Insulated submersible motor winding wire and preparation method thereof

Abstract

The invention relates to the technical field of winding wires, and proposes an insulated submersible motor winding wire and a preparation method thereof. The insulated submersible motor winding wire includes a wire core, a film layer, and an insulating layer from the inside to the outside. The wire core is composed of a conductor and a coating. The conductor is a copper wire, the coating is a nickel coating, the film layer is a polyester film, and the insulating layer includes the following raw materials by weight: 60-70 parts of polyethylene, 20-30 parts of filler, 1-3 parts of silane coupling agent, 1-2 parts of lubricant, and 2-3 parts of antioxidant; the filler includes bentonite and modified alumina, and the modified alumina is obtained by modifying alumina with nitride. Through the above technical scheme, the problem of poor mechanical properties and insulation of the winding wire in the related art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of winding wires, and in particular to an insulating submersible motor winding wire and a preparation method thereof. Background Art

[0002] Winding wire is an indispensable key material in electrical products such as motors and electrical appliances, and plays an extremely important role in the operation of electrical equipment. With the continuous development of the power industry, from the early simple power transmission and distribution to the current complex and diverse industrial automation, new energy power generation, electric vehicles and many other fields, the requirements for the performance of electrical equipment are increasing. As the basic component of the winding of equipment such as motors and transformers, the technology of winding wire has also undergone a long evolution. In the early days, winding wire was mainly based on simple copper or aluminum wires, with relatively simple structures and performance. As electrical equipment develops towards miniaturization, lightness, high efficiency and high reliability, winding wire faces many challenges and opportunities. On the one hand, in order to meet the needs of equipment miniaturization, the wire diameter of the winding wire is constantly reduced, but at the same time, sufficient conductivity must be guaranteed to reduce energy loss; on the other hand, more and more electrical equipment is operating under harsh working conditions such as high voltage and high humidity, which requires the winding wire to have good mechanical properties and insulation properties to ensure stable and reliable operation of the equipment under complex conditions. Summary of the invention

[0003] The invention provides an insulating submersible motor winding wire and a preparation method thereof, which solves the problem of poor mechanical properties and insulation of the winding wire in the related art.

[0004] The technical solution of the present invention is as follows:

[0005] The present invention provides an insulated submersible motor winding wire, which comprises a wire core, a film layer and an insulating layer from the inside to the outside, wherein the wire core consists of a conductor and a coating, the conductor is a copper wire, the coating is a nickel coating, the film layer is a polyester film, and the insulating layer comprises the following raw materials in parts by weight: 60-70 parts of polyethylene, 20-30 parts of filler, 1-3 parts of silane coupling agent, 1-2 parts of lubricant, and 2-3 parts of antioxidant; the filler comprises bentonite and modified alumina; the modified alumina is obtained by modifying alumina with nitride.

[0006] As a further technical solution, the mass ratio of the bentonite to the modified alumina is 2:1-3.

[0007] In the present invention, the mass ratio of bentonite to modified alumina is limited to 2:1-3, thereby further improving the mechanical properties and insulation of the winding wire.

[0008] As a further technical solution, the mass ratio of the bentonite to the modified alumina is 1:1.

[0009] In the present invention, the mass ratio of bentonite to modified alumina is limited to 1:1, thereby further improving the mechanical properties and insulation of the winding wire.

[0010] As a further technical solution, the raw materials of the modified alumina include nitride, alumina, and magnesium citrate.

[0011] As a further technical solution, the mass ratio of the nitride to alumina is 1-3:3, and the added amount of the magnesium citrate is 5%-6% of the total mass of the nitride and alumina.

[0012] In the present invention, the mass ratio of nitride to aluminum oxide is limited to 1-3:3, thereby further improving the mechanical properties and insulation of the winding wire.

[0013] As a further technical solution, the particle size of the nitride is 20-50 nm, and the particle size of the aluminum oxide is 325-500 mesh.

[0014] As a further technical solution, the nitride includes one or both of silicon nitride and aluminum nitride.

[0015] As a further technical solution, the preparation method of the modified alumina comprises the following steps: dissolving magnesium citrate in a solvent, adding nitride and alumina to mix, and obtaining the modified alumina after drying and roasting.

