WO2022202174A1 - Fil électrique pour communication - Google Patents

Fil électrique pour communication Download PDF

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Publication number
WO2022202174A1
WO2022202174A1 PCT/JP2022/009045 JP2022009045W WO2022202174A1 WO 2022202174 A1 WO2022202174 A1 WO 2022202174A1 JP 2022009045 W JP2022009045 W JP 2022009045W WO 2022202174 A1 WO2022202174 A1 WO 2022202174A1
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Prior art keywords
sheath
wire
polymer
communication
melting point
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PCT/JP2022/009045
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English (en)
Japanese (ja)
Inventor
悠太 安好
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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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Application filed by 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 filed Critical 株式会社オートネットワーク技術研究所
Publication of WO2022202174A1 publication Critical patent/WO2022202174A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors

Definitions

  • This disclosure relates to communication wires.
  • Patent Documents 1 and 2 disclose a twisted pair wire in which a pair of insulated wires made of a conductor and an insulating coating covering the outer periphery of the conductor are twisted together, A communication wire having a sheath made of an insulating material covering the outer periphery of a twisted pair wire is disclosed.
  • Patent Documents 1 and 2 mainly deal with a form called a loose jacket type in which a gap is provided between a sheath and an insulated wire that constitutes a twisted pair wire.
  • a communication wire having a sheath around the outer periphery of a signal wire including a plurality of insulated wires there is a loose jacket type wire having a gap between the sheath and the signal wire.
  • a solid type in which substantially no gap is provided between the sheath and the communication wire, and the material of the sheath is brought into close contact with the surface of the insulated wire that constitutes the signal wire.
  • the loose-jacket type and the solid-type have their own advantages, but the major advantage of the solid-type sheathed communication wire is that the signal line is held down from the outside by the sheath. It is possible to suppress relative position deviation such as loosening of the twisted structure.
  • predetermined communication characteristics can be stably obtained by maintaining a predetermined relative arrangement of the multiple wires.
  • a pair of insulated wires maintains a symmetrical positional relationship, so that the electromagnetic fields generated in each insulated wire cancel each other out, and the influence of electromagnetic noise from the outside can be reduced.
  • the plurality of insulated wires that make up the signal line are held down by the sheath, thereby firmly maintaining the relative arrangement.
  • the deviated relative arrangement is stably maintained as it is. , and it becomes difficult to obtain a predetermined communication characteristic.
  • the twisted pair structure reduces the noise reduction effect.
  • the solid sheath is formed by extrusion molding, a large pressure is applied to the insulated wire constituting the signal line by the molten resin composition. Then, due to the influence of heat and resin pressure, the insulated wires may be displaced or deformed relative to each other, and the insulated wires may be fixed by the sheath in this state.
  • a communication wire having a solid sheath on the outer periphery of a signal wire including a plurality of insulated wires and when extruding the sheath, the insulated wire is affected by the influence of the molten resin composition.
  • An object of the present invention is to provide a communication wire that is less likely to be misaligned or deformed.
  • a communication wire includes a signal wire including a plurality of insulated wires each having a conductor and an insulating coating covering the outer circumference of the conductor, and a solid sheath covering the outer circumference of the signal wire.
  • the composition constituting the sheath has a melt flow rate of 0.8 g/10 minutes or more and 2.1 g/10 minutes or less measured under a load of 2.16 kg at 230°C.
  • a communication wire according to the present disclosure is a communication wire having a solid sheath on the outer periphery of a signal wire including a plurality of insulated wires, and when the sheath is extruded, the melted resin composition causes , the insulated wire is less likely to be displaced or deformed relative to the communication wire.
  • FIG. 1 is a cross-sectional view showing the configuration of a communication wire according to one embodiment of the present disclosure.
  • FIG. 2 is a schematic diagram showing the relationship between polymer temperature and fluidity. A solid line indicates a low melting point, and a dashed line indicates a high melting point.
  • FIG. 3 is a cross-sectional view for explaining the definition of the degree of deformation of a core wire for a communication wire in which the deformation of the insulation coating has increased.
  • FIG. 4 is a cross-sectional view for explaining the definition of the degree of filling of a communication wire with a low filling property of the sheath.
  • FIG. 5 is a cross-sectional view for explaining the definition of the degree of heat deformation of a communication wire in which the sheath is greatly deformed by heat.
