Mica tape precision-lapped magnet wire and manufacturing method therefor

Abstract

A mica tape precision-lapped magnet wire and a manufacturing method therefor, belonging to the technical field of lapped magnet wires. By adding dolomite having a low price and uniform particle size, the insulation performance of an insulating coating and the stability of the coating in high-temperature environment are remarkably improved. The addition of selenium disulfide further improves the insulation performance and stability of the coating, and simultaneously, due to the moisture-proof property of selenium disulfide, the resistance of the insulating coating to corrosion by moisture, chemicals, etc., is also enhanced. The addition of citric acid reduces the aging speed of the coating, and the citric acid can improve the bonding strength between the coating and a substrate and improve the adhesion and stability of the coating, thereby enhancing the durability of the coating. By adding palm wax, the flowability and coverage of the coating are improved, so that the manufactured insulating coating can be better attached to the surface of a mica tape.

Description

Mica tape precision enameled magnet wire and preparation method thereof TECHNICAL FIELD

[0001] The present application belongs to the technical field of enameled magnet wire, and relates to a mica tape precision enameled magnet wire and a preparation method thereof. BACKGROUND

[0002] High-voltage motors refer to motors with a rated voltage of 1000V or above. Commonly used are 6000V and 10000V voltages. High-voltage motors are produced because the power of a motor is proportional to the product of voltage and current, so when the power of a low-voltage motor increases to a certain extent, the current is limited by the allowable bearing capacity of the conductor, making it difficult to increase the power or the cost is too high, and high-voltage is needed to achieve high-power output. The advantages of high-voltage motors are high power and strong impact resistance; the disadvantages are large inertia and difficulty in starting and braking.

[0003] Magnet wires are mainly used in the windings of transformers, motors and various electrical equipment, and are the key materials for completing electromagnetic energy conversion. With the continuous development of electrical equipment, the performance requirements for magnet wires are also becoming higher and higher, especially in terms of insulation performance, mechanical strength, heat dissipation capacity, etc. Although the traditional magnet wire manufacturing method can meet the basic use requirements, its performance may be affected in some special environments, such as high temperature, high humidity, high voltage, etc.

[0004] Mica tape, as a material with excellent insulation performance and high-temperature resistance, is widely used in the production of magnet wires. The mica tape enameled magnet wire technology is to wrap a layer of mica tape around the conductor to form a strong insulation layer, thereby improving the insulation performance and high-temperature resistance of the magnet wire. This technology not only improves the service life of the magnet wire, but also improves the operation stability of the electrical equipment.

[0005] As one of the indispensable important accessories inside high-voltage motors, enameled magnet wires need to be insulated on the surface to meet the extreme environment during operation of high-voltage motors. The insulation treatment part is used to separate the contact between the conductors, and the main purpose is also to reduce the harm caused by the generation of corona. The present application improves the performance of the mica tape enameled magnet wire by further insulating the surface of the mica tape. SUMMARY

[0006] The present application aims to provide a mica tape precision enameled magnet wire and a preparation method thereof, which has good insulation performance and long service life.

[0007] The object of the present application can be achieved by the following technical solutions:

[0008] A mica tape precision wrapping electromagnetic wire, the wrapping electromagnetic wire comprises an internal metal conductor and a mica tape with a surface-attached modified insulation coating, wherein the mica tape with a surface-attached modified insulation coating is prepared by the following method,

[0009] S1: 20-25% polyurethane resin, 15-20% epoxy resin, 10-15% phenolic resin, 25-30% dolomite, 3-5% silicon dioxide, 1-3% palm wax, 1-3% citric acid, 1-3% selenium disulfide, 1-3% rare earth elements, 1-2% dispersant, 1-2% curing agent, first mix the polyurethane resin, epoxy resin and phenolic resin in proportion, heat to 180℃ after uniform mixing, make the mixture in molten state, stir at 300r / min for 2h, get mixture A;

