WO2023054036A1 - Fil électrique, et procédé de fabrication de fil électrique - Google Patents

Fil électrique, et procédé de fabrication de fil électrique Download PDF

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Publication number
WO2023054036A1
WO2023054036A1 PCT/JP2022/034853 JP2022034853W WO2023054036A1 WO 2023054036 A1 WO2023054036 A1 WO 2023054036A1 JP 2022034853 W JP2022034853 W JP 2022034853W WO 2023054036 A1 WO2023054036 A1 WO 2023054036A1
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Prior art keywords
coating layer
fillers
electric wire
layer
less
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PCT/JP2022/034853
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English (en)
Japanese (ja)
Inventor
佑輔 坂元
康 田村
誠 中林
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株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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Publication of WO2023054036A1 publication Critical patent/WO2023054036A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying
    • 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
    • H01B7/02—Disposition of insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H01F1/113—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • H01F1/26—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
    • H01F1/37—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles in a bonding agent

Definitions

  • the present disclosure relates to electric wires and methods of making electric wires.
  • This application claims priority based on Japanese Patent Application No. 2021-161341 dated September 30, 2021, and incorporates all the descriptions described in the Japanese application.
  • Patent Document 1 discloses a wire harness that connects a battery mounted in an automobile or the like to an electrical device.
  • a wire harness includes a plurality of electric wires and an exterior member that bundles the plurality of electric wires.
  • the electric wire includes a conductor and a covering layer arranged outside the conductor.
  • a plurality of coating layers may be formed.
  • a typical covering layer is, for example, an insulating layer covering the outer circumference of the conductor.
  • the material of the insulating layer is an insulator such as crosslinked polyethylene.
  • the insulating layer is formed by extrusion coating. If the conductor has a small cross-sectional area, the insulating layer is formed by coating. Coating is a method of applying a suspension containing a resin material to the surface of a conductor and heat-treating it to form an insulating layer.
  • the wire of the present disclosure is a conductor; a coating layer disposed outside the conductor;
  • the coating layer is composed of a single layer containing a plurality of fillers and a resin material arranged in the gaps between the plurality of fillers,
  • the maximum thickness of the coating layer is 300 ⁇ m or more and 1000 ⁇ m or less
  • the resin material is mainly composed of polytetrafluoroethylene
  • the average particle size of the plurality of fillers is 20 ⁇ m or more and 250 ⁇ m or less
  • the content of the plurality of fillers in the coating layer is 60% by mass or more and 95% by mass or less.
  • the method for manufacturing the electric wire of the present disclosure includes: preparing a suspension containing a plurality of particles composed of polytetrafluoroethylene and a plurality of fillers; a step of applying the suspension to a surface of an electric wire material containing at least a conductor to form a single coating layer; heat-treating the coating layer at a temperature equal to or higher than the melting point of the polytetrafluoroethylene to form a coating layer on the surface of the wire material;
  • the average particle size of the plurality of fillers is 20 ⁇ m or more and 250 ⁇ m or less,
  • the content of the plurality of fillers in the suspension in the total mass of the plurality of particles and the plurality of fillers is 60% by mass or more and 95% by mass or less,
  • the maximum thickness of the coating layer is 300 ⁇ m or more and 1000 ⁇ m or less.
  • FIG. 1 is a partial longitudinal sectional view of the electric wire according to Embodiment 1.
  • FIG. FIG. 2 is an enlarged photograph of the surface of the coating layer provided on the electric wire of FIG.
  • FIG. 3 is an explanatory diagram showing changes in the state of polytetrafluoroethylene in the electric wire manufacturing method according to the first embodiment.
  • FIG. 4 is an explanatory diagram showing changes in the state of polytetrafluoroethylene in the electric wire manufacturing method of the comparative example.
  • FIG. 5 is a graph showing the effects of the maximum thickness of the coating layer and the average particle size of the filler described in Test Example 1 on the state of formation of the coating layer.
  • 6 is a partial vertical cross-sectional view of the electric wire according to Embodiment 2.
  • One of the purposes of the present disclosure is to provide an electric wire manufactured with good productivity.
  • Another object of the present disclosure is to provide an electric wire manufacturing method for manufacturing an electric wire having a coating layer formed by coating with high productivity.