  • a communication wire includes a signal wire including a plurality of insulated wires each having a conductor and an insulating coating covering the outer circumference of the conductor, and a solid sheath covering the outer circumference of the signal wire.
  • the composition constituting the sheath has a melt flow rate of 0.8 g/10 minutes or more and 2.1 g/10 minutes or less measured under a load of 2.16 kg at 230°C.
  • the sheath has a solid structure, and the material constituting the sheath is in close contact with the surface of the insulated wire that constitutes the signal line. has a melt flow rate of 0.8 g/10 minutes or more. Therefore, when the sheath is formed by extrusion molding, the area around the insulated wire is easily filled with the composition forming the sheath, and the pressure applied to the insulated wire can be reduced. As a result, the insulated wire is less likely to change in relative position or deform due to pressure during extrusion. In addition, since the composition that constitutes the sheath has high fluidity, the composition is likely to be densely filled at various locations around the signal wire, including the valleys between the plurality of insulated wires.
  • the sheath firmly holds down the insulated wire in a state where the relative position is not changed or deformed, and it is easy to stably maintain the state where the relative position is not changed or deformed. As a result, it is possible to stably maintain communication characteristics obtained by a plurality of insulated wires having a predetermined relative arrangement. Furthermore, since the melt flow rate of the composition constituting the sheath is suppressed to 2.1 g/10 minutes or less at 230°C, the manufactured communication wire can be placed in a high temperature environment. The sheath is less likely to deform even under mechanical load. Therefore, deformation of the sheath is less likely to affect communication characteristics.
  • the signal line is configured as a twisted pair wire in which a pair of the insulated wires are twisted together. Since the signal line is configured as a twisted pair, the relative positions of the pair of insulated wires are more stable than when the pair of insulated wires are arranged in parallel without being twisted together. easy to hold. Therefore, in combination with the effect of setting the lower limit of the melt flow rate of the composition constituting the sheath, when the sheath is manufactured by extrusion molding, the relative positions of the insulated wires are particularly unlikely to change. As a result, it is easy to maintain particularly favorable communication characteristics of the communication wire.
  • Another member should not be provided between the sheath and the signal line. Since there is no other member such as a shielding metal foil, a metal braid, or a release agent layer between the sheath and the signal line, the structure of the communication wire is simplified. In this case, the insulated wire that constitutes the signal line is in direct contact with the sheath. It is possible to sufficiently suppress the influence on the communication characteristics due to deformation of the sheath and thermal deformation of the formed sheath.
  • the sheath preferably contains a low melting point polymer having a melt flow rate of 15 g/10 minutes or more measured under a load of 2.16 kg at 230°C and a melting point of 140°C or more. Since the composition constituting the sheath contains a low-melting-point polymer having a low melting point and a high melt flow rate, insulation is achieved when the melted sheath composition is introduced around the outer periphery of the signal line and extrusion molding is performed. The composition can be densely packed under stable conditions while the coating is less likely to be displaced or deformed.
  • the proportion of the low-melting polymer in the polymer components constituting the sheath is preferably larger than the proportion of the low-melting polymer in the polymer components constituting the insulating coating.
  • the insulating coating is less likely to be deformed by the heat of the melted sheath composition, and the sheath can be formed under stable conditions while maintaining the insulated wire in a state in which displacement and deformation are small.
  • the sheath may further contain a high melting point polymer having a melting point of 160°C or higher.
  • a sheath constituent material a low melting point polymer that exhibits high fluidity even at a relatively low temperature and a high melting point polymer that has a high melting point and therefore low fluidity are mixed to obtain a composition that constitutes the sheath as a whole. It is easy to adjust the melt flow rate within the predetermined range.
  • Both the low-melting polymer and the high-melting polymer preferably contain polyolefin.
  • Polyolefin is a polymer having a low dielectric constant and a low dielectric loss tangent, and when used as a constituent material of communication wires, it provides high communication characteristics.
  • the melting point and melt flow rate can be adjusted over a wide range by adjusting the type and degree of polymerization of the monomer units. and melt flow rate can be easily adjusted to the desired range.
  • melt flow rate refers to a value measured at 230° C. with a load of 2.16 kg. Unless otherwise specified, other properties are values measured at room temperature in the atmosphere.
  • a certain component being the main component refers to a state in which the component accounts for 50% by mass or more of the total mass of the material.
  • the polymer includes those having a relatively low degree of polymerization, such as oligomers. Terms such as parallel, perpendicular, orthogonal, circular, etc. that indicate the shape and arrangement of members include not only geometrically strict concepts but also errors within the allowable range for communication wires.
