WO2011048974A1 - Fil électrique en mousse et câble de transmission le comprenant - Google Patents

Fil électrique en mousse et câble de transmission le comprenant Download PDF

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Publication number
WO2011048974A1
WO2011048974A1 PCT/JP2010/067847 JP2010067847W WO2011048974A1 WO 2011048974 A1 WO2011048974 A1 WO 2011048974A1 JP 2010067847 W JP2010067847 W JP 2010067847W WO 2011048974 A1 WO2011048974 A1 WO 2011048974A1
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Prior art keywords
foamed
electric wire
insulating layer
resin
foamed electric
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PCT/JP2010/067847
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English (en)
Japanese (ja)
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亮 渡部
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株式会社フジクラ
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Priority to JP2011537208A priority Critical patent/JPWO2011048974A1/ja
Publication of WO2011048974A1 publication Critical patent/WO2011048974A1/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
    • H01B13/14—Insulating conductors or cables by extrusion
    • H01B13/142—Insulating conductors or cables by extrusion of cellular material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/06—Rod-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/154—Coating solid articles, i.e. non-hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/06—Rods, e.g. connecting rods, rails, stakes

Definitions

  • the present invention relates to a foamed electric wire and a transmission cable having the same.
  • the foam insulation layer of foamed electric wires used for USB 3.0 cables, HDMI cables, Infiniband cables, micro USB cables, etc. has a small diameter, high heat resistance, and can be finely foamed. Is required.
  • an ethylene-propylene copolymer having a melt tension at break of 5.0 g (49 mN) or more and a melt mass flow rate at 190 ° C. of 2.16 kg of 1.0 g / 10 min or more is conventionally used.
  • a chemical foaming agent such as azodicarbonamide and a copper damage inhibitor such as 3- (N-salicyloyl) amino-1,2,4-triazole added to the coalesced foam. It has been proposed to stably and reliably form an insulating layer (Patent Document 1 below).
  • foamed cells may be coarsened, and sufficiently fine foamed cells may not be obtained.
  • the foamed insulating layer is required to have heat resistance, and it is desired that the foamed insulating layer can be used continuously for a long time even in a high temperature environment.
  • the present invention has been made in view of the above circumstances, and provides a foamed electric wire capable of obtaining a sufficiently fine foamed cell and capable of being continuously used over a long period of time even in a high temperature environment, and a transmission cable having the same. With the goal.
  • the present inventor conducted various experiments paying attention to the melt tension at the time of fracture of the base resin. At this time, the inventor considered that when the melt tension at the time of fracture was lower than the melt tension described in Patent Document 1, the amount of attenuation increased.
  • the inventor's research depending on the combination of the copper damage inhibitor added to the base resin containing the propylene resin and the chemical foaming agent, the coarsening of the foam cell is sufficiently suppressed, and the foam cell is sufficiently fine. It became clear that the amount of attenuation tends to be suppressed.
  • the above-mentioned specific copper damage inhibitor sufficiently suppresses the deterioration of the propylene-based resin by the conductor, which is considered to allow continuous use even in a high temperature environment.
  • the present invention is a foamed electric wire comprising a conductor and a foamed insulating layer covering the conductor, wherein the foamed insulating layer contains a propylene resin, has a melt tension at break of 20 to 55 mN, and a take-off speed.
  • a resin composition containing a base resin having a viscosity of 50 m / min or more, a chemical foaming agent, and a copper damage inhibitor, wherein the chemical foaming agent is azodicarbonamide,
  • the agent is 3- (N-salicyloyl) amino-1,2,4-triazole, 2 ′, 3-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyl] propionohydrazide
  • foamed electric wire sufficiently fine foamed cells can be obtained, and it can be used continuously for a long time even in a high temperature environment.
  • the resin composition further includes silica particles. In this case, even if the resin composition is continuously melted and kneaded for a long time, the decrease in the discharge amount can be sufficiently suppressed, and the production efficiency of the foamed electric wire can be more sufficiently improved.
