CN107945939B - Ethylene-propylene insulating water-blocking flame-retardant power flexible cable and preparation method thereof - Google Patents

Ethylene-propylene insulating water-blocking flame-retardant power flexible cable and preparation method thereof Download PDF

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Publication number
CN107945939B
CN107945939B CN201711434287.9A CN201711434287A CN107945939B CN 107945939 B CN107945939 B CN 107945939B CN 201711434287 A CN201711434287 A CN 201711434287A CN 107945939 B CN107945939 B CN 107945939B
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water
layer
flame
blocking
retardant
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CN107945939A (en
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于金花
周志浩
史敏峰
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WUXI MINGZHU CABLE CO Ltd
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WUXI MINGZHU CABLE CO Ltd
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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
    • 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
    • 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
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • 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
    • 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
    • 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
    • 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
    • H01B9/024—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of braided metal wire
    • 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

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses an ethylene-propylene insulating water-blocking and flame-retardant power flexible cable and a preparation method thereof, wherein the cable comprises a conductor, a first water-blocking layer and a second water-blocking layer are sequentially wrapped outside the conductor, and a cross-linked flame-retardant ethylene-propylene rubber insulating layer is extruded between the first water-blocking layer and the second water-blocking layer to form an insulating wire core; the first wrapping layer is arranged outside the second water-blocking layer, the metal shielding layer is arranged outside the first wrapping layer, the third water-blocking layer is wrapped outside the metal shielding layer, the second wrapping layer is arranged outside the third water-blocking layer, and finally the flame-retardant high-tearing-resistance chlorinated polyethylene rubber outer sheath is extruded outside the second wrapping layer. The cable is used for power connection of power transmission and distribution systems in narrow spaces such as high-rise buildings and subways, has excellent shielding performance, water resistance, flame retardance, bending resistance and the like, keeps smooth power transmission of the cable, and meets power supply requirements of environments such as narrow spaces and underground engineering.

Description

Ethylene-propylene insulating water-blocking flame-retardant power flexible cable and preparation method thereof
Technical Field
The invention relates to an ethylene-propylene insulating power flexible cable and a production method thereof, in particular to an ethylene-propylene insulating water-blocking flame-retardant power flexible cable and a production method thereof, and belongs to the technical field of cable preparation.
Background
In recent years, along with rapid development of Chinese economy and continuous acceleration of urban construction, rapid growth of urban high-rise buildings and rail transit industries is promoted, and electric power transmission and distribution network of the urban high-rise buildings and subways are generally narrow in laying environment and wet, so that higher requirements on flexibility, bending resistance and water blocking performance of cables are provided. Meanwhile, high-rise buildings and subway stations are dense in personnel and high in flame retardant requirement, so that the flame retardant property of the cable is very important.
The electric cable is especially necessary to develop an ethylene-propylene insulating water-blocking flame-retardant power flexible cable from the perspective of standing in the social responsibility of enterprises, safely producing and guaranteeing the safe power supply of urban high-rise buildings and subway power transmission and distribution systems.
Disclosure of Invention
In order to overcome the defects in the prior art, the ethylene-propylene insulating water-blocking flame-retardant power flexible cable is provided, is used for power connection of power transmission and distribution systems in narrow spaces such as high-rise buildings and subways, has excellent shielding performance, water-blocking, flame-retardant, bending-resistant and other performances, keeps smooth power transmission of the cable, and meets power supply requirements of environments such as narrow spaces and underground engineering.
The invention further aims to provide a preparation method of the ethylene-propylene insulating water-blocking flame-retardant power flexible cable.
In order to achieve the aim, the invention discloses an ethylene-propylene insulating water-blocking and flame-retardant power flexible cable which comprises a conductor, wherein a first water-blocking layer and a second water-blocking layer are sequentially wrapped outside the conductor, and a cross-linked flame-retardant ethylene-propylene rubber insulating layer is extruded between the first water-blocking layer and the second water-blocking layer to form an insulating wire core; the first wrapping layer is arranged outside the second water-blocking layer, the metal shielding layer is arranged outside the first wrapping layer, the third water-blocking layer is wrapped outside the metal shielding layer, the second wrapping layer is arranged outside the third water-blocking layer, and finally the flame-retardant high-tearing-resistance chlorinated polyethylene rubber outer sheath is extruded outside the second wrapping layer.
