CN112876758A - B1-level control cable for power equipment and manufacturing process - Google Patents
B1-level control cable for power equipment and manufacturing process Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1875—Multi-layer sheaths
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- C08K2003/2224—Magnesium hydroxide
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
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Abstract
The invention discloses a B1-grade control cable for power equipment and a manufacturing process thereof. According to the invention, the oxygen-insulating layer and the outer sheath layer structure are arranged outside the shielding layer, and the wrapping layers are matched between the layer structures, so that the cable can pass a B1-level combustion test and a bundled A-type flame retardant test; and the base material of the outer sheath layer mainly comprises polyethylene, polyolefin elastomer and ethylene-vinyl acetate copolymer resin, on the premise of ensuring that the physical and mechanical properties of the outer sheath layer meet the product standard, the components of the polyethylene are properly reduced, the ethylene-vinyl acetate copolymer resin with lower ethylene content is selected, and the ultra-fine composite flame retardant is added to promote the dehydration and carbonization of the polymer to form a carbon layer with certain thickness and strength, so that the functions of blocking combustion and preventing dripping are realized.
Description
Technical Field
The invention relates to the technical field of control cables, in particular to a B1-level control cable for power equipment and a manufacturing process thereof.
Background
With the rapid increase of the demand of control cables, the society pays more and more attention to the safety and reliability of the control cables. The control cable is used as a power equipment protection system and is a nerve center of a power system, and the actions of equipment transmit signals or instructions through the control cable, so that the safety of the control cable is very important. Under the condition of fire, the combustion performance is one of the main safety indexes of the control cable, and the product standards GB/T9330 and GB/T19666 only need to meet the bundled flame retardant performance and cannot comprehensively reflect the influence of the cable on the surrounding environment under the fire accident. In recent years, the market has put higher demands on the flame performance of control cables, which are no longer limited to bundled flame retardancy, but also require cables to meet the class B1 flame performance specified in the classification standard GB 31247-2014.
The B1 control cable is mainly used as an electrical connection for power distribution equipment. The conventional B1-grade control cable only considers the bundled flame-retardant property of the cable, does not consider the factors of heat release, smoke toxicity, burning drips and the like which are harmful to the outside when the cable burns under the fire condition, and gradually cannot meet the requirement on fire safety.
Disclosure of Invention
In order to solve the technical problem, an object of the present invention is to provide a B1-level control cable for power equipment, including a cable core, a shielding layer, a metal armor layer and an outer sheath layer, which are sequentially arranged from inside to outside, wherein a lapping layer is arranged between the cable core and the shielding layer, an oxygen-isolating layer is arranged between the shielding layer and the metal armor layer, and an outer sheath layer is arranged outside the metal armor layer;
the outer sheath layer comprises the following components in parts by weight:
by adopting the technical scheme, the outer sheath layer is obtained by the following method:
weighing and mixing the raw materials according to the parts by weight, transferring the mixture into a double-screw extruder for extrusion processing, and granulating and molding at 120-140 ℃ to obtain the outer sheath material;
wherein the temperature during extrusion processing is 120-170 ℃, and the rotation speed of the screw is 50-500 r/min.
By adopting the technical scheme, the compatilizer is maleic anhydride grafted EVA.
By adopting the technical scheme, the superfine composite flame retardant comprises aluminum hydroxide and magnesium hydroxide, wherein the ratio of the aluminum hydroxide to the magnesium hydroxide is 1: 1 to 1.5.
By adopting the technical scheme, the composite lubricant comprises zinc stearate and hydroxyl silicone oil, wherein the ratio of the zinc stearate to the hydroxyl silicone oil is 1: 0.5 to 1.5.
By adopting the technical scheme, the antioxidant is hindered phenol antioxidant.
According to the technical scheme, the oxygen isolation layer is made of ceramic polyolefin, and ceramic powder is added into the ceramic polyolefin.
According to the technical scheme, the cable core comprises a conductor and an insulating layer arranged outside the conductor, and a filling layer is filled in a gap of the cable core.
