High-adhesion oil-resistant copper-clad steel enameled round wire and preparation method thereof

Abstract

The invention provides a high-adhesion and oil-resistant copper-clad steel enameled round wire and a preparation method thereof. The enameled round wire comprises a coated copper-clad steel conductor, an adhesion coating and an oil-resistant coating, the preparation method comprises the following steps: (1) welding a copper strip coated steel wire, and preparing a soft copper-clad steel base material through drawing and well type high-temperature annealing; (2) further wiredrawing the copper-clad steel base material; (3) carrying out on-line high-temperature annealing, cleaning, cooling, blow-drying and drying; (4) coating, baking and curing to form a film; and (5) cooling and winding to obtain a finished product wire. According to the invention, the adhesiveness of the wire insulating material is improved on the premise of satisfying oil resistance through different insulating material thickness ratios.

Description

Technical Field

[0001] This invention relates to the field of enameled wire technology, and in particular to a high-adhesion, oil-resistant copper-clad steel enameled round wire and its preparation method. Background Technology

[0002] Copper-clad steel, as a conductor material with excellent comprehensive performance, combines the mechanical strength of steel with the conductivity and high-frequency characteristics of copper. It possesses good electrical conductivity and corrosion resistance. Compared to pure copper, copper-clad steel has higher strength and hardness, and significantly improved ductility. It is widely used in the communications, power, and electronic information industries. With the increasing application of various conductive composite metal materials, the application prospects of enameled wire products using copper-clad steel as the conductor will also become increasingly broad.

[0003] With the future growth in demand from the wire and cable industry and the rapid development of emerging fields such as new energy vehicles and smart grids, copper-clad steel wire is expected to usher in new opportunities. Currently, copper-clad steel is less commonly used in enameled wire, but with the continuous development of enameled wire technology and insulation materials, especially the optimization of annealing materials for enameling equipment, the difficulty of achieving in-line tubular annealing has been relatively reduced. The application of enameled wire with copper-clad steel as the conductor will gain market acceptance.

[0004] Because there are many types of solenoid valves, and different application scenarios have different requirements for conductor materials and insulation layer performance.

[0005] In response to customer development needs, we developed an enameled wire product designed for long-term use under high-temperature conditions of being immersed in machine oil. During the winding process, it needs to withstand high tension and low elongation, and the enamel layer must adhere well under high tension. Summary of the Invention

[0006] This invention proposes a copper-clad steel enameled round wire with high adhesion and oil resistance, and its preparation method, which solves the problems of poor adhesion and oil resistance of enameled wires in the prior art.

[0007] It also solves the problem of poor enameled wire resistance to stretching in existing technologies.

[0008] The technical solution of this invention is implemented as follows: A high-adhesion, oil-resistant copper-clad steel enameled round wire, comprising a copper-clad steel conductor, an adhesion coating, and an oil-resistant coating; The material used for the coating is a polyamide composite insulating varnish; the formula of the polyamide composite insulating varnish, calculated by weight percentage, includes: The composition of the product is as follows: Nylon 12 (10-12%), E-20 epoxy resin (3-5%), methyl terephthalate (DMT) (2-2.5%), glycerin (1-1.7%), THEIC (0.3-0.5%), additives (0.5-1%), m- / p-cresol (40-42%), and xylene (40-42%). The additives are catalysts, stabilizers, curing agents, leveling agents, and antioxidants; The oil-resistant coating uses 220 grade polyamide-imide insulating varnish and selects 595 / 30kps enameled wire insulating varnish from Allentas Electrical Insulation Materials Co., Ltd.

[0009] In some embodiments, the chemical composition and mass percentage of steel in the copper-clad steel conductor are as follows: C: 0.15~0.20%, Si: 0.15~0.25%, Mn: 0.70~0.90%, P≤0.02%, S≤0.01%, Cr≤0.03%, Ni≤0.015%, Cu≤0.015%, with the balance being Fe and unavoidable impurities.

[0010] Steel with the above chemical composition has better flexibility after annealing and is suitable for the enameled wire industry.

[0011] In some embodiments, the copper in the copper-clad steel conductor is selected from T2 copper with a copper content of ≥99.95% as the conductor blank. Copper has excellent corrosion resistance, which is an important factor in ensuring product performance; its low resistivity reduces temperature rise during use in the final product.

[0012] With different insulation material thickness ratios, the insulation thickness of the attached coating accounts for 5-15% of the total insulation layer, and the insulation thickness of the oil-resistant coating accounts for 85-95% of the total insulation layer, thereby improving the adhesion of the wire insulation material while meeting the requirements of oil resistance.

