Aerospace high temperature resistant cable core and cable and method of manufacture

Abstract

The application discloses a high-temperature-resistant cable core for aerospace, a cable and a preparation method. The cable core comprises an insulated conductor and an insulating mica tape wrapped outside the insulated conductor, the insulated conductor comprises a conductor core and a first insulating layer wrapped outside the conductor core, and the insulating material of the first insulating layer comprises the following raw materials in parts by weight: 30-50 parts of organic silicon resin, 20-40 parts of inorganic powder and 5-10 parts of solvent. The high-temperature-resistant cable for aerospace can improve the insulation performance and softness of the cable, prolong the high-temperature-resistant time of the cable and has good friction resistance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cables, and particularly relates to a high-temperature-resistant cable core for aerospace and a cable and a preparation method. BACKGROUND

[0002] At present, the field of aerospace is developing rapidly, and cables, as a basic component of energy supply links, have higher requirements due to the development of aerospace equipment technology. The cables not only need to fully meet the requirements of high and low temperature resistance, radiation resistance and aging resistance, but also need to have good bending performance and insulation performance. At present, the softness of the high-temperature-resistant and radiation-resistant special cable core for aerospace on the market is poor, and the high-temperature-resistant and radiation-resistant performance cannot fully meet the use requirements. Therefore, complex external protection is required in use. By improving the preparation process of the cable core, the softness of the cable core is increased, and the high-temperature-resistant and radiation-resistant performance of the cable is greatly improved.

[0003] The conductors prepared by the traditional mica wrapping, glass filament wrapping and braiding process are coated with single-component (except solvent) or low-heat-resistant two-component silicone insulating paint. At present, the conductors prepared on the market often add inorganic powder to the insulating paint to improve the heat resistance of the conductors. Due to the composition and molecular structure of the single-component (except solvent) or high-curing-temperature two-component silicone insulating paint, the service temperature of this type of high-temperature conductor is less than 500 DEG C in a short period, and is lower in long-term use. However, the two-component insulating paint with good temperature resistance has a high content of crosslinking groups, a strong molecular structure and a fast reaction of two components, and can only be used on the surface of metal structural parts to make the surface have high temperature resistance and corrosion resistance, and cannot be used for the preparation of electric wires and cables. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a high-temperature-resistant cable core for aerospace and a cable and a preparation method, so as to solve the problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the technical scheme is as follows.

[0006] The first aspect of the present application protects a high-temperature-resistant cable core for aerospace, which comprises an insulating conductor and an insulating mica tape layer wrapped outside the insulating conductor. The insulating conductor comprises a conductor core and a first insulating layer wrapped outside the conductor core. The insulating material of the first insulating layer comprises the following raw materials by weight:

[0007] 20-50 parts of silicone resin

[0008] 20-40 parts of inorganic powder

[0009] 5-10 parts of solvent.

[0010] In some embodiments, the silicone resin has a weight average molecular weight of 2500-2700. Specifically, it is a methylphenyl polysiloxane resin. It is purchased from Weifang Fule New Material Co., Ltd.

[0011] In some embodiments, the inorganic powder is selected from one or more of silica, magnesium oxide and aluminum oxide.

[0012] Preferably, the inorganic powder is a mixture of silica, magnesium oxide and aluminum oxide.

[0013] More preferably, the mass ratio of the silica, magnesium oxide and aluminum oxide is (1-4):(0.5-2):1.

[0014] In some embodiments, the solvent is selected from one or both of toluene and xylene.

[0015] Preferably, the solvent is a mixture of toluene and xylene.

[0016] More preferably, the mass ratio of the toluene and xylene is (0.5-3):1.

[0017] In some embodiments, the material of the conductor core is a nickel-plated conductor.

[0018] In some embodiments, the method for preparing the insulated conductor is as follows: mixing raw materials according to weight parts to obtain a first insulating layer raw material mixture, and immersing the insulated conductor core in the first insulating layer raw material mixture to obtain the insulated conductor.

[0019] Preferably, the temperature of the immersion is 50-70°C.

[0020] Preferably, the time of the immersion is 8-12h.

[0021] In some embodiments, the insulated mica tape includes a fiber cloth mica tape and a second insulating layer wrapped outside the glass fiber cloth mica tape, and the insulating material of the second insulating layer includes the following raw materials according to weight parts:

[0022] Silane coupling agent 2-7 parts

[0023] Xylene 80-90 parts

[0024] Toluene 5-10 parts.

[0025] Preferably, the silane coupling agent is selected from vinyltri(β-methoxyethoxy)silane (KH-172).

[0026] Preferably, the method for preparing the insulating mica tape comprises the following steps: mixing raw materials according to weight parts to obtain a second insulating layer raw material mixture, impregnating the glass fiber cloth mica tape in the second insulating layer raw material mixture, and drying to obtain the insulating mica tape.

