WO2022113900A1 - 絶縁電線及び情報伝送用ケーブル - Google Patents
絶縁電線及び情報伝送用ケーブル Download PDFInfo
- Publication number
- WO2022113900A1 WO2022113900A1 PCT/JP2021/042575 JP2021042575W WO2022113900A1 WO 2022113900 A1 WO2022113900 A1 WO 2022113900A1 JP 2021042575 W JP2021042575 W JP 2021042575W WO 2022113900 A1 WO2022113900 A1 WO 2022113900A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antioxidant
- insulated wire
- insulating layer
- mass
- sulfur
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/22—Compounds containing nitrogen bound to another nitrogen atom
- C08K5/24—Derivatives of hydrazine
- C08K5/25—Carboxylic acid hydrazides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/37—Thiols
- C08K5/372—Sulfides, e.g. R-(S)x-R'
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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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
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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
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
- H01B11/10—Screens specially adapted for reducing interference from external sources
- H01B11/1091—Screens specially adapted for reducing interference from external sources with screen grounding means, e.g. drain wires
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
Definitions
- transmission loss transmission loss
- the dielectric positive connection of the insulating layer is reduced and the transmission loss is transmitted. It is necessary to further reduce the signal transmission in a stable manner.
- the insulated wire according to one aspect of the present disclosure includes one or a plurality of linear conductors and one or a plurality of insulating layers laminated on the outer peripheral surface of the conductor, and the insulating layer is an olefin resin and antioxidant.
- the content of the antioxidant is more than 1.0 part by mass and 5.0 parts by mass or less with respect to 100 parts by mass of the olefin resin, and the antioxidant is a phenolic antioxidant. It is composed of sulfur-based antioxidants excluding sulfur-containing phenolic antioxidants.
- FIG. 1 is a schematic cross-sectional view of an insulated wire according to an embodiment of the present disclosure.
- FIG. 2 is a schematic cross-sectional view of the Twinax cable according to the embodiment of the present disclosure.
- FIG. 3 is a schematic perspective view of a coaxial cable according to an embodiment of the present disclosure.
- FIG. 4 is a schematic cross-sectional view of the coaxial cable of FIG.
- the dielectric loss tangent may increase.
- the influence of the dielectric loss tangent on the signal attenuation is large as a transmission line.
- an insulating material used for an in-vehicle information wire or the like it is desired to improve heat resistance while maintaining electrical characteristics.
- the present disclosure has been made based on such circumstances, and an object of the present invention is to suppress an increase in the dielectric loss tangent of the insulating layer and to provide an insulated wire having excellent heat resistance.
- the insulated wire according to one aspect of the present disclosure includes one or a plurality of linear conductors and one or a plurality of insulating layers laminated on the outer peripheral surface of the conductor, and the insulating layer is an olefin resin and antioxidant.
- the content of the antioxidant is more than 1.0 part by mass and 5.0 parts by mass or less with respect to 100 parts by mass of the olefin resin, and the antioxidant is a phenolic antioxidant. It is composed of sulfur-based antioxidants excluding sulfur-containing phenolic antioxidants.
- the insulating wire contains an olefin resin having a low polarity in the insulating layer, so that the dielectric loss tangent can be satisfactorily reduced.
- the insulating layer contains an antioxidant composed of a phenol-based antioxidant and a sulfur-based antioxidant excluding a sulfur-containing phenol-based antioxidant, and the content of the antioxidant is within the above range. Therefore, it is possible to improve the heat resistance of the insulating layer, which is the durability in a high temperature environment, while suppressing the deterioration of the olefin resin due to heat and the increase of the dielectric tangent. Therefore, the insulated wire suppresses an increase in the dielectric loss tangent of the insulating layer and has excellent heat resistance.
- the mass ratio of the phenolic antioxidant to the sulfur-based antioxidant may be 4: 1 to 1: 4.
- the heat resistance can be further improved.
- the above-mentioned phenolic antioxidant may have a less hindered phenol structure represented by the following formula (1) or a semi-hindered phenol structure represented by the following formula (2).
- R 1 to R 4 are methyl groups.
- R 5 is a substituent.
- the phenolic antioxidant has a less hindered phenol structure represented by the above formula (1) or a semi-hindered phenol structure represented by the above formula (2), the effect of reducing the dielectric loss tangent of the insulating layer and the effect of reducing the dielectric loss tangent are obtained.
- the heat resistance can be further improved.
- the sulfur-based antioxidant may be represented by the following formula (3) or the following formula (4). (In the formulas (3) and (4), X 1 is -S- or -NH-, and R 6 is an alkyl group.)
- the heat resistance can be further improved by containing the sulfur-based antioxidant represented by the above formula (3) or the above formula (4) in the insulated wire.
- the olefin resin may be polypropylene.
- the olefin resin is polypropylene, the effect of reducing the dielectric loss tangent of the insulating layer can be further improved.
