CN113871088B - Explosion-proof cable and preparation method thereof - Google Patents

Explosion-proof cable and preparation method thereof Download PDF

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Publication number
CN113871088B
CN113871088B CN202111153689.8A CN202111153689A CN113871088B CN 113871088 B CN113871088 B CN 113871088B CN 202111153689 A CN202111153689 A CN 202111153689A CN 113871088 B CN113871088 B CN 113871088B
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Prior art keywords
explosion
cable
proof
layer
core
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CN113871088A (en
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徐文栓
高欣奕
李豪冲
王建
张�浩
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Yaxing Cable Group Co ltd
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Yaxing Cable Group 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
    • H01B9/00—Power cables
    • H01B9/006—Constructional features relating to the conductors
    • 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
    • H01B7/0009—Details relating to the conductive cores
    • 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
    • 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
    • H01B7/189—Radial force absorbing layers providing a cushioning effect
    • 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
    • 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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  • Insulated Conductors (AREA)

Abstract

The invention relates to the technical field of special cables, in particular to an explosion-proof cable and a preparation method thereof, wherein a conductive wire core of a cable wire core is arranged into a plurality of sub conductive wire cores to be in seamless contact, so that the deformation rate of the conductive wire core after being impacted is reduced to 0.3%, and a protection unit, particularly an explosion-proof buffer layer, which is coated on the outer side of the cable wire core is combined to protect the cable wire core, so that the prepared explosion-proof cable has good appearance, insulation resistance of more than 1000MΩ and good conductivity under the condition of being impacted by the overpressure of a shock wave, and the problems of damage to the cable wire core and loss of power supply capability after being impacted by the overpressure of the shock wave generated by explosion are solved.

Description

Explosion-proof cable and preparation method thereof
Technical Field
The invention relates to the technical field of special cables, in particular to an explosion-proof cable and a preparation method thereof.
Background
With the development of the power industry, the requirements of various industries on cables are increasing, and meanwhile, the requirements on the cables are also increasing. The power cable used in some explosion-dangerous places at present cannot bear larger impact force, explosion-proof protection cannot be provided for the cable, safety is poor, short circuit can be broken down after the impact generated by explosion is received, power supply capacity is lost, secondary damage to the cable and damage to the cable can be caused by combustion and high temperature caused by explosion, and requirements of some high-risk special places at present, particularly the military field are not met.
Disclosure of Invention
Aiming at the technical problems, the invention provides an explosion-proof cable capable of bearing the impact of large shock wave overpressure.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
the cable core is provided with at least one, and comprises a conductive core and a composite insulating layer wrapping the periphery of the conductive core; the conductive wire core comprises a plurality of sub conductive wire cores, each sub conductive wire core comprises a plurality of monofilament conductive wires, and adjacent sub conductive wire cores are in seamless contact;
the protection unit is wrapped on the periphery of the cable core and comprises an explosion-proof buffer layer, an isolation layer, an armor layer and an outer protective layer which are sequentially stacked from the side close to the cable core;
and the filling unit is filled in a gap between the cable core and the protection unit.
Compared with the prior art, the explosion-proof cable provided by the invention has the following advantages:
the inventor researches find that the conductors in the existing cable cores are formed by twisting a plurality of cylindrical conductive cores, a larger gap is reserved between adjacent cylindrical conductive cores, the power supply capacity can be lost after the conductors are impacted by explosion, and secondary damage can be caused to the cable due to combustion and high temperature caused by the explosion, so that the cable is damaged; the explosion-proof cable provided by the invention has the advantages that the conductive wire core of the cable wire core is arranged into the seamless contact of the plurality of sub-conductive wire cores, the deformation rate of the conductive wire core after being impacted is reduced, and the outer side of the cable wire core is coated with the protection unit, so that the cable wire core can be protected, and the damage to the cable wire core caused by the impact of the shock wave overpressure generated by explosion is greatly reduced.
Preferably, the explosion-proof buffer layer comprises the following components in percentage by mass: 32 to 33 percent of polyvinyl chloride resin, 14.7 to 15.7 percent of chlorinated polyethylene resin, 1.0 to 2.0 percent of antimonous oxide, 0.3 to 0.7 percent of trimethylolpropane trimethacrylate, 19.85 to 20.85 percent of nano calcium carbonate, 18.4 to 20.4 percent of plasticizing softener, 6.0 to 8.0 percent of micropore generator, 1.6 to 3.6 percent of extrusion modifier, 0.15 to 0.75 percent of anti-aging agent and 0.3 to 0.7 percent of colorant.