[0027] More preferably, the temperature of the impregnation is 50-70°C.

[0028] More preferably, the time of the impregnation is 4-10h.

[0029] More preferably, the temperature of the drying is 70-120°C.

[0030] More preferably, the time of the drying is 4-10h.

[0031] The second aspect of the present application protects a method for preparing a cable core as described above, comprising the following steps:

[0032] coating a first insulating layer outside the conductor core to form an insulating conductor, and coating a second insulating layer outside the glass fiber cloth mica tape to form an insulating mica tape;

[0033] winding the insulating mica tape outside the insulating conductor to obtain the cable core.

[0034] In some embodiments, the winding coverage rate is 30-70% when winding the insulating mica tape.

[0035] The third aspect of the present application protects a high-temperature-resistant cable for aerospace, comprising a cable core as described above, and further comprising a glass fiber filament, a butyl acetate layer, and an insulating paint layer wound in sequence.

[0036] In some embodiments, the insulating paint of the insulating paint layer comprises the following raw materials by weight parts:

[0037] silazane resin 20-40 parts

[0038] inorganic powder 20-40 parts

[0039] solvent 5-10 parts.

[0040] Preferably, the silazane resin is a methyl polysilazane resin with a weight average molecular weight of 500-900. The methyl polysilazane resin is represented by the following formula (R1SiH-NH-SiR2-N), wherein R1 is methyldichlorosilane, R2 is trichlorosilane, Si is silicon, N is nitrogen, and H is hydrogen.

[0041] Preferably, the inorganic powder is selected from one or more of silicon dioxide, magnesium oxide, and aluminum oxide.

[0042] More preferably, the inorganic powder is a mixture of silicon dioxide, magnesium oxide, and aluminum oxide.

[0043] Further preferably, the mass ratio of the silica, magnesium oxide and aluminum oxide is (1-4): 1: 1.

[0044] Preferably, the solvent is selected from one or both of toluene and xylene.

[0045] More preferably, the solvent is a mixture of toluene and xylene.

[0046] Further preferably, the mass ratio of the toluene and xylene is (0.5-3): 1.

[0047] The fourth aspect of the present application protects a method for preparing the cable as described above, wherein the cable core is first wrapped with glass fiber filaments, immersed in a butyl acetate solution, and coated with insulating paint.

[0048] In some embodiments, the butyl acetate solution is an ethanol solution of butyl acetate. Preferably, the concentration of the ethanol solution of butyl acetate is 2-8 wt%.

[0049] In some embodiments, when the cable core is wrapped with glass fiber filaments, the number of wrapping layers is at least 2.

[0050] Preferably, the braiding density of the glass fiber filaments is 90%-95%.

[0051] In some embodiments, the temperature of the immersion is 20-45°C.

[0052] In some embodiments, the time of the immersion is 15-45 min.

[0053] In some embodiments, after the immersion, drying is further included.

[0054] Preferably, the drying temperature is 50-80°C.

[0055] Preferably, the drying time is 5-10 min.

[0056] In some embodiments, at least two layers of insulating paint are applied.

[0057] In some embodiments, heating treatment is performed after each layer of insulating paint is applied, and the heating temperature is 120-300°C.

[0058] Preferably, the heating temperature when the first layer of insulating paint is applied is 70-170°C.

[0059] Preferably, the heating temperature when the second layer of insulating paint is applied is 200-300°C.

[0060] A fifth aspect of the present application protects the use of the cable core described above or the cable described above in an aerospace device.

[0061] In certain embodiments, the aerospace device comprises an engine, a rocket engine, telemetry, power control systems, satellite excitation drive systems, nuclear reactor core control and inductive testing devices.

[0062] The present application ensures the flexibility of the wire by preparing the cable core through online reaction by respectively pre-treating the conductor core with the first insulating material containing silicone resin and the mica tape with the second insulating material containing silane coupling agent, and combining the silicone resin and the silane coupling agent in the wrapping process, and overcomes the limitations of the traditional process.

[0063] The present application also provides a cable, which is first woven with glass fiber filaments outside the cable core, then impregnated with butyl acetate, and finally uses a methyl polysilazane resin with excellent rigidity, friction resistance and waterproof performance as an adhesive, so as to form an inner-soft outer-rigid structure, so that the cable has both high-temperature resistance and radiation resistance, and can realize the bending and friction resistance of the cable. Finally, the wire can maintain good electrical insulation performance and mechanical and physical properties at 800-1000 DEG C for a short time and 600-750 DEG C for a long time, and can also realize good winding and penetrating ability in the space of the equipment.