[0016] As a further technical solution, the solvent is deionized water.

[0017] As a further technical solution, the calcination temperature is 400-500° C., and the calcination time is 2-4 hours.

[0018] As a further technical solution, the silane coupling agent includes one or more of silane coupling agent KH-550, silane coupling agent KH-570, and silane coupling agent KH-560.

[0019] As a further technical solution, the lubricant includes one or more of stearic acid, paraffin, and erucamide.

[0020] As a further technical solution, the antioxidant includes one or more of antioxidant 168, antioxidant 1076, and antioxidant 225.

[0021] As a further technical solution, the thickness of the film layer is 0.1-0.2 mm.

[0022] As a further technical solution, the thickness of the insulating layer is 0.7~1mm.

[0023] The present invention also provides a method for preparing an insulated submersible motor winding wire, comprising the following steps:

[0024] S1, coating the outer side of the copper wire with a nickel plating layer to obtain a wire core;

[0025] S2, wrapping a polyester film around the outer side of the wire core to obtain a film layer, forming a semi-finished winding wire;

[0026] S3. After mixing the raw materials for the insulating layer, the raw materials are extruded and wrapped on the outer side of the semi-finished winding wire to obtain the insulated submersible motor winding wire.

[0027] The working principle and beneficial effects of the present invention are:

[0028] In the present invention, the winding wire consists of a wire core, a film layer and an insulating layer, wherein a nickel-plated layer is coated on the outer side of a copper wire to obtain a wire core, thereby improving the insulation of the wire core, using a polyester film as the film layer to improve the insulation of the winding wire, using polyethylene as the base material of the winding wire insulating layer, and adding a filler consisting of bentonite and alumina modified by nitride, thereby improving the mechanical properties and insulation of the winding wire insulating layer, thereby solving the problem of poor mechanical properties and insulation of the winding wire. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the following embodiments and comparative examples:

[0031] Polyethylene, model: LDPE N220; bentonite, particle size: 200 mesh; silicon nitride, particle size: 50nm; aluminum nitride, particle size: 50nm; aluminum oxide, particle size: 500 mesh.

[0032] Example 1

[0033] A method for preparing an insulated submersible motor winding wire comprises the following steps:

[0034] S1, coating the outer side of the copper wire with a nickel plating layer to obtain a wire core;

[0035] S2, wrapping a polyester film around the outer side of the wire core to form a film layer with a thickness of 0.1 mm to obtain a semi-finished winding wire;

[0036] S3, after mixing 60 parts of polyethylene, 20 parts of filler, 1 part of silane coupling agent KH-550, 1 part of stearic acid, and 2 parts of antioxidant 168, extrude and wrap the mixture on the outside of the semi-finished winding wire to form an insulating layer with a thickness of 0.7 mm, and obtain an insulated submersible motor winding wire;

[0037] The filler is obtained by mixing bentonite and silicon nitride modified alumina in a mass ratio of 4:1;

[0038] The preparation method of silicon nitride modified alumina comprises the following steps: dissolving 2.52 g of magnesium citrate in 300 mL of deionized water, adding 7.2 g of silicon nitride and 43.2 g of alumina to mix, and obtaining silicon nitride modified alumina after drying.

[0039] Example 2

[0040] A method for preparing an insulated submersible motor winding wire comprises the following steps:

[0041] S1, coating the outer side of the copper wire with a nickel plating layer to obtain a wire core;

[0042] S2, wrapping a polyester film around the outer side of the wire core to form a film layer with a thickness of 0.15 mm to obtain a semi-finished winding wire;

[0043] S3, after mixing 65 parts of polyethylene, 25 parts of filler, 2 parts of silane coupling agent KH-560, 1 part of paraffin wax, and 2 parts of antioxidant 1076, extrude and wrap the mixture on the outside of the semi-finished winding wire to form an insulating layer with a thickness of 0.8 mm, and obtain an insulated submersible motor winding wire;

[0044] The filler is obtained by mixing bentonite and silicon nitride modified alumina in a mass ratio of 4:1;

[0045] The preparation method of silicon nitride modified alumina comprises the following steps: dissolving 2.52 g of magnesium citrate in 300 mL of deionized water, adding 7.2 g of silicon nitride and 43.2 g of alumina to mix, and obtaining silicon nitride modified alumina after drying.