- the insulating layer may further contain a metal damage inhibitor.
- metal damage can be suppressed and oxidative deterioration of the olefin resin can be suppressed. Therefore, the dielectric loss tangent of the insulating layer can be further reduced.
- metal damage generally means that oxidative deterioration of a material is promoted by the catalytic action of a metal in contact with the metal.
- the dielectric loss tangent of the insulating layer when a high frequency electric field having a frequency of 10 GHz is applied may be 4.2 ⁇ 10 -4 or less.
- the dielectric loss tangent of the insulating layer is within the above range when a high frequency electric field having a frequency of 10 GHz is applied, the effect of reducing transmission loss can be sufficiently improved.
- Another aspect of the present disclosure is an information transmission cable including one or more of the insulated wires.
- the information transmission cable includes the insulated wire, it suppresses an increase in the dielectric loss tangent of the insulating layer and has excellent heat resistance. Therefore, the information transmission cable can improve durability and reduce transmission loss in a high temperature environment.
- the insulated wire includes one or a plurality of linear conductors and one or a plurality of insulating layers laminated on the outer peripheral surface of the conductor.
- FIG. 1 is a schematic cross-sectional view of an insulated wire according to an embodiment of the present disclosure. As shown in FIG. 1, the insulated wire 1 includes a linear conductor 2 and a single insulating layer 3 laminated on the outer peripheral surface of the conductor 2.
- the conductor 2 is, for example, a circular wire having a circular cross section, but may be a square wire having a square cross section, a flat wire having a rectangular cross section, or a stranded wire obtained by twisting a plurality of strands.
- a metal having high conductivity and high mechanical strength is preferable.
- metals include copper, copper alloys, aluminum, aluminum alloys, nickel, silver, soft iron, steel, stainless steel and the like.
- the conductor 2 is a material obtained by forming these metals in a linear shape, or a material having a multilayer structure in which such a linear material is coated with another metal, for example, nickel-coated copper wire, silver-coated copper wire, or copper-coated aluminum. Wires, copper-coated steel wires and the like can be used.
- the lower limit of the average cross-sectional area of the conductor 2 0.01 mm 2 is preferable, and 0.1 mm 2 is more preferable.
- the upper limit of the average cross-sectional area of the conductor 2 10 mm 2 is preferable, and 5 mm 2 is more preferable. If the average cross-sectional area of the conductor 2 is less than 0.01 mm 2 , the volume of the insulating layer 3 with respect to the conductor 2 may increase, and the volumetric efficiency of the coil or the like formed by using the insulated wire may decrease.
- the "average cross-sectional area" of the conductor means a value obtained by measuring the cross-sectional area of 10 conductors at an arbitrary position and averaging them.
- the insulating layer 3 is formed on the outer peripheral surface of the conductor 2.
- the insulating layer 3 contains an olefin resin and an antioxidant.
- the insulating layer 3 contains an olefin resin having a low polarity, so that the dielectric loss tangent can be satisfactorily reduced.
- the olefin-based resin include polypropylene, polypropylene-based thermoplastic elastomer, reactor-type polypropylene-based thermoplastic elastomer, dynamically cross-linked polypropylene-based thermoplastic elastomer, polyethylene (high-density polyethylene (HDPE), linear low-density polyethylene (linear low-density polyethylene) ( LLDPE), low density polyethylene (LDPE), ultra low density polyethylene (VLDPE)), ethylene-propylene copolymer, polymethylpentene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacryl Methyl acid acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl methacrylate copolymer,
- High density polyethylene refers to polyethylene having a density of 0.942 g / cm 3 or more.
- Linear low density polyethylene (LLDPE) refers to polyethylene having a density of 0.910 g / cm 3 or more and less than 0.930 g / cm 3 and obtained by copolymerizing ethylene and ⁇ -olefin. ..
- Low density polyethylene refers to polyethylene having a density of 0.910 g / cm 3 or more and less than 0.930 g / cm 3 and obtained by polymerizing ethylene by a high-pressure polymerization method.
- VLDPE Ultra low density polyethylene
- polymethylpentene include homopolymers of 4-methyl-1-pentene and copolymers of 4-methyl-1-pentene and 3-methyl-1-pentene or other ⁇ -olefins. ..
- ⁇ -olefin examples include propylene, butene, pentene, hexene, heptene, octene, vinyl acetate, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate and the like.
- polypropylene is preferable as the olefin resin, and polypropylene having a melting point of 140 ° C. or higher is more preferable.
- polypropylene include homopolypropylene, random polypropylene, block polypropylene and the like.
- Homopolypropylene is a homopolymer of propylene.
- the random polypropylene include a copolymer of propylene and ethylene or an ⁇ -olefin having 4 to 20 carbon atoms.
- Block polypropylene is a resin composed of homopolypropylene as a main component, a random copolymer elastomer as a copolymer component, and an ethylene polymer as an optional component.