  • the present invention is a transmission cable having the above foamed electric wire. According to this transmission cable, a sufficiently fine foam cell can be obtained, and it can be used continuously for a long time even in a high-temperature environment. Therefore, it is easy to obtain a transmission cable with reduced attenuation, and the length of the transmission cable is increased. Life can be extended.
  • melt tension at break refers to melt tension measured using a capillary rheometer (Capillograph 1D, manufactured by Toyo Seiki Seisakusho Co., Ltd.). Specifically, “melt tension at break” is defined as follows. That is, first, a base capillary is filled into a flat capillary having an inner diameter of 1.0 mm and a length of 10 mm. Thereafter, in the capillary rheometer, the piston speed is set to 5 mm / min, the barrel inner diameter is 9.55 mm, the take-up acceleration is set to 400 m / min 2 , and the temperature of the barrel, the capillary, and the thermostat immediately after the barrel is set to 200 ° C.
  • the base resin is filled in the barrel, and after 5 minutes preheating, piston extrusion is started at the piston speed. Then, the base resin is accelerated at the above-mentioned take-up acceleration and taken up, and the tension when it is broken is measured. The average value of the measured tension values obtained by performing this measurement 10 times is defined as “melt tension at break”.
  • a foamed electric wire that can obtain sufficiently fine foamed cells and can be used continuously for a long period of time even in a high-temperature environment, and a transmission cable having the same are provided.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is an end view which shows other embodiment of the transmission cable of this invention.
  • FIG. 1 is a partial side view showing an embodiment of a transmission cable according to the present invention, and shows an example in which a foamed electric wire is applied to a coaxial cable as a transmission cable.
  • FIG. 2 is a sectional view taken along line II-II in FIG.
  • the transmission cable 10 is a coaxial cable, and includes a foamed electric wire 5, an outer conductor 3 that surrounds the foamed electric wire 5, and a sheath 4 that covers the outer conductor 3.
  • the foamed electric wire 5 includes an inner conductor 1 and a foamed insulating layer 2 that covers the inner conductor 1.
  • the foam insulation layer 2 includes a base resin containing a propylene-based resin, a melt tension at break of 20 mN to 55 mN and a take-up speed of 50 m / min or more, a chemical foaming agent, and a copper damage preventing agent. It is obtained by melt-kneading the resin composition containing.
  • azodicarbonamide is used as the chemical foaming agent, and 3- (N-salicyloyl) amino-1,2,4-triazole, 2 ′, 3-bis [3- ( 3,5-di-tert-butyl-4-hydroxyphenyl) propionyl] propionohydrazide and decamethylenedicarboxylic acid disalicyloyl hydrazide are used.
  • the foamed electric wire 5 having such a configuration a sufficiently fine foam cell can be obtained, and it can be continuously used over a long period of time even in a high temperature environment. Therefore, according to the transmission cable 10 having the foamed electric wire 5, it becomes easy to obtain the transmission cable 10 in which the attenuation amount is suppressed, and the life of the transmission cable 10 can be extended.
  • the inner conductor 1 is prepared.
  • the internal conductor 1 include metal wires such as copper wires, copper alloy wires, and aluminum wires.
  • a material obtained by plating the surface of the metal wire with tin, silver or the like can be used as the internal conductor 1.
  • the inner conductor 1 can be a single wire or a stranded wire.
  • a base resin In order to form the foam insulation layer 2, a base resin, a chemical foaming agent, and a copper damage prevention agent are prepared.
  • Base resin Here, the base resin will be described first.
  • the base resin includes a propylene resin.
  • Propylene-type resin means resin containing the structural unit derived from propylene. Therefore, such propylene-based resins include homopolypropylene obtained by homopolymerization of propylene, copolymers of olefins other than propylene and propylene, and mixtures of two or more thereof. Examples of olefins other than propylene include ethylene, 1-butene, 2-butene, 1-hexene, 2-hexene and the like.
  • ⁇ -olefins such as ethylene, 1-butene, and 1-hexene are preferably used from the viewpoint of realizing more sufficient miniaturization of the foamed cell and obtaining better heat resistance, and more preferably ethylene. .
