Moisture-resistant and high-temperature-resistant wire as well as preparation method and application thereof

Abstract

The invention provides a moisture-resistant and high-temperature-resistant wire and a preparation method and application thereof. And each wire comprises a conductor, and a mica insulating layer, an inorganic fiber insulating layer, a high-temperature-resistant insulating paint layer, a molecular sieve moisture-resistant layer and an outer protective layer which are sequentially coated outside the conductor from inside to outside. The heat-resistant grade of the moisture-resistant and high-temperature-resistant wire can reach 600 DEG C; the characteristics of specific adsorption of the nanoscale molecular sieve on water vapor and desorption in a heating state are combined, so that the water vapor blocking function is achieved in a high-humidity environment, desorption can be achieved at a high temperature to remove residual water molecules, insulation failure caused by water vapor permeation can be reduced, the reliability is greatly improved, and the service life is greatly prolonged; good insulation performance can still be maintained after high-frequency vibration; the cable can be used in a high-temperature, high-humidity and high-frequency vibration environment, and the high-temperature resistance, the moisture resistance and the vibration resistance of a signal or power transmission wire are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of special cables and aerospace equipment accessories, and in particular to a moisture-resistant and high-temperature-resistant wire and a preparation method and application thereof. Background Art

[0002] With the continuous development of the aerospace industry, high-speed aircraft and launch vehicles have continuously increased their requirements for the comprehensive performance of equipment conductors. In particular, in recent years, the urgent demand for reusable rockets has put forward requirements for high-temperature resistant conductors to meet the requirements of long-term moisture resistance and high-frequency vibration resistance. This has brought new challenges to the comprehensive performance of conductor materials, insulation materials, protective materials and cable processing technology.

[0003] Since the aerospace environment has high requirements for the wire's resistance to high temperature, moisture and vibration, inorganic non-metallic insulated wires such as silk-covered wires, ceramic insulated wires, and mineral insulated cables currently have extremely high resistance to high temperature, and therefore have become the first choice in the field of high temperature resistant wires. However, due to the high and low temperature cycle and high humidity environment, inorganic insulating materials such as glass fiber, quartz fiber, aluminum oxide, and magnesium oxide are very susceptible to moisture, resulting in a sharp drop in insulation performance, making it difficult for the above-mentioned inorganic non-metallic materials to be used in the long term.

[0004] Therefore, there is an urgent need to develop a high-performance conductor with excellent service life and comprehensive properties that meet the requirements such as high temperature resistance, moisture and heat resistance, and vibration resistance. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a wire having moisture resistance, high temperature resistance and vibration resistance and a preparation method thereof, so as to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, the present invention is obtained through the following technical solutions:

[0007] One of the purposes of the present invention is to provide a moisture-resistant and high-temperature resistant wire, which includes a conductor and a mica insulation layer, an inorganic fiber insulation layer, a high-temperature resistant insulating paint layer, a molecular sieve water vapor resistant layer and an outer sheath which are sequentially coated on the outside of the conductor from the inside out.

[0008] In certain embodiments, the conductor comprises a nickel-plated conductor or a nickel-clad copper conductor.

[0009] In certain embodiments, the nickel-plated conductor comprises a nickel-plated copper conductor.

[0010] In certain embodiments, the nickel-plated copper conductor comprises nickel-plated copper strands.

[0011] In certain embodiments, the conductor is pre-annealed.

[0012] In certain embodiments, the mica insulation layer includes several layers of mica tape.

[0013] In certain embodiments, the mica tape includes one or more of phlogopite tape, muscovite tape, synthetic mica tape, calcined muscovite tape, and calcined phlogopite tape.

[0014] In certain embodiments, the mica tape has a width of 3-10 mm.

[0015] In certain embodiments, the mica tape has a thickness of 0.05-2.0 mm.

[0016] In certain embodiments, the mica insulating layer has a thickness of 0.1-4.0 mm.

[0017] In certain embodiments, the inorganic fiber insulation layer includes several layers of inorganic fibers.

[0018] In certain embodiments, the inorganic fiber includes one or more of alumina fiber, mullite fiber, silicon carbide fiber, zirconia fiber, basalt fiber, glass fiber and quartz fiber.

[0019] In some embodiments, the inorganic fibers include alumina fibers.

[0020] In certain embodiments, the weight content of aluminum oxide in the aluminum oxide fiber is 50%-100%.

[0021] In certain embodiments, the monofilament diameter of the alumina fiber is 1-16 μm.

[0022] In certain embodiments, the inorganic fiber insulation layer has a thickness of 0.07-1.50 mm.

[0023] In some embodiments, the high temperature resistant insulating paint layer includes several layers of high temperature resistant insulating paint.

[0024] In certain embodiments, the high temperature resistant insulating paint includes the following raw material components: a silane coupling agent, a first organic solvent, and a first resin.

[0025] In certain embodiments, the silane coupling agent includes one or more of tetramethoxysilane, tetraethoxysilane, methyltriethoxysilane, and aminopropyltriethoxysilane.

[0026] In certain embodiments, the raw material components of the high temperature resistant insulating paint include 0.2-0.8 parts by weight of a silane coupling agent.

[0027] In certain embodiments, the first organic solvent includes one or two of toluene, xylene, ethyl acetate, and methyl isobutyl ketone.

[0028] In certain embodiments, the raw material components of the high temperature resistant insulating varnish include 1-15 parts by weight of a first organic solvent.

[0029] In certain embodiments, the first resin includes one or both of polysiloxane and polysilazane.

[0030] In certain embodiments, the polysiloxane includes one or more of methyl polysiloxane resin, methyl phenyl polysiloxane resin, ethoxy polysiloxane resin, methyl ethoxy polysiloxane silicone resin, and ethoxy phenyl polysiloxane resin.

[0031] In certain embodiments, the polysilazane includes one or more of a methylpolysilazane resin, a perhydropolysilazane resin, and a phenylpolysilazane resin.

[0032] In certain embodiments, the mass ratio of the polysiloxane to the polysilazane is 1-4:1, preferably 2-3:1.

[0033] In certain embodiments, the raw material components of the high temperature resistant insulating varnish include 100-260 parts by weight of the first resin.

