed by using the high thermal conductivity of the graphene, and the direct friction contact area can be easily reduced by designing the micron-sized corrugated structure.

Description

Technical Field

[0001] The invention belongs to the technical field of enameled wires, and in particular relates to a high-speed winding polyesterimide enameled wire and a manufacturing method thereof. Background Art

[0002] In applications such as motor coils, where enameled wire requires multiple layers of winding, the wire's mechanical properties directly impact winding efficiency and finished product reliability. While traditional enameled wire offers high insulation and heat resistance, its dynamic coefficient of friction is high, typically exceeding 0.25. High-speed winding can lead to significant temperature rise at the contact surface between the wire and the winding die, softening or carbonizing the wire's insulation. This instability in the dynamic coefficient of friction can also cause uneven wire routing, impacting product quality.

[0003] Based on this, the present invention discloses a high-speed winding polyesterimide enameled wire and a manufacturing method thereof, wherein a self-lubricating functional layer is added to the outside of the enameled wire to ensure the stability of the polyesterimide enameled wire during high-speed winding. Summary of the Invention

[0004] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a high-speed winding polyesterimide enameled wire and a manufacturing method thereof.

[0005] In order to achieve the above-mentioned purpose and the above-mentioned technical effect, the technical solution adopted by the present invention is:

[0006] A high-speed winding polyesterimide enameled wire comprises a conductor, a polyurethaneimide resin layer, a polyesterimide insulation layer and a self-lubricating functional layer arranged in sequence from the inside to the outside. The self-lubricating functional layer is formed by compounding a modified polyamide-imide resin and a solid lubricant, and has a dynamic friction coefficient of ≤0.12.

[0007] Furthermore, the solid lubricant is a composite of modified graphene and polytetrafluoroethylene, and the mass ratio of modified graphene to polytetrafluoroethylene is 0.5-1.5:3-8.

[0008] Furthermore, the solid lubricant is a composite of modified graphene, polytetrafluoroethylene and modified nano-titanium dioxide, and the mass ratio of modified graphene, polytetrafluoroethylene and modified nano-titanium dioxide is 0.5-1.5:3-8:0.1-0.5.

[0009] Furthermore, the modified graphene is graphene surface-modified with a silane coupling agent, and contains amino functional groups, the stoichiometric ratio of which can react with functional groups on the modified polyamide-imide resin, and the modified polyamide-imide resin contains epoxy or carboxyl functional groups.

[0010] Furthermore, the modified graphene has a sheet-like structure with a lateral size of 2-8 μm and a thickness of ≤2 nm.

[0011] Furthermore, the modified nano-titanium dioxide is nano-titanium dioxide particles coated with organic siloxane, and the particle size is 20-60 nm.

[0012] The present invention also discloses a method for manufacturing a high-speed winding polyesterimide enameled wire, comprising the following steps:

[0013] 1) preparing a polyurethaneimide resin layer on the outer surface of the conductor;

[0014] 2) preparing a polyesterimide insulation layer on the outer surface of the polyurethaneimide resin layer;

[0015] 3) preparing a self-lubricating functional layer on the outer surface of the polyesterimide insulation layer;

[0016] 4) Imprinting a micron-scale corrugated structure on the surface of the self-lubricating functional layer, with a corrugation depth of 0.5-2 μm, a wavelength of 10-28 μm, and an angle between the corrugation direction and the conductor axis of 45-60°, ultimately obtaining the desired high-speed winding polyesterimide enameled wire.

[0017] Furthermore, in step 1), a polyurethaneimide resin paint is coated on the outer surface of the conductor and cured at 250-310° C. for 25-45 seconds to form a polyurethaneimide resin layer.

[0018] Furthermore, in step 2), polyesterimide insulating varnish is coated on the outer surface of the polyurethaneimide resin layer, heated to 330-360°C at a rate of 8-12°C / s, maintained for 10-30s, and then heated to 380-420°C at a rate of 3-8°C / s to complete curing, thereby forming a polyesterimide insulating layer.