- block polypropylene or homopolypropylene is more preferable in terms of mechanical strength.
- the olefin resin is such polypropylene, the effect of reducing the dielectric loss tangent of the insulating layer and the heat resistance can be further improved.
- the "main component” means the component having the highest content.
- the lower limit of the content of the olefin resin in the insulating layer 3 is preferably 95.0% by mass, more preferably 98.0% by mass. If the content of the olefin resin is less than 95.0% by mass, it may be difficult to satisfactorily reduce the dielectric loss tangent of the insulating layer.
- the upper limit of the content of the olefin resin is preferably 99.9% by mass, more preferably 99.5% by mass. If the content of the olefin resin exceeds 99.9% by mass, the content of the antioxidant or the like in the insulating layer becomes insufficient, and the effect of improving the heat resistance in the insulating layer may not be sufficiently enhanced. ..
- the insulating layer 3 may contain a resin other than the olefin resin.
- a resin other than the olefin resin for example, polytetrafluoroethylene, acrylic resin, fluororubber, or the like may be added as a processability improver in the range of 0.1% by mass or more and 5.0% by mass or less.
- the antioxidant is for preventing the oxidation of the insulating layer 3.
- the above-mentioned antioxidant is composed of a phenol-based antioxidant and a sulfur-based antioxidant excluding a sulfur-containing phenol-based antioxidant.
- the insulated wire contains an olefin resin that is easily oxidatively deteriorated.
- the antioxidant is composed of a phenolic antioxidant and a sulfur-based antioxidant excluding a sulfur-containing phenolic antioxidant. , The heat resistance of the insulating layer 3 can be further improved.
- the mass ratio of the phenolic antioxidant to the sulfur-based antioxidant is 4: 1 to 1: 4.
- the mass ratio of the phenol-based antioxidant and the sulfur-based antioxidant is in the above range, the heat resistance can be further improved.
- the above-mentioned phenolic antioxidant has a less hindered phenol structure represented by the following formula (1) or a semi-hindered phenol structure represented by the following formula (2). Since the above-mentioned phenolic antioxidant has a less hindered phenol structure represented by the following formula (1) or a semi-hindered phenol structure represented by the following formula (2), the effect of reducing the dielectric loss tangent of the insulating layer and the effect of reducing the dielectric loss tangent are obtained. The heat resistance can be further improved.
- R 1 to R 4 are methyl groups.
- R 5 is a substituent.
- antioxidant having a semi-hindered phenol structure examples include 3,9-bis [2- ⁇ 3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy ⁇ -1. , 1-Dimethylethyl] -2,4,8,10-Tetraoxaspiro [5,5] Undecane (for example, Sumitomo Chemical Co., Ltd. Sumilizer GA-80, Adeca Co., Ltd.
- Adecastab AO-80 etc.
- Ethylenebis (Oxy) Ethylene) bis [3- (5-tert-butyl-hydroxy-m-tolyl) propionate] for example, Irganox 245 manufactured by BASF Japan Ltd.
- triethylene glycol bis [3- (3-tert-butyl-4-) (Hydroxy-5-methylphenyl) propionate] for example, Adecastab AO-70 manufactured by Adeca).
- antioxidant having a less hindered phenol structure examples include 4,4'-thiobis (6-tert-butyl-m-cresol) (for example, Sumirizer WX-R manufactured by Sumitomo Chemical Co., Ltd.), 4, 4'-butylidenebis (3-methyl-6-tert-butylphenol) (for example, Nocrack NS-30 manufactured by Ouchi Shinko Kagaku Kogyo, Adecastab AO-40 manufactured by Adeca, etc.), 4,4'-thiobis (3-methyl) -6-tert-butyl) Phenol (eg, Nocrack 300, manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd.), 1,1,3-Tris- (2-methyl-4-hydroxy-5-tert-butylphenyl) butane (eg, 2-methyl-4-hydroxy-5-tert-butylphenyl) butane (eg, Adecastab AO-30) manufactured by Adeca, bis [3,3-thiobi
- the sulfur-based antioxidant is preferably represented by the following formula (3) or the following formula (4).
- the heat resistance can be further improved by containing the sulfur-based antioxidant represented by the following formula (3) or the following formula (4) in the insulated wire.
- X 1 is -S- or -NH-
- R 6 is an alkyl group.
- sulfur-based antioxidant represented by the above formula (3) examples include 2-mercaptobenzothiazole (for example, Sunseller M manufactured by Sanshin Chemical Co., Ltd.) and 2-mercaptobenzimidazole (for example, Sumitomo Chemical Co., Ltd. Sumilyzer MB). Can be mentioned.