[0013] In some embodiments, the conductivity of the copper-clad steel conductor is 40% IACS.

[0014] In some embodiments, the preparation method of the polyamide composite insulating varnish includes: (a) adding glycerol, DMT, THEIC, and catalyst to a reaction vessel, performing an ester exchange reaction at 180~210℃ for 1.5~2h, then increasing the temperature to 220~250℃ for a polycondensation reaction for 2~4h, maintaining negative pressure in the condenser during the reaction process; diluting the resin viscosity at a 1:1 ratio, controlling the viscosity at 5000~10000 mPa·s, measuring every 30-40 minutes, and when the reaction viscosity meets the standard, adding the terminator triphenyl phosphite to terminate the chemical reaction, thus obtaining polyester resin; transferring the reacted polyester resin to a dilution vessel, adding a mixed solvent and stirring vigorously to completely dissolve the resin, and cooling to obtain a heat-resistant polyester resin solution with 40~50% solid content; (b) adding a mixed solvent to the reaction vessel, and slowly adding... (c) Nylon 12 powder is gradually heated to 80-90℃ and maintained at that temperature, and stirred continuously for 3-5 hours until the nylon is completely dissolved to obtain a nylon resin solution; (d) A mixed solvent is added to a reaction vessel, heated to 60-80℃, and E-20 epoxy resin is added and stirred for 3-4 hours until completely dissolved to obtain a dissolved epoxy resin solution; (e) Mixing and blending: The dissolved epoxy resin solution is slowly added to the nylon resin solution, stirred at high speed for 1-2 hours, and then added together to the heat-resistant polyester solution, and stirred for another 1-2 hours to form a stable composite resin solution; (f) Additives are added to the composite resin solution and stirred evenly; then, a high-precision filter is used to filter and remove impurities; then, the solution is diluted with a mixed solvent of m / p-cresol and xylene to adjust the viscosity of the paint to 1500-2500 mPa·s (30℃). The mixed solvent is obtained by mixing m / p-cresol and xylene in a weight ratio of 0.9-1:0.9-1; wherein the first dosage is 0.3-0.35% of the total; the second dosage is 0.22-0.26% of the total; and the third dosage is the balance.

[0015] In some embodiments, the catalyst is zinc acetate; the stabilizer is antimony trioxide; the curing agent is butyl phthalate; the leveling agent is an acrylate; and the antioxidant is hindered phenol 1010 or 1076.

[0016] A method for preparing high-adhesion, oil-resistant copper-clad steel enameled round wire includes: (1) Weld oxygen-free copper strips to cover steel wires, and prepare soft copper-clad steel base material by drawing and well-type high-temperature annealing; (2) The copper-clad steel base material is further drawn to obtain wires of the required size; (3) The specified yarn is subjected to online high-temperature annealing, cleaning, cooling, blowing dry, and baking; (4) Coat the surface of the standard wire treated in step (3) with an adhesion layer, apply 1 to 3 times, and bake and cure each layer to form a film; coat the surface of the standard wire with the adhesion layer with an oil-resistant layer again, apply 9 to 15 times, and bake and cure each layer to form a film; obtain the cured enameled wire. (5) The cured enameled wire is cooled and then wound up to obtain the finished wire.

[0017] In some embodiments, the drawing step (1) requires controlling the wire compression ratio. In the first drawing process, the compression ratio is controlled at more than 25%, and the compression ratio of subsequent passes is 15-20% to allow for metallurgical bonding between steel and copper.

[0018] During fine-gauge wire drawing, the drawing rollers are in a low-slip state, and the mutual friction between the wire and the drawing rollers easily damages the wire itself, resulting in scratches. To address this issue, improvements are made in the following two aspects: a) ensuring the copper material is in a micro-slip state on the drawing rollers, with the slip coefficient controlled between 1.015 and 1.025; b) effectively improving the smoothness of the conductor by using nano-zirconia material instead of traditional ceramic spraying material. In the design of the drawing die, natural diamond is selected as the material. Based on the parameters of existing drawing equipment, a compression angle of 15-17° is customized to maintain the uniformity of the copper layer thickness during drawing; the diameter length is fixed at 0.40-0.50D to ensure the surface finish of the conductor wire in the semi-finished product.