  • the propylene-based resin is a copolymer of olefin other than propylene and propylene
  • the copolymer includes a random copolymer in addition to the block copolymer, but the copolymer includes a block copolymer. It is preferable.
  • the copolymer contains a block copolymer, the foamed cells can be more sufficiently miniaturized and better heat resistance can be obtained as compared with the case where the block copolymer is not contained.
  • the copolymer may be composed only of a block copolymer, or may be composed of a mixture of a block copolymer and a random copolymer, but only composed of a block copolymer. Is preferred. In this case, compared with the case where a copolymer is comprised with the mixture of a block copolymer and a random copolymer, a foamed cell can be refined more fully.
  • the propylene resin preferably has a melting point of 150 ° C. or higher.
  • the heat resistance of the foamed electric wire 5 is further improved as compared with the case where the melting point is less than 150 ° C.
  • the melting point of the propylene-based resin is more preferably 160 ° C. or higher.
  • the melting point of the propylene-based resin is preferably 170 ° C. or lower because the good balance between heat resistance and resistance to low temperature embrittlement and bending resistance can be maintained.
  • the melt tension at break of the base resin is 20 to 55 mN.
  • the foam cell becomes coarse.
  • the take-off speed at the time of breaking of the base resin is 50 m / min or more, preferably 80 m / min or more, more preferably 100 m / min or more.
  • the take-up speed at the time of breaking is preferably 200 m / min or less for the reason that fine foam cells can be stably obtained, and more preferably 150 m / min or less.
  • ADCA azodicarbonamide
  • N 2 , NH 3 , and CO 2 a gas such as N 2 , NH 3 , and CO 2 by thermal decomposition
  • ADCA has a thermal decomposition temperature sufficiently higher than the melting point of the propylene-based resin and lower than the decomposition temperature of the propylene-based resin. Therefore, the degree of freedom of the temperature profile is high and the foaming is easily controlled. Further, when ADCA is used, sufficiently fine foam cells can be stably obtained as compared with the case of using a chemical foaming agent other than ADCA, and fluctuations in the outer diameter of the foamed insulating layer 2 can also be suppressed.
  • the chemical foaming agent is preferably added in an amount of 0.3 to 1 part by weight, more preferably 0.5 to 0.7 parts by weight, based on 100 parts by weight of the base resin.
  • the addition amount of the chemical foaming agent is within the above range, sufficiently fine foam cells can be obtained more stably.
  • the copper damage prevention agent is for preventing deterioration of the propylene-based resin due to contact with the inner conductor 1, and the copper damage prevention agent is 3- (N-salicyloyl) amino-1,2,4- Triazole, 2 ′, 3-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyl] propionohydrazide or decamethylenedicarboxylic acid disalicyloyl hydrazide is used. These can be used alone or in admixture of two or more.
  • 3- (N-salicyloyl) amino-1,2,4-triazole, 2 ′, 3-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyl] propionohydrazide This is preferable because finer foam cells can be obtained.
  • the copper damage inhibitor is preferably added in an amount of 0.01 to 1 part by weight, more preferably 0.1 to 1 part by weight, even more preferably 0.25 to 0.5 parts by weight, based on 100 parts by weight of the base resin. Add part.
  • the addition amount of the copper damage inhibitor is within the above range, deterioration due to heat aging is more sufficiently suppressed, and the life of the foamed electric wire 5 can be extended. In addition, an adverse effect on the signal attenuation can be reduced.
  • silica particles It is preferable to add silica particles to the base resin together with a copper damage inhibitor. In this case, even if the resin composition is continuously melted and kneaded for a long time, a decrease in the discharge amount can be sufficiently suppressed, and the production efficiency of the foamed electric wire 5 can be improved. As a result, the price of the foamed electric wire 5 can be reduced.
  • silica particles promote the coarsening of foamed cells when used together with a copper damage inhibitor.
  • the foaming cell is prevented from becoming coarse, and when the silica particles are combined with a copper damage inhibitor other than the specific copper damage inhibitor, It has been clarified by research of the present inventor that coarsening tends to be promoted.