[0019] Furthermore, in step 3), a composite of modified polyamide-imide resin and solid lubricant is coated on the outer surface of the polyesterimide insulation layer, and cured by electromagnetic induction heating at 280-320°C, with a magnetic field strength of 0.5-1.5T and a frequency of 50-100kHz to form a self-lubricating functional layer.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention discloses a high-speed winding polyesterimide enameled wire and a manufacturing method thereof. The contradiction between frictional heat generation and insulation performance during high-speed winding is solved by designing a three-layer structure of a polyurethaneimide resin layer, a polyesterimide insulation layer and a self-lubricating functional layer on the outside of the conductor; a strong bonding force between the three-layer structure can be achieved through a gradient curing process; the dynamic friction coefficient of the enameled wire can be synergistically reduced by introducing modified graphene and polytetrafluoroethylene and compounding them with a modified polyamide-imide resin, achieving a dynamic friction coefficient of 0.12 or less, thereby avoiding a temperature rise between the contact surface of the enameled wire and the winding die during high-speed winding; the modification of the polyamide-imide resin, the modification of the graphene and the modification of the nano-titanium dioxide is conducive to improving the compatibility and interface between the modified polyamide-imide resin and the solid lubricant The bonding force can improve the mechanical strength and wear resistance of the enameled wire. The high thermal conductivity of graphene can be used to effectively disperse frictional heat and prevent the enameled wire from being damaged by excessive temperature rise. Nano-titanium dioxide also has the advantages of decomposing surface pollutants through photocatalysis and maintaining the durability of lubrication performance. By designing a micron-level corrugated structure, the actual contact area between the enameled wire and the winding mold can be reduced to 30-50% of the flat surface. The depressions of the corrugated structure can store solid lubricants. The corrugation direction at an angle of 45-60° to the axis can decompose the shear force along the corrugated slope, reducing the normal stress concentration. The superposition of the above factors leads to a reduction in the dynamic friction coefficient, which can better meet the stringent requirements of the high-speed winding process on the surface properties of the material, and will not cause problems such as enameled wire damage and excessive temperature rise during high-speed winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0023] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0024] The following is a brief summary of one or more aspects to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceivable aspects and is neither intended to identify key or critical elements of all aspects nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that will be provided later.

[0025] like Figure 1 As shown, the present invention discloses a high-speed winding polyesterimide enameled wire, comprising a conductor 1, a polyurethaneimide resin layer 2, a polyesterimide insulation layer 3 and a self-lubricating functional layer 4 arranged in sequence from the inside to the outside, wherein the self-lubricating functional layer 4 is formed by compounding a modified polyamide-imide resin and a solid lubricant, and has a dynamic friction coefficient of ≤0.12.

[0026] In some embodiments, the solid lubricant is a composite of modified graphene and polytetrafluoroethylene, with the mass ratio of modified graphene to polytetrafluoroethylene being 0.5-1.5:3-8. By adding modified graphene and polytetrafluoroethylene and compounding them with a resin, the present invention can synergistically reduce the dynamic friction coefficient, achieving both wear resistance and low friction performance, making it suitable for high-speed winding.

[0027] In other embodiments, the solid lubricant is a composite of modified graphene, polytetrafluoroethylene and modified nano-titanium dioxide, and the mass ratio of modified graphene, polytetrafluoroethylene and modified nano-titanium dioxide is 0.5-1.5:3-8:0.1-0.5.

[0028] In some specific embodiments, the modified polyamide-imide resin contains an epoxy or carboxyl functional group, and the modified graphene is a graphene surface-modified with a silane coupling agent, containing an amino functional group, the stoichiometric ratio of which can react with the functional groups on the modified polyamide-imide resin to form a covalent bond (this reaction is a conventional reaction, and the specific reaction conditions can be designed according to the known technology through a limited number of experiments to design suitable reaction conditions and parameters, which belong to the prior art and are not described here), thereby enhancing the interfacial bonding force between the graphene and the resin. The modified graphene is uniformly dispersed in the resin, which can improve the mechanical strength and wear resistance of the coating, and at the same time, the high thermal conductivity of the graphene can be used to effectively disperse friction heat.

[0029] In some specific embodiments, the modified graphene is a sheet-like structure with a lateral size of 2-8 μm and a thickness of ≤2 nm.

[0030] In some specific embodiments, the modified nano-titanium dioxide is nano-titanium dioxide particles coated with organic siloxane on the surface, with a particle size of 20-60 nm, which can be purchased. By coating the surface of the nano-titanium dioxide with organic siloxane, the nano-titanium dioxide particles can be prevented from agglomerating, which is beneficial to improving the dispersion uniformity and compatibility with the resin. It can also improve the interfacial bonding force between the resin and the nano-particles, and improve the mechanical strength and thermal stability of the coating.