The explosion-proof buffer layer takes polyvinyl chloride resin as master batch, and chlorinated polyethylene resin is added at the same time, so that the flame retardant property, impact strength and mechanical property of the material are obviously improved; the addition of the antimony trioxide can eliminate residual stress, improve the flame retardant property of the material, and simultaneously can improve the stability of the system, and the addition of the trimethylolpropane trimethacrylate has a synergistic effect with the antimony trioxide, can improve the local internal stress of the material, further improve the impact strength of the system, and simultaneously endow the material with excellent toughness; the micropore generating agent is added to enable the material to have the performance of bearing ultrasonic overpressure, so that the damage of the ultrasonic overpressure to insulation is reduced; the nano calcium carbonate is used as a filler, so that the material has high strength and heat resistance; the extrusion modifier enables the material to have excellent lubricating property and improves the melt fluidity of the material; plasticizing softeners provide excellent softening properties to the material.
The explosion-proof buffer layer made of the materials in specific respective dosage ranges can enable the cable to slowly release the energy received by the cable for a long time after receiving the impact of the shock wave, obviously reduce the damage of the shock wave overpressure to insulation and protect the cable core. Through the matching of the structure and the materials, the problem that the cable core is damaged and loses the power supply capacity after being impacted by the overpressure of shock waves generated by explosion can be better solved.
Preferably, the plasticizing softener is a mixture of dioctyl adipate and chlorinated paraffin, and the mass ratio of the dioctyl adipate to the chlorinated paraffin is 9-9.5: 10 to 10.5.
The dioctyl adipate and the polymer master batch have better compatibility, promote the uniform dispersion of the dioctyl adipate in the polymer master batch, fully exert plasticizing effect, and the chlorinated paraffin assists the dioctyl adipate to generate softening performance effect, simultaneously fully exert plasticizing performance of the dioctyl adipate, promote the remarkable improvement of plasticizing performance, and further increase the flame resistance and compression resistance of the material.
Preferably, the micropore generating agent is a mixture of aluminum hydroxide and magnesium hydroxide, and the mass ratio of the aluminum hydroxide to the magnesium hydroxide is 2.3-2.7: 1.
the aluminum hydroxide and the magnesium hydroxide are cooperatively matched, so that the material has the performance of bearing ultrasonic overpressure, and the damage of the ultrasonic overpressure to insulation is reduced.
Preferably, the extrusion modifier is a mixture of stearic acid and polyethylene wax, and the mass ratio of the stearic acid to the polyethylene wax is 5.0-5.5: 0.8 to 1.2.
Stearic acid is used as an extrusion modifier to play a role in lubrication, and is matched with polyethylene wax in a system, so that the melt fluidity of the material is improved, and particularly, the key of improving the high viscosity of chlorinated polyethylene melt and processing defects between equipment is improved, and the processing performance and quality of the material are improved.
Preferably, the anti-aging agent is a mixture of lead salt and an anti-aging agent RD, and the mass ratio of the lead salt to the anti-aging agent RD is 1 to 1.5:1.
the lead salt and the antioxidant RD which are reasonably proportioned obviously improve the ageing resistance of the cable material.
Preferably, the colorant is lithol baohong.
Preferably, the thickness of the explosion-proof layer is 2.2-2.7 mm.
Preferably, the composite insulating layer includes a conductor shielding layer, an insulating shielding layer, and a metal shielding layer, which are stacked in this order from the near-conductive core side.
Preferably, the preparation method of the explosion-proof buffer layer specifically comprises the following steps:
weighing the components according to the mass percentages of the components of the explosion-proof buffer layer for later use;
step two, mixing the polyvinyl chloride resin and the chlorinated polyethylene resin at 160-200 ℃ to obtain a mixture I;
adding the micropore generating agent and the nano calcium carbonate into the mixture I, mixing, adding the antimonous oxide, the trimethylolpropane trimethacrylate, the plasticizing softener, the extrusion modifier, the anti-aging agent and the colorant, and mixing for 8-12 min to obtain a mixture II;
and fourthly, extruding and granulating the mixture II at the temperature of 150-190 ℃ and extruding and granulating to form the explosion-proof buffer layer.