[0010] S2: mix dolomite and silicon dioxide in proportion, grind in a ball mill at 400r / min for 4h, get mixture B;

[0011] S3: add mixture B to mixture A, continue to stir at 300r / min for 2h at 180℃, cool to 120℃, then add palm wax, citric acid, selenium disulfide, rare earth elements, dispersant and curing agent in proportion, stir for 2h, then slowly cool to room temperature, stand for 12h to get the modified insulation coating;

[0012] S4: dry the mica tape at 80℃ for 12h, lay the completely dried mica tape and soak in the modified insulation coating prepared in S3 for 1h, then take out and lay;

[0013] S5: dry the soaked mica tape by laser irradiation, the laser power of laser irradiation is 300W, the temperature is 50℃, the irradiation time is 1h, stand for 12h after drying, get the mica tape with surface-attached modified insulation coating.

[0014] Further, the metal conductor is one of copper, aluminum and silver.

[0015] Further, the rare earth element in S1 is one or more of La, Ce and Pr.

[0016] Further, the dispersant in S1 is polyethylene glycol with a molecular weight of 800-1000.

[0017] Further, the curing agent in S1 is one of diisocyanate and triisocyanate.

[0018] A preparation method of a mica tape precision wrapping electromagnetic wire, the mica tape precision wrapping electromagnetic wire preparation method process is as follows,

[0019] S61: processing the metal conductor by rolling and drawing method, drawing to 0.1mm in diameter of the metal conductor;

[0020] S62: coating a layer of adhesive on the surface of the conductor by spraying method;

[0021] S63: winding the mica tape with surface attached modified insulation coating on the conductor, drying at 80℃ for 12h under nitrogen atmosphere, to obtain the mica tape precision wrapped electromagnetic wire.

[0022] Further, the parameters of the spraying method in S62 are spraying distance 100-150mm and spraying speed 60-120mm / s.

[0023] Further, the wrapping gap of the mica tape in S63 ranges from 0.1 to 0.3mm.

[0024] Dolomite, as an inorganic mineral material, has good insulation performance. Adding it to the insulation coating can significantly improve the insulation resistance of the coating; dolomite has excellent high-temperature resistance. Adding dolomite to the insulation coating can significantly improve the stability of the coating in high-temperature environment and prevent the performance of the coating from declining or failing due to high temperature; the addition of dolomite can enhance the hardness and wear resistance of the insulation coating, making it more durable; dolomite has good dispersibility in the coating and can tightly combine with other components in the coating, thereby improving the adhesion between the coating and the substrate and reducing the risk of coating peeling or cracking; in addition, dolomite has the advantages of low price and environmental protection.

[0025] However, the particle size and distribution of dolomite are crucial to the uniformity and consistency of the insulation coating. If the particles are too large or unevenly distributed, it may cause the surface of the coating to be uneven, even with holes or cracks, thereby affecting the insulation performance and service life of the coating. Therefore, the ball mill is used to grind dolomite in the present application to obtain dolomite particles with uniform particle size.

[0026] The present application also adds selenium disulfide to further improve the insulation performance of the insulation coating. Selenium disulfide has good electrical insulation performance, which can improve the overall insulation strength of the insulation layer, effectively prevent current leakage and ensure the safe and stable operation of the circuit; selenium disulfide also has excellent heat resistance, and the addition of selenium disulfide can significantly improve the high-temperature resistance of the insulation layer, so that it can maintain stable performance under extreme conditions; selenium disulfide also has certain moisture resistance, which can enhance the resistance of the insulation layer to the erosion of moisture, chemicals and other substances, thereby prolonging the service life of the insulation layer.

[0027] The stability of the insulation layer is improved by adding palm wax in the present application, and the waterproof, moisturizing and thickening capacity of the coating can be improved by adding palm wax in the insulation coating. This helps to enhance the durability of the coating, and the thickening effect of palm wax can also improve the flowability and coverage of the coating, so that the prepared insulation coating can be better attached to the surface of the mica tape.

