CN109206786A - A kind of high-flame-retardant polyvinyl and preparation method thereof - Google Patents
A kind of high-flame-retardant polyvinyl and preparation method thereof Download PDFInfo
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- CN109206786A CN109206786A CN201810982872.0A CN201810982872A CN109206786A CN 109206786 A CN109206786 A CN 109206786A CN 201810982872 A CN201810982872 A CN 201810982872A CN 109206786 A CN109206786 A CN 109206786A
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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
- C08L27/04—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 chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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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
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
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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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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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- 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
- C08L2205/24—Crystallisation aids
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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Abstract
The present invention relates to a kind of high-flame-retardant polyvinyls and preparation method thereof, in parts by weight, including 80-100 parts of polyvinyl chloride, 15-20 parts of high density polyethylene (HDPE), 3-5 parts of epoxidized soybean oil, 10-15 parts of pentaerythritol oleate, 5-8 parts of chlorinated paraffin, modified magnalium hydrotalcite 3-8 parts, 1-2 parts of zinc borate, 8-10 parts of smoke suppressant, 3-5 parts of heat stabilizer, 0.5-1.0 parts of lubricant, 8-10 parts of filler.The present invention improves particle dispersion degree so that the hydrophobicity on magnalium hydrotalcite surface enhances using modified magnalium hydrotalcite, disperses magnalium hydrotalcite in the material more evenly, and flame retardant property enhancing flame retardant property is obviously improved；Improve the compatibility and dispersibility of magnalium hydrotalcite, when material is stretched, modified magnalium hydrotalcite particle plays the role of crosslinking points, keep stress distribution uniform, the modification magnalium hydrotalcite of addition also can be used as nucleating agent, heterogeneous nucleating effect enhancing to material, the mechanical property for increasing composite material improve, and stretching, bending and impact strength, which have, to be improved.
Description
Technical field
The present invention relates to a kind of high-flame-retardant polyvinyls and preparation method thereof, belong to cable material field.
Background technique
With the fast development of global economy and the enhancing of mankind's environmental consciousness, each field to the quality of wire and cable and
The requirement of performance is higher and higher, because electric wire, cable aging due to the fire that causes it is also more and more, how to reduce the generation of fire
Rate and occur fire when the death rate, low cigarette, Halogen, it is fire-retardant, environmentally friendly also become wires and cables industry developing direction.Wherein
The demand of halide-free low-smoke fireproof cable material is increasing, and the production of halide-free low-smoke fireproof cable material at present is in polyolefin mostly
A large amount of magnesium hydroxide or aluminium hydroxide are added in substrate to reach flame retardant effect.Most study is exactly with thermoplasticity or crosslinking
Resin be substrate, such as containing chlorine or fluorine-containing resin, particularly polyvinyl chloride (PVC).PVC itself is also inherent flame retardant material,
Its oxygen index (OI) is very high, and flame retardant effect is fine, but pure PVC is rigid chain segment, begins to decompose at 90 DEG C or more, and processing will add
Enter plasticizer, plasticizer is all combustibles, so flexible PVC must be added fire retardant and just have flame retardant effect.And above-mentioned common height
Molecular material, in order to reach the requirement of fire-resistant cable material, it is necessary to fire retardant be added.Hydroxide flame retardant is mainly aluminium hydroxide
(ATH), magnesium hydroxide (MDH), fire-retardant principle are as follows: 1) decomposed in burning, wherein the decomposition temperature of aluminium hydroxide is 200-300
DEG C, the decomposition temperature of magnesium hydroxide is 340-490 DEG C；Dehydration occurs after decomposition, absorbs the big calorimetric of polymer surface
Amount, can reduce incendiary material surface temperature；It is dehydrated simultaneously and generates a large amount of vapor, dilute fuel gas and oxygen concentration.2) divide
Solving residue Mg O and Al2O3 is fine and close oxide, they are deposited on polymer surface, limit the life of fuel gas
At, play the role of heat-insulated, starvation, and achieved the effect that press down cigarette；And aluminium hydroxide and magnesium hydroxide can be absorbed
Sour gas.Magnesium hydroxide can promote polymer surface charing, and starvation is contacted with high molecular material, and aluminium hydroxide
Then without this effect；Therefore under identical additive amount, the flame retardant effect of magnesium hydroxide is significantly better than aluminium hydroxide.But magnesium hydroxide with
The compatibility of high molecular material is good not as good as aluminium hydroxide.The flame retarding efficiency of hydroxide is not high, to reach certain oxygen index (OI) or resistance
Fuel efficiency fruit needs big additional amount.This can bring many negative effects: burning generates drip phenomenon；Influence material mechanics and
Electric property；With the consistency problem of high molecular material；Processing fluidity can be made to be deteriorated, cause to process bad.