  • FIG. 1 shows a cross-sectional view of a communication wire 1 according to an embodiment of the present disclosure, cut perpendicularly to the axial direction.
  • the communication wire 1 has a signal line 10.
  • the signal line 10 includes multiple insulated wires (core wires) 11 .
  • the communication wire 1 further has a sheath 20 covering the outer periphery of the signal wire 10 .
  • the sheath 20 has a solid structure.
  • the material constituting the sheath 20 will be described in detail later, but the MFR of the composition constituting the sheath 20 is 0.8 g/10 minutes or more and 2.1 g/10 minutes or less.
  • Each insulated wire 11 that constitutes the signal line 10 has a conductor 12 and an insulating coating 13 that covers the outer circumference of the conductor 12 .
  • the number of insulated wires 11 constituting the signal line 10 is not particularly limited, and may be two, four, or the like.
  • a communication wire 1 including a pair of insulated wires 11, 11 as a signal wire 10 can be used to transmit differential signals.
  • the signal line 10 may be configured as a parallel pair of wires in which a pair of insulated wires 11, 11 are arranged in parallel and are in contact with each other with their axial directions parallel to each other. 11 are preferably configured as twisted wire pairs that are twisted together.
  • a twisted pair wire is superior to a parallel pair wire in the effect of stably holding the relative positions of the pair of insulated wires 11 , 11 .
  • the signal line 10 is configured as a twisted pair wire will be mainly dealt with.
  • the applicable frequency of the communication wire 1 is not particularly limited, but it is preferable that it can be used in a frequency range of at least 1 MHz to 50 MHz.
  • the conductor 12 may be made of a single wire, it is preferably made of a stranded wire in which a plurality of strands (for example, 7 wires) are twisted together from the viewpoint of increasing flexibility when bending. In this case, after twisting the strands, compression molding may be performed to form a compressed stranded wire.
  • the conductor 12 is configured as a stranded wire, all of them may be made of the same wire, or may be made of two or more kinds of wire.
  • the insulating coating 13 contains an insulating polymer.
  • the type of polymer is not particularly limited, but examples include olefin polymers such as polyolefins and olefin copolymers, halogen polymers such as polyvinyl chloride, various engineering plastics, elastomers, and rubbers.
  • the polymers may be used singly or in combination of two or more by mixing, laminating, or the like.
  • the polymer may be crosslinked or foamed.
  • the insulating coating 13 may contain additives as appropriate in addition to the polymer. Examples of additives include flame retardants, auxiliary flame retardants, copper damage inhibitors, antioxidants, and metal oxides such as zinc oxide.
  • polyolefin As the polymer that constitutes the insulating coating 13 . Furthermore, it is preferable that polyolefin is the main component of the polymer component. Since polyolefin has a low dielectric constant and a low dielectric loss tangent, it is possible to obtain high communication characteristics in the communication wire 1 by using it as a constituent material of the insulating coating 13 . In particular, it is preferable to use polypropylene (PP) as the polyolefin. Polypropylene has a relatively high melting point and easily suppresses deformation due to temperature and resin pressure when forming the sheath 20 .
  • the insulating coating 13 preferably contains a polyolefin component having a crystal melting energy of 85 J/g or more, more preferably 95 J/g or more. Insulating coating 13 containing a polymer having a large crystal melting energy enhances the effect of preventing deformation of insulating coating 13 when sheath 20 is formed. Insulating coating 13 preferably contains an acid-modified resin such as acid-modified SEBS in addition to polyolefin from the viewpoint of ensuring flexibility and extrusion moldability.
  • the insulating coating 13 may contain lubricants such as silicone resin, erucic acid monoamide, and stearic acid (octadecanoic acid). Since these lubricants form a fine uneven structure on the surface of the insulating coating 13, they enhance the peelability between the signal line 10 and the sheath 20 without using a separate release agent such as inorganic powder.
  • the amount of the lubricant to be added is preferably 5 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the polymer component forming the insulating coating 13 .
  • the sheath 20 may contain a low melting point polymer having an MFR of 15 g/10 minutes or more and a melting point of 140° C. or less at a higher content rate than the insulating coating 13.
  • the insulating coating 13 may contain no low-melting polymer, or may contain a lower amount of low-melting polymer than the sheath 20 as a percentage of the total polymer composition.
