CN114898933A - Composite double-layer fireproof flame-retardant cable and preparation method thereof - Google Patents

Composite double-layer fireproof flame-retardant cable and preparation method thereof Download PDF

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CN114898933A
CN114898933A CN202111529919.6A CN202111529919A CN114898933A CN 114898933 A CN114898933 A CN 114898933A CN 202111529919 A CN202111529919 A CN 202111529919A CN 114898933 A CN114898933 A CN 114898933A
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layer
conductor
fireproof
mica
cable
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CN114898933B (en
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张坤
姚云翔
倪冬华
沈健彬
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Zhejiang Zhaolong Interconnect Technology Co ltd
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Zhejiang Zhaolong Interconnect Technology 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
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/08—Screens specially adapted for reducing cross-talk
    • 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
    • H01B13/02—Stranding-up
    • 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
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
    • 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
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
    • 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
    • H01B3/441—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 alkenes
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/2224—Magnesium hydroxide
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Abstract

The invention provides a composite double-layer fireproof flame-retardant cable and a preparation method thereof, and belongs to the technical field of cables. The invention relates to a composite double-layer fireproof flame-retardant cable which comprises a core conductor, a plurality of second conductor units stranded around the core conductor, a low-smoke halogen-free polyolefin layer wound on the periphery of the second conductor units, and a sheath layer, wherein a low-smoke halogen-free polyolefin filler is filled between the core conductor and the second conductor units. The invention also discloses a preparation method of the composite double-layer fireproof flame-retardant cable. The double-layer reverse-wrapping mica fireproof belt solves the problem that the lamination degree and the stress-free property of the fireproof layer are affected by the fold formed by uneven stress of the fireproof layer, improves the lamination degree of the cable core by adopting a back-twisting and wire-releasing process, improves the oxygen isolation capability of the cable core, and improves the fireproof and flame-retardant performance of the cable. Meanwhile, nanoparticles are added into the low-smoke halogen-free polyolefin filling layer to improve the flame retardance, the mechanical property and the electrical property.

Description

Composite double-layer fireproof flame-retardant cable and preparation method thereof
Technical Field
The invention belongs to the technical field of cables, and particularly relates to a composite double-layer fireproof flame-retardant cable and a preparation method thereof.
Background
A cable is a conductor made of one or more conductors insulated from each other and an outer insulating sheath that carries power or information from one location to another. Typically a rope-like cable made up of several or groups of conductors (at least two in each group) twisted together, with the conductors of each group being insulated from one another and often twisted around a center, the entire outer surface being coated with a highly insulating coating. The cable has the characteristics of internal electrification and external insulation.
The cable includes power cable, control cable, compensation cable, shielding cable, high-temperature cable, computer cable, signal cable, coaxial cable, fire-resistant cable, marine cable, mining cable, aluminum alloy cable and the like. They are composed of single or multi-strand wires and insulating layers, and are used for connecting circuits, electric appliances and the like.
The electric wire and cable products adopted by the electric power system mainly comprise an overhead bare wire, a bus bar (bus), an electric power cable (plastic cable, oilpaper cable (basically replaced by the plastic electric power cable), a rubber sleeve cable, an overhead insulated cable), a branch cable (replacing part of the bus), an electromagnetic wire, an electric equipment wire and cable for electric power equipment and the like.
The electric wire and cable used for the information transmission system mainly include a local telephone cable, a television cable, an electronic cable, a radio frequency cable, an optical fiber cable, a data cable, an electromagnetic wire, an electric power communication or other composite cables and the like.
The manufacture of wire and cable is quite different from the way most electromechanical products are produced. Electromechanical products typically employ the assembly of parts into components, and the reassembly of multiple parts into a single product, with the product being metered in units or pieces. The wire and cable are in basic unit of measurement of length. All the electric wires and cables are manufactured by processing conductors, and adding insulation, shielding, cabling, sheath layers and the like layer by layer on the periphery of the conductors to manufacture electric wire and cable products. The more complex the product structure, the more levels are superimposed.