  • the electric wire of the present disclosure is excellent in productivity.
  • the electric wire manufacturing method of the present disclosure can manufacture electric wires with high productivity.
  • the electric wire according to the embodiment is a conductor; a coating layer disposed outside the conductor;
  • the coating layer is composed of a single layer containing a plurality of fillers and a resin material arranged in the gaps between the plurality of fillers,
  • the maximum thickness of the coating layer is 300 ⁇ m or more and 1000 ⁇ m or less
  • the resin material is mainly composed of polytetrafluoroethylene
  • the average particle size of the plurality of fillers is 20 ⁇ m or more and 250 ⁇ m or less
  • the content of the plurality of fillers in the coating layer is 60% by mass or more and 95% by mass or less.
  • the coating layer is composed of a single layer with a maximum thickness of 300 ⁇ m or more and 1000 ⁇ m or less. That is, the coating layer is formed by one coating. Therefore, it can be said that the electric wire according to the embodiment is manufactured with good productivity.
  • the PTFE contained in the coating layer has excellent heat resistance.
  • the filler contained in the coating layer also has excellent heat resistance. Therefore, the coating layer of the electric wire according to the embodiment has excellent heat resistance.
  • an electric wire provided with a coating layer with a low PTFE content also has the advantage of being low cost.
  • the covering layer may be an insulating layer.
  • the coating layer functions as an insulating layer. Since PTFE has excellent insulating properties, an insulating layer containing PTFE exhibits excellent insulating properties.
  • the term “insulating” as used herein means having an electrical resistivity of 10 8 ⁇ m or more.
  • the covering layer may be a shielding layer.
  • each of the insulating layer and the shielding layer may have the configuration of the coating layer described in ⁇ 1> above.
  • the content of the plurality of fillers may be 60% by mass or more and 80% by mass or less.
  • the filler content is within the above range, it is easy to increase the thickness of the coating layer when producing an electric wire. The reason for this will be explained in the embodiments described later.
  • the average particle size of the plurality of fillers may be 100 ⁇ m or more and 250 ⁇ m or less.
  • the average particle diameter of the filler is within the above range, it is easy to increase the thickness of the coating layer when producing an electric wire. The reason for this will be explained in the embodiments described later.
  • the constituent material of the plurality of fillers is at least one selected from the group consisting of calcium carbonate, aluminum oxide, silicon dioxide, aluminum nitride, boron nitride, titanium oxide, magnesium hydroxide, silicon carbide, silicon nitride, ferrite, and sendust. Seeds are fine.
  • various properties are imparted to the coating layer.
  • calcium carbonate, aluminum oxide, silicon dioxide, aluminum nitride, boron nitride, titanium oxide, magnesium hydroxide, silicon carbide, and silicon nitride are insulating and have excellent thermal conductivity. Fillers made of these materials improve the heat dissipation of the coating layer. Ferrite and sendust are non-insulating. Therefore, fillers made of these materials improve the electromagnetic shielding properties of the coating layer.
  • a method for manufacturing an electric wire includes: preparing a suspension containing a plurality of particles composed of polytetrafluoroethylene and a plurality of fillers; a step of applying the suspension to a surface of an electric wire material containing at least a conductor to form a single coating layer; heat-treating the coating layer at a temperature equal to or higher than the melting point of the polytetrafluoroethylene to form a coating layer on the surface of the wire material;
  • the average particle size of the plurality of fillers is 20 ⁇ m or more and 250 ⁇ m or less,
  • the content of the plurality of fillers in the suspension in the total mass of the plurality of particles and the plurality of fillers is 60% by mass or more and 95% by mass or less,
  • the maximum thickness of the coating layer is 300 ⁇ m or more and 1000 ⁇ m or less.
  • the suspension contains a plurality of fillers together with PTFE.
  • the average particle size of the filler and the blending ratio of the filler in the suspension are each adjusted within a predetermined range.
  • a coating layer having a maximum thickness of 300 ⁇ m or more and 1000 ⁇ m or less can be formed by one coating by the electric wire manufacturing method according to the embodiment. Therefore, according to the method for manufacturing an electric wire according to the embodiment, an electric wire having a coating layer formed by coating can be manufactured with high productivity.
