A cable with modified molybdenum sulfide nanosheet doped matrix resin and a preparation method thereof

Abstract

The present application relates to the technical field of cable, more particularly to a kind of modified molybdenum sulfide nanosheet doped matrix resin cable and its preparation method.The production method includes the following steps:S1, twisting multiple wires to form inner conductor;S2, outer covering of physical foaming medium layer to inner conductor;S3, outer covering of shielding layer to medium layer;S4, outer covering of protective layer to shielding layer;The medium layer, by mass fraction, raw materials include:90-100 parts of matrix resin, 5-15 parts of modified molybdenum sulfide nanosheet, 0.5-1.5 parts of nucleating agent;The production method of the present application solves the problems of existing radio frequency cable, such as impedance mismatch, high voltage standing wave ratio, poor shielding anti-interference performance, poor flexibility, etc., and the prepared cable has excellent aging resistance and temperature cycle performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable preparation, more particularly, to a modified molybdenum sulfide nanosheet doped base resin cable and a preparation method thereof. BACKGROUND

[0002] A general cable is usually composed of an outer insulating protective layer and an inner filling layer, a conductive conductor and the like cable main body, wherein the protective layer directly affects the service life of the cable. In order to improve the weather resistance of the cable, a Chinese patent with publication number CN117551314A discloses a high-strength and high-weather-resistance cable and a preparation method thereof. The technical solution prepares a modified fluorosilicon crosslinking agent modified high-density polyethylene material, thereby preparing a high-performance weather-resistant insulating layer. The technical solution introduces a large amount of fluorine element in the modified fluorosilicon crosslinking agent, utilizes the high electronegativity of the fluorine element to improve the friction resistance and water resistance of the weather-resistant insulating layer. On this basis, the modified fluorosilicon crosslinking agent prepared by the technical solution also has an olefin double bond. In a high-temperature environment, the olefin double bond will further crosslink with the high-density polyethylene, thereby further improving the material stability and the wear resistance and ultraviolet resistance of the cable, and greatly prolonging the service life of the cable. However, the modified fluorosilicon crosslinking agent modified high-density polyethylene material may cause the flexibility of the cable to decrease at low temperature, thereby causing poor temperature impact performance of the cable.

[0003] A Chinese patent with publication number CN118325216A discloses a low-temperature-resistant medium-low-voltage power cable and a preparation method thereof. The following raw materials are weighed: EVA resin 40-50 parts, PE resin 120-150 parts, reinforcing resin 30-40 parts, calcium carbonate 6-8 parts, modified filler 15-30 parts and dicumyl peroxide 5-10 parts. The raw materials are melt blended at a temperature of 140-150°C to obtain a modified resin. The modified resin is coated on the surface of the conductor to form an insulating layer. A wrapping inner liner layer is arranged outside the insulating layer. The wrapping inner liner layer is filled with a filler between the insulating layer. Finally, the modified resin is coated outside the wrapping inner liner layer to form a sheath, thereby obtaining the power cable. The reinforcing resin has an organic silicon chain segment as a main chain, which can improve the low-temperature resistance of the modified resin. Meanwhile, the reinforcing resin contains a long-chain alkyl group as a side chain, which can increase the gap between the molecular chains and reduce the intermolecular force, thereby improving the toughness of the modified resin. However, the EVA resin and the PE resin are both susceptible to ultraviolet light.

[0004] Radio frequency cable is an indispensable component in radar and communication equipment, with the characteristics of high frequency, impedance matching, low loss, shielding effect, flexibility, stable frequency response, etc., and is widely used in wireless communication, television broadcast, radar, aerospace and other fields. Radio frequency cable and ordinary cable are the same, and both need to improve their service life through a protective layer. In addition, radio frequency cable may encounter some common problems during use, which may affect signal transmission quality and system performance, such as signal attenuation, impedance mismatch, increase of standing wave ratio, external interference, mechanical damage, uneven frequency response, etc. SUMMARY

[0005] The purpose of the present application is to provide a modified molybdenum sulfide nanosheet doped base resin cable and its preparation method, which solves the problems of existing radio frequency cable, such as impedance mismatch, large voltage standing wave ratio, poor shielding anti-interference performance, poor flexibility, etc., and the prepared cable has excellent temperature cycle resistance.