Preferably, the conductor is a type 5 soft copper conductor, the conductor is formed by layering and twisting a plurality of strand wires, each layer of strand wires is formed by combining a plurality of strand wires, the twisting directions of two adjacent layers are opposite, and a single-sided semiconductor water-resistant belt is wrapped between each two adjacent layers of strand wires.
Preferably, the first water-blocking layer, the second water-blocking layer and the third water-blocking layer are all semiconducting water-blocking strips.
Preferably, the first wrapping belt is a single-sided aluminum-plastic composite belt, and aluminum faces outwards.
Preferably, the second wrapping band is a nonwoven fabric.
Preferably, the metal shielding layer is formed by braiding tinned copper wires, and the braiding density is not less than 80%.
A preparation method of an ethylene-propylene insulating water-blocking and flame-retardant power flexible cable comprises the following steps:
1) Firstly, adopting a 5 th soft copper conductor, wherein the wire direction of each layer of strand of the multi-layer stranded conductor is opposite to the stranded direction, and a single-sided semiconductor water-resistant belt is wrapped between each layer of stranded layer, and water-blocking yarns are bundled;
2) Then overlapping the wrapped semiconductor water-resistance belt outside the conductor, wherein the overlapping rate is 20%;
3) Extruding and wrapping the crosslinked flame-retardant ethylene-propylene rubber outside the semiconductive water-blocking band through an extruding machine in a catenary continuous vulcanization rubber extruding production line, wherein the temperature of the extruding machine is controlled to be 70-90 ℃, the production line speed is controlled to be 5-10 m/min, the extruded wire core is heated in a sealed steam pipeline for continuous vulcanization, and the air pressure of the steam pipeline is controlled to be 0.9-1.2 MPa; after vulcanization, the cable is cooled by a water cooling pipeline to form an insulated cable core, and the temperature of the cooling section water is controlled at 30-50 ℃;
4) Secondly, overlapping the lapped semiconductor water-resistant belt outside the insulated wire core, wherein the overlapping rate is 20%;
5) Secondly, overlapping and wrapping a single-sided aluminum-plastic composite belt on the semiconductive water-blocking belt, wherein the aluminum faces outwards, and the overlapping rate is 20%;
6) Secondly, braiding a single-sided aluminum-plastic composite belt with tinned copper wires to form a metal shielding layer, wherein the braiding density is more than 80%;
7) Secondly, overlapping the lapped semiconductor water-resistant belt outside the metal shielding layer, wherein the overlapping rate is 20%;
8) Secondly, overlapping and wrapping non-woven fabrics outside the semiconductive water blocking band for binding, wherein the overlapping rate is 20%;
9) Secondly, extruding and wrapping the flame-retardant high-tearing-resistance chlorinated polyethylene rubber outside the non-woven fabric binding layer through an rubber extruder in a catenary continuous sulfur rubber extrusion production line, wherein the extrusion temperature is controlled at 75-88 ℃, the production line speed is controlled at 5-8 m/min, the wire core is heated and continuously vulcanized in a sealed steam pipeline, and the air pressure of the steam pipeline is controlled at 0.9-1.2 MPa; and cooling the cable through a water cooling pipeline after vulcanization, wherein the temperature of the cooling section water is controlled to be 30-50 ℃.
The crosslinked flame-retardant ethylene-propylene rubber insulating layer in the step 3) is prepared by mixing ethylene-propylene insulating rubber, an oxidant, a plasticizer, a vulcanizing agent, a reinforcing agent and an anti-aging agent through an internal mixer, and forming a sheet into a flame-retardant ethylene-propylene insulating rubber meeting continuous sulfur extrusion, wherein the flame-retardant ethylene-propylene insulating rubber comprises the following components in parts by mass: 100 parts of EPDM, 4-8 parts of ZnO, 5-8 parts of plasticizer, 2-3 parts of anti-aging agent, 50-75 parts of reinforcing filler, 3-5 parts of vulcanizing agent and 8-10 parts of flame retardant.