When the cables cross each other, the high voltage cable should be below the low voltage cable. If one of the cables is either protected by a pipe penetrating within 1m of the front and back of the crossing point or separated by a partition, the minimum allowable distance is 0.25 m. The minimum distances of parallelism and crossovers are 0.5m and 0.25m, respectively, when the cable is close to or crossed over the thermal conduit, if insulation measures are taken. When the cable crosses the railway or the road, the cable is protected by a penetrating pipe, and the protective pipe extends out of 2m of the track or the road surface. The distance between the cable and the building foundation can ensure that the cable is buried outside the water of the building, the cable is protected by penetrating a pipe when being led into the building, and the protective pipe is beyond the water of the building. The distance between the cable directly buried underground and the ground of a common grounding device is 0.25-0.5 m, the buried depth of the cable directly buried underground is not less than 0.7m generally, and the cable is buried under a frozen soil layer.
The cable protective sleeve is used for protecting the cable, and has the advantages of 1, good corrosion resistance, long service life and capability of being used in a humid saline-alkali zone. 2. The flame retardant and heat resistant properties are good, and the flame retardant can be used at a high temperature of 130 ℃ for a long time without deformation and can not burn when meeting fire. 3. High strength and rigidity. The concrete protective layer is not required to be added when the cable is directly buried under a traffic lane, and the construction progress of the cable engineering can be quickened. 4. The cable protection sleeve is a pipe or a pipe fitting which has certain flexibility and can resist damage caused by external heavy pressure and foundation settlement. 5. Has good performance of resisting external signal interference. 6. The inner wall is smooth and does not scratch the cable. The design adopts the connected mode of socket joint formula, and is connected easy to assemble. The joint is sealed by a rubber sealing ring, so that the joint adapts to expansion with heat and contraction with cold and prevents mud and sand from entering.
Published Chinese patent with application number CN201520631192.6 discloses a fire-retardant flexible fireproof cable of low smoke and zero halogen, cable conductor including stranded copper conductor, cable conductor surface covering has the insulating layer, the surface covering of insulating layer has the copper sheath, the surface covering of copper sheath has the restrictive coating, the restrictive coating is low smoke and zero halogen restrictive coating. The utility model discloses in, set up the restrictive coating in the copper protective layer outside into low smoke and zero halogen restrictive coating. On the one hand, the low smoke zero halogen restrictive coating can wrap up and protect inside copper protective layer, and then protects inside insulating layer and cable conductor not to corrode and damage. On the other hand, the low-smoke halogen-free sheath layer is made of rubber materials which do not contain halogen, lead, cadmium, chromium, mercury and other substances, can not generate a large amount of smoke during combustion, can not release corrosive gas and toxic gas to cause harm to human bodies, and has better safety and environmental protection characteristics.
In the aspect of a processing technology of a fire-resistant layer, a single-layer mica tape dragging and wrapping technology is mostly adopted for the fire-resistant layer of the traditional fire-resistant cable technology. The reattachment rate of the dragging process is usually below 35%, the dragging angle is usually about 30 degrees, the width of the mica tape must be increased by increasing the overlapping rate, the consistency of stress is difficult to ensure by two edges of the mica tape after the width is increased, and the problem of folds or raised edges often occurs. Mica does not conform smoothly to the conductor. Under the condition of fire supply, flame is easy to intrude from the tilted side wall of the mica tape, so that two surfaces of the mica tape are simultaneously baked by fire to accelerate embrittlement and lose fire resistance; 2. in the aspect of a stranding process, the traditional flame-retardant fire-resistant stranded wire is actively or passively laid out, the stress of the stranded wire is large, and a single wire is twisted together in a snake-shaped twist mode. The cable is difficult to stably attach to each other, gaps among the stranded cable cores are large, and the hollow structure of the cable in a fire state reduces the overall flame retardant capability of the cable due to air convection formed by the chimney effect.