- sulfur-based antioxidant represented by the above formula (4) examples include distearyl thiodipropionate (Irganox PS802FL manufactured by BASF) and pentaerythritol tetrakis- (3-dodecylthiopropionate) (manufactured by Cipro Kasei Co., Ltd.). Seanox 412s), Zidodecylthiodipropionate (Sipro Kasei Co., Ltd. Seanox DL), Ditetradecylthiodipropionate (Cipro Kasei Co., Ltd. Seanox DM), Dioctadecylthiodipropionate (Cipro Kasei Co., Ltd. Sea) Knox DS) and the like.
- Distearyl thiodipropionate Irganox PS802FL manufactured by BASF
- pentaerythritol tetrakis- (3-dodecylthiopropionate)
- 2-mercaptobenzothiazole and pentaerythritol tetrakis- (3-dodecylthiopropionate) are from the viewpoint of further improving the effect of reducing the dielectric loss tangent of the insulating layer and the heat resistance. preferable.
- the lower limit of the content of the antioxidant in the insulating layer is more than 1.0 part by mass, preferably 2.0 parts by mass, and more preferably 4.0 parts by mass with respect to 100 parts by mass of the olefin resin. .. If the content of the antioxidant is 1.0 part by mass or less, it may be difficult to improve the effect of suppressing the deterioration of the olefin resin due to heat and the increase of the dielectric loss tangent.
- the upper limit of the content of the antioxidant is 5.0 parts by mass, preferably 4.9 parts by mass, and more preferably 4.8 parts by mass with respect to 100 parts by mass of the olefin resin. If the content of the antioxidant exceeds 5.0 parts by mass, the effect of suppressing the increase in dielectric loss tangent is reduced, and the electrical characteristics of the insulated wire may be impaired.
- the insulating layer further contains a metal damage inhibitor.
- the metal damage inhibitor stabilizes metal ions by chelate formation and suppresses deterioration of the dressing resin due to metal ions, so-called metal damage.
- metal damage can be suppressed and oxidative deterioration of the olefin resin can be suppressed. Therefore, the dielectric loss tangent of the insulating layer can be further reduced.
- the metal damage inhibitor in the present embodiment is preferably a copper damage inhibitor.
- the lower limit of the melting point of the metal damage inhibitor is 200 ° C, more preferably 220 ° C.
- the effect of reducing the dielectric loss tangent of the insulating layer and the effect of suppressing metal damage can be improved.
- the metal damage inhibitor is not particularly limited, and examples thereof include salicylic acid derivatives, phthalic acid derivatives, triazole-based compound complexes, aromatic secondary amine-based compounds, and the like.
- examples of the salicylic acid derivative include NN'-bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionyl] hydrazine (product name: Irganox MD1024, melting point 60 ° C.
- 3 -(N-Salicyloyl) amino-1,2,4-triazole product name: Adecastab CDA-1, melting point 315 ° C to 325 ° C
- decamethylene dicarboxylate disalicyloyl hydrazide product name: Adecastab CDA-6, Melting point 209 ° C to 215 ° C
- phthalic acid derivative examples include isophthalic acid bis (2-phenoxypropionylhydrazide) (product name: CUNOX, melting point 225 ° C.) and the like.
- Examples of the complex of the triazole-based compound include a complex containing 2-hydroxy-N-1H-1,2,4-triazole-3-ylbenzamide as a main component (product name: Adecaster CDA-1M, melting point 214 ° C.). Above) and the like.
- Examples of the aromatic secondary amine compound include N, N'-di-2-naphthyl-p-phenylenediamine (product name: Nocrack White, melting point 225 ° C. or higher) and the like.
- salicylic acid derivative, phthalic acid derivative or a combination thereof is preferable from the viewpoint of further improving the effect of suppressing metal damage, and 3- (N-salicyloyl) amino-1,2,4-triazole and bisisophthalate are preferable.
- 3- (N-salicyloyl) amino-1,2,4-triazole and bisisophthalate are preferable.
- (2-Phenoxypropionylhydrazide) is more preferred.
- the above-mentioned metal damage inhibitor may be used alone or in combination of two or more.
- the lower limit of the content of the metal damage inhibitor with respect to 100 parts by mass of the olefin resin is preferably 0.05 parts by mass, more preferably 0.2 parts by mass, and even more preferably 0.5 parts by mass. If the mass ratio of the metal damage inhibitor is less than 0.05 parts by mass, it may be difficult to improve the effect of suppressing metal damage. On the other hand, as the upper limit of the mass ratio of the metal damage inhibitor, 2.0 parts by mass is preferable, and 1.0 part by mass is more preferable. If the mass ratio of the metal damage inhibitor exceeds 2.0 parts by mass, the additive in the insulating layer precipitates on the surface from the resin and crystallizes, which is called bloom, which may impair the quality of the insulating layer. There is.
- the insulating layer may contain, for example, a flame retardant, a flame retardant, a pigment, an antioxidant and the like.
- the flame retardant imparts flame retardancy to the insulating layer.
