High-temperature-resistant anti-interference cable

Abstract

The invention relates to a high-temperature-resistant anti-interference cable, and belongs to the technical field of cables. The cable is composed of a conductor layer, a high-thermal-conductivity inner insulating layer, a phase change buffer layer, an electromagnetic shielding layer and a ceramic outer sheath which are sequentially and coaxially arranged. The high-thermal-conductivity inner insulating layer is composed of base resin, boron nitride nanosheets, carboxylated graphene and the like; the electromagnetic shielding layer is composed of a silver-plated copper woven mesh and conductive slurry containing magnetic filler; the phase change buffer layer is composed of PCM microcapsules, fluorinated silicone rubber and AlO; the ceramic outer sheath is composed of ceramic precursor silicone rubber, potassium titanate whiskers and hyperbranched PI. The cable provided by the invention has excellent high temperature resistance and electromagnetic interference protection capability, and is suitable for power transmission and signal transmission in high temperature and strong electromagnetic interference environments.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a high-temperature-resistant and anti-interference cable. BACKGROUND

[0002] With the continuous development of technology, as an important carrier for power and signal transmission, the performance requirements of cables are becoming higher and higher. Especially in extreme working conditions such as high temperature, strong electromagnetic interference, etc., higher requirements are put forward for the high-temperature resistance and anti-interference ability of cables.

[0003] At present, the common high-temperature-resistant cables on the market mainly use organic high-molecular materials as the insulation layer, such as polyolefin, fluoroplastic and other materials. For example, CN115521527B discloses a radiation-resistant high-flexibility anti-interference measuring cable, whose inner insulation layer uses radiation-resistant low-smoke halogen-free polyolefin insulation material, including high-density polyethylene, maleic anhydride grafted POE, modified phenolic resin containing SiC, etc. This cable has certain radiation resistance and anti-interference ability, but its insulation performance will decrease significantly at a temperature above 300℃.

[0004] In terms of anti-interference, CN111029031A discloses an anti-interference high-flame-retardant environmentally friendly transponder data transmission cable, which adopts a double-composite high-electromagnetic shielding layer to form a three-level shielding, improving the anti-interference ability of the cable. However, the shielding layer structure of this cable is complex, the weight is large, and there is a problem of narrow frequency band in high-frequency signal transmission, which is difficult to meet the wideband application demand.

[0005] For high-temperature resistance, CN109767866A discloses a ceramicized fireproof high-temperature-resistant cable, which introduces a high-temperature-resistant layer and a graphene coating into the cable structure, improving the high-temperature resistance of the cable. However, this cable has the problem of high brittleness after ceramicization, and the bending radius is limited, which makes it difficult to use in narrow spaces or occasions requiring frequent bending.

[0006] In terms of cable outer sheath, CN119581118A discloses a high-flexibility low-smoke fireproof power cable, whose outer sheath layer is composed of methyl vinyl silicone rubber, ternary ethylene propylene rubber and other materials, having excellent mechanical strength and flame retardant performance. However, the long-term use performance of this cable in extreme high-temperature environments still needs to be improved.

[0007] In terms of heat-conductive insulation materials, CN114479220A discloses a high-heat-conductive insulation material for electric vehicle fast-charging cables based on nano-modification. Although this material has certain heat conductivity and insulation, it is difficult to achieve both heat conductivity and insulation in high-temperature environments, and cannot meet the use requirements in extreme working conditions.

[0008] In summary, the high-temperature-resistant cable in the prior art mainly has the following problems:

[0009] 1. High thermal conductivity and high insulation performance are difficult to achieve. Traditional cable materials often lead to a decrease in insulation performance while improving thermal conductivity, especially in high-temperature environments, and this contradiction is more prominent.

[0010] 2. High brittleness after ceramicization, limited bending radius. The existing ceramic cable can maintain certain insulation performance at high temperatures, but the material becomes brittle after ceramicization, with poor bending performance, limiting its application in complex environments.

[0011] 3. Heavy weight and narrow frequency band of electromagnetic shielding layer. Traditional electromagnetic shielding structures usually use metal mesh or metal foil, which is heavy and has a narrow frequency band when transmitting high-frequency signals, making it difficult to meet the requirements of wide-band applications.