[0028] Citric acid has excellent antioxidant properties and can effectively prevent the deterioration of materials in the coating due to oxidation. The addition of citric acid in the insulation coating helps to slow down the aging rate of the coating, thereby enhancing its durability; citric acid also has certain antibacterial and antifungal properties, which can reduce the erosion of microorganisms to the coating, further prolonging the service life of the coating; citric acid can also improve the bonding force between the coating and the substrate, improve the adhesion and stability of the coating, which is also an important factor to improve the durability of the coating.

[0029] The beneficial effects of the present application are:

[0030] The present application significantly improves the insulation performance of the insulation coating and the stability of the coating in a high temperature environment by adding dolomite with low price and uniform particle size; the present application further improves the insulation performance and stability of the coating by adding selenium disulfide, and the moisture resistance of selenium disulfide also enhances the resistance of the insulation layer to moisture, chemicals and other erosions; the present application slows down the aging rate of the coating by adding citric acid, which can improve the bonding force between the coating and the substrate, improve the adhesion and stability of the coating, thereby enhancing the durability of the coating; the present application improves the flowability and coverage of the coating by adding palm wax, so that the prepared insulation coating can be better attached to the surface of the mica tape. DETAILED DESCRIPTION

[0031] To further illustrate the technical means and effects adopted by the present application to achieve the predetermined invention purposes, the specific embodiments, structures, features and effects according to the present application are described in detail as follows.

[0032] The ratio of the modified insulation coating is as follows,

[0033] Ratio 1: polyurethane resin 20%, epoxy resin 20%, phenolic resin 10%, dolomite 30%, silicon dioxide 5%, palm wax 3%, citric acid 3%, selenium disulfide 3%, rare earth element La 3%, dispersant PEG-1000 2%, diisocyanate 1%;

[0034] Ratio 2: polyurethane resin 25%, epoxy resin 15%, phenolic resin 15%, dolomite 25%, silicon dioxide 5%, palm wax 3%, citric acid 3%, selenium disulfide 3%, rare earth element La 3%, dispersant PEG-1000 2%, diisocyanate 1%;

[0035] Ratio 3: polyurethane resin 25%, epoxy resin 20%, phenolic resin 10%, dolomite 30%, silicon dioxide 3%, palm wax 3%, citric acid 3%, selenium disulfide 1%, rare earth element La 3%, dispersant PEG-1000 1%, diisocyanate 1%;

[0036] Ratio 4: polyurethane resin 20%, epoxy resin 20%, phenolic resin 15%, dolomite 30%, silicon dioxide 5%, palm wax 1%, citric acid 1%, selenium disulfide 3%, rare earth element La 1%, dispersant PEG-1000 2%, diisocyanate 2%;

[0037] Ratio 5: polyurethane resin 20%, epoxy resin 20%, phenolic resin 15%, dolomite 30%, silicon dioxide 5%, palm wax 3%, citric acid 3%, selenium disulfide 1%, rare earth element La 1%, dispersant PEG-1000 1%, diisocyanate 1%;

[0038] Comparative ratio 1: polyurethane resin 20%, epoxy resin 20%, phenolic resin 10%, dolomite 30%, silicon dioxide 5%, rare earth element La 3%, dispersant PEG-1000 2%, diisocyanate 1%, deionized water 9%;

[0039] Comparative ratio 2: polyurethane resin 20%, epoxy resin 20%, phenolic resin 10%, dolomite 30%, silicon dioxide 5%, citric acid 3%, selenium disulfide 3%, rare earth element La 3%, dispersant PEG-1000 2%, diisocyanate 1%, deionized water 3%;

[0040] Comparative ratio 3: polyurethane resin 20%, epoxy resin 20%, phenolic resin 10%, dolomite 30%, silicon dioxide 5%, palm wax 3%, selenium disulfide 3%, rare earth element La 3%, dispersant PEG-1000 2%, diisocyanate 1%, deionized water 3%;

