WO2023218506A1 - Fil électrique et câble - Google Patents

Fil électrique et câble Download PDF

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Publication number
WO2023218506A1
WO2023218506A1 PCT/JP2022/019677 JP2022019677W WO2023218506A1 WO 2023218506 A1 WO2023218506 A1 WO 2023218506A1 JP 2022019677 W JP2022019677 W JP 2022019677W WO 2023218506 A1 WO2023218506 A1 WO 2023218506A1
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WO
WIPO (PCT)
Prior art keywords
resin
filler
insulating layer
electric wire
conductor
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PCT/JP2022/019677
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English (en)
Japanese (ja)
Inventor
遼太 福本
亮輔 樋熊
太郎 藤田
真一 上原
信也 西川
道夫 内野
Original Assignee
住友電気工業株式会社
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Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Priority to PCT/JP2022/019677 priority Critical patent/WO2023218506A1/fr
Publication of WO2023218506A1 publication Critical patent/WO2023218506A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • 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
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • 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
    • H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
    • H01B3/22—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils hydrocarbons
    • 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
    • H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction

Definitions

  • the present disclosure relates to electric wires and cables.
  • Conventional cables generally include a core material (core wire) made by twisting a plurality of insulated wires (core wires) and an outer covering layer that covers the core material (see Patent Document 1).
  • the electric wire of the present disclosure includes a conductor made of a single wire or a conductor made of a plurality of wires twisted together, and an insulating layer covering the outer periphery of the conductor, and the insulating layer includes a resin component, a first filler, and a second filler.
  • the resin component contains a filler
  • the resin component includes an olefin resin and a resin incompatible with the olefin resin, and the olefin resin and the resin incompatible with the olefin resin form a sea-island structure
  • the first filler is made of graphite
  • the second filler is made of a metal oxide, a metal hydroxide, or a combination thereof
  • the mass ratio of the first filler to the resin component is 10/100 or more and 80/100 or less.
  • the thermal conductivity of the insulating layer at 25° C. is 0.5 W/m ⁇ K or more, and the volume resistivity is 1 ⁇ 10 13 ⁇ cm or more.
  • FIG. 1 is a schematic cross-sectional view showing an electric wire according to one embodiment.
  • FIG. 2 is a schematic cross-sectional view showing a cable according to one embodiment.
  • FIG. 3 is a schematic cross-sectional view showing a cable according to another embodiment.
  • the present disclosure has been made based on the above circumstances, and aims to provide an electric wire including an insulating layer that has excellent heat dissipation properties, high insulation properties, mechanical strength, and high oil resistance.
  • An electric wire includes a conductor made of a single wire or a conductor made of a plurality of strands twisted together, and an insulating layer covering the outer periphery of the conductor, wherein the insulating layer includes a resin component, a first a filler and a second filler, the resin component includes an olefin resin and a resin incompatible with the olefin resin, and the olefin resin and the resin incompatible with the olefin resin have a sea-island structure.
  • the first filler is made of graphite
  • the second filler is made of a metal oxide, a metal hydroxide, or a combination thereof
  • the mass ratio of the first filler to the resin component is 10/100 or more and 80 /100 or less
  • the thermal conductivity of the insulating layer at 25° C. is 0.5 W/m ⁇ K or more
  • the volume resistivity is 1 ⁇ 10 13 ⁇ cm or more.
  • the inventors of the present invention have focused on the fact that the heat dissipation of the conductor, which has increased in temperature, cannot be dissipated due to the low heat dissipation properties of the coating materials used in conventional electric wires. Therefore, the present invention was completed after intensive study on suppressing the rise in temperature of the conductor by improving the thermal conductivity of the above-mentioned coating material.
  • the insulating layer of the electric wire has excellent tensile strength and oil resistance because it contains an olefin resin containing a large amount of crystalline components as the resin component.
  • the insulating layer contains the first filler made of graphite and the second filler made of a metal oxide, a metal hydroxide, or a combination thereof, and the mass ratio of the first filler to the resin component is 10/100 or more and 80/100 or less, and the thermal conductivity of the insulating layer at 25°C is 0.5 W/m ⁇ K or more, and has high thermal conductivity, so the heat of the conductor is not released to the outside. , highly effective in suppressing the temperature rise of the conductor. Further, by having a volume resistivity of 1 ⁇ 10 13 ⁇ cm or more, the insulation properties of the insulating layer can be improved.