[0012] 4. In extreme working conditions (-60℃ to 300℃), existing cables are difficult to meet the requirements of high-power transmission, high insulation performance, and anti-interference ability, limiting their application in special fields such as aerospace and military.

[0013] Therefore, it is urgent to develop a cable that can maintain excellent thermal conductivity, insulation, and anti-interference ability in extreme temperature environments to meet the high-performance requirements in special working conditions. SUMMARY

[0014] To solve the technical problems of the existing high-temperature-resistant cable, such as the difficulty in achieving high thermal conductivity and high insulation, the brittleness after ceramicization leading to limited bending radius, and the heavy weight and narrow frequency band of the shielding layer, and to improve the performance and application range of high-power transmission cables in extreme working conditions (-60℃ to 300℃), the present application provides a high-temperature-resistant anti-interference cable.

[0015] The purpose of the present application is achieved by the following technical solution: a high-temperature-resistant anti-interference cable, which is coaxially composed of a conductor layer, a high-thermal-conductivity inner insulation layer, a phase change buffer layer, an electromagnetic shielding layer, and a ceramic outer sheath; the high-thermal-conductivity inner insulation layer is made of a high-thermal-conductivity insulation material, which includes the following raw materials by weight: 40-50 parts of base resin, 10-15 parts of boron nitride nanosheet, 3-5 parts of carboxylated graphene, 0.8-1.2 parts of aluminate coupling agent, 3-7 parts of 4,4'-diaminodiphenyl sulfone, 0.1-0.3 parts of accelerator, 0.3-0.7 parts of antioxidant, and 15-25 parts of solvent.

[0016] Preferably, the base resin is bisphenol A type epoxy resin with an epoxy equivalent weight of 180-190 g / eq.

[0017] Preferably, the accelerator is at least one of 2-ethyl-4-methylimidazole, DMP-30 accelerator, EMI-24 accelerator.

[0018] Preferably, the antioxidant is composed of antioxidant 1010 and antioxidant 168 at a mass ratio of 1:0.8-1.2.

[0019] Preferably, the solvent is at least one of diethylene glycol dimethyl ether, propylene glycol methyl ether acetate, gamma-butyrolactone and propylene carbonate.

[0020] Preferably, the high-thermal-conductivity insulation material is prepared by the following method:

[0021] A1, mix boron nitride and KH-550 at a volume ratio of 2:0.01-0.03, add to an appropriate amount of ethanol solution, ball mill at a speed of 400 rpm for 1-3 h, vacuum dry at 75-85℃, obtain boron nitride nanosheets, and reserve;

[0022] A2, mix graphene and concentrated HNO3 / H2SO4 at a volume ratio of 1:2-3, heat to 60-65℃ and reflux for 2-5 h, wash with deionized water until neutral, freeze-dry, obtain carboxylated graphene, and reserve;

[0023] A3, according to weight parts, add boron nitride nanosheets, carboxylated graphene and aluminate coupling agent to the solvent, ultrasonic treat for 20-40 min, obtain uniform slurry;

[0024] A4, according to weight parts, mix base resin, 4,4'-diamino diphenyl sulfone, accelerator, antioxidant with the slurry uniformly, vacuum degassing, then pour into a mold, control the temperature at 100-150℃ and cure for 1-3 h, obtain high-thermal-conductivity insulation material.

[0025] Preferably, the electromagnetic shielding layer is composed of silver-plated copper braid and conductive slurry, the conductive slurry includes the following raw materials by weight parts: pretreated magnetic filler 15-20 parts, carboxylated graphene 10-12 parts, bonding matrix 25-35 parts, 3,3'-diamino diphenyl sulfone 4-8 parts, gamma-methacryloxypropyl trimethoxysilane 1.0-1.5 parts, methyl isobutyl ketone 3-7 parts.