  • the electric wire 1 shown in FIG. 1 includes a conductor 10 , an adhesive layer 11 , an insulating layer 12 and a protective layer 13 .
  • the adhesive layer 11 and the protective layer 13 are not essential components.
  • the insulating layer 12 is the covering layer 3 with a specific configuration.
  • the electric wire 1 of this example may be, for example, an electric wire provided in a wire harness mounted on an automobile, or may be an electric wire for a motor coil.
  • the cross-sectional shape of the conductor 10 is not particularly limited.
  • the cross-sectional shape of the conductor 10 may be a circle including a perfect circle, or a polygon including a rectangle.
  • a nominal cross-sectional area of the conductor 10 is, for example, 0.1 mm 2 or more and 150 mm 2 or less. If the conductor 10 has a large cross-sectional area, the insulating layer 12 is formed by extrusion coating or the like. The insulating layer 12 of this example is the coating layer 3 formed by coating as described later. The maximum thickness of the coating layer 3 in this example is 300 ⁇ m or more and 1000 ⁇ m or less. Therefore, the cross-sectional area of the conductor 10 in this example is large enough to ensure insulation by the covering layer 3 having the maximum thickness.
  • the covering layer 3 forming the insulating layer 12 is composed of a single layer. If, unlike the present example, the insulating layer 12 is composed of multiple layers, a boundary is formed between two adjacent layers. Therefore, by observing the cross section along the thickness direction of the coating layer 3, it can be easily confirmed whether or not the coating layer 3 is composed of a single layer. Observing the cross section along the thickness direction of the coating layer 3 of this example, if the boundary cannot be confirmed, it can be said that the coating layer 3 is composed of a single layer.
  • the maximum thickness of the coating layer 3 is 300 ⁇ m or more and 1000 ⁇ m or less.
  • the maximum thickness of the coating layer 3 can be obtained as follows. The coating layer 3 is cut along the thickness direction of the coating layer 3 . A cut surface of the coating layer 3 is observed, and the thickness of the coating layer 3 is actually measured at a plurality of different portions of the coating layer 3 . Measurement points shall be 10 or more.
  • the thickness of the coating layer 3 is the length from the contact point with the conductor 10 on the cut surface to the surface of the coating layer 3 .
  • the largest value among the measured thicknesses is the maximum thickness.
  • the maximum thickness of the coating layer 3 may be, for example, 500 ⁇ m or more, or even 800 ⁇ m or more.
  • the minimum thickness of the coating layer 3 is equal to or greater than the average particle size of the filler 5, which will be described later. The smallest value among the measured thicknesses is the minimum thickness.
  • the coating layer 3 includes a resin material 4 and a plurality of fillers 5.
  • the magnification of FIG. 2 is 200 times.
  • One scale placed in the lower right of the photograph is 20 ⁇ m. That is, it is 200 ⁇ m on the tenth scale.
  • the particulate portion having unevenness in FIG. 2 is the filler 5 .
  • the resin material 4 is the portion with few irregularities arranged in the gaps between the plurality of fillers 5 .
  • the resin material 4 is mainly composed of PTFE.
  • PTFE is excellent in insulation and heat resistance. Therefore, the insulating layer 12 composed of the covering layer 3 is excellent in insulating properties and heat resistance.
  • the resin material 4 may contain an additive resin.
  • the added resin can exhibit the function of suppressing the formation of pinholes in the coating layer 3 .
  • additive resins include thermoplastic fluororesins other than PTFE, heat-resistant engineering plastics, and heat-resistant elastomers.
  • the thermoplastic fluororesin is, for example, PFA (perfluoroalkoxy alkane), FEP (perfluoroethylene propene copolymer), or ETFE (ethylene tetrafluoroethylene copolymer).
  • Engineering plastics are, for example, PAI (polyamide), PI (polyamide), PEEK (polyether ether ketone), or PES (polyether sulfone).
  • the heat-resistant elastomer is, for example, fluororubber or silicone rubber.
  • the content of PTFE in the resin material 4 containing the added resin that is, the content of PTFE when the resin material 4 is taken as 100% by mass is, for example, 50% by mass or more. It is preferable that the content of PTFE in the resin material 4 is as high as possible.
