CN112397228A - B1-level single-phase alternating-current cable for electrified railway and preparation method thereof - Google Patents
B1-level single-phase alternating-current cable for electrified railway and preparation method thereof Download PDFInfo
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/04—Concentric cables
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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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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- 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
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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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
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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
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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
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/021—Features relating to screening tape per se
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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
- C08K3/18—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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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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
- 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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Abstract
The invention discloses a B1-level single-phase alternating current cable for an electrified railway, which comprises at least one conductor, wherein a conductor shielding layer is coated on the outer side of the conductor, an insulating layer and an insulating shielding layer are sequentially arranged on the outer side of the conductor shielding layer, the insulating layer and the insulating shielding layer are of a three-layer co-extrusion structure, a waterproof layer is wound on the outer side of the insulating shielding layer, a metal shielding layer is coated on the waterproof layer, a fire-resistant heat insulation layer is arranged on one side, opposite to the waterproof layer, of the metal shielding layer, the fire-resistant heat insulation layer comprises a fire-resistant wrapping layer and a heat insulation layer, the fire-resistant wrapping layer is arranged between the metal shielding layer and the heat insulation layer. The cable reduces the release amount of heat and smoke, can slow down the burning rate of the cable, ensures that the burning of the cable is controlled within a certain range within 20 minutes after a fire disaster occurs, and prolongs the escape time of personnel.
Description
Technical Field
The invention relates to a cable, in particular to a B1-grade single-phase alternating-current cable for an electrified railway and a preparation method thereof.
Background
According to the statistics of fire departments, the first 20 minutes after a fire disaster occurs is the gold time for people to escape, and the survival probability of people is very low when the time exceeds 20 minutes. The B1-level single-phase alternating-current cable for the electrified railway is used for a traction power supply system of the electrified railway and is mainly used as a feeder line from a traction substation to a contact network and a return line from a running rail to the traction substation; and (3) transmitting the converted 27.5kV single-phase alternating current to a contact network, and simultaneously introducing loop current in a traveling rail into a main transformer of a traction substation. The existing electrified railway 27.5kV single-phase alternating-current cable only considers the flame retardant characteristic, ignores the characteristics of the cable such as heat release characteristic and smoke release characteristic when burning under the fire condition, and can not meet the higher requirements of the urban rail transit department on fire safety. Therefore, how to provide a cable with low heat release and low smoke becomes an effort for those skilled in the art.
Disclosure of Invention
The invention aims to provide a B1-level single-phase alternating-current cable for an electrified railway, which reduces the release amount of heat and smoke, can slow down the combustion rate of the cable, ensures that the combustion of the cable is controlled within a certain range within 20 minutes after a fire occurs, and prolongs the escape time of personnel; another object of the present invention is to provide a method for preparing B1-grade single-phase ac cable for the above electrified railway.
In order to achieve the purpose, the invention adopts the technical scheme that: a B1-level single-phase alternating current cable for an electrified railway comprises at least one conductor, wherein the conductor is coated with a conductor shielding layer, the conductor shielding layer is sequentially provided with an insulating layer and an insulating shielding layer, the conductor shielding layer, the insulating layer and the insulating shielding layer are of a three-layer co-extrusion structure, the insulating shielding layer is wound with a waterproof layer, the waterproof layer is coated with a metal shielding layer, one side of the metal shielding layer, which is opposite to the waterproof layer, is provided with a fire-resistant heat insulation layer, the fire-resistant heat insulation layer comprises a fire-resistant wrapping layer and a heat insulation layer, the fire-resistant wrapping layer is arranged between the metal shielding layer and the heat insulation layer, the outer side of the fire-resistant heat insulation layer is sequentially provided with an armor layer and an outer protective layer from inside to outside,
the outer protective layer comprises the following components in parts by mass:
25-50 parts of ethylene-vinyl acetate copolymer resin,
75 to 100 parts of linear low density polyethylene,
1-3 parts of ammonium molybdate,
20-30 parts of melamine polyphosphate,
10-30 parts of montmorillonite,
10-20 parts of aluminum hydroxide,
10-20 parts of diatomite,
0.5 to 2 parts of 4,4' -diaminodiphenylmethane,
0.5 to 1 part of sodium stearate,
1-2 parts of molybdenum disulfide,
0.5 to 2 parts of 2,2 '-dihydroxy-4, 4' -dimethoxy benzophenone,
0.5-1 part of silane coupling agent.
The technical scheme of further improvement in the technical scheme is as follows:
1. in the scheme, the content of vinyl acetate in the ethylene-vinyl acetate copolymer resin is 30-35%.
