High-voltage-resistant polyester enameled wire for explosion-proof motor and manufacturing method thereof

Abstract

The invention discloses a high-voltage-resistant polyester enameled wire for an explosion-proof motor and a manufacturing method of the high-voltage-resistant polyester enameled wire. The high-voltage-resistant polyester enameled wire for the explosion-proof motor comprises a metal conductor as well as a polyester-imide layer, a shielding layer, a nano-modified polyamide-imide layer, an arc-resistant layer, a corrosion-resistant layer and an outer protective layer which are sequentially coated outside the metal conductor from inside to outside. According to the high-voltage-resistant polyester enameled wire for the explosion-proof motor and the manufacturing method of the high-voltage-resistant polyester enameled wire, under the condition that the explosion-proof grade requirement of a coal mine motor is met, the voltage-resistant grade can be further improved, product updating and upgrading are accelerated, high-frequency loss is reduced, the high voltage of 15 kV or above can be borne, the high-frequency loss is smaller than or equal to 0.15 W / m and 10 kHz, and the high-voltage-resistant polyester enameled wire has high application and popularization value.

Description

Technical Field

[0001] The invention belongs to the technical field of enameled wires, and in particular relates to a high-voltage resistant polyester enameled wire for explosion-proof motors and a manufacturing method thereof. Background Art

[0002] Enameled wire is the main raw material for products such as motors, electrical appliances and household appliances. As the safety performance requirements for motor equipment in flammable and explosive places such as coal mines and petrochemicals become increasingly stringent, explosion-proof motors need to operate stably for a long time under high voltage, high frequency and harsh working conditions. This puts higher requirements on the insulation performance, voltage resistance and environmental corrosion resistance of the enameled wire.

[0003] Although traditional polyester enameled wire has certain heat resistance and mechanical strength, it is difficult to meet the requirements of high-voltage environments above 15kV, and there is still much room for improvement.

[0004] Based on this, the present invention discloses a high-voltage resistant polyester enameled wire for explosion-proof motors and a manufacturing method thereof. Summary of the Invention

[0005] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a high-voltage resistant polyester enameled wire for explosion-proof motors and a manufacturing method thereof.

[0006] In order to achieve the above-mentioned purpose and the above-mentioned technical effect, the technical solution adopted by the present invention is:

[0007] A high-voltage polyester enameled wire for explosion-proof motors comprises a metal conductor and a polyesterimide layer, a shielding layer, a nano-modified polyamideimide layer, an arc-resistant layer, a corrosion-resistant layer and an outer protective layer sequentially coated on the outside of the metal conductor from the inside out.

[0008] Furthermore, the metal conductor is made of a plurality of oxygen-free copper wires with a single-filament diameter of 0.08-0.15 mm, which are alternately twisted in the S direction and the Z direction, and the twisting pitch ratio is 8-15.

[0009] Furthermore, the shielding layer is a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:1-5, with a coating thickness of 50-120 μm, and the particle size of the nano-titanium dioxide is 1-10 nm.

[0010] Furthermore, the thickness of the polyesterimide layer is 0.01-0.08 mm.

[0011] Furthermore, the thickness of the nano-modified polyamide-imide layer is 0.04-0.09 mm, and the layer is prepared by modifying polyamide-imide with nano-aluminum oxide, and the particle size of the nano-aluminum oxide is 20-45 nm.

[0012] Furthermore, the arc-resistant layer is prepared by nano-boron nitride and fluorinated ethylene propylene copolymer, the particle size of the nano-boron nitride is 70-110 nm, and the melt index of the fluorinated ethylene propylene copolymer is 5-9 g / 10 min.

[0013] Furthermore, the thickness of the arc-resistant layer is 0.05-0.1 mm.

[0014] Furthermore, the thickness of the corrosion-resistant layer is 0.02-0.07 mm.

[0015] Furthermore, the thickness of the outer protective layer is 0.02-0.1 mm.