Disclosure of Invention
In view of the above, the invention provides a composite double-layer fireproof flame-retardant cable and a preparation method thereof, the problem that the fit degree and the stress of a fireproof layer are affected by folds formed by uneven stress of the fireproof layer is solved by adopting a double-layer reverse-wrapping mica fireproof belt, the fit degree of a cable core is improved by adopting a back-twisting wire-paying off process, the oxygen isolation capability of the cable core is improved, and the fireproof flame-retardant performance of the cable is improved. Meanwhile, nanoparticles are added into the low-smoke halogen-free polyolefin filling layer to improve the flame retardance, the mechanical property and the electrical property.
The invention relates to a composite double-layer fireproof flame-retardant cable which comprises a core conductor, a plurality of second conductor units, a low-smoke halogen-free polyolefin layer and a sheath layer, wherein the second conductor units are twisted around the core conductor, the low-smoke halogen-free polyolefin layer is coated on the periphery of the second conductor units, and a low-smoke halogen-free polyolefin filler is filled between the core conductor and the second conductor units; the core conductor comprises a first conductor, a mica fireproof belt 1 wrapped on the first conductor and an insulating belt 2 wrapped outside the mica fireproof belt 1; the second conductor unit comprises a second conductor, a mica fireproof belt 2 wrapped on the periphery of the second conductor, and an insulating belt 2 wrapped on the outer side of the mica fireproof belt 2.
The first and second conductors may be copper conductors. A plurality of second conductor units enclose into a circle, contact each other between the second conductor unit, but not contact with the core conductor, and fill low smoke and zero halogen polyolefin filler (strip) between core conductor, the second conductor unit, the cable in this application is the cable that is used for two-way signal transmission, so the signal of transmission is different in core conductor, the second conductor unit, and the design of discontiguous like this can avoid mutual interference between the two-way signal, avoids signal interference.
The fire-resistant mica tape for the fire-resistant cable is a high-performance mica insulating product, has excellent high-temperature resistance and combustion resistance, has good flexibility in a normal state, is suitable for a main fire-resistant insulating layer in the fire-resistant cable, and basically does not volatilize harmful smoke when burning in open fire, so that the product is effective and safe when being used for the cable.
The low-smoke halogen-free polyolefin layer has good flame retardant and high temperature resistance, and the sheath layer has the function of preventing the insulating layer from contacting with water, air or other objects, preventing the insulating layer from being affected with damp and preventing the insulating layer from being damaged by machinery.
Preferably, the number of the second conductor units is 7.
Preferably, the low-smoke halogen-free polyolefin layer and the low-smoke halogen-free polyolefin filler are
The material is a rubber blend added with nano aluminum hydroxide and nano magnesium hydroxide.
A preparation method of the composite double-layer fireproof flame-retardant cable based on the above description comprises the following steps;
(1) respectively wrapping a first layer of mica tape on the first conductor and the second conductor, and then reversely wrapping
Wrapping a second layer of mica tape to the wrapping direction, wherein the wrapping angle is 45 degrees, and obtaining a first conductor wrapped with the mica fireproof tape 1 and a second conductor wrapped with the mica fireproof tape 2; the mica fireproof tape 1/mica fireproof tape 2 is composed of a first layer of mica tape and a second layer of mica tape which are opposite in wrapping direction, the width of the first layer of mica tape and the width of the second layer of mica tape are 6mm, the thickness of the first layer of mica tape and the second layer of mica tape are 0.14mm, and the wrapping tension is 14-16N. The width of the first mica tape layer and the second mica tape layer is 3.5 times of the diameter of the first conductor;
for the overlapping density and the laminating degree that improve the flame retardant coating in this application, mica fire tape 1 and mica fire tape 2 are double-deck reverse around the package technology by traditional individual layer tow package technology change. Because the wrapping process controls the wrapping tension by adjusting the wrapping angle through the mechanical rod and controlling the wrapping tension through the electronic tension, the controllability is stronger. The manual sand table is pushed to wrap at an angle of 45 degrees, so that the mica tape fireproof tape and the conductor can be smoothly and uniformly attached together. According to theoretical calculation, when the width of the first mica tape layer and the width of the second mica tape layer are 3.5 times of the diameter of the wrapped conductor, the 45-degree wrapping overlapping rate of the first mica tape layer can reach about 55%. The mica tapes of the same process are reversely wound, so that the sticking rate of the fire-resistant layer can reach more than 200%, the first layer of mica tape and the second layer of mica tape are pressed together in opposite directions, flame basically has no chance to spread inwards through mica winding gaps in a fire supply state, the inner layer of mica tape is hardly directly baked by flame, the temperature can only be transmitted from the outer layer of mica to the inner surface, the flame contact area of the fire-resistant layer is reduced, and the fire resistance of the mica fire-resistant tape is improved.
