CN113363009B - Fireproof fire-resistant high-frequency special litz wire cable - Google Patents
Fireproof fire-resistant high-frequency special litz wire cable Download PDFInfo
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- CN113363009B CN113363009B CN202110641564.3A CN202110641564A CN113363009B CN 113363009 B CN113363009 B CN 113363009B CN 202110641564 A CN202110641564 A CN 202110641564A CN 113363009 B CN113363009 B CN 113363009B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
- H01B11/08—Screens specially adapted for reducing cross-talk
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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
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/18—Homopolymers or copolymers or tetrafluoroethene
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
- H01B11/10—Screens specially adapted for reducing interference from external sources
- H01B11/1033—Screens specially adapted for reducing interference from external sources composed of a wire-braided conductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
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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
- H01B7/02—Disposition of insulation
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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
- H01B7/184—Sheaths comprising grooves, ribs or other projections
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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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Abstract
The invention discloses a fireproof fire-resistant high-frequency special litz wire cable which comprises a cable core and is characterized in that: the cable core comprises an I-shaped silicon rubber framework, two sides of the silicon rubber framework are respectively provided with a conductor group, each conductor group comprises two litz wire conductors formed by twisting a plurality of enameled wires, and the outer sides of the litz wire conductors formed by twisting the enameled wires are covered with silicon rubber insulating layers; every the conductor group outside from inside to outside in proper order the cladding have the compound interior of pottery porcelain silica gel fire prevention around covering, wire woven shield, the cable core wraps up outward in proper order and has the compound outband of pottery porcelain silica gel fire prevention around covering, mica layer, fire prevention restrictive coating. The insulating layer and the framework of the invention both adopt the silicon rubber material with good high temperature resistance, can meet the requirement that the cable is used in a high-temperature environment with the working temperature of 180 ℃, and the use of the framework meets the requirements of firmness and dragging resistance of the cable.
Description
Technical Field
The invention relates to the field of cables, in particular to a fireproof fire-resistant litz wire high-frequency special cable.
Background
The high-frequency cable is used for transmitting high-frequency signals, and has a filtering effect and high-frequency signal attenuation due to the fact that the cable is provided with the distributed capacitors and the distributed inductors, so that the cable with small distributed capacitors and distributed inductors is required to transmit the high-frequency signals, the insulating and sheathing materials of the cable are all polyvinyl chloride, the cable cannot meet the requirement for use in high-temperature environments, and the firmness of the cable is not strong.
Polytetrafluoroethylene, commonly known as "plastic king", is a high molecular compound formed by polymerizing tetrafluoroethylene, and has excellent chemical stability, corrosion resistance, sealing property, high lubrication non-adhesiveness, electrical insulation property and good ageing resistance. Used as engineering plastics and can be made into polytetrafluoroethylene tubes, rods, belts, plates, films and the like. The material is generally applied to corrosion-resistant pipelines, containers, pumps, valves with higher performance requirements, radar manufacturing equipment, high-frequency communication equipment, radio equipment and the like; however, polytetrafluoroethylene can also produce highly toxic byproducts of fluorophosphorus, perfluoroisobutylene and the like during pyrolysis, so that it is very important to further improve the fire-resistant and temperature-resistant performance of the whole cable structurally and materially.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a fireproof fire-resistant litz wire high-frequency special cable.
The technical scheme adopted by the invention is as follows:
the utility model provides a fire prevention fire-resistant type litz wire high frequency special type cable, including the cable core, its characterized in that: the cable core comprises an I-shaped silicon rubber framework, two sides of the silicon rubber framework are respectively provided with a conductor group, each conductor group comprises two litz wire conductors formed by twisting a plurality of enameled wires, and the outer sides of the litz wire conductors formed by twisting the enameled wires are covered with silicon rubber insulating layers; every the conductor group outside from inside to outside in proper order the cladding have the compound interior of pottery porcelain silica gel fire prevention around covering, wire woven shield, the cable core wraps up outward in proper order and has the compound outband of pottery porcelain silica gel fire prevention around covering, mica layer, fire prevention restrictive coating.
Furthermore, fire prevention fire-resistant type litz wire high frequency special cable, its characterized in that: the enameled wire is formed by coating polyurethane on a 5-class copper conductor.
The fireproof sheath layer is prepared from the following raw materials in parts by weight:
6-9 parts of zinc hydroxystannate, 20-30 parts of silane coupling agent kh550, 2-3 parts of polyvinylpyrrolidone, 150 parts of polytetrafluoroethylene 130-one, 4-6 parts of pyromellitic dianhydride, 10-13 parts of lignin, 0.1-0.3 part of butyl tin mercaptide, 3-4 parts of bisphenol A phosphite ester, 20-30 parts of oxidized polyethylene wax and 1-2 parts of glyoxal.