[0016] The present invention also discloses a method for manufacturing a high-voltage resistant polyester enameled wire for an explosion-proof motor, comprising the following steps:

[0017] 1) Preparation of metal conductors

[0018] Anneal the oxygen-free copper wire under nitrogen protection at a temperature of 450-480°C for 2-3 hours, and then alternately twist several oxygen-free copper wires with a single-filament diameter of 0.08-0.15 mm in the S-direction and the Z-direction to form a metal conductor for use;

[0019] 2) coating the exterior of the metal conductor with a polyesterimide paint having a viscosity of 130-160 cps and drying at 180-260° C. to a thickness of 0.01-0.08 mm to obtain a polyesterimide layer;

[0020] 3) spraying a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:1-5 on the outside of the polyesterimide layer at a spraying voltage of 20-35 kV and a curing temperature of 170-210° C. to obtain a shielding layer;

[0021] 4) Coating a nano-modified polyamide-imide layer on the outside of the shielding layer and drying it at 180-300°C with a coating thickness of 0.04-0.09 mm;

[0022] 5) Extruding nano boron nitride and fluorinated ethylene propylene copolymer on the outside of the nano modified polyamide imide layer by a co-extrusion process at an extrusion temperature of 290-360° C.;

[0023] 6) A corrosion-resistant layer and an outer protective layer are sequentially formed outside the anti-arc layer, and then a plasma surface activation treatment is performed with a processing power of 700-1700W and a time of 30-80s to finally obtain the required high-voltage polyester enameled wire for explosion-proof motors.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention discloses a high-voltage-resistant polyester enameled wire for explosion-proof motors and a manufacturing method thereof. While meeting the explosion-proof grade requirements of coal mine motors, the invention can further improve the withstand voltage grade, accelerate product updates and upgrades, and reduce high-frequency losses. By providing a polyester imide layer, a shielding layer, a nano-modified polyamide-imide layer, and an anti-arc layer, the enameled wire can withstand a high voltage of more than 15 kV, and the high-frequency loss is ≤0.15 W / m@10 kHz, thus having great promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] like Figure 1 As shown, the present invention discloses a high-voltage resistant polyester enameled wire for explosion-proof motors, comprising a metal conductor 1 and a polyesterimide layer 2, a shielding layer 3, a nano-modified polyamideimide layer 4, an anti-arc layer 5, a corrosion-resistant layer 6 and an outer protective layer 7 sequentially coated on the outside of the metal conductor 1 from the inside to the outside.

[0030] The metal conductor 1 is made of a plurality of oxygen-free copper wires with a single-filament diameter of 0.08-0.15 mm, which are alternately twisted in the S direction and the Z direction, and the twist pitch ratio is 8-15.

[0031] The polyesterimide layer 2 has a thickness of 0.01-0.08 mm and directly covers the metal conductor 1 to provide basic dielectric strength. After curing at 180-260° C., a dense pinhole-free structure is formed.

[0032] The shielding layer 3 is a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:1-5, with a coating thickness of 50-120 μm and a particle size of the nano-titanium dioxide of 1-10 nm.

[0033] The thickness of the nano-modified polyamide-imide layer 4 is 0.04-0.09 mm, and it is prepared by modifying polyamide-imide with nano-aluminum oxide, and the particle size of the nano-aluminum oxide is 20-45 nm.

[0034] The polyamide-imide resin is completely dissolved in N-methylpyrrolidone solvent, followed by the addition of nano-alumina and a silane coupling agent. High-speed shear emulsification and ultrasonic treatment are used to evenly disperse the nano-alumina. The coating is then applied to the exterior of the shielding layer. A step-curing process is employed: pre-baking at 180-200°C for 5-8 minutes to remove the solvent, followed by curing at 200-250°C for 10-35 minutes, and finally at 250-300°C for 10-30 minutes. This improves the coating's heat resistance and density, achieving a surface roughness of Ra ≤ 0.2μm. The nano-alumina is evenly distributed in the polyamide-imide matrix in an "island structure," blocking discharge channels and increasing the dielectric strength to ≥200kV / mm. The silane coupling agent forms Si-O-Al chemical bonds between the nano-alumina and the polyamide-imide, enhancing adhesion.

[0035] The arc-resistant layer 5 is prepared by nano-boron nitride and fluorinated ethylene-propylene copolymer. The particle size of the nano-boron nitride is 70-110 nm, and the melt index of the fluorinated ethylene-propylene copolymer is 5-9 g / 10 min.