The mica fireproof belt is perfectly attached to the conductor and is close to vacuum, the second mica layer oppositely wrapped is completely and tightly pressed and fixed with the first mica layer on the inner layer, and the stability of the structure between the single-layer mica belt and the conductor is enhanced. The mica fireproof tape adopting the double-layer wrapping process technology has the advantages that the adhesion degree is more compact, the space between the conductor and the mica is firmer, the space is close to vacuum, only the surface is heated and calcined in the burning and firing process, the heating is more uniform, flame does not have the opportunity to spread to the inner layer from gaps of the mica fireproof tape, the mica layer cannot be locally deformed due to nonuniform firing, and the fire resistance of the mica fireproof tape can be obviously improved.
(2) The first conductor wrapped with the mica fireproof tape 1/the first conductor wrapped with the mica fireproof tape 2
Coating the second conductor with an insulating tape 1/an insulating tape 2 to obtain a core conductor and a second conductor unit;
(3) mixing polyethylene, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, and their mixture
Melting and mixing the solvent uniformly on a double-roller open mill at the temperature of 130 ℃ and 140 ℃, then sequentially adding nano magnesium hydroxide and nano aluminum hydroxide, blending, extruding and forming to prepare a low-smoke halogen-free polyolefin layer and a low-smoke halogen-free polyolefin filler in parts by weight; 40-46 parts of polyethylene, 23-29 parts of ethylene-vinyl acetate copolymer, 6-9 parts of ethylene-octene copolymer and 10-13 parts of compatilizer are melted and mixed uniformly on a double-roll open mill, and then 30-43 parts of nano magnesium hydroxide and 24-32 parts of nano aluminum hydroxide are added successively;
polyethylene, ethylene-vinyl acetate copolymer and ethylene-octene copolymer are used as rubber substrates, and have good flame-retardant and high-temperature-resistant effects. The inorganic hydroxide can obviously improve the flame retardant property of the composite material, the nano particles change the trap density and depth in the polymer material, influence the carrier migration, change the conductivity and effectively inhibit the space charge accumulation, have an inhibiting effect on the space charge, improve the dielectric property of the insulating material and simultaneously play a good role in improving the mechanical property of the material.
(4) Core conductor as center, low smoke halogen-free polyolefin filler in middle, second conductor
The units are stranded together at the outermost periphery through stress-free untwisted strands to obtain a cable initial blank;
the stress-free untwisted wire is formed by providing a force with opposite force in one direction and equal strength to the single wire in advance and offsetting the force in the twisting process. Through debugging repeatedly, 100% back-twist stress can offset the release completely, and each single line homoenergetic keeps straight smooth and easy state stranded together, and the laminating that can be even stable is in the same place between the single line to reduced the inside gap of cable core, middle gap department increases fire-retardant packing, has effectively reduced cable in-core air capacity, has realized the inside "null space" of cable core process design, and the cable separates the oxygen effect and can promote, has reached fire-retardant effect.
In the traditional paying-off process, because the straight-pulling paying-off is adopted, the stress of the stranded wires cannot be released, and the stranded wires are difficult to smoothly adhere to each other. And to improve the fitting degree of the cable core, the stress generated in the stranding process needs to be released so that the single wires are smoothly stranded together. The working principle of the untwisting paying-off line is that the insulated single wire is firstly twisted for a certain angle along the direction opposite to the revolution direction (also the rotation direction) of the insulated single wire when twisted, and force is equivalently formed behind the twisted wire to offset so as to realize untwisting. The working principle is shown in fig. 1. In fig. 1, after the insulated single wire is paid out from the reel, the single wire is twisted in the left direction by the rotation of the BOW1 or BOW2, and the single wire is rotated two revolutions per revolution of the BOW. Each pre-twisted single wire passes through the twisting BOW BOW3 twisted wire, at the moment, the wire core forms a right-hand twisted wire, and the corresponding single wire forms a right-hand twist.