[0064] Compared with the prior art, the present application has the following beneficial effects:

[0065] The aerospace high-temperature-resistant cable of the present application can improve the insulation performance and softness of the cable, so that the cable has a longer high-temperature resistance time and good friction resistance. DETAILED DESCRIPTION

[0066] The following specific examples illustrate the embodiments of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure.

[0067] Before further describing the specific embodiments of the present application, it should be understood that the scope of protection of the present application is not limited to the following specific embodiments; it should also be understood that the terms used in the embodiments of the present application are for describing the specific embodiments, not for limiting the scope of protection of the present application. The test methods not specified in the following examples are usually carried out under conventional conditions, or under the conditions recommended by the manufacturers.

[0068] When the embodiments give numerical ranges, it is understood that every numerical range given can be used interchangeably with any other numerical range given, and that every numerical value given as the lower or upper limit of a range can also be used interchangeably as the exact numerical value. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Except in the Examples, or where otherwise explicitly indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application, exemplary methods and materials are described herein.

[0069] A first aspect of the present application protects a high temperature resistant cable core for aerospace, the cable core comprising an insulated conductor and an insulating mica tape wrapped outside the insulated conductor, the conductor comprising a conductor core and a first insulating layer wrapped outside the conductor core, the insulating material of the first insulating layer comprising raw materials in the following weight parts:

[0070] Silicone resin 20-50 parts

[0071] Inorganic powder 20-40 parts

[0072] Solvent 5-10 parts.

[0073] In some embodiments, the weight parts of the silicone resin can be 20-30 parts, or 25-35 parts, or 40-50 parts. In a preferred embodiment, it is 25 parts, 30 parts, or 40 parts.

[0074] In some embodiments, the weight parts of the silicone resin can be 20-30 parts, or 25-35 parts, or 40-50 parts. In a preferred embodiment, it is 25 parts, 30 parts, or 40 parts.

[0075] In some embodiments, the weight parts of the inorganic powder can be 20-30 parts, or 25-35 parts, or 30-40 parts. In a preferred embodiment, it is 25 parts, 22 parts, or 40 parts.

[0076] In some embodiments, the inorganic powder is selected from one or more of silicon dioxide, magnesium oxide, and aluminum oxide. Preferably, the inorganic powder is a mixture of silicon dioxide, magnesium oxide, and aluminum oxide. More preferably, the mass ratio of silicon dioxide, magnesium oxide, and aluminum oxide is (1-4):(0.5-2):1. Specifically, the mass ratio can be (1-2.5):(0.5-2):1, or (2-3.5):(0.5-2):1, or (3-4):(0.5-2):1. In a preferred embodiment, it is 5:2:3.

[0077] In some embodiments, the solvent can be 5-7 parts by weight, 6-8 parts by weight, or 7-10 parts by weight. In a preferred embodiment, it is 5 parts, 8 parts, or 10 parts.

[0078] In some embodiments, the solvent is selected from one or both of toluene and xylene. Preferably, the solvent is a mixture of toluene and xylene. More preferably, the mass ratio of toluene to xylene is (0.5-3):1. Further preferably, it can be (0.5-1.5):1, (1-2.5):1, or (2-3):1. In a preferred embodiment, it is 1:1.

[0079] In some embodiments, the conductor core is made of a nickel-plated conductor.

[0080] In some embodiments, the method for preparing the insulated conductor comprises mixing raw materials in a weight ratio to obtain a first insulating layer raw material mixture, and immersing the conductor core in the first insulating layer raw material mixture to obtain the insulated conductor.

[0081] Preferably, the temperature during immersion is 50-70°C. More preferably, it can be 50-70°C, 50-70°C, or 50-70°C. In a preferred embodiment, it is 50°C, 60°C, 65°C, or 70°C.

[0082] Preferably, the time during immersion is 8-12 hours. More preferably, it can be 8-12 hours, 8-12 hours, or 8-12 hours. In a preferred embodiment, it is 12 hours, 10 hours, or 8 hours.

[0083] In some embodiments, the insulated mica tape comprises a fiber cloth mica tape and a second insulating layer wrapped around the glass fiber cloth mica tape, and the insulating material of the second insulating layer comprises raw materials in the following weight ratio:

[0084] Silane coupling agent 2-7 parts

[0085] Xylene 80-90 parts

[0086] Toluene 5-10 parts.

[0087] In some embodiments, the silane coupling agent can be 2-4 parts by weight, 3-6 parts by weight, or 5-7 parts by weight. In a preferred embodiment, it is 5 parts, 4 parts, or 7 parts. Preferably, the silane coupling agent is selected from vinyltri(β-methoxyethoxy)silane (KH-172). Specifically, KH-172 is purchased from Nanjing Rongan Chemical Technology Co., Ltd.

[0088] In some embodiments, the weight parts of the toluene can be 80-84 parts, 83-86 parts, or 85-90 parts. In a preferred embodiment, 80 parts, 85 parts, or 84 parts.