Summary of the invention
The present invention provides a kind of high-flame-retardant polyvinyls and preparation method thereof, solve existing inorganic fire-retarded electricity
Cable material flame retarding efficiency it is not high and with the consistency problem with high molecular material, influence mechanics and electric property of material etc. and ask
Topic.
In order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of high-flame-retardant polyvinyl, in parts by weight, including 80-100 parts of polyvinyl chloride, high-density polyethylene
15-20 parts of alkene, 3-5 parts of epoxidized soybean oil, 10-15 parts of pentaerythritol oleate, 5-8 parts of chlorinated paraffin, modified magnalium hydrotalcite
3-8 parts, 1-2 parts of zinc borate, 8-10 parts of smoke suppressant, 3-5 parts of heat stabilizer, 0.5-1.0 parts of lubricant, 8-10 parts of filler.
Further, a preferred embodiment of the present invention: the modification magnalium hydrotalcite obtains the preparation method comprises the following steps: weighing 20g
Magnalium hydrotalcite is added in 100ml water, ultrasonic 5-10min, is then heated to 80 DEG C, and 1gSTPP, 0.2g poly alkyl alcohol is added
Ethylene oxide ether and 0.3g octadecylamine hydrochloride, ultrasonic 15-20min, washing filter, and 100 DEG C of dry 8-10h are to get modified magnalium
Hydrotalcite.
Further, a preferred embodiment of the present invention: the smoke suppressant is molybdenum trioxide, in zinc molybdate, ammonium octamolybdate
One or more kinds of mixtures.
Further, a preferred embodiment of the present invention: the heat stabilizer is calcium zinc stabilizer.
Further, a preferred embodiment of the present invention: the lubricant is polyethylene wax.
Further, a preferred embodiment of the present invention: the filler is calcium carbonate.
A kind of preparation method of high-flame-retardant polyvinyl of the invention, comprising the following steps:
(1) by polyvinyl chloride, high density polyethylene (HDPE), epoxidized soybean oil, pentaerythritol oleate, chlorinated paraffin, modified magnesium
Aluminum hydrotalcite, zinc borate, smoke suppressant, heat stabilizer, lubricant, filler are sequentially placed into mixing machine and are kneaded, mix temperature 70-
80 DEG C, revolving speed 200-300r/min, mix time 8-10min；
(2) double screw extruder is added in the material after mixing, melting extrusion is granulated, and extruder temperature of each section is when extrusion
180-200 DEG C, screw speed 200-300r/min, feeder revolving speed is 10-60r/min, obtains the high fire-retardance polychlorostyrene second
Alkene CABLE MATERIALS.
Beneficial effects of the present invention:
It is inorganic fire-retarded for high polymer it is fire-retardant when, due to its poor compatibility between matrix resin and flame retarding efficiency
Low, for the requirement for making the flame retardant property of polyolefine material reach certain, the additive amount of hydroxide usually requires more than 50%, to material
The Effect on Mechanical Properties of material is very big.The present invention is using modified magnalium hydrotalcite, so that the hydrophobicity on magnalium hydrotalcite surface enhances,
Particle dispersion degree is improved, disperses magnalium hydrotalcite in the material more evenly, flame retardant property enhancing flame retardant property is obviously improved；
The compatibility and dispersibility for improving magnalium hydrotalcite, when material is stretched, modified magnalium hydrotalcite particle plays friendship
The effect for joining point, keeps stress distribution uniform.Meanwhile the modification magnalium hydrotalcite of addition also can be used as nucleating agent, to the different of material
The enhancing of phase nucleation, refines its crystal grain more, and the mechanical property for increasing composite material improves, stretching, bending and impact strength
With raising.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical solution of the present invention is clearly and completely described, it is clear that institute
The embodiment of description is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this hair
The range of bright protection.