Another object of the present invention is to provide a process for manufacturing the B1 control cable for power equipment, including:
the method comprises the steps of coating a crosslinked polyethylene insulating material on the outer surface of a conductor to form an insulating layer to obtain a cable core, coating a high-flame-retardant wrapping belt on the outer surface of the cable core to form a wrapping layer, weaving a copper wire to form a shielding material on the outer surface of the wrapping layer to form the shielding layer, coating a ceramic polyolefin material added with ceramic powder on the outer surface of the shielding layer to form an oxygen separation layer, coating a double-layer galvanized steel strip on the outer surface of the oxygen separation layer to form a metal armor layer, coating an outer sheath on the outer surface of the metal armor layer to form the outer sheath layer, and filling a gap between the cable core with a flame-retardant high-temperature filling rope to form the filling layer.
By adopting the technical scheme, the oxygen isolation layer and the outer sheath layer adopt a semi-extrusion process, the material stretching length is less than or equal to 12cm, the screw compression ratio is 1.15-1.20, and the screw length-diameter ratio is 20-25.
The invention has the beneficial effects that: according to the invention, the oxygen-insulating layer and the outer sheath layer structure are arranged outside the shielding layer, and the wrapping layers are matched between the layer structures, so that the cable can pass a B1-level combustion test and a bundled A-type flame retardant test; and the base material of the outer sheath layer mainly comprises polyethylene, polyolefin elastomer and ethylene-vinyl acetate copolymer resin, on the premise of ensuring that the physical and mechanical properties of the outer sheath layer meet the product standard, the components of the polyethylene are properly reduced, the ethylene-vinyl acetate copolymer resin with lower ethylene content is selected, and the ultra-fine composite flame retardant is added to promote the dehydration and carbonization of the polymer to form a carbon layer with certain thickness and strength, so that the functions of blocking combustion and preventing dripping are realized.
Drawings
Fig. 1 is a schematic structural diagram of a B1 control cable for a power plant according to the present invention.
FIG. 2 is a schematic diagram showing the mixture ratio of the components of the outer sheath layer in examples 1 to 3 of the present invention in parts by weight.
FIG. 3 is a schematic diagram showing the composition ratio of the outer sheath layer in comparative examples 1 to 2 in parts by weight.
FIG. 4 is a graph of performance test data for each of the examples and comparative outer jacket layers.
The reference numbers in the figures illustrate: 1. a conductor; 2. an insulating layer; 3. a filling layer; 4. wrapping a covering; 5. a shielding layer; 6. an oxygen barrier layer; 7. a metal armor layer; 8. an outer jacket layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Examples 1 to 3: a B1 level control cable for power equipment is structurally characterized by referring to fig. 1, the structure of the control cable can comprise a cable core, a shielding layer 5, a metal armor layer 7 and an outer sheath layer 8 which are sequentially arranged from inside to outside, a wrapping layer 4 is arranged between the cable core and the shielding layer 5, an oxygen separation layer 6 is arranged between the shielding layer 5 and the metal armor layer 7, and the outer sheath layer 8 is arranged outside the metal armor layer 7. The cable core comprises a conductor 1 and an insulating layer 2 arranged outside the conductor 1, and a filling layer 3 is filled in the gap of the cable core.
The conductor 1 of the B1-grade control cable for the power equipment is the 1 st annealed copper conductor 1, or the insulating layer 2 is the insulating layer 2 made of cross-linked polyethylene insulating material, or the filling layer 3 is a flame-retardant high-temperature filling rope, or the wrapping layer 4 is a high-flame-retardant wrapping tape wrapped outside the cable core, or the shielding layer 5 is a copper wire braided shielding layer 5, or the oxygen isolation layer 6 is the oxygen isolation layer 6 made of ceramic polyolefin extrusion wrapping added with ceramic powder, or the metal armor layer 7 is an armor layer made of double-layer galvanized steel tape gap wrapping, or the outer jacket layer 8 is the outer jacket layer 8 made of outer jacket material.