[0089] In some embodiments, the weight parts of the toluene can be 80-84 parts, 83-86 parts, or 85-90 parts. In a preferred embodiment, 80 parts, 85 parts, or 84 parts.

[0090] Preferably, the preparation method of the insulated mica tape is as follows: mixing the raw materials according to the weight parts to obtain a second insulation layer raw material mixture, immersing the glass fiber cloth mica tape in the second insulation layer raw material mixture, and drying to obtain the insulated mica tape.

[0091] More preferably, the impregnation temperature is 50-70°C. More preferably, the temperature can be 50-60°C, 55-65°C, or 50-70°C. In a preferred embodiment, 50°C.

[0092] More preferably, the impregnation time is 4-10h. More preferably, the time can be 4-7h, 6-8h, or 7-10h. In a preferred embodiment, 6h.

[0093] More preferably, the drying temperature is 70-120°C. Further preferably, the drying temperature can be 50-60°C, 55-65°C, or 50-70°C. In a preferred embodiment, 50°C.

[0094] More preferably, the drying time is 4-10h. More preferably, the drying time can be 4-7h, 6-8h, or 7-10h. In a preferred embodiment, 6h.

[0095] The second aspect of the present application protects a preparation method of a cable core as described above, comprising the following steps:

[0096] coating a first insulation layer outside the conductor core to form an insulated conductor, and coating a second insulation layer outside the glass fiber cloth mica tape to form an insulated mica tape;

[0097] winding the insulated mica tape outside the insulated conductor to obtain the cable core.

[0098] In some embodiments, the winding coverage rate is 30-70% when winding the insulated mica tape. Preferably, it can be 30-50%, 45-65%, or 60-70%. In a preferred embodiment, 50%, 70%, or 65%.

[0099] A third aspect of the present application protects a high-temperature resistant cable for aerospace, comprising the cable core as described above, and further sequentially wrapped with a glass fiber filament, a butyl acetate layer and an insulating paint layer.

[0100] In some embodiments, the insulating paint of the insulating paint layer comprises the following raw materials by weight:

[0101] Silazane resin 20-40 parts

[0102] Inorganic powder 20-40 parts

[0103] Solvent 5-10 parts.

[0104] In some embodiments, the weight of the silazane resin can be 20-26 parts, 25-32 parts, or 30-40 parts. In a preferred embodiment, it is 30 parts, 25 parts, 35 parts, or 40 parts.

[0105] Preferably, the weight average molecular weight of the silazane resin is 500-900, and it is a methyl polysilazane resin. The methyl polysilazane resin is composed of methyl dichlorosilane and trichlorosilane, and is a mixture of six-membered and eight-membered cyclic and linear methyl polysilazane with Si-N and methyl double chains on the side chain, with the chemical formula (R1SiH-NH-SiR2-N), wherein R1 is methyl dichlorosilane, R2 is trichlorosilane, Si is silicon, N is nitrogen, and H is hydrogen.

[0106] In some embodiments, the weight of the inorganic powder can be 20-26 parts, 25-32 parts, or 30-40 parts. In a preferred embodiment, it is 20 parts, 25 parts, or 30 parts. Preferably, the inorganic powder is selected from one or more of silica, magnesium oxide, and aluminum oxide. More preferably, the inorganic powder is a mixture of silica, magnesium oxide, and aluminum oxide. Further preferably, the mass ratio of the silica, magnesium oxide, and aluminum oxide is (1-4):1:1. Specifically, it can be (1-2):1:1, (1.5-3):1:1, or (2.5-4):1:1. In a preferred embodiment, it is 2:1:1.

[0107] In some embodiments, the weight parts of the solvent benzene can be 5-7 parts, 6-8 parts, or 7-10 parts. In a preferred embodiment, 10 parts, 5 parts, or 8 parts. Preferably, the solvent is selected from one or both of toluene and xylene. More preferably, the solvent is a mixture of toluene and xylene. Further preferably, the mass ratio of toluene and xylene is (0.5-3):1. Further preferably, it can be (0.5-1.5):1, (1-2.5):1, or (2-3):1. In a preferred embodiment, 1:1.

[0108] The fourth aspect of the present application protects a method for preparing the cable as described above, wherein the cable core is first wrapped with glass fiber filaments, immersed in a butyl acetate solution, and coated with insulating paint.

[0109] In some embodiments, the butyl acetate solution is an ethanol solution of butyl acetate. Preferably, the concentration of the ethanol solution of butyl acetate is 2-8 wt%. The butyl acetate layer in this application is conducive to the adhesion of the insulating paint.

[0110] In some embodiments, when the glass fiber filaments are used for wrapping, the number of wrapping layers is at least 2.