The flame-retardant high-tearing-resistance chlorinated polyethylene sheath rubber in the step 8) is prepared by mixing chlorinated polyethylene rubber, an oxidant, a plasticizer, a vulcanizing agent, a reinforcing agent and an anti-aging agent through an internal mixer and discharging into a sheet, wherein the flame-retardant high-tearing-resistance chlorinated polyethylene sheath rubber meets continuous sulfur extrusion, and comprises the following components in parts by mass: 100 parts of CPE, 6-12 parts of MgO, 15-20 parts of plasticizer, 2-3 parts of anti-aging agent, 60-80 parts of reinforcing filler, 20-30 parts of flame retardant and 4-6 parts of vulcanizing agent.
The invention has the beneficial effects that:
1. the invention adopts the layered water-blocking design of the cable conductor; the semiconductive water-resistant layers are arranged outside the cable conductor, outside the insulating layer and outside the metal shielding layer, so that the overall longitudinal water-resistant effect of the cable is ensured, the cable conductor is insulated, good electric field transition exists between the insulating layer and the metal shielding layer, and the water-resistant requirement and the use safety of the cable in a wet environment are effectively ensured; and through the scientific design to cable metal shielding structure, adopt plastic-aluminum composite tape and tinned braided copper wire to combine together and constitute the shielding layer, effectively guarantee cable complex environment electromagnetism, electric field shielding, ensure cable shielding effect.
2. The cable disclosed by the invention adopts a 5 th soft copper conductor, an ethylene-propylene elastomer insulating rubber, a tinned soft copper wire metal braid and a chlorinated polyethylene elastomer sheath rubber, and has excellent bending performance compared with the traditional crosslinked polyethylene insulating polyvinyl chloride sheath cable. In particular, after the chlorinated polyethylene elastomer sheath rubber is vulcanized and crosslinked, the chlorinated polyethylene elastomer sheath rubber has excellent elasticity and anti-S performance, has excellent bending resistance and drag resistance compared with a polyvinyl chloride sheath cable, and can meet the laying requirements of the cable in severe environments such as a high-rise building, a narrow space of an electric power transmission and distribution station of a subway and the like.
3. The invention adopts the insulating wire coreThe flame retardant ethylene propylene rubber has Oxygen Index (OI) of 26-28 and minimum volume resistivity of 1×10 15 The ethylene-propylene insulating rubber has good flame retardant property and keeps good insulating property.
4. The cable disclosed by the invention adopts the chlorinated polyethylene as the base material for flame-retardant and high-tearing-resistance elastomer rubber, the tensile strength of the sheath rubber is more than or equal to 11MPa, the elongation at break is more than or equal to 300%, the tearing resistance is more than or equal to 8.0N/mm, the oxygen index is more than or equal to 36, and compared with a thermoplastic polyvinyl chloride sheath, the chlorinated polyethylene sheath rubber after vulcanization crosslinking is excellent in elasticity, anti-S performance and wear resistance, and can meet the construction requirements of the cable in a narrow space and a severe environment of an electric power transmission and distribution station of a high-rise building and a subway.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural diagram of a conductor.
Detailed Description
The present invention is further illustrated in the accompanying drawings and detailed description which are to be understood as being merely illustrative of the invention and not limiting of its scope, and various modifications of the invention, which are equivalent to those skilled in the art upon reading the invention, will fall within the scope of the invention as defined in the appended claims.
