Abrasion-resistant enameled copper wire and method for manufacturing the same

Abstract

The application provides a wear-resistant enameled copper wire and a preparation method thereof, and belongs to the technical field of enameled copper wires.The preparation method comprises the following steps: repeatedly coating wear-resistant paint on a copper wire and curing the wear-resistant paint into a paint film, and then cooling and winding the copper wire to obtain the wear-resistant enameled copper wire.The preparation method of the wear-resistant paint comprises the following steps: adding 4,4'-diamino-4"-hydroxytriphenylmethane and 2,2-bis-[4-(4-aminophenoxy)phenyl]propane into a polymerization bottle, adding N,N-dimethylacetamide, stirring and dissolving, adding 3,3',4,4'-benzophenonetetracarboxylic dianhydride, stirring and polymerizing, and obtaining a polyamic acid solution one; adding 4,4'-diamino diphenyl ether into the polymerization bottle, adding N,N-dimethylacetamide, stirring and dissolving, adding pyromellitic dianhydride, stirring and polymerizing, and obtaining a polyamic acid solution two; adding the polyamic acid solution one and the polyamic acid solution two into the polymerization bottle, adding a silane coupling agent, stirring, adding N,N-dimethylacetamide and a peroxide initiator, and stirring uniformly to obtain the wear-resistant paint; and the wear resistance of the wear-resistant enameled copper wire can be effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of enameled copper wire, and particularly relates to a wear-resistant enameled copper wire and a preparation method thereof. BACKGROUND

[0002] Enameled wire is an important "electrical insulating material", which is prepared by coating a metal wire such as copper, aluminum, manganese copper alloy, etc. with a specific production process with a high polymer insulating paint, and the specific insulating paint is enameled wire paint. Enameled wire is mainly used as a winding coil, and its function is to realize the conversion of "electric" and "magnetic" energy during the operation of components. The insulating layer (i.e. enameled wire paint film) coated on the enameled wire should have good thermal, electrical, mechanical and chemical resistance.

[0003] Enameled wire is mainly used in electronics, electrical engineering and electrical equipment, such as motors, household appliances, electronic instruments, etc. In some specific applications, some special specifications of enameled wire are required, such as MP3, electronic watches, micro accumulators, electronic instruments, palm computers, etc., which require fine-diameter enameled wire; artificial heart pacemakers, speaker voice coils, microwave oven transformers, which require lightweight enameled wire; buzzer, micro-electric appliance, electronic transformer, color TV deflection, which require self-adhesive enameled wire. With the rapid development of industry, the electronics, electrical and electrical engineering fields are developing rapidly, and almost all kinds of equipment, instruments and meters related to electricity cannot do without enameled wire, so enameled wire paint is an irreplaceable industrial material.

[0004] In existing practical applications, new energy vehicle motors need to operate under high speed (>10,000 rpm) and frequent start-stop conditions, and the enameled wire winding bears dynamic stress, and the surface paint film is prone to local peeling due to friction, affecting the insulation performance; wind power generators are long-term operated under strong wind load and temperature difference change (-40℃~120℃), and the enameled wire is prone to micro-cracks due to high-frequency friction with the stator slot wall; industrial motors (such as machine tool spindle motors) are operated under high dynamic load and continuous vibration conditions, and the enameled wire is prone to wear failure due to the intensified friction with the core slot. It can be seen that the enameled copper wire has particularly high requirements for wear resistance in the fields of new energy vehicle drive motors, wind turbine generators, industrial high-speed devices, high-frequency transformers, aerospace wire bundles and smart grid high-frequency cables due to dynamic mechanical stress, high-frequency vibration or extreme environmental effects. Therefore, improving wear resistance is a topic worth continuous research. SUMMARY

[0005] To solve the problems in the background art, the application provides a wear-resistant enameled copper wire and a preparation method thereof, which can effectively improve the wear resistance.