(5) Sequentially coating a low-smoke halogen-free polyolefin layer and a sheath layer on the periphery of the cable primary blank,
and obtaining the double-layer fireproof flame-retardant cable.
The lapping refers to a process of spirally winding a lapping tape on a conductor by the circular motion of lapping of a lapping machine and the linear motion of a traction wheel, wherein the lapping is carried out in the lapping process, and the lapping is generally used for processing a material layer which needs to ensure the insulativity and resist high temperature inside a cable; the cladding means that the cladding periphery is directly wrapped up by the cover of same thickness, and not twine up, is through cladding machine direct cladding, and the layer that forms is totally enclosed, can not appear the clearance, and this is generally used for the processing of cable sheath layer, because the main effect of restrictive coating is in order to keep off water, keeps off other interference thing.
The problem that the non-uniform stress of the fire-resistant layer forms folds to influence the adhesion degree and the stress-free property of the fire-resistant layer is solved by adopting the double-layer reverse wrapping mica fireproof belt, the adhesion degree of a cable core is improved by adopting a back-twist wire releasing process, the oxygen isolation capacity of the cable core is improved, and the fire-resistant flame-retardant performance of the cable is improved. Meanwhile, nanoparticles are added into the low-smoke halogen-free polyolefin filling layer to improve the flame retardance, the mechanical property and the electrical property. Meanwhile, the nano hydroxide is added into the low-smoke halogen-free polyolefin layer and the low-smoke halogen-free polyolefin filler, so that the high-temperature-resistant insulating capability is ensured, and the mechanical property and the dielectric property of the low-smoke halogen-free polyolefin filler are improved.
Drawings
FIG. 1 is a schematic diagram of the operation of a back twist pay line in the context of the present invention;
fig. 2 is a schematic structural diagram of a composite double-layer fireproof flame-retardant cable according to an embodiment of the present invention.
Detailed Description
Example 1
Referring to fig. 1, a composite double-layer fireproof flame-retardant cable includes a core conductor, a plurality of second conductor units twisted around the core conductor, a low-smoke halogen-free polyolefin layer covering the periphery of the second conductor units, and a sheath layer, wherein a low-smoke halogen-free polyolefin filler is filled between the core conductor and the second conductor units; the core conductor comprises a first conductor, a mica fireproof belt 1 wrapped on the first conductor and an insulating belt 2 wrapped outside the mica fireproof belt 1; the second conductor unit comprises a second conductor, a mica fireproof belt 2 wrapped on the periphery of the second conductor, and an insulating belt 2 wrapped on the outer side of the mica fireproof belt 2.
The number of the second conductor units is 7. The low-smoke halogen-free polyolefin layer and the low-smoke halogen-free polyolefin filler are made of a rubber blend added with nano aluminum hydroxide and nano magnesium hydroxide.
A preparation method of the composite double-layer fireproof flame-retardant cable based on the above description comprises the following steps;
(1) respectively wrapping a first layer of mica tape on the first conductor and the second conductor, and then reversely wrapping
Wrapping a second layer of mica tape, wherein the wrapping angle is 45 degrees, so that a first conductor wrapped with the mica fireproof tape 1 and a second conductor wrapped with the mica fireproof tape 2 are obtained; the mica fireproof tape 1/the mica fireproof tape 2 is composed of a first layer of mica tape and a second layer of mica tape which are opposite in wrapping direction, the width of the first layer of mica tape and the width of the second layer of mica tape are 6mm, the thickness of the first layer of mica tape and the thickness of the second layer of mica tape are 0.14mm, the wrapping tension is 14N, and the width of the first layer of mica tape and the width of the second layer of mica tape are 3.5 times of the diameter of a first conductor;
(2) the first conductor wrapped with the mica fireproof tape 1/the first conductor wrapped with the mica fireproof tape 2
The second conductor is coated with an insulating tape 1/an insulating tape 2 to obtain a core conductor and a second conductor unit;
(3) mixing polyethylene, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, and their mixture
Melting and mixing the solvent uniformly on a double-roller open mill at 130 ℃, then successively adding nano magnesium hydroxide and nano aluminum hydroxide, blending, extruding and forming to prepare a low-smoke halogen-free polyolefin layer and a low-smoke halogen-free polyolefin filler in parts by weight; 40 parts of polyethylene, 23 parts of ethylene-vinyl acetate copolymer, 6 parts of ethylene-octene copolymer and 10 parts of compatilizer are melted and mixed uniformly on a double-roll mill, and then 30 parts of nano magnesium hydroxide and 24 parts of nano aluminum hydroxide are added successively;
(4) core conductor as center, low smoke halogen-free polyolefin filler in middle, second conductor
The units are stranded together at the outermost periphery through stress-free untwisted strands to obtain a cable initial blank;
(5) sequentially coating a low-smoke halogen-free polyolefin layer and a sheath on the periphery of the cable primary blank
And (5) layering to obtain the double-layer fireproof flame-retardant cable.