[0034] In certain embodiments, the high temperature resistant insulating paint comprises the following raw material components in parts by weight: 0.2-0.8 parts of a silane coupling agent, 1-15 parts of a first organic solvent, and 100-260 parts of a first resin.

[0035] In some embodiments, the thickness of the high temperature resistant insulating paint layer is 0.01-0.20 mm.

[0036] In certain embodiments, the method for preparing the high temperature resistant insulating paint comprises the following steps: uniformly mixing a silane coupling agent and a first organic solvent, and then adding a first resin to react to obtain the high temperature resistant insulating paint.

[0037] In certain embodiments, the reaction temperature of the reaction is 50-60° C.; and / or the reaction time is 1-2 h.

[0038] In certain embodiments, the viscosity of the high temperature resistant insulating varnish is adjusted to 60s-180s before use; preferably, the first organic solvent is used to adjust the viscosity of the high temperature resistant insulating varnish.

[0039] In certain embodiments, the mixing method includes stirring and mixing, but is not limited thereto.

[0040] In certain embodiments, the molecular sieve water vapor resistant layer comprises several layers of molecular sieve composite paint.

[0041] In certain embodiments, the raw material components of the molecular sieve composite paint include a structure directing agent, a dispersant, a second resin and a molecular sieve.

[0042] In certain embodiments, the structure directing agent includes one or more of tetrapropylammonium hydroxide, tetrapropylammonium bromide, tetraethylammonium hydroxide, and tetrabutylammonium hydroxide.

[0043] In certain embodiments, the structure directing agent is tetrapropylammonium hydroxide.

[0044] In certain embodiments, the raw material components of the molecular sieve composite paint include 1-5 parts by weight of a structure directing agent.

[0045] In certain embodiments, the structure directing agent is in a solution state, the solvent is water, and the concentration of the structure directing agent solution is 0.05-0.30 mol / L.

[0046] In certain embodiments, the dispersant includes an inorganic dispersant.

[0047] In certain embodiments, the inorganic dispersant includes one or more of sodium silicate, sodium orthophosphate, sodium pyrophosphate, sodium tripolyphosphate and sodium polymetaphosphate.

[0048] In certain embodiments, the sodium polymetaphosphate includes sodium trimetaphosphate and / or sodium hexametaphosphate.

[0049] In certain embodiments, the raw material components of the molecular sieve composite paint include 5-30 parts of dispersant by weight.

[0050] In certain embodiments, the dispersant is in a solution state, the solvent is water, and the concentration of the dispersant solution is 0.1-3.0 wt %.

[0051] In certain embodiments, the second resin includes one or more of epoxy resin, silicone resin, and silicone-modified polyester resin.

[0052] In certain embodiments, the raw material components of the molecular sieve composite paint include 10-40 parts by weight of the second resin.

[0053] In certain embodiments, the molecular sieve includes one or more of a 3A molecular sieve, a 4A molecular sieve, a 5A molecular sieve, a 10X molecular sieve, a 13X molecular sieve, and a ZSM-5 molecular sieve.

[0054] In certain embodiments, the average particle size of the molecular sieve is 0.1-5.0 μm.

[0055] In certain embodiments, the raw material components of the molecular sieve composite paint include 60-180 parts by weight of molecular sieve.

[0056] In certain embodiments, the molecular sieve composite paint comprises the following raw material components in parts by weight: 1-5 parts of a structure directing agent, 5-30 parts of a dispersant, 10-40 parts of a second resin and 60-180 parts of a molecular sieve; the concentration of the structure directing agent is 0.05-0.30 mol / L.

[0057] In certain embodiments, the thickness of the molecular sieve water vapor resistant layer is 0.05-0.30 mm.

[0058] In certain embodiments, the method for preparing the molecular sieve composite paint comprises the following steps: uniformly mixing a structure directing agent and a molecular sieve, and then uniformly adding a dispersant and a second resin to obtain a molecular sieve composite paint.

[0059] In certain embodiments, the structure directing agent and the molecular sieve are uniformly mixed under stirring for 1-2 hours.

[0060] In certain embodiments, the dispersant and the second resin are mixed uniformly under stirring for 2-3 hours.

[0061] In certain embodiments, the outer sheath includes several layers of braided wire.

[0062] In certain embodiments, the metal wire comprises one or more of a stainless steel wire, a nickel-plated copper wire, and a silver-plated copper wire.

[0063] In certain embodiments, the metal wire fiber has a single filament diameter of 0.03-0.15 mm.

[0064] In certain embodiments, the outer protective layer has a thickness of 0.1-1.0 mm.

[0065] A second object of the present invention is to provide a method for preparing the above-mentioned wire, comprising the following steps:

[0066] 1) Preparation of wire core: wrapping the conductor with mica tape and inorganic fiber in turn, and then coating it with high temperature resistant insulating paint to form a wire core;

[0067] 2) coating the outer surface of the wire core with a molecular sieve composite paint; and then weaving metal wires as an outer sheath on the outermost layer to obtain the wire.

[0068] In certain embodiments, the method for preparing the wire specifically includes: wrapping mica tape on the surface of the conductor, wrapping it with inorganic fibers on this basis, and then coating it with a high-temperature resistant insulating paint to form a high-temperature resistant insulating paint layer, and heating and drying it to form a wire core; coating the outside of the wire core with a molecular sieve composite paint and sintering it at a high temperature to form a molecular sieve composite paint layer, and using an outermost layer of braided metal wire as an outer sheath, and each layer of high-temperature resistant insulating paint or molecular sieve composite paint must be heated in a furnace.

[0069] In certain embodiments, the mica tape has 1 to 4 wrapping layers.

[0070] In certain embodiments, the inorganic fiber has 1 to 6 cladding layers.

[0071] In certain embodiments, the high temperature resistant insulating paint is applied 3-6 times.

[0072] In certain embodiments, the molecular sieve composite paint is applied 3-6 times.

[0073] In certain embodiments, a heating step is further included after each application of the high temperature resistant insulating paint; wherein the heating temperature is 150-350°C.

[0074] In certain embodiments, a heating step is further included after each coating of the molecular sieve composite paint; wherein the heating temperature is 250-500°C.