The preparation method of the fireproof sheath layer material comprises the following steps:
(1) adding oxidized polyethylene wax into thionyl chloride which is 10-13 times of the weight of the oxidized polyethylene wax, uniformly stirring, adding pyromellitic dianhydride, raising the temperature to 50-60 ℃, and stirring for 100-130 minutes under heat preservation to obtain a polyethylene wax solution;
(2) adding polyvinylpyrrolidone into deionized water with the weight 20-30 times of that of the polyvinylpyrrolidone, raising the temperature to 70-75 ℃, keeping the temperature and stirring for 10-20 minutes, adding lignin, and stirring uniformly to obtain a lignin dispersion liquid;
(3) adding zinc hydroxystannate into a silane coupling agent kh550, and performing ultrasonic treatment for 10-20 minutes to obtain a silane dispersion liquid;
(4) adding polytetrafluoroethylene into absolute ethyl alcohol with the weight 3-4 times of that of the polytetrafluoroethylene, uniformly stirring, adding lignin dispersion liquid and glyoxal, carrying out ultrasonic treatment for 10-15 minutes, adding the silane dispersion liquid, raising the temperature to 80-85 ℃, keeping the temperature, stirring for 1-2 hours, cooling, and carrying out suction filtration to obtain a pretreatment master batch;
(5) and adding the pretreated master batch into the polyethylene wax solution, uniformly stirring, feeding into an ice-water bath, stirring for reaction for 4-6 hours, discharging, removing thionyl chloride by rotary evaporation, mixing with tin butyl mercaptide and bisphenol A phosphite ester, uniformly stirring, feeding into an extruder, melting, extruding and cooling to obtain the polyethylene wax.
The invention has the advantages that:
the insulating layer and the framework of the invention both adopt the silicon rubber material with good high temperature resistance, can meet the requirement that the cable is used in a high temperature environment with the working temperature of 180 ℃, the framework is used to meet the requirements of firmness and drag resistance of the cable, two conductor groups are separated by colleagues to ensure that the signal transmission of the cable is not interfered with each other, and the anti-interference capability of the cable is greatly enhanced and the high temperature resistance and flame retardant effect are further improved by combining the application of the metal wire braided shielding layer.
According to the invention, the polyethylene wax is subjected to acyl chlorination modification and then is subjected to blending reaction with the lignin dispersion liquid, so that effective compounding of lignin and polyethylene wax is realized, the dispersion compatibility of each raw material among polytetrafluoroethylene substrates is improved, and the toughness and strength of the finished material are improved; the zinc hydroxystannate added in the invention has good flame retardance and smoke suppression by matching with polytetrafluoroethylene plastic, and forms effective synergy with lignin by realizing effective dispersion in a silane coupling agent, and the lignin can form a stable carbon layer during combustion, thereby playing the effect of isolating high temperature of flame, effectively reducing the decomposition of organic matters and playing the good synergistic fireproof effect.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: the fireproof cable comprises a silicon rubber framework 1, an enameled wire 2, a silicon rubber insulating layer 3, a ceramic silica gel fireproof composite belt inner wrapping layer 4, a metal wire woven outer conductor 5, a ceramic silica gel fireproof composite belt outer wrapping layer 6, a mica layer 7 and a fireproof sheath layer 8.
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.
Example 1.
As shown in fig. 1, a fire-proof and fire-resistant litz wire high-frequency special cable comprises a cable core, wherein the cable core comprises an i-shaped silicon rubber framework 1, two sides of the silicon rubber framework 1 are respectively provided with a conductor group, each conductor group comprises two litz wire conductors formed by twisting a plurality of enameled wires 2, and the outer sides of the litz wire conductors formed by twisting the enameled wires 2 are covered with silicon rubber insulating layers 3; every conductor group outside from inside to outside in proper order the cladding have the compound interior of pottery porcelain silica gel fire prevention around covering 4, wire woven shield 5, the cable core wraps the compound outward of pottery silica gel fire prevention around covering, 6, mica layer 7, fire prevention restrictive coating 8 outward in proper order.
The enameled wire 2 is formed by coating polyurethane on a class 5 copper conductor.