[0006] The first aspect of the present application provides a preparation method of a modified molybdenum sulfide nanosheet doped base resin cable, comprising the following steps:

[0007] S1, twisting a plurality of wires to form an inner conductor;

[0008] S2, coating the inner conductor with a physically foamed medium layer;

[0009] S3, coating the medium layer with a shielding layer;

[0010] S4, coating the shielding layer with a protective layer;

[0011] The medium layer comprises, by mass fraction, raw materials including: base resin 90-100 parts, modified molybdenum sulfide nanosheet 5-15 parts, nucleating agent 0.5-1.5 parts;

[0012] The base resin comprises polyfluoroethylene propylene resin, polytetrafluoroethylene resin and low-density polyethylene resin; the mass ratio of the polyfluoroethylene propylene resin, the polytetrafluoroethylene resin and the low-density polyethylene resin is (4-6):(2-4):1;

[0013] The preparation method of the modified molybdenum sulfide nanosheet comprises the following steps: adding molybdenum sulfide nanosheet into an ethanol solution containing stearic acid, stirring uniformly, reacting at 40-60℃ for 40-60min, and evaporating ethanol to obtain.

[0014] Preferably, the mass ratio of the base resin, the modified molybdenum sulfide nanosheet and the nucleating agent is (94-96):(8-12):(0.8-1.2).

[0015] Preferably, the melt index of the polyfluoroethylene propylene resin is 8.1-12g / 10min.

[0016] Preferably, the polytetrafluoroethylene resin has a tensile strength of 28 MPa and an average particle size of 400-900 μm.

[0017] Preferably, the density of the low-density polyethylene resin is 918.5-921.5 g / cm³. 3 (23℃), melt flow rate is 1.84-2.5 g / 10 min.

[0018] Preferably, the ratio of molybdenum sulfide, stearic acid, and ethanol is 1g:(0.05-0.1)g:(25-30)mL.

[0019] Preferably, the thickness of the molybdenum sulfide nanosheets is 5-10 nm.

[0020] Preferably, the mass ratio of the matrix resin, modified molybdenum sulfide nanosheets, and nucleating agent is 95:10:1.

[0021] During the experiment, the inventors unexpectedly discovered that when stearic acid-modified molybdenum sulfide nanosheets were introduced into the system, and the mass ratio of matrix resin, modified molybdenum sulfide nanosheets, and nucleating agent was controlled at (94-96):(8-12):(0.8-1.2), the resulting cable exhibited excellent corrosion resistance and shielding performance. The inventors hypothesize that this is because the matrix resin, inserted into the layered structure of the molybdenum sulfide nanosheets, reduces the possibility of dielectric intrusion, improves corrosion resistance, and the resulting composite material possesses superior shielding performance. Simultaneously, the stearic acid-modified molybdenum sulfide nanosheets, working in conjunction with the nucleating agent, can form a dense and uniform pore structure, further enhancing the corrosion resistance and shielding performance of the dielectric layer.

[0022] Preferably, the nucleating agent is selected from at least one of nano-silicon nitride, nano-boron nitride, nano-calcium carbonate, and nano-calcium sulfate.

[0023] Preferably, step S2 specifically involves: pre-mixing the raw materials of the dielectric layer evenly, then adding them to an extruder and melting them at 340-350°C; introducing carbon dioxide gas into the melted dielectric layer raw materials in the extruder; mixing evenly at 340-350°C; and then uniformly extruding them through the extruder head onto the outer periphery of the inner conductor, foaming, and cooling to obtain the final product.

[0024] Preferably, the total weight ratio of the raw materials in the medium layer to the weight ratio of carbon dioxide is 1:(0.05-0.1).

[0025] Preferably, the shielding layer is made of carbon nanotubes, polyvinylidene fluoride, and hollow mesoporous carbon spheres; the mass ratio of the carbon nanotubes, polyvinylidene fluoride, and hollow mesoporous carbon spheres is (0.6-1):(3-5):(0.3-0.5).

[0026] Preferably, the carbon nanotubes include single-walled carbon nanotubes, multi-walled carbon nanotubes, and whisker carbon nanotubes; the mass ratio of the single-walled carbon nanotubes, multi-walled carbon nanotubes, and whisker carbon nanotubes is 1:(4-6):(0.6-0.8).

[0027] Preferably, the diameter of the single-walled carbon nanotube is 1-2 nm.

[0028] Preferably, the diameter of the multi-walled carbon nanotubes is 8-15 nm.

