High-temperature-resistant ultrathin insulated wire as well as preparation method and application thereof

Abstract

The invention provides a high-temperature-resistant ultrathin insulated wire and a preparation method and application thereof. The high-temperature-resistant ultrathin insulated wire comprises a conductor and a fiber belt layer wrapping the conductor. An insulating paint layer is also coated outside the fiber belt layer; and the total thickness of the fiber belt layer and the insulating paint layer at one side is 0.03-0.10 mm. According to the technical scheme, the excellent high-temperature-resistant characteristic of a high-temperature-resistant electromagnetic wire in the prior art is reserved, meanwhile, the thickness of the insulating layer of the wire can be further reduced, and therefore the high-performance wire with the high-temperature-resistant characteristic, the ultrathin and uniform thickness of the insulating layer and durability is provided; the urgent requirement of the high-temperature-resistant coil on the aspect of size miniaturization is met, and the high-temperature-resistant coil has huge potential in the fields of aerospace and the like.

Description

Technical Field

[0001] The present invention relates to the field of cables, and in particular to a high-temperature resistant ultra-thin insulated wire and a preparation method and application thereof. Background Art

[0002] Electromagnetic wire is a commonly used conductor, typically wound into coils in electrical products like motors and transformers. It utilizes the principle of electromagnetic induction to convert electrical energy into magnetic energy. However, with the increasing diversity of operating environments, the temperature resistance of conventional electromagnetic wire is no longer sufficient for use in aerospace and other fields.

[0003] The insulation layer of the high-temperature resistant electromagnetic wire currently developed in China is usually composed of organic and inorganic materials such as organic insulating varnish and glass fiber. Among them, the glass fiber has thin single filaments and a large number of roots. After the wire is paralleled, the filaments are in strands and are loosely and disorderly arranged. After wrapping, the thickness of the insulation layer will be uneven. At the same time, the single-sided insulation thickness of the electromagnetic wire of this structure is usually more than 0.15mm. Compared with the single-sided insulation thickness of ordinary electromagnetic wire (about 0.1mm), the insulation layer of this type of high-temperature resistant electromagnetic wire is very thick and uneven. In the later use process, there may be problems such as affecting the electric field distribution, reducing the service life of the electromagnetic wire, and increasing the difficulty of laying and using it.

[0004] To meet the urgent need for miniaturized high-temperature coils, there is an urgent need to develop high-temperature resistant wires with thin insulation layers that can maintain high performance while meeting the growing demand for miniaturization and lightweighting of equipment. This requires not only breakthroughs in materials science but also research and innovation in manufacturing processes to produce thin yet durable insulation layers, thereby promoting the development and application of high-temperature resistant magnet wires in higher-end applications.

[0005] Therefore, in response to the problems existing in the existing technology, there is an urgent need to develop a high-temperature resistant wire with a thin insulation layer that can meet the growing requirements of miniaturization and lightweighting of equipment while ensuring high temperature resistance and high performance. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a high-temperature resistant ultra-thin insulated wire and a preparation method and use thereof, so as to solve the problems in the prior art.

[0007] To achieve the above-mentioned purpose and other related purposes, the present invention is achieved through the following technical solutions.

[0008] A first aspect of the present invention provides a high-temperature resistant ultra-thin insulated wire, the wire comprising a conductor and a fiber tape layer wrapped around the conductor; the fiber tape layer is further coated with an insulating varnish layer;

[0009] The total thickness of the fiber tape layer and the insulating varnish layer is 0.03 to 0.10 mm, more preferably 0.04 to 0.07 mm, such as 0.04 mm, 0.05 mm, 0.06 mm, or 0.07 mm.