2. In the scheme, the adding ratio of the ammonium molybdate to the 4,4' -diaminodiphenylmethane is 1-2: 1.
3. In the scheme, the addition ratio of the melamine polyphosphate to the aluminum hydroxide is 1-2.5: 1.
4. In the scheme, the silane coupling agent is diphenyl dimethoxysilane, triethoxysilane or 3-chloropropyl methyl dimethoxysilane.
5. In the scheme, the silane coupling agent is diphenyl dimethoxysilane, triethoxysilane or 3-chloropropyl methyl dimethoxysilane which are mixed according to the weight ratio of 5:3: 2.
The preparation method adopted by the invention has the technical scheme that: a method of making a B1 grade single phase ac cable for an electrified railway, the outer jacket being made by the steps of:
s1, mixing 25-50 parts of ethylene-vinyl acetate copolymer resin, 75-100 parts of linear low-density polyethylene and 20-30 parts of melamine polyphosphate by a high-speed mixer under a high-speed stirring state to form a mixture;
s2, reducing the rotating speed of the mixer to 500 rpm, adding 1-3 parts of ammonium molybdate, 0.5-2 parts of 4,4' -diaminodiphenylmethane, 0.5-1 part of sodium stearate, 1-2 parts of molybdenum disulfide, 0.5-2 parts of 2,2' -dihydroxy-4, 4' -dimethoxybenzophenone and 0.5-1 part of silane coupling agent into the mixture S1, and uniformly mixing;
s3, adjusting the rotating speed of the mixer to 800rpm, adding 10-20 parts of aluminum hydroxide, 10-20 parts of diatomite and 10-30 parts of montmorillonite again, and stirring and mixing uniformly;
and S4, transferring the mixed material in the S3 into a double-screw extruder for extrusion granulation, wherein the rotation speed of the screws is 200 rpm, so that an outer sheath material is obtained, and the prepared outer sheath material is coated on the periphery of the armor layer to obtain the cable.
The technical scheme of further improvement in the technical scheme is as follows:
in the scheme, the extrusion temperature of the twin-screw extruder in the step S4 is 110-175 ℃.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. according to the B1-level single-phase alternating-current cable for the electrified railway, the B1-level flame retardance of the cable is realized by arranging the flame-retardant fire-resistant wrapping layer, the heat-insulating layer, the armor layer and the outer protective layer outside the metal shielding layer, and meanwhile, the semi-conductive water-blocking tape structure is wrapped outside the insulating shielding layer, so that the cable has the radial waterproof characteristic; furthermore, the heat insulation layer is made of ceramic polyolefin material, the heat insulation layer can generate ceramic reaction under flame firing, a large amount of heat is absorbed in the reaction process, the temperature of the inner cable core can be effectively reduced, and the total heat release amount is reduced; meanwhile, a high-heat-insulation porous ceramic structure is generated, gas generated by thermal decomposition of the crosslinked wire core is sealed and locked, and the outer protective layer material is prevented from falling off due to gas leakage.
2. According to the B1-level single-phase alternating-current cable for the electrified railway, ammonium molybdate and 4,4' -diaminodiphenylmethane are added into ethylene-vinyl acetate copolymer resin, linear low-density polyethylene, melamine polyphosphate and aluminum hydroxide, so that the total heat release of an outer protective layer of the cable is low, the heat release rate and the smoke release rate are greatly reduced, the combustion rate of the cable is reduced, the combustion of the cable is controlled within a certain range within 20 minutes after a fire disaster occurs, the generation of heat and smoke in the fire scene can be reduced, the sheath material cannot drop, the escape time of personnel is prolonged, the survival probability of the personnel is improved, and the pollution to the environment is reduced.
Drawings
FIG. 1 is a schematic diagram of a B1 class single phase AC cable configuration for an electrified railroad of the present invention.
In the above drawings: 1. a conductor; 2. a conductor shield layer; 3. an insulating layer; 4. an insulating shield layer; 5. a waterproof layer; 6. a metal shielding layer; 7. a flame-retardant and fire-resistant wrapping layer; 8. a thermal insulation layer; 9. an armor layer; 10. an outer jacket.