[0029] Preferably, the inner diameter of the whisker carbon nanotubes is 2-5 nm.

[0030] Preferably, the hollow mesoporous carbon spheres have a particle size of 200-300 nm and a pore size of 5 nm.

[0031] The inventors discovered that while introducing molybdenum sulfide nanosheets into the dielectric layer system and preparing the dielectric layer using physical foaming technology can improve the shielding performance to some extent, the shielding performance is limited. Unexpectedly, they found that when carbon nanotubes include single-walled carbon nanotubes, multi-walled carbon nanotubes, and whisker carbon nanotubes, and the diameter of the single-walled carbon nanotubes is controlled to be 1-2 nm, the diameter of the multi-walled carbon nanotubes to be 8-15 nm, and the inner diameter of the whisker carbon nanotubes to be 2-5 nm, and hollow mesoporous carbon spheres with a particle size of 200-300 nm and a pore size of 5 nm are introduced, the prepared cable not only has excellent shielding performance, meeting the requirements for safe operation and service life of the cable, but also improves the aging stability of the cable. The inventors speculate that the shielding layer prepared under these conditions, due to the high specific surface area of ​​the carbon nanotubes and hollow mesoporous microspheres and the resulting composite structure, helps to capture and neutralize harmful substances in the cable that may cause aging, while simultaneously enhancing the strength and durability of the shielding layer, thereby improving the aging stability of the cable.

[0032] Preferably, the protective layer is made of the following raw materials: methyl vinyl phenyl silicone rubber, hyperbranched polyurethane, polyvinyl alcohol, and inorganic nanomaterials; the mass ratio of the methyl vinyl phenyl silicone rubber, hyperbranched polyurethane, polyvinyl alcohol, and inorganic nanomaterials is (10-20):(2-4):(5-10):(5-10).

[0033] Preferably, the inorganic nanomaterials include α-phase silicon nitride nanoparticles, near-spherical calcium carbonate nanoparticles, and alumina nanosheets, wherein the mass ratio of the α-phase silicon nitride nanoparticles, near-spherical calcium carbonate nanoparticles, and alumina nanosheets is (2-4):(5-7):1.

[0034] Preferably, the particle size of the α-phase nano-silicon nitride is 400-600 nm.

[0035] Preferably, the particle size of the spherical nano-calcium carbonate is 50-150 nm.

[0036] Preferably, the alumina nanosheets have a particle size of 2-4 nm.

[0037] This invention introduces inorganic nanomaterials into the protective layer. When the inorganic nanomaterials comprise α-phase nano-silicon nitride, spherical nano-calcium carbonate, and alumina nanosheets in a mass ratio of (2-4):(5-7):1, the resulting cable exhibits no dimensional change in appearance during temperature shock. The inventors hypothesize that this is because the α-phase nano-silicon nitride, spherical nano-calcium carbonate, and alumina nanosheets under these conditions interact with methyl vinyl phenyl silicone rubber, hyperbranched polyurethane, and polyvinyl alcohol, forming an interpenetrating structure. This results in a tighter bond between the inorganic nanomaterials and the organic matter, thereby enhancing resistance to temperature shock.

[0038] Preferably, S4 specifically comprises:

[0039] Step 1: Dissolve methyl vinyl phenyl silicone rubber, hyperbranched polyurethane, polyvinyl alcohol, and inorganic nanomaterials in water respectively;

[0040] Step 2: Mix the aqueous solution of methyl vinyl phenyl silicone rubber, the aqueous solution of hyperbranched polyurethane, the aqueous solution of polyvinyl alcohol, and the aqueous solution of inorganic nanomaterials evenly to obtain a mixed solution. Assemble the mixed solution by a blade coating method and then dry it to obtain a single-layer composite film.

[0041] Step 3: A methyl vinyl phenyl silicone rubber aqueous solution is laminated onto the surface of a single-layer composite film, then another single-layer composite film is laminated, followed by a polyvinyl alcohol aqueous solution laminated onto the single-layer composite film, then another single-layer composite film is laminated, followed by a hyperbranched polyurethane aqueous solution laminated onto the single-layer composite film, and finally another single-layer composite film is laminated; the thickness of the single-layer composite film is 20-30 μm.

[0042] Step 4: Repeat step 3 20-25 times and then hot press to obtain the composite material. Then, use the composite material to coat the shielding layer through an extrusion process.