[0026] Preferably, the electromagnetic shielding layer is prepared by the following method:

[0027] F1, mix nickel-coated iron powder and gamma-methacryloxypropyl trimethoxysilane at a mass ratio of 1.5:0.01-0.03, add to an appropriate amount of ethanol solution, ball mill at a speed of 300 rpm for 1-3 h, vacuum dry at 75-85℃, obtain pretreated magnetic filler, and reserve;

[0028] F2, according to parts by weight, the carboxylated graphene, pretreated magnetic filler, bonding matrix, methyl isobutyl ketone and 3,3'-diamino diphenyl sulfone are mixed, and then ultrasonic treatment is carried out at a power of 500 W for 15-25 min to obtain a conductive slurry;

[0029] F3, the silver-plated copper braid is immersed in the conductive slurry, and is scraped and coated to a thickness of 0.2-0.3 mm, and curing treatment is carried out at a curing temperature of 120-160 DEG C for 1-2 h to obtain an electromagnetic shielding layer.

[0030] Preferably, the phase change buffer layer is composed of PCM microcapsules (melting point 245 DEG C) 25-30%, fluorosilicone rubber 55-60% and Al2O3 10-15%.

[0031] Preferably, the ceramic outer sheath is composed of ceramic precursor silicone rubber 70-75%, potassium titanate whisker 15-20% and hyperbranched PI 5-8%.

[0032] The application also provides a preparation method of the high-temperature-resistant anti-interference cable.

[0033] The application has the following advantages:

[0034] 1. The application realizes the compatibility of high thermal conductivity and high insulation performance by adopting the "five-layer gradient functional structure + ceramicization synergy + electromagnetic shielding-thermal conductivity-fire-resistant integration" design. -1 K -1 The breakdown strength is as high as 36 kV / mm, effectively solving the problem that high thermal conductivity and high insulation are difficult to be compatible in the prior art.

[0035] 2. The electromagnetic shielding layer of the application adopts the electromagnetic double-loss mechanism of the carboxylated graphene conductive network and the nickel-coated iron magnetic network, so that the cable has an electrical conductivity of 1.2*10 5 S / m or more, a shielding effectiveness of 97-100 dB (10 kHz-3 GHz), and a density of <2.1 g / cm 3 .

[0036] 3. The present application realizes "soft-rigid" reversible conversion by delaying temperature rise at 245℃ through PCM microcapsules in the phase change buffer layer and forming Si-O-Al ceramic shell layer through instant sintering of ceramic precursor at >300℃, and solves the problem of brittleness and limited bending radius after ceramization in the prior art.

[0037] 4. The present application adopts coaxial five-layer one-time extrusion process, solves the problem of interfacial debonding through gradient mold temperature and online vulcanization, realizes industrial continuous production, and improves high-frequency transmission efficiency by >15%.

[0038] 5. The present application realizes "light-soft-strong-resistant-screen" integration, so that the cable is suitable for high-power transmission in extreme working conditions (-60℃-300℃), and significantly expands the application range of high-temperature resistant cables. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of those skilled in the art, the present application will be further described below in conjunction with examples, and the content mentioned in the embodiments is not a limitation of the present application.

[0040] Example 1

[0041] A high-temperature resistant anti-interference cable is coaxially composed of a conductor layer, a high-thermal-conductivity inner insulation layer, a phase change buffer layer, an electromagnetic shielding layer and a ceramized outer sheath.

[0042] The conductor layer is located in the innermost layer of the cable and is used for transmitting electrical signals.

[0043] The high-thermal-conductivity inner insulation layer is wrapped around the conductor layer and is made of high-thermal-conductivity insulation material. The high-thermal-conductivity insulation material comprises the following raw materials in parts by weight: base resin 45 parts, boron nitride nanosheet 12 parts, carboxylated graphene 4 parts, aluminic ester coupling agent 1 part, 4,4'-diamino diphenyl sulfone 5 parts, accelerator 0.2 parts, antioxidant 0.5 parts, and solvent 20 parts. The base resin is bisphenol A type epoxy resin with an epoxy equivalent weight of 185 g / eq. The accelerator is 2-ethyl-4-methylimidazole. The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1. The solvent is diethylene glycol dimethyl ether. The high-thermal-conductivity inner insulation layer can quickly conduct the heat generated by the conductor layer during operation to prevent the conductor from overheating and being damaged.