Example 2
The embodiment is similar to embodiment 1, except that the lapping tension of the mica tape in the embodiment is 15N; the melting temperature is 140 ℃, calculated by weight portion; 42 parts of polyethylene, 25 parts of ethylene-vinyl acetate copolymer, 7 parts of ethylene-octene copolymer and 12 parts of compatilizer are melted and mixed uniformly on a double-roll mill, and then 35 parts of nano magnesium hydroxide and 27 parts of nano aluminum hydroxide are added successively.
Example 3
The present embodiment is similar to embodiment 1, except that the lapping tension of the mica tape in the present embodiment is 16N; the melting temperature is 135 ℃, calculated by weight portion; 46 parts of polyethylene, 29 parts of ethylene-vinyl acetate copolymer, 9 parts of ethylene-octene copolymer and 13 parts of compatilizer are melted and mixed uniformly on a double-roll mill, and then 43 parts of nano magnesium hydroxide and 32 parts of nano aluminum hydroxide are added successively.
The double-layer reverse-wrapping mica fireproof belt solves the problem that the lamination degree and the stress-free property of the fireproof layer are affected by the fold formed by uneven stress of the fireproof layer, improves the lamination degree of the cable core by adopting a back-twisting and wire-releasing process, improves the oxygen isolation capability of the cable core, and improves the fireproof and flame-retardant performance of the cable. Meanwhile, nanoparticles are added into the low-smoke halogen-free polyolefin filling layer to improve the flame retardance, the mechanical property and the electrical property. Meanwhile, the nano hydroxide is added into the low-smoke halogen-free polyolefin layer and the low-smoke halogen-free polyolefin filler, so that the high-temperature-resistant insulating capability is ensured, and the mechanical property and the dielectric property of the low-smoke halogen-free polyolefin filler are improved.

Claims (9)

1. A composite double-layer fireproof flame-retardant cable is characterized by comprising a core conductor, a plurality of second conductor units stranded around the core conductor, a low-smoke halogen-free polyolefin layer coated on the periphery of the second conductor units, and a sheath layer, wherein a low-smoke halogen-free polyolefin filler is filled between the core conductor and the second conductor units; the core conductor comprises a first conductor, a mica fireproof belt 1 wrapped on the first conductor and an insulating belt 2 wrapped outside the mica fireproof belt 1; the second conductor unit comprises a second conductor, a mica fireproof belt 2 wrapped on the periphery of the second conductor, and an insulating belt 2 wrapped on the outer side of the mica fireproof belt 2.
2. A composite double-layer fireproof flame-retardant cable according to claim 1, wherein the number of the second conductor units is 7.
3. The composite double-layer fireproof flame-retardant cable according to claim 1, wherein the low-smoke halogen-free polyolefin layer and the low-smoke halogen-free polyolefin filler are made of a rubber blend added with nano aluminum hydroxide and nano magnesium hydroxide.