[0046] Example 3

[0047] A method for preparing an insulated submersible motor winding wire comprises the following steps:

[0048] S1, coating the outer side of the copper wire with a nickel plating layer to obtain a wire core;

[0049] S2, wrapping a polyester film around the outer side of the wire core to form a film layer with a thickness of 0.2 mm to obtain a semi-finished winding wire;

[0050] S3, after mixing 70 parts of polyethylene, 30 parts of filler, 3 parts of silane coupling agent KH-570, 2 parts of erucic acid amide, and 3 parts of antioxidant 225, extrude and wrap them on the outside of the semi-finished winding wire to form an insulating layer with a thickness of 1 mm, and obtain an insulated submersible motor winding wire;

[0051] The filler is obtained by mixing bentonite and aluminum nitride modified alumina in a mass ratio of 4:1;

[0052] The preparation method of aluminum nitride modified aluminum oxide comprises the following steps: dissolving 3.02 g of magnesium citrate in 300 mL of deionized water, adding 7.2 g of aluminum nitride and 43.2 g of aluminum oxide to mix, and obtaining aluminum nitride modified aluminum oxide after drying.

[0053] Example 4

[0054] The only difference between this embodiment and embodiment 1 is that the filler is obtained by mixing bentonite and silicon nitride modified alumina in a mass ratio of 1:4.

[0055] Example 5

[0056] The only difference between this embodiment and embodiment 4 is that the mass ratio of bentonite to silicon nitride modified alumina is 2:1.

[0057] Example 6

[0058] The only difference between this embodiment and embodiment 4 is that the mass ratio of bentonite to silicon nitride modified alumina is 1:1.

[0059] Example 7

[0060] The only difference between this embodiment and embodiment 4 is that the mass ratio of bentonite to silicon nitride modified alumina is 2:3.

[0061] Example 8

[0062] The only difference between this embodiment and embodiment 6 is that the preparation method of silicon nitride modified alumina includes the following steps: dissolving 2.52 g of magnesium citrate in 300 mL of deionized water, adding 7.2 g of silicon nitride and 43.2 g of alumina to mix, drying, and calcining at 400° C. for 3 h to obtain silicon nitride modified alumina.

[0063] Example 9

[0064] The only difference between this embodiment and Embodiment 8 is that the addition amount of silicon nitride is 33.6 g and the addition amount of aluminum oxide is 16.8 g.

[0065] Example 10

[0066] The only difference between this embodiment and Embodiment 8 is that the addition amount of silicon nitride is 12.6 g and the addition amount of aluminum oxide is 37.8 g.

[0067] Embodiment 11

[0068] The only difference between this embodiment and Embodiment 8 is that the addition amount of silicon nitride is 25.2 g and the addition amount of aluminum oxide is 25.2 g.

[0069] Comparative Example 1

[0070] The only difference between this comparative example and Example 1 is that the filler is bentonite.

[0071] Comparative Example 2

[0072] The only difference between this comparative example and Example 1 is that the filler is silicon nitride modified alumina.

[0073] Comparative Example 3

[0074] The only difference between this comparative example and Example 1 is that the silicon nitride modified aluminum oxide is replaced by an equal amount of aluminum oxide.

[0075] The raw materials for the insulating layers in Examples 1 to 11 and Comparative Examples 1 to 3 were mixed and extruded into sheets according to their respective molding processes, with a thickness of 0.7 mm, and cut into Type 1A specimens in GB / T 1040.2-2022. The tensile strength was tested according to the method in GB / T 1040.1-2018 "Determination of Tensile Properties of Plastics Part 1: General Principles", with a test speed of 1 mm / min;

[0076] The breakdown voltage of the winding wires prepared in Examples 1 to 11 and Comparative Examples 1 to 3 was tested at room temperature according to method 4.5 of test method 13 in GB / T 4074.5-2004 "Winding Wire Test Methods Part 5: Electrical Properties". The test results are shown in Table 1.