  • the resin component includes an olefin resin and a resin incompatible with the olefin resin, and these form a sea-island structure
  • the first filler which is difficult to disperse in the olefin resin, can be mixed with the non-compatible resin. Since the molten metal can be unevenly distributed on the resin side, the heat dissipation properties of the insulating layer can be further improved. Therefore, in the electric wire, since the insulating layer has excellent heat dissipation properties, it is possible to suppress the rise in temperature of the conductor and reduce power loss, and also has high insulation properties, mechanical strength, and high oil resistance.
  • volume specific resistance means an electrical resistance value measured by a double ring electrode method based on JIS-K6271:2008.
  • the above-mentioned "resin incompatible with olefin resin” refers to a resin that is incompatible with olefin resin. For example, using a transmission electron microscope (TEM), it is possible to detect This can be confirmed by observing a cross section. When a cross section of a resin that is incompatible with an olefin resin is observed using an electron microscope, a sea-island structure is observed.
  • TEM transmission electron microscope
  • the mass ratio of the second filler to the resin component is 30/100 or more and 200/100 or less.
  • the mass ratio of the second filler to the resin component is 30/100 or more and 200/100 or less.
  • the average particle diameter ratio of the first filler to the second filler is 1.1 times or more.
  • the heat dissipation properties of the insulating layer of the electric wire can be further improved.
  • the above-mentioned "average particle diameter” means the median diameter (D50), which is the value at which the volume-based integrated distribution calculated in accordance with JIS-Z-8819-2:2001 is 50%.
  • the median diameter (D50) can be a value measured by the following method. The measurement is performed using a laser diffraction particle size distribution measuring device. A scattering measurement mode is adopted, and a laser beam is irradiated to a wet cell in which a dispersion liquid in which particles of the measurement target sample are dispersed in a dispersion solvent circulates, thereby obtaining the scattered light distribution from the measurement sample. Then, the scattered light distribution is approximated by a log-normal distribution, and the particle diameter corresponding to a cumulative degree of 50% (D50) is defined as the median diameter.
  • the incompatible resin is a styrene copolymer
  • the olefin resin is polypropylene
  • the mass ratio of the styrene copolymer to the polypropylene is 20/80 or more and 80/20 or less.
  • the olefin resin is polypropylene
  • the tensile strength and oil resistance of the insulating layer of the electric wire can be further improved.
  • the incompatible resin is a styrene-based copolymer, the tensile elongation of the insulating layer of the electric wire can be improved, and the dispersibility of the first filler is increased, so that heat dissipation can be improved.
  • the mass ratio of the styrene copolymer to the polypropylene is 20/80 or more and 80/20 or less, the tensile properties, heat dissipation properties, and oil resistance of the insulating layer of the electric wire can be further improved.
  • the polypropylene is random polypropylene or block polypropylene.
  • the polypropylene is random polypropylene or block polypropylene, the tensile strength and oil resistance of the insulating layer can be further improved.
  • the content of structural units derived from styrene in the styrenic copolymer is 5% by mass or more and 40% by mass or less.
  • the content of structural units derived from styrene in the styrene-based copolymer is 5% by mass or more and 40% by mass or less, the tensile elongation and oil resistance of the insulating layer can be further improved.
  • a cable according to another aspect of the present disclosure includes the one or more electric wires and a jacket layer disposed around the one or more electric wires. Since the cable includes the above-mentioned electric wire as a core electric wire constituting the core wire, it has excellent heat dissipation, as well as high insulation, mechanical strength, and high oil resistance.
  • the electric wire includes a conductor made of a single wire or a conductor made of a plurality of wires twisted together, and an insulating layer covering the outer periphery of the conductor.
  • FIG. 1 shows an electric wire according to an embodiment of the present disclosure.
  • the electric wire 1 in FIG. 1 includes a conductor 2 in the form of a single wire or a conductor wire made of a plurality of wires twisted together, and an insulating layer 3 covering the outer peripheral surface of the conductor 2.
  • an additional layer such as a primer treatment layer may be provided between the conductor and the insulating layer.
  • the conductor 2 is a metal linear body responsible for electrical conduction of the electric wire 1.