  • the addition amount of silica particles is preferably 0.03 to 1 part by mass with respect to 100 parts by mass of the base resin.
  • the addition amount of the silica particles is within the above range, it is possible to more sufficiently suppress the decrease in the discharge amount from the extruder, and more sufficiently increase the signal attenuation in the foamed electric wire 5 due to the hygroscopic property of silica. It tends to be suppressed.
  • antioxidant It is preferable to add an antioxidant to the base resin. In this case, heat aging characteristics and the like are further improved, and the foamed electric wire 5 can be continuously used over a longer period even in a high temperature environment.
  • the amount of the antioxidant added to 100 parts by mass of the base resin is, for example, 0.05 to 1 part by mass.
  • antioxidants examples include 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-methylphenol, Monophenols such as 2,6-di-tert-butyl- ⁇ -dimethylamino-p-cresol, 2,4,6-tri-tert-butylphenol, o-tert-butylphenol, 2,2′- Methylene-bis- (4-methyl-6-tert-butylphenol), 2,2′-methylene-bis- (4-ethyl-6-tert-butylphenol), 4,4′-methylene-bis- (2 , 6-di-tert-butylphenol), 4,4′-butylidene-bis- (4-methyl-6-tert-butylphenol), alkylated bisphenol, 1,3,5-trimethyl-2,4,6 -Tris (3,5 Polyphenols such as di-tert-butyl-4-hydroxybenzyl) benz
  • the melt tension at the time of rupture of the base resin in the foamed insulating layer 2 is 30 mN or more because the foamed cells can be more sufficiently miniaturized, and more preferably 45 mN or more. preferable.
  • the melt tension is preferably 55 mN or less, more preferably 50 mN or less. Preferably, it is 48 mN or less.
  • the melt tension of the base resin at the time of breaking can be adjusted by adjusting the temperature at the die outlet of the extruder, for example.
  • the outer diameter of the foam insulation layer 2 is preferably less than 1.5 mm and more preferably 1.0 mm or less when the foamed electric wire 5 is used for a high-frequency cable.
  • the foamed insulating layer 2 preferably has a foaming degree of 30 to 60%. In this case, crushing (deformation) of the transmission cable 10 can be suppressed, and even if a foamed electric wire for a transmission cable used in a high frequency band is made of a foamed insulating layer 2 using a propylene resin, the foamed cell becomes coarse.
  • the foamed insulating layer 2 in a foamed state having fine and uniform foamed cells can be obtained.
  • the transmission cable 10 using the foamed electric wire 5 has a small outer diameter variation, and even if the foamed insulating layer 2 is thin, there is little problem of crushing, and variations such as deterioration of attenuation are sufficiently suppressed.
  • the foamed insulating layer 2 and the inner conductor 1 interpose a thin layer made of unfoamed resin, so-called inner layer, between the foamed insulating layer 2 and the inner conductor 1.
  • inner layer can also prevent deterioration (embrittlement) of the foamed insulating layer 2 due to copper in the inner conductor 1.
  • the thickness of the thin layer may be, for example, 0.01 to 0.1 mm.
  • the adhesiveness of the foam insulation layer 2 and the external conductor 3 can be improved.
  • the unfoamed resin is made of polyethylene
  • the adhesion between the foamed insulating layer 2 and the outer conductor 3 can be further improved.
  • the outer layer is interposed between the foamed insulating layer 2 and the outer conductor 3, the outer diameter fluctuation is reduced, and the skew and VSWR are improved.
  • crush resistance improves and the outer diameter of the foamed electric wire 5 can also be made small.
  • the thickness of the thin layer may be set to 0.02 to 0.05 mm, for example.
  • the outer conductor 3 is formed so as to surround the foamed electric wire 5 obtained as described above.
  • the external conductor 3 a known one that has been conventionally used can be used.
  • the external conductor 3 can be formed by winding a conductive wire or a tape formed by sandwiching a conductive sheet between resin sheets along the outer periphery of the insulating layer 2.