[0075] In certain embodiments, the heating includes, but is not limited to, oven heating.

[0076] In certain embodiments, the line speed of the oven is 1.0-2.5 m / min.

[0077] The third object of the present invention is to protect the application of the above-mentioned wires in the fields of energy development, communications, medical treatment, steel, ships, aerospace, oil exploration, ocean exploration, metal smelting, transportation, signal transmission or power transmission.

[0078] Beneficial effects:

[0079] The present invention provides a moisture-resistant and high-temperature resistant wire, the wire comprising a conductor and a fire-resistant mica insulation layer, an inorganic fiber insulation layer, a high-temperature resistant insulating paint layer, a molecular sieve water vapor resistant layer and an outer sheath which are sequentially coated on the outside of the conductor from the inside to the outside. The heat resistance grade of the wire can reach 600°C, and compared with general high-temperature resistant wires, the heat resistance performance is greatly improved; the wire also combines the specific adsorption of water vapor by nano-scale molecular sieves and the desorption characteristics under heating, and has the function of blocking water vapor in a high-humidity environment, and can be desorbed at high temperature to remove residual water molecules; compared with existing inorganic insulated wires such as silk-covered wires, ceramic insulated wires, and mineral insulated cables, the insulation failure caused by water vapor penetration can be reduced, and the reliability and service life are greatly improved; and after high-frequency vibration, it can still maintain good insulation performance; it can be used in high temperature, high humidity, and high-frequency vibration environments to improve the high temperature resistance, moisture resistance, and vibration resistance of signal or power transmission wires.

[0080] The present invention also provides a method for preparing the above-mentioned wire. The preparation method has relatively fewer production steps, a relatively low wire sintering temperature, a relatively high production efficiency, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Figure 1 Shown is a schematic diagram of the moisture-resistant and high-temperature-resistant wire structure of the present invention.

[0082] Figure 1 The component numbers are as follows:

[0083] 1 conductor;

[0084] 2 Refractory mica insulation layer;

[0085] 3 Inorganic fiber insulation layer;

[0086] 4. High temperature resistant insulating paint layer;

[0087] 5 Molecular sieve water vapor resistant layer;

[0088] 6 Outer sheath. DETAILED DESCRIPTION

[0089] One of the purposes of the present invention is to provide a moisture-resistant and high-temperature-resistant wire, the structure of which is as follows: Figure 1 As shown, the wire includes a conductor 1 and a fire-resistant mica insulation layer 2, an inorganic fiber insulation layer 3, a high-temperature resistant insulating paint layer 4, a molecular sieve water vapor resistant layer 5 and an outer sheath 6 which are sequentially coated on the outside of the conductor 1 from the inside to the outside; this structure enables the wire to have moisture resistance, high temperature resistance and vibration resistance.

[0090] The conductor of the present invention is provided with a fire-resistant mica insulation layer 2, an inorganic fiber insulation layer 3 and a high-temperature resistant insulating paint layer 4. The mica and inorganic fiber with high-temperature resistant properties are used as insulation to increase the high-temperature resistant insulation performance of the conductor. At the same time, the high-temperature resistant insulating paint layer can enhance the compatibility between insulating materials and reduce the degradation of insulation performance caused by defects such as leakage, breakage or damage of insulating materials. The molecular sieve water vapor resistant layer 5 is provided, which has the characteristics of specific adsorption of water vapor and desorption under heating. It blocks water vapor in a high-humidity environment and desorbs residual water molecules at high temperatures, thereby enhancing the moisture and heat resistance of the conductor. The outer sheath 6 is provided, which has an electromagnetic shielding function by adopting a metal wire woven structure, and at the same time protects the wire core from mechanical damage, thereby improving the mechanical properties of the conductor such as friction resistance and vibration resistance.

[0091] In some embodiments, the conductor 1 includes a nickel-plated conductor or a nickel-clad copper conductor; the nickel-plating treatment of the conductor can increase the high temperature resistance and corrosion resistance of the conductor, and prevent the conductor from being affected by high temperature and high humidity environment, resulting in thermal oxidation and chemical corrosion. In the present invention, the conductor can be a round wire, a flat wire or any special-shaped wire.

[0092] In certain embodiments, the nickel-plated conductor comprises a nickel-plated copper conductor.

[0093] In certain embodiments, the nickel-plated copper conductor comprises nickel-plated copper strands.

[0094] In some embodiments, the conductor 1 is an annealed conductor; the annealing treatment can increase the flexibility of the conductor, which is beneficial to improving the processability and bending resistance of the composite insulated wire.

[0095] In certain embodiments, the refractory mica insulation layer 2 includes several layers of refractory mica tapes.

[0096] In some embodiments, the thickness of the refractory mica insulation layer 2 is 0.1-4.0 mm; it can also be 0.1-0.5 mm, it can also be 0.5-1 mm, it can also be 1-2 mm, it can also be 2-3 mm, it can also be 3-4 mm; it can also be 0.1-1 mm, it can also be 0.5-2 mm, it can also be 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm.

[0097] In certain embodiments, the refractory mica tape includes one or more of phlogopite mica tape, muscovite mica tape, synthetic mica tape, calcined muscovite mica tape, and calcined phlogopite mica tape.

[0098] In certain embodiments, the width of the fire-resistant mica tape is 3-10 mm; it can also be 3-5 mm, 5-10 mm, 4-7 mm; it can also be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm.

[0099] In certain embodiments, the thickness of the fire-resistant mica tape is 0.05 mm to 2.0 mm, or 0.05-0.5 mm, or 0.1-1 mm, or 1-2 mm, or 0.5-1.5 mm, or 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, or 2 mm.

[0100] In certain embodiments, the number of layers of the fire-resistant mica tape is 1-4 layers; it can also be 2-3 layers, or it can be 1, 2, 3, or 4 layers.

[0101] In some embodiments, the inorganic fiber insulation layer 3 includes several layers of inorganic fibers.

[0102] In some embodiments, the thickness of the inorganic fiber insulation layer 3 is 0.07-1.50 mm; it can also be 0.07-0.05 mm, 0.1-1 mm, 1-1.5 mm, 0.5-1.5 mm, or 0.1 mm, 0.2 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 1 mm, or 1.5 mm.