[0006] In order to achieve the above object, the present application provides a preparation method of abrasion-resistant enamel copper wire, which comprises the following steps: coating abrasion-resistant enamel on copper wire for multiple times, curing the enamel into enamel film, cooling and winding the enamel film, and obtaining the abrasion-resistant enamel copper wire.

[0007] S1, 4, 4'-diamino-4"-hydroxytriphenylmethane and 2, 2-bis-[4-(4-aminophenoxy) phenyl] propane are added into a polymerization bottle, then N, N-dimethylacetamide is added, and after stirring and dissolving completely at room temperature, 3, 3', 4, 4'-benzophenone tetracarboxylic dianhydride is added, and the polymerization is stirred in an ice water bath for 3-3.5 h to obtain a polyamic acid solution one with a solid content of 20-22%;

[0008] S2, 4, 4'-diamino diphenyl ether is added into a polymerization bottle, then N, N-dimethylacetamide is added, and after stirring and dissolving completely at room temperature, pyromellitic dianhydride is added, and the polymerization is stirred in an ice water bath for 7.5-8 h to obtain a polyamic acid solution two with a solid content of 27-30%;

[0009] S3, the polyamic acid solution one obtained in S1 and the polyamic acid solution two obtained in S2 are added into a polymerization bottle to obtain a polyamic acid mixed solution, then a silane coupling agent is added and stirred at room temperature, and then N, N-dimethylacetamide and a peroxide initiator are added and stirred uniformly to obtain the abrasion-resistant enamel; the silane coupling agent contains acryloyloxy group.

[0010] Further, in S1, the molar ratio of 4, 4'-diamino-4"-hydroxytriphenylmethane, 2, 2-bis-[4-(4-aminophenoxy) phenyl] propane and 3, 3', 4, 4'-benzophenone tetracarboxylic dianhydride is 0.5:0.5:(1-1.05).

[0011] Further, in S2, the molar ratio of 4, 4'-diamino diphenyl ether and pyromellitic dianhydride is 1:(1-1.05).

[0012] Further, in S3, the mass ratio of the polyamic acid solution one and the polyamic acid solution two is (3-3.5):1.

[0013] Further, in S3, the mass of the silane coupling agent is 5-7% of the mass of the polyamic acid solution one.

[0014] Further, the silane coupling agent is γ-methacryloyloxypropyltrimethoxysilane.

[0015] Further, the mass of the peroxide initiator is 2-3% of the mass of the silane coupling agent.

[0016] Further, the peroxide initiator includes dicumyl peroxide or benzoyl peroxide.

[0017] Further, the solid content of the wear-resistant paint is 15-18%.

[0018] In a second aspect, the application provides a wear-resistant enameled copper wire prepared by the above method.

[0019] The application has the following beneficial effects:

[0020] In the application, the diamine (4,4'-diamino-4"-hydroxytriphenylmethane, 2,2-bis-[4-(4-aminophenoxy)phenyl]propane) and the dianhydride (3,3',4,4'-benzophenonetetracarboxylic dianhydride) undergo step-by-step polymerization in a polar solvent (N,N-dimethylacetamide) to generate polyamic acid one, which mainly contains hydroxyl groups (the side chain hydroxyl groups of 4,4'-diamino-4"-hydroxytriphenylmethane are directly introduced into the polymer) and flexible chain segments (the ether bond and propane spacer of 2,2-bis-[4-(4-aminophenoxy)phenyl]propane endow the main chain with flexibility);

[0021] 4,4'-diamino diphenyl ether and pyromellitic dianhydride are both aromatic monomers, which undergo step-by-step polymerization in a polar solvent (N,N-dimethylacetamide) to generate polyamic acid two, and the main chain is composed of continuous benzene rings and amide bonds after polycondensation, forming a rigid rod structure, and the π-π conjugation of the benzene ring and the resonance effect of the amide bond synergistically enhance the rigidity of the chain segment, so that polyamic acid two mainly contains rigid chain segments;