  • Examples of the conductor 2 include a round wire with a circular cross section, a square wire with a rounded square cross section, and a flat wire with a rounded rectangular cross section.
  • the conductor 2 may be a single linear body as shown in FIGS. 1 and 2, or may be a twisted wire body made of a plurality of thin wires twisted together.
  • the conductor 2 for example, metals such as copper, aluminum, nickel, silver, and iron, or alloys thereof are used, but copper or aluminum is preferably used from the viewpoint of conductivity and workability. Further, the conductor 2 may have a multilayer structure in which another metal coating is laminated on the outer peripheral surface of a metal linear body.
  • the lower limit of the average cross-sectional area (including gaps between wires) in the cross section of the conductor 2 is preferably 2 mm 2 , more preferably 8 mm 2 , and even more preferably 14 mm 2 .
  • the upper limit of the average cross-sectional area of the conductor 2 is preferably 600 mm 2 , more preferably 500 mm 2 , and even more preferably 400 mm 2 . If the average cross-sectional area of the conductor 2 is less than the above lower limit, there is a possibility that a sufficient current cannot flow. Moreover, if the average cross-sectional area of the conductor 2 exceeds the above upper limit, there is a possibility that sufficient bending resistance cannot be obtained.
  • the "average cross-sectional area" refers to the average value of values measured at ten arbitrary cross-section points.
  • the insulating layer 3 contains a resin component, a first filler, and a second filler.
  • the average thickness of the insulating layer 3 is not particularly limited, but the lower limit of the average thickness is, for example, preferably 0.8 mm, and more preferably 1.0 mm.
  • the upper limit of the average thickness of the insulating layer 4 is preferably 10 mm, more preferably 7 mm. If the average thickness of the insulating layer 4 is less than the above lower limit, the insulating property of the insulating layer 4 may be insufficient. Furthermore, if the average thickness of the insulating layer 4 exceeds the above upper limit, flexibility may be impaired.
  • the "average thickness” herein refers to the average value of thicknesses measured at arbitrary ten points. Note that in the following description, the term "average thickness" for other members etc. will also be defined in the same manner.
  • the resin component contains an olefin resin and a resin that is incompatible with the olefin resin. Further, the olefin resin and the resin incompatible with the olefin resin form a sea-island structure.
  • the resin component includes an olefin resin and a resin incompatible with the olefin resin, and these form a sea-island structure, so that the first filler, which is difficult to disperse in the olefin resin, is transferred to the incompatible resin. Since it can be unevenly distributed toward the resin side, the heat dissipation properties of the insulating layer 3 can be further improved.
  • the insulating layer 3 contains an olefin resin as a resin component, it has excellent tensile strength and oil resistance.
  • the olefin resin include polyethylene (PE) and polypropylene (PP).
  • polyethylene examples include high density polyethylene (PE), very low density polyethylene (VLDPE), low density polyethylene, linear low density polyethylene (LLDPE), ethylene- ⁇ olefin copolymer, unsaturated carboxylic acid or derivatives thereof.
  • PE high density polyethylene
  • VLDPE very low density polyethylene
  • LLDPE linear low density polyethylene
  • ethylene- ⁇ olefin copolymer unsaturated carboxylic acid or derivatives thereof.
  • examples include modified acid-modified polyethylene.
  • ethylene- ⁇ olefin copolymers include ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), and ethylene-vinyl acetate copolymer (EVA).
  • EBA butyl acrylate copolymer
  • EBA ethylene-methyl methacrylate copolymer
  • ethylene-acrylic acid copolymer and
  • polypropylene examples include homopolypropylene, random polypropylene, block polypropylene, acid-modified polypropylene modified with an unsaturated carboxylic acid or a derivative thereof, and the like.
  • random polypropylene examples include propylene- ⁇ -olefin copolymers, which are copolymers of propylene and ethylene or ⁇ -olefins having 4 to 20 carbon atoms.
  • Block polypropylene is a resin consisting of homopolypropylene as a main component, a random copolymer elastomer as a copolymer component, and an ethylene polymer as an optional component.
  • Examples of the unsaturated carboxylic acid in the acid used for the acid modification include acrylic acid, methacrylic acid, maleic acid, itaconic acid, fumaric acid, and the like.
