Preparation method and manufacturing equipment of modified polyester enameled woven flat wire

Abstract

The invention discloses a preparation method and manufacturing equipment of a modified polyester enameled woven flat wire. The modified polyester enameled woven flat wire prepared by the method comprises a woven flat wire body and a polyester wrapping layer, wherein the polyester wrapping layer is prepared from polyimide, high-ortho phenolic resin, silicon carbide, boron nitride, nano aluminum oxide, polyether sulfone, diisocyanate, a styrene-maleic anhydride copolymer, a solvent and a silane coupling agent according to a specific ratio. Through ultrasonic dispersion and high-speed shearing processes, uniform dispersion of the filler is ensured, and the coating thickness deviation is small. And a multi-stage gradient curing and segmented cooling technology is adopted, so that the internal stress is effectively reduced, and the coating is prevented from cracking. The invention also provides manufacturing equipment for realizing the preparation method, the manufacturing equipment comprises an equipment body and a controller, and the controller realizes automatic control of the preparation method by executing a computer program.

Description

Technical Field

[0001] The invention relates to the technical field of wires, and in particular to a preparation method and manufacturing equipment for a modified polyester enameled braided flat wire. Background Art

[0002] With the improvement of work level, the enameled wire industry has been well developed, and enameled wire is widely used in various fields. However, the existing enameled wire structure contains many paint layers, and each paint layer structure is composed of many single layers.

[0003] The current single-layer coating of enameled wire has the problem of uneven thickness distribution, which leads to insufficient consistency in overall structural performance, especially poor performance in high temperature resistance. Since the material is sensitive to temperature fluctuations, when the operating temperature exceeds the tolerance threshold, the coating is prone to softening and deformation, which in turn causes problems such as decreased adhesion and deterioration of insulation performance, ultimately significantly shortening the service life of the enameled wire. Summary of the invention

[0004] 1. Technical issues to be resolved In order to solve the above problems, the present invention proposes a method for preparing a modified polyester enameled braided flat wire and a manufacturing device, aiming to solve the problems of short service life and poor adhesion performance of the enameled wire in the prior art.

[0005] (II) Technical solution A method for preparing a modified polyester enameled braided flat wire of the present invention comprises: Braided flat wire body and polyester sheath; The formula ratio of the polyester wrapping layer includes: Polyimide 10-15%, high ortho-phenolic resin 18-25%, silicon carbide 8-15%, boron nitride 5-12%, nano-alumina 10-15%, polyether sulfone 6-8%, diisocyanate 3-4%, styrene-maleic anhydride copolymer 8-10%, solvent 3-5%, silane coupling agent 1-2%, The preparation process of the polyester wrapping layer comprises the following steps: S100, mixing silicon carbide, boron nitride, nano-alumina and a silane coupling agent, adding 50% of the total amount of solvent, performing ultrasonic dispersion and high-speed shearing to form a uniform slurry; S200, add polyimide, high-ortho-phenolic resin and polyethersulfone to the remaining solvent, and stir in 60°C constant temperature water until completely dissolved; S300, mixing the resin solution and the filler slurry, adding styrene-maleic anhydride copolymer, controlling the temperature at 80° C. and stirring continuously, adding diisocyanate, and stirring until the viscosity of the system is stable to obtain a mixed paint solution; S400, soak the copper wire in 10% dilute sulfuric acid solution to remove the surface oxide layer, dry in an oven for 10 minutes, and evenly apply the mixed paint solution to the surface of the flat wire body by dip coating, with a coating thickness of 10~15μm, preheat at 80℃ for 5 minutes, initially evaporate the solvent, and use electrostatic spraying for secondary coating, with a thickness of 5~8μm, and the voltage is set to 50kV to ensure a smooth surface; S500, using multi-stage gradient curing to cure the modified polyester enameled braided flat wire processed in step S400, and using segmented cooling to prevent thermal stress cracking of the modified polyester enameled braided flat wire.

[0006] In the present invention, the solvent is N-methylpyrrolidone.

[0007] In the present invention, in step S100, ultrasonic dispersion is performed at 40 kHz for 30 minutes, and high-speed shearing is performed at 5000 rpm for 20 minutes to form a uniform slurry; In step S200, the dissolution time is 1 to 2 hours.

[0008] In the present invention, in step S300, when styrene-maleic anhydride copolymer is added, the stirring speed is 300 rpm, and stirring is continued for 30 minutes. When diisocyanate is added, the stirring speed is 500 rpm, and stirring is continued for 10 minutes. When the viscosity of the system is 2000-3000 mPa·s, it is sufficient.

[0009] In the present invention, in step S400, the soaking time is 5 minutes, the drying time is 10 minutes, and when the mixed paint liquid is applied, the coating line speed is 10 to 15 m / min.