  • the content of PTFE in the resin material 4 can be measured, for example, by a combination of differential scanning calorimetry (DSC) and X-ray elemental analysis.
  • the filler 5 of this example is not particularly limited as long as it has a predetermined insulating property.
  • the filler 5 is particles made of an insulating inorganic material.
  • the constituent material of the filler 5 is, for example, calcium carbonate, aluminum oxide, silicon dioxide, aluminum nitride, boron nitride, titanium oxide, magnesium hydroxide, silicon carbide, or silicon nitride. These inorganic materials are insulating and have excellent thermal conductivity.
  • the filler 5 made of these inorganic materials improves the heat dissipation of the coating layer 3 .
  • the plurality of fillers 5 may be a mixture of fillers 5 of different materials.
  • the content of the plurality of fillers 5 in the coating layer 3, that is, the content of the plurality of fillers 5 when the coating layer 3 is taken as 100% by mass is 60% by mass or more and 95% by mass or less. If the content of the filler 5 is 60% by mass or more, cracks are less likely to occur in the coating layer 3 during production of the coating layer 3 . The mechanism by which cracks are less likely to occur in the coating layer 3 will be described in the item of the electric wire manufacturing method. If the content of the fillers 5 is 95% by mass or less, the plurality of fillers 5 are integrated by the resin material 4, and the shape of the coating layer 3 is easily maintained.
  • the content of the plurality of fillers 5 in the coating layer 3 can be obtained as follows. First, part of the covering layer 3 is peeled off from the conductor 10, and the mass of the covering layer 3 is measured. Next, the coating layer 3 is heated to remove the resin material 4 in the coating layer 3 by thermal decomposition. The heating temperature is, for example, 500° C. or higher. The mass of filler 5 obtained by removing resin material 4 is measured. By dividing the mass of the filler 5 by the mass of the coating layer 3 and multiplying by 100, the content of the filler 5 in the coating layer 3 can be obtained.
  • the content of the filler 5 may be 65% by mass or more, or may be 70% by mass or more.
  • the range of the content of the filler 5 is, for example, 60% by mass or more and 80% by mass or less. If the content of the filler 5 is within the above range, it is easy to obtain a thick coating layer 3 that is difficult to separate from the conductor 10 .
  • the average particle size of the plurality of fillers 5 is 20 ⁇ m or more and 250 ⁇ m or less. If the average particle diameter of the filler 5 is 20 ⁇ m or more, the thickness of the coating layer 3 can be easily increased when the coating layer 3 is formed. Since the maximum thickness of the coating layer 3 is 300 ⁇ m or more and 1000 ⁇ m, if the average particle diameter of the filler 5 is too large, the coating layer 3 will easily peel off from the surface of the conductor 10 . If the average particle diameter of filler 5 is 250 ⁇ m or less, coating layer 3 is less likely to peel off from the surface of conductor 10 .
  • the average particle size of the filler 5 may be 50 ⁇ m or more, or may be 100 ⁇ m or more.
  • the average particle size range of the filler 5 is, for example, 100 ⁇ m or more and 250 ⁇ m or less. If the average particle size of the filler 5 is within the above range, it is easy to obtain a thick coating layer 3 that is difficult to separate from the conductor 10 .
  • the average particle size of the filler 5 can be obtained as follows. First, part of the covering layer 3 is peeled off from the conductor 10 . The coating layer 3 is heated to remove the resin material 4 in the coating layer 3 by thermal decomposition. Then, the filler 5 obtained by removing the resin material 4 is subjected to a particle size distribution analyzer.
  • the particle size analyzer is, for example, a commercially available particle size analyzer using laser diffraction.
  • the average particle size of the filler 5 in this example is the particle size at which the cumulative frequency is 50% in the mass-based particle size distribution.
  • the adhesive layer 11 improves adhesion between the conductor 10 and the insulating layer 12 .
  • the constituent material of the adhesive layer 11 preferably has a heat resistance equal to or higher than that of the resin material of the coating layer 3 .
  • fluororesins such as PTFE, adhesive PFA, and FEP can be used as a constituent material of the adhesive layer 11.
  • a silane coupling agent, PI, PAI, primer, or the like can be used as the adhesive layer 11 .