[0022] When the mass ratio of polyamic acid solution one and polyamic acid solution two is (3-3.5):1, there are enough flexible chain segments for γ-methacryloyloxypropyl trimethoxysilane to bond and form a high cross-linking density polyacrylate structure in the subsequent curing process, fix the molecular chain conformation, inhibit the movement of the chain segment through the steric hindrance effect, increase the proportion of rigid chain segments, and further synergistically improve the wear resistance. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 In the test example of the application, the test data comparison trend chart of the wear amount (g) of the enameled copper wire prepared in Examples 1-3 and Comparative Examples 1-5 under the test environment (temperature 25±2℃, humidity 50±5%) and test conditions (700g load / 300r / min) is shown. DETAILED DESCRIPTION

[0024] The application will be further described in detail below in combination with the examples.

[0025] The raw materials of the examples and comparative examples of the application are all ordinary commercial products unless otherwise specified.

[0026] Example 1: (1) Wear-resistant paint was prepared by the following method:

[0027] S1, 4,4'-diamino-4"-hydroxytriphenylmethane and 2,2-bis-[4-(4- aminophenoxy)phenyl]propane were added into a polymerization bottle, then N,N- dimethylacetamide was added, and after stirring and dissolving completely at room temperature, 3,3',4,4'-benzophenonetetracarboxylic dianhydride was added, and the polymerization was stirred at a speed of 150 r / min in an ice water bath for 3.2 h to obtain a polyamic acid solution one, and the solid content was 21%. The molar ratio of 4,4'-diamino-4"-hydroxytriphenylmethane, 2,2-bis-[4-(4- aminophenoxy)phenyl]propane and 3,3',4,4'-benzophenonetetracarboxylic dianhydride was 0.5:0.5:1.03.

[0028] S2, 4,4'-diamino diphenyl ether was added into a polymerization bottle, then N,N- dimethylacetamide was added, and after stirring and dissolving completely at room temperature, pyromellitic dianhydride was added, and the polymerization was stirred at a speed of 150 r / min in an ice water bath for 7.8 h to obtain a polyamic acid solution two, and the solid content was 28%. The molar ratio of 4,4'-diamino diphenyl ether and pyromellitic dianhydride was 1:1.03.

[0029] S3, the polyamic acid solution one obtained in S1 and the polyamic acid solution two obtained in S2 were added into a polymerization bottle at a mass ratio of 3.3:1, and stirred at a speed of 200 r / min for 10 min to ensure that the two solutions were fully miscible to obtain a polyamic acid mixed solution; then γ-methacryloyloxypropyl trimethoxysilane was added, and the mass of the γ-methacryloyloxypropyl trimethoxysilane was 6% of the mass of the polyamic acid solution one, and stirred at room temperature, and the stirring speed was increased to 320 r / min, and stirred at a uniform speed for 20 min to promote the bonding reaction of the γ-methacryloyloxypropyl trimethoxysilane and the hydroxyl group; then N,N-dimethylacetamide and dicumyl peroxide were added, and the mass of the dicumyl peroxide was 2.5% of the mass of the γ-methacryloyloxypropyl trimethoxysilane, and the stirring speed was maintained at 320 r / min, and stirred for 10 min to ensure uniform stirring and to ensure that the initiator was completely dissolved and uniformly dispersed, thereby obtaining a wear-resistant paint, and the solid content was 16%.

[0030] (2) The wear-resistant paint-coated copper wire was prepared by the following method according to the prior art: the wear-resistant paint was coated on the copper wire for multiple times and cured into a paint film, and then cooled and wound, thereby obtaining the wear-resistant paint-coated copper wire.

[0031] Specifically, a large-capacity wire releasing device is adopted, and the tension control system is used to ensure the smooth release of the copper wire, so as to avoid the copper wire from being thinned or jumping due to uneven tension, and the tension is controlled to be less than 50% of the yield strength of the copper wire material. The inert gas protection annealing furnace is annealed at about 450°C (0.1 mm wire diameter corresponds to 12 seconds), so as to eliminate the cold work hardening of the copper wire, restore the softness and remove the surface lubricant residue. After annealing, the surface of the copper wire is cleaned by using deionized water ultrasonic cleaning, so as to ensure that there is no oil stain and oxide residue. Then, the wear-resistant paint prepared in (1) is coated by using the immersion coating method, and each coating needs to be preliminarily cured, the total coating times is 5, the paint film thickness tolerance is ≤1 μm, and the surface is free of bubbles and stripes. Then, the paint is cured by baking in sections, air-cooled, and the wire is collected.