[0010] In the present invention, in step S500, the multi-stage curing includes: The first stage, 180℃ / 20 minutes, promotes the initial cross-linking of the resin; The second stage, 220℃ / 30min, enhances cross-linking density and filler bonding; The third stage, 250℃ / 15 minutes, forms a dense heat-resistant coating; Staged cooling includes: The first stage, 250℃-100℃, cooling rate ≤5℃ / min; In the second stage, forced air cooling is performed to room temperature.

[0011] Another manufacturing equipment for modified polyester enameled braided flat wire of the present invention is characterized in that it includes a manufacturing equipment body for modified polyester enameled braided flat wire and a controller, wherein the controller includes a processor and a computer program stored in a memory and executable on the processor, and when the processor executes the program, the steps of the method for preparing modified polyester enameled braided flat wire described in any one of claims 1 to 6 are implemented.

[0012] (III) Beneficial effects Compared with the prior art, the present invention has the following beneficial effects: In the present invention, through the synergistic effect of polyimide (PI), boron nitride (BN) and nano-aluminum oxide (Al2O3), the long-term temperature resistance reaches above 250°C (IEC 60317 standard), which is 40% higher than that of traditional polyester enameled wire (temperature resistance ≤180°C).

[0013] The present invention adopts ultrasonic dispersion (40kHz) + high-speed shearing (5000rpm) process, the filler is evenly dispersed, and the coating thickness deviation is ≤±5% (detected by laser thickness gauge), avoiding performance fluctuations caused by uneven thickness in traditional processes.

[0014] The introduction of silicon carbide (SiC) and silane coupling agent in the present invention increases the tensile strength to 180-220 MPa (ASTM D638), and the adhesion reaches level 1 (ASTM D3359 cross-cut method), which significantly prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the process structure of the preparation process; Figure 2 Schematic diagram of the framework structure of the manufacturing equipment.

[0017] 60. Processor, 61. Memory, 62. Communication interface, 63. Communication bus. DETAILED DESCRIPTION

[0018] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the present invention is described in conjunction with embodiments.

[0019] Example 1

[0020] Ratio 1: Polyimide (PI) 15%, high-ortho-phenolic resin 20%, silicon carbide (SiC) 12%, boron nitride (BN) 10%, nano-alumina (Al2O3) 12%, polyether sulfone 7%, diisocyanate 3.5%, styrene-maleic anhydride copolymer 8%, N-methylpyrrolidone 4.5%, silane coupling agent 2%.

[0021] The preparation process includes the following steps: S100, filler dispersion treatment: Silicon carbide (SiC), boron nitride (BN), nano-alumina (Al2O3) and silane coupling agent were mixed, 50% of the total amount of 4.5% N-methylpyrrolidone (NMP) was added, and ultrasonic dispersion at a frequency of 40kHz for 30 minutes and high-speed shearing at a speed of 5000rpm for 20 minutes were performed to form a uniform slurry; S200, pre-dissolving the resin: add polyimide (PI), high-ortho-phenolic resin and polyethersulfone (PES) to the remaining solvent and stir in a 60°C constant temperature water bath until completely dissolved (about 1 to 2 hours); S300, main mixing and toughening modification: the resin solution and the filler slurry are mixed, styrene-maleic anhydride copolymer (SMA) is added, the temperature is controlled at 80°C and the stirring speed is 300 rpm, and the stirring speed is continued for 30 minutes, diisocyanate is added, and the stirring equipment is stirred rapidly for 10 minutes at a speed of 500 rpm until the viscosity of the system is stable to obtain a mixed paint solution; It should be noted that the viscosity was measured by a Brookfield viscometer and was 2000~3000 mPa·s.

[0022] S400, braided flat wire pretreatment and coating: soak the copper wire in 10% dilute sulfuric acid solution for 5 minutes to remove the surface oxide layer, dry in a 120℃ oven for 10 minutes, and evenly coat the mixed paint liquid on the surface of the flat wire body by dip coating at a line speed of 12m / min, with a coating thickness of 10~15μm, preheat at 80℃ for 5 minutes to initially evaporate the solvent, and use electrostatic spraying for secondary coating with a thickness of 5~8μm and a voltage setting of 50kV to ensure a smooth surface; S500, curing and cooling: curing the modified polyester enameled braided flat wire obtained in step S400 through the following three stages: The first stage, 180℃ / 20 minutes, promotes the initial cross-linking of the resin; The second stage, 220℃ / 30min, enhances cross-linking density and filler bonding; The third stage, 250℃ / 15 minutes, forms a dense heat-resistant coating; The cured modified polyester enameled braided flat wire is cooled in sections in the following two stages: The first stage, 250℃-100℃, cooling rate ≤5℃ / min; In the second stage, forced air cooling is performed to room temperature.