  • the insulating coating 13 does not contain a low melting point polymer.
  • the polymer species such as polypropylene, which is the main component of the polymer component constituting the insulating coating 13, preferably has a melting point of 160° C. or higher. It is also preferred to have an MFR of less than 15g/10min, even less than 5g/10min.
  • the diameter of the conductor 12 and the thickness of the insulating coating 13 are not particularly limited, but from the viewpoint of reducing the diameter of the insulated wire 11, etc., the cross-sectional area of the conductor should be less than 0.22 mm 2 , particularly 0.20 mm 2 . It is preferable to keep the following. Moreover, it is preferable that the thickness of the insulating coating 13 is 0.30 mm or less, particularly 0.20 mm or less. When such conductor cross-sectional area and coating thickness are employed, the outer diameter of the insulated wire 11 can be 1.0 mm or less, and further 0.90 mm or less.
  • the characteristic impedance of the communication wire 1 can be easily kept within the range of 100 ⁇ 10 ⁇ required for Ethernet communication.
  • the twist pitch of the twisted pair wire a form of 10 mm or more and 30 mm or less can be exemplified.
  • the sheath 20 fulfills functions such as protection of the signal wire 10 and stabilization of the relative position of the communication wire 1 with respect to the signal wire 10 .
  • the sheath 20 has a solid construction. That is, between the sheath 20 and the insulated wires 11, 11 constituting the signal line 10, no gap is provided except for unavoidable ones.
  • the constituent material of the sheath 20 is in close contact with substantially the entire region exposed to the outside as a whole.
  • the gap that can inevitably occur between the sheath 20 and the insulated wires 11, 11 forming the signal line 10 generally refers to a gap that can maintain the filling degree R2 of the sheath 20 at 20% or more.
  • the thickness of the sheath 20 is set appropriately so that effects such as protection of the signal line 10 and retention of the relative positions of the insulated wires 11 and 11 on the signal line 10 can be sufficiently obtained, and a desired characteristic impedance can be obtained. You can set it.
  • the thickness at the thinnest point should be 0.2 mm or more, preferably 0.3 mm or more.
  • the thickness of the sheath 20 is set to It should be 1.0 mm or less, more preferably 0.8 mm or less.
  • the outer diameter of the entire communication wire 1 defined by the outer peripheral surface of the sheath 20 should be 4.0 mm or less, or preferably 3.5 mm or less.
  • the sheath 20 and the signal line 10 are in direct contact with each other without any other member provided.
  • examples of other members include a shield body such as a metal foil or a metal braid, a tape body wound around the outer periphery of the signal line 10, and a release agent containing an inorganic powder material arranged around the outer periphery of the signal line 10. be able to.
  • a release agent containing an inorganic powder material may affect the communication characteristics of the communication wire 1 due to its high dielectric constant, and is preferably not disposed.
  • the sheath 20 has a solid structure, so that the signal wire 10 can be held down from the outside and the structure of the signal wire 10 can be stably maintained.
  • characteristics related to communication such as characteristic impedance can be stably obtained as designed.
  • the signal line 10 is configured as a twisted pair in which a pair of insulated wires 11, 11 are twisted together, the twisted structure stabilizes the mutual arrangement of the insulated wires 11, 11. In combination with the effect of being made, a high effect can be obtained in improving and stabilizing the characteristics.
  • the solid sheath 20 holds the twisted structure of the twisted pair while suppressing loosening.
  • the composition constituting the solid sheath 20 is 0.8 g/10 minutes or more and 2.1 g at 230° C. and a load of 2.16 kg as the whole composition. /10 minutes or less.
  • the sheath 20 is formed by extruding a molten resin composition around the signal line 10 .
  • the sheath provided in the communication wire 1 including a plurality of insulated wires 11 includes a solid type in which there is substantially no gap between the sheath and the signal line 10, and a sheath with a gap between the sheath and the signal line 10. There is a loose jacket type provided with.
  • the composition constituting the sheath 20 when forming the solid sheath 20, it is necessary to adhere the composition constituting the sheath 20 to the insulating coating 13 constituting the signal line 10 in a melted state. Larger heat and pressure are applied to the insulated wires 11, 11 from the melted composition than in the case of the jacket type.
  • the pair of insulated wires 11 and 11 may be displaced relative to each other, and the insulated wires 11 and 11 may Deformation may occur.