As shown in fig. 1, the invention provides an ethylene-propylene insulating water-blocking and flame-retardant power flexible cable, which comprises a conductor 1, wherein a first water-blocking layer 2 and a second water-blocking layer 3 are sequentially overlapped and wrapped outside the conductor, the overlapping rate is 20%, and a cross-linked flame-retardant ethylene-propylene rubber insulating layer 4 is extruded and wrapped between the first water-blocking layer and the second water-blocking layer to form an insulating wire core; overlapping the first wrapping layer 5 of the wrapping bag outside the second water-blocking layer, wherein the overlapping rate is 20%; a metal shielding layer 6 is arranged outside the first wrapping layer, a third water blocking layer 7 is overlapped outside the metal shielding layer, and the overlapping rate is 20%; a second wrapping layer 8 is arranged outside the third water-blocking layer, and finally a flame-retardant high-tearing-resistance chlorinated polyethylene rubber outer sheath 9 is extruded outside the second wrapping layer.
In order to further improve the performance of the cable, the conductor adopts a 5 th soft copper conductor, the first water-resistant layer, the second water-resistant layer and the third water-resistant layer are all semiconductor water-resistant bands, the first wrapping band is a single-sided aluminum-plastic composite band, and aluminum faces outwards; the second wrapping belt is non-woven fabric, the metal shielding layer is formed by knitting tinned copper wires, and the knitting density is not less than 80%.
As shown in fig. 2, the conductor is formed by twisting a plurality of strand wires in layers, each layer of strand wires is formed by combining a plurality of strand wires 10, the twisting directions of two adjacent layers are opposite, and a single-sided semi-conductive water-blocking tape 11 is wrapped between each two adjacent layers of strand wires; the concrete structure is as follows: the multi-layer stranded conductor adopts a concentric structure in a mode of 1+6+12, and is formed by stranding 1 strand wire, 6 strand wires and 12 strand wires in three layers.
Embodiment one:
a preparation method of an ethylene-propylene insulating water-blocking and flame-retardant power flexible cable comprises the following steps:
1) Firstly, adopting a 5 th soft copper conductor, wherein the wire direction of each layer of strand of the multi-layer stranded conductor is opposite to the stranded direction, and a single-sided semiconductor water-resistant belt is wrapped between each layer of stranded layer, and water-blocking yarns are bundled;
2) Then overlapping the wrapped semiconductor water-resistance belt outside the conductor, wherein the overlapping rate is 20%;
3) Extruding and wrapping the crosslinked flame-retardant ethylene-propylene rubber outside the semiconductive water-blocking band through an extruding machine in a catenary continuous vulcanization rubber extruding production line, wherein the temperature of the extruding machine is controlled to be 70-90 ℃, the production line speed is controlled to be 5-10 m/min, the extruded wire core is heated in a sealed steam pipeline for continuous vulcanization, and the air pressure of the steam pipeline is controlled to be 0.9-1.2 MPa; after vulcanization, the cable is cooled by a water cooling pipeline to form an insulated cable core, and the temperature of the cooling section water is controlled at 30-50 ℃;
4) Secondly, overlapping the lapped semiconductor water-resistant belt outside the insulated wire core, wherein the overlapping rate is 20%;
5) Secondly, overlapping and wrapping a single-sided aluminum-plastic composite belt on the semiconductive water-blocking belt, wherein the aluminum faces outwards, and the overlapping rate is 20%;
6) Secondly, braiding a single-sided aluminum-plastic composite belt with tinned copper wires to form a metal shielding layer, wherein the braiding density is more than 80%;
7) Secondly, overlapping the lapped semiconductor water-resistant belt outside the metal shielding layer, wherein the overlapping rate is 20%;
8) Secondly, overlapping and wrapping non-woven fabrics outside the semiconductive water blocking band for binding, wherein the overlapping rate is 20%;
9) Secondly, extruding and wrapping the flame-retardant high-tearing-resistance chlorinated polyethylene rubber outside the non-woven fabric binding layer through an rubber extruder in a catenary continuous sulfur rubber extrusion production line, wherein the extrusion temperature is controlled at 75-88 ℃, the production line speed is controlled at 5-8 m/min, the wire core is heated and continuously vulcanized in a sealed steam pipeline, and the air pressure of the steam pipeline is controlled at 0.9-1.2 MPa; and cooling the cable through a water cooling pipeline after vulcanization, wherein the temperature of the cooling section water is controlled to be 30-50 ℃.