The explosion-proof buffer layer obtained by the simple preparation method can slowly release the received energy for a long time after the cable receives the impact of the shock wave, reduce the damage of the shock wave overpressure to the insulation and protect the cable.
Preferably, the conductor shielding layer comprises polyethylene and conductive carbon black, and the mass ratio of the polyethylene to the conductive carbon black is 4-5: 1, the thickness of the conductor shielding layer is 0.8-1.0 mm; the insulating layer is made of crosslinked polyethylene material and has the thickness of 4.5-10.5 mm; the insulating shielding layer comprises polyethylene and conductive carbon black, and the mass ratio of the polyethylene to the conductive carbon black is 4-5: 1, the thickness of the insulating shielding layer is 0.8-1.0 mm; the metal shielding layer is a copper strip shielding layer, and the thickness is 0.1-0.12 mm.
Preferably, the isolation layer is made of polyvinyl chloride or polyethylene material, and the thickness is 2.5-2.7 mm; the armor layer is steel belt or steel wire armor, and the thickness is 0.5-0.8 mm; the outer protective layer is made of low-smoke flame-retardant polyethylene material, flame-retardant polyvinyl chloride material or flame-retardant polyethylene material, and the thickness is 3.2-4.6 mm.
The invention also provides a preparation method of the explosion-proof cable, which comprises the following steps:
step A, twisting a plurality of monofilament conductive wires into sub-conductive wire cores, and twisting and compacting a plurality of sub-conductive wire cores into a seamless contact state to obtain a conductive wire core;
step B, three layers of the conductor shielding layer, the insulating layer and the insulating shielding layer are formed in a coextrusion mode, the conductor shielding layer is extruded and coated outside the conductive wire core and adjacent to the conductive wire core, and the metal shielding layer is wrapped outside the insulating shielding layer to form the cable wire core;
and C, sequentially coating the explosion-proof buffer layer, the isolation layer, the armor layer and the outer protective layer outside the cable core to obtain the explosion-proof cable.
In the step C, the explosion-proof buffer layer and the isolation layer are preferably coated in an extrusion coating manner, and the armor layer is preferably coated in a wrapping manner.
Furthermore, it will be understood by those skilled in the art from the routine operation in the field that when the cable cores in step C are plural, the cable cores should be first belted into a cable and then the protection unit is belted, and the gaps between the plural cable cores are filled with a filler, which is a PP filler rope or a fan-shaped filler strip based on polyethylene.
According to the invention, the conductive wire cores of the cable wire cores are arranged to be in seamless contact with each other, so that the deformation rate of the conductive wire cores after being subjected to impact is reduced to 0.3%, and the cable wire cores are protected by the protection unit, especially the explosion-proof buffer layer, which is combined with the protection unit coated on the outer sides of the cable wire cores, so that the prepared explosion-proof cable has good appearance, insulation resistance of more than 1000MΩ and good conductivity under the condition of 5MPa of impact wave overpressure, can be normally used, and solves the problems that the cable cores are damaged and power supply capacity is lost after being impacted by large impact wave overpressure generated by explosion.
Drawings
FIG. 1 is a schematic diagram of a cross section of an explosion-proof cable;
FIG. 2 is a schematic diagram of a cross section of a conductive core;
FIG. 3 is a photograph of an explosion-proof cable prior to testing;
FIG. 4 is a photograph of an explosion-proof cable after testing;
reference numerals illustrate:
100-cable cores; 110-a conductive core; a 111-sub-conductive core; 120-conductor shielding layer; 130-an insulating layer; 140-insulating shielding layer; 150-a metal shielding layer; 200-protecting units; 210-an explosion-proof buffer layer; 220-isolating layer; 230-armor; 240-an outer sheath; 300-filler.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, an explosion-proof cable provided by the present invention will now be described.