- the flame retardant include halogen-based flame retardants such as chlorine-based flame retardants and brominated flame retardants.
- the flame retardant aid further improves the flame retardancy of the insulating layer.
- Examples of the flame retardant aid include antimony trioxide and the like.
- the pigment colors the insulating layer.
- various known pigments can be used, and examples thereof include titanium oxide and the like.
- the dielectric loss tangent of the insulating layer As the upper limit of the dielectric loss tangent of the insulating layer when a high frequency electric field having a frequency of 10 GHz is applied, 4.2 ⁇ 10 -4 is preferable, 3.0 ⁇ 10 -4 is more preferable, and 2.0 ⁇ 10 -4 is more preferable. More preferred.
- the dielectric loss tangent of the insulating layer is 4.2 ⁇ 10 -4 or less, the effect of reducing transmission loss can be sufficiently improved.
- the upper limit of the relative permittivity of the insulating layer is preferably 2.5, more preferably 2.3. If the relative permittivity exceeds 2.5, the transmission loss may not be sufficiently reduced and a sufficient transmission speed may not be obtained.
- dielectric loss tangent and “relative permittivity” are values measured according to a method according to JIS-R1641 (2007), respectively.
- the lower limit of the average thickness of the insulating layer 3 is preferably 50 ⁇ m, more preferably 100 ⁇ m.
- the upper limit of the average thickness of the insulating layer 3 is preferably 1500 ⁇ m, more preferably 1000 ⁇ m. If the average thickness of the insulating layer 3 is less than 50 ⁇ m, the insulating property may deteriorate. On the contrary, when the average thickness of the insulating layer 3 exceeds 1500 ⁇ m, the volumetric efficiency of the cable or the like formed by using the insulated wire may be lowered.
- the "average thickness" of the insulating layer means a value obtained by measuring the thickness of the insulating layer at an arbitrary position at 10 points and averaging the thickness.
- the insulating layer 3 is formed by extrusion molding.
- This method for manufacturing an insulated wire includes a step (extrusion step) of extruding and covering the outer peripheral surface of the conductor 2 with a resin composition for forming an insulating layer. Since the structure of the resin composition for forming the insulating layer is the same as that of the insulating layer described above, the description thereof will be omitted.
- the insulated wire suppresses an increase in the dielectric loss tangent of the insulating layer and has excellent heat resistance.
- the information transmission cable includes one or more of the insulated wires.
- Examples of the information transmission cable include a differential transmission cable and a coaxial cable.
- the differential transmission cable is preferably used as a cable for transmitting a differential signal in a field where high-speed communication is required.
- Examples of the cable for differential transmission include a Tinax cable having a Tinax structure.
- FIG. 2 is a schematic cross-sectional view of a Tynax cable, which is an embodiment of the information transmission cable.
- the twinax cable 10 has a twinax structure having a pair of insulated wires each consisting of a first insulated wire 1a and a second insulated wire 1b.
- the first insulated wire 1a includes a linear conductor 2a and a single insulating layer 3a laminated on the outer peripheral surface of the conductor 2a.
- the second insulated wire 1b includes a linear conductor 2b and a single insulating layer 3b laminated on the outer peripheral surface of the conductor 2b.
- the insulated wire is used for the first insulated wire 1a and the second insulated wire 1b.
- the twinax cable 10 includes a train wire 5 which is a third conductor, and a shield tape 30 arranged so as to cover the insulated wire 1a, the insulated wire 1b, and the train wire 5.
- the shield tape 30 is provided with a conductive layer on one side of an insulating film made of a resin such as a polyvinyl chloride resin or a flame-retardant polyolefin resin.
- a tape-like body such as a copper-deposited PET tape can be used.
- the shield tape 30 is arranged so as to cover the outer peripheral side of the insulating layers 3a and 3b.
- the shield tape 30 wraps the first insulated wire 1a, the second insulated wire 1b, and the train wire 5 so as to relatively fix the positional relationship between the first insulated wire 1a and the second insulated wire 1b. Is arranged on the outer peripheral side of the first insulating layer 3a and the second insulating layer 3b.
- the method for manufacturing a twinax cable which is an embodiment of the information transmission cable, is, for example, to bundle a first insulated wire and a second insulated wire, arrange a train wire as a third conductor, and arrange the train wire.
- a twinax cable is manufactured by wrapping a shield tape around the outer circumference.
- a coaxial cable according to an embodiment of the information transmission cable includes the above-mentioned insulated wire, an outer conductor covering the peripheral surface of the insulated wire, and an outer cover layer covering the peripheral surface of the outer conductor.
- the insulated wire includes one conductor and one insulating layer covering the peripheral surface of the conductor.
- the coaxial cable 40 of FIGS. 3 and 4 includes the insulated wire 1 provided with the conductor 2 and the insulating layer 3 covering the peripheral surface of the conductor 2, the external conductor 45 covering the peripheral surface of the insulated wire 1, and the outside.