The fireproof sheath layer 8 is made of the following raw materials in parts by weight:
6 parts of zinc hydroxystannate, a silane coupling agent kh55020 parts, 3 parts of polyvinylpyrrolidone, 150 parts of polytetrafluoroethylene, 6 parts of pyromellitic dianhydride, 13 parts of lignin, 0.3 part of butyl tin mercaptide, 4 parts of bisphenol A phosphite, 30 parts of oxidized polyethylene wax and 2 parts of glyoxal.
The preparation method of the material of the fireproof sheath layer 8 comprises the following steps:
(1) adding oxidized polyethylene wax into thionyl chloride 13 times of the weight of the oxidized polyethylene wax, uniformly stirring, adding pyromellitic dianhydride, raising the temperature to 60 ℃, and keeping the temperature and stirring for 130 minutes to obtain a polyethylene wax solution;
(2) taking polyvinylpyrrolidone, adding the polyvinylpyrrolidone into deionized water with the weight 30 times that of the polyvinylpyrrolidone, raising the temperature to 75 ℃, keeping the temperature, stirring for 20 minutes, adding lignin, and stirring uniformly to obtain a lignin dispersion liquid;
(3) adding zinc hydroxystannate into a silane coupling agent kh550, and performing ultrasonic treatment for 10 minutes to obtain a silane dispersion liquid;
(4) adding polytetrafluoroethylene into absolute ethyl alcohol with the weight 3 times that of the polytetrafluoroethylene, uniformly stirring, adding lignin dispersion liquid and glyoxal, carrying out ultrasonic treatment for 10 minutes, adding the silane dispersion liquid, raising the temperature to 80 ℃, keeping the temperature, stirring for 1 hour, cooling, and carrying out suction filtration to obtain a pretreatment master batch;
(5) and adding the pretreated master batch into the polyethylene wax solution, uniformly stirring, feeding into an ice-water bath, stirring for reaction for 6 hours, discharging, removing thionyl chloride by rotary evaporation, mixing with tin butylmercaptide and bisphenol A phosphite ester, uniformly stirring, feeding into an extruder, melting, extruding and cooling to obtain the polyethylene wax.
Example 2
As shown in fig. 1, the fireproof litz wire high-frequency special cable comprises a cable core, wherein the cable core comprises an i-shaped silicon rubber framework 1, two sides of the silicon rubber framework 1 are respectively provided with a conductor group, each conductor group comprises two litz wire conductors formed by twisting a plurality of enameled wires 2, and the outer sides of the litz wire conductors formed by twisting the enameled wires 2 are coated with silicon rubber insulating layers 3; every conductor group outside from inside to outside in proper order the cladding have the compound interior of pottery porcelain silica gel fire prevention to wind covering 4, wire woven shield 5, the cable core wraps the compound outward of pottery porcelain silica gel fire prevention in proper order and winds the covering, 6, mica layer 7, fire prevention restrictive coating 8 outward.
The enameled wire 2 is formed by coating polyurethane on a class 5 copper conductor.
The fireproof sheath layer 8 is made of the following raw materials in parts by weight:
9 parts of zinc hydroxystannate, 55030 parts of a silane coupling agent, 2 parts of polyvinylpyrrolidone, 130 parts of polytetrafluoroethylene, 4 parts of pyromellitic dianhydride, 10 parts of lignin, 0.1 part of butyl tin mercaptide, 3 parts of bisphenol A phosphite, 20 parts of oxidized polyethylene wax and 1 part of glyoxal.