As shown, the explosion-proof cable includes:
the cable core 100 is provided with at least one cable core 100, and each cable core 100 comprises a conductive core 110 and a composite insulating layer wrapped on the periphery of the conductive core 110; the conductive wire core 110 comprises a plurality of sub conductive wire cores 111, each sub conductive wire core comprises a plurality of monofilament conductive wires, and adjacent sub conductive wire cores 111 are in seamless contact;
the protection unit 200 is wrapped around the outer periphery of the cable core 100, and the protection unit 300 comprises an explosion-proof buffer layer 210, an isolation layer 220, an armor layer 230 and an outer protection layer 240 which are sequentially stacked from the side near the cable core 100;
and a filler 300 filling a gap between the cable core 100 and the protection unit 200.
As a specific embodiment provided by the explosion-proof cable of the present invention, the cable core 100 is provided with three.
As a specific embodiment provided by the explosion-proof cable of the present invention, the composite insulation layer includes, from the side near the conductive core 110, a conductor shielding layer 120, an insulation layer 130, an insulation shielding layer 140, and a metal shielding layer 150, which are sequentially stacked.
As a specific implementation mode provided by the explosion-proof cable, the explosion-proof buffer layer comprises the following components in percentage by mass: 32 to 33 percent of polyvinyl chloride resin, 14.7 to 15.7 percent of chlorinated polyethylene resin, 1.0 to 2.0 percent of antimonous oxide, 0.3 to 0.7 percent of trimethylolpropane trimethacrylate, 19.85 to 20.85 percent of nano calcium carbonate, 18.4 to 20.4 percent of plasticizing softener, 6.0 to 8.0 percent of micropore generator, 1.6 to 3.6 percent of extrusion modifier, 0.15 to 0.75 percent of anti-aging agent and 0.3 to 0.7 percent of colorant.
On the basis of the embodiment, the plasticizing and softening agent is a mixture of dioctyl adipate and chlorinated paraffin, and the mass ratio of the dioctyl adipate to the chlorinated paraffin is 9-9.5: 10 to 10.5.
On the basis of the embodiment, the micropore generating agent is a mixture of aluminum hydroxide and magnesium hydroxide, and the mass ratio of the aluminum hydroxide to the magnesium hydroxide is 2.3-2.7: 1.
based on the embodiment, the extrusion modifier is a mixture of stearic acid and polyethylene wax, and the mass ratio of the stearic acid to the polyethylene wax is 5.0-5.5: 0.8 to 1.2.
On the basis of the embodiment, the anti-aging agent is a mixture of lead salt and the anti-aging agent RD, and the mass ratio of the lead salt to the anti-aging agent RD is 1 to 1.5:1.
the embodiment of the invention also provides a preparation method of the explosion-proof buffer layer, which comprises the following steps:
weighing the components according to the mass percentages of the components of the explosion-proof buffer layer for standby;
step two, mixing polyvinyl chloride resin and chlorinated polyethylene resin at 160-200 ℃ to obtain a mixture I;
adding a micro-pore generating agent and nano calcium carbonate into the mixture I, mixing, then adding antimony trioxide, trimethylolpropane trimethacrylate, plasticizing softener, extrusion modifier, anti-aging agent and colorant, and mixing for 8-12 min to obtain a mixture II;
and fourthly, extruding and granulating the mixture II at the temperature of 150-190 ℃ and extruding and granulating to form the explosion-proof buffer layer.
The embodiment of the invention also provides a preparation method of the explosion-proof cable, which comprises the following steps:
step A, twisting a plurality of monofilament conductive wires into sub-conductive wire cores 111, and then twisting and compacting the plurality of sub-conductive wire cores 111 into a seamless contact state to obtain a conductive wire core 110;
step B, three layers of the conductor shielding layer 120, the insulating layer 130 and the insulating shielding layer 140 are co-extruded and formed, the conductor shielding layer 120 is extruded and coated on the outer part of the conductive wire core 110, the conductor shielding layer 120 is adjacent to the conductive wire core 110, and the metal shielding layer 150 is wrapped on the outer part of the insulating shielding layer 140 to form the cable wire core 100;
and step C, sequentially coating an explosion-proof buffer layer 210, an isolation layer 220, an armor layer 230 and an outer protective layer 240 outside the cable core 100 to obtain the explosion-proof cable.
In step C, the explosion-proof buffer layer 210 and the isolation layer 220 are preferably coated by extrusion coating, and the armor layer 230 is preferably coated by wrapping.