[0019] The annealing process adopts online tubular annealing. The annealing temperature of ordinary copper and aluminum is about 400~500℃, and the annealing tubes used are usually ordinary stainless steel tubes with a temperature resistance of about 600℃. The annealing temperature of copper-clad steel reaches about 750~800℃, and 304 stainless steel tubes are used instead to enhance the temperature resistance of the annealing tubes and overcome deformation due to cold expansion and contraction during long-term operation.

[0020] During the coating process, the bending caused by the hardening of the copper-clad steel material during wire drawing can lead to unstable tension throughout the winding process. To stabilize the tension, a tensioning roller is added before coating, with a speed difference between it and the take-up roller, controlled at a ratio of 0.97-0.99. Polycrystalline material coating molds are used to reduce resistance during the coating process and prevent conductor bending and wire breakage. The adhesive coating is applied 1-3 times, and the oil-resistant coating is applied 9-15 times, with each layer of insulating varnish cured at a high temperature above 500℃.

[0021] The surface lubricant coating consists of 7-8% food-grade paraffin wax, 10-12% natural beeswax, 3-5% natural tea tree oil, 30-35% 120# solvent oil, and 35-40% high-boiling-point petroleum ether. During surface coating, the oil temperature is controlled at 50-60℃. The enameled wire is quantitatively controlled by a roller servo motor, with a roller speed of 2.5-3.0 r / min, precisely controlling the surface lubricant content of the enameled wire to be 50-80 mg / m³. 2 It effectively controls the lubrication of the enameled wire winding process, stabilizes the winding tension, reduces winding resistance, and does not affect the adhesion of insulating tape to the surface when winding into the final product.

[0022] In some embodiments, the coating on the finished product line, after curing, meets the requirements of 30% elongation and no cracking after 1D winding.

[0023] In some embodiments, the oil-resistant coating of the finished product line is designed to withstand long-term high temperatures in an oily environment without corrosion.

[0024] Beneficial effects (1) Excellent adhesion performance; the industry standard requires adhesion of d-wound without cracking. By modifying the coating, the product can be stretched by 30% and still not crack when wound. This is far higher than the industry standard requirements and ensures high tension during product winding.

[0025] (2) Excellent oil resistance; after the product is soaked in oil, the relevant enameled wire properties are tested after drying at 120℃. The breakdown voltage decreases by about 80%, and the pinhole performance decreases by little. This test is a test requirement designed by a specific customer and is not required in the current industry standard.

[0026] (3) High strength and high tensile strength; the tensile strength of ordinary copper wire in the soft state is about 260 MPa, while that of copper-clad steel in the soft state is more than 550 MPa. The tensile strength is more than twice that of copper wire, which meets the requirements of high tension in winding.

[0027] (4) Excellent chemical resistance; after being soaked in solvent, the hardness of the paint film reaches 5H, which is 4 levels higher than the current industry standard requirement of H.

[0028] (5) By using different insulation material thickness ratios, the adhesion of wire insulation material can be improved while meeting the requirements of oil resistance. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the structure of the high-adhesion, oil-resistant copper-clad steel enameled round wire of the present invention. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This invention utilizes copper-clad steel, which has a higher tensile strength than copper, as a conductor, and coats its surface with a high adhesion layer and an oil-resistant coating to form an electromagnetic wire product.

[0033] Example 1 like Figure 1 As shown, a high-adhesion, oil-resistant copper-clad steel enameled round wire includes a copper-clad steel conductor 11, an adhesion coating 12, and an oil-resistant coating 13. The copper-clad steel conductor 11 is composed of steel wire 111 and a copper layer 112.

[0034] The material used for the attachment coating 12 is polyamide composite insulating varnish; the material used for the oil-resistant coating 13 is 220 grade polyamide-imide insulating varnish, and the material selected is 595 / 30kps enameled wire insulating varnish from Allentas Electrical Insulation Materials Co., Ltd.

[0035] The formula for the polyamide composite insulating varnish in this invention includes, taking the preparation of 1 ton of insulating varnish as an example, the specific weights of the materials are as follows: Nylon 12 (110kg), E-20 epoxy resin (43kg), DMT methyl terephthalate (21kg), glycerin (11kg), THEIC (5kg), additives (6kg) (catalyst - zinc acetate, stabilizer - antimony trioxide, curing agent - butyl terephthalate, leveling agent - acrylates, antioxidant - hindered phenols 1010), m / p-cresol (402kg), xylene (402kg).

[0036] The mixed solvent obtained by mixing m / p-cresol and xylene in a weight ratio of 1:1 is used in the following preparations in the following amounts: 1 / 3 for the first use, 1 / 4 for the second use, and the remainder for the third use.