[0111] Preferably, the weaving density of the glass fiber filaments is 90%-95%.

[0112] In some embodiments, the temperature of the immersion is 20-45°C. Preferably, the temperature can be 20-25°C, 25-30°C, or 30-45°C. In a preferred embodiment, 25°C, 50°C, 30°C, or 45°C.

[0113] In some embodiments, the time of the immersion is 15-45 min. Preferably, the time can be 10-20 min, 15-30 min, or 20-45 min. In a preferred embodiment, 10 min, 20 min, or 15 min.

[0114] In some embodiments, after the immersion, drying is further included.

[0115] Preferably, the drying temperature is 50-80°C. Preferably, the drying temperature can be 50-60°C, 55-65°C, or 60-80°C. In a preferred embodiment, 50°C, 70°C, or 80°C. Preferably, the drying time is 5-10 min. Preferably, the drying time can be 5-7 min, 6-8 min, or 7-10 min. In a preferred embodiment, 5 min, 6 min, or 8 min.

[0116] In some embodiments, at least two layers of insulating paint are applied.

[0117] In some embodiments, the heating temperature is 120-300°C for each coating of the insulating varnish layer.

[0118] Preferably, the heating temperature is 70-170°C for coating the first insulating varnish layer.

[0119] More preferably, the temperature can be 70-100°C, 80-120°C, or 110-170°C. In a preferred embodiment, the temperature is 120°C.

[0120] Preferably, the heating temperature is 200-300°C for coating the second insulating varnish layer.

[0121] More preferably, the temperature can be 200-250°C, 240-280°C, or 250-300°C. In a preferred embodiment, the temperature is 250°C.

[0122] A fifth aspect of the present application protects the cable core described above or the use of the cable described above in an aerospace device.

[0123] In some embodiments, the aerospace device comprises an engine, a rocket engine, telemetry, a power control system, a satellite excitation drive system, a nuclear reactor core control and inductive testing device.

[0124] In the present application, the thermal expansion coefficients of silicon dioxide, magnesium oxide and aluminum oxide in the inorganic powder are inconsistent, with the smallest being magnesium oxide, the second being silicon dioxide, and the largest being aluminum oxide. After the first insulating material forms the first insulating layer, the organic silicon resin in the first insulating material inside shrinks a little more at high temperature, so the aluminum oxide component is more to compensate for the voids. However, the methyl polysilazane resin in the insulating varnish shrinks less, so the aluminum oxide content is less.

[0125] In the following examples of the present application, the conductor core is a nickel-plated conductor core with a diameter of Φ2.5mm.

[0126] In the following examples of the present application, the cable wire comprises an insulating conductor and, from the inside to the outside, an insulating mica tape layer, a glass fiber, a butyl acetate layer and an insulating varnish layer wrapped around the insulating conductor.

[0127] In the following examples of the present application, the weight average molecular weight of the organic silicon resin is 2500-2700, specifically methylphenyl polysiloxane resin, purchased from Weifang Fule New Material Co., Ltd.

[0128] In the following examples of the present application, the silazane resin is a methyl polysilazane resin with a weight average molecular weight of 500-900, which is represented by the following formula (R1SiH-NH-SiR2-N), wherein R1 is methyldichlorosilane, R2 is trichlorosilane, Si is silicon, N is nitrogen, and H is hydrogen. The methyl polysilazane resin is purchased from Kubo Chemical (Shanghai) Co., Ltd.

[0129] Example 1

[0130] In this example, a high-temperature-resistant cable for aerospace is prepared and obtained, which comprises the following steps:

[0131] 1) Treat the conductor core and the mica tape respectively to obtain an insulated conductor and an insulated mica tape

[0132] Prepare and obtain an insulated conductor:

[0133] Mix the insulating materials of the first insulating layer according to the weight parts to obtain a first insulating layer raw material mixture, immerse the conductor core in the first insulating layer raw material mixture, and immerse at 50°C for 12 hours, the speed should be controlled at 3 meters per minute, to obtain a conductor core coated with a first insulating layer, i.e. a conductor.

[0134] Prepare and obtain an insulated mica tape:

[0135] Mix the insulating materials of the second insulating layer according to the weight parts to obtain a second insulating layer raw material mixture, immerse the pretreated glass fiber cloth mica tape in the second insulating layer raw material mixture, immerse at 50°C for 6 hours, and then dry at 70°C to obtain an insulated mica tape.

[0136] The pretreatment method is: immerse the glass fiber cloth mica tape in acetone solvent at 50°C for 6 hours to remove the low-temperature adhesive and other impurities in the mica tape to obtain a pretreated glass fiber cloth mica tape.

[0137] 2) Insulated mica tape wrapped around the insulated conductor

[0138] Wrap the insulated mica tape around the insulated conductor, and the wrapping overlap rate is 50%.