Furthermore, it will be understood by those skilled in the art from the routine operation in the field that when the cable cores in step C are plural, the cable cores should be first belted into a cable and then the protection unit is belted, and the gaps between the plural cable cores are filled with a filler, which is a PP filler rope or a fan-shaped filler strip based on polyethylene.
The mass ratio of the conductor shielding layer in the following embodiments is 5:1 with conductive carbon black, the thickness of the mixture is 1.0mm;
the insulating layer is made of crosslinked polyethylene material and has the thickness of 6mm;
the insulating shielding layer is prepared from the following components in percentage by mass: 1 with conductive carbon black, the thickness of the mixture is 1.0mm;
the metal shielding layer is a copper strip shielding layer, and the thickness is 0.1mm.
The isolation layer is a polyvinyl chloride sheath with the thickness of 2.5mm;
the armor layer is made of 45# steel tape armor material and has the thickness of 0.8mm;
the outer protective layer is made of low smoke flame retardant polyethylene material, and the thickness is 4.0mm.
The following illustrates the explosion-proof buffer layer, the preparation method thereof, and the preparation method of the explosion-proof cable by specific examples:
example 1:
the embodiment provides an explosion-proof buffer layer for the explosion-proof cable, which comprises the following components in percentage by mass: 32.5% of polyvinyl chloride resin, 15.2% of chlorinated polyethylene resin, 1.5% of antimonous oxide, 0.5% of trimethylolpropane trimethacrylate, 20.35% of nano calcium carbonate, 19.4% of plasticizing softener, 7.0% of micropore generating agent, 2.6% of extrusion modifier, 0.45% of anti-aging agent and 0.5% of colorant; wherein, the mass ratio of the plasticizing softener is 9.2:10.2 a mixture of dioctyl adipate and chlorinated paraffin; the mass ratio of the micropore generating agent is 5: 2a mixture of aluminium hydroxide and magnesium hydroxide; the extrusion modifier has a mass ratio of 5.5:1 and polyethylene wax; the mass ratio of the anti-aging agent is 5:4, a mixture of lead salt and an anti-aging agent RD, wherein the coloring agent is Lixol red;
the preparation process specifically comprises the following steps:
weighing the components in percentage by mass according to the components of the explosion-proof buffer layer for standby;
step two, placing the polyvinyl chloride resin and the chlorinated polyethylene resin into a high-speed mixer, mixing at the rotational speed of 300r/min, and mixing at 180 ℃ for 5min to obtain a mixture I;
adding a micro-pore generating agent and nano calcium carbonate into the mixture I, mixing for 2min, adding antimony trioxide, trimethylolpropane trimethacrylate, plasticizing softener, extrusion modifier, anti-aging agent and colorant, and mixing for 10min to obtain a mixture II;
and step four, extruding and granulating the mixture II at 180 ℃, and extruding the explosion-proof buffer layer through a granule extruding machine.
Example 2:
the embodiment provides an explosion-proof buffer layer for the explosion-proof cable, which comprises the following components in percentage by mass: 32% of polyvinyl chloride resin, 15.5% of chlorinated polyethylene resin, 1.2% of antimonous oxide, 0.3% of trimethylolpropane trimethacrylate, 19.85% of nano calcium carbonate, 19.4% of plasticizing softener, 7.6% of micropore generating agent, 2.8% of extrusion modifier, 0.65% of anti-aging agent and 0.7% of colorant; wherein the mass ratio of the plasticizing softener is 9.5:10 dioctyl adipate and chlorinated paraffin; the mass ratio of the micropore generating agent is 2.6:1 a mixture of aluminium hydroxide and magnesium hydroxide; the extrusion modifier has a mass ratio of 5.5:1 and polyethylene wax; the mass ratio of the anti-aging agent is 1:1 and an anti-aging agent RD, wherein the coloring agent is Lixol red;
the preparation process specifically comprises the following steps:
weighing the components in percentage by mass according to the components of the explosion-proof buffer layer for standby;
step two, placing the polyvinyl chloride resin and the chlorinated polyethylene resin into a high-speed mixer, mixing at the rotational speed of 300r/min, and mixing at 160 ℃ for 5min to obtain a mixture I;
adding a micro-pore generating agent and nano calcium carbonate into the mixture I, mixing for 2min, adding antimony trioxide, trimethylolpropane trimethacrylate, plasticizing softener, extrusion modifier, anti-aging agent and colorant, and mixing for 8min to obtain a mixture II;
and step four, extruding and granulating the mixture II at 170 ℃, and then extruding the explosion-proof buffer layer through a granule extruder.