[0037] The preparation method of the polyamide composite insulating varnish of the above formulation includes: (a) adding glycerol, DMT, THEIC and catalyst into a reaction vessel, performing an ester exchange reaction at 180°C for 2 hours, increasing the temperature to 220°C for a polycondensation reaction for 3 hours, and maintaining negative pressure in the condenser during the reaction process; diluting the resin viscosity at a 1:1 ratio, controlling the viscosity at 5000~10000 mpa.s, measuring every 30 minutes, and when the reaction viscosity meets the standard, adding a terminator - triphenyl phosphite to terminate the chemical reaction, thus obtaining polyester resin; transferring the reacted polyester resin to a dilution vessel, adding 1 / 3 m / p-cresol and xylene mixed solvent and stirring vigorously to completely dissolve the resin, and cooling to obtain a heat-resistant polyester resin solution with a solid content of 40~50%.

[0038] (b) Add m / p-cresol and xylene mixed solvent to 1 / 4 of the reaction vessel, slowly add nylon 12 powder, gradually raise the temperature to 90°C and maintain the temperature, and continue stirring for 4 hours until the nylon is completely dissolved to obtain nylon resin solution.

[0039] (c) Add the remaining m / p-cresol and xylene mixed solvent to the reactor, heat to 60~80℃, add E-20 epoxy resin, stir for 3~4h until completely dissolved, and obtain the dissolved epoxy resin solution.

[0040] (d) Mixing and blending: The dissolved epoxy resin solution is slowly added to the nylon resin solution and stirred at high speed for 1 to 2 hours. Then, it is added to the heat-resistant polyester solution and stirred for another 1 to 2 hours to form a stable composite resin solution.

[0041] (e) Add additives to the composite resin solution and stir until homogeneous; then filter using a high-precision filter to remove impurities; then dilute with a mixed solvent of m / p-cresol and xylene to adjust the viscosity of the paint to 1500~2500 mPa.s (30°C).

[0042] The present invention discloses a method for preparing a high-adhesion, oil-resistant copper-clad steel enameled round wire, comprising: the electromagnetic wire, wherein the specification selected in the example is 0.20~0.50mm.

[0043] The above-mentioned method for preparing electromagnetic wire includes the following steps: Step S1: Prepare the alloy blank. A 12.0mm steel core is coated with a 0.6*193mm copper strip to form copper-clad steel. This is then drawn with a higher compression ratio to bond the steel and copper metals, drawing it to approximately 2.5mm. It is then annealed at a high temperature (above 800℃) in a well chamber to achieve a soft state. During the preparation of the copper-clad steel blank, the drawing compression ratio of the steel core and copper strip needs to be carefully controlled. In the first drawing pass, the compression ratio is controlled above 25%, while subsequent passes use a compression ratio of 15-20% to allow for metallurgical bonding between the steel and copper.

[0044] Step S2: Fabricate the electromagnetic wire conductor. A soft 2.50mm masterbatch is drawn to approximately 0.8mm or 1.20mm, then subjected to tubular high-temperature annealing at over 700℃ to soften it further, and finally drawn to the desired specifications. During the fine-gauge wire drawing process, the drawing rollers are in a low-slip state, and the mutual friction between the wire and the rollers easily damages the wire itself. The slip coefficient is controlled between 1.015 and 1.025. By using nano-zirconia material instead of traditional ceramic spraying material, the smoothness of the conductor is effectively improved.

[0045] In the design of the wire drawing die, the material selected is a single-crystal natural diamond with small grains. Based on the parameters of the existing wire drawing equipment, the compression angle α is customized to be 15~17°, and the fixed diameter length is 0.40~0.50D to ensure the surface smoothness of the conductor wire diameter of the semi-finished product.

[0046] Step S3: The semi-finished product, which has been drawn to the required size, is annealed in a tubular high-temperature environment at a temperature above 750°C until it becomes soft. Then, it is washed with deionized water, cooled, blown dry, and dried.

[0047] Step S4: Apply an adhesion layer to the surface of the annealed soft copper-clad steel wire 1 to 3 times; then apply an oil-resistant layer 9 to 15 times; dry and cure after each application.

[0048] Step S5: After the enameled wire has been cooled by air, a high-concentration lubricant is applied to its surface until the finished product is wound up.