[0043] The shielding and protective layers of this invention introduce a large amount of inorganic materials, which can improve the shielding and protection of the cable, but results in poor cable flexibility. The inventors have found that when the protective layer is prepared using the specific protective layer raw materials of this invention and the specific process of this invention, the cable flexibility can be significantly improved. The inventors speculate that this is because the staggered layered structure of the prepared composite material increases the fracture interface of the protective layer, thereby improving the cable's ability to withstand deformation.

[0044] Preferably, the ratio of the methyl vinyl phenyl silicone rubber to water is 0.3-0.5 g / mL, more preferably 0.4 g / mL.

[0045] Preferably, the ratio of the hyperbranched polyurethane to water is 0.1-0.3 g / mL, and more preferably 0.2 g / mL.

[0046] Preferably, the ratio of polyvinyl alcohol to water is 0.05-0.1 g / mL, and more preferably 0.08 g / mL.

[0047] Preferably, the ratio of the inorganic nanomaterial to water is 0.1-0.15 g / mL, and more preferably 0.12 g / mL.

[0048] Preferably, the conductor is a silver-plated copper wire, and the inner conductor diameter is 0.2-0.4mm ± 0.005mm.

[0049] Preferably, step S3 is obtained by extruding the shielding layer material through an extruder.

[0050] Preferably, the diameter of the dielectric layer is 0.6-0.8 mm ± 0.02 mm.

[0051] Preferably, the diameter of the shielding layer is 0.6-0.8 mm.

[0052] Preferably, the diameter of the protective layer is 0.5-0.7 mm.

[0053] A second aspect of the present invention provides a cable obtained by a method for preparing a cable from the above-described modified molybdenum sulfide nanosheet-doped matrix resin.

[0054] Beneficial effects

[0055] 1. The present invention introduces stearic acid-modified molybdenum sulfide nanosheets into the system and controls the mass ratio of matrix resin, modified molybdenum sulfide nanosheets and nucleating agent to be (94-96):(8-12):(0.8-1.2), and the resulting cable has excellent corrosion resistance and shielding performance.

[0056] 2. In this invention, carbon nanotubes include single-walled carbon nanotubes, multi-walled carbon nanotubes, and whisker carbon nanotubes. The diameter of the single-walled carbon nanotubes is controlled to be 1-2 nm, the diameter of the multi-walled carbon nanotubes is 8-15 nm, and the inner diameter of the whisker carbon nanotubes is 2-5 nm. Hollow mesoporous carbon spheres with a particle size of 200-300 nm and a pore size of 5 nm are introduced. The resulting cable not only has excellent shielding performance, meeting the requirements for safe operation and service life of the cable, but also improves the aging stability of the cable.

[0057] 3. This invention introduces inorganic nanomaterials into the protective layer. When the inorganic nanomaterials include α-phase nano-silicon nitride, spherical nano-calcium carbonate and alumina nanosheets in a mass ratio of (2-4):(5-7):1, the resulting cable can maintain its appearance and size without change during temperature shock.

[0058] 4. When the protective layer is prepared using the specific protective layer raw materials of this invention and the specific process of this invention, the flexibility of the cable can be significantly improved. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the structure of the cable prepared in Example 1 of the present invention;

[0060] In the diagram, 1-inner conductor, 2-dielectric layer, 3-shielding layer, 4-protective layer. Detailed Implementation

[0061] To better explain the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to examples. The described embodiments are merely some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0062] Example 1

[0063] Example 1 provides as follows Figure 1 The method for preparing a cable with a modified molybdenum sulfide nanosheet-doped matrix resin, as shown, includes the following steps:

[0064] S1. Stranded multiple wires are twisted together to form inner conductor 1;

[0065] S2, the inner conductor 1 is covered with a physically foamed dielectric layer 2;

[0066] S3. Cover the dielectric layer 2 with a shielding layer 3;

[0067] S4. Cover the shielding layer 3 with a protective layer 4;

[0068] The medium layer 2, by mass, comprises the following raw materials: 95 parts of matrix resin, 10 parts of modified molybdenum sulfide nanosheets, and 1 part of nucleating agent.