Example 3:
the embodiment provides an explosion-proof buffer layer for the explosion-proof cable, which comprises the following components in percentage by mass: 32% of polyvinyl chloride resin, 15.7% of chlorinated polyethylene resin, 1.2% of antimonous oxide, 0.7% of trimethylolpropane trimethacrylate, 19.85% of nano calcium carbonate, 19.6% of plasticizing softener, 8.0% of micropore generating agent, 2.1% of extrusion modifier, 0.45% of anti-aging agent and 0.4% of colorant; wherein, the mass ratio of the plasticizing softener is 9.2:10.2 a mixture of dioctyl adipate and chlorinated paraffin; the mass ratio of the micropore generating agent is 5: 2a mixture of aluminium hydroxide and magnesium hydroxide; the extrusion modifier has a mass ratio of 5.5:1 and polyethylene wax; the mass ratio of the anti-aging agent is 5:4, a mixture of lead salt and an anti-aging agent RD, wherein the coloring agent is Lixol red;
the preparation process specifically comprises the following steps:
weighing the components in percentage by mass according to the components of the explosion-proof buffer layer for standby;
step two, placing the polyvinyl chloride resin and the chlorinated polyethylene resin into a high-speed mixer, mixing at the rotational speed of 300r/min, and mixing for 5min at the temperature of 195 ℃ to obtain a mixture I;
adding a micro-pore generating agent and nano calcium carbonate into the mixture I, mixing for 2min, adding antimony trioxide, trimethylolpropane trimethacrylate, plasticizing softener, extrusion modifier, anti-aging agent and colorant, and mixing for 12min to obtain a mixture II;
and step four, extruding and granulating the mixture II at 180 ℃, and extruding the explosion-proof buffer layer through a granule extruding machine.
Example 4:
the embodiment provides a preparation method of an explosion-proof cable with three cable cores, which specifically comprises the following steps:
step A, twisting a plurality of copper wires into a plurality of sub-conductive wire cores 111, and twisting the plurality of sub-conductive wire cores 111 into a plurality of conductive wire cores 110 which are tightly pressed into seamless contact;
step B, three layers of the conductor shielding layer 120, the insulating layer 130 and the insulating shielding layer 140 are co-extruded and coated outside the conductive wire core 110, the conductor shielding layer 120 is adjacent to the conductive wire core 110, then the metal shielding layer 150 is wrapped outside the insulating shielding layer 140 to form the cable wire core 100, and the three layers are co-extruded to be the conductor shielding layer, the insulating layer and the insulating shielding layer in sequence;
step C, wrapping the three cable cores 100 into a cable, sequentially extruding and wrapping the explosion-proof buffer layer 210 and the isolation layer 220 outside the cable, wrapping the armor layer 230 outside the isolation layer 220, and finally extruding and wrapping the outer protective layer 240 outside the armor layer 230 to obtain the explosion-proof cable, wherein gaps among the three cable cores and between the cable cores and the protection unit are filled with PP filling ropes. Wherein the composition and preparation method of the explosion-proof buffer layer 210 are the same as those of example 1.
Example 5:
the embodiment provides a preparation method of an explosion-proof cable with a cable core, which specifically comprises the following steps:
step A, twisting a plurality of copper wires into a plurality of sub-conductive wire cores 111, and twisting the plurality of sub-conductive wire cores 111 into a plurality of conductive wire cores 110 which are tightly pressed into seamless contact;
step B, three layers of the conductor shielding layer 120, the insulating layer 130 and the insulating shielding layer 140 are co-extruded and coated outside the conductive wire core 110, the conductor shielding layer 120 is adjacent to the conductive wire core 110, then the metal shielding layer 150 is wrapped outside the insulating shielding layer 140 to form the cable wire core 100, and the three layers are co-extruded to form the conductor shielding layer 120, the insulating layer 130 and the insulating shielding layer 140 in sequence;
step C, wrapping the cable core 100 into a cable, sequentially extruding and wrapping the explosion-proof buffer layer 210 and the isolation layer 220 outside the cable, wrapping the armor layer 230 outside the isolation layer 220, and finally extruding and wrapping the outer protection layer 240 outside the armor layer 230 to obtain the explosion-proof cable, wherein a gap between the cable core and the protection layer is filled with a sector filling strip taking polyethylene as a base material. Wherein the composition and preparation method of the explosion-proof buffer layer 210 are the same as those of example 2.
