CN111518359A - High-voltage cable and preparation method thereof - Google Patents

High-voltage cable and preparation method thereof Download PDF

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Publication number
CN111518359A
CN111518359A CN202010259247.0A CN202010259247A CN111518359A CN 111518359 A CN111518359 A CN 111518359A CN 202010259247 A CN202010259247 A CN 202010259247A CN 111518359 A CN111518359 A CN 111518359A
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China
Prior art keywords
parts
layer
polyolefin
voltage cable
conductor
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CN202010259247.0A
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Chinese (zh)
Inventor
李冬福
付广
张远烽
薄强龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Woer Heat Shrinkable Material Co Ltd
Huizhou LTK Electronic Cable Co Ltd
LTK Electric Wire Huizhou Co Ltd
LTK Electric Wire Changzhou Co Ltd
Shenzhen Woer Special Cable Co Ltd
Original Assignee
Shenzhen Woer Heat Shrinkable Material Co Ltd
Huizhou LTK Electronic Cable Co Ltd
LTK Electric Wire Huizhou Co Ltd
LTK Electric Wire Changzhou Co Ltd
Shenzhen Woer Special Cable Co Ltd
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Application filed by Shenzhen Woer Heat Shrinkable Material Co Ltd, Huizhou LTK Electronic Cable Co Ltd, LTK Electric Wire Huizhou Co Ltd, LTK Electric Wire Changzhou Co Ltd, Shenzhen Woer Special Cable Co Ltd filed Critical Shenzhen Woer Heat Shrinkable Material Co Ltd
Priority to CN202010259247.0A priority Critical patent/CN111518359A/en
Publication of CN111518359A publication Critical patent/CN111518359A/en
Withdrawn legal-status Critical Current

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    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • 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
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    • H—ELECTRICITY
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    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • 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
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    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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    • 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
    • H01B9/00—Power cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/021—Features relating to screening tape per se
    • 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
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Abstract

The invention relates to the technical field of cables, and discloses a high-voltage cable and a preparation method thereof, wherein the high-voltage cable comprises a polyolefin composition, and the polyolefin composition comprises the following components in parts by weight: 5-20 parts of propylene ethylene copolymer, 5-15 parts of medium density polyethylene, 5-25 parts of ethylene-octene copolymer, 20-25 parts of styrene-butadiene-styrene block copolymer, 2-8 parts of hydrogenated polyolefin resin, 3-5 parts of maleic anhydride, 1-2 parts of silicone powder, 10-15 parts of aluminum hydroxide, 5-10 parts of divinyl aluminum hypophosphite, 10-15 parts of melamine uric acid, 1-2 parts of antioxidant, 0.2-0.4 part of copper inhibitor, 1-2 parts of polysiloxane elastomer, 2-3 parts of silane coupling agent, 0.2-0.4 part of light stabilizer, 0.1-0.2 part of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 0.5-2 parts of triallyl isocyanurate. Therefore, the polyolefin composition can ensure that the high-voltage cable has excellent tear resistance and hydrolysis resistance.

Description

High-voltage cable and preparation method thereof
Technical Field
The invention relates to the technical field of cables, in particular to a high-voltage cable and a preparation method thereof.
Background
At present, high-voltage cables are generally applied to power connection in new energy vehicles and inside power battery packs, and most of the existing high-voltage cables are coated outside conductor layers by polyolefin materials to form insulating sheaths, so that the high-voltage cables are insulated, and the damage of the environment to the conductor layers is avoided.
However, the environment in which the high-voltage cable is applied is relatively harsh and complex, on one hand, the high-voltage cable is relatively stressed in the transverse direction and the longitudinal direction in the automobile, and is subjected to large tensile stress and other stress in the installation process and the use process, while the conventional high-voltage cable is relatively poor in external force tearing resistance and can break after being subjected to stress for a long time; on the other hand, the bottom of the automobile is easy to be stained with water, particularly in rainy days, the high-voltage cable can be soaked in the rainwater for a long time, so that the insulating sheath can be hydrolyzed, the conductor layer is exposed, the electricity is leaked, and safety accidents are caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a tear-resistant and hydrolysis-resistant high-voltage cable. Another object is to provide a method for preparing the high voltage cable.
The purpose of the invention is realized by the following technical scheme:
a high-voltage cable comprises a first conductor layer and a first outer tegument layer coated outside the first conductor layer;
the material of the first outer layer is a polyolefin composition, and the polyolefin composition comprises the following components in parts by mass: 5-20 parts of propylene ethylene copolymer, 5-15 parts of medium density polyethylene, 5-25 parts of ethylene-octene copolymer, 20-25 parts of styrene-butadiene-styrene block copolymer, 2-8 parts of hydrogenated polyolefin resin, 3-5 parts of maleic anhydride, 1-2 parts of silicone powder, 10-15 parts of aluminum hydroxide, 5-10 parts of divinyl aluminum hypophosphite, 10-15 parts of melamine uric acid, 1-2 parts of antioxidant, 0.2-0.4 part of copper inhibitor, 1-2 parts of polysiloxane elastomer, 2-3 parts of silane coupling agent, 0.2-0.4 part of light stabilizer, 0.1-0.2 part of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 0.5-2 parts of triallyl isocyanurate.
A high-voltage cable comprises a second conductor layer, an insulating layer, an aluminum foil layer, a weaving layer and a second outer tegument layer, wherein the insulating layer is arranged outside the second conductor layer, the aluminum foil layer is coated outside the insulating layer, the weaving layer is coated outside the aluminum foil layer, and the second outer tegument layer is coated outside the weaving layer;
wherein the insulating layer and the second outer layer are both made of the polyolefin composition.
A preparation method of a high-voltage cable comprises the following steps:
mixing the polyolefin composition to obtain a polyolefin melt; granulating the polyolefin melt to obtain polyolefin granules;
extruding the polyolefin granules outside a first conductor layer to form a first outer covering layer, and carrying out primary irradiation crosslinking on the first outer covering layer; the first conductor layer and the first outer layer jointly form a high-voltage cable.