[0139] 3) Glass filament wrapping

[0140] Weave quartz yarns (weaving density 90%) on the outer surface of the product obtained in 2) to tighten the glass fiber cloth mica tape.

[0141] 4) Immersion in butyl acetate

[0142] Immerse the product obtained in 3) in an ethanol solution of butyl acetate with a concentration of 5wt% at 25°C for 10 minutes, and then dry at 50°C for 5 minutes to fully volatilize the ethanol solvent.

[0143] 5) Coating of insulating paint

[0144] Coating the insulation paint on the product obtained in 4) at 120°C for the first time, the coating rate should be controlled at 1.5 meters per minute; and then coating at 250°C for the second time, the coating rate should be controlled at 1.5 meters per minute, and the coating process is repeated for 3 times.

[0145] In this embodiment, the insulation material of the first insulation layer comprises the following raw materials by weight:

[0146]

[0147] In this embodiment, the insulation material of the second insulation layer comprises the following raw materials by weight:

[0148]

[0149] In this embodiment, the insulation paint of the insulation paint layer comprises the following raw materials by weight:

[0150]

[0151] The preparation method of the insulation paint is as follows: mixing the raw materials according to the weight parts to obtain the insulation paint.

[0152] Example 2

[0153] In this embodiment, a high-temperature-resistant cable for aerospace is prepared and obtained, comprising the following:

[0154] 1) treating the conductor core and the mica tape respectively to obtain an insulated conductor and an insulated mica tape

[0155] Preparation and obtaining of the insulated conductor:

[0156] Mixing the insulation material of the first insulation layer according to the weight parts to obtain a first insulation layer raw material mixture, and immersing the conductor core in the first insulation layer raw material mixture at 60°C for 10 hours, and the rate should be controlled at 5 meters per minute to obtain the insulated conductor.

[0157] Preparation and obtaining of the insulated mica tape:

[0158] Mixing the insulation material of the second insulation layer according to the weight parts to obtain a second insulation layer raw material mixture, and immersing the pretreated glass fiber cloth mica tape in the second insulation layer raw material mixture at 50°C for 6 hours, and then drying it at 70°C to obtain the insulated mica tape.

[0159] The pretreatment method is as follows: immersing the glass fiber cloth mica tape in acetone solvent at 50°C for 6 hours to remove the low-temperature binder and other impurities in the mica tape to obtain the pretreated glass fiber cloth mica tape.

[0160] 2) wrapping the insulated mica tape around the insulated conductor

[0161] The insulating mica tape is wrapped outside the insulating conductor, and the wrapping coverage is 50%.

[0162] 3) Glass fiber wrapping

[0163] The outer surface of the product obtained in 2) is woven with quartz yarns (weaving density 95%), which serves to tightly bind the glass fiber mica tape.

[0164] 4) Immersion in butyl acetate

[0165] The product obtained in 3) is immersed in a 5wt% butyl acetate ethanol solution, immersed at 50°C for 20 minutes, and then dried at 50°C for 6 minutes to fully evaporate the ethanol solvent.

[0166] 5) Coating of insulating paint

[0167] The insulating paint is coated on the product obtained in 4), and one coating is performed at 120°C, with the coating rate controlled at 2 meters per minute; and two coatings are performed at 250°C, with the coating rate controlled at 2 meters per minute, and the coating process is repeated 3 times.

[0168] In this embodiment, the insulating material of the first insulating layer includes the following raw materials in parts by weight:

[0169]

[0170] In this embodiment, the insulating material of the second insulating layer includes the following raw materials in parts by weight:

[0171]

[0172] In this embodiment, the insulating paint of the insulating paint layer includes the following raw materials in parts by weight:

[0173]

[0174] The preparation method of the insulating paint is as follows: the raw materials are mixed according to the parts by weight to obtain the insulating paint.

[0175] Example 3

[0176] In this embodiment, a high-temperature-resistant cable for aerospace is prepared and obtained, which includes the following:

[0177] 1) The conductor core and the mica tape are treated respectively to obtain an insulating conductor and an insulating mica tape

[0178] The insulating conductor is prepared and obtained:

[0179] The insulating material of the first insulating layer is mixed according to the weight parts to obtain a first insulating layer raw material mixture, the conductor core is immersed in the first insulating layer raw material mixture, and the immersion is carried out at 65°C for 10 hours, the speed should be controlled at 4 meters per minute, to obtain an insulating conductor.

[0180] The insulating mica tape is prepared and obtained:

[0181] The insulating material of the second insulating layer is mixed according to the weight parts to obtain a second insulating layer raw material mixture, the pretreated glass fiber cloth mica tape is immersed in the second insulating layer raw material mixture, and the immersion is carried out at 50°C for 6 hours, and then it is dried at 70°C, to obtain an insulating mica tape.