  • the thickness of the adhesive layer 11 is, for example, 1 ⁇ m or more and 100 ⁇ m or less.
  • the adhesive layer 11 is formed by coating or the like.
  • the protective layer 13 protects the insulating layer 12 .
  • the insulating layer 12 of this example includes a plurality of fillers 5 , the fillers 5 may drop off from the surface of the insulating layer 12 . If the protective layer 13 covers the insulating layer 12, the filler 5 is prevented from coming off.
  • the constituent material of the protective layer 13 should have heat resistance equal to or higher than that of the resin material of the coating layer 3 .
  • PTFE poly(ethylene glycol)
  • adhesive PFA poly(ethylene glycol)
  • fluorine resin such as FEP
  • silane coupling agent PI
  • PAI PAI
  • the thickness of the protective layer 13 is, for example, 1 ⁇ m or more and 100 ⁇ m or less.
  • the protective layer 13 is formed by coating or the like.
  • the electric wire 1 of this example is excellent in productivity.
  • the covering layer 3 provided on the electric wire 1 of this example is composed of a single layer with a maximum thickness of 300 ⁇ m or more and 1000 ⁇ m or less. That is, the coating layer 3 is formed by one coating. Therefore, it can be said that the electric wire 1 according to the embodiment is manufactured with good productivity.
  • the coating layer 3 provided on the electric wire 1 of this example is excellent in insulation and heat resistance.
  • PTFE constituting the resin material 4 of the coating layer 3 is excellent in insulation and heat resistance.
  • the filler 5 is also excellent in insulation and heat resistance.
  • the coating layer 3 composed of the resin material 4 having excellent insulating properties and heat resistance and the plurality of fillers 5 has excellent insulating properties and heat resistance.
  • the content of PTFE in the coating layer 3 is reduced. Since PTFE is relatively expensive, the covering layer 3 with a low PTFE content is low cost.
  • Step A A step of preparing a suspension containing a plurality of PTFE particles and a plurality of fillers
  • Step B By applying the suspension to the surface of the wire material 2 including at least the conductor 10 Steps of forming a single-layer coating layer/Step C: A step of heat-treating the coating layer at a temperature equal to or higher than the melting point of PTFE to form a coating layer 3 on the surface of the wire material 2
  • a liquid component of the suspension is, for example, water.
  • the PTFE particles contained in the suspension are colloidal particles of about 100 nm.
  • the PTFE particles may have a size on the order of ⁇ m that can be confirmed with an optical microscope.
  • the concentration of PTFE particles in the suspension is, for example, 50% by volume or more and 80% by volume or less when the liquid component is 100% by volume.
  • the average particle size of the filler contained in the suspension is 20 ⁇ m or more and 250 ⁇ m or less.
  • the average particle size of the filler in this example is the 50% particle size based on mass.
  • the average particle size of the fillers in the suspension is the same as the average particle size of the fillers 5 in the coating layer 3 shown in FIG. Therefore, the average particle size range of the filler in the raw material is the same as the average particle size range of the filler 5 in the coating layer 3 .
  • the filler content of the total mass of the PTFE particles and filler in the suspension is 60% by mass or more and 95% by mass or less.
  • the above content rate is the same as the content rate of the filler 5 in the coating layer 3 .
  • the suspension may contain a thickening agent.
  • a thickener contributes to suppressing sedimentation of the filler in the suspension.
  • the viscosity of the suspension is, for example, 30 Pa ⁇ s or more and 100 Pa ⁇ s or less.
  • Thickeners are, for example, cellulose-based thickeners or urethane-based thickeners.
  • the concentration of the thickening agent in the suspension is, for example, 1% by volume or more and 5% by volume or less when the liquid component is 100% by volume.
  • step B the surface of the wire material 2 is coated with the suspension to form a coated layer of the suspension on the surface of the wire material 2 .
  • the wire material 2 in this example is obtained by forming an adhesive layer 11 on the surface of a conductor 10 .
  • the method of forming the coating layer conforms to, for example, the method of forming an enamel layer in the production of an enameled wire. Specifically, the electric wire material 2 is passed through a die together with the suspension, and the suspension is adhered to the surface of the electric wire material 2 .
  • the hole diameter of the die is larger than the diameter of the wire material 2 .