[0049] The aforementioned specially made steel core uses a low-carbon, low-sulfur, and low-phosphorus steel core as its body. The carbon content of the steel core is less than 0.2%. During the forging process, trace amounts of elements such as Si, Mn, Cr, and Ni are added to make it more flexible after annealing, making it suitable for the enameled wire industry. Its chemical composition and mass percentage are as follows: C: 0.15~0.20%, Si: 0.15~0.25%, Mn: 0.70~0.90%, P≤0.02%, S≤0.01%, Cr≤0.03%, Ni≤0.015%, Cu≤0.015%, with the balance being Fe and unavoidable impurities.

[0050] The copper strip mentioned above is T2 copper, which has the following advantages: copper content of over 99.95%, easy to obtain a smooth surface after drawing, and good corrosion resistance, which are important factors in ensuring product performance.

[0051] The chemical composition of the copper strip in this embodiment is shown in the table below: .

[0052] The above annealing process adopts online tubular annealing. The annealing temperature of ordinary copper and aluminum is about 400~500℃, and the annealing tubes used are usually ordinary stainless steel tubes with a temperature resistance of about 600℃. The annealing temperature of copper-clad steel reaches about 750~800℃, and 304 stainless steel tubes are used instead to enhance the temperature resistance of the annealing tubes and overcome deformation due to cold expansion and contraction during long-term operation.

[0053] The aforementioned high-adhesion insulating material is prepared by modifying existing insulating resin with the addition of epoxy resin and heat-resistant resin components. After high-temperature curing, it strongly adheres to the surface of the copper layer. The aforementioned oil-resistant insulating material is prepared by modifying existing PAI insulating resin with the addition of additive components. After high-temperature curing, its oil resistance is significantly improved.

[0054] During the coating process, the bending caused by the hardening of the copper-clad steel material during wire drawing can lead to unstable tension throughout the winding process. To stabilize the tension, a tensioning roller is added before coating, with a speed difference between it and the take-up roller, controlled at a ratio of 0.97-0.99. Polycrystalline material coating molds are used to reduce resistance during the coating process and prevent conductor bending and wire breakage. The adhesive coating is applied 1-3 times, and the oil-resistant coating is applied 9-15 times, with each layer of insulating varnish cured at a high temperature above 500℃.

[0055] The surface lubricant coating in this invention comprises 7-8% food-grade paraffin wax, 10-12% natural beeswax, 3-5% natural tea tree oil, 30-35% 120# solvent oil, and 35-40% high-boiling-point petroleum ether. During surface coating, the oil temperature is controlled at 50-60℃, and the enameled wire is quantitatively controlled by a roller servo motor at a roller speed of 2.5-3.0 r / min, precisely controlling the surface lubricant content of the enameled wire to be 50-80 mg / m³. 2 It effectively controls the lubrication of the enameled wire winding process, stabilizes the winding tension, reduces winding resistance, and does not affect the adhesion of insulating tape to the surface when winding into the final product.

[0056] The high-adhesion, oil-resistant copper-clad steel enameled wire prepared above meets the following requirements: .

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-adhesion, oil-resistant copper-clad steel enameled round wire, characterized in that, This includes copper-clad steel conductor coating, adhesive coating, and oil-resistant coating; The material used for the coating is polyamide composite insulating varnish; The polyamide composite insulating varnish formulation, calculated by weight percentage, includes: The composition of the product is as follows: Nylon 12 (10-12%), E-20 epoxy resin (3-5%), methyl terephthalate (DMT) (2-2.5%), glycerin (1-1.7%), THEIC (0.3-0.5%), additives (0.5-1%), m- / p-cresol (40-42%), and xylene (40-42%). The additives are catalysts, stabilizers, curing agents, leveling agents, and antioxidants; The oil-resistant coating uses polyamide-imide insulating varnish.

2. The high-adhesion, oil-resistant copper-clad steel enameled round wire according to claim 1, characterized in that, The insulation thickness of the attached coating accounts for 5-15% of the total insulation layer, and the insulation thickness of the oil-resistant coating accounts for 85-95% of the total insulation layer.