[0041] Comparative ratio 4: polyurethane resin 20%, epoxy resin 20%, phenolic resin 10%, dolomite 30%, silicon dioxide 5%, palm wax 3%, citric acid 3%, rare earth element La 3%, dispersant PEG-1000 2%, diisocyanate 1%, deionized water 3%;

[0042] The preparation method of the mica tape with surface-attached modified insulation coating is as follows,

[0043] S1: First, mix the polyurethane resin, epoxy resin and phenolic resin according to the proportion, heat to 180℃ after uniform mixing, so that the mixture is in a molten state, stir at a speed of 300r / min, the stirring time is 2h, get mixture A;

[0044] S2: proportionally mix dolomite and silicon dioxide, and grind in a ball mill at a rotating speed of 400 r / min for 4 h to obtain a mixture B;

[0045] S3: add the mixture B into the mixture A, and continue to stir at a rotating speed of 300 r / min at 180℃ for 2 h, cool to 120℃, and then proportionally add palm wax, citric acid, selenium disulfide, rare earth element La, PEG-1000, diisocyanate, stir for 2 h, and then slowly cool to room temperature, and stand for 12 h to obtain a modified insulating coating;

[0046] S4: dry the mica tape at 80℃ for 12 h, and then lay and soak the completely dried mica tape in the modified insulating coating prepared in S3 for 1 h, and then take out the laid mica tape after soaking;

[0047] S5: dry the soaked mica tape by laser irradiation, the laser power of the laser irradiation is 300 W, the temperature is 50℃, the irradiation time is 1 h, and the mica tape with the modified insulating coating attached to the surface is obtained after standing for 12 h.

[0048] Example 1

[0049] The preparation method of the mica tape precision wrapped electromagnetic wire is as follows,

[0050] S61: process the metal conductor by a rolling and drawing method, and draw the metal conductor to a diameter of 0.1 mm;

[0051] S62: coat a layer of adhesive on the surface of the conductor by spraying, the spraying distance is 130 mm, and the spraying rate is 100 mm / s;

[0052] S63: wrap the mica tape with the modified insulating coating attached to the surface in proportion to ratio 1 on the conductor, dry at 80℃ for 12 h in a nitrogen atmosphere, and obtain the mica tape precision wrapped electromagnetic wire.

[0053] Example 2 differs from Example 1 in that the mica tape with the modified insulating coating attached to the surface in proportion to ratio 2 is used in S63, and the remaining steps are the same.

[0054] Example 3 differs from Example 1 in that the mica tape with the modified insulating coating attached to the surface in proportion to ratio 3 is used in S63, and the remaining steps are the same.

[0055] Example 4 differs from Example 1 in that the mica tape with the modified insulating coating attached to the surface in proportion to ratio 4 is used in S63, and the remaining steps are the same.

[0056] Example 5 differs from Example 1 in that the mica tape used in S63 is attached with a modified insulating coating of ratio 5, and the remaining steps are the same.

[0057] Comparative Example 1 differs from Example 1 in that the mica tape used in S63 is attached with a modified insulating coating of Comparative Example 1, and the remaining steps are the same.

[0058] Comparative Example 2 differs from Example 1 in that the mica tape used in S63 is attached with a modified insulating coating of Comparative Example 2, and the remaining steps are the same.

[0059] Comparative Example 3 differs from Example 1 in that the mica tape used in S63 is attached with a modified insulating coating of Comparative Example 3, and the remaining steps are the same.

[0060] Comparative Example 4 differs from Example 1 in that the mica tape used in S63 is attached with a modified insulating coating of Comparative Example 4, and the remaining steps are the same.

[0061] The mica tapes prepared in the examples and comparative examples of the present application were subjected to insulation detection of precision-wound magnet wires, and the conductivity of the test samples was tested according to GB / T 17650.2-2021, the lower the conductivity, the better the insulation, and the experimental data is as follows.