The crosslinked flame-retardant ethylene-propylene rubber insulating layer in the step 3) is prepared by mixing ethylene-propylene insulating rubber, an oxidant, a plasticizer, a vulcanizing agent, a reinforcing agent and an anti-aging agent through an internal mixer, and forming a sheet into a flame-retardant ethylene-propylene insulating rubber meeting continuous sulfur extrusion, wherein the flame-retardant ethylene-propylene insulating rubber comprises the following components in parts by mass: 100 parts of EPDM, 4-8 parts of ZnO, 5-8 parts of plasticizer, 2-3 parts of anti-aging agent, 50-75 parts of reinforcing filler, 3-5 parts of vulcanizing agent and 8-10 parts of flame retardant.
The flame-retardant high-tearing-resistance chlorinated polyethylene sheath rubber in the step 8) is prepared by mixing chlorinated polyethylene rubber, an oxidant, a plasticizer, a vulcanizing agent, a reinforcing agent and an anti-aging agent through an internal mixer and discharging into a sheet, wherein the flame-retardant high-tearing-resistance chlorinated polyethylene sheath rubber meets continuous sulfur extrusion, and comprises the following components in parts by mass: 100 parts of CPE, 6-12 parts of MgO, 15-20 parts of plasticizer, 2-3 parts of anti-aging agent, 60-80 parts of reinforcing filler, 20-30 parts of flame retardant and 4-6 parts of vulcanizing agent.
Performance measurement:
the structure size and performance prepared by the method are as follows:
flame-retardant power flexible cable with rated voltage of 0.6/1 kV ethylene-propylene insulating chlorinated polyethylene sheath
Model: ERFP-6/10 1X 400
1. A main line conductor: 400 mm (mm) 2 ；
2. First layer water blocking layer: 1 layer of semiconductive water-blocking tape is overlapped and wrapped, and the thickness is multiplied by the width: 0.4X10 mm, overlapping rate is more than or equal to 20%;
3. ethylene propylene insulation: flame-retardant ethylene-propylene insulating rubber with nominal thickness of 2.6mm;
4. second layer water blocking layer: 1 layer of semiconductive water-blocking tape is overlapped and wrapped, and the thickness is multiplied by the width: 0.4X10 mm, overlapping rate is more than or equal to 20%;
5. a first layer wrapping layer: 1 layer of single-sided aluminum-plastic composite tape is overlapped and wrapped, and the thickness is multiplied by the width: 0.2 multiplied by 60mm, and the overlapping rate is more than or equal to 20 percent;
6. metal braid: tinned copper wires, wherein the diameter phi of the copper wires is 0.2mm, and the braiding density is more than 80%;
7. third layer water blocking layer: 1 layer of semiconductive water-blocking tape is overlapped and wrapped, and the thickness is multiplied by the width: 0.4X10 mm, overlapping rate is more than or equal to 20%;
8. a second layer of wrapping layer: 1 layer of non-woven fabric is overlapped and wrapped, and the thickness is multiplied by the width: 0.2 multiplied by 60mm, and the overlapping rate is more than or equal to 20 percent;
9. an outer sheath: the nominal thickness of the flame-retardant high-tearing-resistance chlorinated polyethylene sheath rubber is 2.0mm.
Performance:
the power wire core insulating material adopts flame-retardant ethylene-propylene rubber insulating glue, the long-term working temperature of the cable conductor reaches 90 ℃, and the short-circuit temperature is 250 ℃ (the duration time is less than or equal to 5 s);
(2) withstand voltage test: cable application 3.5U O The test voltage of the cable is kept for 5min, and the cable insulation is not broken down;
(3) chlorinated polyethylene sheath rubber anti-si performance: 8.5N/mm;
(4) cable flame retardant performance: pass GB/T18380.34-2008 bundled combustion B test;
(5) and (3) scraping and grinding the outer sheath, namely applying an acting force 210N, scraping and grinding for 25 times, wherein the inner surface and the outer surface of the sheath are free from cracks, and the cable part breaks down under the subsequent impulse voltage (20 kV, 10 times of positive and negative polarity respectively).