- the outer cover layer 46 that covers the peripheral surface of the conductor 45 is provided. That is, the coaxial cable 40 has a structure in which the conductor 2, the insulating layer 3, the outer conductor 45, and the outer cover layer 46 are concentrically laminated in a cross-sectional shape. Since the information transmission cable is a coaxial cable 40, the diameter can be reduced. Since the insulated wire 1, the conductor 2, and the insulating layer 3 are the same as the insulated wire 1 in FIG. 1, they are designated by the same reference numerals and the description thereof will be omitted.
- the outer conductor 45 serves as a ground and functions as a shield for preventing electrical interference from other circuits.
- the outer conductor 45 covers the outer surface of the insulating layer 3.
- Examples of the outer conductor 45 include a braided shield, a horizontal winding shield, a tape shield, a conductive plastic shield, a metal tube shield, and the like. Above all, from the viewpoint of high frequency shielding property, a braided shield and a tape shield are preferable.
- the number of shields may be appropriately determined according to the shield to be used and the desired shielding property, and even if it is a single shield, it may be a double shield. It may be a multiple shield such as a triple shield or a triple shield.
- the outer cover layer 46 protects the conductor 2 and the outer conductor 45, and imparts functions such as flame retardancy and weather resistance in addition to insulating properties.
- the outer cover layer 46 may contain a thermoplastic resin as a main component.
- thermoplastic resin examples include polyvinyl chloride, low-density polyethylene, high-density polyethylene, foamed polyethylene, polyolefins such as polypropylene, polyurethane, fluororesin and the like.
- polyolefin and polyvinyl chloride are preferable from the viewpoint of cost and ease of processing.
- the above-mentioned materials exemplified may be used alone or in combination of two or more, and may be appropriately selected according to the function to be realized by the outer layer 46.
- the coaxial cable 40 is formed by covering the insulated wire 1 with an outer conductor 45 and an outer layer 46.
- the coating with the outer conductor 45 can be performed by a known method according to the shielding method to be applied.
- the braided shield can be formed by inserting the insulating electric wire 1 into the tubular braid and then reducing the diameter of the braid.
- the horizontal winding shield can be formed by winding a metal wire such as a copper wire around the insulating layer 3.
- the tape shield can be formed by wrapping a conductive tape such as a laminated tape of aluminum and polyester around the insulating layer 3.
- the coating with the outer cover layer 46 can be performed by the same method as the coating of the conductor 2 with the insulating layer 3 of the insulated wire 1. Further, the thermoplastic resin or the like may be applied to the peripheral surfaces of the insulated wire 1 and the outer conductor 45.
- the information transmission cable includes the insulated wire, it suppresses an increase in the dielectric loss tangent of the insulating layer and is excellent in heat resistance. Therefore, the information transmission cable can improve durability and reduce transmission loss in a high temperature environment.
- the insulated wire may have an insulating layer foamed. By foaming the insulating layer, the synthetic dielectric constant can be reduced and the weight of the insulated wire can be reduced.
- the information transmission cable may be a multi-core cable in which a plurality of twinax cables are further covered with an outer cover.
- a multi-core cable it is possible to transmit a signal with a larger capacity than that of a Twinax cable.
- the conductor can also be formed from a stranded wire obtained by twisting a plurality of metal wires.
- a plurality of types of metal wires may be combined.
- the number of twists is generally 7 or more.
- the insulated wire may have a primer layer directly laminated on the conductor.
- a primer layer a layer obtained by cross-linking a cross-linking resin such as ethylene that does not contain a metal hydroxide can be preferably used.
- Table 1 contains polypropylene ("Novatec EA9" manufactured by Japan Polypropylene Corporation: a polypropylene-based homopolymer) and a metal damage inhibitor as the main components of the olefin resin so that the contents (parts by mass) are as shown in Table 1.
- the mixture was mixed to obtain a resin composition for an insulating layer.
- a sheet-shaped insulating layer No. obtained by press-molding the resin composition for an insulating layer. 1 to No. 27 was made.
- the conditions for press molding were preheating at 180 ° C. for 5 minutes, then pressurizing at that temperature and holding for 5 minutes.
- N, N'-bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionyl] hydrazine (Fuji Film Wako Pure Chemical Industries, Ltd.) represented by the following (K-3) as a metal damage inhibitor "Irganox MD1024" manufactured by the company, melting point 60 ° C to 67 ° C) was used.
- Ethylene bis (oxyethielene) bis [3- (5-tert-butyl-hydroxy-m-tolyl) propionate] (BASF Japan's Irganox 245) is used as a phenolic antioxidant having a semi-hindered phenol structure. board. Further, as a phenolic antioxidant having a less hindered phenol structure, 4,4'-thiobis (3-methyl-6-tert-butyl) phenol (Nocrack 300 manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd.) was used.