And the oxygen isolation layer 6 is made of high heat insulation ceramic polyolefin, a large amount of ceramic powder is added into the high heat insulation ceramic polyolefin, the oxygen isolation layer has low combustion heat value, and a closed porous ceramic structure is generated by ceramic under the ablation of flame at about 550 ℃, so that a good heat insulation effect can be achieved. Meanwhile, a large amount of heat is absorbed in the low-temperature vitrification reaction process, the temperature of the insulated cable core is effectively reduced, and the heat release rate and the total heat release amount of the cable are effectively reduced.
The oxygen isolation layer 6 is used for protecting the cable core on one hand, preventing the outer sheath from being burnt through and then directly burning the cable core by flame, and on the other hand, is used for isolating the gas generated by thermal decomposition, and preventing the internal gas from leaking to damage the outer sheath layer 8 to form burning drips.
Examples 1 to 3: a manufacturing process of a B1-level control cable for power equipment comprises the following steps:
the method comprises the steps of coating a crosslinked polyethylene insulating material on the outer surface of a conductor to form an insulating layer to obtain a cable core, coating a high-flame-retardant wrapping belt on the outer surface of the cable core to form a wrapping layer, weaving a copper wire to form a shielding material on the outer surface of the wrapping layer to form the shielding layer, coating a ceramic polyolefin material added with ceramic powder on the outer surface of the shielding layer to form an oxygen separation layer, coating a double-layer galvanized steel strip on the outer surface of the oxygen separation layer to form a metal armor layer, coating an outer sheath on the outer surface of the metal armor layer to form the outer sheath layer, and filling a gap between the cable core with a flame-retardant high-temperature filling rope to form the filling layer.
The oxygen isolation layer 6 and the outer sheath layer 8 adopt a semi-extrusion type process, the extrusion pressure of materials is improved through a special structure of a semi-extrusion type die, and the stretching length of the materials is controlled to be not more than 12 cm. As the sheath material is filled greatly, in order to avoid friction overheating in the machine barrel, a single-thread screw with a low compression ratio is selected, the compression ratio of the screw is controlled to be 1.15-1.20, the length-diameter ratio of the screw is controlled to be 20-25, and the aperture of the filter plate is controlled to be phi 10-25, so that the extrusion pressure is controlled, and the current stability is ensured. In addition, a vacuum pump is arranged in front of the machine head to vacuumize the cable core, so that negative pressure is formed after the cable core enters the machine head. The gaps at the interface are reduced to the maximum extent by the two measures, and the cable is ensured to pass a B1-grade combustion test and a bundled A-type flame-retardant test.
Wherein, the outer sheath layer 8 consists of the following components in parts by weight:
the ethylene-vinyl acetate copolymer resin (EVA) contains 40% of ethylene (VA), the compatilizer is maleic anhydride grafted EVA (EVA-g-MA), the EVA-g-MA is used as a coupling agent and a dispersion promoter, so that the superfine composite flame retardant is dispersed in the resin more uniformly, and the superfine composite flame retardant is superfine magnesium hydroxide and aluminum hydroxide and is dispersed in the resin more uniformly. The ceramic zinc borate generates zinc oxide in the combustion process to promote the formation of a charring agent, and can promote the charring and form ceramic in a flame-retardant system consisting of magnesium hydroxide and aluminum hydroxide, thereby playing the roles of smoke suppression, flame retardance and dripping resistance. And the ceramic zinc borate/aluminum hydroxide/magnesium hydroxide has a synergistic effect and excellent flame retardant property.
The composite reinforcing agent generally adopts 2 materials, which can be carbon black, white carbon black, acetylene black or diatomite, and the mixture ratio is generally 1: 1.5-2; the compound lubricant is generally selected from zinc stearate and hydroxyl silicone oil, and the proportion of the zinc stearate to the hydroxyl silicone oil is generally 1: 0.5 to 1.5; the superfine composite flame retardant is generally selected from aluminum hydroxide and magnesium hydroxide, and the proportion of the superfine composite flame retardant is generally 1: 1 to 1.5; the antioxidant is generally selected from hindered phenol antioxidant, and can be antioxidant 1076, antioxidant 264 or antioxidant 1010.