Detailed Description
The invention is further described below with reference to the following examples:
examples 1 to 3: a B1-level single-phase alternating current cable for an electrified railway comprises at least one conductor 1, wherein a conductor shielding layer 2 is coated on the outer side of the conductor 1, an insulating layer 3 and an insulating shielding layer 4 are sequentially arranged on the outer side of the conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 are of a three-layer co-extrusion structure, a waterproof layer 5 is wound on the outer side of the insulating shielding layer 4, a metal shielding layer 6 is coated on the outer side of the waterproof layer 5, a fire-resistant insulating layer is arranged on one side, opposite to the waterproof layer 5, of the metal shielding layer 6, the fire-resistant insulating layer comprises a fire-resistant wrapping layer 7 and a heat-insulating layer 8, the fire-resistant wrapping layer 7 is arranged between the metal shielding layer 6 and the heat-insulating layer 8, an armor layer 9 and an outer protective layer 10 are sequentially arranged on the outer,
the outer sheath 10 is made by the following steps:
s1, mixing 25-50 parts of ethylene-vinyl acetate copolymer resin, 75-100 parts of linear low-density polyethylene and 20-30 parts of melamine polyphosphate by a high-speed mixer under a high-speed stirring state to form a mixture;
s2, reducing the rotating speed of the mixer to 500 rpm, adding 1-3 parts of ammonium molybdate, 0.5-2 parts of 4,4' -diaminodiphenylmethane, 0.5-1 part of sodium stearate, 1-2 parts of molybdenum disulfide, 0.5-2 parts of 2,2' -dihydroxy-4, 4' -dimethoxybenzophenone and 0.5-1 part of silane coupling agent into the mixture S1, and uniformly mixing;
s3, adjusting the rotating speed of the mixer to 800rpm, adding 10-20 parts of aluminum hydroxide, 10-20 parts of diatomite and 10-30 parts of montmorillonite again, and stirring and mixing uniformly;
s4, transferring the mixed material in the S3 into a double-screw extruder for extrusion granulation, wherein the rotation speed of a screw is 200 rpm, so that an outer sheath material is obtained, and the prepared outer sheath material is coated on the periphery of the armor layer 9 to obtain the cable;
the raw materials of the outer sheath 10 in the B1-grade single-phase ac cable for the electrified railway comprise the following corresponding components in parts by mass, as shown in table 1:
TABLE 1
Wherein the ethylene-vinyl acetate copolymer resin in example 1 has a vinyl acetate content of 30%, the ratio of ammonium molybdate to 4,4' -diaminodiphenylmethane is 2:1, the ratio of melamine polyphosphate to aluminum hydroxide is 2.5:1, and the silane coupling agent is diphenyldimethoxysilane;
the ethylene-vinyl acetate copolymer resin in example 2 had a vinyl acetate content of 35%, the ratio of ammonium molybdate to 4,4' -diaminodiphenylmethane was 1.5:1, the ratio of melamine polyphosphate to aluminum hydroxide was 1.3:1, and the silane coupling agent was 3-chloropropylmethyl-dimethoxysilane;
the ethylene-vinyl acetate copolymer resin in example 3 had a vinyl acetate content of 32%, the ratio of ammonium molybdate to 4,4' -diaminodiphenylmethane was 1.25:1, the ratio of melamine polyphosphate to aluminum hydroxide was 1.4:1, and the silane coupling agent was diphenyldimethoxysilane, triethoxysilane, or 3-chloropropylmethyldimethoxysilane, which were mixed in a ratio of 5:3:2 parts by weight.
Comparative examples 1 to 2: a B1-level single-phase alternating current cable for an electrified railway comprises at least one conductor 1, wherein a conductor shielding layer 2 is coated on the outer side of the conductor 1, an insulating layer 3 and an insulating shielding layer 4 are sequentially arranged on the outer side of the conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 are of a three-layer co-extrusion structure, a waterproof layer 5 is wound on the outer side of the insulating shielding layer 4, a metal shielding layer 6 is coated on the outer side of the waterproof layer 5, a fire-resistant insulating layer is arranged on one side, opposite to the waterproof layer 5, of the metal shielding layer 6, the fire-resistant insulating layer comprises a fire-resistant wrapping layer 7 and a heat-insulating layer 8, the fire-resistant wrapping layer 7 is arranged between the metal shielding layer 6 and the heat-insulating layer 8, an armor layer 9 and an outer protective layer 10 are sequentially arranged on the outer, the outer protective layer 10 consists of the following components in parts by weight:
TABLE 2
Comparative example the procedure was as in example.
The product properties of the B1-grade single-phase ac cables for electrified railways prepared in examples 1 to 3 and comparative examples 1 to 2 are shown in table 3:
TABLE 3
The total heat release, heat release rate and smoke release rate in the table were measured using ISO 5660-1 standard.