  • the outer conductor 3 can be constituted by a corrugated metal tube, that is, a corrugated metal tube. In this case, the flexibility of the foamed electric wire 5 can be improved.
  • the sheath 4 protects the outer conductor 3 from physical or chemical damage.
  • the material constituting the sheath 4 include resins such as fluororesin, polyethylene, and polyvinyl chloride. From the viewpoint of the above, a halogen-free material such as polyethylene resin is preferably used.
  • the transmission cable 10 is obtained as described above.
  • FIG. 3 is an end view showing a Twinax type transmission cable having the foamed electric wire 5.
  • the Twinax type transmission cable 20 is a laminate layer composed of two foamed electric wires 5, a drain wire 6, a laminate tape 7, two power lines 8, an aluminum tape layer and a braided layer. 9 and a sheath 4.
  • the two foamed electric wires 5 are arranged in parallel to each other, and these are used as signal lines.
  • the laminate tape 7 is wound around the foamed electric wire 5 and the drain wire 6, and the sheath 4 is formed on the laminate layer 9 so as to surround the laminate layer 9.
  • the laminate tape 7 is composed of a laminate of, for example, an aluminum foil and a polyethylene terephthalate film, and the sheath 4 is composed of, for example, an olefin-based non-halo material such as ANA 9897N manufactured by Riken Technos.
  • the foamed electric wire 5 and the foamed insulating layer 2 are the same as those in the above embodiment.
  • the present invention is not limited to the above embodiment.
  • an example in which the foamed electric wire 5 is applied to a coaxial cable or a Twinax type transmission cable as a transmission cable is shown.
  • the foamed electric wire 5 is a USB 3.0 cable, an HDMI cable, Infiniband. It can also be applied to high-speed transmission cables such as cables and micro USB cables.
  • Example 1 First, FB3312 (trade name, manufactured by Nippon Polypro Co., Ltd., hereinafter referred to as “EP1”), which is an ethylene-propylene block copolymer, was prepared as a base resin.
  • EP1 ethylene-propylene block copolymer
  • EP1 in an extruder product name: Laboplast Mill D2020, screw diameter (D): ⁇ 20 mm, effective screw length (L): 400 mm, manufactured by Toyo Seiki Seisakusho Co., Ltd.
  • copper damage inhibitor and chemical foaming shown in Table 1
  • the agent was added and melt-kneaded to perform extrusion molding.
  • a copper damage inhibitor and a chemical foaming agent were added in amounts shown in Table 1 to 100 parts by mass of EP1.
  • the unit of blending amount is parts by mass.
  • the temperature of the extruder was set to 200 to 220 ° C., so that ADCA was thermally decomposed while melting the base resin.
  • the extrudate was extruded from the extruder into a tube shape, and the twisted wire conductor in which seven copper wires having a diameter of 0.127 mm were twisted was covered with the tube-like extrudate.
  • a foamed electric wire composed of a stranded wire conductor and a foamed insulating layer covering the stranded wire conductor was produced.
  • the extrudate was extruded so that the foamed insulating layer had an outer diameter of 0.92 mm and a thickness of 0.3 mm.
  • Two foamed electric wires thus obtained were arranged in parallel, and these were wound together with a drain wire and a laminate tape having a thickness of 22 ⁇ m made of a laminate of an aluminum layer and a polyethylene terephthalate layer.
  • this was wound with an aluminum tape layer having a thickness of 25 ⁇ m together with two power lines having an outer diameter of 0.8 mm, and then covered with a braided layer, and further olefin-based non-halo material ANA9897N (trade name, manufactured by Riken Technos) Covered with a sheath consisting of In this way, a Twinax type transmission cable was produced.
  • Example 2 to 52 and Comparative Examples 1 to 11 Type of base resin, type and amount of copper damage preventive agent, silica content, type of chemical foaming agent and amount thereof, melt tension and take-off speed when base resin breaks, transmission cable impedance, foam insulation layer A twinax type transmission cable was prepared in the same manner as in Example 1 except that the outer diameter of each and the foaming degree in the foamed insulating layer were as shown in Tables 1, 3 and 5. In Tables 1, 3, and 5, the unit of the blending amount is parts by mass.