[0182] The pretreatment method is that the glass fiber cloth mica tape is immersed in acetone solvent at 50°C for 6 hours to remove the low-temperature binder and other impurities in the mica tape, to obtain a pretreated glass fiber cloth mica tape.

[0183] 2) Insulating mica tape wrapping insulating conductor

[0184] The insulating mica tape is wrapped outside the insulating conductor, and the wrapping overlap rate is 65%.

[0185] 3) Glass silk wrapping

[0186] The outer surface of the product obtained in 2) is woven with quartz yarn (weaving density 95%), to tightly bind the glass fiber cloth mica tape.

[0187] 4) Butyl acetate

[0188] The product obtained in 3) is immersed in an ethanol solution of butyl acetate with a concentration of 5wt%, at 30°C for 20 minutes, and then dried at 70°C for 8 minutes, to fully volatilize the ethanol solvent.

[0189] 5) Coating insulating paint

[0190] The insulating paint is coated on the product obtained in 4), the first coating is carried out at 120°C, the coating speed should be controlled at 3 meters per minute, the second coating is carried out at 250°C, the coating speed is controlled at 3 meters per minute, and the coating process is repeated 4 times.

[0191] In this embodiment, the insulating material of the first insulating layer includes the following raw materials according to weight parts:

[0192]

[0193] In this embodiment, the insulating material of the second insulating layer includes the following raw materials according to weight parts:

[0194]

[0195] In this embodiment, the insulating paint of the insulating paint layer comprises the following raw materials by weight:

[0196]

[0197] The preparation method of the insulating paint is as follows: mixing the raw materials according to the weight parts to obtain the insulating paint.

[0198] Example 4

[0199] In this embodiment, a high-temperature-resistant cable for aerospace is prepared and obtained, comprising the following:

[0200] 1) Treat the conductor core and the mica tape respectively to obtain an insulating conductor and an insulating mica tape

[0201] Prepare and obtain an insulating conductor:

[0202] Mix the insulating materials of the first insulating layer according to the weight parts to obtain a first insulating layer raw material mixture, immerse the conductor core in the first insulating layer raw material mixture, and immerse at 70°C for 8 hours, the speed should be controlled at 5 meters per minute, to obtain an insulating conductor.

[0203] Prepare and obtain an insulating mica tape:

[0204] Mix the insulating materials of the second insulating layer according to the weight parts to obtain a second insulating layer raw material mixture, immerse the pretreated glass fiber cloth mica tape in the second insulating layer raw material mixture, immerse at 50°C for 6 hours, and then dry it at 70°C, to obtain an insulating mica tape.

[0205] The pretreatment method is as follows: immerse the glass fiber cloth mica tape in acetone solvent at 50°C for 6 hours to remove the low-temperature binder and other impurities in the mica tape, to obtain a pretreated glass fiber cloth mica tape.

[0206] 2) Insulating mica tape wrapping insulating conductor

[0207] Wrap the insulating mica tape around the outside of the insulating conductor, with a wrapping overlap rate of 70%.

[0208] 3) Glass filament wrapping

[0209] Wrap the product obtained in 2) with woven quartz yarn (woven density 95%), which serves to tightly bind the glass fiber cloth mica tape.

[0210] 4) Immersion in butyl acetate

[0211] Immerse the product obtained in 3) in an ethanol solution of butyl acetate with a concentration of 5wt% at 45°C for 15 minutes, and then dry it at 80°C for 5 minutes to fully volatilize the ethanol solvent.

[0212] 5) Coating insulating paint

[0213] The insulation paint is coated on the product obtained in 4) at 120°C for the first time, and the coating rate should be controlled at 3 meters per minute; and then coated at 250°C for the second time, and the coating rate should be controlled at 3 meters per minute, and the coating process is repeated 2 times.

[0214] In this embodiment, the insulation material of the first insulation layer comprises the following raw materials by weight:

[0215]

[0216] In this embodiment, the insulation material of the second insulation layer comprises the following raw materials by weight:

[0217]

[0218] In this embodiment, the insulation paint of the insulation paint layer comprises the following raw materials by weight:

[0219]

[0220]

[0221] The preparation method of the insulation paint is as follows: the raw materials are mixed according to the weight parts to obtain the insulation paint.

[0222] Comparative Example 1

[0223] In this comparative example, the difference from Example 1 is that the mica tape is wrapped around the conductor core and then directly immersed in the mixture formed by the first insulation layer raw material mixture and the second insulation layer raw material mixture, and the remaining steps and raw materials are the same as those in Example 1.

[0224] Comparative Example 2

[0225] In this comparative example, the difference from Example 1 is that the conductor core is immersed in the second insulation layer raw material mixture, and the mica tape is immersed in the first insulation layer raw material mixture, and the remaining steps and raw materials are the same as those in Example 1.