[0103] In certain embodiments, the inorganic fiber includes one or more of alumina fiber, mullite fiber, silicon carbide fiber, zirconia fiber, basalt fiber, glass fiber or quartz fiber.

[0104] In some specific embodiments, the inorganic fiber includes alumina fiber; alumina fiber has a higher melting point, better high temperature resistance, electrical insulation performance and flexibility, higher insulation resistance and breakdown voltage in high temperature environment, and can improve the high temperature resistance and insulation performance of the wire.

[0105] In certain embodiments, the weight content of alumina in the alumina fiber is 50%-100%, or can be 60%-80%; preferably, the alumina fiber has an alumina weight content of 72%; too low alumina content will affect the high temperature resistance, and too high alumina content will cause the fiber to be too brittle and prone to breakage during processing.

[0106] In some embodiments, the monofilament diameter of the alumina fiber is 1-16μm, or 1-5μm, or 5-9μm, or 8-10μm, or 9-12μm, or 12-16μm, or 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm or 16μm; the monofilament diameter of the fiber is relatively thin, and multiple strands of fiber are wrapped together, which is not easy to break due to shear force during wrapping and has good flexibility.

[0107] In certain embodiments, the number of layers of the inorganic fibers is 1-6 layers; it can also be 2-5 layers, it can also be 3-4 layers, or it can be 1, 2, 3, 4, 5, or 6 layers.

[0108] In some embodiments, the high temperature resistant insulating paint layer 4 includes several layers of high temperature resistant insulating paint.

[0109] In some embodiments, the thickness of the high temperature resistant insulating paint layer 4 is 0.01-0.20mm; it can also be 0.01-0.1mm, it can also be 0.1-0.2mm, it can also be 0.01-0.15mm, it can also be 0.05-0.1mm, it can also be 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.15mm, 0.2mm.

[0110] In certain embodiments, the high temperature resistant insulating paint comprises the following raw material components: a silane coupling agent, a first organic solvent and a first resin.

[0111] In some embodiments, the raw material components of the high temperature resistant insulating paint include 0.2-0.8 parts of silane coupling agent by weight; it can also be 0.2-0.3 parts, 0.4-0.5 parts, 0.5-0.6 parts, 0.6-0.8 parts, 0.4-0.8 parts, 0.5-0.7 parts; it can also be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 parts.

[0112] In some embodiments, the silane coupling agent includes one or more of tetramethoxysilane, tetraethoxysilane, methyltriethoxysilane and aminopropyltriethoxysilane. The silane coupling agent is used to improve the compatibility between the high temperature resistant insulating paint and the inner layer of inorganic fibers and enhance the bonding force between the insulating layers.

[0113] In certain embodiments, the first organic solvent includes one or more of toluene, xylene, ethyl acetate, and methyl isobutyl ketone.

[0114] In some embodiments, the raw material components of the high temperature resistant insulating paint include 1-15 parts of a first organic solvent by weight, or 2-3 parts, or 4-6 parts, or 8-10 parts, or 12-14 parts, or 3-6 parts, or 6-10 parts, or 8-12 parts, or 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 parts; wherein the first organic solvent is used to adjust the viscosity of the insulating paint, improve the dispersibility between the components of the insulating paint, and improve the uniformity of the high temperature resistant insulating paint layer 4.

[0115] In some embodiments, the raw material components of the high temperature resistant insulating paint include 100-260 parts of the first resin by weight; it can also be 120-140 parts, 150-170 parts, 180-190 parts, 200-220 parts, 230-240 parts, 250-260 parts, 150-240 parts, 180-220 parts, or 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260 parts.

[0116] In certain embodiments, the first resin includes one or both of polysiloxane and polysilazane. Polysiloxane or polysilazane resin is used to improve the insulation performance of the wire.

[0117] In certain embodiments, the polysiloxane includes one or more of methyl polysiloxane resin, methyl phenyl polysiloxane resin, ethoxy polysiloxane resin, methyl ethoxy polysiloxane silicone resin, and ethoxy phenyl polysiloxane resin.

[0118] In certain embodiments, the polysilazane includes one or more of a methyl polysilazane resin, a perhydropolysilazane resin, and a phenyl polysilazane resin.

[0119] In certain embodiments, the mass ratio of the polysiloxane to the polysilazane is 1-4:1; further preferably 2-3:1; further preferably 2.5:1.

[0120] In certain embodiments, the high temperature resistant insulating paint comprises the following raw material components in parts by weight: 0.2-0.8 parts of a silane coupling agent, 1-15 parts of a first organic solvent, and 100-260 parts of a first resin.

[0121] In certain embodiments, the high temperature resistant insulating paint comprises the following raw material components in parts by weight: 0.5-0.8 parts of a silane coupling agent, 6-10 parts of a first organic solvent, and 180-220 parts of a first resin.

[0122] In certain embodiments, the method for preparing the high temperature resistant insulating paint comprises the following steps: mixing a silane coupling agent with a first organic solvent, and then adding a first resin to react to obtain the high temperature resistant insulating paint.

[0123] In certain embodiments, the reaction conditions are: reaction temperature 50-60° C.; and / or reaction time 1-2 h.

[0124] In some embodiments, the viscosity of the high temperature resistant insulating varnish is adjusted to 60s-180s before use. Preferably, the viscosity of the high temperature resistant insulating varnish is adjusted using a first organic solvent.

[0125] In certain embodiments, the mixing method includes stirring and mixing, but is not limited thereto.

[0126] In some embodiments, the molecular sieve water vapor resistant layer 5 includes several layers of molecular sieve composite paint.

[0127] In some embodiments, the thickness of the molecular sieve water-resistant paint layer 5 is 0.05-0.30 mm; it can also be 0.05-0.15 mm, it can also be 0.15-0.3 mm, it can also be 0.1-0.2 mm, it can also be 0.06 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.14 mm, 0.16 mm, 0.18 mm, 0.2 mm, 0.25 mm, 0.3 mm.