[0010] The high-temperature resistant wire provided by the present invention has an insulation layer (fiber tape layer and insulating paint layer) with a thickness of only 0.03 to 0.10 mm, which is significantly smaller than that of existing high-temperature resistant wires. While maintaining the high performance of traditional high-temperature resistant wires, the high-temperature resistant wire is lightweight, making its insulation layer ultra-thin and uniform, while also being able to meet the requirements for its use under high-temperature conditions, achieving a major breakthrough in the existing technology for high-temperature resistant wires.

[0011] Preferably, the conductor is selected from one or more of copper wire, aluminum wire, silver-plated copper wire and nickel-plated copper wire.

[0012] Preferably, the conductor is a plurality of wires, such as 1, 2, 3, 4, 5, 6, 7, 8, etc.

[0013] More preferably, when the conductor is a single wire, the conductor is selected from one of a flat wire and a round wire.

[0014] More preferably, when the conductor is a plurality of wires, the conductors are selected from round wires and formed into strands, and the cross-sectional area of ​​the strands is 0.05 mm 2 ~30mm 2 . For example, it can be 0.05mm 2 ~10mm 2 , 10mm 2 ~20mm 2 , 20mm 2 ~30mm 2 .

[0015] More preferably, when the conductor is a single wire, the diameter of the round wire is 0.50 mm to 2.00 mm, such as 0.50 mm to 1.0 mm, or 1.0 mm to 2.0 mm.

[0016] More preferably, when the conductor is a single wire, the cross-sectional area of ​​the flat wire is 0.05 mm 2 ~30mm 2 . For example, it can be 0.05mm 2 ~10mm 2 , 10mm 2 ~20mm 2 , 20mm 2 ~30mm 2 .

[0017] Preferably, the thickness of the fiber belt layer is 0.01 mm to 0.05 mm.

[0018] Preferably, the overlap rate of the fiber tape layer is 0-66%, such as 0-50%, 50-66%.

[0019] Preferably, the fiber tape layer is obtained by paralleling alkali-free glass monofilaments.

[0020] Preferably, the diameter of the alkali-free glass monofilament is 0.03-0.3, and the number of the monofilaments is 100-5000. More preferably, the diameter of the alkali-free glass monofilament is 0.03-0.05, and the number of the monofilaments is 3600-4800. For example, the diameter of the alkali-free glass monofilament can be 0.03-0.05, 0.05-0.1, 0.1-0.2, or 0.2-0.3; for example, the number of the alkali-free glass monofilaments can be 3000-3600, 3600-4200, 4200-4800, or 4500-5000.

[0021] The diameter and number of alkali-free glass monofilaments are specific parameters. If the diameter of the alkali-free glass monofilaments is too thick, the insulation layer will be unnecessarily thickened. If the diameter of the alkali-free glass monofilaments is too thin, the wires may break during production. If the number of alkali-free glass monofilaments is too small, there is a high risk of leakage, posing a serious safety hazard. If the number of alkali-free glass monofilaments is too large, the insulation layer will also be unnecessarily thickened. Only within the range of 0.03-0.3mm in diameter and 100-5000 filaments can the insulation layer of the final conductor be made as thin as possible while maintaining good insulation performance.

[0022] Preferably, the insulating paint layer is formed by coating a high-temperature resistant insulating paint on the outside of the fiber tape layer, and the high-temperature resistant insulating paint comprises the following raw materials in parts by weight:

[0023] 30-50 parts of silicone resin,

[0024] 20-40 parts of nanomaterials,

[0025] Organic solvent 5~10.

[0026] For example, the weight proportion of the silicone resin may be 30, 40, or 50 parts; the weight proportion of the nanomaterial may be 20, 30, or 40 parts; and the weight proportion of the organic solvent may be 5, 6, 7, 8, 9, or 10 parts.

[0027] Preferably, the organosilicon resin is selected from one or both of methylphenylpolysiloxane resin and polymethylsiloxane resin. The organosilicon resin has a number average molecular weight of 2000 to 3500, more preferably 2500 to 3000.

[0028] Preferably, the nanomaterial is selected from one or more of magnesium oxide, aluminum oxide, silicon dioxide and titanium dioxide.