[0031] In some embodiments, the surface of the self-lubricating functional layer 4 is embossed with a micron-scale corrugated structure, with a corrugation depth of 0.5-2 μm, a wavelength of 10-28 μm, and an angle of 45-60° between the corrugation and the conductor axis. By designing the micron-scale corrugated structure, the actual contact area between the enameled wire and the winding die can be reduced to 30-50% of that of a flat surface. The recessed areas of the corrugated structure can store solid lubricants, and the corrugation at an angle of 45-60° to the axis decomposes shear forces along the corrugated slope, reducing normal stress concentration. The combination of these factors contributes to a reduction in the dynamic friction coefficient.

[0032] The present invention also discloses a method for manufacturing a high-speed winding polyesterimide enameled wire, comprising the following steps:

[0033] 1) preparing a polyurethaneimide resin layer 2 on the outer surface of the conductor 1;

[0034] 2) preparing a polyesterimide insulation layer 3 on the outer surface of the polyurethaneimide resin layer 2;

[0035] 3) preparing a self-lubricating functional layer 4 on the outer surface of the polyesterimide insulation layer 3;

[0036] 4) A micron-scale corrugated structure is embossed on the surface of the self-lubricating functional layer 4, with a corrugation depth of 0.5-2 μm, a wavelength of 10-28 μm, and an angle of 45-60° between the corrugation direction and the conductor axis, thereby obtaining the desired high-speed winding polyesterimide enameled wire.

[0037] In step 1), a polyurethaneimide resin paint is coated on the outer surface of the conductor 1 and cured at 250-310° C. for 25-45 seconds to form a polyurethaneimide resin layer 2 .

[0038] In step 2), polyesterimide insulating varnish is applied on the outer surface of the polyurethaneimide resin layer 2, and the temperature is raised to 330-360°C at a rate of 8-12°C / s, maintained for 10-30s, and then raised to 380-420°C at a rate of 3-8°C / s to complete curing, thereby forming a polyesterimide insulating layer 3.

[0039] In step 3), a composite of a modified polyamide-imide resin and a solid lubricant is applied to the outer surface of the polyesterimide insulating layer 3 and cured by electromagnetic induction heating at 280-320°C, with a magnetic field strength of 0.5-1.5T and a frequency of 50-100kHz to form a self-lubricating functional layer 4. Curing by electromagnetic induction heating helps optimize molecular alignment and reduce internal stress.

[0040] Example 1

[0041] like Figure 1 As shown, a high-speed winding polyesterimide enameled wire includes a conductor 1, a polyurethaneimide resin layer 2, a polyesterimide insulation layer 3 and a self-lubricating functional layer 4 arranged in sequence from the inside to the outside, wherein the self-lubricating functional layer 4 is formed by compounding a modified polyamide-imide resin and a solid lubricant, and has a dynamic friction coefficient of approximately 0.10.

[0042] In this embodiment, conductor 1 is a conventional copper round wire, and the solid lubricant is a composite of modified graphene, polytetrafluoroethylene and modified nano-titanium dioxide. The mass ratio of modified graphene, polytetrafluoroethylene and modified nano-titanium dioxide is 1:3:0.1. By adding modified graphene, polytetrafluoroethylene, modified nano-titanium dioxide and compounding with modified polyamide-imide resin, the dynamic friction coefficient can be synergistically reduced, while taking into account wear resistance, low friction performance, high temperature resistance and strong dispersion performance.

[0043] The modified polyamide-imide resin contains carboxyl functional groups, and the modified graphene is graphene surface-modified with the silane coupling agent KH-550, which contains amino functional groups. The stoichiometric ratio of these groups can react with the functional groups on the modified polyamide-imide resin to enhance the interfacial bonding between the graphene and the resin. The modified graphene is evenly dispersed in the resin, which is beneficial to improving the mechanical strength and wear resistance of the coating. At the same time, the high thermal conductivity of graphene can be utilized to effectively disperse frictional heat.

[0044] The modified graphene has a sheet-like structure with a lateral size of 5 μm and a thickness of 1 nm.