[0036] The thickness of the arc-resistant layer 5 is 0.05-0.1 mm.

[0037] The thickness of the corrosion-resistant layer 6 is 0.02-0.07 mm.

[0038] The thickness of the outer sheath 7 is 0.02-0.1 mm.

[0039] In the present invention, graphene microsheets have a large specific surface area and electrical conductivity, and nano-titanium dioxide particles are loaded on the graphene microsheets to form a composite structure, which can neutralize local electric field distortion, inhibit corona discharge, and improve the electromagnetic shielding performance, arc resistance and high temperature resistance of enameled wire products. Fluorinated ethylene propylene copolymer has good insulation, chemical corrosion resistance and arc resistance, and nano-boron nitride has good electrical insulation and thermal conductivity. The combination of the two can improve the heat dissipation and insulation properties of enameled wire products, and is suitable for scenarios such as explosion-proof motors that require heat dissipation and insulation.

[0040] The present invention also discloses a method for manufacturing a high-voltage resistant polyester enameled wire for an explosion-proof motor, comprising the following steps:

[0041] 1) Preparation of metal conductors

[0042] Anneal the oxygen-free copper wire under nitrogen protection at a temperature of 450-480°C for 2-3 hours, and then alternately twist several oxygen-free copper wires with a single-filament diameter of 0.08-0.15 mm in the S-direction and the Z-direction to form a metal conductor for use;

[0043] 2) coating the outer surface of the metal conductor with a polyesterimide paint having a viscosity of 130-160 cps to a thickness of 0.01-0.08 mm, and drying at 180-260° C., preferably in three steps: the first step at 180° C., the second step at 230° C., and the third step at 260° C., to obtain a polyesterimide layer;

[0044] 3) spraying a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:1-5 on the outside of the polyesterimide layer, with a spraying voltage of 20-35 kV and a curing temperature of 170-210° C., preferably, the curing temperature is cyclically changed from 170° C. to 210° C. to 200° C., with each temperature section being maintained for 10-15 seconds, to obtain a shielding layer;

[0045] 4) coating the outer surface of the shielding layer with a nano-modified polyamide-imide layer with a coating thickness of 0.04-0.09 mm and drying at 180-300° C. Preferably, a step-curing process is adopted, first pre-baking at 180-200° C. for 5-8 minutes to remove the solvent, then curing at 200-250° C. for 10-35 minutes, and then curing at 250-300° C. for 10-30 minutes;

[0046] 5) Extruding nano boron nitride and fluorinated ethylene propylene copolymer on the outside of the nano modified polyamide imide layer by co-extrusion process, with the extrusion temperature being 290-360°C: 290°C in zone 1, 300°C in zone 2, 320°C in zone 3, 330°C in zone 4, 350°C in zone 5, and 360°C in zone 6;

[0047] 6) A corrosion-resistant layer and an outer protective layer are sequentially formed outside the anti-arc layer, and then a plasma surface activation treatment is performed. The treatment gas is one or a combination of argon and nitrogen. The treatment pressure is 0.4-0.7 mbar, the treatment power is 700-1700 W, and the treatment time is 30-80 s. Finally, the required high-voltage polyester enameled wire for explosion-proof motors is obtained.

[0048] The high-voltage polyester enameled wire for explosion-proof motors manufactured by the present invention not only meets the explosion-proof grade requirements of coal mine motors, but also further improves the voltage resistance grade, accelerates product updates and upgrades, reduces high-frequency losses, and can withstand high voltages above 15kV, with high-frequency losses ≤0.15W / m@10kHz.

[0049] Example 1

[0050] like Figure 1 As shown, a high-voltage polyester enameled wire for explosion-proof motors includes a metal conductor 1 and a polyesterimide layer 2, a shielding layer 3, a nano-modified polyamideimide layer 4, an arc-resistant layer 5, a corrosion-resistant layer 6 and an outer protective layer 7, which are sequentially coated on the outside of the metal conductor 1 from the inside to the outside.