[0069] The matrix resin includes perfluoroethylene propylene resin, polytetrafluoroethylene resin, and low-density polyethylene resin; the mass ratio of the perfluoroethylene propylene resin, polytetrafluoroethylene resin, and low-density polyethylene resin is 5:3:1;

[0070] The method for preparing the modified molybdenum sulfide nanosheets includes the following steps: adding molybdenum sulfide nanosheets to an ethanol solution containing stearic acid, stirring evenly, reacting at 50°C for 50 min, and evaporating the ethanol to obtain the nanosheets.

[0071] The poly(fluoroethylene propylene) resin has a melt index of 8.1-12 g / 10 min and was purchased from Guangzhou Songbai Chemical Co., Ltd., model: SW-4.

[0072] The polytetrafluoroethylene resin has a tensile strength of 28 MPa and an average particle size of 650 ± 250 μm. It was purchased from Zhejiang Juhua Co., Ltd., model: JF-4D.

[0073] The density of the low-density polyethylene resin is 918.5-921.5 g / cm³. 3 (23℃), melt flow rate of 1.84-2.5 g / 10 min, purchased from Maoming Petrochemical, grade: 951-050.

[0074] The ratio of molybdenum sulfide, stearic acid, and ethanol is 1g:0.1g:30mL.

[0075] The molybdenum sulfide nanosheets, with a thickness of 5-10 nm, were purchased from Hefei Kejing Materials Technology Co., Ltd.

[0076] The nucleating agent is nano-boron nitride, purchased from Zhejiang Zhitai Nano-Micro New Materials Co., Ltd., with an average particle size of 100nm.

[0077] S2 specifically involves: pre-mixing the raw materials of the dielectric layer 2 evenly, then adding them to an extruder and melting them at 350°C, introducing carbon dioxide gas into the melted raw materials of the dielectric layer 2 in the extruder, mixing them evenly at 350°C, and then extruding them evenly around the inner conductor 1 through the extruder head, foaming, and cooling to obtain the final product.

[0078] The total weight ratio of the raw materials in the medium layer 2 to the weight ratio of carbon dioxide is 1:0.08.

[0079] The shielding layer 3 is made of carbon nanotubes, polyvinylidene fluoride, and hollow mesoporous carbon spheres; the mass ratio of the carbon nanotubes, polyvinylidene fluoride, and hollow mesoporous carbon spheres is 0.8:4:0.4.

[0080] The carbon nanotubes include single-walled carbon nanotubes, multi-walled carbon nanotubes, and whisker carbon nanotubes; the mass ratio of the single-walled carbon nanotubes, multi-walled carbon nanotubes, and whisker carbon nanotubes is 1:5:0.7.

[0081] The single-walled carbon nanotubes have a diameter of 1-2 nm, the multi-walled carbon nanotubes have a diameter of 8-15 nm, the whisker carbon nanotubes have an inner diameter of 2-5 nm, and the hollow mesoporous carbon spheres have a particle size of 200-300 nm and a pore size of 5 nm. All of these were purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd., with product numbers 104699, 100246, 104271, and 104934, respectively.

[0082] The polyvinylidene fluoride grade is: Juhua PVDF DE 6-4 type resin.

[0083] The protective layer 4 is made of the following raw materials: methyl vinyl phenyl silicone rubber, hyperbranched polyurethane, polyvinyl alcohol, and inorganic nanomaterials.

[0084] The inorganic nanomaterials include α-phase silicon nitride nanoparticles, near-spherical calcium carbonate nanoparticles, and alumina nanosheets, with a mass ratio of 3:6:1.

[0085] The α-phase nano-silicon nitride has a particle size of 500 nm and was purchased from Brofos Nanotechnology (Ningbo) Co., Ltd., product number: Brofos-Si3N4-A500.

[0086] The spherical nano-calcium carbonate particles have a diameter of 100 nm and were purchased from Brofos Nanotechnology (Ningbo) Co., Ltd., product number: Brofos-CaCO3-100.

[0087] The alumina nanosheets have a particle size of 3 nm and were purchased from Brofos Nanotechnology (Ningbo) Co., Ltd., model: Brofos-Al2O3.

[0088] The mass ratio of the methyl vinyl phenyl silicone rubber, hyperbranched polyurethane, polyvinyl alcohol, and inorganic nanomaterials is 15:3:7:8.