The base material of the outer sheath layer 8 mainly comprises polyethylene, polyolefin elastomer and ethylene-vinyl acetate copolymer resin, the combustion heat value of the polyethylene is generally 46kJ/kg, the combustion heat value of the ethylene-vinyl acetate copolymer resin is increased along with the increase of the ethylene content, the heat value is generally 23kJ/kg when the ethylene content is zero, on the premise that the physical and mechanical properties of the outer sheath layer 8 meet the product standard, the components of the polyethylene are properly reduced, the ethylene-vinyl acetate copolymer resin with lower ethylene content is selected, and the polymer is promoted to be dehydrated and carbonized by adding the superfine composite flame retardant, so that a carbon layer with certain thickness and strength is formed, and the functions of blocking combustion and preventing dripping are realized.
The outer jacket layer 8 controls the propagation distance of the flame and the amount of heat released from the outer jacket layer 8 when subjected to a flame ignition of 20.5 kW. The B1 level combustion test has strict regulations on the air intake of the test box and the exhaust flow of the exhaust pipe, the air intake requirement is controlled to be 8000 +/-400L/min, the exhaust flow requirement is controlled to be 1.0 +/-0.05 m3/s, so that an air flow from bottom to top is formed in the test box, the air flow has a great combustion-supporting effect, if the gap between the cable outer sheath layer 8 and the cable core is large, the air can burst the outer sheath layer 8 when heated, and after the flame burns through the outer sheath layer 8, the hot air flow from bottom to top can longitudinally spread along the interior of the cable, so that the flame spreads to the inner layer along the outer sheath layer 8, and the combustion is intensified.
The above-described outer jacket layer 8 is obtained by the following method:
weighing and mixing the raw materials according to the parts by weight, transferring the mixture into a double-screw extruder for extrusion processing, and granulating and molding at 120-140 ℃ to obtain the outer sheath material; wherein the temperature during extrusion processing is 120-170 ℃, and the rotation speed of the screw is 50-500 r/min.
The direct current resistance of the conductor 1 at 20 ℃ of the prepared B1-grade control cable meets the regulation of GB/T3956-.
The prepared B1-grade control cable simultaneously has B1 combustion performance and bundled A-grade flame retardant performance, wherein the B1-grade combustion performance of the cable is determined according to a test method specified in GB 31247-2014, and the result meets the classification criterion of B1 grade; the burning drop/particle grade meets d0 grade, namely no burning drop/particle within 1200 s; the smoke toxicity grade meets t0 grade, namely reaching ZA2 grade; the corrosivity level meets a1 level, namely the conductivity is less than or equal to 2.5 mu s/mm, and the PH is more than or equal to 4.3; bundled class a flame retardant properties of the cable: the charring height of the cable is not greater than 2.5m, as measured according to the test method specified in GB/T18380.33.
The electrical performance and the mechanical physical performance of the prepared B1-grade control cable meet the regulations of GB/T9330-2008 standard.
Examples 1 to 3: the outer jacket layer 8 is composed of the components in parts by weight shown in fig. 2.
The antioxidant of example 1 was antioxidant 1076, the antioxidant of example 2 was antioxidant 264, and the antioxidant of example 3 was antioxidant 1010.
The compatibilizers of examples 1 to 3 were all maleic anhydride-grafted EVA (EVA-g-MA).
The outer sheath layer 8 is manufactured by the above method, and the present invention is not described herein.
Comparative examples 1 to 2: the outer jacket layer 8 is composed of the components in parts by weight shown in fig. 3.
The antioxidant of comparative example 1 was antioxidant 1076, and the antioxidant of comparative example 2 was antioxidant 264.
The compatibilizer in comparative examples 1-2 was maleic anhydride grafted polyethylene.
The preparation method is a conventional method.
The performance test data for each example and each comparative example prepared outer jacket layer 8 are shown in fig. 4.
The total heat release, heat release rate, smoke release rate and total smoke generation in the figure are tested according to ISO 5660-1 standard.