In one embodiment, before the operation of extruding the polyolefin pellets outside the first conductor layer to form the first outer coating layer, a plurality of conductor monofilaments are bundled to obtain a bundled conductor; and twisting the bundle wire conductor to obtain the first conductor layer.
In one embodiment, the mixing temperature is 120-200 ℃, and the mixing time is 15-60 min.
In one embodiment, the granulation temperature is from 130 ℃ to 160 ℃.
In one embodiment, the irradiation dose of the single irradiation crosslinking is 10M to 18M.
A preparation method of a high-voltage cable comprises the following steps:
mixing the polyolefin composition to obtain a polyolefin melt; granulating the polyolefin melt to obtain polyolefin granules;
extruding the polyolefin granules outside a second conductor layer to form an insulating layer, and carrying out primary irradiation crosslinking on the insulating layer;
coating an aluminum foil layer outside the insulating layer;
weaving tinned copper braided wires outside the aluminum foil layer to form a braided layer;
extruding the polyolefin granules outside the braided layer to form a second outer covering layer, and carrying out secondary irradiation crosslinking on the second outer covering layer; the second conductor layer, the insulating layer, the aluminum foil layer, the braid and the second outer layer together form a high-voltage cable.
In one embodiment, the irradiation dose of the secondary irradiation crosslinking is 10M to 18M.
In one embodiment, the aluminum foil layer is coated by coating or magnetron sputtering.
Compared with the prior art, the invention has at least the following advantages:
according to the high-voltage cable, the outer layer and the insulating layer of the high-voltage cable are made of propylene-ethylene copolymer, styrene-butadiene-styrene block copolymer, medium-density polyethylene and ethylene-octene copolymer as matrix resin, and triallyl isocyanurate as a photoinitiator, and the matrix resin, the triallyl isocyanurate and the ethylene-octene copolymer are initiated to be mutually cross-linked and cured to form a resin net structure under the irradiation of electron beams, so that the whole system has excellent tear resistance and hydrolysis resistance; the tearing resistance of the whole system is improved through the synergistic effect of the hydrogenated polyolefin resin and the matrix resin; then forming a bonding film on the surface of the resin net structure by N, N' -bis (2, 6-diisopropylphenyl) carbodiimide, and improving the hydrolysis resistance of the whole system; the high-voltage cable can adapt to a severe and complex environment to well protect the conductor layer, and the problem that the conventional high-voltage cable is broken due to long-term stress can be solved; the problem of hydrolysis can take place for a long time to soak in the rainwater in current high tension cable can be solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a high-voltage cable according to a first embodiment of the present invention.
Fig. 2 is a schematic structural view of a high-voltage cable according to a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a high voltage cable according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating steps of a method for manufacturing a high voltage cable according to a second embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In a first embodiment, referring to fig. 1, a high voltage cable 10 includes a first conductive layer 110 and a first outer layer 120 covering the first conductive layer 110. The material of the first outer layer 120 is a polyolefin composition, and the polyolefin composition comprises the following components in parts by mass: 5-20 parts of propylene ethylene copolymer, 5-15 parts of medium density polyethylene, 5-25 parts of ethylene-octene copolymer, 20-25 parts of styrene-butadiene-styrene block copolymer, 2-8 parts of hydrogenated polyolefin resin, 3-5 parts of maleic anhydride, 1-2 parts of silicone powder, 10-15 parts of aluminum hydroxide, 5-10 parts of divinyl aluminum hypophosphite, 10-15 parts of melamine uric acid, 1-2 parts of antioxidant, 0.2-0.4 part of copper inhibitor, 1-2 parts of polysiloxane elastomer, 2-3 parts of silane coupling agent, 0.2-0.4 part of light stabilizer, 0.1-0.2 part of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 0.5-2 parts of triallyl isocyanurate.
In the invention, a propylene-ethylene copolymer (abbreviated as PLE), a styrene-butadiene-styrene block copolymer (abbreviated as SEBS), a medium density polyethylene (abbreviated as MDPE) and an ethylene-octene copolymer (abbreviated as POE) are selected as matrix resins, and triallyl isocyanurate (abbreviated as TAIC) is selected as a photoinitiator, and the matrix resins, the triallyl isocyanurate and the triallyl isocyanurate are mutually cross-linked and cured to form a resin network structure under the irradiation of electron beams. The medium density polyethylene has high mechanical strength and tearing strength and high crystallinity, so that water molecules are difficult to permeate into the medium density polyethylene, and the hydrolysis resistance of the whole resin network structure is improved. The styrene-butadiene-styrene block copolymer is internally composed of a large number of benzene rings, and has excellent hydrolysis resistance. The propylene-ethylene copolymer has excellent toughness, and can improve the toughness of the whole resin network structure when added into a system, thereby improving the tear resistance of the resin network structure. The ethylene-octene copolymer has excellent toughness and low-temperature performance, and the molecules of the ethylene-octene copolymer are long-chain structures and are easy to wind other molecules in a system, so that the other molecules in the system are difficult to slide, and the tear resistance of the whole system can be further improved.
The hydrogenated polyolefin resin has outstanding creep resistance and stress cracking resistance, particularly the spherical multi-branched hydrogenated polyolefin resin, the molecular shape of which is multi-branched spherical macromolecules, is added into the whole system, other molecules in the system can react with the molecules to form hydrogen bonds and the like, particularly, the ethylene-octene copolymer molecules can be interpenetrated and wound on macromolecular branched chains of the ethylene-octene copolymer molecules, so that the molecular sliding of the spherical multi-branched hydrogenated polyolefin resin can be reduced, and the tear resistance of the whole system is improved.
The N, N' -di (2, 6-diisopropylphenyl) carbodiimide has an N ═ C ═ N cumulative double bond structure, can perform addition reaction with hydrogen bond-containing molecules in matrix resin, forms a bonding film on the surface of the resin network structure, prevents water molecules from entering and destroying the resin network structure, improves the hydrolytic stability of the resin network structure, can also play a role in polymer chain scission and replantation, and can greatly improve the hydrolytic resistance of the whole system.