[0128] In certain embodiments, the raw material components of the molecular sieve composite paint include: a structure directing agent, a dispersant, a second resin and a molecular sieve.

[0129] In certain embodiments, the structure directing agent includes one or more of tetrapropylammonium hydroxide, tetrapropylammonium bromide, tetraethylammonium hydroxide and tetrabutylammonium hydroxide. The structure directing agent of the molecular sieve is used to improve the internal microporous structure of the water vapor resistant layer of the molecular sieve and enhance the moisture resistance of the wire.

[0130] In certain embodiments, the structure directing agent is tetrapropylammonium hydroxide.

[0131] In certain embodiments, the raw material components of the molecular sieve composite paint include 1-5 parts of structure directing agent by weight; it can also be 2-3 parts, 4-5 parts, 2-4 parts, or 1.5, 2, 2.5, 3, 3.5, 4, or 4.5 parts.

[0132] In certain embodiments, the structure directing agent is in a solution state, and the solvent is water; wherein the concentration of the structure directing agent is 0.05-0.30 mol / L; it may also be 0.06-0.1 mol / L, 0.11-0.15 mol / L, 0.16-0.20 mol / L, 0.21-0.25 mol / L, 0.26-0.30 mol / L, 0.05-0.20 mol / L, 0.1-0.25 mol / L; it may also be 0.05 mol / L, 0.1 mol / L, 0.15 mol / L, 0.2 mol / L, 0.25 mol / L or 0.3 mol / L.

[0133] In certain embodiments, the dispersant includes an inorganic dispersant; wherein the dispersant is used to improve the uniformity of the molecular sieve composite paint, so that the molecular sieve can be evenly distributed in the composite paint, thereby avoiding the reduction of water-blocking function due to agglomeration of the molecular sieve.

[0134] In certain embodiments, the inorganic dispersant includes one or more of sodium silicate, sodium orthophosphate, sodium pyrophosphate, sodium tripolyphosphate and sodium polymetaphosphate.

[0135] In certain embodiments, the sodium polymetaphosphate includes sodium trimetaphosphate and / or sodium hexametaphosphate.

[0136] In some embodiments, the raw material components of the molecular sieve composite paint include 5-30 parts of dispersant by weight, or 6-10 parts, or 11-15 parts, or 16-20 parts, or 21-25 parts, or 26-30 parts, or 10-26 parts, or 15-25 parts; or 5, 10, 15, 20, 25, or 30 parts.

[0137] In certain embodiments, the dispersant is in a solution state, and the solvent is water, wherein the concentration of the dispersant solution is 0.1-3.0wt%; it can also be 0.1-1wt%, 1-2wt%, 2-3wt%, 0.2-0.8wt%, 0.5-2wt%, 0.2wt%, 0.4wt%, 0.5wt%, 0.8wt%, 1wt%, 1.2wt%, 1.4wt%.

[0138] In certain embodiments, the second resin includes one or more of epoxy resin, silicone resin, and silicone-modified polyester resin; preferably epoxy resin; wherein the second resin can enhance the adhesion of the molecular sieve composite paint and improve the film-forming property of the composite paint.

[0139] In some embodiments, the raw material components of the molecular sieve composite paint include 10-40 parts of the second resin by weight, or 11-15 parts, or 16-20 parts, or 21-25 parts, or 26-30 parts, or 31-35 parts, or 36-40 parts, or 20-30 parts; or 10, 15, 20, 25, 30, 35, or 40 parts.

[0140] In certain embodiments, the molecular sieve comprises one or more of 3A molecular sieve, 4A molecular sieve, 5A molecular sieve, 10X molecular sieve, 13X molecular sieve or ZSM-5 molecular sieve; wherein the molecular sieve is used to adsorb and isolate water vapor, improve the moisture resistance of the wire, and prevent the inner insulation from failing due to moisture.

[0141] In certain embodiments, the average particle size of the molecular sieve is 0.1-5.0 μm, or 0.5-1.5 μm, or 1.5-2 μm, or 2-3 μm, or 3-4 μm, or 4-5 μm, or 1-4 μm, or 0.3 μm, 0.5 μm, 0.7 μm, 1.0 μm, 2.0 μm, 3.5 μm, or 5.0 μm.

[0142] In some embodiments, the raw material components of the molecular sieve composite paint include 60-180 parts of molecular sieve by weight, or 60-80 parts, 80-100 parts, 100-120 parts, 120-140 parts, 150-160 parts, 170-180 parts, 70-160, 80-140, 90-130, 100-120, or 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180 parts.

[0143] In certain embodiments, the molecular sieve composite paint comprises the following raw material components by weight: 1-5 parts of a structure directing agent, 5-30 parts of a dispersant, 10-40 parts of a second resin and 60-180 parts of a molecular sieve; the concentration of the structure directing agent is 0.05-0.30 mol / L.

[0144] In certain embodiments, the molecular sieve composite paint comprises the following raw material components by weight: 2-4 parts of a structure directing agent, 15-25 parts of a dispersant, 20-30 parts of a second resin and 90-130 parts of a molecular sieve; the concentration of the structure directing agent is 0.05-0.2 mol / L.

[0145] In certain specific embodiments, the molecular sieve composite paint comprises the following raw material components by weight: 3 parts of a structure directing agent, 20 parts of a dispersant, 25 parts of a second resin and 110 parts of a molecular sieve; the concentration of the structure directing agent is 0.1 mol / L.

[0146] In certain embodiments, the method for preparing the molecular sieve composite paint comprises the following steps: uniformly mixing a structure directing agent and a molecular sieve, and then uniformly adding a dispersant and a second resin to obtain a molecular sieve composite paint.

[0147] In certain embodiments, the structure directing agent and the molecular sieve are uniformly mixed under stirring for 1-2 hours.

[0148] In certain embodiments, the dispersant and the second resin are mixed uniformly under stirring for 2-3 hours.

[0149] In some embodiments, the outer sheath 6 includes several layers of braided metal wires. Using braided metal wires with thinner wire diameters and better corrosion resistance as the protective layer can improve the mechanical properties of the wire and avoid mechanical damage.

[0150] In certain embodiments, the metal wire comprises one or more of a stainless steel wire, a nickel-plated copper wire, and a silver-plated copper wire.