[0032] Example 2: The difference between this example and Example 1 is that (1) the wear-resistant paint is prepared by the following method:

[0033] S1, 4,4'-diamino-4"-hydroxytriphenylmethane and 2,2-bis-[4-(4-aminophenoxy) phenyl] propane are added to a polymerization bottle, then N,N-dimethylacetamide is added, and after stirring and dissolving completely at room temperature, 3,3',4,4'-benzophenone tetracarboxylic dianhydride is added, and stirring is carried out in an ice water bath for 3 h to obtain a polyamic acid solution one, and the solid content thereof is 20%. Among them, the molar ratio of 4,4'-diamino-4"-hydroxytriphenylmethane, 2,2-bis-[4-(4-aminophenoxy) phenyl] propane and 3,3',4,4'-benzophenone tetracarboxylic dianhydride is 0.5:0.5:1.02.

[0034] S2, 4,4'-diamino diphenyl ether is added to a polymerization bottle, then N,N-dimethylacetamide is added, and after stirring and dissolving completely at room temperature, pyromellitic dianhydride is added, and stirring is carried out in an ice water bath for 7.5 h to obtain a polyamic acid solution two, and the solid content thereof is 27%. Among them, the molar ratio of 4,4'-diamino diphenyl ether and pyromellitic dianhydride is 1:1.02.

[0035] S3, the polyamic acid solution one obtained in S1 and the polyamic acid solution two obtained in S2 are added to a polymerization bottle in a mass ratio of 3:1 to obtain a polyamic acid mixed solution; then γ-methacryloyloxypropyltrimethoxysilane is added, and the mass of the γ-methacryloyloxypropyltrimethoxysilane is 5% of the mass of the polyamic acid solution one, and stirring is carried out at room temperature; then N,N-dimethylacetamide and dicumyl peroxide are added, and the mass of the dicumyl peroxide is 2% of the mass of the γ-methacryloyloxypropyltrimethoxysilane, and stirring is carried out uniformly, thereby obtaining the wear-resistant paint, and the solid content thereof is 15%.

[0036] Example 3: The difference between this example and Example 1 is that (1) the wear-resistant paint is prepared by the following method:

[0037] S1, 4, 4'-diamino-4"-hydroxytriphenylmethane and 2, 2-bis-[4-(4- aminophenoxy) phenyl] propane were added into a polymerization bottle, then N, N- dimethylacetamide was added, and after stirring and dissolving completely at room temperature, 3, 3', 4, 4'-benzophenone tetracarboxylic dianhydride was added, and the polymerization was stirred in an ice water bath for 3.5 h to obtain a polyamic acid solution one, and the solid content was 22%. Among them, the molar ratio of 4, 4'-diamino-4"-hydroxytriphenylmethane, 2, 2-bis-[4-(4- aminophenoxy) phenyl] propane and 3, 3', 4, 4'-benzophenone tetracarboxylic dianhydride was 0.5:0.5:1.05.

[0038] S2, 4, 4'-diamino diphenyl ether was added into a polymerization bottle, then N, N- dimethylacetamide was added, and after stirring and dissolving completely at room temperature, pyromellitic dianhydride was added, and the polymerization was stirred in an ice water bath for 8 h to obtain a polyamic acid solution two, and the solid content was 30%. Among them, the molar ratio of 4, 4'-diamino diphenyl ether and pyromellitic dianhydride was 1:1.05.