The polysiloxane elastomer and the silicone powder are used as lubricants, so that the fluidity of the melt can be improved, the uniform plasticization of the melt is promoted, the plasticizing temperature is reduced, and the extrusion speed and the surface smoothness and the glossiness of the high-voltage cable are improved.
The aluminum hydroxide, the divinyl aluminum phosphate and the melamine uric acid can improve the flame retardant property of the high-voltage cable, so that the safety coefficient of the high-voltage cable in the using process is higher.
The antioxidant and the copper resisting agent can improve the oxidation resistance of the high-voltage cable and prevent aging, the antioxidant can be antioxidant 1010, antioxidant TH-412S, composite antioxidant KY401 and the like, and particularly the antioxidant function of the composite antioxidant KY401 is optimal.
The light stabilizer can improve the ultraviolet light resistance of the high-voltage cable.
Maleic anhydride and silane coupling agent are used as compatilizers, so that the compatibility among all components can be increased, particularly the compatibility between inorganic matters such as aluminum hydroxide and organic matters such as matrix resin can be increased, the aluminum hydroxide, the divinyl aluminum hypophosphite and the melamine uric acid can be well filled in a resin net structure, the sliding of molecules in the whole system is reduced, and the flame retardant property and the tensile strength of the whole system are improved; the maleic anhydride can be POE grafted maleic anhydride, EBA grafted maleic anhydride and the like, and particularly, the EBA grafted maleic anhydride has the best compatibility with the whole system.
In conclusion, the invention enables the synergistic effect among the components to be optimal by reasonably selecting the proportion of the components, the prepared polyolefin granules have the characteristics of high intermolecular compactness, good chemical resistance, good corrosion resistance, good weather resistance, good electrical insulation, high mechanical strength, good flame retardance, good bending property and the like, particularly have outstanding tear resistance and water resistance, the first outer layer of the high-voltage cable is formed by applying the material, the chemical resistance of the high-voltage cable is greatly improved, the high-voltage cable has the advantages of corrosion resistance, weather resistance, electrical insulation, mechanical strength, flame retardance, bending property, tear resistance and water resistance, can be more suitable for environments with smaller laying bending radius or narrower space, can adapt to severe and complex environments to well protect the first conductor layer, and can solve the problem that the existing high-voltage cable is broken due to long-term stress; the problem of hydrolysis can take place for a long time to soak in the rainwater in current high tension cable can be solved.
For another example, the polyolefin composition comprises the following components in parts by mass: 5 parts of propylene-ethylene copolymer, 5 parts of medium-density polyethylene, 5 parts of ethylene-octene copolymer, 20 parts of styrene-butadiene-styrene block copolymer, 2 parts of hydrogenated polyolefin resin, 3 parts of maleic anhydride, 1 part of silicone powder, 10 parts of aluminum hydroxide, 5 parts of aluminum divinyl hypophosphite, 10 parts of melamine uric acid, 1 part of antioxidant, 0.2 part of copper inhibitor, 1 part of polysiloxane elastomer, 2 parts of silane coupling agent, 0.2 part of light stabilizer, 0.1 part of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 0.5 part of triallyl isocyanurate. This improves chemical resistance, corrosion resistance, weather resistance, electrical insulation, mechanical strength, flame retardancy, flexibility, tear resistance and water resistance of the polyolefin composition.
For another example, the polyolefin composition comprises the following components in parts by mass: 20 parts of propylene-ethylene copolymer, 15 parts of medium-density polyethylene, 25 parts of ethylene-octene copolymer, 25 parts of styrene-butadiene-styrene block copolymer, 8 parts of hydrogenated polyolefin resin, 5 parts of maleic anhydride, 2 parts of silicone powder, 15 parts of aluminum hydroxide, 10 parts of aluminum divinylhypophosphite, 15 parts of melamine uric acid, 2 parts of antioxidant, 0.4 part of copper inhibitor, 2 parts of polysiloxane elastomer, 3 parts of silane coupling agent, 0.4 part of light stabilizer, 0.2 part of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 2 parts of triallyl isocyanurate. This improves chemical resistance, corrosion resistance, weather resistance, electrical insulation, mechanical strength, flame retardancy, flexibility, tear resistance and water resistance of the polyolefin composition.
For another example, the polyolefin composition comprises the following components in parts by mass: 12.5 parts of propylene-ethylene copolymer, 10 parts of medium-density polyethylene, 15 parts of ethylene-octene copolymer, 22.5 parts of styrene-butadiene-styrene block copolymer, 5 parts of hydrogenated polyolefin resin, 4 parts of maleic anhydride, 1.5 parts of silicone powder, 12.5 parts of aluminum hydroxide, 7.5 parts of aluminum divinylhypophosphite, 12.5 parts of melamine uric acid, 1.5 parts of antioxidant, 0.3 part of copper-resistant agent, 1.5 parts of polysiloxane elastomer, 2.5 parts of silane coupling agent, 0.3 part of light stabilizer, 0.15 part of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 1.25 parts of triallyl isocyanurate. This improves chemical resistance, corrosion resistance, weather resistance, electrical insulation, mechanical strength, flame retardancy, flexibility, tear resistance and water resistance of the polyolefin composition.
In a second embodiment, referring to fig. 2, a high voltage cable 20 includes a second conductive layer 210, an insulating layer 220, an aluminum foil layer 230, a braid layer 240 and a second outer coating layer 250, wherein the insulating layer 220 is disposed outside the second conductive layer 210, the aluminum foil layer 230 is coated outside the insulating layer 220, the braid layer 240 is coated outside the aluminum foil layer 230, and the second outer coating layer 250 is coated outside the braid layer 240. Wherein the insulating layer 220 and the second outer layer 250 are made of the polyolefin composition.