[0029] Preferably, the organic solvent is selected from one or more of toluene, xylene and pyrrolidone.

[0030] Preferably, the method for preparing the high-temperature resistant insulating varnish comprises the following steps: uniformly mixing the nanomaterial and an organic solvent, and then mixing the mixture with an organic silicone resin in a reaction kettle. More preferably, the mixing temperature is 50-80°C; and before use, the high-temperature resistant insulating varnish is adjusted to a viscosity of 25°C using an organic solvent for 80-120 seconds.

[0031] The second aspect of the present invention provides a method for preparing the high-temperature resistant ultra-thin insulated wire as described above, the method comprising the following steps: providing a conductor; drawing and pre-treating the alkali-free glass monofilaments to form a fiber band, and then wrapping the fiber band around the conductor; washing the conductor wrapped with the fiber band, and impregnating it with a high-temperature resistant insulating varnish, and obtaining the high-temperature resistant ultra-thin insulated wire after curing.

[0032] Preferably, the pretreatment includes dipping the paralleled fiber tape precursor into a self-adhesive varnish, extruding the fiber tape precursor after dipping, and drying the fiber tape precursor.

[0033] Preferably, the self-adhesive paint is selected from alcohol-soluble self-adhesive paints.

[0034] This application specifically uses an alcohol-soluble self-adhesive lacquer with a solids content of 5% to 80%. More preferably, it has a solids content of 10% to 50%, such as 10% to 25% or 25% to 50%. This alcohol-soluble self-adhesive lacquer has the characteristics of quick drying, high bonding strength, and good flexibility. When used to impregnate the fiber tape precursor, it not only ensures a tighter and more stable bond between the alkali-free glass filaments after paralleling, but also acts as a lubricant, ensuring a more uniform and orderly distribution of the individual filaments within the long tape, facilitating the subsequent formation of a thinner and more uniform insulation layer. Furthermore, this alcohol-soluble self-adhesive lacquer is easier to remove without any adverse effects on subsequent production and processing.

[0035] Preferably, the pressure of the extrusion treatment is 5 to 50 N, more preferably 8 to 25 N, such as 8 to 15 N, or 15 to 25 N.

[0036] The extrusion process in this application is also a very important process. Through extrusion after impregnation, the compactness of the alkali-free glass filaments is further strengthened and consolidated, while the excess alcohol-soluble self-adhesive paint is squeezed out, further reducing the distance between the individual filaments, thereby providing a thinner fiber layer. The pressure of the extrusion process is also specific. If the pressure is too low or no extrusion is performed, the compactness of the alkali-free glass filaments cannot be further increased. At the same time, if the extrusion pressure is too high, the filaments may be over-compressed, and may even damage the internal structure of the filaments, resulting in individual filament breakage or damage to their physical properties. In addition, excessive pressure may cause excessive extrusion of the alcohol-soluble self-adhesive paint, resulting in unstable fiber tape quality.

[0037] Preferably, the drying temperature is 150-320°C, more preferably 200-300°C, such as 200-250°C, or 250-300°C.

[0038] Preferably, one or more of methanol, ethanol, methanol-water solution and ethanol-water solution are used for washing.

[0039] More preferably, based on the weight of the methanol-water solution, the mass ratio of methanol to water is 0.1-5:0.1-10, for example, 1:1.

[0040] More preferably, based on the weight of the ethanol-water solution, the mass ratio of ethanol to water is 0.1-5:0.1-10, for example, 1:1.

[0041] The washing process is essential. If the fiber layer is not washed, the alcohol-soluble self-adhesive paint will remain in the fiber layer, which will cause the insulating paint to be insufficiently impregnated during subsequent coating, thereby affecting the high temperature resistance and insulation performance of the conductor.

[0042] Preferably, the curing temperature is 200°C to 400°C, such as 200°C to 350°C, or 350°C to 400°C.