  • the insulating coating 13 tends to be crushed in the central portion where the pair of insulated wires 11, 11 are adjacent to each other. If the insulated wires 11, 11 constituting the signal line 10 are displaced or deformed relative to each other, the symmetry of the signal line 10 is deteriorated.
  • a decrease in symmetry causes a change in the characteristic impedance due to a change in the distance between the conductors 12, 12, a deterioration in electromagnetic noise resistance due to the inability to cancel out the electromagnetic field between the conductors 12, 12, and the like. It causes deterioration of communication characteristics.
  • the composition constituting the sheath 20 has an MFR of 0.8 g/10 min or more and has excellent fluidity.
  • the area around the insulated wires 11, 11 is expanded until the molten resin composition adheres to the surfaces of the insulated wires 11, 11 constituting the signal line 10 during extrusion molding without applying pressure. In addition, it tends to be densely packed.
  • the molten resin composition also penetrates deeply into the position corresponding to the valley between the two insulated wires 11, 11, that is, the inter-wire region A0, and a high filling degree R2 is easily obtained.
  • the composition that constitutes the sheath 20 has an MFR of 0.8 g/10 minutes or more and exhibits high fluidity, so that when the sheath 20 is formed, the insulated wires 11, 11 are positioned relative to each other. It is hard to shift or deform, and the state of small shift or deformation of the relative positions is firmly maintained. As a result, the symmetry of the signal line 10 is kept high, and the communication characteristics of the communication wire 1, such as noise resistance, can be kept high. From the viewpoint of particularly enhancing these effects, the MFR of the composition constituting the sheath 20 is preferably 1.0 g/10 minutes or more, and more preferably 1.1 g/10 minutes or more.
  • Suppression of relative position deviation and deformation of the insulated wires 11, 11 can be evaluated by the core wire deformation degree R1.
  • the core wire deformation degree R1 As shown in FIG. 3 for the communication wire 1A in which the deformation of the insulation coating 13 is large, when the insulated wires 11, 11 are deformed from a circular shape, the length of the longest straight line is defined as the maximum outer diameter D1, and the length of the shortest straight line is defined as the minimum outer diameter D2.
  • the degree of deformation R1 of the core wire is less than 15%, and further less than 5%, it can be considered that the displacement and deformation of the relative positions of the insulated wires 11, 11 are sufficiently suppressed.
  • the dense packing of the constituent material of the sheath 20 around the outer peripheries of the insulated wires 11, 11 can be evaluated by the filling degree R2 described above. If the filling degree R2 is 20% or more, or further 40% or more, it can be considered that the outer periphery of the signal line 10 is sufficiently densely filled with the constituent material of the sheath 20 .
  • the MFR of the composition forming the sheath 20 is suppressed to 2.1 g/10 minutes or less as described above.
  • the sheath 20 may be deformed by heating or by applying a mechanical load under the heating environment. The deformation of the sheath 20 may affect the communication characteristics of the communication wire 1, such as changes in characteristic impedance.
  • the sheath 20 is made of a material that provides an MFR of 2.1 g/10 minutes or less and can maintain its viscosity even at high temperatures, deformation does not easily occur even in a high-temperature environment. A change in the characteristics of the electrical wire 1 can be kept small.
  • the MFR of the composition constituting the sheath 20 is preferably 2.0 g/10 minutes or less, and 1.8 g/10 minutes or less.
  • Suppression of heat deformation of the sheath 20 at high temperatures can be evaluated by the degree of heat deformation R3.
  • a heat deformation test is performed in which the communication wire 1 is subjected to a heating temperature and a load assumed in the environment in which the communication wire 1 is used. Then, as shown in FIG. 5 for the communication wire 1C in which the sheath 20 is greatly deformed by heat, the outer diameter of the wire before the heat deformation test indicated by the broken line is D3, The outer diameter D4 of the electric wire after the heat deformation test indicated by the solid line is measured.
  • R3 degree of heat deformation
  • the conditions for the heat deformation test were as follows: at 130° C., the communication wire 1 was sandwiched between two blades having a width of 0.7 mm perpendicular to the facing direction from two opposing locations on the surface of the sheath 20, and a load of 300 gf was applied to each blade. can be exemplified.
  • the MFR of the composition that constitutes the sheath 20 varies depending on the type of polymer used (type of monomer unit and repeating pattern), the degree of polymerization, the mixing ratio when mixing a plurality of polymers, the type and amount of additive, and the like. can be adjusted.