  • Examples of unsaturated carboxylic acid derivatives include maleic acid monoester, maleic anhydride, itaconic acid monoester, itaconic anhydride, fumaric acid monoester, and fumaric anhydride. Among these, unsaturated carboxylic acid derivatives are preferred, and maleic anhydride is more preferred.
  • propylene- ⁇ olefin copolymer examples include ethylene-propylene copolymer, propylene-acrylic acid copolymer, propylene-methacrylic acid copolymer, propylene-acrylate ester copolymer, propylene-methacrylate ester copolymer, etc. can be mentioned.
  • polypropylene is preferred, and random polypropylene or block polypropylene is more preferred.
  • the olefin resin is random polypropylene or block polypropylene, tensile strength and oil resistance can be improved while suppressing a significant decrease in tensile elongation.
  • the resin component includes a resin that is incompatible with the olefin resin
  • the first filler that is difficult to disperse in the olefin resin can be unevenly distributed on the side of the resin that is incompatible with the olefin resin.
  • the heat dissipation of the layer can be further improved.
  • resins that are incompatible with olefin resins include styrene copolymers, polyvinyl chloride resins, polyurethanes, fluororesins, fluororubbers, and silicones. Among these, a styrene copolymer is more preferable because the first filler has good dispersibility and can improve the tensile elongation of the insulating layer.
  • One or more types of incompatible resins may be included.
  • styrenic copolymer examples include styrene/ethylene block copolymer (SE), styrene/ethylene/butylene/ethylene block copolymer (SEBC) or its hydrogenated product, and styrene/ethylene/butylene/styrene block copolymer.
  • SEBS styrene/ethylene/propylene/styrene block copolymer
  • SEEPS styrene/ethylene/ethylene/propylene/styrene block copolymer
  • SEEPS hydrogenated styrene-butadiene rubber
  • the lower limit of the content of structural units derived from styrene in the styrene-based copolymer is preferably 5% by mass, more preferably 8% by mass.
  • the upper limit of the content of the structural unit derived from styrene is preferably 40% by mass, more preferably 38% by mass.
  • the lower limit of the mass ratio of the styrene copolymer to the polypropylene is preferably 20/80, and 30/80. 70 is more preferred.
  • the upper limit of the mass ratio of the styrene copolymer to the polypropylene is preferably 80/20 or less, more preferably 70/30.
  • the insulating layer 3 may contain other resins other than the above olefin resin and a resin that is incompatible with the above olefin resin.
  • the other resins include polyvinyl chloride resin, polyurethane, fluororesin, fluororubber, silicone, and polyester resin.
  • the first filler consists of graphite.
  • the electrical conductivity of the insulating layer can be increased and heat dissipation can be improved.
  • the lower limit of the mass ratio of the first filler to the resin component is 10/100, preferably 20/100, and more preferably 25/100.
  • the upper limit of the mass ratio of the first filler to the resin component is 80/100, preferably 75/100, and more preferably 70/100.
  • the lower limit of the average particle size of the graphite is preferably 0.5 ⁇ m, more preferably 1 ⁇ m, and even more preferably 5 ⁇ m.
  • the upper limit of this average particle diameter is preferably 100 ⁇ m, more preferably 50 ⁇ m, and even more preferably 30 ⁇ m.
  • the average particle size of graphite is less than 0.5 ⁇ m, the thermal conductivity at 25° C. may decrease.
  • the average particle size of graphite exceeds 100 ⁇ m, the tensile elongation may decrease.
  • heat dissipation can be further improved.
  • the insulating layer 3 contains a second filler made of a metal oxide, a metal hydroxide, or a combination thereof.
  • the heat dissipation properties and insulation properties of the insulating layer can be improved.
  • metal oxides examples include magnesium oxide, zinc oxide, aluminum oxide, titanium oxide, calcium oxide, and the like.
  • metal hydroxides examples include magnesium hydroxide, aluminum hydroxide, calcium hydroxide, and the like.
  • the lower limit of the mass ratio of the second filler to the resin component is preferably 30/100, more preferably 50/100.
  • the upper limit of the mass ratio of the second filler to the resin component is preferably 200/100, more preferably 180/100.
  • both insulation properties and tensile elongation can be achieved well.
  • the lower limit of the average particle diameter ratio of the first filler to the second filler is preferably 1.1 times, more preferably 5 times.