  • the thickness of the coating layer is adjusted by the difference between the hole diameter of the die and the diameter of the wire material 2 . If the viscosity of the suspension is high, a thick coating layer is likely to be formed on the surface of the wire material 2 .
  • Step C the coating layer is heat-treated at a temperature equal to or higher than the melting point of PTFE to form the coating layer 3 on the surface of the wire material 2 .
  • the melting point of PTFE is about 320°C.
  • Heat treatment may comprise, for example, a drying treatment and a melting treatment.
  • the drying process is a process that mainly removes liquid components.
  • the temperature of the drying treatment is, for example, 70° C. or more and 150° C. or less, and the drying treatment time is, for example, 10 minutes or more and 60 minutes or less.
  • the melting process is mainly a process of melting PTFE.
  • the melting treatment temperature is, for example, 340° C. or more and 380° C. or less, and the melting treatment time is, for example, 10 minutes or more and 60 minutes or less.
  • the maximum thickness of the coating layer 3 obtained through the step C is 300 ⁇ m or more and 1000 ⁇ m or less.
  • the formation process of the coating layer 3 in the heat treatment will be explained based on the schematic diagram of FIG.
  • the upper part of FIG. 3 shows a state in which a coating layer 30 is formed on the surface of the wire material 2 .
  • the coating layer 30 contains PTFE particles 40 and fillers 5 .
  • the PTFE particles 40 contained in the coating layer 30 aggregate as shown in the middle part of FIG.
  • the coating layer 30 contains the filler 5
  • the PTFE particles 40 are arranged in the gaps between the fillers 5
  • the coating layer 30 is less likely to have gaps.
  • the PTFE particles 40 are melted, and the resin material 4 is arranged so as to fill the gaps between the fillers 5 as shown in the lower part of FIG.
  • the electric wire 1 of the present example can be manufactured with high productivity.
  • the suspension contains a plurality of fillers 5 together with PTFE particles 40 .
  • the average particle size of the filler 5 and the compounding ratio of the filler 5 in the suspension are each adjusted within a predetermined range.
  • the coating layer 3 having a maximum thickness of 300 ⁇ m or more and 1000 ⁇ m or less can be formed by one coating by the electric wire manufacturing method according to the embodiment.
  • FIG. 4 shows a state in which the coating layer 60 is formed on the surface of the wire material 2 .
  • This coating layer 60 contains PTFE particles 40 but does not contain filler.
  • the PTFE particles 40 aggregate as shown in the middle of FIG.
  • a plurality of agglomerates in which the PTFE particles 40 are agglomerated are formed. Gaps are formed between a plurality of aggregates.
  • the melting treatment of step C is performed in this state, a cracked coating layer 6 is formed.
  • the maximum thickness limit of the coating layer 6 is about 40 ⁇ m.
  • Test Example 1 the influence of the average particle diameter of the filler 5 contained in the suspension during the manufacture of the electric wire on the formation of the crack-free coating layer 3 was investigated.
  • a standard suspension containing no filler 5 and multiple test suspensions containing fillers 5 with different average particle sizes were prepared.
  • the average particle size of filler 5 contained in the test suspensions was 2 ⁇ m, 20 ⁇ m, 100 ⁇ m or 250 ⁇ m.
  • the content of filler 5 in the total mass of PTFE particles 40 and filler 5 in the test suspension was 60% by mass.
  • the standard and test suspensions contain 3.5% by volume of cellulosic thickener relative to the liquid component.
  • a standard suspension or test suspension was applied to the board to form a coating layer. At that time, the thickness of the coating layer was adjusted.
  • the coating layer had a thickness of 50 ⁇ m, 500 ⁇ m, 800 ⁇ m, or 1000 ⁇ m when formed into a coating layer by heat treatment.
  • the coating layer was heat-treated to produce a coating layer.
  • drying treatment and melting treatment were sequentially performed.
  • the drying treatment conditions were 150° C. ⁇ 30 minutes.
  • the melt processing conditions were 380° C. ⁇ 30 minutes.
  • the coating layer obtained by the heat treatment was visually observed to confirm whether or not cracks had occurred in the coating layer.
  • the results are shown in the graph of FIG.