  • the type of polymer constituting the sheath 20 is not particularly limited as long as the composition constituting the sheath 20 as a whole gives an MFR within the above-described predetermined range. Similar materials can be used. That is, olefin-based polymers such as polyolefins and olefin-based copolymers, halogen-based polymers such as polyvinyl chloride, various engineering plastics, elastomers, and rubbers can be used.
  • the polymers may be used singly or in combination of two or more by mixing, laminating, or the like.
  • the polymer may be crosslinked or foamed.
  • the sheath 20 may optionally contain additives in addition to the polymer. Examples of additives include flame retardants, flame retardant aids, antioxidants, and metal oxides such as zinc oxide.
  • polyolefin As the polymer that constitutes the sheath 20 , it is preferable to use polyolefin as the polymer that constitutes the sheath 20 . Furthermore, it is preferred that polyolefin accounts for the main component of the polymer component. Since polyolefin has a low dielectric constant and a low dielectric loss tangent, it is possible to obtain high communication characteristics in the communication wire 1 by using it as a constituent material of the sheath 20 . In addition, polyolefins exhibit various MFRs and melting points depending on the type of monomer units, the degree of polymerization, and the like.
  • the sheath 20 preferably contains, as a constituent component, a low melting point polymer having an MFR of 15 g/10 minutes or more and a melting point of 140°C or less.
  • the fluidity of a polymer which is evaluated using MFR as an index, rises sharply as the temperature rises within a range of about ⁇ 20° C. around the melting point.
  • the temperature change of fluidity of a polymer having a melting point of about 140° C. is indicated by a solid line.
  • Extrusion of the polyolefin-based sheath 20 is typically performed at a molding temperature in the range of about 190° C. to 240° C., as indicated in FIG.
  • the melting point of the polymer is 140° C.
  • the fluidity is already high at the molding temperature, and exhibits a stable high fluidity. Therefore, the sheath 20 can be molded under stable conditions at the molding temperature.
  • the region where the fluidity rapidly rises with respect to temperature is the region during extrusion molding. It may be included within the molding temperature range. Then, if the molding temperature fluctuates even a little due to changes in the outside air temperature, the state of the molding apparatus, etc., the fluidity of the resin composition changes greatly, and there is a possibility that the molding conditions cannot be kept stable.
  • the sheath 20 can be formed under stable conditions at a typical extrusion molding temperature. Since the sheath 20 can be stably formed, variations in the communication characteristics of the communication wire 1 can be suppressed.
  • the polymer having a melting point of 140° C. or less is a highly fluid polymer exhibiting an MFR of 15 g/10 minutes or more, the fluidity of the composition constituting the sheath 20 as a whole is increased, and the sheath 20 is formed.
  • the melting point of the low melting point polymer is 135° C. or lower.
  • the MFR of the low melting point polymer is more preferably 20 g/10 minutes or more and 30 g/10 minutes or more.
  • the specific type of the low-melting-point polymer is not particularly limited, it is preferable to use polyolefin as at least a part of the low-melting-point polymer, more preferably as the entire low-melting-point polymer. Among them, it is preferable to use polyethylene. Polyethylene often has a low melting point and high fluidity. As polyethylene, low density polyethylene (LDPE) or high density polyethylene (HDPE) can be preferably used.
  • LDPE low density polyethylene
  • HDPE high density polyethylene
  • the proportion of the low-melting polymer in the constituent material of the sheath 20 is not particularly limited as long as the sheath composition as a whole provides an MFR within the predetermined range. However, it is preferable that the content of the low melting point polymer is higher in the sheath 20 than in the insulating coating 13 . In other words, it is preferable that the proportion of the low melting point polymer in the polymer components constituting the sheath 20 is higher than the proportion of the low melting point polymer in the polymer components constituting the insulating coating 13 . Since the sheath 20 contains more low-melting components than the insulating coating 13, the composition constituting the sheath 20 is fluid when the sheath 20 is extruded using the melted composition.
  • the material forming the insulating coating 13 is less likely to deform due to the heat of the melted sheath material. Thereby, displacement and deformation of the relative positions of the insulated wires 11, 11 when forming the sheath 20 can be effectively suppressed.
  • the specific content ratio of the low-melting polymer in the sheath 20 is not particularly limited, but the MFR of the sheath composition as a whole is sufficiently increased, and the extrusion molding conditions are From the viewpoint of enhancing the stabilizing effect of , it is preferably 5% by mass or more, more preferably 10% by mass or more, or 20% by mass or more.