[0045] The modified nano-titanium dioxide is a nano-titanium dioxide particle with a surface coated with organic siloxane and a particle size of 30nm. By coating the surface of the nano-titanium dioxide with organic siloxane, the nano-titanium dioxide particles can be prevented from agglomerating, which is beneficial to improving the dispersion uniformity and compatibility with the resin. It can also improve the interface bonding force between the resin and the nano-particles, and improve the mechanical strength and thermal stability of the coating.

[0046] The surface of the self-lubricating functional layer 4 is embossed with a micron-scale corrugated structure, with a corrugation depth of 1 μm, a wavelength of 10 μm, and an angle of 45° between the corrugation direction and the conductor axis.

[0047] A method for producing a high-speed winding polyesterimide enameled wire comprises the following steps:

[0048] 1) preparing a polyurethaneimide resin layer 2 on the outer surface of the conductor 1;

[0049] 2) preparing a polyesterimide insulation layer 3 on the outer surface of the polyurethaneimide resin layer 2;

[0050] 3) preparing a self-lubricating functional layer 4 on the outer surface of the polyesterimide insulation layer 3;

[0051] 4) A micron-scale corrugated structure is embossed on the surface of the self-lubricating functional layer 4 to finally obtain the desired high-speed winding polyesterimide enameled wire.

[0052] In step 1), polyurethaneimide resin paint is coated on the outer surface of the conductor 1 and cured at 280° C. for 30 seconds to form a polyurethaneimide resin layer 2 .

[0053] In step 2), polyesterimide insulating varnish is coated on the outer surface of the polyurethaneimide resin layer 2, and the temperature is raised to 350°C at a rate of 10°C / s, maintained for 20s, and then raised to 400°C at a rate of 5°C / s to complete curing, thereby forming a polyesterimide insulating layer 3.

[0054] In step 3), a composite of a modified polyamide-imide resin and a solid lubricant (95.9:4.1 by mass ratio) is applied to the outer surface of the polyesterimide insulating layer 3 and cured by electromagnetic induction heating at 320°C, a magnetic field strength of 0.5T, and a frequency of 50kHz to form a self-lubricating functional layer 4. Curing by electromagnetic induction heating helps optimize molecular alignment and reduce internal stress.

[0055] Example 2

[0056] like Figure 1 As shown, a high-speed winding polyesterimide enameled wire includes a conductor 1, a polyurethaneimide resin layer 2, a polyesterimide insulation layer 3 and a self-lubricating functional layer 4 arranged in sequence from the inside to the outside, wherein the self-lubricating functional layer 4 is formed by compounding a modified polyamide-imide resin and a solid lubricant, and has a dynamic friction coefficient of about 0.08.

[0057] The solid lubricant is a composite of modified graphene and polytetrafluoroethylene, with a mass ratio of modified graphene to polytetrafluoroethylene of 1.5:4. By adding modified graphene and polytetrafluoroethylene and compounding them with resin, the dynamic friction coefficient can be synergistically reduced, taking into account both wear resistance and low friction performance.

[0058] The modified polyamide-imide resin contains carboxyl functional groups, and the modified graphene is graphene surface-modified with a silane coupling agent and contains amino functional groups. The stoichiometric ratio of the amino functional groups can react with the functional groups on the modified polyamide-imide resin to enhance the interfacial bonding strength between the graphene and the resin. The modified graphene is uniformly dispersed in the resin and the mechanical strength and wear resistance of the coating are improved through the reaction. At the same time, the high thermal conductivity of the graphene can be utilized to effectively disperse frictional heat.

[0059] The modified graphene has a sheet-like structure with a lateral size of 8 μm and a thickness of 2 nm.

[0060] The modified nano-titanium dioxide is a nano-titanium dioxide particle with a surface coated with organic siloxane and a particle size of 50nm. By coating the surface of the nano-titanium dioxide with organic siloxane, the nano-titanium dioxide particles can be prevented from agglomerating, which is beneficial to improving the dispersion uniformity and compatibility with the resin. It can also improve the interface bonding force between the resin and the nano-particles, and improve the mechanical strength and thermal stability of the coating.

[0061] The surface of the self-lubricating functional layer 4 is embossed with a micron-scale corrugated structure, with a corrugation depth of 2 μm, a wavelength of 28 μm, and an angle of 60° between the corrugation direction and the conductor axis.