As shown in the evaluation results of fig. 4, the heat release rate and the smoke release rate of the outer sheath layer 8 of the control cable of class B1 in the example of the present invention are lower than those of the outer sheath layer 8 in the comparative example, and the total heat release and the total smoke generation are much lower than those of the outer sheath layer 8 in the comparative example, which proves that the control cable of class B1 burns slowly and releases less heat and smoke under fire conditions, so that the burning rate of the control cable of class B1 in the present invention is much lower than that of the existing control cable.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A B1 level control cable for power equipment is characterized in that: the cable comprises a cable core, a shielding layer, a metal armor layer and an outer sheath layer which are sequentially arranged from inside to outside, wherein a wrapping layer is arranged between the cable core and the shielding layer, an oxygen isolating layer is arranged between the shielding layer and the metal armor layer, and the outer sheath layer is arranged outside the metal armor layer;
the outer sheath layer comprises the following components in parts by weight:
2. the class B1 control cable for a power plant of claim 1, wherein: the outer sheath layer is obtained by the following method:
weighing and mixing the raw materials according to the parts by weight, transferring the mixture into a double-screw extruder for extrusion processing, and granulating and molding at 120-140 ℃ to obtain the outer sheath material;
wherein the temperature during extrusion processing is 120-170 ℃, and the rotation speed of the screw is 50-500 r/min.
3. The class B1 control cable for a power plant of claim 1, wherein: the compatilizer is maleic anhydride grafted EVA.
4. The class B1 control cable for a power plant of claim 1, wherein: the superfine composite flame retardant comprises aluminum hydroxide and magnesium hydroxide, wherein the ratio of the aluminum hydroxide to the magnesium hydroxide is 1: 1 to 1.5.
5. The class B1 control cable for a power plant of claim 1, wherein: the composite lubricant comprises zinc stearate and hydroxyl silicone oil, wherein the ratio of the zinc stearate to the hydroxyl silicone oil is 1: 0.5 to 1.5.
6. The class B1 control cable for a power plant of claim 1, wherein: the antioxidant is hindered phenol antioxidant.
7. The class B1 control cable for a power plant of claim 1, wherein: the oxygen isolation layer is made of ceramic polyolefin, and ceramic powder is added into the ceramic polyolefin.
8. The class B1 control cable for a power plant of claim 1, wherein: the cable core comprises a conductor and an insulating layer arranged outside the conductor, and a filling layer is filled in a gap of the cable core.
9. The process for manufacturing a class B1 control cable for electric power equipment according to any one of claims 1 to 8, comprising:
the method comprises the steps of coating a crosslinked polyethylene insulating material on the outer surface of a conductor to form an insulating layer to obtain a cable core, coating a high-flame-retardant wrapping belt on the outer surface of the cable core to form a wrapping layer, weaving a copper wire to form a shielding material on the outer surface of the wrapping layer to form the shielding layer, coating a ceramic polyolefin material added with ceramic powder on the outer surface of the shielding layer to form an oxygen separation layer, coating a double-layer galvanized steel strip on the outer surface of the oxygen separation layer to form a metal armor layer, coating an outer sheath on the outer surface of the metal armor layer to form the outer sheath layer, and filling a gap between the cable core with a flame-retardant high-temperature filling rope to form the filling layer.
10. The manufacturing process of the B1-grade control cable for the power equipment as claimed in claim 9, wherein the oxygen barrier layer and the outer sheath layer are in a semi-extrusion process, the material stretching length is less than or equal to 12cm, the screw compression ratio is 1.15-1.20, and the screw length-diameter ratio is 20-25.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611449A (en) * | 2021-09-13 | 2021-11-05 | 江苏亨通电力电缆有限公司 | B2Grade flame-retardant cable and preparation method and application thereof |
| CN114539689A (en) * | 2022-03-02 | 2022-05-27 | 广东新亚光电缆股份有限公司 | Preparation method of variable frequency cable |
| CN115785555A (en) * | 2023-02-07 | 2023-03-14 | 中东线缆制造有限责任公司 | Aluminum alloy conductor crosslinked polyethylene insulation flame-retardant cable |
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