  • the proportion of the low melting point polymer is preferably 40% by mass or less, more preferably 30% by mass or less.
  • the sheath 20 contains the above low melting point polymer as a polymer component, it preferably contains a high melting point polymer in addition to the low melting point polymer.
  • a high melting point polymer refers to a polymer having a melting point of 160° C. or higher. Since the sheath 20 contains a high-melting-point polymer, the effect of suppressing deformation of the sheath 20 in a high-temperature environment is excellent. Moreover, the mixing ratio of the low-melting polymer and the high-melting polymer makes it easy to adjust the MFR of the composition constituting the sheath 20 as a whole within a predetermined range.
  • the specific type of the high melting point polymer is not particularly limited, it is preferable to use polyolefin as at least part of the high melting point polymer, more preferably as the entire high melting point polymer.
  • polypropylene particularly block polypropylene.
  • Polypropylene has a relatively high melting point and is highly effective in suppressing thermal deformation of the sheath 20 .
  • the MFR of the high-melting-point polymer is not particularly limited, but from the viewpoint of effectively suppressing heat deformation of the sheath 20, it preferably has an MFR of less than 15 g/10 minutes, more preferably less than 5 g/10 minutes. .
  • the ratio of the high melting point polymer in the constituent material of the sheath 20 is not particularly limited as long as the MFR of the sheath composition as a whole can be obtained within a predetermined range. From the viewpoint of being within the range, it is preferably 5% by mass or more, more preferably 10% by mass or more, or 20% by mass or more of the entire polymer component. Also, it is preferably 40% by mass or less, more preferably 30% by mass or less. Furthermore, from the same point of view, the content ratio of the low melting point polymer and the high melting point polymer is in the range of 1:5 to 5:1, further 1:2 in terms of mass ratio of [low melting point polymer]:[high melting point polymer]. It should be in the range of ⁇ 2:1.
  • the sheath 20 may contain a polymer that is neither classified as a low melting point polymer nor a high melting point polymer. Polymers with melting points below 140° C. but MFRs below 15 g/10 min, polymers with melting points between 140° C. and 160° C. correspond to this. Examples of such polymers include acid-modified polymers such as acid-modified SEBS and acid-modified olefinic resins, and olefinic thermoplastic elastomers (TPO). These polymers can be components that enhance the flexibility and extrudability of the sheath 20 .
  • a wire conductor having a conductor cross-sectional area of 0.16 mm 2 was produced by twisting seven copper alloy strands having a wire diameter of ⁇ 0.172 mm and then compressing the strands.
  • An insulating coating composition having the formulation shown in Table 1 below was extruded around the outer periphery of the obtained wire conductor to form an insulating coating having a thickness of 0.19 mm.
  • Two insulated wires thus obtained were twisted together at a pitch of 20 mm to prepare a signal wire.
  • a sheath composition having the composition shown in Table 2 below was extruded around the signal wire to form a solid sheath, and the wires for communication according to Samples 1 to 8 were produced.
  • the overall outer diameter of the communication wire was 3.2 mm, and the thickness of the sheath was approximately 0.76 mm at the thinnest point.
  • Block PP1 Block PP “Novatec EC9GD” manufactured by Japan Polypropylene Corporation
  • Block PP2 Block PP “Novatec BC03C” manufactured by Japan Polypropylene Corporation
  • Homo PP "Novatec EA9FTD” manufactured by Japan Polypro
  • HDPE “Novatec HJ590N” manufactured by Japan Polyethylene Co., Ltd.
  • the formulation of the composition used for forming the insulating coating is as follows.
  • the blending ratio of each component is indicated by the number of parts by mass based on the total of 100 parts by mass of the polymer components.
  • the melting point and MFR (measured at 230°C under a load of 2.16 kg) and the crystal melting energy (measured using a differential scanning calorimeter (DSC) at a temperature change of 10°C/min) are also included. it's shown.
  • the degree of core line deformation when the degree of core line deformation is 5% or more and less than 15%, the degree of core line deformation is evaluated as "A”, and when the degree of core line deformation is less than 5%, the degree of core line deformation is evaluated as "A+", which is particularly small. evaluated.
  • Table 2 shows the compounding ratio of each component of the composition constituting the sheath (parts by mass based on the total of the polymer components being 100 parts by mass) and each evaluation result for Samples 1 to 8.