[0023] Gradient curing (180℃→220℃→250℃) and segmented cooling (cooling rate ≤5℃ / min) effectively reduce internal stress and avoid coating cracking.

[0024] Example 2

[0025] Ratio 2: Polyimide (PI) 12%, high-ortho-phenolic resin 22%, silicon carbide (SiC) 15%, boron nitride (BN) 5%, nano-alumina (Al2O3) 15%, polyether sulfone 6%, diisocyanate 4%, styrene-maleic anhydride copolymer 10%, N-methylpyrrolidone 5%, silane coupling agent 1%.

[0026] The preparation method is the same as that in Example 1.

[0027] Example 3

[0028] Ratio 3: Polyimide (PI) 10%, high-ortho-phenolic resin 25%, silicon carbide (SiC) 8%, boron nitride (BN) 12%, nano-alumina (Al2O3) 10%, polyether sulfone 8%, diisocyanate 3%, styrene-maleic anhydride copolymer 9%, N-methylpyrrolidone 5%, silane coupling agent 1%.

[0029] The preparation method is the same as that in Example 1.

[0030] Example 4

[0031] Ratio (control group): polyethylene terephthalate (PET) 20%, epoxy resin 25%, talcum powder 15%, phthalate plasticizer 5%, xylene solvent 35%.

[0032] The preparation method is the same as that in Example 1.

[0033]

[0034] The heat resistance, mechanical strength and adhesion of Examples 1-3 are significantly better than those of the control group, verifying the effectiveness of the polyimide-based composite coating and the gradient curing process.

[0035] The uniform dispersion of nanofillers (BN, Al2O3, SiC) is the key to improving the uniformity of the coating.

[0036] High temperature resistance test:

[0037] Electrical performance test:

[0038] Mechanical properties test (ASTM D638 standard):

[0039] Adhesion and coating uniformity testing:

[0040] Process parameter verification experiment

[0041] Long-term stability and environmental testing

[0042] Comparative experiment summary: Filler dispersion: The ultrasonic plus high-speed shearing process of Example 1 makes the fillers (SiC, BN, Al2O3) dispersed evenly (D50=0.8μm), while the control group did not use a coupling agent, resulting in filler agglomeration (D50=5μm).

[0043] Improved heat resistance: The synergistic effect of polyimide and nanofillers enables long-term temperature resistance to reach 250°C, which is 40% higher than the control group (180°C).

[0044] Mechanical strength: The tensile strength of Example 1 is 220 MPa, which is 83% higher than that of the control group (120 MPa).

[0045] Environmental protection: The solvent usage in Example 1 is reduced by 50%, and VOC emissions are lower than international standards.

[0046] Example 5

[0047] The embodiment of the present invention provides a manufacturing device for a modified polyester enameled braided flat wire.

[0048] Please refer to Figure 2 , Figure 2 The present invention provides a structural schematic diagram of a manufacturing device for a modified polyester enameled braided flat wire, wherein the manufacturing device for the modified polyester enameled braided flat wire may include: Memory for storing computer programs; The processor is used to implement the steps of any one of the above-mentioned intelligent photovoltaic energy storage methods when executing a computer program.

[0049] like Figure 2 As shown, it is a schematic diagram of the composition structure of the manufacturing equipment of the modified polyester enameled braided flat wire, and the manufacturing equipment of the modified polyester enameled braided flat wire may include: a processor 60, a memory 61, a communication interface 62 and a communication bus 63. The processor 60, the memory 61, and the communication interface 62 all communicate with each other through the communication bus 63.

[0050] In the embodiment of the present invention, the processor 60 may be a central processing unit (CPU), an application specific integrated circuit, a digital signal processor, a field programmable gate array or other programmable logic devices.

[0051] The processor 60 may call a program stored in the memory 61 . Specifically, the processor 60 may execute the operations in the embodiment of the push button switch fault detection method.

[0052] The memory 61 is used to store one or more programs, which may include program codes, and the program codes include computer operation instructions. In the embodiment of the present invention, the memory 61 at least stores programs for implementing the following functions: The energy storage monitoring unit obtains the operating parameters of the battery pack in the energy storage unit, presets a first standard, and when the energy storage unit reaches the first standard, the energy storage monitoring unit sends a second control signal to the switch unit; The power supply status and the load status of the power supply unit are obtained through the power generation monitoring unit, and a second standard is preset. When the power supply unit reaches the second standard, the power generation monitoring unit sends a first control signal to the switch unit; After the switch unit obtains the first control signal and the second control signal, it closes the switch to charge and store energy in the battery pack. When the switch unit obtains the second control signal but not the first control signal, the battery pack drives the photovoltaic energy storage component through the battery management module to charge and store energy in the battery pack.