[0044] The high-thermal-conductivity insulation material is prepared by the following method:

[0045] A1, mix boron nitride and KH-550 according to a volume ratio of 2:0.02, add to an appropriate amount of ethanol solution, ball mill at a speed of 400 rpm for 2 h, and vacuum dry at 80℃ to obtain boron nitride nanosheet, which is ready for use;

[0046] A2, graphene was mixed with concentrated HNO3 / H2SO4 in a volume ratio of 1:2.5, heated to 62°C and refluxed for 3h, washed with deionized water until neutral, and freeze-dried to obtain carboxylated graphene, which was used as a raw material;

[0047] A3, according to the weight parts, boron nitride nanosheets, carboxylated graphene, aluminate coupling agent were added to the solvent, and ultrasonic treatment was carried out for 30 min to obtain a uniform slurry;

[0048] A4, according to the weight parts, the base resin, 4,4'-diamino diphenyl sulfone, accelerator, antioxidant and slurry were mixed uniformly, vacuum degassing was carried out, then the mold was poured, the temperature was controlled at 120°C and cured for 2h to obtain a high-thermal-conductivity insulating material.

[0049] The phase change buffer layer is located on the periphery of the high-thermal-conductivity inner insulating layer and is composed of 28% PCM microcapsules (melting point 245°C), 58% fluorosilicone rubber and 14% Al2O3. The phase change buffer layer undergoes a phase change when the temperature reaches 245°C, absorbing a large amount of heat and playing a role in buffering high-temperature impact, thereby protecting the internal conductor and insulating layer.

[0050] The electromagnetic shielding layer is located on the periphery of the phase change buffer layer and is composed of silver-plated copper woven mesh and conductive slurry. The conductive slurry includes the following raw materials in weight parts: pretreated magnetic filler 18 parts, carboxylated graphene 11 parts, bonding matrix 30 parts, 3,3'-diamino diphenyl sulfone 6 parts, γ-methacryloxypropyl trimethoxysilane 1.2 parts, methyl isobutyl ketone 5 parts.

[0051] The electromagnetic shielding layer is prepared by the following method:

[0052] F1, the nickel-coated iron powder and γ-methacryloxypropyl trimethoxysilane were mixed in a mass ratio of 1.5:0.02, then added to an appropriate amount of ethanol solution, ball milled at a speed of 300 rpm for 2h, and vacuum dried at 80°C to obtain a pretreated magnetic filler, which was used as a raw material;

[0053] F2, according to the weight parts, carboxylated graphene, pretreated magnetic filler, bonding matrix, methyl isobutyl ketone and 3,3'-diamino diphenyl sulfone were mixed, and ultrasonic treatment was carried out at a power of 500W for 20min to obtain a conductive slurry;

[0054] F3, the silver-plated copper woven mesh was immersed in the conductive slurry, and was scraped to a thickness of 0.25mm, and the curing temperature was controlled at 140°C for curing treatment for 1.5h to obtain an electromagnetic shielding layer. The electromagnetic shielding layer can effectively block external electromagnetic interference, ensuring the stability and reliability of signal transmission.

[0055] The ceramic outer sheath is located at the outermost layer of the cable and is composed of 75% of ceramic precursor silicone rubber (second-generation microcrystalline ceramic silicone rubber product provided by Fuchengwei Technology Co., Ltd.), 18% of potassium titanate whisker, and 7% of hyperbranched PI (amino-terminated hyperbranched polyamide provided by Qingdao Haigu).

[0056] In a preferred embodiment, the accelerator can be selected from DMP-30 accelerator or EMI-24 accelerator.

[0057] In a preferred embodiment, the solvent can be selected from propylene glycol methyl ether acetate, gamma-butyrolactone, or propylene carbonate.

[0058] The high-temperature-resistant and anti-interference cable has a reasonable structure design, and the functional layers work cooperatively, so that the cable has excellent high-temperature resistance and anti-electromagnetic interference capability. The boron nitride nanosheet and the carboxylated graphene in the high-thermal-conductivity inner insulation layer provide a high-thermal-conductivity channel, effectively dissipating the heat generated by the conductor; the phase change buffer layer can absorb a large amount of heat when the temperature rises suddenly; the silver-plated copper braid and the conductive paste in the electromagnetic shielding layer form a double shielding structure, effectively blocking external electromagnetic interference; and the ceramic outer sheath forms a ceramic protective layer at high temperature, providing outermost protection for the entire cable. The cable is particularly suitable for signal transmission in high-temperature and strong electromagnetic interference environments, such as aerospace, metallurgy, and petrochemical fields.