[0226] The aerospace high-temperature-resistant cable lines obtained in Examples 1-4 and Comparative Example 1 are subjected to performance determination according to the GB / T4074 "Winding Wire Test Method" standard, and the results are shown in Table 1.

[0227] Table 1

[0228]

[0229] From Table 1, it can be seen that the cable line obtained by immersing the conductor core in the mixture of the first insulating layer raw material mixed solution and the second insulating layer raw material mixed solution has the worst performance, the insulation performance does not meet the standard requirement, the softness and the friction resistance are the worst; the cable line obtained by immersing the conductor core in the second insulating layer raw material mixed solution and the mica tape in the first insulating layer raw material mixed solution is not soft enough, and the average scratch force is relatively low, being 9.12 N; in the present application, the cable line obtained by immersing the conductor core in the first insulating layer raw material mixed solution and the mica tape in the second insulating layer raw material mixed solution is not cracked at 500 DEG C, the complete radius is less than 4 times the conductor diameter, and the average scratch force is more than 12 N.

[0230] In summary, the cable of the present application has the advantages of high temperature resistance, radiation resistance, easy bending and friction resistance by immersing the conductor and the mica tape in the insulating material respectively, then on-line reaction of the first insulating layer raw material mixed solution and the second insulating layer raw material mixed solution in the wrapping process, so that the cable can keep good electrical insulation performance and mechanical physical performance at 800 DEG C to 1000 DEG C for short time (24 to 48 hours) and at 600 DEG C to 750 DEG C for long time (6000 to 8000 hours), and can be well wound and penetrated in the equipment with small space.

[0231] The above examples only illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above examples without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the present application should be covered by the claims of the present application.

Claims

1. A method for preparing a high temperature resistant aerospace cable, characterized in that, The method comprises the following steps: coating a first insulating layer on the conductor core to form an insulating conductor, and coating a second insulating layer on the glass fiber cloth mica tape to form an insulating mica tape; winding the insulating mica tape on the insulating conductor to obtain a cable core; immersing the cable core in a butyl acetate solution to coat an insulating paint, obtaining the high-temperature-resistant cable for aerospace use; each coating of the insulating paint layer is subjected to heating treatment, and the heating temperature is 120-300°C; the insulating material of the first insulating layer is composed of the following raw materials in parts by weight: organic silicon resin 20-50 parts inorganic powder 20-40 parts solvent 5-10 parts; the organic silicon resin is methylphenyl polysiloxane resin, and the weight average molecular weight of the organic silicon resin is 2500-2700; the insulating material of the second insulating layer is composed of the following raw materials in parts by weight: silane coupling agent 2-7 parts xylene 80-90 parts toluene 5-10 parts; the silane coupling agent is selected from vinyl tri(β-methoxyethoxy) silane; the insulating paint of the insulating paint layer is composed of the following raw materials in parts by weight: silazane resin 20-40 parts inorganic powder 20-40 parts solvent 5-10 parts; the silazane resin is methyl polysilazane resin, and the weight average molecular weight is 500-900; the inorganic powder is selected from one or more of silicon dioxide, magnesium oxide and aluminum oxide; the solvent is selected from one or both of toluene and xylene; the glass fiber cloth mica tape is pretreated glass fiber cloth mica tape, and the pretreatment is that the glass fiber cloth mica tape is immersed in an acetone solvent at 50°C for 6 hours.

2. The production method according to claim 1, wherein The material of the conductor core is a nickel-plated conductor. And / or, the preparation method of the insulating conductor is that the raw materials are mixed according to parts by weight to obtain a first insulating layer raw material mixture, and the conductor core is immersed in the first insulating layer raw material mixture to obtain the insulating conductor.

3. The production method according to claim 2, wherein The temperature of the immersion is 50-70°C.

4. The production method according to claim 1, wherein The preparation method of the insulating mica tape is that the raw materials are mixed according to parts by weight to obtain a second insulating layer raw material mixture, and the glass fiber cloth mica tape is immersed in the second insulating layer raw material mixture and dried to obtain the insulating mica tape.

5. The production method according to claim 4, wherein The temperature of the immersion is 50-70°C; And / or, the temperature of the drying is 70-120°C.

6. The production method according to any one of claims 1 to 5, wherein When the insulating mica tape is wound, the covering rate is 30-70%.

7. The production method according to claim 1, wherein When the glass fiber silk is used for silk wrapping, the number of silk wrapping layers is at least 2; And / or, at least two layers of insulating paint are applied.

8. The high-temperature-resistant cable for aerospace use obtained by the preparation method of any one of claims 1-7.

9. The use of the high-temperature-resistant cable for aerospace use of claim 8 in an aerospace device.

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