[0151] In certain embodiments, the single filament diameter of the metal wire fiber is 0.03-0.15 mm, or 0.05-0.1 mm, or 0.08-0.12 mm, or 0.05 mm±0.01 mm, or 0.07 mm±0.01 mm, or 0.10 mm±0.01 mm, or 0.12 mm±0.01 mm.

[0152] In some embodiments, the thickness of the outer protective layer 6 is 0.1-1.0 mm; it can also be 0.1-0.5 mm, it can also be 0.5-1 mm, it can also be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm.

[0153] The second object of the present invention is to provide a method for preparing the above-mentioned wire, comprising the following steps:

[0154] 1) Preparation of the wire core: wrapping the conductor with fire-resistant mica tape and inorganic fiber in turn, and then coating it with high-temperature resistant insulating paint to form a wire core;

[0155] 2) coating the outer surface of the wire core with a molecular sieve composite paint; and then weaving metal wires as an outer sheath on the outermost layer to obtain the wire.

[0156] In certain embodiments, the method for preparing the conductor specifically includes: wrapping a refractory mica tape on the surface of the conductor, wrapping it with inorganic fibers on this basis, and then coating it with a high-temperature resistant insulating paint to form a high-temperature resistant insulating paint layer, and heating and drying it to form a wire core; coating the outside of the wire core with a molecular sieve composite paint and sintering it at a high temperature to form a molecular sieve composite paint layer, and using an outermost layer of braided metal wire as an outer sheath, and each layer of high-temperature resistant insulating paint or molecular sieve composite paint must be heated in a furnace.

[0157] In certain embodiments, the number of wrapped layers of the fire-resistant mica tape is 1-4 layers; it can also be 2-3 layers, or it can be 1, 2, 3, or 4 layers.

[0158] In certain embodiments, the number of inorganic fiber cladding layers is 1-6; it can also be 2-5, 3-4, or 1, 2, 3, 4, 5, or 6 layers.

[0159] In some embodiments, the high temperature resistant insulating paint is applied 3-6 times, 4-5 times, or 4 times.

[0160] In certain embodiments, the molecular sieve composite paint is coated 3-6 times, 4-5 times, or 4 times.

[0161] In some embodiments, a heating step is also included after each application of high temperature resistant insulating paint; wherein the heating temperature is 150-350°C; it can also be 150-250°C, it can also be 200-350°C, it can also be 200-300°C, it can also be 150°C, 200°C, 250°C, 300°C, 350°C.

[0162] In some embodiments, a heating step is further included after each application of the molecular sieve composite paint, wherein the heating temperature is 250-500°C, 250-330°C, 350-500°C, 300-400°C, 250°C, 300°C, 350°C, 400°C, 450°C, 500°C.

[0163] In certain embodiments, the heating includes, but is not limited to, oven heating.

[0164] In certain embodiments, the linear speed of the oven is 1.0-2.5 m / min; it can also be 1-1.5 m / min, it can also be 1.5-2 m / min; it can also be 1, 1.5, 2, 2.5 m / min.

[0165] The third object of the present invention is to protect the application of the above-mentioned wires in the fields of energy development, communications, medical treatment, steel, ships, aerospace, oil exploration, ocean exploration, metal smelting, transportation, signal transmission or power transmission.

[0166] The moisture-resistant and high-temperature-resistant wire of the present application has a heat resistance level of up to 600°C, and has greatly improved heat resistance compared with general high-temperature-resistant wires; the wire combines the specific adsorption of water vapor by nano-scale molecular sieves with the desorption characteristics under heating, and has the function of blocking water vapor in a high-humidity environment, and can be desorbed at high temperatures to remove residual water molecules, which can reduce insulation failure caused by water vapor penetration, and greatly improve reliability and service life; it can still maintain good insulation performance after high-frequency vibration, and can be used in high-temperature, high-humidity, and high-frequency vibration environments to improve the high-temperature resistance, moisture resistance, and vibration resistance of signal or power transmission wires.

[0167] The main performance indicators of the moisture-resistant and high-temperature-resistant wires of this application are as follows:

[0168] a) Breakdown voltage: ≥4000V at room temperature;

[0169] b) Insulation resistance: ≥1.0×10 at room temperature 11 Ω·m;

[0170] c) High temperature resistance: In high temperature (600℃) environment, insulation resistance ≥5×10 7 Ω·m;

[0171] d) Water resistance: After immersion in water for 2 hours, no breakdown at 2500V; after immersion in water for 2 hours at high temperature (600℃, 24h), no breakdown at 1500V;

[0172] e) Moisture resistance: After moisture aging (50℃, 95% RH, 48h), insulation resistance ≥5×10 7 Ω·m;

[0173] f) It can be used in high temperature environment, humid environment and vibration environment.

[0174] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0175] Before further describing the specific embodiments of the present invention, it should be understood that the scope of protection of the present invention is not limited to the specific embodiments described below; it should also be understood that the terms used in the examples of the present invention are intended to describe specific embodiments rather than to limit the scope of protection of the present invention. The test methods in the following examples without specifying specific conditions are generally carried out under conventional conditions or under conditions recommended by the manufacturers.

[0176] When the embodiments give numerical ranges, it should be understood that, unless otherwise specified in the present invention, the two endpoints of each numerical range and any numerical value between the two endpoints can 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 grasp of the prior art by those skilled in the art and the record 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 can also be used to realize the present invention.

[0177] Example 1

[0178] This embodiment provides a specific moisture-resistant and high-temperature-resistant wire, and the preparation method is as follows:

[0179] A nickel-plated copper strand with a size of 19*0.20mm is selected as the conductor, and two layers of calcined gold mica tape with a width of 5mm and a thickness of 0.1mm are used to wrap the conductor surface, and the thickness of the mica insulation layer is 0.5mm; then 8 ingots of alumina fiber with a single wire diameter of 8-10μm and a weight content of 72% alumina are used for paralleling, and 3 layers of alumina fiber are wrapped around the mica layer, and the thickness of the inorganic fiber insulation layer is 0.35mm; then 4 layers of high-temperature resistant insulating paint are applied on the surface, and each layer of high-temperature resistant insulating paint needs to be passed through The wire core is formed by heating and drying in a drying furnace at a heating temperature of 330°C, and the thickness of the high-temperature resistant insulating paint layer is 0.06mm; the outside of the wire core is coated with 4 layers of molecular sieve composite paint using 3A molecular sieve, and each layer of molecular sieve composite paint needs to be passed through a drying furnace at a heating temperature of 400°C and high-temperature sintering after coating, and the thickness of the molecular sieve water vapor resistant layer is 0.12mm; the outermost layer uses 24 spindles of nickel-plated copper wire with a single wire diameter of 0.1mm as the outer sheath, the thickness of the outer sheath is 0.2mm, and the line speed is 0.8m / min.