[0051] The metal conductor 1 is made of a plurality of oxygen-free copper wires with a single-filament diameter of 0.08 mm, which are alternately twisted in the S direction and the Z direction, with a twisting pitch ratio of 10.

[0052] The thickness of the polyesterimide layer 2 is 0.05 mm.

[0053] The shielding layer 3 is a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:1, with a coating thickness of 80 μm and a particle size of the nano-titanium dioxide of 5 nm.

[0054] The thickness of the nano-modified polyamide-imide layer 4 is 0.05 mm, and the layer is prepared by modifying polyamide-imide with nano-aluminum oxide, and the particle size of the nano-aluminum oxide is 30 nm.

[0055] A polyamide-imide resin was completely dissolved in N-methylpyrrolidone to obtain a 25wt% polyamide-imide solution. 8wt% nano-alumina and 0.5wt% silane coupling agent were then added. The nano-alumina was evenly dispersed through high-speed shear emulsification (8000 rpm, 30 minutes) coupled with ultrasonic treatment (500W, 40kHz, 1 hour). The solution was then applied to the exterior of the shielding layer. A step-curing process was employed: pre-baking at 180°C for 7 minutes to remove the solvent, followed by curing at 250°C for 120 minutes, and finally at 300°C for 10 minutes. This enhanced the coating's heat resistance and density, resulting in a surface roughness Ra <0.2μm. The nano-alumina was evenly distributed in the polyamide-imide matrix in an "island-in-the-sea" structure, with a dielectric strength >200kV / mm. The silane coupling agent formed Si-O-Al chemical bonds between the nano-alumina and the polyamide-imide, enhancing adhesion.

[0056] The arc-resistant layer 5 is prepared by nano-boron nitride and fluorinated ethylene-propylene copolymer. The particle size of the nano-boron nitride is 90 nm, and the melt index of the fluorinated ethylene-propylene copolymer is 9 g / 10 min.

[0057] The thickness of the arc-proof layer 5 is 0.05 mm.

[0058] The thickness of the corrosion-resistant layer 6 is 0.05 mm, and the coating layer is made of perchlorethylene anticorrosive paint.

[0059] The outer protective layer 7 has a thickness of 0.1 mm and is made of polyurethane material.

[0060] A method for manufacturing a high-voltage resistant polyester enameled wire for an explosion-proof motor comprises the following steps:

[0061] 1) Preparation of metal conductor 1

[0062] The oxygen-free copper wire was annealed under nitrogen protection at a temperature of 480°C for 2 hours, and then several oxygen-free copper wires with a single filament diameter of 0.08 mm were twisted alternately in the S direction and the Z direction to form a metal conductor for use;

[0063] 2) Coating the exterior of the metal conductor 1 with a polyesterimide varnish having a viscosity of 130 cps and drying at 180-260° C., preferably in three steps: the first step at 180° C., the second step at 230° C., and the third step at 260° C., with a coating thickness of 0.05 mm to obtain a polyesterimide layer 2;

[0064] 3) spraying a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:1 on the outside of the polyesterimide layer 2 at a spraying voltage of 35 kV and a curing temperature of 170° C. → 210° C. → 200° C. in a cycle, with each temperature stage maintained for 10 seconds, to obtain a shielding layer 3;

[0065] 4) Coating a nano-modified polyamide-imide layer 4 on the outside of the shielding layer 3 with a coating thickness of 0.05 mm. Using a step-curing process, pre-bake at 180° C. for 8 minutes to remove the solvent, then cure at 200° C. for 10 minutes, and then cure at 300° C. for 10 minutes;

[0066] 5) Extruding nano boron nitride and fluorinated ethylene propylene copolymer on the outside of the nano modified polyamide imide layer by co-extrusion process, with the extrusion temperature being 290-360°C: 290°C in zone 1, 300°C in zone 2, 320°C in zone 3, 330°C in zone 4, 350°C in zone 5, and 360°C in zone 6;

[0067] 6) A corrosion-resistant layer 6 and an outer protective layer 7 are sequentially formed outside the anti-arc layer 5, and then a plasma surface activation treatment is performed. The treatment gas is argon, the treatment pressure is 0.4 mbar, the treatment power is 1700 W, and the treatment time is 40 s, and finally the required high-voltage polyester enameled wire for explosion-proof motors is obtained.