  • the upper limit of the average particle size ratio of the first filler to the second filler is not particularly limited, but may be, for example, 100 times or less, from the viewpoint that tensile elongation decreases if the graphite particle size is too large.
  • the insulating layer 3 may contain other additives as necessary.
  • additives include flame retardants, flame retardant aids, antioxidants, lubricants, colorants, reflection agents, masking agents, processing stabilizers, and plasticizers.
  • the lower limit of the thermal conductivity of the insulating layer 3 at 25° C. is 0.5 W/m ⁇ K, preferably 0.6 W/m ⁇ K, and more preferably 0.7 W/m ⁇ K.
  • the lower limit of the volume resistivity of the insulating layer 3 is 1 ⁇ 10 13 ⁇ cm, preferably 1 ⁇ 10 14 ⁇ cm, and more preferably 1 ⁇ 10 15 ⁇ cm.
  • the method for manufacturing the electric wire is not particularly limited, but includes, for example, the following steps. (1) Step of preparing a resin composition for forming an insulating layer (hereinafter also referred to as a resin composition) for forming an insulating layer (resin composition preparation step) (2) Step of coating a conductor with a resin composition for forming an insulating layer (resin composition coating step)
  • Resin composition preparation step In the resin composition preparation step, the resin components of the resin composition for forming an insulating layer, the first filler, the second filler, and other additives as necessary are mixed using a melt mixer or the like. By this, an insulating layer forming resin composition for forming an insulating layer is prepared.
  • the melt mixer known ones such as open rolls, Banbury mixers, pressure kneaders, single-screw mixers, multi-screw mixers, etc. can be used.
  • the resin composition of the present disclosure may be crosslinked by any one of chemical crosslinking, silane crosslinking, and radiation crosslinking.
  • the resin composition coating step can be carried out by extrusion molding the above resin composition for forming an insulating layer onto the conductor using, for example, a melt extrusion molding machine. Thereby, an extrusion molded product corresponding to the insulating layer is obtained.
  • the dimensions of the extrusion molded product can be designed depending on the application and the like.
  • a cable according to another aspect of the present disclosure includes one or more electric wires and a jacket layer disposed around the one or more electric wires.
  • the outer diameter of the cable is appropriately designed depending on the intended use, but the lower limit of the outer diameter is preferably 10 mm, more preferably 15 mm.
  • the upper limit of the outer diameter of the cable is preferably 80 mm, more preferably 60 mm, and even more preferably 50 mm.
  • FIG. 2 shows a cable according to a first embodiment of the present disclosure.
  • the coaxial cable 5 according to the first embodiment includes an electric wire 1 including a conductor 2 and an insulating layer 3 covering the outer periphery of the conductor 2, and an outer covering layer 4 disposed around the electric wire 1. That is, the coaxial cable 5 has a cross-sectional configuration in which the conductor 2, the insulating layer 3, and the jacket layer 4 are laminated concentrically. Since the cable is the coaxial cable 5, the diameter can be reduced.
  • the electric wire 1, the conductor 2, and the insulating layer 3 are the same as the electric wire 1 in FIG. 1, so the same reference numerals are given and the description thereof will be omitted.
  • the main component of the outer cover layer 4 is not particularly limited as long as it is a synthetic resin with excellent abrasion resistance, and examples thereof include polyvinyl chloride, polyethylene, crosslinked polyethylene, chloroprene, and the like. Further, the outer covering layer 4 may be crosslinked.
  • the outer covering layer 4 may contain the additives exemplified for the insulating layer 3.
  • the average thickness of the outer covering layer 4 is preferably 0.5 mm or more and 3.0 mm or less.
  • FIG. 1 A cable according to a second embodiment of the present disclosure is shown in FIG.
  • the cable 20 according to the second embodiment includes a core wire obtained by twisting two electric wires 1 shown in FIG.
  • the cable is provided with an outer jacket layer 10 disposed on the outer cover layer 10.
  • the core wire is composed of two twisted pairs of electric wires 1 having the same diameter.
  • the cable 20 may have a tape member 8 such as paper wrapped between the outer covering layer 10 and the inner covering layer 7 as a winding restraining member.
  • the cable 20 can be suitably used, for example, as a power supply cable in the information and communication field.
  • the main component of the inner coating layer 7 for example, PP yarn, paper, jute, etc. are used.