[0180] The high temperature resistant insulating paint in this embodiment includes the following components and weight parts: 0.6 weight parts of methyltriethoxysilane coupling agent, 8 weight parts of xylene and 195 weight parts of polysiloxane and polysilazane resin; wherein the polysiloxane and polysilazane resin is a composition of ethoxyphenyl polysiloxane resin and phenyl polysilazane resin, and the mass ratio is 2.5:1.

[0181] The high temperature resistant insulating paint in this embodiment is prepared by a method comprising the following steps: dispersing 0.6 parts by weight of a silane coupling agent in 8 parts by weight of xylene, mixing evenly, adding 195 parts by weight of a polysiloxane and polysilazane composition, mixing in a reaction kettle, heating and heating, mechanically stirring, heating to (55±5)°C, and mechanically stirring for 1 to 2 hours to obtain a high temperature resistant insulating paint; the viscosity of the high temperature resistant insulating paint is adjusted to 60s-180s (23±1°C, No. 4 cup method) with xylene before use.

[0182] The molecular sieve composite paint in this embodiment includes the following components and weight portions: 3 weight portions of a 0.1 mol / L tetrapropylammonium hydroxide aqueous solution, 20 weight portions of a 0.5 wt% sodium hexametaphosphate dispersant aqueous solution, 25 weight portions of an epoxy resin and 110 weight portions of a molecular sieve; the molecular sieve is a type 3A molecular sieve, and the average particle size of the molecular sieve is 0.5-0.7 μm.

[0183] The molecular sieve composite paint in this embodiment is prepared by a method comprising the following steps: 3 parts by weight of tetrapropylammonium hydroxide aqueous solution and 110 parts by weight of molecular sieve are evenly mixed, mechanically stirred for 1 to 2 hours, and then mixed with 20 parts by weight of sodium hexametaphosphate dispersant aqueous solution and 25 parts by weight of epoxy resin in a reactor, and stirred for 2 to 3 hours until the liquid is evenly mixed.

[0184] Example 2

[0185] The present embodiment provides a specific moisture-resistant and high-temperature resistant conductor, which is different from Embodiment 1 only in that 3 layers of 5 mm wide and 0.08 mm thick calcined gold mica tape are wrapped around the conductor surface, 12 ingots of alumina fiber with a single filament diameter of 3-6 μm and an alumina weight content of 72% are wrapped around the mica surface, and 5 layers of high-temperature resistant insulating paint are applied. After each layer of high-temperature resistant insulating paint is applied, it needs to pass through a baking furnace with a heating temperature of 350°C, and after each layer of molecular sieve composite paint is applied, it needs to pass through a baking furnace with a heating temperature of 420°C, and the line speed is 1.0 m / min.

[0186] The molecular sieve in this embodiment is a combination of 3A molecular sieve and ZSM-5 molecular sieve, with a mass ratio of 3:1. The average particle size of the molecular sieve is 0.3-0.6 μm.

[0187] Example 3

[0188] This embodiment provides a specific moisture-resistant and high-temperature resistant conductor, which is different from Embodiment 1 only in that uncalcined phlogopite tape, alumina fibers with a single filament diameter of 14 μm to 16 μm and an alumina weight content of 72%, and 5A molecular sieve are used.

[0189] Example 4

[0190] This embodiment provides a specific moisture-resistant and high-temperature resistant wire, which is different from Example 1 only in that: the polysiloxane and polysilazane composition in the high-temperature resistant insulating paint is 130 parts by weight, the sodium hexametaphosphate dispersant aqueous solution in the molecular sieve composite paint is 20 parts by weight, the epoxy resin is 15 parts by weight, and the molecular sieve is 95 parts by weight.

[0191] Comparative Example 1

[0192] This comparative example is a comparative example of Example 1, except that no molecular sieve water vapor resistant layer is used.

[0193] Comparative Example 2

[0194] This comparative example is a comparative example of Example 1, except that the inorganic fiber wrapping layer and outer protective layer are not used.

[0195] Comparative Example 3

[0196] This comparative example is a comparative example of Example 1, except that no outer protective layer is used.

[0197] Effect example

[0198] The moisture-resistant and high-temperature-resistant wires prepared in Examples 1 to 3 and Comparative Examples 1 to 2 were subjected to the following effect tests: insulation resistance, breakdown voltage, and withstand voltage performance in water. The test results are shown in Table 1. The test method is as follows:

[0199] (1) Insulation resistance:

[0200] At room temperature: test the insulation resistance of the wire;

[0201] High temperature aging: Heat the wire at 600℃ for 2h and 24h, and then test its insulation resistance;

[0202] Damp heat aging: Place the wire in a 50°C, 95% RH environment for 48 hours, then test its insulation resistance;

[0203] After vibration test: After the wire is subjected to vibration test according to the engine vibration environment in GJB 150.16A-2009, its insulation resistance is tested;

[0204] The insulation resistance adopts the voltage-current method in GB / T 3048.5-2007 "Electrical performance test methods for wires and cables Part 5: Insulation resistance test".

[0205] (2) Breakdown voltage: GB / T 4074.5-2008.

[0206] (3) Water resistance:

[0207] At room temperature: Place the wire in water and immerse it for 2 hours to test its voltage resistance in water. The test voltage is 2500V / AC.

[0208] Under high temperature: heat the wire at 600℃ for 24h, place it in water for 2h, and test its voltage resistance performance. The test voltage is 1500V / AC.