The foregoing is merely a preferred embodiment of the present invention and it should be noted that variations and modifications could be made by those skilled in the art without departing from the principles of the present invention, which would also be considered to fall within the scope of the invention.

Claims (9)

1. An ethylene-propylene insulating water-blocking and flame-retardant power flexible cable is characterized in that: the cable comprises a conductor, a first water-resistant layer and a second water-resistant layer are sequentially wrapped outside the conductor, and a cross-linked flame-retardant ethylene-propylene rubber insulating layer is extruded between the first water-resistant layer and the second water-resistant layer to form an insulating cable core; the first wrapping layer is arranged outside the second water-blocking layer, the metal shielding layer is arranged outside the first wrapping layer, the third water-blocking layer is wrapped outside the metal shielding layer, the second wrapping layer is arranged outside the third water-blocking layer, and finally the flame-retardant high-tearing-resistance chlorinated polyethylene rubber outer sheath is extruded outside the second wrapping layer.
2. The ethylene-propylene insulated water-blocking and flame-retardant power flexible cable according to claim 1, wherein: the conductor is a 5 th soft copper conductor, the conductor is formed by layering and twisting a plurality of strand wires, each layer of strand wires is formed by combining a plurality of strand wires, the twisting directions of two adjacent layers are opposite, and a single-sided semiconductor water-resistant belt is wrapped between each two adjacent layers of strand wires.
3. The ethylene-propylene insulated water-blocking and flame-retardant power flexible cable according to claim 1, wherein: the first water-resistant layer, the second water-resistant layer and the third water-resistant layer are all semiconductor water-resistant bands.
4. The ethylene-propylene insulated water-blocking and flame-retardant power flexible cable according to claim 1, wherein: the first wrapping belt is a single-sided aluminum-plastic composite belt, and aluminum faces outwards.
5. The ethylene-propylene insulated water-blocking and flame-retardant power flexible cable according to claim 1, wherein: the second wrapping belt is non-woven fabric.
6. The ethylene-propylene insulated water-blocking and flame-retardant power flexible cable according to claim 1, wherein: the metal shielding layer is formed by braiding tinned copper wires, and the braiding density is not less than 80%.
7. A method for preparing the ethylene-propylene insulating water-blocking and flame-retardant power flexible cable as claimed in claim 1, which is characterized in that: the method comprises the following steps:
1) Firstly, adopting a 5 th soft copper conductor, wherein the wire direction of each layer of strand of the multi-layer stranded conductor is opposite to the stranded direction, and a single-sided semiconductor water-resistant belt is wrapped between each layer of stranded layer, and water-blocking yarns are bundled;
2) Then overlapping the wrapped semiconductor water-resistance belt outside the conductor, wherein the overlapping rate is 20%;
3) Extruding and wrapping the crosslinked flame-retardant ethylene-propylene rubber outside the semiconductive water-blocking band through an extruding machine in a catenary continuous vulcanization rubber extruding production line, wherein the temperature of the extruding machine is controlled to be 70-90 ℃, the production line speed is controlled to be 5-10 m/min, the extruded wire core is heated in a sealed steam pipeline for continuous vulcanization, and the air pressure of the steam pipeline is controlled to be 0.9-1.2 MPa; after vulcanization, the cable is cooled by a water cooling pipeline to form an insulated cable core, and the temperature of the cooling section water is controlled at 30-50 ℃;
4) Secondly, overlapping the lapped semiconductor water-resistant belt outside the insulated wire core, wherein the overlapping rate is 20%;
5) Secondly, overlapping and wrapping a single-sided aluminum-plastic composite belt on the semiconductive water-blocking belt, wherein the aluminum faces outwards, and the overlapping rate is 20%;
6) Secondly, braiding a single-sided aluminum-plastic composite belt with tinned copper wires to form a metal shielding layer, wherein the braiding density is more than 80%;
7) Secondly, overlapping the lapped semiconductor water-resistant belt outside the metal shielding layer, wherein the overlapping rate is 20%;
8) Secondly, overlapping and wrapping non-woven fabrics outside the semiconductive water blocking band for binding, wherein the overlapping rate is 20%;
9) Secondly, extruding and wrapping the flame-retardant high-tearing-resistance chlorinated polyethylene rubber outside the non-woven fabric binding layer through an rubber extruder in a catenary continuous sulfur rubber extrusion production line, wherein the extrusion temperature is controlled at 75-88 ℃, the production line speed is controlled at 5-8 m/min, the wire core is heated and continuously vulcanized in a sealed steam pipeline, and the air pressure of the steam pipeline is controlled at 0.9-1.2 MPa; and cooling the cable through a water cooling pipeline after vulcanization, wherein the temperature of the cooling section water is controlled to be 30-50 ℃.