  • the lower limit of the outer diameter of the inner coating layer 7 is preferably 9.0 mm, more preferably 10 mm.
  • the upper limit of the outer diameter of the inner coating layer 7 is preferably 75 mm, more preferably 60 mm.
  • the outer covering layer 10 has the same configuration as the outer covering layer 4 in FIG. 2, so a description thereof will be omitted.
  • the cable can be obtained by a manufacturing method including a step of covering one or more electric wires with an outer covering layer (an outer covering layer covering step).
  • an outer covering layer covering step When the cable includes a plurality of electric wires, it may include a step of twisting the plurality of electric wires together.
  • the cable when the cable includes an inner coating layer or a tape member around one or more electric wires, it may include a step of forming the inner coating layer or a step of winding the tape member.
  • Outer coating layer coating process In the outer covering layer coating step, a resin composition for forming an outer covering layer is extruded onto the outside of one or more electric wires formed using, for example, a melt extrusion molding machine. This coats the outside of the one or more electric wires with the outer covering layer.
  • the outer covering layer After coating with the outer covering layer, the outer covering layer is cured by cooling the one or more electric wires, and the cable is obtained. This cable is wound up and collected.
  • the cable manufacturing method may further include a step of crosslinking the resin component of the outer covering layer (crosslinking step).
  • This crosslinking step may be performed before coating the outside of one or more electric wires with the composition forming the outer coating layer, or may be performed after coating (after formation of the outer coating layer).
  • the cable includes the above-mentioned electric wire as the core electric wire constituting the core wire, it has excellent heat dissipation, as well as high insulation, mechanical strength, and high oil resistance.
  • No. 1 consisting of a single layer was prepared by the following procedure. 1 ⁇ No. 31 insulating layers were formed.
  • [Resin component] Olefin Resin
  • the following polypropylene was used as the olefin resin in the resin component.
  • the above melt flow rate (MFR) was measured using a melt indexer at a measurement temperature of 230°C and a weight of 2.16kg, according to a method based on JIS-K7210-1:2014 (method A: mass measurement method). It is the value to be measured. Further, the bending elastic modulus is a value measured by a method based on JIS-K7171:2016. 2.
  • Styrene Copolymer The following styrene copolymer was used as a resin incompatible with the olefin resin in the resin component.
  • SEBS Styrene/ethylene/butylene/styrene block copolymer
  • SEBS content of styrene structural unit 18% by mass
  • Shore A hardness 67 SEBS (content of styrene structural unit 35% by mass) Shore A hardness 49
  • SEBS content of styrene structural unit 43% by mass
  • Shore A hardness 96 Hydrogenated styrene butadiene rubber (HSBR) (styrene structural unit content 10% by mass) Shore A hardness 42
  • HSBR Hydrogenated styrene butadiene rubber
  • [Second filler] The following five types of fillers were used as the second filler. (1) Magnesium hydroxide (average particle size 0.8 ⁇ m) (2) Aluminum hydroxide (average particle size 1.5 ⁇ m) (3) Aluminum hydroxide (average particle size 10.0 ⁇ m) (4) Type 1 zinc oxide (average particle size 0.75 ⁇ m) (5) Magnesium oxide (average particle size 4.5 ⁇ m)
  • a resin composition for forming an insulating layer was prepared using the above resin component, first filler, and second filler.
  • the composition and content of the insulating layer are shown in Tables 1 to 3. "-" indicates that the corresponding component was not used.
  • An insulating layer was manufactured by extrusion molding using the above resin composition for forming an insulating layer.
  • An extrusion molding die was used for extrusion molding. Extrusion molding was performed at a die temperature of 180° C. and a linear speed of 5 m/min, using a No. 1 ⁇ No. 31 insulating layers were obtained.
  • An electric wire was produced by covering the outer periphery of a conductor having a cross-sectional area of 14 mm 2 (14SQ) with the above insulating layer.
  • Insulating layer no. 1 ⁇ No. Regarding 31 thermal conductivity, volume resistivity, tensile strength, tensile elongation, tensile strength and tensile elongation after oil resistance test, conductor temperature when energized, withstand voltage, and the presence or absence of sea-island structure in the cross section of the insulating layer. evaluated.