Compared with the first embodiment, the high-voltage cable has the advantages that the aluminum foil layer and the braid layer are added, so that the shielding effect on the external magnetic field can be realized, and the good effect of resisting magnetic field interference is achieved; meanwhile, the aluminum foil layer and the braided layer also have the functions of bending resistance, oxidation resistance and heat conduction and radiation, so that the magnetic field interference resistance, oxidation resistance and heat conduction and radiation performance of the high-voltage cable can be improved; the thickness of the second outer coating layer is larger than that of the insulating layer by increasing the insulating layer, and the insulating layer and the second outer coating layer are combined, so that the chemical resistance, corrosion resistance, weather resistance, electrical insulation, mechanical strength, flame resistance, bending property, tear resistance and water resistance of the high-voltage cable can be further improved, the high-voltage cable can be more suitable for severe and complex environments, and the problem that the existing high-voltage cable can break under stress for a long time can be solved; the problem of hydrolysis can take place for a long time to soak in the rainwater in current high tension cable more can be solved.
In one embodiment, referring to fig. 1, a method for manufacturing a high voltage cable includes the following steps:
mixing the polyolefin composition to obtain a polyolefin melt; and granulating the polyolefin melt to obtain polyolefin granules.
Extruding the polyolefin pellets out of the first conductor layer 110 to form a first outer coating layer 120, and performing primary irradiation crosslinking on the first outer coating layer 120; the first conductor layer 110 and the first outer layer 120 together constitute the high voltage cable 10.
In one embodiment, before the operation of extruding the polyolefin pellets outside the first conductor layer to form the first outer covering layer, a plurality of conductor monofilaments are bundled to obtain a bundled conductor; and twisting the bundle wire conductor to obtain the first conductor layer. It can be understood that the first conductor layer is used as a component of the high voltage cable for performing current or electromagnetic transmission function, and in order to make the high voltage cable run at high speed, the cross-sectional area of the first conductor layer should be increased, however, the conductor monofilament with large cross-sectional area is poor in flexibility and inconvenient to bend, and thus is not favorable for production, transportation, installation and laying. Therefore, the annealed thin conductor monofilaments are bundled and twisted and then used as the first conductor layer, so that the conductor monofilaments are softer and can bear larger external bending stress. For another example, the conductor monofilament is an aluminum wire, a copper wire, a silver wire, an alloy wire, or the like; the conductor monofilament is preferably a copper wire.
In one embodiment, the mixing equipment is an internal mixer or an open mill. Because the shearing action of the rubber material is much larger than that of an open mill during the mixing of the internal mixer, the mixing temperature is high, the mixing efficiency of the internal mixer is greatly higher than that of the open mill, and the dispersion uniformity of the polyolefin melt obtained by the mixing of the internal mixer is higher than that of the open mill, the internal mixer is preferably used as the mixing equipment.
In one embodiment, the mixing temperature is 120-200 ℃, and the mixing time is 15-60 min. Generally, as the temperature of the compounding is increased, the melting rate and extent of the polyolefin melt is increased; however, when the compounding temperature exceeds 250 ℃, the components in the polyolefin melt begin to decompose at high temperature, resulting in a decrease in the quality of the polyolefin melt, and macroscopically, the polyolefin melt has a large number of bubbles, and the surface smoothness and gloss thereof are reduced. Therefore, the mixing temperature is preferably 120-200 ℃, and the mixing time is preferably 15-60 min; for example, the mixing temperature is 120 ℃, and the mixing time is 60 min; for example, the mixing temperature is 160 ℃, and the mixing time is 38 min; for example, the temperature of the mixing is 200 ℃ and the time of the mixing is 15 min.
In one embodiment, the granulation temperature is 130 ℃ to 160 ℃. Generally, as the temperature of the granulation is increased, the granulation efficiency is increased; however, when the temperature of pelletization exceeds 160 ℃, the decomposition of the components in the polyolefin pellets begins to occur due to high temperature, resulting in the deterioration of the quality of the polyolefin pellets, the occurrence of a large amount of bubbles in the polyolefin pellets on a macroscopic scale, and the deterioration of the surface smoothness and gloss thereof. Therefore, the temperature of the granulation is preferably 130-160 ℃; for example, the temperature of the granulation is 130 ℃; for example, the temperature of the granulation is 145 ℃; for example, the temperature of the granulation is 160 ℃. As another example, the equipment used for granulation can be a single-screw granulator, a twin-screw granulator, and the like.
In one embodiment, the irradiation dose of the one-time irradiation crosslinking is 10M-18M. Generally, with the increasing of the irradiation dose of the one-time irradiation crosslinking, the action probability of the radiation and the molecules in the irradiated polyolefin granules in unit time is increased, the density of free radicals required for generating crosslinking is increased, the crosslinking reaction is quicker, the crosslinking degree is higher, and the tearing performance and the water resistance of the insulating layer are better; however, when the irradiation dose of the primary irradiation crosslinking exceeds 18M, molecules in the polyolefin pellets start to degrade, resulting in a decrease in the tearing property and the water resistance of the insulating layer. Therefore, the irradiation dose of the primary irradiation crosslinking is preferably 10M-18M; for example, the irradiation dose of the one-time irradiation crosslinking is preferably 10M; for example, the irradiation dose of the one-time irradiation crosslinking is preferably 14M; for example, the irradiation dose for the one-time irradiation crosslinking is preferably 18M.
In one embodiment, the equipment used for the primary irradiation crosslinking is an electron accelerator, a high-energy electron beam generated by the electron accelerator is used for bombarding the insulating layer, so that molecules in the insulating layer are subjected to crosslinking curing reaction, a linear structure is converted into a net structure, the electron accelerator is reflected by four-side titanium foil in the primary irradiation process, the insulating layer is fully crosslinked, and the tensile property of the insulating layer is improved, so that the tearing property and the water resistance of the high-voltage cable are improved.
In a second embodiment, referring to fig. 2 and 4, a method for manufacturing a high voltage cable includes the following steps:
s110, bundling a plurality of conductor monofilaments to obtain a bundled conductor; and twisting the bundle wire conductor to obtain a second conductor layer 210.
It can be understood that the second conductor layer is used as a component of the high voltage cable for performing current or electromagnetic transmission function, and the cross-sectional area of the second conductor layer should be increased in order to make the high voltage cable operate at high speed, however, the conductor monofilament with large cross-sectional area is poor in flexibility and inconvenient to bend, and thus is not favorable for production, transportation, installation and laying. Therefore, the annealed thin conductor monofilaments are bundled and twisted and then used as the second conductor layer, so that the conductor monofilaments are softer and can bear larger external bending stress.