[0043] A third aspect of the present invention provides a use of the high-temperature resistant ultra-thin insulated wire as described above as an electromagnetic wire or a lead cable in aerospace or high-temperature fields.

[0044] The technical solution of the present invention pre-treats the fiber tape so that the monofilaments in the fiber tape are distributed more orderly and evenly and arranged more closely, so that after wrapping, the thickness of the wire insulation layer is not only uniform, but also ultra-thin and durable.

[0045] The technical aspects of the present invention creatively select a specific alcohol-soluble self-adhesive varnish to impregnate the alkali-free glass monofilament and then combine it with an extrusion process, which not only makes the thickness of the insulation layer of the prepared wire not only uniform and ultra-thin, but also durable, but also the self-adhesive varnish is easy to wash and remove, and will not affect the subsequent production and application of the wire; while retaining the excellent high-temperature resistance of the high-temperature resistant electromagnetic wire in the prior art, it can also further reduce the thickness of the insulation layer of the wire, thereby providing a high-performance wire with high-temperature resistance, an ultra-thin and uniform insulation layer thickness, and durability; it meets the urgent demand for miniaturization of high-temperature resistant coils and has great potential in fields such as aerospace. DETAILED DESCRIPTION

[0046] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0047] Before further describing the specific embodiments of the present invention, it should be understood that the scope of the present invention is not limited to the specific embodiments described below. It should also be understood that the terminology used in the examples is intended to describe specific embodiments and is not intended to limit the scope of the present invention. The experimental procedures in the following examples, where specific conditions are not specified, were generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0048] When the embodiments provide numerical ranges, it should be understood that, unless otherwise specified in the present invention, both endpoints of each numerical range and any numerical value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those generally understood by those skilled in the art. In addition to the specific methods, equipment, and materials used in the embodiments, according to the understanding of the prior art by those skilled in the art and the description of the present invention, any methods, equipment, and materials of the prior art similar or equivalent to the methods, equipment, and materials described in the embodiments of the present invention may also be used to implement the present invention.

[0049] The present application does not impose any specific restrictions on the extrusion process during the pretreatment, as long as the fiber ribbon precursor can be extruded with a pressure within the range of 5 to 50 N. Specifically, in the present application, the fiber ribbon precursor is extruded by pressing a flat plate on the doubling roller shaft.

[0050] The high temperature resistant insulating paint used in the following embodiments of the present application is obtained by the following preparation method:

[0051] 15 parts of aluminum oxide, 15 parts of silicon dioxide and 10 parts of toluene are uniformly mixed to obtain a mixed solution, and then 40 parts of methylphenyl polysiloxane resin (number average molecular weight is 2500-2700) are added to the mixed solution, and mixed in a reactor at a temperature of 65°C. The viscosity of the product is adjusted to 110s (25°C) to obtain a high-temperature resistant insulating varnish;

[0052] Alcohol-soluble self-adhesive paint is from Jiangsu Jiahe Electronic Materials Co., Ltd.; model: JCB-B;

[0053] The wire drawing roller shaft is purchased from Ningbo Kangfeng Cable Equipment Co., Ltd.

[0054] Example 1

[0055] This embodiment provides a specific high temperature resistant ultra-thin wire and its preparation method. The conductor is nickel-plated round copper wire (diameter Φ: 1.00mm)

[0056] The steps include:

[0057] 1) Doubling: Alkali-free glass monofilaments (monofilament diameter: 0.05, number of strands: 3600) were doubling using a doubling roller so that the fiber tape precursor after doubling had a width of 2.00 mm and a thickness of 0.03 mm.