Embodiment 1
A kind of high-flame-retardant polyvinyl, in parts by weight, including 80 parts of polyvinyl chloride, high density polyethylene (HDPE) 20
Part, 3 parts of epoxidized soybean oil, 15 parts of pentaerythritol oleate, 5 parts of chlorinated paraffin, modified 8 parts of magnalium hydrotalcite, 1 part of zinc borate,
8 parts of smoke suppressant, 3 parts of heat stabilizer, 0.5 part of lubricant, 10 parts of filler.
Polyvinyl chloride uses the PVC S-1000 of Shandong QiLu Petrochemical Engineering Co., Ltd, and high density polyethylene (HDPE) uses Shanghai
The SH850 of petrochemical industry.Polyethylene wax uses the polyethylene wax of EUROCERAS company: 2E.
Modified magnalium hydrotalcite obtains to be added in 100ml water the preparation method comprises the following steps: weighing 20g magnalium hydrotalcite, ultrasonic 5min,
Ultrasonic power 800W is then heated to 80 DEG C, and 1gSTPP, 0.2g fatty alcohol polyoxyethylene ether and 0.3g octadecylamine hydrochloric acid is added
Salt, ultrasonic 15min, ultrasonic power 800W, washing filter, and 100 DEG C of dry 8h are to get modified magnalium hydrotalcite.
Smoke suppressant is molybdenum trioxide；Heat stabilizer is calcium zinc stabilizer；Lubricant is polyethylene wax；Filler is calcium carbonate.
Preparation method, comprising the following steps:
(1) by polyvinyl chloride, high density polyethylene (HDPE), epoxidized soybean oil, pentaerythritol oleate, chlorinated paraffin, modified magnesium
Aluminum hydrotalcite, zinc borate, smoke suppressant, heat stabilizer, lubricant, filler are sequentially placed into mixing machine and are kneaded, mix temperature 70
DEG C, revolving speed 300r/min mixes time 8min；
(2) double screw extruder is added in the material after mixing, melting extrusion is granulated, and extruder temperature of each section is when extrusion
180-200 DEG C, specifically: 180 DEG C of an area, 185 DEG C of 2nd area, 190 DEG C of 3rd area, 4th area to 9th area be 200 DEG C, 200 DEG C of head, spiral shell
Bar revolving speed is 200r/min, and feeder revolving speed is 10r/min, obtains the high-flame-retardant polyvinyl.
Embodiment 2
A kind of high-flame-retardant polyvinyl, in parts by weight, including 90 parts of polyvinyl chloride, high density polyethylene (HDPE) 18
Part, 4 parts of epoxidized soybean oil, 20 parts of pentaerythritol oleate, 6 parts of chlorinated paraffin, modified 6 parts of magnalium hydrotalcite, 2 parts of zinc borate,
9 parts of smoke suppressant, 4 parts of heat stabilizer, 0.8 part of lubricant, 8 parts of filler.
Modified magnalium hydrotalcite obtains to be added in 100ml water the preparation method comprises the following steps: weighing 20g magnalium hydrotalcite, ultrasonic 8min
Ultrasonic power 800W, 80 DEG C are then heated to, 1gSTPP, 0.2g fatty alcohol polyoxyethylene ether and 0.3g octadecylamine hydrochloric acid is added
Salt, ultrasonic 20min, ultrasonic power 800W, washing filter, and 100 DEG C of dry 10h are to get modified magnalium hydrotalcite.
Smoke suppressant is zinc molybdate；Heat stabilizer is calcium zinc stabilizer；Lubricant is polyethylene wax；Filler is calcium carbonate.