S120, mixing the polyolefin composition to obtain a polyolefin melt; and granulating the polyolefin melt to obtain polyolefin granules.
S130, extruding the polyolefin pellets outside the second conductor layer 210 to form an insulation layer 220, and performing primary irradiation crosslinking on the insulation layer 220.
In an embodiment, the extruding the polyolefin pellets outside the second conductor layer 210 to form the insulating layer 220, and performing a first irradiation crosslinking on the insulating layer 220 specifically includes extruding the polyolefin pellets outside the second conductor layer 210 to form a plurality of polyolefin wires, performing a first irradiation crosslinking on the plurality of polyolefin wires, and twisting the plurality of polyolefin wires to obtain the insulating layer 220. The structure of the high voltage cable thus prepared is shown in fig. 3. For another example, a plurality of polyolefin wires are stranded, and the stranding pitch is reduced to 10-20 times of the diameter of the stranded wire; for another example, a plurality of polyolefin wires are stranded, and the stranding pitch is reduced to 15 times the strand diameter. For another example, a plurality of polyolefin wires are stranded in the same direction for one to three times, and if the primary stranding of the plurality of polyolefin wires is left-hand stranding, the left-hand stranding is still adopted when the secondary or tertiary stranding is carried out; on the contrary, if the first twisting of the plurality of polyolefin wires is right twisting, the right twisting is still adopted during the second or third twisting. The method is characterized in that the polyolefin wire stranding pitch is matched with the strand diameter, the primary stranding pitch is 40-50 times of the strand diameter, the stranding pitch is reduced to 15-20 times of the strand diameter in the secondary stranding, and the stranding pitch is continuously reduced to 9-11 times of the strand diameter in the third stranding. After the stranding machine is stranded for multiple times by dividing roots, the production efficiency is greatly improved, the equipment adopted for stranding is a single-stranded wire stranding machine and a double-stranded wire stranding machine, and the stranding speed is improved by 4-5 times compared with reverse stranding. When the wires are stranded, the gaps among the polyolefin wires are continuously compressed, so that the gaps among the polyolefin wires are smaller, the outer diameter of the polyolefin wires is smaller, and the wire diameter of the polyolefin wires after the opposite stranding is reduced by 8-10% compared with the wire diameter of the polyolefin wires after the opposite stranding. The syntropy transposition makes the polyolefin wire rod have the same stress direction for the stress that the polyolefin wire rod bending was overcome is littleer, and the polyolefin wire rod compliance is then stronger, makes high tension cable have good compliance and bending property, is applicable to the narrow and small environment in laying space such as various new energy automobile insides.
And S140, covering an aluminum foil layer 230 outside the insulating layer 220.
S150, weaving a tin-plated copper braided wire outside the aluminum foil layer 230 to form a braided layer 240.
It will be appreciated that the use of a plurality of tinned copper braided wires to form the braid in a braided manner results in a braid having better bending properties.
S160, extruding the polyolefin pellets out of the woven layer 240 to form a second outer coating layer 250, and performing secondary irradiation crosslinking on the second outer coating layer 250; the second conductor layer 210, the insulation layer 220, the aluminum foil layer 230, the braid 240, and the second outer layer 250 together constitute a high voltage cable 20.
In one embodiment, the irradiation dose of the secondary irradiation crosslinking is 10M-18M. Generally speaking, with the increasing of the irradiation dose of the secondary irradiation crosslinking, the action probability of the radiation and the molecules in the irradiated polyolefin granules in unit time is increased, the density of free radicals required for generating crosslinking is increased, the crosslinking reaction is quicker, the crosslinking degree is higher, and the tearing performance and the water resistance of the outer layer are better; however, when the irradiation dose of the secondary irradiation crosslinking exceeds 18M, molecules in the polyolefin pellets start to degrade, resulting in a decrease in the tear property and water resistance of the outer layer. Therefore, the irradiation dose of the secondary irradiation crosslinking is preferably 10M-18M; for example, the irradiation dose of the secondary irradiation crosslinking is preferably 10M; for example, the irradiation dose of the secondary irradiation crosslinking is preferably 14M; for example, the irradiation dose of the secondary irradiation crosslinking is preferably 18M.
In one embodiment, the equipment used for secondary irradiation crosslinking is an electron accelerator, a high-energy electron beam generated by the electron accelerator is used for bombarding the outer tegument layer, so that molecules in the outer tegument layer are subjected to crosslinking curing reaction and are converted from a linear structure into a net structure, the electron accelerator is reflected by four-side titanium foil in the secondary irradiation process, the outer tegument layer is fully crosslinked, the tensile property of the outer tegument layer is improved, and the tearing property and the water resistance of the high-voltage cable are improved.
Compared with the prior art, the invention has at least the following advantages:
according to the high-voltage cable, the outer layer and the insulating layer of the high-voltage cable are made of propylene-ethylene copolymer, styrene-butadiene-styrene block copolymer, medium-density polyethylene and ethylene-octene copolymer as matrix resin, and triallyl isocyanurate as a photoinitiator, and the matrix resin, the triallyl isocyanurate and the ethylene-octene copolymer are initiated to be mutually cross-linked and cured to form a resin net structure under the irradiation of electron beams, so that the whole system has excellent tear resistance and hydrolysis resistance; the tearing resistance of the whole system is improved through the synergistic effect of the hydrogenated polyolefin resin and the matrix resin; then forming a bonding film on the surface of the resin net structure by N, N' -bis (2, 6-diisopropylphenyl) carbodiimide, and improving the hydrolysis resistance of the whole system; the high-voltage cable can adapt to a severe and complex environment to well protect the conductor layer, and the problem that the conventional high-voltage cable is broken due to long-term stress can be solved; the problem of hydrolysis can take place for a long time to soak in the rainwater in current high tension cable can be solved.
The following are detailed description of the embodiments
Example 1
Bundling a plurality of conductor monofilaments to obtain bundled conductor; and twisting the bundle wire conductor to obtain a conductor layer.