[0039] S3, the polyamic acid solution one obtained in S1 and the polyamic acid solution two obtained in S2 were added into a polymerization bottle at a mass ratio of 3.5:1 to obtain a polyamic acid mixed solution; then γ-methacryloyloxypropyl trimethoxysilane was added, and the mass of the γ-methacryloyloxypropyl trimethoxysilane was 7% of the mass of the polyamic acid solution one, and stirring was carried out at room temperature; then N, N-dimethylacetamide and dicumyl peroxide were added, and the mass of the dicumyl peroxide was 3% of the mass of the γ-methacryloyloxypropyl trimethoxysilane, and stirring was carried out uniformly, thereby obtaining a wear-resistant paint, and the solid content was 18%.

[0040] Comparative Example 1: The difference between this comparative example and Example 1 is that the γ-methacryloyloxypropyl trimethoxysilane and the dicumyl peroxide are deleted; and the mass ratio of the polyamic acid solution one and the polyamic acid solution two is 2:1.

[0041] Specifically, in the preparation of the wear-resistant paint, S3, the polyamic acid solution one obtained in S1 and the polyamic acid solution two obtained in S2 were added into a polymerization bottle at a mass ratio of 2:1 to obtain a polyamic acid mixed solution; then N, N-dimethylacetamide was added, and stirring was carried out uniformly, thereby obtaining a wear-resistant paint, and the solid content was 16%.

[0042] Comparative Example 2: The difference between this comparative example and Example 1 is that the γ-methacryloyloxypropyl trimethoxysilane and the dicumyl peroxide are deleted.

[0043] Specifically, in the preparation of the wear-resistant paint, S3, the polyamic acid solution one obtained in S1 and the polyamic acid solution two obtained in S2 were added into a polymerization bottle at a mass ratio of 3.3:1 to obtain a polyamic acid mixed solution; then N, N-dimethylacetamide was added, and stirring was carried out uniformly, thereby obtaining a wear-resistant paint, and the solid content was 16%.

[0044] Comparative Example 3: The difference between this comparative example and Example 1 is that the mass ratio of polyamide acid solution one and polyamide acid solution two is 2:1.

[0045] Specifically, in the preparation of the wear-resistant paint, S3, polyamide acid solution one obtained in S1 and polyamide acid solution two obtained in S2 are added into a polymerization bottle in a mass ratio of 2:1 to obtain a polyamide acid mixed solution; then γ-methacryloxypropyltrimethoxysilane is added, the mass of which is 6% of the mass of the polyamide acid solution one, and stirring is performed at room temperature; then N,N-dimethylacetamide and dicumyl peroxide are added, the mass of the dicumyl peroxide being 2.5% of the mass of the γ-methacryloxypropyltrimethoxysilane, and stirring is performed until uniform, to obtain the wear-resistant paint, the solid content of which is 16%.

[0046] Comparative Example 4: The difference between this comparative example and Example 1 is that dicumyl peroxide is deleted.

[0047] Specifically, in the preparation of the wear-resistant paint, S3, polyamide acid solution one obtained in S1 and polyamide acid solution two obtained in S2 are added into a polymerization bottle in a mass ratio of 3.3:1 to obtain a polyamide acid mixed solution; then γ-methacryloxypropyltrimethoxysilane is added, the mass of which is 6% of the mass of the polyamide acid solution one, and stirring is performed at room temperature; then N,N-dimethylacetamide is added, and stirring is performed until uniform, to obtain the wear-resistant paint, the solid content of which is 16%.

[0048] Comparative Example 5: The difference between this comparative example and Example 1 is that γ-methacryloxypropyltrimethoxysilane is replaced by γ-aminopropyltriethoxysilane.

[0049] Specifically, in the preparation of the wear-resistant paint, S3, polyamide acid solution one obtained in S1 and polyamide acid solution two obtained in S2 are added into a polymerization bottle in a mass ratio of 3.3:1 to obtain a polyamide acid mixed solution; then γ-aminopropyltriethoxysilane is added, the mass of which is 6% of the mass of the polyamide acid solution one, and stirring is performed at room temperature; then N,N-dimethylacetamide and dicumyl peroxide are added, the mass of the dicumyl peroxide being 2.5% of the mass of the γ-aminopropyltriethoxysilane, and stirring is performed until uniform, to obtain the wear-resistant paint, the solid content of which is 16%.