Preparation method, comprising the following steps:
(1) by polyvinyl chloride, high density polyethylene (HDPE), epoxidized soybean oil, pentaerythritol oleate, chlorinated paraffin, modified magnesium
Aluminum hydrotalcite, zinc borate, smoke suppressant, heat stabilizer, lubricant, filler are sequentially placed into mixing machine and are kneaded, mix temperature 80
DEG C, revolving speed 300r/min mixes time 8min；
(2) double screw extruder is added in the material after mixing, melting extrusion is granulated, and extruder temperature of each section is when extrusion
180-200 DEG C, specifically: 180 DEG C of an area, 185 DEG C of 2nd area, 190 DEG C of 3rd area, 4th area to 9th area be 200 DEG C, 200 DEG C of head, spiral shell
Bar revolving speed is 300r/min, and feeder revolving speed is 60r/min, obtains the high-flame-retardant polyvinyl.
Embodiment 3
A kind of high-flame-retardant polyvinyl, in parts by weight, including 100 parts of polyvinyl chloride, high density polyethylene (HDPE)
15 parts, 5 parts of epoxidized soybean oil, 13 parts of pentaerythritol oleate, 8 parts of chlorinated paraffin, modified 3 parts of magnalium hydrotalcite, zinc borate 2
Part, 10 parts of smoke suppressant, 5 parts of heat stabilizer, 1.0 parts of lubricant, 9 parts of filler.
Modified magnalium hydrotalcite obtains to be added in 100ml water the preparation method comprises the following steps: weighing 20g magnalium hydrotalcite, ultrasonic 8min,
Ultrasonic power 800W is then heated to 80 DEG C, and 1gSTPP, 0.2g fatty alcohol polyoxyethylene ether and 0.3g octadecylamine hydrochloric acid is added
Salt, ultrasonic 18min, ultrasonic power 800W, washing filter, and 100 DEG C of dry 9h are to get modified magnalium hydrotalcite.
Smoke suppressant is zinc molybdate；Heat stabilizer is calcium zinc stabilizer；Lubricant is polyethylene wax；Filler is calcium carbonate.
Preparation method, comprising the following steps:
(1) by polyvinyl chloride, high density polyethylene (HDPE), epoxidized soybean oil, pentaerythritol oleate, chlorinated paraffin, modified magnesium
Aluminum hydrotalcite, zinc borate, smoke suppressant, heat stabilizer, lubricant, filler are sequentially placed into mixing machine and are kneaded, mix temperature 80
DEG C, revolving speed 200r/min mixes time 10min；
(2) double screw extruder is added in the material after mixing, melting extrusion is granulated, and extruder temperature of each section is when extrusion
180-200 DEG C, specifically: 180 DEG C of an area, 185 DEG C of 2nd area, 190 DEG C of 3rd area, 4th area to 9th area be 200 DEG C, 200 DEG C of head, spiral shell
Bar revolving speed is 300r/min, and feeder revolving speed is 30r/min, obtains the high-flame-retardant polyvinyl.
Performance test
Performance indicator measurement:
Tensile strength and elongation are by GB/T1040.3-2006 progress test specimens；Hardness: it is measured by GB/T2411-2008
Hardness；Thermostabilization: thermostabilization is tested by GB/T 8815-2008；Melt index: GB/T3682-2000 is detected；Oxygen index (OI):
It is detected by GB/T 2406.2-2009；Volume resistance: GB/T 1410-2006 is pressed；Dielectric strength: GB/T 1408-1- is pressed
2006 method test；Thermal deformation: it is detected by GB/T8815-2008；Heat ageing: dumbbell plate is prepared, then sample is put into
24 hours dry in drier, aging chamber is adjusted to set temperature, sample is hung vertically in ageing oven well with hook hook by weighing
Middle part, sample mutual spacing be not less than 20mm, be at effective workspace, then according to setting time carry out aging,
After predetermined temperature and time-triggered protocol, sample taking-up is put back in drier immediately, takes out weighing after 24 hours dry.Then it measures
Aging post-tensioning intensity and elongation, and calculate change rate and weight-loss ratio.