[0059] The high-thermal-conductivity inner insulation layer prepared in the embodiment was subjected to performance testing, and the results are shown in Table 1.

[0060] Table 1

[0061]

[0062]

[0063] The electromagnetic shielding layer prepared in the embodiment was subjected to performance testing, and the results are shown in Table 2.

[0064] Table 2

[0065]

[0066] The overall cable prepared in the embodiment was subjected to fire resistance level and long-time aging testing, and the results are shown in Table 3.

[0067] Table 3

[0068]

[0069] From the above test, the cable prepared by the technical scheme in the application has good comprehensive performance, and is particularly suitable for signal transmission in high-temperature and strong electromagnetic interference environments, such as aerospace, metallurgy, petrochemical industry and the like.

[0070] Example Two

[0071] A preparation method of a high-temperature-resistant and anti-interference cable, which comprises the following steps: adopting a five-head coaxial extruder to co-extrude materials for a conductor layer, a high-heat-conducting inner insulation layer, a phase change buffer layer, an electromagnetic shielding layer and a ceramicized outer sheath, and then performing vacuum sizing, infrared-hot air coupling vulcanization, water cooling, traction and plasma surface treatment in sequence, and finally winding to obtain the high-temperature-resistant and anti-interference cable.

[0072] In the method, head ① of the five-head coaxial extruder is used for preheating and guiding the conductor, head ② is used for extruding the high-heat-conducting insulation material, head ③ is used for extruding the phase change buffer layer material, head ④ is used for extruding the electromagnetic shielding layer material, and head ⑤ is used for extruding the ceramicized outer sheath.

[0073] In the preparation method, the high-temperature-resistant and anti-interference cable is coaxially composed of the conductor layer, the high-heat-conducting inner insulation layer, the phase change buffer layer, the electromagnetic shielding layer and the ceramicized outer sheath, and the material compositions of the layers are the same as those in Example One.

[0074] The specific preparation steps are as follows:

[0075] Step One: Material Preparation

[0076] The high-heat-conducting inner insulation layer material, the phase change buffer layer material, the electromagnetic shielding layer material and the ceramicized outer sheath material are prepared according to the method described in Example One.

[0077] Step Two: Extrusion Molding

[0078] The prepared materials of the layers are respectively loaded into the corresponding heads of the five-head coaxial extruder, the conductor is preheated and guided through head ①, the high-heat-conducting insulation material is extruded through head ② to coat the outer layer of the conductor, the phase change buffer layer material is extruded through head ③ to coat the outer layer of the high-heat-conducting inner insulation layer, the electromagnetic shielding layer material is extruded through head ④ to coat the outer layer of the phase change buffer layer, and the ceramicized outer sheath material is extruded through head ⑤ to coat the outer layer of the electromagnetic shielding layer.

[0079] Step Three: Vacuum Sizing

[0080] The extruded cable is subjected to sizing treatment in a vacuum environment through a vacuum sizing device, so as to ensure that the structure size of the cable is stable and the concentricity is good.

[0081] Step Four: Infrared-Hot Air Coupling Vulcanization

[0082] The sized cable is passed through an infrared-heat air coupling vulcanization device, which uses the dual action of infrared radiation and hot air to vulcanize the cable, allowing the materials in each layer to fully crosslink and cure, thereby improving the mechanical strength and heat resistance of the cable.

[0083] Step five: water cooling treatment

[0084] The vulcanized cable is cooled by a water cooling device to rapidly reduce the temperature of the cable and solidify the structure.

[0085] Step six: traction

[0086] The cooled cable is pulled by a traction device to control the linear speed and tension of the cable, ensuring uniformity in the size of the cable.

[0087] Step seven: plasma surface treatment

[0088] The pulled cable is passed through a plasma surface treatment device to activate the surface of the cable, improving the surface adhesion and wear resistance.

[0089] Step eight: winding

[0090] The surface-treated cable is wound by a winding device to complete the preparation of the high-temperature-resistant and anti-interference cable.