8. The method for preparing the ethylene-propylene insulating water-blocking and flame-retardant power flexible cable according to claim 7, which is characterized in that: the crosslinked flame-retardant ethylene-propylene rubber insulating layer in the step 3) is prepared by mixing ethylene-propylene insulating rubber, an oxidant, a plasticizer, a vulcanizing agent, a reinforcing agent and an anti-aging agent through an internal mixer, and forming a sheet into a flame-retardant ethylene-propylene insulating rubber meeting continuous sulfur extrusion, wherein the flame-retardant ethylene-propylene insulating rubber comprises the following components in parts by mass: 100 parts of EPDM, 4-8 parts of ZnO, 5-8 parts of plasticizer, 2-3 parts of anti-aging agent, 50-75 parts of reinforcing filler, 3-5 parts of vulcanizing agent and 8-10 parts of flame retardant.
9. The preparation method of the ethylene-propylene insulating water-blocking and flame-retardant power flexible cable is characterized in that the flame-retardant high-tearing-resistance chlorinated polyethylene rubber outer sheath in the step 8) is prepared by mixing chlorinated polyethylene rubber, an oxidant, a plasticizer, a vulcanizing agent, a reinforcing agent and an anti-aging agent through an internal mixer and discharging into a sheet to form the flame-retardant high-tearing-resistance chlorinated polyethylene sheath rubber meeting continuous sulfur extrusion, and the flame-retardant high-tearing-resistance chlorinated polyethylene sheath rubber comprises the following components in parts by mass: 100 parts of CPE, 6-12 parts of MgO, 15-20 parts of plasticizer, 2-3 parts of anti-aging agent, 60-80 parts of reinforcing filler, 20-30 parts of flame retardant and 4-6 parts of vulcanizing agent.
CN201711434287.9A 2017-12-26 2017-12-26 Ethylene-propylene insulating water-blocking flame-retardant power flexible cable and preparation method thereof Active CN107945939B (en)

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CN110517832A (en) * 2019-08-28 2019-11-29 江苏亨通高压海缆有限公司 production process and production system of water-blocking conductor
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CN201562476U (en) * 2009-12-15 2010-08-25 上海南大集团有限公司 Ethylene propylene rubber-insulated metal-sprayed woven fabric-shielded flexible power cable
CN105968698A (en) * 2016-06-30 2016-09-28 安徽埃克森科技集团有限公司 Cable and production process thereof
CN106782832A (en) * 2016-12-23 2017-05-31 绵阳市长信电线电缆有限公司 Anti-explosion cable and preparation method thereof
CN207966511U (en) * 2017-12-26 2018-10-12 无锡市明珠电缆有限公司 A kind of insulation of second third blocks water, fire-retardant flexible electric power cable

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CN201562476U (en) * 2009-12-15 2010-08-25 上海南大集团有限公司 Ethylene propylene rubber-insulated metal-sprayed woven fabric-shielded flexible power cable
CN105968698A (en) * 2016-06-30 2016-09-28 安徽埃克森科技集团有限公司 Cable and production process thereof
CN106782832A (en) * 2016-12-23 2017-05-31 绵阳市长信电线电缆有限公司 Anti-explosion cable and preparation method thereof
CN207966511U (en) * 2017-12-26 2018-10-12 无锡市明珠电缆有限公司 A kind of insulation of second third blocks water, fire-retardant flexible electric power cable

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