The preparation method of the material of the fireproof sheath layer 8 comprises the following steps:
(1) adding oxidized polyethylene wax into thionyl chloride with the weight 10 times that of the oxidized polyethylene wax, uniformly stirring, adding pyromellitic dianhydride, raising the temperature to 50 ℃, and keeping the temperature and stirring for 100 minutes to obtain a polyethylene wax solution;
(2) adding polyvinylpyrrolidone into deionized water with the weight 20 times of that of the polyvinylpyrrolidone, raising the temperature to 75 ℃, keeping the temperature and stirring for 10 minutes, adding lignin, and uniformly stirring to obtain a lignin dispersion liquid;
(3) adding zinc hydroxystannate into a silane coupling agent kh550, and performing ultrasonic treatment for 15 minutes to obtain a silane dispersion liquid;
(4) adding polytetrafluoroethylene into absolute ethyl alcohol with the weight 3 times of that of the polytetrafluoroethylene, uniformly stirring, adding lignin dispersion liquid and glyoxal, carrying out ultrasonic treatment for 15 minutes, adding the silane dispersion liquid, raising the temperature to 80 ℃, keeping the temperature, stirring for 1 hour, cooling, and carrying out suction filtration to obtain a pretreatment master batch;
(5) and adding the pretreated master batch into the polyethylene wax solution, uniformly stirring, feeding into an ice-water bath, stirring for reaction for 4 hours, discharging, removing thionyl chloride by rotary evaporation, mixing with tin butylmercaptide and bisphenol A phosphite ester, uniformly stirring, feeding into an extruder, melting, extruding and cooling to obtain the polyethylene wax.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. The utility model provides a fire prevention fire-resistant type litz wire high frequency special type cable, including the cable core, its characterized in that: the cable core comprises an I-shaped silicon rubber framework, two sides of the silicon rubber framework are respectively provided with a conductor group, each conductor group comprises two litz wire conductors formed by twisting a plurality of enameled wires, and the outer sides of the litz wire conductors formed by twisting the enameled wires are covered with silicon rubber insulating layers; the outer side of each conductor group is sequentially coated with a ceramic silica gel fireproof composite inner wrapping layer and a metal wire braided shielding layer from inside to outside, and the cable core is sequentially coated with a ceramic silica gel fireproof composite outer wrapping layer, a mica layer and a fireproof sheath layer;
the fireproof sheath layer is prepared from the following raw materials in parts by weight:
6-9 parts of zinc hydroxystannate, 20-30 parts of silane coupling agent kh550, 2-3 parts of polyvinylpyrrolidone, 150 parts of polytetrafluoroethylene 130-one, 4-6 parts of pyromellitic dianhydride, 10-13 parts of lignin, 0.1-0.3 part of butyl tin mercaptide, 3-4 parts of bisphenol A phosphite ester, 20-30 parts of oxidized polyethylene wax and 1-2 parts of glyoxal;
the preparation method of the fireproof sheath layer material comprises the following steps:
(1) adding oxidized polyethylene wax into thionyl chloride with the weight 10-13 times that of the oxidized polyethylene wax, uniformly stirring, adding pyromellitic dianhydride, raising the temperature to 50-60 ℃, and keeping the temperature and stirring for 100-130 minutes to obtain a polyethylene wax solution;
(2) adding polyvinylpyrrolidone into deionized water with the weight of 20-30 times of that of polyvinylpyrrolidone, raising the temperature to 70-75 ℃, keeping the temperature and stirring for 10-20 minutes, adding lignin, and uniformly stirring to obtain a lignin dispersion liquid;
(3) adding zinc hydroxystannate into a silane coupling agent kh550, and performing ultrasonic treatment for 10-20 minutes to obtain a silane dispersion liquid;
(4) adding polytetrafluoroethylene into absolute ethyl alcohol with the weight 3-4 times of that of the polytetrafluoroethylene, uniformly stirring, adding lignin dispersion liquid and glyoxal, carrying out ultrasonic treatment for 10-15 minutes, adding the silane dispersion liquid, raising the temperature to 80-85 ℃, keeping the temperature, stirring for 1-2 hours, cooling, and carrying out suction filtration to obtain a pretreatment master batch;
(5) and adding the pretreated master batch into the polyethylene wax solution, uniformly stirring, feeding into an ice-water bath, stirring for reaction for 4-6 hours, discharging, removing thionyl chloride by rotary evaporation, mixing with tin butyl mercaptide and bisphenol A phosphite ester, uniformly stirring, feeding into an extruder, melting, extruding and cooling to obtain the polyethylene wax.
2. The fireproof and fire-resistant litz wire high-frequency special cable according to claim 1, characterized in that: the enameled wire is formed by coating polyurethane on a 5-class copper conductor.
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| CN202110641564.3A CN113363009B (en) | 2021-06-09 | 2021-06-09 | Fireproof fire-resistant high-frequency special litz wire cable |
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| CN113363009B true CN113363009B (en) | 2022-05-31 |
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| CN112679125B (en) * | 2021-01-20 | 2022-04-12 | 中建八局第二建设有限公司 | Construction waste modified silicon micropowder and preparation method thereof |
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2021
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| GB1459648A (en) * | 1973-07-30 | 1976-12-22 | Goodyear Tire & Rubber | Flame retardant thermoplastic polymer compositions |
| CN103304941A (en) * | 2013-05-14 | 2013-09-18 | 安徽旺达铜业发展有限公司 | Triphenyl phosphate modified cable sheathing compound |
| CN103345964A (en) * | 2013-07-01 | 2013-10-09 | 安徽虹都电缆集团有限公司 | Industrial heat-resisting fireproofing instrument cable and manufacturing technology thereof |
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| CN113363009A (en) | 2021-09-07 |
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