As shown in the evaluation results in table 3, the total heat release amount of the outer sheath of the B1 single-phase ac cable for the electrified railway of the present invention is much smaller than the total heat release amount of the outer sheath of the comparative example, and both the heat release rate and the smoke release rate are smaller than those of the outer sheath of the comparative example, which indicates that the outer sheath prepared by the present invention reduces the heat and smoke release amount, can slow down the combustion rate of the cable, ensures that the combustion of the cable is controlled within a certain range within 20 minutes after the fire occurs, and can reduce the generation of heat and smoke in the fire scene, i.e., prolong the escape time of people, improve the survival probability of people, and reduce the pollution to the environment.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. A B1-level single-phase alternating-current cable for an electrified railway, characterized in that: the cable comprises at least one conductor (1), wherein a conductor shielding layer (2) is coated outside the conductor (1), an insulating layer (3) and an insulating shielding layer (4) are sequentially arranged outside the conductor shielding layer (2), the insulating layer (3) and the insulating shielding layer (4) are of a three-layer co-extrusion structure, a waterproof layer (5) is wound outside the insulating shielding layer (4), a metal shielding layer (6) is coated outside the waterproof layer (5), a fireproof heat-insulating layer is arranged on one side of the metal shielding layer (6) opposite to the waterproof layer (5), the fireproof heat-insulating layer comprises a flame-retardant fireproof wrapping layer (7) and a heat-insulating layer (8), the flame-retardant fireproof wrapping layer (7) is arranged between the metal shielding layer (6) and the heat-insulating layer (8), and an armor layer (9) and an outer protective layer (10) are sequentially arranged outside the fireproof, the metal shielding layer (6), the armor layer (9) and the outer protective layer (10) are of a coaxial structure,
the outer protective layer comprises the following components in parts by mass:
25-50 parts of ethylene-vinyl acetate copolymer resin,
75 to 100 parts of linear low density polyethylene,
1-3 parts of ammonium molybdate,
20-30 parts of melamine polyphosphate,
10-30 parts of montmorillonite,
10-20 parts of aluminum hydroxide,
10-20 parts of diatomite,
0.5 to 2 parts of 4,4' -diaminodiphenylmethane,
0.5 to 1 part of sodium stearate,
1-2 parts of molybdenum disulfide,
0.5 to 2 parts of 2,2 '-dihydroxy-4, 4' -dimethoxy benzophenone,
0.5-1 part of silane coupling agent.
2. The electrified railroad B1-class single-phase ac cable of claim 1, wherein: the content of vinyl acetate in the ethylene-vinyl acetate copolymer resin is 30-35%.
3. The electrified railroad B1-class single-phase ac cable of claim 1, wherein: the adding proportion of the ammonium molybdate to the 4,4' -diaminodiphenylmethane is 1-2: 1.
4. the electrified railroad B1-class single-phase ac cable of claim 1, wherein: the addition ratio of the melamine polyphosphate to the aluminum hydroxide is 1-2.5: 1.
5. the electrified railroad B1-class single-phase ac cable of claim 1, wherein: the silane coupling agent is diphenyl dimethoxysilane, triethoxysilane or 3-chloropropyl methyl dimethoxysilane.
6. The electrified railroad B1-class single-phase ac cable of claim 1, wherein: the silane coupling agent is diphenyl dimethoxysilane, triethoxysilane or 3-chloropropyl methyl dimethoxysilane mixed according to the weight ratio of 5:3: 2.
7. A method for preparing a B1-grade single-phase alternating current cable for the electrified railway according to any one of claims 1 to 6, which is characterized by comprising the following steps: the outer jacket (10) is produced by the following steps:
s1, mixing 25-50 parts of ethylene-vinyl acetate copolymer resin, 75-100 parts of linear low-density polyethylene and 20-30 parts of melamine polyphosphate by a high-speed mixer under a high-speed stirring state to form a mixture;
s2, reducing the rotating speed of the mixer to 500 rpm, adding 1-3 parts of ammonium molybdate, 0.5-2 parts of 4,4' -diaminodiphenylmethane, 0.5-1 part of sodium stearate, 1-2 parts of molybdenum disulfide, 0.5-2 parts of 2,2' -dihydroxy-4, 4' -dimethoxybenzophenone and 0.5-1 part of silane coupling agent into the mixture S1, and uniformly mixing;
s3, adjusting the rotating speed of the mixer to 800rpm, adding 10-20 parts of aluminum hydroxide, 10-20 parts of diatomite and 10-30 parts of montmorillonite again, and stirring and mixing uniformly;
and S4, transferring the mixed material in the S3 into a double-screw extruder for extrusion granulation, rotating the screw at the speed of 200 rpm to obtain an outer sheath material, and coating the outer periphery of the armor layer (9) with the prepared outer sheath material to obtain the cable.
8. The method of making a B1 grade single phase ac cable for an electrified railroad of claim 7, wherein: the extrusion temperature of the twin-screw extruder in the step S4 is 110-175 ℃.
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Cited By (1)
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| CN115181418A (en) * | 2022-09-13 | 2022-10-14 | 广东南缆电缆有限公司 | B1-grade flame-retardant wrapping tape and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115181418A (en) * | 2022-09-13 | 2022-10-14 | 广东南缆电缆有限公司 | B1-grade flame-retardant wrapping tape and preparation method and application thereof |
| CN115181418B (en) * | 2022-09-13 | 2022-11-22 | 广东南缆电缆有限公司 | B1-grade flame-retardant wrapping tape and preparation method and application thereof |
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Application publication date: 20210223 |