  • Base resin (1-1)
  • EP1 FB3312 Nippon Polypro Co., Ltd.
  • ethylene / propylene copolymer 1-2
  • EP2 FB5100 Nippon Polypro Co., Ltd.
  • melt tension and take-off speed at break were measured for the foamed electric wires obtained in Examples 1 to 52 and Comparative Examples 1 to 11 as follows.
  • melt tension and take-up speed were measured using a capillary rheometer (Capillograph 1D, manufactured by Toyo Seiki Seisakusho Co., Ltd.). Specifically, the melt tension and the take-up speed were measured as follows. First, a base resin was filled into a flat capillary having an inner diameter of 1.0 mm and a length of 10 mm. Thereafter, in the capillary rheometer, the piston speed was set to 5 mm / min, the barrel inner diameter was set to 9.55 mm, the take-up acceleration was set to 400 m / min 2 , and the temperatures of the barrel, the capillary, and the thermostat immediately after the barrel were set to 200 ° C.
  • a capillary rheometer Capillograph 1D, manufactured by Toyo Seiki Seisakusho Co., Ltd.
  • Attenuation amount With respect to the transmission cables obtained in Examples 1 to 52 and Comparative Examples 1 to 11, using a network analyzer (manufactured by 8722ES Agilent Technologies), a frequency signal of 1.25 GHz and a signal of 2.5 GHz The attenuation was measured for each of the above. Next, these transmission cables were left in an atmosphere of 85 ° C. and 90% RH for 1000 hours, and then the signal attenuation was measured in the same manner as before. The ratio of the attenuation amount of the signal after being left to the attenuation amount of the signal before being left is expressed by the following formula: Calculated based on The results are shown in Tables 2, 4 and 6.
  • Examples 1 to 52 and Comparative Examples 1 to 11 are indicated by any one of A to C based on the following criteria.
  • Discharge rate reduction rate The resin composition was continuously fed into an extruder (product name: Laboplast mill D2020, screw diameter (D): ⁇ 20 mm, effective screw length (L): 400 mm, manufactured by Toyo Seiki Seisakusho). Then, the extrusion molding is continued, and the discharge amount of the extrudate after 10 hours has elapsed after being charged into the extruder (hereinafter referred to as “initial discharge amount”), and the discharge amount of the extrudate after another one hour has passed. From the following formula, the rate of decrease in the discharge amount of the extrudate is: Calculated based on The results are shown in Tables 2, 4 and 6.
  • Example 1 to 52 and Comparative Examples 1 to 11 are indicated by any one of A to D based on the following criteria.
  • a ... Reduction rate is less than 0.2%
  • B ... Reduction rate is 0.2% or more and less than 0.5%
  • C ... Reduction rate is 0.5% or more and less than 1.0%
  • D ... Reduction rate is 1.0% or more
  • Examples 1 to 52 and Comparative Examples 1 to 11 were over 2.5 years in terms of heat aging deterioration, and passed the acceptance criteria.
  • the foamed electric wires of Examples 1 to 52 had a foamed insulating layer having an average foamed cell diameter of less than 50 ⁇ m and a standard deviation of less than 25 ⁇ m, and all of them reached the acceptance standard.
  • the foamed electric wires of Comparative Examples 1 to 11 have a foam insulation layer with an average cell diameter of 50 ⁇ m and a standard deviation of 25 ⁇ m, and both the average foam cell diameter and the standard deviation have reached the acceptance criteria. There wasn't.
  • the foamed electric wire of the present invention it was confirmed that a sufficiently fine foamed cell can be obtained and can be continuously used for a long time even in a high temperature environment.
  • SYMBOLS 1 Internal conductor (conductor), 2 ... Foam insulation layer, 5 ... Foam electric wire, 10, 20 ... Transmission cable.