[0058] 2) Pretreatment: The fiber ribbon precursor from step 1) was impregnated with an alcohol-soluble self-adhesive lacquer (10% solids content). A smooth plate was then pressed against the doubling rollers, extruding the impregnated fiber ribbon precursor as it passed over a guide pulley. The doubling rollers were operated at a speed of 2.00 m / min and an extrusion pressure of 15 N. After extrusion, the fiber ribbon was dried at 200°C to obtain a fiber ribbon with a width of 2.00 mm and a thickness of 0.02 mm.

[0059] 3) Wrapping: Wrap the fiber tape in step 2) around the conductor with an overlap rate of 50%.

[0060] 4) Washing: Immerse the wrapped wire in flowing methanol solvent to wash the alcohol-soluble self-adhesive paint on its surface at a flow rate of 10L / min.

[0061] 5) Dipping in high-temperature varnish and curing: The wire obtained in step 4) is coated with high-temperature resistant insulating varnish at a rate of 0.5 m / min and cured in a 200° C. oven to obtain a high-temperature resistant ultra-thin wire.

[0062] Example 2

[0063] This embodiment provides a specific high temperature resistant ultra-thin wire and its preparation method. The conductor is a nickel-plated copper flat wire (2mm*5mm=10mm 2 )

[0064] The steps include:

[0065] 1) Doubling: Alkali-free glass monofilaments (monofilament diameter: 0.03, number of strands: 3600) were doubling using a doubling roller so that the fiber tape precursor after doubling had a width of 1.00 mm and a thickness of 0.05 mm.

[0066] 2) Pretreatment: The fiber ribbon precursor from step 1) was impregnated with an alcohol-soluble self-adhesive lacquer (25% solids content). A smooth plate was then pressed against the doubling rollers, extruding the impregnated fiber ribbon precursor as it passed over a guide pulley. The doubling rollers were operated at a speed of 3.00 m / min and an extrusion pressure of 8 N. After extrusion, the fiber ribbon was dried at 300°C to obtain a fiber ribbon with a width of 1.00 mm and a thickness of 0.035 mm.

[0067] 3) Wrapping: Wrap the fiber tape in step 2) around the conductor with an overlap rate of 50%.

[0068] 4) Washing: Immerse the wrapped wire in flowing ethanol solvent to wash the alcohol-soluble self-adhesive paint on its surface at a flow rate of 20 L / min.

[0069] 5) Dipping in high-temperature varnish and curing: The wire obtained in step 4) is coated with high-temperature resistant insulating varnish at a line speed of 2 m / min and cured in a 400° C. oven to obtain a high-temperature resistant ultra-thin wire.

[0070] Example 3

[0071] This embodiment provides a specific high temperature resistant ultra-thin wire and its preparation method. The conductor is nickel-plated round copper stranded wire (8.98mm 2 )

[0072] The steps include:

[0073] 1) Wire drawing: Alkali-free glass monofilaments (monofilament diameter: 0.05, number of strands: 4800) are wired using a wire drawing roller so that the width of the fiber tape precursor after wire drawing is 2.50 mm and the thickness is 0.03 mm.

[0074] 2) Pretreatment: The fiber ribbon precursor from step 1) was impregnated with an alcohol-soluble self-adhesive lacquer (50% solids content). A smooth plate was then pressed against a doubling roller, extruding the impregnated fiber ribbon precursor as it passed over a guide pulley. The doubling roller was operated at a speed of 3.00 m / min and an extrusion pressure of 8 N. After extrusion, the fiber ribbon was dried at 250°C, resulting in a fiber ribbon with a width of 2.50 mm and a thickness of 0.02 mm.

[0075] 3) Wrapping: Wrap the fiber tape in step 2) around the conductor with an overlap rate of 66%.

[0076] 4) Washing: Immerse the wrapped wire in a flowing methanol-water solution (the weight ratio of methanol to water is 1:1)

[0077] , wash the alcohol-soluble self-adhesive paint on its surface at a flow rate of 30L / min.

[0078] 5) Dipping in high-temperature varnish and curing: The wire obtained in step 4) is coated with high-temperature resistant insulating varnish at a line speed of 2 m / min and cured in a 350° C. oven to obtain a high-temperature resistant ultra-thin wire.