[0062] A method for producing a high-speed winding polyesterimide enameled wire comprises the following steps:

[0063] 1) preparing a polyurethaneimide resin layer 2 on the outer surface of the conductor 1;

[0064] 2) preparing a polyesterimide insulation layer 3 on the outer surface of the polyurethaneimide resin layer 2;

[0065] 3) preparing a self-lubricating functional layer 4 on the outer surface of the polyesterimide insulation layer 3;

[0066] 4) A micron-scale corrugated structure is embossed on the surface of the self-lubricating functional layer 4 to finally obtain the desired high-speed winding polyesterimide enameled wire.

[0067] In step 1), polyurethaneimide resin paint is coated on the outer surface of the conductor 1 and cured at 310° C. for 25 seconds to form a polyurethaneimide resin layer 2 .

[0068] In step 2), polyesterimide insulating varnish is coated on the outer surface of the polyurethaneimide resin layer 2, and the temperature is raised to 360°C at a rate of 8°C / s, maintained for 10 seconds, and then raised to 420°C at a rate of 8°C / s to complete curing, thereby forming a polyesterimide insulating layer 3.

[0069] In step 3), a composite of a modified polyamide-imide resin and a solid lubricant (94.5:5.5 by mass ratio) is applied to the outer surface of the polyesterimide insulating layer 3 and cured by electromagnetic induction heating at 320°C, a magnetic field strength of 1.5T, and a frequency of 50kHz to form a self-lubricating functional layer 4. Curing by electromagnetic induction heating helps optimize molecular alignment and reduce internal stress.

[0070] The rest is the same as in Example 1.

[0071] Example 3

[0072] like Figure 1 As shown, a high-speed winding polyesterimide enameled wire includes a conductor 1, a polyurethaneimide resin layer 2, a polyesterimide insulation layer 3 and a self-lubricating functional layer 4 arranged in sequence from the inside to the outside, wherein the self-lubricating functional layer 4 is formed by compounding a modified polyamide-imide resin and a solid lubricant, and has a dynamic friction coefficient of about 0.12.

[0073] The solid lubricant is a composite of modified graphene, polytetrafluoroethylene and modified nano-titanium dioxide, and the mass ratio of the modified graphene, polytetrafluoroethylene and modified nano-titanium dioxide is 1.5:3:0.5.

[0074] The modified polyamide-imide resin contains epoxy functional groups, while the modified graphene is surface-modified with a silane coupling agent and contains amino functional groups. Their stoichiometric ratio allows them to react with the functional groups on the modified polyamide-imide resin to form covalent bonds, strengthening the interfacial bonding between the graphene and the resin. The modified graphene is evenly dispersed in the resin, and through this reaction, it enhances the mechanical strength and wear resistance of the coating. Furthermore, the high thermal conductivity of graphene effectively disperses frictional heat.

[0075] The modified graphene has a sheet-like structure with a lateral size of 2 μm and a thickness of 0.5 nm.

[0076] The modified nano-titanium dioxide is a nano-titanium dioxide particle with a surface coated with organic siloxane, with a particle size of 20nm. By coating the surface of the nano-titanium dioxide with organic siloxane, the nano-titanium dioxide particles can be prevented from agglomerating, which is beneficial to improving the dispersion uniformity and compatibility with the resin. It can also improve the interface bonding force between the resin and the nano-particles, and improve the mechanical strength and thermal stability of the coating.

[0077] The surface of the self-lubricating functional layer 4 is embossed with a micron-scale corrugated structure, with a corrugation depth of 0.5 μm, a wavelength of 10 μm, and an angle of 50° between the corrugation direction and the conductor axis.

[0078] A method for producing a high-speed winding polyesterimide enameled wire comprises the following steps:

[0079] 1) preparing a polyurethaneimide resin layer 2 on the outer surface of the conductor 1;

[0080] 2) preparing a polyesterimide insulation layer 3 on the outer surface of the polyurethaneimide resin layer 2;

[0081] 3) preparing a self-lubricating functional layer 4 on the outer surface of the polyesterimide insulation layer 3;

[0082] 4) A micron-scale corrugated structure is embossed on the surface of the self-lubricating functional layer 4 to finally obtain the desired high-speed winding polyesterimide enameled wire.

[0083] In step 1), polyurethaneimide resin paint is coated on the outer surface of the conductor 1 and cured at 290° C. for 35 seconds to form a polyurethaneimide resin layer 2 .