Abstract

L'invention concerne un fil électrique en mousse comprenant un conducteur électrique et une couche d'isolation en mousse qui recouvre le conducteur, la couche d'isolation en mousse étant obtenue par malaxage à l'état fondu d'un mélange de résine comprenant une résine de base contenant une résine à base de propylène et ayant une résistance à l'état fondu de 20-55 mN et une vitesse de tirage supérieure ou égale à 50 m/min à la rupture, un agent moussant chimique et un inhibiteur de corrosion du cuivre, de telle sorte que l'agent moussant chimique est l'azodicarbonamide et l'inhibiteur de corrosion du cuivre est d'au moins un type choisi dans le groupe consistant en le 3-(N-salicyloyl) amino-1,2,4-triazole, le 2',3-bis[3-(3,5-di-tert-butyl-4-hydroxyphényl)propionyl] propionohydrazide et le décaméthylène dicarboxylique di-salicyloyl hydrazide.
PCT/JP2010/067847 2009-10-23 2010-10-12 Fil électrique en mousse et câble de transmission le comprenant WO2011048974A1 (fr)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN103554652A (zh) * 2013-09-11 2014-02-05 浙江世博新材料有限公司 一种含氨基羧酸型有机无机复配抗铜剂聚丙烯复合材料及其制备方法
JP2019110021A (ja) * 2017-12-18 2019-07-04 日立金属株式会社 絶縁電線およびケーブル
JP2021012773A (ja) * 2019-07-04 2021-02-04 矢崎エナジーシステム株式会社 電線またはケーブル
JP2021106131A (ja) * 2019-12-26 2021-07-26 住友電気工業株式会社 電気絶縁ケーブル

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JP2003208823A (ja) * 2002-01-10 2003-07-25 Fujikura Ltd 高周波同軸ケーブル
JP2006286619A (ja) * 2005-03-08 2006-10-19 Fujikura Ltd 細径発泡同軸ケーブル
JP2007237645A (ja) * 2006-03-10 2007-09-20 Fujikura Ltd 発泡成形方法、発泡同軸ケーブル及び発泡同軸ケーブルの製造方法
JP2008500702A (ja) * 2004-05-26 2008-01-10 ダウ グローバル テクノロジーズ インコーポレイティド 発泡絶縁体を有する同軸ケーブル

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JPS6467832A (en) * 1987-09-09 1989-03-14 Hitachi Cable Manufacture of foaming plastic-insulated electric wire
JP2001312925A (ja) * 2000-02-22 2001-11-09 Kyowa Chem Ind Co Ltd 耐熱劣化性耐水絶縁性難燃性絶縁電線およびケーブル
JP2003105179A (ja) * 2001-09-28 2003-04-09 Kanebo Ltd 難燃性樹脂組成物および電線
JP2003208823A (ja) * 2002-01-10 2003-07-25 Fujikura Ltd 高周波同軸ケーブル
JP2008500702A (ja) * 2004-05-26 2008-01-10 ダウ グローバル テクノロジーズ インコーポレイティド 発泡絶縁体を有する同軸ケーブル
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JP2007237645A (ja) * 2006-03-10 2007-09-20 Fujikura Ltd 発泡成形方法、発泡同軸ケーブル及び発泡同軸ケーブルの製造方法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103554652A (zh) * 2013-09-11 2014-02-05 浙江世博新材料有限公司 一种含氨基羧酸型有机无机复配抗铜剂聚丙烯复合材料及其制备方法
CN103554652B (zh) * 2013-09-11 2015-08-12 浙江世博新材料有限公司 一种含氨基羧酸型有机无机复配抗铜剂聚丙烯复合材料及其制备方法
JP2019110021A (ja) * 2017-12-18 2019-07-04 日立金属株式会社 絶縁電線およびケーブル
JP7045638B2 (ja) 2017-12-18 2022-04-01 日立金属株式会社 絶縁電線およびケーブル
JP2021012773A (ja) * 2019-07-04 2021-02-04 矢崎エナジーシステム株式会社 電線またはケーブル
JP2021106131A (ja) * 2019-12-26 2021-07-26 住友電気工業株式会社 電気絶縁ケーブル
JP7443766B2 (ja) 2019-12-26 2024-03-06 住友電気工業株式会社 電気絶縁ケーブル

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