[0089] Specifically, S4 is:

[0090] Step 1: Dissolve methyl vinyl phenyl silicone rubber, hyperbranched polyurethane, polyvinyl alcohol, and inorganic nanomaterials in water respectively;

[0091] Step 2: Mix the aqueous solution of methyl vinyl phenyl silicone rubber, the aqueous solution of hyperbranched polyurethane, the aqueous solution of polyvinyl alcohol, and the aqueous solution of inorganic nanomaterials evenly to obtain a mixed solution. Assemble the mixed solution by a blade coating method and then dry it to obtain a single-layer composite film.

[0092] Step 3: Sequentially laminate an aqueous solution of methyl vinyl phenyl silicone rubber onto the surface of a single-layer composite film, then laminate another single-layer composite film, followed by an aqueous solution of polyvinyl alcohol onto the single-layer composite film, then laminate another single-layer composite film, then laminate a hyperbranched polyurethane aqueous solution onto the single-layer composite film, and finally laminate another single-layer composite film; the thickness of the single-layer composite film is 25 μm;

[0093] Step 4: Repeat step 3 20 times and then hot press to obtain the composite material. Then, use the composite material to coat the shielding layer 3 through an extrusion process.

[0094] The ratio of the methyl vinyl phenyl silicone rubber to water is 4 g / mL.

[0095] The ratio of the hyperbranched polyurethane to water is 0.2 g / mL.

[0096] The ratio of polyvinyl alcohol to water is 0.08 g / mL.

[0097] The ratio of the inorganic nanomaterial to water is 0.12 g / mL.

[0098] S3 is obtained by extruding the raw material of shielding layer 3 through an extruder.

[0099] The conductor is a silver-plated copper wire, and the inner conductor 1 has a diameter of 0.3mm ± 0.005mm.

[0100] The diameter of the dielectric layer 2 is 0.7 mm ± 0.02 mm.

[0101] The diameter of the shielding layer 3 is 0.7 mm.

[0102] The protective layer 4 has a diameter of 0.6 mm.

[0103] A cable prepared by the above-mentioned method for preparing a modified molybdenum sulfide nanosheet-doped matrix resin.

[0104] Example 2

[0105] Example 2 provides a method for preparing a cable with modified molybdenum sulfide nanosheets doped with matrix resin and the cable itself. The specific implementation method is the same as in Example 1, except that the dielectric layer 2, by mass, comprises: 94 parts matrix resin, 8 parts modified molybdenum sulfide nanosheets, and 0.8 parts nucleating agent.

[0106] Example 3

[0107] Example 3 provides a method for preparing a cable with modified molybdenum sulfide nanosheet doped matrix resin and the cable thereof. The specific implementation method is the same as that in Example 1, except that the mass ratio of the polytetrafluoroethylene resin, polytetrafluoroethylene resin and low-density polyethylene resin is 6:2:1.

[0108] Comparative Example 1

[0109] Comparative Example 1 provides a method for preparing a cable with modified molybdenum sulfide nanosheets doped with matrix resin and the cable itself. The specific implementation method is the same as in Example 1, except that the dielectric layer 2, by mass, comprises: 90 parts of matrix resin, 15 parts of modified molybdenum sulfide nanosheets, and 0.5 parts of nucleating agent.

[0110] Comparative Example 2

[0111] Comparative Example 2 provides a method for preparing a cable with modified molybdenum sulfide nanosheets doped matrix resin and the cable itself. The specific implementation method is the same as that in Example 1, except that the diameter of the multi-walled carbon nanotubes is 20-30 nm, and they are purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd., with item number 100246.

[0112] Comparative Example 3

[0113] Comparative Example 3 provides a method for preparing a cable with modified molybdenum sulfide nanosheets doped matrix resin and the cable itself. The specific implementation method is the same as that in Example 1, except that the hollow mesoporous carbon spheres are replaced with carbon nanocages, which were purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd., with the product number 104497.

[0114] Comparative Example 4

[0115] Comparative Example 4 provides a method for preparing a cable with modified molybdenum sulfide nanosheets doped with matrix resin and the cable itself. The specific implementation method is the same as in Example 1, except that the alumina nanosheets are replaced with spherical nano-alumina with a particle size of 2μm, purchased from Brofos Nanotechnology (Ningbo) Co., Ltd., product number: Brofos-Al2O3-Q02.

[0116] Comparative Example 5

[0117] Comparative Example 5 provides a method for preparing a cable with a modified molybdenum sulfide nanosheet doped matrix resin and the cable thereof. The specific implementation method is the same as that in Example 1, except that the mass ratio of the α-phase nano-silicon nitride, the spherical nano-calcium carbonate and the alumina nanosheet is 1:3:1.