[0068] Example 2

[0069] like Figure 1 As shown, a high-voltage polyester enameled wire for explosion-proof motors includes a metal conductor 1 and a polyesterimide layer 2, a shielding layer 3, a nano-modified polyamideimide layer 4, an arc-resistant layer 5, a corrosion-resistant layer 6 and an outer protective layer 7, which are sequentially coated on the outside of the metal conductor 1 from the inside to the outside.

[0070] The metal conductor 1 is made of a plurality of oxygen-free copper wires with a single-filament diameter of 0.15 mm, which are alternately twisted in the S direction and the Z direction, with a twisting pitch ratio of 15.

[0071] The thickness of the polyesterimide layer 2 is 0.08 mm.

[0072] The shielding layer 3 is a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:1.5, with a coating thickness of 120 μm and a particle size of the nano-titanium dioxide of 10 nm.

[0073] The thickness of the nano-modified polyamide-imide layer 4 is 0.04 mm, and the nano-modified polyamide-imide layer 4 is prepared by modifying the polyamide-imide with nano-aluminum oxide, and the particle size of the nano-aluminum oxide is 40 nm.

[0074] The polyamide-imide resin is completely dissolved in N-methylpyrrolidone solvent, and then nano-alumina and silane coupling agent are added. The nano-alumina is evenly dispersed through high-speed shear emulsification + ultrasonic treatment, and then coated on the outside of the shielding layer. A step-curing process is adopted, first pre-baking at 200°C for 5 minutes to remove the solvent, then curing at 230°C for 15 minutes, and then curing at 280°C for 10 minutes to improve the heat resistance and density of the coating.

[0075] The arc-resistant layer 5 is prepared by nano-boron nitride and fluorinated ethylene-propylene copolymer. The particle size of the nano-boron nitride is 70 nm, and the melt index of the fluorinated ethylene-propylene copolymer is 5 g / 10 min.

[0076] The thickness of the arc-proof layer 5 is 0.1 mm.

[0077] The thickness of the corrosion-resistant layer 6 is 0.07 mm.

[0078] The thickness of the outer sheath 7 is 0.1 mm.

[0079] A method for manufacturing a high-voltage resistant polyester enameled wire for an explosion-proof motor comprises the following steps:

[0080] 1) Preparation of metal conductor 1

[0081] The oxygen-free copper wire was annealed under nitrogen protection at a temperature of 450°C for 3 hours, and then several oxygen-free copper wires with a single wire diameter of 0.15 mm were twisted alternately in the S direction and the Z direction to form a metal conductor for use;

[0082] 2) Coating the exterior of the metal conductor 1 with a polyesterimide varnish having a viscosity of 160 cps to a thickness of 0.08 mm and drying the varnish at 180-260° C. in three steps: the first step at 180° C., the second step at 230° C., and the third step at 260° C., to form a polyesterimide layer 2;

[0083] 3) spraying a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:1.5 on the outside of the polyesterimide layer 2 at a spraying voltage of 20 kV and a curing temperature of 170° C. → 210° C. → 200° C. in a cycle, with each temperature stage maintained for 15 s, to obtain a shielding layer 3;

[0084] 4) Coating a nano-modified polyamide-imide layer 4 on the outside of the shielding layer 3 with a coating thickness of 0.04 mm, and drying at 180-300°C. A step-curing process is used, first pre-baking at 200°C for 5 minutes to remove the solvent, then curing at 250°C for 10 minutes, and then curing at 300°C for 10 minutes;

[0085] 5) Extruding nano boron nitride and fluorinated ethylene propylene copolymer on the outside of the nano modified polyamide imide layer 4 by a co-extrusion process, the extrusion temperature is 290-360° C.: 290° C. in zone 1, 300° C. in zone 2, 320° C. in zone 3, 330° C. in zone 4, 350° C. in zone 5, and 360° C. in zone 6;

[0086] 6) A corrosion-resistant layer 6 and an outer protective layer 7 are sequentially formed outside the anti-arc layer 5, and then a plasma surface activation treatment is performed. The treatment gas is argon, the treatment pressure is 0.7 mbar, the treatment power is 1700 W, and the treatment time is 50 s, and finally the required high-voltage polyester enameled wire for explosion-proof motors is obtained.