[0091] Through the above preparation method, the high-temperature-resistant and anti-interference cable prepared has a tightly combined structure, good concentricity, uniform cross-section, excellent high-temperature resistance, and excellent anti-electromagnetic interference capability. The cable can maintain structural integrity in a high-temperature environment above 600℃, effectively block external electromagnetic interference, and ensure the stability and reliability of signal transmission, making it particularly suitable for signal transmission in high-temperature and strong electromagnetic interference environments such as aerospace, metallurgy, and petrochemical industries.

[0092] Example three

[0093] A high-temperature-resistant and anti-interference cable, which is coaxially composed of a conductor layer, a high-thermal-conductivity inner insulation layer, a phase change buffer layer, an electromagnetic shielding layer, and a ceramicized outer sheath; the high-thermal-conductivity inner insulation layer is made of a high-thermal-conductivity insulation material, which comprises the following raw materials by weight: 40 parts of base resin, 10 parts of boron nitride nanosheet, 3 parts of carboxylated graphene, 0.8 parts of aluminate coupling agent, 3 parts of 4,4'-diaminodiphenyl sulfone, 0.1 parts of accelerator, 0.3 parts of antioxidant, and 15 parts of solvent; the phase change buffer layer is composed of 25% of PCM microcapsules (melting point 245℃), 60% of fluorosilicone rubber, and 15% of Al2O3; and the ceramicized outer sheath is composed of 72% of ceramic precursor silicone rubber, 20% of potassium titanate whisker, and 8% of hyperbranched PI.

[0094] The base resin is bisphenol A type epoxy resin with an epoxy equivalent weight of 180 g / eq.

[0095] The accelerator is 2-ethyl-4-methylimidazole.

[0096] The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:0.8.

[0097] The solvent is diethylene glycol dimethyl ether.

[0098] The high-thermal-conductivity insulating material is prepared by the following method:

[0099] A1, mixing boron nitride and KH-550 in a volume ratio of 2:0.01, adding to an appropriate amount of ethanol solution, ball milling at a speed of 400 rpm for 1 h, vacuum drying at 75°C, obtaining boron nitride nanosheets, ready for use;

[0100] A2, mixing graphene and concentrated HNO3 / H2SO4 in a volume ratio of 1:2, heating to 60°C and refluxing for 2 h, washing with deionized water until neutral, freeze-drying, obtaining carboxylated graphene, ready for use;

[0101] A3, according to weight parts, boron nitride nanosheets, carboxylated graphene, aluminate coupling agent are added to the solvent, ultrasonic treatment for 20 min, obtaining a uniform slurry;

[0102] A4, according to weight parts, the base resin, 4,4'-diamino diphenyl sulfone, accelerator, antioxidant and slurry are mixed uniformly, vacuum degassing, then pouring into a mold, controlling the temperature at 100°C for 1 h, obtaining a high-thermal-conductivity insulating material.

[0103] The electromagnetic shielding layer is composed of silver-plated copper braid and conductive slurry, the conductive slurry includes the following raw materials in weight parts: pretreated magnetic filler 15 parts, carboxylated graphene 10 parts, bonding matrix 25 parts, 3,3'-diamino diphenyl sulfone 4 parts, γ-methacryloxypropyl trimethoxysilane 1.0 parts, methyl isobutyl ketone 3 parts.

[0104] The electromagnetic shielding layer is prepared by the following method:

[0105] F1, mixing nickel-coated iron powder and γ-methacryloxypropyl trimethoxysilane in a mass ratio of 1.5:0.01, adding to an appropriate amount of ethanol solution, ball milling at a speed of 300 rpm for 1 h, vacuum drying at 75°C, obtaining a pretreated magnetic filler, ready for use;

[0106] F2, according to weight parts, mixing carboxylated graphene, pretreated magnetic filler, bonding matrix, methyl isobutyl ketone and 3,3'-diamino diphenyl sulfone, ultrasonic treatment for 15 min at a power of 500 W, obtaining a conductive slurry;

[0107] F3, dip the silver-coated copper braid into the conductive paste, and scrape coat to a thickness of 0.2 mm, control the curing temperature to be 120°C, and cure for 1 h to obtain an electromagnetic shielding layer.