[0209] Table 1

[0210]

[0211]

[0212] It can be seen from Table 1 that the heat resistance level of the wires prepared in Examples 1-4 can reach 600° C. The wires have the function of blocking water vapor in a high humidity and heat environment, which can reduce the insulation failure caused by water vapor penetration, and can still maintain good insulation performance after high-frequency vibration; while the insulation performance of the wires in Comparative Examples 1-3 is significantly reduced because they do not use a molecular sieve water vapor resistant layer, an inorganic fiber winding layer or an outer protective layer.

[0213] 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 familiar with 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 a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A conductor, characterized in that: The wire comprises a conductor and a mica insulating layer, an inorganic fiber insulating layer, a high temperature resistant insulating paint layer, a molecular sieve water vapor resistant layer and an outer protective layer which are sequentially coated on the conductor from the inside to the outside.

2. The wire according to claim 1, characterized in that: The conductor is a nickel-plated conductor or a nickel-clad copper conductor; Preferably, the thickness of the mica insulation layer is 0.1-4.0 mm; Preferably, the thickness of the inorganic fiber insulation layer is 0.07-1.50 mm; Preferably, the thickness of the high temperature resistant insulating paint layer is 0.01-0.20 mm; Preferably, the thickness of the molecular sieve water vapor resistant layer is 0.05-0.30 mm; Preferably, the thickness of the outer protective layer is 0.1-1.0 mm.

3. The wire according to claim 1, characterized in that: The mica insulation layer includes several layers of mica tapes; Preferably, the mica tape includes one or more of phlogopite tape, muscovite tape, synthetic mica tape, calcined muscovite tape and calcined phlogopite tape; Preferably, the inorganic fiber insulation layer comprises several layers of inorganic fibers; Preferably, the inorganic fiber includes one or more of alumina fiber, mullite fiber, silicon carbide fiber, zirconia fiber, basalt fiber, glass fiber and quartz fiber; Preferably, the outer sheath comprises several layers of braided metal wires; Preferably, the metal wire includes one or more of stainless steel wire, nickel-plated copper wire and silver-plated copper wire.

4. The wire according to claim 1, characterized in that: The high temperature resistant insulating paint layer comprises several layers of high temperature resistant insulating paint; Preferably, the high temperature resistant insulating paint comprises the following raw material components: a silane coupling agent, a first organic solvent and a first resin; Preferably, the high temperature resistant insulating paint comprises the following raw material components by weight: 0.2-0.8 parts of a silane coupling agent, 1-10 parts of a first organic solvent and 100-260 parts of a first resin.

5. The wire according to claim 4, characterized in that: The silane coupling agent includes one or more of tetramethoxysilane, tetraethoxysilane, methyltriethoxysilane and aminopropyltriethoxysilane; Preferably, the first organic solvent includes one or more of toluene, xylene, ethyl acetate, and methyl isobutyl ketone; Preferably, the first resin comprises one or both of polysiloxane and polysilazane resins; Preferably, the polysiloxane includes one or more of methyl polysiloxane resin, methyl phenyl polysiloxane resin, ethoxy polysiloxane resin, methyl ethoxy polysiloxane silicone resin and ethoxy phenyl polysiloxane resin; Preferably, the polysilazane includes one or more of methyl polysilazane resin, perhydropolysilazane resin and phenyl polysilazane resin.

6. The wire according to claim 1, characterized in that: The molecular sieve water vapor resistant layer comprises several layers of molecular sieve composite paint; Preferably, the molecular sieve composite paint comprises the following raw material components: a structure directing agent, a dispersant, a second resin and a molecular sieve; Preferably, the molecular sieve composite paint comprises the following raw material components by weight: 1-5 parts of a structure directing agent, 5-30 parts of a dispersant, 10-40 parts of a second resin, and 60-180 parts of a molecular sieve; the concentration of the structure directing agent is preferably 0.05-0.30 mol / L; the concentration of the dispersant is preferably 0.1-3.0 wt%.

7. The guide wire according to claim 6, characterized in that: The structure directing agent includes one or more of tetrapropylammonium hydroxide, tetrapropylammonium bromide, tetraethylammonium hydroxide and tetrabutylammonium hydroxide; Preferably, the dispersant is an inorganic dispersant; the inorganic dispersant preferably includes one or more of sodium silicate, sodium orthophosphate, sodium pyrophosphate, sodium tripolyphosphate and sodium polymetaphosphate; Preferably, the second resin includes one or more of epoxy resin, silicone resin, and silicone-modified polyester resin; Preferably, the molecular sieve includes one or more of 3A molecular sieve, 4A molecular sieve, 5A molecular sieve, 10X molecular sieve, 13X molecular sieve and ZSM-5 molecular sieve; Preferably, the average particle size of the molecular sieve is 0.1-5.0 μm; Preferably, the method for preparing the molecular sieve composite paint comprises the following steps: uniformly mixing the structure directing agent and the molecular sieve, and then adding the dispersant and the second resin and mixing them uniformly to obtain the molecular sieve composite paint.

8. The method for preparing the wire according to any one of claims 1 to 7, comprising the following steps: 1) Preparation of wire core: wrapping the conductor with mica tape and inorganic fiber in turn, and then coating it with high temperature resistant insulating paint to form a wire core; 2) coating the outer surface of the wire core with a molecular sieve composite paint; and then weaving metal wires as an outer sheath on the outermost layer to obtain the wire.

9. The preparation method according to claim 8, characterized in that: The number of wrapped layers of the mica tape is 1-4; Preferably, the number of burnt layers of the inorganic fiber is 1-6; Preferably, the high temperature resistant insulating paint is applied 3-6 times; Preferably, the molecular sieve composite paint is applied 3-6 times; Preferably, each time the high temperature resistant insulating paint is applied, a heating step is also included; wherein the heating temperature is 150-350°C; Preferably, a heating step is further included after each coating of the molecular sieve composite paint; wherein the heating temperature is 250-500°C.

10. Application of the wire according to any one of claims 1 to 7 in the field of energy development, communication, medical treatment, steel, shipbuilding, aerospace, oil exploration, ocean exploration, metal smelting, transportation, signal transmission or power transmission.

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