[0062] Conductivity of the insulating layer attached to the mica tape (μS / mm) Example 1 ratio 4 2.5 Example 2 ratio 4 5.0 Example 3 ratio 5 2.5 Example 4 ratio 5 5.0 Example 5 ratio 5 5.3 Comparative Example 1 Comparative Example 1 14.3 Comparative Example 2 Comparative Example 2 11.1 Comparative Example 3 Comparative Example 3 10.2 Comparative Example 4 Comparative Example 4 12.7

[0063] Through experiments, the mica tape prepared in Example 1 has the best performance.

[0064] When the present application is used:

[0065] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any equivalent embodiments with equivalent changes and modifications are still within the scope of the technical solution of the present application.

Claims

1. A mica tape precision enameled magnet wire, characterized by, The wrapping electromagnetic wire comprises an internal metal conductor and a mica tape with a surface-attached modified insulation coating, wherein a preparation method of the mica tape with the surface-attached modified insulation coating comprises the following steps, S1: 20-25% of polyurethane resin, 15-20% of epoxy resin, 10-15% of phenolic resin, 25-30% of dolomite, 3-5% of silicon dioxide, 1-3% of palm wax, 1-3% of citric acid, 1-3% of selenium disulfide, 1-3% of rare earth elements, 1-2% of dispersant, and 1-2% of curing agent are mixed in proportion, and then uniformly mixed and heated to 180 DEG C to make the mixture in a molten state, and stirred at a speed of 300 r / min for 2 h to obtain a mixture A; S2: the dolomite and the silicon dioxide are mixed in proportion, and then ground in a ball mill at a speed of 400 r / min for 4 h to obtain a mixture B; S3: the mixture B is added to the mixture A, and then continuously stirred at a speed of 300 r / min at 180 DEG C for 2 h, cooled to 120 DEG C, and then the palm wax, the citric acid, the selenium disulfide, the rare earth elements, the dispersant, and the curing agent are added in proportion, stirred for 2 h, and then slowly cooled to room temperature, and then statically placed for 12 h to obtain the modified insulation coating; S4: the mica tape is dried at 80 DEG C for 12 h, and then laid and soaked in the modified insulation coating obtained in S3 for 1 h, and then taken out and laid; S5: the soaked mica tape is dried by laser irradiation, the laser power of the laser irradiation is 300 W, the temperature is 50 DEG C, the irradiation time is 1 h, and then the mica tape with the surface-attached modified insulation coating is obtained after being statically placed for 12 h.

2. The mica tape precision wrapped magnet wire of claim 1, wherein, The metal conductor is one of copper, aluminum and silver.

3. The mica tape precision wrapped magnet wire of claim 1, wherein, The rare earth element in S1 is one or more of La, Ce and Pr.

4. The mica tape precision wrapped magnet wire of claim 1, wherein, The dispersant in S1 is polyethylene glycol with a molecular weight of 800-1000.

5. The mica tape precision wrapped magnet wire of claim 1, wherein, The curing agent in S1 is one of diisocyanate and triisocyanate.

6. A method for manufacturing a mica tape precision enameled magnet wire, based on the realization of a mica tape precision enameled magnet wire according to any one of claims 1-5, characterized in that, A preparation method of the mica tape precision wrapping electromagnetic wire comprises the following steps, S61: the metal conductor is processed by a rolling and drawing method, and drawn to a diameter of 0.1 mm; S62: a layer of adhesive is coated on the surface of the conductor by a spraying method; S63: the mica tape with the surface-attached modified insulation coating is wrapped on the conductor, dried at 80 DEG C for 12 h in a nitrogen atmosphere, and then the mica tape precision wrapping electromagnetic wire is obtained.

7. A method of manufacturing a mica tape precision wrapped electromagnetic wire according to claim 6, characterized in that, The parameters of the spraying method in S62 are a spraying distance of 100-150 mm and a spraying rate of 60-120 mm / s.

8. The method for preparing a mica tape precision-wrapped electromagnetic wire according to claim 6, characterized in that, The wrapping gap range of the mica tape in S63 is 0.1-0.3 mm.