[0050] Test Example: Test object: the enameled copper wires prepared in Example 1-Example 3 and Comparative Example 1-Comparative Example 5.

[0051] Test item and method: According to the conventional wear resistance test standard of enameled wire (GB / T 6109 series), a reciprocating wear tester is used to test the wear amount (g) under the test environment (temperature 25±2℃, humidity 50±5%) and test conditions (700g load / 300r / min); the smaller the wear amount value, the better the wear resistance.

[0052] Test results: see Table 1.

[0053] Table 1. Test data of test examples

[0054] Wear (g) Example 1 0.011 Example 2 0.013 Example 3 0.013 Comparative Example 1 0.018 Comparative Example 2 0.025 Comparative Example 3 0.021 Comparative Example 4 0.023 Comparative Example 5 0.022

[0055] Result analysis: analyze examples 1-3 and combine Table 1 data and Figure 1 It can be seen that the abrasion loss test data of the enameled copper wire prepared by the present application (examples 1-3) is as low as 0.013g or less under the test environment (temperature 25±2℃, humidity 50±5%) and test conditions (700g load / 300r), indicating that the enameled copper wire prepared by the present application (examples 1-3) has excellent abrasion resistance.

[0056] Analyze examples 1 and comparative examples 1-5 and combine Table 1 data and Figure 1 Specific analysis as follows:

[0057] By comparing comparative example 1 and comparative example 2, it can be seen that increasing the mass ratio of polyamide acid solution one and polyamide acid solution two from 2:1 (comparative example 1) to 3.3:1 (comparative example 2) will result in a decrease in abrasion resistance of the enameled copper wire prepared. This is because the polymer in polyamide acid solution one mainly contains hydroxyl groups (-OH) and flexible segments, while the polymer in polyamide acid solution two mainly contains rigid segments. Flexible segments can absorb friction energy through elastic deformation, but if the proportion is too high, it will cause surface softening and accelerated wear, resulting in a decrease in abrasion resistance.

[0058] By comparing comparative example 1 and comparative example 3, it can be seen that when the mass ratio of polyamide acid solution one and polyamide acid solution two is 2:1, compared with comparative example 1, the introduction of γ-methacryloyloxypropyl trimethoxysilane and dicumyl peroxide in comparative example 3 also results in a decrease in abrasion resistance of the enameled copper wire prepared. This is because, on the one hand, the carboxylic acid groups (-COOH) in the polyamide acid mixed solution provide an acidic environment (pH≈4-5), which can directly catalyze the condensation of methoxyl groups (-OCH3) in γ-methacryloyloxypropyl trimethoxysilane with hydroxyl groups (-OH) on the surface of flexible segments to form Si-O- bonds and achieve chemical bonding; on the other hand, the rigid structure group acryloyloxy in γ-methacryloyloxypropyl trimethoxysilane forms a high crosslinking density polyacrylate structure during the subsequent curing process, fixing the molecular chain conformation and inhibiting chain segment movement through steric hindrance effect, making the chain segment rigid; when the mass ratio of polyamide acid solution one and polyamide acid solution two is 2:1, the proportion of flexible segments is not high enough, and if it is rigidified (consumed) again, the ability to absorb friction energy will decrease too much, resulting in a decrease in abrasion resistance.

[0059] In comparison with Example 1, it can be seen that when the mass ratio of polyamide acid solution one and polyamide acid solution two is 3.3:1, the introduction of γ-methacryloxypropyl trimethoxysilane and dicumyl peroxide can synergistically improve the wear resistance of the enameled copper wire. This is because when the mass ratio of polyamide acid solution one and polyamide acid solution two is 3.3:1, there are enough flexible chain segments for γ-methacryloxypropyl trimethoxysilane to combine (rigidization consumption), so that the proportion of rigid (rigidized) chain segments increases, thereby synergistically improving the wear resistance.