[0079] Comparative Example 1

[0080] This comparative example provides a specific high-temperature resistant wire and a preparation method thereof.

[0081] The steps include:

[0082] Except that step 2) and step 4) are not performed, the other parts are exactly the same as those in Example 1.

[0083] Comparative Example 2

[0084] This comparative example provides a specific high-temperature resistant wire and a preparation method thereof.

[0085] The steps include:

[0086] Except for the use of hot-melt self-adhesive paint for impregnation in step 2), the other parts are exactly the same as those in Example 1.

[0087] The results showed that the hot-melt self-adhesive varnish could not be removed by washing, and forced wiping would damage the fiber tape. Furthermore, in step 5), the hot-melt self-adhesive varnish was not successfully removed, making it impossible to completely and evenly apply or cover the high-temperature resistant insulating varnish. This prevented the insulating varnish from forming a layer and made it impossible to obtain a conductor.

[0088] Effect Examples

[0089] The applicant conducted performance tests on the wires prepared in Examples 1 to 3 and Comparative Example 1, specifically:

[0090] The thickness of one side of the insulation layer shall be measured in accordance with GB / T 4074.2-2024.

[0091] Breakdown voltage test: the number of twist pairs and test methods for round wires and stranded wires shall refer to GB / T4074.5-2024, and the sample shall be prepared by the manual twisting method; the flat wire shall be tested by the U-type method in accordance with GB / T4074.5-2024 standard;

[0092] The test method of room temperature insulation resistance and high temperature insulation resistance refers to GB / T4074.5-2024, and the test result of high temperature insulation resistance is 500℃, 2 hours test result;

[0093] Bending performance test, refer to GB / T4074.3-2024 standard;

[0094] See Table 1 for specific results.

[0095] Table 1

[0096]

[0097] The room-temperature insulation resistance of a conductor refers to the resistance value of the conductor insulation layer at a normal ambient temperature (20° C. in this embodiment). This parameter is very important for evaluating the insulation performance of the conductor and preventing electrical faults. The higher the room-temperature insulation resistance of the conductor, the better the insulation performance and electrical fault prevention performance of the conductor.

[0098] The high-temperature insulation resistance of a conductor refers to the resistance value of the conductor insulation layer at a high-temperature ambient temperature (the test temperature in this embodiment is 500°C and the test time is 2 hours). This parameter is very important for evaluating the insulation performance of the conductor in a high-temperature environment and preventing electrical faults. The higher the high-temperature insulation resistance of the conductor, the better the insulation performance and electrical fault prevention performance of the conductor during high-temperature operation.

[0099] A conductor's bendability refers to its ability to withstand bending without damage under certain conditions. This performance characterizes the conductor's reliability and durability in practical applications. The smaller the diameter indicated by the bendability indicator, the better the conductor's bendability, reliability, and durability.

[0100] As can be seen from Table 1, the thickness of the insulation layer of the wire prepared by the technical solution of the present application is 0.04-0.07 mm on one side, which is much smaller than the thickness of the insulation layer on one side in Comparative Example 1 (the conventional high-temperature resistant wire in the prior art), thereby achieving lightweight insulation of the high-temperature resistant wire. As can be seen from Examples 1-3 and Comparative Example 1, the breakdown voltage, room-temperature insulation resistance, and high-temperature insulation resistance of the wire prepared by the technical solution of the present application are substantially equivalent to those of the wire in Comparative Example 1, and are fully capable of meeting the high-performance requirements for high-temperature resistant wires in the prior art. At the same time, as can be seen from Examples 1-3 and Comparative Example 1, the bending performance of the wire prepared by the technical solution of the present application is excellent, being 5D, which is significantly better than the bending performance of the wire in Comparative Example 1, indicating that the wire provided by the technical solution of the present application has better reliability and durability in practical applications.