[0053] In a possible implementation, the memory 61 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function, etc.; the data storage area may store data created during use.

[0054] In addition, the memory 61 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device or other volatile solid-state storage device.

[0055] The communication interface 62 may be an interface of a communication module, and is used to connect to other devices or systems.

[0056] Of course, it should be noted that Figure 2 The structure shown does not constitute a limitation on the manufacturing equipment of the modified polyester enameled braided flat wire in the embodiment of the present invention. In practical applications, the manufacturing equipment of the modified polyester enameled braided flat wire may include Figure 2 More or fewer components than shown, or combinations of certain components.

[0057] The present invention is suitable for scenarios such as new energy vehicle motors and high-temperature transformers, and can replace imported high-end enameled wires.

[0058] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. A method for preparing a modified polyester enameled braided flat wire, characterized in that: The modified polyester enameled braided flat wire comprises: Braided flat wire body and polyester sheath; The formula ratio of the polyester wrapping layer includes: Polyimide 10-15%, high ortho-phenolic resin 18-25%, silicon carbide 8-15%, boron nitride 5-12%, nano-alumina 10-15%, polyether sulfone 6-8%, diisocyanate 3-4%, styrene-maleic anhydride copolymer 8-10%, solvent 3-5%, silane coupling agent 1-2%, The preparation process of the polyester wrapping layer comprises the following steps: S100, mixing silicon carbide, boron nitride, nano-aluminum oxide and a silane coupling agent, adding 50% of the total amount of solvent, performing ultrasonic dispersion and high-speed shearing to form a uniform slurry; S200, add polyimide, high-ortho-phenolic resin and polyethersulfone to the remaining solvent, and stir in 60°C constant temperature water until completely dissolved; S300, mixing the resin solution and the filler slurry, adding styrene-maleic anhydride copolymer, controlling the temperature at 80° C. and continuously stirring, adding diisocyanate, and stirring until the viscosity of the system is stable to obtain a mixed paint solution; S400, soak the copper wire in 10% dilute sulfuric acid solution to remove the surface oxide layer, dry in an oven for 10 minutes, and evenly apply the mixed paint solution to the surface of the flat wire body by dip coating, with a coating thickness of 10~15μm, preheat at 80℃ for 5 minutes, initially evaporate the solvent, and use electrostatic spraying for secondary coating, with a thickness of 5~8μm, and the voltage is set to 50kV to ensure a smooth surface; S500, using multi-stage gradient curing to cure the modified polyester enameled braided flat wire processed in step S400, and using segmented cooling to prevent thermal stress cracking of the modified polyester enameled braided flat wire.

2. The method for preparing the modified polyester enameled braided flat wire according to claim 1, characterized in that: The solvent is N-methylpyrrolidone.

3. The method for preparing the modified polyester enameled braided flat wire according to claim 2, characterized in that: In step S100, ultrasonic dispersion is performed at 40 kHz for 30 minutes, and high-speed shearing is performed at 5000 rpm for 20 minutes to form a uniform slurry; In step S200, the dissolution time is 1 to 2 hours.

4. The method for preparing the modified polyester enameled braided flat wire according to claim 3, characterized in that: In step S300, when styrene-maleic anhydride copolymer is added, the stirring speed is 300 rpm and the stirring is continued for 30 minutes. When diisocyanate is added, the stirring speed is 500 rpm and the stirring is continued for 10 minutes. When the viscosity of the system is 2000-3000 mPa·s, it is sufficient.

5. The method for preparing the modified polyester enameled braided flat wire according to claim 4, characterized in that: In step S400, the soaking time is 5 minutes, the drying time is 10 minutes, and when the mixed paint liquid is applied, the coating line speed is 10-15 m / min.

6. The method for preparing modified polyester enameled braided flat wire according to claim 5, characterized in that: In step S500, the multi-stage curing includes: The first stage, 180℃ / 20 minutes, promotes the initial cross-linking of the resin; The second stage, 220℃ / 30min, enhances cross-linking density and filler bonding; The third stage, 250℃ / 15 minutes, forms a dense heat-resistant coating; Staged cooling includes: The first stage, 250℃-100℃, cooling rate ≤5℃ / min; In the second stage, forced air cooling is performed to room temperature.

7. A manufacturing device for modified polyester enameled braided flat wire, characterized in that: The invention comprises a manufacturing equipment body of modified polyester enameled braided flat wire and a controller, wherein the controller comprises a processor and a computer program stored in a memory and executable on the processor, and when the processor executes the program, the steps of the method for preparing modified polyester enameled braided flat wire according to any one of claims 1 to 6 are implemented.

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