[0087] The rest is the same as in Example 1.

[0088] Example 3

[0089] like Figure 1 As shown, a high-voltage polyester enameled wire for explosion-proof motors includes a metal conductor 1 and a polyesterimide layer 2, a shielding layer 3, a nano-modified polyamideimide layer 4, an arc-resistant layer 5, a corrosion-resistant layer 6 and an outer protective layer 7, which are sequentially coated on the outside of the metal conductor 1 from the inside to the outside.

[0090] The metal conductor is made of a plurality of oxygen-free copper wires with a single-filament diameter of 0.10 mm, which are alternately twisted in the S direction and the Z direction, and the twist pitch ratio is 8.

[0091] The thickness of the polyesterimide layer 2 is 0.06 mm.

[0092] The shielding layer 3 is a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:2, with a coating thickness of 50 μm and a particle size of the nano-titanium dioxide of 5 nm.

[0093] The thickness of the nano-modified polyamide-imide layer 4 is 0.09 mm, and it is prepared by modifying polyamide-imide with nano-aluminum oxide, and the particle size of the nano-aluminum oxide is 20 nm.

[0094] The polyamide-imide resin is completely dissolved in N-methylpyrrolidone solvent, and then nano-alumina and silane coupling agent are added. The nano-alumina is evenly dispersed through high-speed shear emulsification + ultrasonic treatment, and then coated on the outside of the shielding layer. A step-curing process is adopted, first pre-baking at 190°C for 7 minutes to remove the solvent, then curing at 240°C for 25 minutes, and then curing at 280°C for 12 minutes to improve the heat resistance and density of the coating.

[0095] The arc-resistant layer 5 is prepared by nano-boron nitride and fluorinated ethylene-propylene copolymer. The particle size of the nano-boron nitride is 110 nm, and the melt index of the fluorinated ethylene-propylene copolymer is 8 g / 10 min.

[0096] The thickness of the arc-proof layer 5 is 0.08 mm.

[0097] The thickness of the corrosion-resistant layer 6 is 0.02 mm.

[0098] The thickness of the outer sheath 7 is 0.05 mm.

[0099] A method for manufacturing a high-voltage resistant polyester enameled wire for an explosion-proof motor comprises the following steps:

[0100] 1) Preparation of metal conductor 1

[0101] The oxygen-free copper wire was annealed under nitrogen protection at a temperature of 470°C for 2.5 hours. Subsequently, several oxygen-free copper wires with a single-filament diameter of 0.10 mm were twisted alternately in the S-direction and the Z-direction to form a metal conductor for use.

[0102] 2) Coating the exterior of the metal conductor 1 with a polyesterimide varnish having a viscosity of 150 cps to a thickness of 0.06 mm and drying the varnish at 180-260° C. in three steps: the first step at 180° C., the second step at 230° C., and the third step at 260° C., to form a polyesterimide layer 2;

[0103] 3) spraying a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:1 on the outside of the polyesterimide layer 2 at a spraying voltage of 25 kV and a curing temperature of 170-210° C. The curing temperature was cyclically changed from 170° C. to 210° C. to 200° C., with each temperature section maintained for 10 seconds, to obtain a shielding layer 3;

[0104] 4) Coating a nano-modified polyamide-imide layer 4 on the outside of the shielding layer 3 with a coating thickness of 0.09 mm and drying at 180-300° C. Using a step-curing process, pre-baking at 180° C. for 8 minutes to remove the solvent, then curing at 220° C. for 35 minutes, and finally curing at 300° C. for 10 minutes;

[0105] 5) Extruding nano boron nitride and fluorinated ethylene propylene copolymer on the outside of the nano modified polyamide imide layer by co-extrusion process, with the extrusion temperature being 290-360°C: 290°C in zone 1, 300°C in zone 2, 320°C in zone 3, 330°C in zone 4, 350°C in zone 5, and 360°C in zone 6;

[0106] 6) A corrosion-resistant layer and an outer protective layer are sequentially formed outside the anti-arc layer, and then a plasma surface activation treatment is performed. The treatment gas is nitrogen, the treatment pressure is 0.7 mbar, the treatment power is 1200 W, and the treatment time is 35 s, and finally the required high-voltage polyester enameled wire for explosion-proof motors is obtained.