Example 6:
the explosion-proof buffer layer prepared in example 3 was used in this example to provide an explosion-proof cable and a preparation method thereof, and specific steps of the explosion-proof cable and the preparation method are the same as those in example 4.
Effect example 1:
in order to verify the performance of the explosion-proof cable prepared by the invention, the explosion-proof cables prepared by the embodiments 4 to 6 of the application are subjected to a ground shock wave overpressure test.
Type and specification of explosive: the black-2 explosive (8701) produced by national company 805 is adopted, and meets the requirements of national military standard 'black-2 explosive Specification' (GJB 2341-95). According to the test requirements and the dangerous goods quantitative requirements of an explosion tower, combining the explosive mass and the size of a explosive test method (GJB 772A-97) method 701.1 explosive heating constant temperature method and an adiabatic method, determining that the mass of the explosive is 25.0+/-0.1 g, the diameter of the explosive is 25.0mm, the height is 25mm, a detonator hole with the diameter of 7mm and the depth of 15mm is reserved at the upper part of the explosive, and preparing the explosive by adopting a compression molding mode; and the No. 8 electric detonator is adopted for direct detonation, and the booster grain is not required to be added.
And (5) calibrating overpressure of the shock wave: based on the detonation of the cylindrical charge, the direct action range of detonation products is 30r 0 (r 0 Radius of charge), the cylindrical charge is only 30r in charge distance 0 Except (375 mm) only by the shock wave alone. The shock wave overpressure test entrusted to the national defense science and technology important laboratory of North university electronic test technology, the test equipment is a high-pressure sensor (the measuring range is 0-30 MPa) developed by North university, 5 experiments with 7 distances are totally carried out, and the test results are shown in Table 1.
Table 1 table of results of ground shock wave overpressure test
Table 1 shows that the shock wave overpressure on the rigid ground is 2 times the air, and thus the shock wave overpressure at a distance of 350mm from the flare is 5.4MPa.
Explosion-proof cable ground shock wave overpressure test: the explosion-proof cables provided in examples 4 to 6 were subjected to the ground shock wave overpressure test, and fig. 3 and 4 are photographs before and after the explosion-proof cable test of example 4, respectively, and it can be seen that the explosion-proof cable has no damage to the surface and no ablation after the explosion-proof cable is subjected to the shock wave load of 5.5MPa, which is the same as that before the test.
Further, the insulation resistance and the conductor conductivity before and after the explosion-proof cable test were tested according to "extrusion insulated explosion-proof Power Cable" (Q/YXFB 01-20) 18.2.5, the conductivity was tested with a multimeter (UT33A+ type, utility sciences Co., ltd.), and the insulation resistance was tested with a megameter (ZC 11D-10 type, nanjing gold-Sichuan electric meter Co., ltd.), and the test results were shown in Table 2.
Table 2 results of the ground shock wave overpressure test of the explosion proof cable
Table 2 shows that the explosion-proof cable prepared by the invention has good appearance, qualified insulation resistance and good conductivity after being subjected to 5.4MPa ground shock wave overpressure.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.

Claims (8)

1. An explosion-proof cable, comprising:
the cable core is provided with at least one composite insulating layer which comprises a conductive core and is wrapped on the periphery of the conductive core; the conductive wire core comprises a plurality of sub conductive wire cores, each sub conductive wire core comprises a plurality of monofilament conductive wires, and adjacent sub conductive wire cores are in seamless contact;
the protection unit is wrapped on the periphery of the cable core and comprises an explosion-proof buffer layer, an isolation layer, an armor layer and an outer protective layer which are sequentially stacked from the side close to the cable core;
the filling unit is filled in a gap between the cable core and the protection unit;
wherein, explosion-proof buffer layer includes the following component of mass percent: 32 to 33 percent of polyvinyl chloride resin, 14.7 to 15.7 percent of chlorinated polyethylene resin, 1.0 to 2.0 percent of antimonous oxide, 0.3 to 0.7 percent of trimethylolpropane trimethacrylate, 19.85 to 20.85 percent of nano calcium carbonate, 18.4 to 20.4 percent of plasticizing softener, 6.0 to 8.0 percent of micropore generator, 1.6 to 3.6 percent of extrusion modifier, 0.15 to 0.75 percent of anti-aging agent and 0.3 to 0.7 percent of colorant.