[0077] Table 1 Winding wire performance test results

[0078]

[0079] Compared with Comparative Examples 1 to 3, the tensile strength of the insulating layer and the breakdown voltage of the winding wire prepared in Example 1 are higher than those of Comparative Examples 1 to 3, indicating that when the filler is composed of bentonite and modified alumina, the mechanical properties and insulation properties of the winding wire can be improved.

[0080] Compared with Example 1, the mass ratio of bentonite and modified alumina was changed in Examples 4 to 7. As a result, the tensile strength of the insulating layer and the breakdown voltage of the winding wire obtained in Examples 5 to 7 were higher than those in Example 1 and Example 4, indicating that when the mass ratio of bentonite and modified alumina was 2:1 to 3, the mechanical properties and insulation properties of the winding wire could be further improved. By comparing Examples 5 to 7, it was found that the tensile strength of the insulating layer and the breakdown voltage of the winding wire obtained in Example 6 were higher than those in Example 5 and Example 7, indicating that when the mass ratio of bentonite and modified alumina was 1:1, the mechanical properties and insulation properties of the winding wire obtained were higher.

[0081] Compared with Example 6, the preparation method of modified alumina was changed in Example 8. As a result, the tensile strength of the insulating layer and the breakdown voltage of the winding wire prepared in Example 8 were higher than those in Example 6, indicating that the mechanical properties and insulation properties of the winding wire can be further improved by the roasting method.

[0082] Compared with Example 8, the mass ratio of nitride to alumina was changed in Examples 9 to 11. As a result, the tensile strength of the insulating layer and the breakdown voltage of the winding wire obtained in Examples 10 to 11 were higher than those in Examples 8 and 9, indicating that when the mass ratio of nitride to alumina was 1 to 3:3, the mechanical properties and insulation properties of the winding wire could be further improved.

[0083] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An insulated submersible motor winding wire, characterized in that: The invention comprises a wire core, a film layer and an insulating layer from the inside to the outside, wherein the wire core is composed of a conductor and a coating, wherein the conductor is a copper wire, the coating is a nickel coating, the film layer is a polyester film, and the insulating layer comprises the following raw materials in parts by weight: 60-70 parts of polyethylene, 20-30 parts of filler, 1-3 parts of silane coupling agent, 1-2 parts of lubricant, and 2-3 parts of antioxidant; the filler comprises bentonite and modified alumina; The modified aluminum oxide is obtained by modifying aluminum oxide with nitride; The mass ratio of the bentonite to the modified alumina is 2:1-3; The raw materials of the modified alumina include nitride, alumina and magnesium citrate.

2. The insulated submersible motor winding wire according to claim 1, characterized in that: The mass ratio of the nitride to alumina is 1-3:3, and the added amount of the magnesium citrate is 5%-6% of the total mass of the nitride and alumina.

3. The insulated submersible motor winding wire according to claim 1, characterized in that: The nitride includes one or both of silicon nitride and aluminum nitride.

4. The insulated submersible motor winding wire according to claim 1, characterized in that: The preparation method of the modified alumina comprises the following steps: dissolving magnesium citrate in a solvent, adding nitride and alumina to mix, and obtaining the modified alumina after drying and roasting.

5. The insulated submersible motor winding wire according to claim 4, characterized in that: The calcination temperature is 400-500° C., and the calcination time is 2-4 hours.

6. The insulated submersible motor winding wire according to claim 1, characterized in that: The silane coupling agent includes one or more of silane coupling agent KH-550, silane coupling agent KH-570, and silane coupling agent KH-560.

7. The insulated submersible motor winding wire according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 168 , antioxidant 1076 , and antioxidant 225 .

8. A method for preparing an insulated submersible motor winding wire according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, coating the outer side of the copper wire with a nickel plating layer to obtain a wire core; S2, wrapping a polyester film around the outer side of the wire core to obtain a film layer, forming a semi-finished winding wire; S3. After mixing the raw materials for the insulating layer, the raw materials are extruded and wrapped on the outer side of the semi-finished winding wire to obtain the insulated submersible motor winding wire.

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