[0107] The rest is the same as in Example 1.

[0108] 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.

[0109] 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-voltage polyester enameled wire for explosion-proof motors, characterized in that: The invention comprises a metal conductor and a polyesterimide layer, a shielding layer, a nano-modified polyamideimide layer, an arc-resistant layer, a corrosion-resistant layer and an outer protective layer which are sequentially coated on the outside of the metal conductor from the inside to the outside.

2. The high-voltage resistant polyester enameled wire for explosion-proof motors according to claim 1, characterized in that: The metal conductor is made of a plurality of oxygen-free copper wires with a single-filament diameter of 0.08-0.15 mm, which are alternately twisted in the S direction and the Z direction, and the twisting pitch ratio is 8-15.

3. The high-voltage resistant polyester enameled wire for explosion-proof motors according to claim 1, characterized in that: The shielding layer is a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:1-5, with a coating thickness of 50-120 μm. The particle size of the nano-titanium dioxide is 1-10 nm.

4. The high-voltage resistant polyester enameled wire for explosion-proof motors according to claim 1, characterized in that: The thickness of the polyesterimide layer is 0.01-0.08 mm.

5. The high-voltage resistant polyester enameled wire for explosion-proof motors according to claim 1, characterized in that: The thickness of the nano-modified polyamide-imide layer is 0.04-0.09 mm, and the layer is prepared by modifying polyamide-imide with nano-aluminum oxide. The particle size of the nano-aluminum oxide is 20-45 nm.

6. The high-voltage resistant polyester enameled wire for explosion-proof motors according to claim 1, characterized in that: The arc-resistant layer is prepared by nano-boron nitride and fluorinated ethylene-propylene copolymer. The particle size of the nano-boron nitride is 70-110 nm, and the melt index of the fluorinated ethylene-propylene copolymer is 5-9 g / 10 min.

7. The high-voltage resistant polyester enameled wire for explosion-proof motors according to claim 1, characterized in that: The thickness of the arc-resistant layer is 0.05-0.1 mm.

8. The high-voltage resistant polyester enameled wire for explosion-proof motors according to claim 1, characterized in that: The thickness of the corrosion-resistant layer is 0.02-0.07 mm.

9. The high-voltage resistant polyester enameled wire for explosion-proof motors according to claim 1, characterized in that: The thickness of the outer protective layer is 0.02-0.1 mm.

10. The method for producing a high-voltage resistant polyester enameled wire for explosion-proof motors according to any one of claims 1 to 9, characterized in that: The following steps are involved: 1) Preparation of metal conductors Anneal the oxygen-free copper wire under nitrogen protection at a temperature of 450-480°C for 2-3 hours, and then alternately twist several oxygen-free copper wires with a single-filament diameter of 0.08-0.15 mm in the S-direction and the Z-direction to form a metal conductor for use; 2) coating the exterior of the metal conductor with a polyesterimide paint having a viscosity of 130-160 cps and drying at 180-260° C. to a thickness of 0.01-0.08 mm to obtain a polyesterimide layer; 3) spraying a mixture of graphene microsheets and nano-titanium dioxide in a weight ratio of 1:1-5 on the outside of the polyesterimide layer at a spraying voltage of 20-35 kV and a curing temperature of 170-210° C. to obtain a shielding layer; 4) Coating a nano-modified polyamide-imide layer on the outside of the shielding layer and drying it at 180-300°C with a coating thickness of 0.04-0.09 mm; 5) Extruding nano boron nitride and fluorinated ethylene propylene copolymer on the outside of the nano modified polyamide imide layer by a co-extrusion process at an extrusion temperature of 290-360° C.; 6) A corrosion-resistant layer and an outer protective layer are sequentially formed outside the anti-arc layer, and then a plasma surface activation treatment is performed with a processing power of 700-1700W and a time of 30-80s to finally obtain the required high-voltage polyester enameled wire for explosion-proof motors.

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