[0118] Comparative Example 6

[0119] Comparative Example 6 provides a method for preparing a cable with a modified molybdenum sulfide nanosheet doped matrix resin and a cable thereof. The specific implementation method is the same as that of Example 1, except that step S4 is: directly extruding the raw material of the protective layer 4 and coating it on the outside of the shielding layer 3.

[0120] Performance testing: The cables of Examples 1-3 and Comparative Examples 1-6 were subjected to the following tests:

[0121] 1. Voltage Standing Wave Ratio (VSWR): After assembling the cable with connectors, test it with a network analyzer. The scanning frequency is 801 points. When the VSWR of the cable is ≤1.2 across the entire frequency range, it is considered qualified.

[0122] 2. Impedance: The impedance of the cable is measured using an impedance analyzer. If it is within the range of 50±2Ω, it is considered qualified.

[0123] 3. Attenuation Performance: After assembling the cable with connectors, a network analyzer was used for testing. The scanned frequency was 801 points. When simultaneously meeting the requirement of a frequency of 0.5GHz, the attenuation constant was ≤0.37dB.m -1 At a frequency of 1.0 GHz, the attenuation constant is ≤0.53 dB.m. -1 At a frequency of 3.0 GHz, the attenuation constant is ≤0.93 dB.m -1 At a frequency of 6.0 GHz, the attenuation constant is ≤1.33 dB.m -1 At a frequency of 8.0 GHz, the attenuation constant is ≤1.55 dB.m -1 If the time is right, it is recorded as qualified.

[0124] 4. Aging stability: The cable is placed in an environment of 125℃ for 168 hours. After the test, it is placed at room temperature for 4 hours. Then, the cable is checked for cracking and blistering. The cable is then assembled with connectors, and the voltage standing wave ratio of the cable is tested with a network analyzer to see if there is any change. When the cable does not show cracking or blistering and the voltage standing wave ratio is ≤1.2, it is considered qualified.

[0125] 5. Temperature shock: The cable is subjected to a temperature treatment of -55℃ to +165℃ for 20 temperature cycles. The cable is observed to see if there is any change in size. Then the cable is assembled with a connector, and the voltage standing wave ratio (VSWR) of the cable is tested with a network analyzer to see if there is any change. When the cable size does not change and the VSWR is ≤1.2, it is considered qualified.

[0126] 6. Shielding performance: Test frequency is 50-200MHz.

[0127] 7. Salt spray test: Refer to IEC 60068-2-52 for salt spray test: 5% salt solution, 35℃*48h, observe whether there is corrosion in the cable. If no corrosion is found, the cable is considered qualified.

[0128] 8. Tensile properties: The tensile properties of the cable are tested using a universal testing machine at a test speed of 20 mm / min.

[0129] Test results:

[0130] Table 1 Performance test results of Examples 1-3 and Comparative Examples 1-6

[0131]

[0132] As can be seen from Table 1, due to the change in the raw material ratio of the dielectric layer, the cable obtained in Comparative Example 1 had unqualified attenuation performance and salt spray performance, and its shielding performance was reduced.

[0133] Comparative Examples 2 and 3, due to changes in the diameter of multi-walled carbon nanotubes and hollow mesoporous carbon spheres in the shielding layer, resulted in cables with unsatisfactory aging stability and decreased shielding performance.

[0134] Comparative Examples 4 and 5, due to changes in the type and proportion of protective layer materials, resulted in cables that failed the temperature shock and salt spray tests, and their tensile properties decreased.

[0135] Comparative Example 6: Due to the manufacturing process of the protective layer, the resulting cable failed to meet aging standards and its tensile properties decreased.

[0136] The above description is merely a specific embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for preparing a cable with a modified molybdenum sulfide nanosheet-doped matrix resin, characterized in that, Includes the following steps: S1. Twisted multiple strands of wire to form an inner conductor; S2, an inner conductor covered with a physically foamed dielectric layer; S3. Cover the dielectric layer with a shielding layer; S4. Cover the shielding layer with a protective layer; The dielectric layer, by weight, comprises: 90-100 parts of matrix resin, 5-15 parts of modified molybdenum sulfide nanosheets, and 0.5-1.5 parts of nucleating agent. The matrix resin includes perfluoroethylene propylene resin, polytetrafluoroethylene resin and low-density polyethylene resin; the mass ratio of perfluoroethylene propylene resin, polytetrafluoroethylene resin and low-density polyethylene resin is (4-6):(2-4):1; The method for preparing the modified molybdenum sulfide nanosheets includes the following steps: adding molybdenum sulfide nanosheets to an ethanol solution containing stearic acid, stirring evenly, reacting at 40-60℃ for 40-60 min, and evaporating the ethanol to obtain the nanosheets.