According to the mass parts, 12.5kg of propylene-ethylene copolymer, 10kg of medium density polyethylene, 15kg of ethylene-octene copolymer, 22.5kg of styrene-butadiene-styrene block copolymer, 5kg of hydrogenated polyolefin resin, 4kg of maleic anhydride, 1.5kg of silicone powder, 12.5kg of aluminum hydroxide, 7.5kg of aluminum divinylhypophosphite, 12.5kg of melamine uric acid, 1.5kg of composite antioxidant KY4011.5 kg of copper inhibitor, 1.5kg of polysiloxane elastomer, 2.5kg of silane coupling agent, 0.3kg of light stabilizer, 0.15kg of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 1.25 parts of triallyl isocyanurate are put into an internal mixer for mixing to obtain polyolefin melt; and carrying out single-screw granulation once and double-screw granulation once on the polyolefin melt to obtain polyolefin granules. Wherein the mixing temperature is 160 ℃, and the mixing time is 38 min; the temperature of the single-screw granulation is 145 ℃, and the temperature of the double-screw granulation is 145 ℃.
Extruding the polyolefin granules out of the conductor layer to form an insulating layer, and carrying out primary irradiation crosslinking on the insulating layer; wherein the irradiation dose of the one-time irradiation crosslinking is 14M. The conductor layer and the insulating layer jointly form a high-voltage cable.
Example 2
Bundling a plurality of conductor monofilaments to obtain bundled conductor; and twisting the bundle wire conductor to obtain a conductor layer.
According to the mass parts, 5kg of propylene-ethylene copolymer, 5kg of medium density polyethylene, 25kg of ethylene-octene copolymer, 25kg of styrene-butadiene-styrene block copolymer, 8kg of spherical multi-branched hydrogenated polyolefin resin, 5kg of EBA grafted maleic anhydride, 2kg of silicone powder, 15kg of aluminum hydroxide, 5kg of aluminum divinylhypophosphite, 10kg of melamine uric acid, KY 4012 kg of composite antioxidant, 0.4kg of copper inhibitor, 2kg of polysiloxane elastomer, 3kg of silane coupling agent, 0.4kg of light stabilizer, 0.2kg of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 2 parts of triallyl isocyanurate are put into an internal mixer for mixing to obtain polyolefin melt; and carrying out single-screw granulation once and double-screw granulation once on the polyolefin melt to obtain polyolefin granules. Wherein the mixing temperature is 120 ℃, and the mixing time is 60 min; the temperature of the single-screw granulation is 130 ℃, and the temperature of the double-screw granulation is 130 ℃.
Extruding the polyolefin granules outside the conductor layer to form an insulating layer, and carrying out primary irradiation crosslinking on the insulating layer. Wherein the irradiation dose of the one-time irradiation crosslinking is 12M.
And an aluminum foil layer is coated outside the insulating layer.
And weaving the tinned copper braided wire outside the aluminum foil layer to form a braided layer.
Extruding the polyolefin granules outside the braided layer to form an outer layer, and carrying out secondary irradiation crosslinking on the outer layer; wherein the irradiation dose of the secondary irradiation crosslinking is 12M. The conductor layer, the insulating layer, the aluminum foil layer, the braid and the outer coating layer jointly form a high-voltage cable.
Example 3
Bundling a plurality of conductor monofilaments to obtain bundled conductor; and twisting the bundle wire conductor to obtain a conductor layer. .
According to the mass parts, 20kg of propylene-ethylene copolymer, 15kg of medium density polyethylene, 5kg of ethylene-octene copolymer, 20kg of styrene-butadiene-styrene block copolymer, 5kg of spherical multi-branched hydrogenated polyolefin resin, 3kg of EBA grafted maleic anhydride, 1kg of silicone powder, 10kg of aluminum hydroxide, 10kg of aluminum divinylhypophosphite, 15kg of melamine uric acid, KY 4011 kg of composite antioxidant, 0.2kg of copper inhibitor, 1kg of polysiloxane elastomer, 2kg of silane coupling agent, 0.2kg of light stabilizer, 0.1kg of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 0.5 part of triallyl isocyanurate are put into an internal mixer for mixing to obtain polyolefin melt; and carrying out single-screw granulation once and double-screw granulation once on the polyolefin melt to obtain polyolefin granules. Wherein the mixing temperature is 200 ℃, and the mixing time is 15 min; the temperature of the single-screw granulation is 140 ℃, and the temperature of the double-screw granulation is 150 ℃.
Extruding the polyolefin granules outside the conductor layer to form an insulating layer, and carrying out primary irradiation crosslinking on the insulating layer. Wherein the irradiation dose of the one-time irradiation crosslinking is 18M.
And an aluminum foil layer is coated outside the insulating layer.
And weaving the tinned copper braided wire outside the aluminum foil layer to form a braided layer.
Extruding the polyolefin granules outside the braided layer to form an outer layer, and carrying out secondary irradiation crosslinking on the outer layer; wherein the irradiation dose of the secondary irradiation crosslinking is 18M. The conductor layer, the insulating layer, the aluminum foil layer, the braid and the outer coating layer jointly form a high-voltage cable.
Example 4
Bundling a plurality of conductor monofilaments to obtain bundled conductor; and twisting the bundle wire conductor to obtain a conductor layer.
Taking 15kg of propylene-ethylene copolymer, 10kg of medium density polyethylene, 10kg of ethylene-octene copolymer, 20kg of styrene-butadiene-styrene block copolymer, 5kg of spherical multi-branched hydrogenated polyolefin resin, 3kg of EBA grafted maleic anhydride, 1kg of silicone powder, 10kg of aluminum hydroxide, 8kg of aluminum divinylhypophosphite, 12kg of melamine uric acid, KY 4011 kg of composite antioxidant, 0.2kg of copper inhibitor, 1kg of polysiloxane elastomer, 2kg of silane coupling agent, 0.2kg of light stabilizer, 0.1kg of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 0.5kg of triallyl isocyanurate in parts by weight, and putting the materials into an internal mixer for mixing to obtain polyolefin melt; and carrying out single-screw granulation once and double-screw granulation once on the polyolefin melt to obtain polyolefin granules. Wherein the mixing temperature is 130 ℃, and the mixing time is 15 min; the temperature of the single-screw granulation is 130 ℃, and the temperature of the double-screw granulation is 140 ℃.