[0108] Example Four

[0109] A high-temperature-resistant anti-interference cable, the cable is coaxially composed of a conductor layer, a high-heat-conducting inner insulation layer, a phase change buffer layer, an electromagnetic shielding layer, and a ceramicized outer sheath; the high-heat-conducting inner insulation layer is made of a high-heat-conducting insulation material, the high-heat-conducting insulation material comprises the following raw materials in parts by weight: base resin 50 parts, boron nitride nanosheet 15 parts, carboxylated graphene 5 parts, aluminate coupling agent 1.2 parts, 4,4'-diaminodiphenyl sulfone 7 parts, accelerator 0.3 parts, antioxidant 0.7 parts, and solvent 25 parts; the phase change buffer layer is composed of PCM microcapsules (melting point 245°C) 30%, fluorosilicone rubber 60%, and Al2O3 10%; and the ceramicized outer sheath is composed of ceramic precursor silicone rubber 75%, potassium titanate whisker 20%, and hyperbranched PI 5%.

[0110] The base resin is bisphenol A type epoxy resin, and the epoxy equivalent weight is 190 g / eq.

[0111] The accelerator is 2-ethyl-4-methylimidazole.

[0112] The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1.2.

[0113] The solvent is diethylene glycol dimethyl ether.

[0114] The high-heat-conducting insulation material is prepared by the following method:

[0115] A1, mix boron nitride and KH-550 in a volume ratio of 2:0.03, add to a proper amount of ethanol solution, ball mill at a speed of 400 rpm for 3 h, and vacuum dry at 85°C to obtain boron nitride nanosheet, which is ready for use;

[0116] A2, mix graphene and concentrated HNO3 / H2SO4 in a volume ratio of 1:3, heat to 65°C and reflux for 5 h, wash with deionized water until neutral, and freeze dry to obtain carboxylated graphene, which is ready for use;

[0117] A3, according to parts by weight, add boron nitride nanosheet, carboxylated graphene, and aluminate coupling agent to the solvent, and ultrasonic treat for 40 min to obtain a uniform slurry;

[0118] A4, according to parts by weight, mix the base resin, 4,4'-diaminodiphenyl sulfone, accelerator, antioxidant, and slurry uniformly, vacuum degas after pouring into a mold, control the temperature to be 150°C, and cure for 3 h to obtain the high-heat-conducting insulation material.

[0119] The electromagnetic shielding layer is composed of silver-plated copper braid and conductive paste, the conductive paste comprises raw materials in parts by weight: pretreated magnetic filler 20 parts, carboxylated graphene 12 parts, bonding matrix 35 parts, 3,3'-diamino diphenyl sulfone 8 parts, gamma-methacryloxypropyl trimethoxysilane 1.5 parts, methyl isobutyl ketone 7 parts.

[0120] The electromagnetic shielding layer is prepared by the following method:

[0121] F1, the nickel-coated iron powder and gamma-methacryloxypropyl trimethoxysilane are mixed in a mass ratio of 1.5:0.03, then added to an appropriate amount of ethanol solution, ball milled at a speed of 300 rpm for 3h, vacuum dried at 85℃, to obtain a pretreated magnetic filler, ready for use;

[0122] F2, according to the weight parts, the carboxylated graphene, pretreated magnetic filler, bonding matrix, methyl isobutyl ketone and 3,3'-diamino diphenyl sulfone are mixed, then ultrasonic treated at a power of 500W for 25min, to obtain a conductive paste;

[0123] F3, the silver-plated copper braid is immersed in the conductive paste, and is scraped to a thickness of 0.3mm, and the curing temperature is controlled at 160℃ for curing treatment for 2h, to obtain an electromagnetic shielding layer.

[0124] The above embodiment is a preferred implementation scheme of the present application, in addition to this, the present application can also be realized in other ways, any obvious replacement without departing from the concept of the present application is within the protection scope of the present application.

Claims

1. A high temperature resistant and anti-interference cable, characterized by: The cable is coaxially composed of a conductor layer, a high-thermal-conductivity inner insulating layer, a phase-change buffer layer, an electromagnetic shielding layer, and a ceramic outer sheath; the high-thermal-conductivity inner insulating layer is made of a high-thermal-conductivity insulating material, and the high-thermal-conductivity insulating material includes the following raw materials in parts by weight: 40-50 parts of a base resin, 10-15 parts of boron nitride nanosheets, 3-5 parts of carboxylated graphene, 0.8-1.2 parts of an aluminate coupling agent, 3-7 parts of 4,4'-diaminodiphenyl sulfone, 0.1-0.3 parts of a promoter, 0.3-0.7 parts of an antioxidant, and 15-25 parts of a solvent.