  • the melting point and MFR are also shown.
  • the content ratio of block PP1 and HDPE is systematically changed. From sample 1 to sample 7, the content ratio of HDPE is increased.
  • HDPE has a melting point of 140° C. or less and an MFR of 15 g/10 minutes or more, and is classified as a low melting point polymer.
  • block PP1 has a melting point of 160° C. or higher and is classified as a high melting point polymer.
  • samples 1 to 7 the MFR of the composition as a whole increases as the HDPE content increases.
  • Samples 2 to 7 which have an MFR of 0.8 g/10 minutes or more, have a small degree of core line deformation and a high degree of sheath filling (both A or A+).
  • block PP2 which has a high MFR but a melting point of 160°C or higher and is classified as a high melting point polymer, was added instead of adding HDPE, which is a low melting point polymer.
  • the added amount of block PP2 is the same as that of HDPE in sample 2, but the MFR of the composition as a whole is lower in sample 8, below 0.8 g/10 min.
  • the degree of core line deformation is high corresponding to the low MFR of the sheath material as a whole.
  • the degree of heat deformation is also high corresponding to the fact that the block PP2 is a component having a high MFR.
  • the relative position of the insulated wire at the time of forming the sheath in the communication wire can be changed.
  • the outer periphery of the insulated wires can be densely filled with the constituent material of the sheath while suppressing displacement and deformation. At the same time, heat deformation of the sheath can be suppressed in the manufactured communication wire.
  • the MFR within the above range can be easily achieved by mixing a high melting point polymer and a low melting point polymer.
  • HDPE is used as the low-melting polymer, but the results are not shown even when LDPE (melting point: 106.4°C, MFR: 15 g/10 min) is used as the low-melting polymer instead of HDPE. Although omitted, similar results were obtained.

Landscapes

  • Communication Cables (AREA)
  • Insulated Conductors (AREA)

Abstract

L'invention fournit un fil électrique pour communication qui possède une gaine de type pleine à la périphérie externe d'un fil de signal contenant une pluralité de fils électriques isolés, et dans lequel ni un décalage de position relative ni une déformation ne sont susceptibles de se produire au niveau des fils électriques isolés du fait d'une composition de résine en fusion, lors d'un moulage par extrusion de la gaine.　Plus précisément, l'invention concerne un fil électrique pour communication (1) qui possède : le fil de signal (10) contenant la pluralité de fils électriques isolés (11) possédant à son tour un conducteur (12), et un revêtement isolant (13) revêtant la périphérie externe dudit conducteur (12) ; et une gaine (20) de forme pleine revêtant la périphérie externe dudit fil de signal (10). La composition configurant ladite gaine (20) présente un indice de fluidité à chaud mesuré à 230°C et à une charge de ２,１６ｋｇ, supérieur ou égal à ０,８ｇ／１０ minutes et inférieur ou égal à ２,１ｇ／１０ minutes.
PCT/JP2022/009045 2021-03-24 2022-03-03 Fil électrique pour communication WO2022202174A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58224727A (ja) * 1982-06-24 1983-12-27 Sumitomo Electric Ind Ltd 発泡体の製造方法
JP2005538528A (ja) * 2002-09-10 2005-12-15 ユニオン・カーバイド・ケミカルズ・アンド・プラスティックス・テクノロジー・コーポレイション 溶融強度および物理特性が強化されたポリプロピレンケーブル被覆組成物
JP2011221252A (ja) * 2010-04-08 2011-11-04 Fujikura Ltd 光ファイバケーブル及び光ファイバケーブルの製造方法
WO2017168842A1 (fr) * 2016-03-31 2017-10-05 株式会社オートネットワーク技術研究所 Fil électrique de communication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58224727A (ja) * 1982-06-24 1983-12-27 Sumitomo Electric Ind Ltd 発泡体の製造方法
JP2005538528A (ja) * 2002-09-10 2005-12-15 ユニオン・カーバイド・ケミカルズ・アンド・プラスティックス・テクノロジー・コーポレイション 溶融強度および物理特性が強化されたポリプロピレンケーブル被覆組成物
JP2011221252A (ja) * 2010-04-08 2011-11-04 Fujikura Ltd 光ファイバケーブル及び光ファイバケーブルの製造方法
WO2017168842A1 (fr) * 2016-03-31 2017-10-05 株式会社オートネットワーク技術研究所 Fil électrique de communication

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