Extruding the polyolefin granules outside the conductor layer to form an insulating layer, and carrying out primary irradiation crosslinking on the insulating layer. Wherein the irradiation dose of the one-time irradiation crosslinking is 10M.
And an aluminum foil layer is coated outside the insulating layer.
And weaving the tinned copper braided wire outside the aluminum foil layer to form a braided layer.
Extruding the polyolefin granules outside the braided layer to form an outer layer, and carrying out secondary irradiation crosslinking on the outer layer; wherein the irradiation dose of the secondary irradiation crosslinking is 10M. The conductor layer, the insulating layer, the aluminum foil layer, the braid and the outer coating layer jointly form a high-voltage cable.
Example 5
Essentially the same procedure as in example 4, except that: the irradiation dose of the first irradiation crosslinking is changed to 16M, and the irradiation dose of the second irradiation crosslinking is also changed to 16M.
Example 6
Essentially the same procedure as in example 4, except that: the irradiation dose of the first irradiation crosslinking is changed to 14M, and the irradiation dose of the second irradiation crosslinking is also changed to 16M.
Example 7
Essentially the same procedure as in example 6, except that: the mass of the propylene-ethylene copolymer was changed to 5kg, and the mass of the ethylene-octene copolymer was changed to 20 kg.
Example 8
Essentially the same procedure as in example 5, except that: the mass of the spherical multi-branched hydrogenated polyolefin resin was changed to 2 kg.
Comparative example 1
A common cross-linked polyolefin in-vehicle high-voltage cable is sold in the market.
Comparative example 2
Essentially the same procedure as in example 4, except that: the irradiation dose of the first irradiation crosslinking is changed into 20M, and the irradiation dose of the second irradiation crosslinking is also changed into 20M.
Comparative example 3
Essentially the same procedure as in example 5, except that: 0.1kg of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide was absent from the raw material of the polyolefin composition.
Comparative example 4
Essentially the same procedure as in example 5, except that: the raw materials of the polyolefin composition comprise the following components by mass: 20kg of ethylene-octene copolymer, 25kg of ethylene-vinyl acetate copolymer, 10kg of ethylene propylene diene monomer, 5kg of POE grafted maleic anhydride, 1kg of methyl vinyl silicone rubber, 1kg of aluminum hydroxide, 8kg of aluminum divinyl hypophosphite, 12kg of melamine uric acid, 10101 kg of antioxidant, 0.5kg of antioxidant TH-412S, 0.2kg of copper inhibitor, 1kg of silicone powder, 2kg of silane coupling agent, 0.2kg of light stabilizer, 0.1kg of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 0.5kg of triallyl isocyanurate.
Experiment: testing the high-voltage cables of the examples 1 to 8 and the comparative examples 1 to 4 under the same test conditions to obtain relevant parameters, wherein the water resistance test is to place a test sample in hot water at 80 ℃ for 7 days; the test results show that the tensile strength, elongation at break, pant-type tear strength, tensile retention after water resistance, and elongation retention after water resistance are all higher for the inventive examples than for comparative example 1. In order to save space and reasonably display the comparison effect, only the data of examples 4-8 and comparative examples 1-4 are selected for tabulation, and the details are shown in tables 1 and 2. The effects of the other embodiments are similar to those of embodiments 4 to 8, and are not described again.
Table 1 hardness test results of high voltage cable
Figure BDA0002438664030000151
As can be seen from the comparison between examples 6 and 7, the hardness of the high voltage cable of example 6 is much lower as the amount of the propylene-ethylene copolymer is increased and the amount of the ethylene-octene copolymer is decreased, mainly because the hardness of the propylene-ethylene copolymer is much lower than that of the ethylene-octene copolymer.
Table 2 performance test results of high voltage cable
Figure BDA0002438664030000152
As can be seen by comparing examples 4 to 8 with comparative example 1, the tensile strength, elongation at break, pant-type tear strength, tensile retention after water resistance, and elongation retention after water resistance of the examples of the present invention are all higher than those of comparative example 1, and the bending stress is smaller.
It can be seen from comparison between example 4 and example 5 that, with the increase of the irradiation dose, the tensile strength, the elongation at break, the pant-type tear strength, the tensile retention rate after water resistance, and the retention rate after water resistance all increase, mainly because the irradiation dose increases, the reaction probability of the radiation and the irradiated polyolefin material molecules increases in unit time, the density of the radicals required for crosslinking increases, the crosslinking reaction occurs faster, the crosslinking degree is higher, more matrix resin is changed from a chain structure to a net structure, the molecules are arranged more tightly, so that water molecules are difficult to enter the material system, and other molecules in the net structure locking system prevent the molecules from dissociating, so that the tear resistance and the hydrolysis resistance of the high-voltage cable are better. However, compared with example 4, the irradiation dose of comparative example 2 is too large, so that molecules in the system are degraded, the elongation at break and the pant-type tear strength of the high-voltage cable are reduced, and the tear resistance of the high-voltage cable is greatly reduced. It can be seen from comparison of examples 4 to 6 that the tensile strength, the elongation at break, the pant-type tear strength, the tensile retention rate after water resistance, and the elongation retention rate after water resistance of example 6 are all the best, and the bending stress is smaller, mainly because the irradiation dose of example 6 is the best, the tear resistance and the hydrolysis resistance of the high-voltage cable can be the best, and the high-voltage cable has the better bending performance.
As can be seen by comparing example 6 with example 7, when the amount of the ethylene-octene copolymer is decreased and the amount of the propylene-ethylene copolymer is increased, the tensile strength, elongation at break, pant-type tear strength, tensile retention after water resistance, and elongation retention after water resistance of the high-voltage cable of example 7 are all better, i.e., the tear resistance and hydrolysis resistance of the high-voltage cable are better, and the bending stress is smaller, mainly because the propylene-ethylene copolymer is easier to crosslink than the ethylene-octene copolymer, and the propylene-ethylene copolymer has stronger toughness than the ethylene-octene copolymer.