According to above-mentioned standard, high-flame-retardant polyvinyl prepared by embodiment 1-3 is measured, specific data are seen below
Table.
Cross-linkable polyethylene insulation material of the invention has good fire-retardant new, inoxidizability and electrical as seen from the above table
Performance.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of high-flame-retardant polyvinyl, it is characterised in that: in parts by weight, including 80-100 parts of polyvinyl chloride,
15-20 parts of high density polyethylene (HDPE), 10-15 parts of pentaerythritol oleate, 5-8 parts of chlorinated paraffin, is modified 3-5 parts of epoxidized soybean oil
3-8 parts of magnalium hydrotalcite, 1-2 parts of zinc borate, 8-10 parts of smoke suppressant, 3-5 parts of heat stabilizer, 0.5-1.0 parts of lubricant, filler 8-
10 parts.
2. a kind of high-flame-retardant polyvinyl according to claim 1, it is characterised in that: the modification magnalium water
Talcum obtains to be added in 100ml water the preparation method comprises the following steps: weighing 20g magnalium hydrotalcite, and ultrasonic 5-10min is then heated to 80
DEG C, 1gSTPP, 0.2g fatty alcohol polyoxyethylene ether and 0.3g octadecylamine hydrochloride, ultrasonic 15-20min is added, washing filters,
100 DEG C of dry 8-10h are to get modified magnalium hydrotalcite.
3. a kind of high-flame-retardant polyvinyl according to claim 1, it is characterised in that: the smoke suppressant is three
Molybdenum oxide, zinc molybdate, mixture one or more kinds of in ammonium octamolybdate.
4. a kind of high-flame-retardant polyvinyl according to claim 1, it is characterised in that: the heat stabilizer is
Calcium zinc stabilizer.
5. a kind of high-flame-retardant polyvinyl according to claim 1, it is characterised in that: the lubricant is poly-
Ethylene waxes.
6. a kind of high-flame-retardant polyvinyl according to claim 1, it is characterised in that: the filler is carbonic acid
Calcium.
7. a kind of preparation method of high-flame-retardant polyvinyl as claimed in any one of claims 1 to 6, which is characterized in that
The following steps are included:
(1) by polyvinyl chloride, high density polyethylene (HDPE), epoxidized soybean oil, pentaerythritol oleate, chlorinated paraffin, modified magnalium water
Talcum, zinc borate, smoke suppressant, heat stabilizer, lubricant, filler are sequentially placed into mixing machine and are kneaded, mix temperature 70-80
DEG C, revolving speed 200-300r/min mixes time 8-10min；
(2) double screw extruder is added in the material after mixing, melting extrusion is granulated, and extruder temperature of each section is 180- when extrusion
200 DEG C, screw speed 200-300r/min, feeder revolving speed is 10-60r/min, obtains the high flame retardant polyvinyl chloride electricity
Cable material.
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Cited By (3)
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| CN111675863A (en) * | 2019-03-10 | 2020-09-18 | 苏州美昱高分子材料有限公司 | Ultrahigh flame-retardant low-smoke polyvinyl chloride modified polymer |
| CN113308072A (en) * | 2021-07-19 | 2021-08-27 | 天长市徽宁电器仪表厂 | Multi-core B1-level flame-retardant power cable |
| CN114864165A (en) * | 2022-03-30 | 2022-08-05 | 安徽华上电缆科技有限公司 | Cross-linked polyethylene insulated flame-retardant polyvinyl chloride sheathed variable frequency cable |
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| CN113308072A (en) * | 2021-07-19 | 2021-08-27 | 天长市徽宁电器仪表厂 | Multi-core B1-level flame-retardant power cable |
| CN114864165A (en) * | 2022-03-30 | 2022-08-05 | 安徽华上电缆科技有限公司 | Cross-linked polyethylene insulated flame-retardant polyvinyl chloride sheathed variable frequency cable |
| CN114864165B (en) * | 2022-03-30 | 2023-05-30 | 安徽华上电缆科技有限公司 | Crosslinked polyethylene insulating flame-retardant polyvinyl chloride sheath variable-frequency cable |
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