  • the horizontal axis of FIG. 5 is the maximum thickness of the coating layer, and the vertical axis is the average particle size of the filler.
  • the unit of both the horizontal axis and the vertical axis is " ⁇ m".
  • circles indicate coating layers that were not cracked, and crosses indicate coating layers that were cracked.
  • the suspension must contain a filler with an average particle size of 20 ⁇ m or more in order to form a thick coating layer with one coating. It was also found that the larger the average particle size of the filler contained in the suspension, the thicker the coating layer.
  • Embodiment 2 the electric wire 1 further provided with the shielding layer 14 on the outer periphery of the insulating layer 12 will be described with reference to FIG. 6 .
  • the configurations of the conductor 10, the adhesive layer 11, the insulating layer 12, and the protective layer 13 in the electric wire 1 are the same as in the first embodiment.
  • the electric wire 1 of this example can be used, for example, as a wire harness.
  • the shielding layer 14 has electromagnetic shielding properties.
  • the shielding layer 14 of this example is the covering layer 3 containing a plurality of fillers 5 .
  • the structure of the covering layer 3 is the same as in FIG.
  • the filler 5 in the shielding layer 14 of this example is composed of a non-insulating inorganic material.
  • a constituent material of the filler 5 is, for example, ferrite or sendust. Ferrite and sendust are magnetic materials.
  • the plurality of fillers 5 may be a mixture of fillers 5 made of ferrite and fillers 5 made of sendust.
  • the electric wire 1 of this example is manufactured by the electric wire manufacturing method described in the first embodiment.
  • the wire material 2 is obtained by forming an adhesive layer 11 and an insulating layer 12 on a conductor 10 .
  • a coating layer 3 is formed on the wire material 2 by the wire manufacturing method described in the first embodiment. Since the filler 5 contained in the coating layer 3 is non-insulating, the coating layer 3 functions as the shielding layer 14 .
  • the insulating layer 12 in the electric wire 1 of Embodiment 2 does not have to be the covering layer 3 containing a plurality of fillers 5 .
  • the insulating layer 12 may be made of PTFE or the like that does not contain the filler 5 .
  • the insulating layer 12 may have the configuration of the covering layer 3 and the shielding layer 14 may have a configuration different from that of the covering layer 3 .
  • the shielding layer 14 is formed by winding a metal tape, for example.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Hard Magnetic Materials (AREA)
  • Soft Magnetic Materials (AREA)
  • Insulated Conductors (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
  • Organic Insulating Materials (AREA)

Abstract

Un fil électrique comprend un conducteur et une couche de revêtement placée sur l'extérieur du conducteur, la couche de revêtement étant constituée d'une couche unique contenant une pluralité de charges et d'un matériau de résine placé dans les espaces entre la pluralité de charges, l'épaisseur maximale de la couche de revêtement étant de 300 à 1 000 µm (inclus), et le matériau de résine ayant du polytétrafluoroéthylène en tant que constituant principal, le diamètre moyen de particules de la pluralité de charges étant de 20 à 250 µm (inclus), et la teneur de la pluralité de charges dans la couche de revêtement étant de 60 à 95 % en masse (inclus).
PCT/JP2022/034853 2021-09-30 2022-09-16 Fil électrique, et procédé de fabrication de fil électrique WO2023054036A1 (fr)

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JP2021-161341 2021-09-30
JP2021161341A JP2023050956A (ja) 2021-09-30 2021-09-30 電線、及び電線の製造方法

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55126977A (en) * 1979-03-23 1980-10-01 Nippon Denso Co Method of connecting refractory insulated wire
JP2013168313A (ja) * 2012-02-16 2013-08-29 Auto Network Gijutsu Kenkyusho:Kk 絶縁電線
JP2021103639A (ja) * 2019-12-25 2021-07-15 株式会社オートネットワーク技術研究所 通信用電線

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55126977A (en) * 1979-03-23 1980-10-01 Nippon Denso Co Method of connecting refractory insulated wire
JP2013168313A (ja) * 2012-02-16 2013-08-29 Auto Network Gijutsu Kenkyusho:Kk 絶縁電線
JP2021103639A (ja) * 2019-12-25 2021-07-15 株式会社オートネットワーク技術研究所 通信用電線

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