4. A method for preparing a composite double-layer fireproof flame-retardant cable according to any one of claims 1 to 3, characterized by comprising the following steps;
respectively wrapping a first layer of mica tape on the first conductor and a second layer of mica tape on the second conductor, and then reversely wrapping a second layer of mica tape, wherein the wrapping angle is 45 degrees, so that the first conductor wrapped with the mica fireproof tape 1 and the second conductor wrapped with the mica fireproof tape 2 are obtained;
coating an insulating tape 1/an insulating tape 2 on a first conductor wrapped with a mica fireproof tape 1/a second conductor wrapped with a mica fireproof tape 2 to obtain a core conductor and a second conductor unit;
melting and uniformly mixing polyethylene, ethylene-vinyl acetate copolymer, ethylene-octene copolymer and compatilizer, then successively adding nano magnesium hydroxide and nano aluminum hydroxide, blending, extruding and molding to prepare a low-smoke halogen-free polyolefin layer and a low-smoke halogen-free polyolefin filler;
the core conductor is the center, the low-smoke halogen-free polyolefin filler is arranged in the middle, the second conductor unit is arranged at the outermost periphery, and the core conductor and the second conductor unit are twisted together through a stress-free untwisted strand to obtain a cable initial blank;
and sequentially coating a low-smoke halogen-free polyolefin layer and a sheath layer on the periphery of the primary cable blank to obtain the double-layer fireproof flame-retardant cable.
5. The preparation method of the composite double-layer fireproof flame-retardant cable according to claim 4, wherein the width of the first mica tape and the width of the second mica tape are 6mm, and the thickness of the first mica tape and the second mica tape are 0.14 mm.
6. The method for preparing the composite double-layer fireproof flame-retardant cable according to claim 4, wherein in the step (3), the components are calculated according to parts by weight; 40-46 parts of polyethylene, 23-29 parts of ethylene-vinyl acetate copolymer, 6-9 parts of ethylene-octene copolymer and 10-13 parts of compatilizer are melted and mixed uniformly, and then 30-43 parts of nano magnesium hydroxide and 24-32 parts of nano aluminum hydroxide are added successively.
7. The method as claimed in claim 6, wherein the melting temperature in step (3) is 130-140 ℃.
8. The preparation method of the composite double-layer fireproof flame-retardant cable according to claim 4, wherein the tension of the wrapping in the step (1) is 14-16N.
9. The preparation method of the composite double-layer fireproof flame-retardant cable according to claim 4, wherein the width of the first mica tape and the second mica tape is 3.5 times of the diameter of the first conductor.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103187120A (en) * 2011-12-29 2013-07-03 张庆 Reusable fire-resistant cable
WO2016145689A1 (en) * 2015-03-18 2016-09-22 中天科技装备电缆有限公司 Intrinsically safe oil-resistant and mud-resistant fireproof cable for offshore platform and manufacturing process
JP2017062912A (en) * 2015-09-24 2017-03-30 矢崎エナジーシステム株式会社 Fire-resistant cable and fire-resistant insulated wire core
CN207718911U (en) * 2017-12-12 2018-08-10 中国西电集团有限公司 A kind of ceramic polyolefin fire resistant flame retardant cable
AU2019100250A4 (en) * 2018-11-09 2019-05-09 Jiangsu Hengtong Power Cable Co., Ltd. Optical Fiber Composite Fireproof Cable and Intelligent Early Warning Communication Device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103187120A (en) * 2011-12-29 2013-07-03 张庆 Reusable fire-resistant cable
WO2016145689A1 (en) * 2015-03-18 2016-09-22 中天科技装备电缆有限公司 Intrinsically safe oil-resistant and mud-resistant fireproof cable for offshore platform and manufacturing process
JP2017062912A (en) * 2015-09-24 2017-03-30 矢崎エナジーシステム株式会社 Fire-resistant cable and fire-resistant insulated wire core
CN207718911U (en) * 2017-12-12 2018-08-10 中国西电集团有限公司 A kind of ceramic polyolefin fire resistant flame retardant cable
AU2019100250A4 (en) * 2018-11-09 2019-05-09 Jiangsu Hengtong Power Cable Co., Ltd. Optical Fiber Composite Fireproof Cable and Intelligent Early Warning Communication Device

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