[0084] In step 2), polyesterimide insulating varnish is coated on the outer surface of the polyurethaneimide resin layer 2, and the temperature is raised to 350°C at a rate of 12°C / s, maintained for 20s, and then raised to 380°C at a rate of 3°C / s to complete curing, thereby forming a polyesterimide insulating layer 3.

[0085] In step 3), a composite of a modified polyamide-imide resin and a solid lubricant (95:5 by mass) is applied to the outer surface of the polyesterimide insulating layer 3 and cured by electromagnetic induction heating at 280°C, a magnetic field strength of 1.0T, and a frequency of 50kHz to form a self-lubricating functional layer 4. Curing by electromagnetic induction heating helps optimize molecular alignment and reduce internal stress.

[0086] The rest is the same as in Example 1.

[0087] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0088] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A high-speed winding polyesterimide enameled wire, characterized in that: The invention comprises a conductor, a polyurethaneimide resin layer, a polyesterimide insulating layer and a self-lubricating functional layer which are sequentially arranged from the inside to the outside. The self-lubricating functional layer is compounded by modified polyamide-imide resin and solid lubricant, and has a dynamic friction coefficient of ≤0.

12.

2. The high-speed winding polyesterimide enameled wire according to claim 1, characterized in that: The solid lubricant is a composite of modified graphene and polytetrafluoroethylene, and the mass ratio of the modified graphene to the polytetrafluoroethylene is 0.5-1.5:3-8.

3. The high-speed winding polyesterimide enameled wire according to claim 1, characterized in that: The solid lubricant is a composite of modified graphene, polytetrafluoroethylene and modified nano-titanium dioxide, and the mass ratio of the modified graphene, polytetrafluoroethylene and modified nano-titanium dioxide is 0.5-1.5:3-8:0.1-0.

5.

4. A high-speed winding polyesterimide enameled wire according to claim 2 or 3, characterized in that: The modified graphene is graphene surface-modified with a silane coupling agent and contains amino functional groups, the stoichiometric ratio of which can react with functional groups on a modified polyamide-imide resin, wherein the modified polyamide-imide resin contains epoxy or carboxyl functional groups.

5. The high-speed winding polyesterimide enameled wire according to claim 2 or 3, characterized in that: The modified graphene is a sheet-like structure with a lateral size of 2-8 μm and a thickness of ≤2 nm.

6. The high-speed winding polyesterimide enameled wire according to claim 3, characterized in that: The modified nano titanium dioxide is nano titanium dioxide particles coated with organic siloxane on the surface, and the particle size is 20-60 nm.

7. A method for producing a high-speed winding polyesterimide enameled wire according to any one of claims 1 to 6, characterized in that: The following steps are involved: 1) preparing a polyurethaneimide resin layer on the outer surface of the conductor; 2) preparing a polyesterimide insulation layer on the outer surface of the polyurethaneimide resin layer; 3) preparing a self-lubricating functional layer on the outer surface of the polyesterimide insulation layer; 4) Imprinting a micron-scale corrugated structure on the surface of the self-lubricating functional layer, with a corrugation depth of 0.5-2 μm, a wavelength of 10-28 μm, and an angle between the corrugation direction and the conductor axis of 45-60°, ultimately obtaining the desired high-speed winding polyesterimide enameled wire.

8. The method for producing a high-speed winding polyesterimide enameled wire according to claim 7, characterized in that: In step 1), a polyurethaneimide resin paint is coated on the outer surface of the conductor and cured at 250-310° C. for 25-45 seconds to form a polyurethaneimide resin layer.

9. The method for producing a high-speed winding polyesterimide enameled wire according to claim 7, characterized in that: In step 2), polyesterimide insulating varnish is applied on the outer surface of the polyurethaneimide resin layer, and the temperature is raised to 330-360°C at a rate of 8-12°C / s, maintained for 10-30s, and then raised to 380-420°C at a rate of 3-8°C / s to complete curing to form a polyesterimide insulating layer.

10. The method for producing a high-speed winding polyesterimide enameled wire according to claim 7, characterized in that: In step 3), a composite of modified polyamide-imide resin and solid lubricant is coated on the outer surface of the polyesterimide insulation layer, and cured by electromagnetic induction heating at 280-320°C, with a magnetic field strength of 0.5-1.5T and a frequency of 50-100kHz to form a self-lubricating functional layer.

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