2. The high temperature resistant and anti-interference cable according to claim 1, characterized in that: The base resin is a bisphenol A epoxy resin with an epoxy equivalent weight of 180-190 g / eq.

3. The high temperature resistant and anti-interference cable according to claim 1, characterized in that: The accelerator is at least one of 2-ethyl-4-methylimidazole, DMP-30 accelerator, and EMI-24 accelerator.

4. The high temperature resistant and anti-interference cable according to claim 1, characterized in that: The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:0.8-1.

2.

5. The high temperature resistant and anti-interference cable according to claim 1, characterized in that: The solvent is at least one of diethylene glycol dimethyl ether, propylene glycol methyl ether acetate, gamma-butyrolactone and propylene carbonate.

6. The high temperature resistant and anti-interference cable according to claim 1, characterized in that: The high thermal conductivity insulating material is prepared by the following method: A1. Mix boron nitride and KH-550 in a volume ratio of 2:0.01-0.03, add the mixture to an appropriate amount of ethanol solution, and ball mill at 400 rpm for 1-3 h. Dry in a vacuum at 75-85° C. to obtain boron nitride nanosheets, which are set aside. A2. Graphene was mixed with concentrated HNO3 / H2SO4 in a volume ratio of 1:2-3, heated to 60-65°C and refluxed for 2-5 hours, washed with deionized water until neutral, and freeze-dried to obtain carboxylated graphene for later use; A3. Add boron nitride nanosheets, carboxylated graphene, and aluminate coupling agent to a solvent according to parts by weight, and ultrasonicate for 20-40 minutes to obtain a uniform slurry; A4. Mix the base resin, 4,4'-diaminodiphenyl sulfone, accelerator, antioxidant and slurry evenly according to weight. Pour the mixture into the mold after vacuum degassing. Control the temperature to 100-150℃ and cure for 1-3 hours to obtain a high thermal conductivity insulation material.

7. The high temperature resistant and anti-interference cable according to claim 1, characterized in that: The electromagnetic shielding layer is composed of a silver-plated copper braided mesh and a conductive paste. The conductive paste includes the following raw materials in parts by weight: 15-20 parts of pretreated magnetic filler, 10-12 parts of carboxylated graphene, 25-35 parts of bonding matrix, 4-8 parts of 3,3'-diaminodiphenyl sulfone, 1.0-1.5 parts of γ-methacryloxypropyltrimethoxysilane, and 3-7 parts of methyl isobutyl ketone.

8. The high temperature resistant and anti-interference cable according to claim 7, characterized in that: The electromagnetic shielding layer is prepared by the following method: F1. Mix nickel-coated iron powder and γ-methacryloxypropyltrimethoxysilane in a mass ratio of 1.5:0.01-0.03, add the mixture to an appropriate amount of ethanol solution, and ball-mill at a speed of 300 rpm for 1-3 hours. Dry the mixture under vacuum at 75-85°C to obtain a pretreated magnetic filler for later use. F2. Mix carboxylated graphene, pretreated magnetic filler, bonding matrix, methyl isobutyl ketone, and 3,3'-diaminodiphenyl sulfone according to parts by weight, and ultrasonically treat the mixture at a power of 500 W for 15-25 min to obtain a conductive slurry; F3. Dip the silver-plated copper braided mesh into the conductive slurry and apply it to a thickness of 0.2-0.3 mm. Control the curing temperature to 120-160°C for 1-2 hours to obtain the electromagnetic shielding layer.

9. The high temperature resistant and anti-interference cable according to claim 1, characterized in that: The phase change buffer layer is composed of 25-30% PCM microcapsules, 55-60% fluorosilicone rubber and 10-15% Al2O3.

10. The high temperature resistant and anti-interference cable according to claim 1, characterized in that: The ceramic outer sheath is composed of 70-75% of ceramic precursor silicone rubber, 15-20% of potassium titanate whiskers and 5-8% of hyperbranched PI.

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