[0101] To sum up, the wire provided by the technical solution of this application can achieve lightweighting of high-temperature resistant wires while maintaining the high performance requirements of high-temperature resistant wires, making the thickness of the insulation layer on one side significantly thinner and more uniform. At the same time, it has excellent bending performance, good reliability and durability in practical applications, and has great potential in aerospace and other fields.

[0102] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A high temperature resistant ultra-thin insulated wire, characterized in that: The wire comprises a conductor and a fiber tape layer wrapped around the conductor; the fiber tape layer is also coated with an insulating paint layer; The total thickness of the fiber tape layer and the insulating paint layer is 0.03-0.10 mm.

2. The wire according to claim 1, characterized in that: The conductor is selected from one or more of copper wire, aluminum wire, silver-plated copper wire and nickel-plated copper wire; And / or, the conductor is a plurality of wires; And / or, the thickness of the fiber belt layer is 0.01 mm to 0.05 mm; And / or, the overlap rate of the fiber belt layer is 0-66%; And / or, the fiber tape layer is obtained by doubling alkali-free glass monofilaments; And / or, the insulating paint layer is formed by coating a high temperature resistant insulating paint on the outside of the fiber tape layer, and the high temperature resistant insulating paint comprises the following raw materials in parts by weight: 30-50 parts of silicone resin, 20-40 parts of nanomaterials, Organic solvent 5~10.

3. The wire according to claim 2, characterized in that: When the conductor is a single wire, the conductor is selected from one of a flat wire and a round wire; And / or, when the conductor is a plurality of wires, the conductors are selected from round wires and formed into strands, and the cross-sectional area of ​​the strands is 0.05 mm 2 ~30mm 2 ; And / or, the diameter of the alkali-free glass monofilament is 0.03-0.3, and the number of the monofilaments is 100-5000; And / or, the silicone resin is selected from one or both of methylphenyl polysiloxane resin and polymethylsiloxane resin; And / or, the nanomaterial is selected from one or more of magnesium oxide, aluminum oxide, silicon dioxide and titanium dioxide; And / or, the organic solvent is selected from one or more of toluene, xylene and pyrrolidone.

4. The wire according to claim 3, characterized in that: When the conductor is a single wire, the diameter of the round wire is 0.50 mm to 2.00 mm; And / or, when the conductor is a single wire, the cross-sectional area of ​​the flat wire is 0.05mm 2 ~30mm 2 ; And / or, the method for preparing the high temperature resistant insulating varnish comprises the following steps: mixing the nano material and the organic solvent evenly, and then mixing them with the organic silicon resin in a reaction kettle.

5. A method for preparing a high temperature resistant ultra-thin insulated wire according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: providing a conductor; drawing and pre-treating the alkali-free glass monofilaments to form a fiber band and then wrapping the fiber band around the conductor; washing the conductor wrapped with the fiber band, impregnating it with a high-temperature resistant insulating varnish, and curing it to obtain the high-temperature resistant ultra-thin insulated wire.

6. The preparation method according to claim 5, characterized in that: The pretreatment comprises dipping the fiber tape precursor after the paralleling into a self-adhesive paint, extruding the fiber tape precursor after the dipping, and drying the fiber tape precursor.

7. The preparation method according to claim 6, characterized in that: The self-adhesive paint is selected from alcohol-soluble self-adhesive paint; And / or, the pressure of the extrusion treatment is: 5 to 50N; And / or, the drying temperature is 150-320°C.

8. The preparation method according to claim 5, characterized in that: Washing is performed using one or more of methanol, ethanol, a methanol-water solution, and an ethanol-water solution.

9. The preparation method according to claim 5, characterized in that: The temperature during curing is 200°C to 400°C.

10. Use of the high temperature resistant ultra-thin insulated wire according to any one of claims 1 to 4 as an electromagnetic wire or a connecting cable in aerospace.

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