2. The method for preparing the cable of the modified molybdenum sulfide nanosheet-doped matrix resin according to claim 1, characterized in that, The mass ratio of the matrix resin, modified molybdenum sulfide nanosheets, and nucleating agent is (94-96):(8-12):(0.8-1.2).

3. The method for preparing the cable with modified molybdenum sulfide nanosheet-doped matrix resin according to claim 1, characterized in that, The shielding layer is made of carbon nanotubes, polyvinylidene fluoride, and hollow mesoporous carbon spheres; the mass ratio of the carbon nanotubes, polyvinylidene fluoride, and hollow mesoporous carbon spheres is (0.6-1):(3-5):(0.3-0.5).

4. The method for preparing the cable of the modified molybdenum sulfide nanosheet-doped matrix resin according to claim 3, characterized in that, The carbon nanotubes include single-walled carbon nanotubes, multi-walled carbon nanotubes, and whisker carbon nanotubes; the mass ratio of the single-walled carbon nanotubes, multi-walled carbon nanotubes, and whisker carbon nanotubes is 1:(4-6):(0.6-0.8).

5. The method for preparing a cable with modified molybdenum sulfide nanosheet-doped matrix resin according to claim 4, characterized in that, The diameter of the single-walled carbon nanotube is 1-2 nm; the diameter of the multi-walled carbon nanotube is 8-15 nm; and the inner diameter of the whisker carbon nanotube is 2-5 nm.

6. The method for preparing a cable with modified molybdenum sulfide nanosheet-doped matrix resin according to claim 5, characterized in that, The hollow mesoporous carbon spheres have a particle size of 200-300 nm and a pore size of 5 nm.

7. The method for preparing a cable with modified molybdenum sulfide nanosheet-doped matrix resin according to claim 1, characterized in that, The protective layer is made of the following raw materials: methyl vinyl phenyl silicone rubber, hyperbranched polyurethane, polyvinyl alcohol, and inorganic nanomaterials; the mass ratio of the methyl vinyl phenyl silicone rubber, hyperbranched polyurethane, polyvinyl alcohol, and inorganic nanomaterials is (10-20):(2-4):(5-10):(5-10).

8. The method for preparing a cable with modified molybdenum sulfide nanosheet-doped matrix resin according to claim 7, characterized in that, The inorganic nanomaterials include α-phase silicon nitride nanoparticles, near-spherical calcium carbonate nanoparticles, and alumina nanosheets, with a mass ratio of (2-4):(5-7):

1.

9. The method for preparing a cable with modified molybdenum sulfide nanosheet-doped matrix resin according to claim 8, characterized in that, Specifically, S4 is: Step 1: Dissolve methyl vinyl phenyl silicone rubber, hyperbranched polyurethane, polyvinyl alcohol, and inorganic nanomaterials in water respectively; Step 2: Mix the aqueous solution of methyl vinyl phenyl silicone rubber, the aqueous solution of hyperbranched polyurethane, the aqueous solution of polyvinyl alcohol, and the aqueous solution of inorganic nanomaterials evenly to obtain a mixed solution. Assemble the mixed solution by a blade coating method and then dry it to obtain a single-layer composite film. Step 3: A methyl vinyl phenyl silicone rubber aqueous solution is laminated onto the surface of a single-layer composite film, then another single-layer composite film is laminated, followed by a polyvinyl alcohol aqueous solution laminated onto the single-layer composite film, then another single-layer composite film is laminated, followed by a hyperbranched polyurethane aqueous solution laminated onto the single-layer composite film, and finally another single-layer composite film is laminated; the thickness of the single-layer composite film is 20-30 μm. Step 4: Repeat step 3 20-25 times and then hot press to obtain the composite material. Then, use the composite material to coat the shielding layer through an extrusion process.

10. A cable obtained by the method of preparing a cable of a modified molybdenum sulfide nanosheet doped matrix resin according to any one of claims 1-9.

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