It can be seen from comparison between example 5 and example 8 that the content of the spherical multi-branched hydrogenated polyolefin resin in example 5 is higher, so that the tensile strength, elongation at break and pants-type tear strength of the high voltage cable are higher, and the bending stress is smaller, because the molecular shape of the spherical multi-branched hydrogenated polyolefin resin is a multi-branched spherical macromolecule, other molecules in the system can form hydrogen bonds with the multi-branched spherical macromolecule, and the ethylene-octene copolymer molecules can be interpenetrated and wound on the macromolecular branched chain, so that the molecular sliding in the system can be reduced, and the tear resistance of the whole system can be improved. Macroscopically, the spherical multi-branched hydrogenated polyolefin resin can improve the viscosity of the whole system, increase the fluidity of a molten liquid, reduce the glass transition temperature, increase the molecular adhesion, reduce the brittle fracture coefficient of a plasticized charge surface, improve the compatibility of a flame retardant and matrix resin and improve the tear strength of the high-voltage cable of the embodiment 5.
As can be seen by comparing example 5 with comparative example 3, compared with comparative example 3 in which N, N ' -bis (2, 6-diisopropylphenyl) carbodiimide is not added, the tensile retention rate after water resistance and the elongation retention rate after water resistance of example 5 are both higher, which proves that the addition of N, N ' -bis (2, 6-diisopropylphenyl) carbodiimide in the system can greatly improve the hydrolysis resistance of the system, and example 5 can perform an addition reaction with hydrogen-bond-containing molecules in the matrix resin by adding N, N ' -bis (2, 6-diisopropylphenyl) carbodiimide, so that a bonding film is formed on the surface of the resin network structure, water molecules are prevented from entering and damaging the resin network structure, the hydrolysis resistance of the whole system is improved, and the hydrolysis resistance of the high-voltage cable of example 5 is better.
As can be seen by comparing example 5 with comparative example 4, example 5 and comparative example 4 both added the same amount of N, N ' -bis (2, 6-diisopropylphenyl) carbodiimide, but the reaction between other molecules in the whole system of example 5 and N, N ' -bis (2, 6-diisopropylphenyl) carbodiimide was better, the synergistic effect was better, N ' -bis (2, 6-diisopropylphenyl) carbodiimide could exert better hydrolysis resistance, and the tensile strength, elongation at break, pant-tear strength, tensile retention after water resistance, and elongation retention after water resistance of example 5 were all higher by the interaction between the components.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A high-voltage cable is characterized by comprising a first conductor layer and a first outer tegument layer coated outside the first conductor layer;
the material of the first outer layer is a polyolefin composition, and the polyolefin composition comprises the following components in parts by mass: 5-20 parts of propylene ethylene copolymer, 5-15 parts of medium density polyethylene, 5-25 parts of ethylene-octene copolymer, 20-25 parts of styrene-butadiene-styrene block copolymer, 2-8 parts of hydrogenated polyolefin resin, 3-5 parts of maleic anhydride, 1-2 parts of silicone powder, 10-15 parts of aluminum hydroxide, 5-10 parts of divinyl aluminum hypophosphite, 10-15 parts of melamine uric acid, 1-2 parts of antioxidant, 0.2-0.4 part of copper inhibitor, 1-2 parts of polysiloxane elastomer, 2-3 parts of silane coupling agent, 0.2-0.4 part of light stabilizer, 0.1-0.2 part of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide and 0.5-2 parts of triallyl isocyanurate.
2. A high-voltage cable is characterized by comprising a second conductor layer, an insulating layer, an aluminum foil layer, a weaving layer and a second outer tegument layer, wherein the insulating layer is arranged outside the second conductor layer;
wherein the material of the insulating layer and the second outer layer is the polyolefin composition of claim 1.
3. A preparation method of a high-voltage cable is characterized by comprising the following steps:
compounding the polyolefin composition of claim 1 to obtain a polyolefin melt; granulating the polyolefin melt to obtain polyolefin granules;
extruding the polyolefin granules outside a first conductor layer to form a first outer covering layer, and carrying out primary irradiation crosslinking on the first outer covering layer; the first conductor layer and the first outer layer jointly form a high-voltage cable.
4. The method for preparing a high voltage cable according to claim 3, wherein before the operation of extruding the polyolefin pellets outside the first conductor layer to form the first outer layer, a plurality of conductor monofilaments are further subjected to stranding to obtain a stranded conductor; and twisting the bundle wire conductor to obtain the first conductor layer.
5. The method for preparing a high-voltage cable according to claim 3, wherein the mixing temperature is 120 ℃ to 200 ℃, and the mixing time is 15min to 60 min.
6. The method for preparing a high voltage cable according to claim 3, wherein the temperature of the granulation is 130 ℃ to 160 ℃.
7. The method for preparing a high voltage cable according to claim 3, wherein the irradiation dose of the single irradiation crosslinking is 10M to 18M.
8. A preparation method of a high-voltage cable is characterized by comprising the following steps:
compounding the polyolefin composition of claim 1 to obtain a polyolefin melt; granulating the polyolefin melt to obtain polyolefin granules;
extruding the polyolefin granules outside a second conductor layer to form an insulating layer, and carrying out primary irradiation crosslinking on the insulating layer;
coating an aluminum foil layer outside the insulating layer;
weaving tinned copper braided wires outside the aluminum foil layer to form a braided layer;
extruding the polyolefin granules outside the braided layer to form a second outer covering layer, and carrying out secondary irradiation crosslinking on the second outer covering layer; the second conductor layer, the insulating layer, the aluminum foil layer, the braid and the second outer layer together form a high-voltage cable.
9. The method for preparing a high voltage cable according to claim 8, wherein the radiation dose of the secondary radiation crosslinking is 10M to 18M.
10. The method for preparing a high voltage cable according to claim 9, wherein the radiation dose of the secondary radiation crosslinking is 12M to 16M.
CN202010259247.0A 2020-04-03 2020-04-03 High-voltage cable and preparation method thereof Withdrawn CN111518359A (en)

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Application publication date: 20200811