- the dielectric loss tangent and relative permittivity of the obtained sheet-shaped sample were measured when a high-frequency electric field having a frequency of 10 GHz was applied according to a method according to JIS-R1641 (2007). The measurement was performed three times, and the average value was calculated.
- Heat-resistant aging test Insulation layer No. 1 to No. For 28, a heat-resistant aging test was carried out according to the following procedure in accordance with the JASO D611 standard. The sheet was punched into a dumbbell shape (JIS No. 3), placed in constant temperature baths set at 160 ° C, 180 ° C, and 200 ° C, and the time until the tensile elongation fell below 100% was determined and used as the life. An Arrhenius plot was performed based on the results, and the temperature at which the tensile elongation was 100% was estimated in the aging test for 10000 hours, the heat resistant temperature was set to 10000 hours, and 125 ° C. or higher was accepted.
- Table 1 shows the results of the dielectric loss tangent and relative permittivity measurements and the heat aging test.
- the insulating layer contains an antioxidant composed of a phenol-based antioxidant and a sulfur-based antioxidant excluding a sulfur-containing phenol-based antioxidant, and is the total of the above-mentioned antioxidants.
- No. 1 having a content of more than 1.0 part by mass and 5.0 parts by mass or less with respect to 100 parts by mass of the olefin resin.
- the dielectric loss tangent was suppressed to 4.20 ⁇ 10 -4 or less, and the heat resistant temperature for 10000 hours in the heat resistant aging test was 125 ° C. or higher.
- the phenolic antioxidant has a less hindered phenol structure or a semi-hindered phenol structure. 1 to No. No. 6 had a better effect of reducing the dielectric loss tangent.
- the insulating layer No. 1 in which the content of the antioxidant is 1.0 part by mass or less or more than 5.0 parts by mass with respect to 100 parts by mass of the olefin resin. 8 to No. For No. 11, the dielectric loss tangent had a high value exceeding 4.20 ⁇ 10 -4 , or the heat resistant temperature was inferior for 10000 hours.
- the insulated wire is excellent in heat resistance while suppressing an increase in the dielectric loss tangent of the insulating layer.
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Abstract
Description
上述の従来技術では、絶縁層が酸化防止剤等の添加剤を含有すると誘電正接が大きくなるおそれがある。上記車載情報電線では、伝送線路として信号減衰に対して誘電正接の影響がより大きい。一方、車載情報電線等で用いる絶縁材料においては、電気的特性を維持しつつ、耐熱性を向上することが望まれる。
本開示によれば、絶縁層の誘電正接の増大を抑制するとともに、耐熱性に優れる絶縁電線を提供することができる。
最初に本開示の実施態様を列記して説明する。
(式(3)及び(4)中、X1は-S-又は-NH-、R6はアルキル基である。)
当該絶縁電線が上記式(3)又は上記式(4)で表される硫黄系酸化防止剤を含有することで、耐熱性をより向上することができる。
以下、本開示の実施形態に係る絶縁電線及び情報伝送用ケーブルについて、適宜図面を参照しつつ詳説する。