  • thermo conductivity A press sheet with a size of 150 mm in diameter and 0.5 mm in thickness was prepared as a test sample using a heat press machine from the resin composition for forming an insulating layer, and was heated at 25°C in accordance with ISO-22007-3 (temperature wave method). The thermal conductivity was measured at The larger the value of thermal conductivity [W/(m ⁇ K)], the higher the heat dissipation performance of the insulating layer. When the thermal conductivity at 25° C. is 0.50 [W/(m ⁇ K)] or more, it can be said that the heat dissipation property is excellent.
  • volume specific resistance (insulation) A press sheet with a size of 150 mm in diameter and 1 mm in thickness was prepared as a test sample using a hot press machine from the resin composition for forming an insulating layer, and the electrical resistance was measured using the double ring electrode method specified in JIS-K6271:2008. It was measured. Volume resistivity values were determined from the measured values. The larger the value of the volume resistivity [ ⁇ cm], the higher the insulation properties of the insulating layer. When the volume resistivity is 1 ⁇ 10 13 or more, it can be said that the insulation layer has excellent insulation properties.
  • the tensile strength [MPa] and tensile elongation [%] of each insulating layer were measured in accordance with JIS-K-7162:1994. When the tensile strength is 10 MPa or more and the tensile elongation is 200% or more, it can be said that the mechanical strength of the insulating layer is excellent.
  • the temperature of the conductor during energization was determined by using a No. 14 conductor with an average thickness of 2.5 mm on the outer periphery of a 14SQ conductor with a conductor diameter of 4.4 mm. 1 ⁇ No.
  • Each wire having an outer diameter of 9.4 mm and a length of 3 m and coated with 31 insulating layers was energized at 140 A, and the temperature of the conductor surface at the center of the wire was measured.
  • the presence or absence of a sea-island structure in the cross section of the insulation layer can be determined by preparing thin film sections from the insulation layer taken from each wire using the freezing microtome method, and staining the samples with ruthenium tetroxide, osmium tetroxide, tungsten phosphate, etc. Observation was made using a transmission electron microscope and visual judgment was made.
  • the insulating layer contains an olefin resin and a resin incompatible with the olefin resin as a resin component, and the olefin resin and the incompatible resin form a sea-island structure.
  • Test No. whose thermal conductivity is 0.5 W/m ⁇ K or more and whose volume resistivity is 1 ⁇ 10 13 ⁇ cm or more. 1 ⁇ No. Insulating layer No. 22 had good results in all aspects of heat dissipation, insulation, mechanical strength, and oil resistance.
  • the electric wire had excellent heat dissipation properties, as well as high insulation properties, mechanical strength, and high oil resistance.

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  • Organic Insulating Materials (AREA)

Abstract

Le fil électrique selon la présente divulgation comprend un conducteur formé à partir d'un fil unique ou un conducteur formé à partir de multiples torons entrelacés et une couche isolante recouvrant la périphérie externe du conducteur, la couche isolante contenant un composant de résine, une première charge et une seconde charge ; le composant de résine contenant une résine oléfinique et une résine incompatible avec la résine oléfinique ; la résine oléfinique et la résine incompatible avec la résine oléfinique formant une structure île et mer ; la première charge étant formée à partir de graphite ; la seconde charge étant formée à partir d'un oxyde métallique, d'un hydroxyde métallique, ou d'une combinaison de ces ingrédients ; la première charge présentant un rapport de masse de 10/100 à 80/100 par rapport au composant de résine ; et la couche isolante présentant une conductivité thermique supérieure ou égale à 0,5 W/m·K à 25 °C et une résistivité de volume supérieure ou égale à 1 x 1013 Ω·cm.
PCT/JP2022/019677 2022-05-09 2022-05-09 Fil électrique et câble WO2023218506A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013147586A (ja) * 2012-01-20 2013-08-01 Mitsui Chemicals Inc 難燃性樹脂組成物及びその製造方法、並びにその成形体及び電線
JP2018517817A (ja) * 2015-06-18 2018-07-05 ダウ グローバル テクノロジーズ エルエルシー 熱伝導性エラストマー複合体

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013147586A (ja) * 2012-01-20 2013-08-01 Mitsui Chemicals Inc 難燃性樹脂組成物及びその製造方法、並びにその成形体及び電線
JP2018517817A (ja) * 2015-06-18 2018-07-05 ダウ グローバル テクノロジーズ エルエルシー 熱伝導性エラストマー複合体

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