2. The explosion-proof cable according to claim 1, wherein the plasticizing and softening agent is a mixture of dioctyl adipate and chlorinated paraffin, and the mass ratio of the dioctyl adipate to the chlorinated paraffin is 9-9.5: 10 to 10.5.
3. The explosion-proof cable according to claim 1, wherein the micropore generating agent is a mixture of aluminum hydroxide and magnesium hydroxide, and the mass ratio of the aluminum hydroxide to the magnesium hydroxide is 2.3-2.7: 1.
4. the explosion-proof cable according to claim 1, wherein the extrusion modifier is a mixture of stearic acid and polyethylene wax, and the mass ratio of the stearic acid to the polyethylene wax is 5.0-5.5: 0.8 to 1.2.
5. The explosion-proof cable according to claim 1, wherein the anti-aging agent is a mixture of lead salt and anti-aging agent RD, and the mass ratio of the lead salt to the anti-aging agent RD is 1-1.5: 1.
6. the explosion-proof cable according to claim 1, wherein the composite insulating layer comprises a conductor shielding layer, an insulating shielding layer and a metal shielding layer which are laminated in this order from a side near the conductive core.
7. The explosion-proof cable according to any one of claims 1 to 6, wherein the preparation method of the explosion-proof buffer layer specifically comprises the following steps:
weighing the components according to the mass percentages of the components of the explosion-proof buffer layer for later use;
step two, mixing the polyvinyl chloride resin and the chlorinated polyethylene resin at 160-200 ℃ to obtain a mixture I;
adding the micropore generating agent and the nano calcium carbonate into the mixture I, mixing, adding the antimonous oxide, the trimethylolpropane trimethacrylate, the plasticizing softener, the extrusion modifier, the anti-aging agent and the colorant, and mixing for 8-12 min to obtain a mixture II;
and fourthly, extruding and granulating the mixture II at the temperature of 150-190 ℃ and extruding and granulating to form the explosion-proof buffer layer.
8. The method for manufacturing an explosion-proof cable according to any one of claims 1 to 7, characterized by comprising the steps of:
step A, twisting a plurality of monofilament conductive wires into sub-conductive wire cores, and twisting and compacting a plurality of sub-conductive wire cores into a seamless contact state to obtain a conductive wire core;
step B, three layers of the conductor shielding layer, the insulating layer and the insulating shielding layer are formed in a coextrusion mode, the conductor shielding layer is extruded and coated outside the conductive wire core and adjacent to the conductive wire core, and the metal shielding layer is wrapped outside the insulating shielding layer to form the cable wire core;
and C, sequentially coating the explosion-proof buffer layer, the isolation layer, the armor layer and the outer protective layer outside the cable core to obtain the explosion-proof cable.
CN202111153689.8A 2021-09-29 2021-09-29 Explosion-proof cable and preparation method thereof Active CN113871088B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102938265A (en) * 2012-11-21 2013-02-20 上海贝恩科电缆有限公司 Explosion-proof elevator cable for fire protection
WO2015100764A1 (en) * 2013-12-31 2015-07-09 深圳市联嘉祥科技股份有限公司 Wear-resistant pressure-proof cable and manufacturing method therefor
CN112820449A (en) * 2020-12-29 2021-05-18 贵州新曙光电缆有限公司 Crosslinked polyethylene insulation halogen-free low-smoke flame-retardant rat and termite-proof medium-voltage power cable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102938265A (en) * 2012-11-21 2013-02-20 上海贝恩科电缆有限公司 Explosion-proof elevator cable for fire protection
WO2015100764A1 (en) * 2013-12-31 2015-07-09 深圳市联嘉祥科技股份有限公司 Wear-resistant pressure-proof cable and manufacturing method therefor
CN112820449A (en) * 2020-12-29 2021-05-18 贵州新曙光电缆有限公司 Crosslinked polyethylene insulation halogen-free low-smoke flame-retardant rat and termite-proof medium-voltage power cable

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