当該絶縁電線は、1又は複数の線状の導体と、上記導体の外周面に積層され、1又は複数の絶縁層とを備える。図1は、本開示の一実施形態に係る絶縁電線の模式的横断面図である。図1に示すように、当該絶縁電線1は、線状の導体2と、この導体2の外周面に積層される1層の絶縁層3とを備える。
導体2は、例えば断面が円形状の丸線とされるが、断面が正方形状の角線又は長方形状の平角線や、複数の素線を撚り合わせた撚り線であってもよい。
絶縁層3は、導体2の外周面に形成される。
酸化防止剤は、絶縁層3の酸化を防止するものである。上記酸化防止剤は、フェノール系酸化防止剤と、硫黄含有フェノール系酸化防止剤を除く硫黄系酸化防止剤とから構成される。当該絶縁電線は酸化劣化しやすいオレフィン系樹脂を含有するが、上記酸化防止剤は、フェノール系酸化防止剤と、硫黄含有フェノール系酸化防止剤を除く硫黄系酸化防止剤とから構成されることで、絶縁層3の耐熱性をさらに向上できる。
上記絶縁層が金属害防止剤をさらに含有することが好ましい。金属害防止剤は、金属イオンをキレート形成により安定化し、金属イオンに起因する被覆材樹脂の劣化、いわゆる金属害を抑制する。上記絶縁層が金属害防止剤をさらに含有することで、金属害を抑制し、上記オレフィン系樹脂の酸化劣化を抑制できる。従って、上記絶縁層の誘電正接をより低減できる。本実施形態における金属害防止剤としては、銅害防止剤であることが好ましい。
上記絶縁層は、上記オレフィン系樹脂及び酸化防止剤以外にその他の成分として、例えば難燃剤、難燃助剤、顔料、酸化防止剤等を含有してもよい。
次に、当該絶縁電線の製造方法について説明する。当該絶縁電線は、絶縁層3が押出成型により形成される。この絶縁電線の製造方法は、絶縁層形成用樹脂組成物を上記導体2の外周面に押出被覆する工程(押出工程)を備える。上記絶縁層形成用樹脂組成物の構成は、上述の絶縁層と同様であるので説明を省略する。
当該絶縁電線は、絶縁層の誘電正接の増大を抑制するとともに、耐熱性に優れる。
当該情報伝送用ケーブルは、1又は複数の当該絶縁電線を備える。当該情報伝送用ケーブルとしては、例えば差動伝送用ケーブル、同軸ケーブル等が挙げられる。
差動伝送用ケーブルは、差動信号を伝送するケーブルとして、高速での通信が求められる分野において好適に使用される。差動伝送用ケーブルとしては、例えばツイナックス構造を有するツイナックスケーブルが挙げられる。
当該情報伝送用ケーブルの一実施形態であるツイナックスケーブルの製造方法は、例えば、第1の絶縁電線と第2の絶縁電線とを束ね、第3の導体であるトレイン線を配置して、その外周にシールドテープを巻くことにより、ツイナックスケーブルが製造される。
当該情報伝送用ケーブルの一実施形態である同軸ケーブルは、上述した当該絶縁電線と、上記絶縁電線の周面を被覆する外部導体と、上記外部導体の周面を被覆する外被層とを備え、上記絶縁電線が、1つの上記導体及びこの導体の周面を被覆する1つの上記絶縁層を含む。上記同軸ケーブルの実施形態について、図3及び図4を参照しつつ説明する。
当該同軸ケーブル40は、当該絶縁電線1を外部導体45及び外被層46により被覆することで形成される。
当該情報伝送用ケーブルは、当該絶縁電線を備えるので、絶縁層の誘電正接の増大を抑制するとともに、耐熱性に優れる。従って、当該情報伝送用ケーブルは、高温環境下での耐久性の向上及び伝送損失の低減を図ることができる。
今回開示された実施の形態は全ての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記実施形態の構成に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。
主成分となるオレフィン系樹脂としてのポリプロピレン(日本ポリプロ株式会社製の「ノバテックEA9」:ポリプロピレンベースのホモポリマー)及び金属害防止剤を、含有量(質量部)が表1の通りとなるように混合して絶縁層用樹脂組成物を得た。上記絶縁層用樹脂組成物をプレス成形して得られるシート状の絶縁層No.1~No.27を作製した。プレス成形の条件は180℃にて5分間予備加熱した後、さらにその温度で加圧し、5分間保持した。
また、レスヒンダードフェノール構造を有するフェノール系酸化防止剤として、4,4’-チオビス(3-メチル-6-tert-ブチル)フェノール(大内新興化学工業社製ノクラック300)を用いた。
以上のようにして得られた絶縁層No.1~No.27について、誘電正接及び比誘電率の測定並びに耐熱老化試験を行った。
得られたシート状の試料に対して、JIS-R1641(2007)に準ずる方法に従って、周波数10GHzの高周波電界を印加した場合における誘電正接及び比誘電率を測定した。測定は3回行い、平均値を求めた。
絶縁層No.1~No.28について、JASO D611規格に準拠して下記の手順で耐熱老化試験を実施した。
シートをダンベル形状(JIS3号)に打ち抜き、160℃、180℃、200℃に設定した各恒温槽に入れ、引張伸びが100%を切るまでの時間を求め寿命とした。結果を基にアレニウスプロットを行い、10000時間の老化試験で引張伸びが100%となる温度を推定し、10000時間耐熱温度とし、125℃以上を合格とした。
Claims (8)
- 1又は複数の線状の導体と、
上記導体の外周面に積層される1又は複数の絶縁層と
を備え、
上記絶縁層がオレフィン系樹脂及び酸化防止剤を含有し、
上記酸化防止剤の含有量が上記オレフィン系樹脂100質量部に対して1.0質量部超5.0質量部以下であり、
上記酸化防止剤がフェノール系酸化防止剤と、硫黄含有フェノール系酸化防止剤を除く硫黄系酸化防止剤とから構成される絶縁電線。 - 上記フェノール系酸化防止剤と上記硫黄系酸化防止剤との質量比が4:1から1:4である請求項1に記載の絶縁電線。
- 上記オレフィン系樹脂がポリプロピレンである請求項1から請求項4のいずれか1項に記載の絶縁電線。
- 上記絶縁層が金属害防止剤をさらに含有する請求項1から請求項5のいずれか1項に記載の絶縁電線。
- 周波数10GHzの高周波電界を印加した場合における上記絶縁層の誘電正接が4.2×10-4以下である請求項1から請求項6のいずれか1項に記載の絶縁電線。
- 請求項1から請求項7のいずれか1項に記載の絶縁電線を1又は複数備える情報伝送用ケーブル。
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