[0060] In comparison with Comparative Example 4-Comparative Example 5, it can be seen that when the mass ratio of polyamide acid solution one and polyamide acid solution two is 3.3:1, deleting dicumyl peroxide or replacing γ-methacryloxypropyl trimethoxysilane with γ-aminopropyl triethoxysilane cannot achieve the synergistic improvement effect on wear resistance in Example 1. This is because if dicumyl peroxide is deleted, the rigid structure group acryloyloxy in γ-methacryloxypropyl trimethoxysilane cannot successfully form a high cross-linking density polyacrylate structure in the subsequent curing process; if γ-methacryloxypropyl trimethoxysilane is replaced with γ-aminopropyl triethoxysilane, there is a lack of acryloyloxy that can self-polymerize, and the proportion of rigidized chain segments cannot be successfully increased.

[0061] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again by the present application.

[0062] In addition, various different embodiments of the present application can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present application, and they should also be considered as disclosed by the present application.

Claims

1. A method for preparing wear-resistant enameled copper wire, comprising repeatedly coating the copper wire with wear-resistant enamel and curing it into a enamel film, followed by cooling and winding to obtain the final product; characterized in that, The method for preparing the wear-resistant paint is as follows: S1. Add 4,4'-diamino-4"-hydroxytriphenylmethane and 2,2-bis-[4-(4-aminophenoxy)phenyl]propane to a polymerization flask, then add N,N-dimethylacetamide. After stirring and dissolving completely at room temperature, add 3,3',4,4'-benzophenone tetracarboxylic dianhydride. Stir and polymerize in an ice-water bath for 3-3.5 hours to obtain polyamic acid solution one with a solid content of 20-22%. S2. Add 4,4'-diaminodiphenyl ether to the polymerization flask, then add N,N-dimethylacetamide. After stirring and dissolving completely at room temperature, add pyromellitic dianhydride and stir and polymerize in an ice-water bath for 7.5-8 hours to obtain polyamic acid solution II with a solid content of 27-30%. S3. Add the polyamic acid solution one obtained in S1 and the polyamic acid solution two obtained in S2 to a polymerization bottle to obtain a polyamic acid mixed solution. Then add a silane coupling agent, stir at room temperature, and then add N,N-dimethylacetamide and a peroxide initiator. Stir until uniform to obtain the wear-resistant paint. The mass ratio of the polyamic acid solution one to the polyamic acid solution two is (3-3.5):

1. The silane coupling agent is γ-methacryloyloxypropyltrimethoxysilane.

2. The method for preparing wear-resistant enameled copper wire according to claim 1, characterized in that, In S1, the molar ratio of 4,4'-diamino-4"-hydroxytriphenylmethane, 2,2-bis-[4-(4-aminophenoxy)phenyl]propane and 3,3',4,4'-benzophenone tetracarboxylic dianhydride is 0.5:0.5:(1-1.05).

3. The method for preparing wear-resistant enameled copper wire according to claim 1, characterized in that, In S2, the molar ratio of 4,4'-diaminodiphenyl ether to pyromellitic dianhydride is 1:(1-1.05).

4. The method for preparing wear-resistant enameled copper wire according to claim 1, characterized in that, In S3, the mass of the silane coupling agent is 5-7% of the mass of the polyamic acid solution.

5. The method for preparing wear-resistant enameled copper wire according to claim 1, characterized in that, The mass of the peroxide initiator is 2-3% of the mass of the silane coupling agent.

6. The method for preparing wear-resistant enameled copper wire according to claim 1 or 5, characterized in that, The peroxide initiator includes dicumyl peroxide or benzoyl peroxide.

7. The method for preparing wear-resistant enameled copper wire according to claim 1, characterized in that, The solid content of the wear-resistant paint is 15-18%.

8. A wear-resistant enameled copper wire, characterized in that, It is prepared by the preparation method described in any one of claims 1-7.

Images