3. The high-adhesion, oil-resistant copper-clad steel enameled round wire according to claim 1, characterized in that, The preparation method of the polyamide composite insulating varnish includes: (a) Glycerol, DMT, THEIC, and catalyst are added to a reaction vessel and subjected to transesterification at 180℃~210℃ for 1.5h~2h. The temperature is then increased to 220℃~250℃ for polycondensation for 2~4h. The condenser is kept under negative pressure during the reaction. The resin viscosity is diluted 1:1 and controlled at 5000~10000 mPa·s. The viscosity is measured every 30min~40min. When the reaction viscosity meets the standard, triphenyl phosphite is added as a terminator to terminate the chemical reaction, thus obtaining polyester resin. The reacted polyester resin is transferred to a dilution vessel, mixed solvent is added and stirred vigorously to completely dissolve the resin. After cooling, a heat-resistant polyester resin solution with 40~50% solid content is obtained. (b) Add the mixed solvent to the reactor, slowly add nylon 12 powder, gradually raise the temperature to 80℃~90℃ and maintain the temperature, and continue stirring for 3h~5h until the nylon is completely dissolved to obtain the nylon resin solution. (c) Add the mixed solvent to the reactor, heat to 60℃~80℃, add E-20 epoxy resin, stir for 3h~4h until completely dissolved, and obtain the dissolved epoxy resin solution. (d) Mixing and blending: The dissolved epoxy resin solution is slowly added to the nylon resin solution and stirred at high speed for 1 to 2 hours. Then, it is added to the heat-resistant polyester solution and stirred for another 1 to 2 hours to form a stable composite resin solution. (e) Add additives to the composite resin solution and stir until homogeneous; then filter using a filter to remove impurities; then dilute with a mixed solvent of m / p-cresol and xylene to adjust the viscosity of the paint to 1500~2500 mPa.s (30°C). The mixed solvent is obtained by mixing m / p-cresol and xylene in a weight ratio of 0.9-1:0.9-1; wherein the first dosage is 0.3-0.35% of the total; the second dosage is 0.22-0.26% of the total; and the third dosage is the balance.

4. The high-adhesion, oil-resistant copper-clad steel enameled round wire according to claim 1, characterized in that, The chemical composition and mass percentage of steel in the copper-clad steel conductor are as follows: C: 0.15~0.20%, Si: 0.15~0.25%, Mn: 0.70~0.90%, P≤0.02%, S≤0.01%, Cr≤0.03%, Ni≤0.015%, Cu≤0.015%, with the balance being Fe and unavoidable impurities; The copper used in the copper-clad steel conductor is T2 copper with a copper content of ≥99.95% as the conductor blank; The conductivity of the copper-clad steel conductor is 40% IACS.

5. A method for preparing a high-adhesion, oil-resistant copper-clad steel enameled round wire, characterized in that, include: (1) Copper strips are welded around steel wires and then drawn and subjected to high-temperature annealing to obtain soft copper-clad steel base material; (2) The copper-clad steel base material is further drawn to obtain wires of the required size; (3) The specified yarn is subjected to online high-temperature annealing, cleaning, cooling, blowing dry, and baking; (4) Coat the surface of the standard wire treated in step (3) with an adhesion layer, apply 1 to 3 times, and bake and cure each layer to form a film; coat the surface of the standard wire with the adhesion layer with an oil-resistant layer again, apply 9 to 15 times, and bake and cure each layer to form a film; obtain the cured enameled wire. (5) The cured enameled wire is cooled and then wound up to obtain the finished wire.

6. The method for preparing a high-adhesion, oil-resistant copper-clad steel enameled round wire according to claim 5, characterized in that, The drawing step (1) requires controlling the wire compression ratio. In the first drawing process, the compression ratio is controlled at more than 25%, and the compression ratio of subsequent passes is 15-20% to allow the steel and copper to be metallurgically bonded.

7. The method for preparing a high-adhesion, oil-resistant copper-clad steel enameled round wire according to claim 5, characterized in that, In step (2), the copper material is in a state of slight sliding on the drawing roller during the further drawing process, and the sliding coefficient is controlled between 1.015 and 1.025; nano-zirconia material is used to replace the ceramic spraying material.

8. The method for preparing a high-adhesion, oil-resistant copper-clad steel enameled round wire according to claim 7, characterized in that, The customized compression angle of the drawing die is α, which is 15~16°; the fixed warp length is 0.40~0.50D.

9. The method for preparing a high-adhesion, oil-resistant copper-clad steel enameled round wire according to claim 5, characterized in that, The online high-temperature annealing temperature in step (3) is 750℃-800℃.

10. The method for preparing a high-adhesion, oil-resistant copper-clad steel enameled round wire according to claim 5, characterized in that, The finished production line also needs to be coated with a surface lubricant; The lubricant is formulated as follows: 7-8% food-grade paraffin wax, 10-12% natural beeswax, 3-5% natural tea tree oil, 30-35% 120# solvent oil, and 35-40% high-boiling-point petroleum ether.

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