EP2117010A1 - Resin composition for insulation, and wire/cable using the same - Google Patents
Resin composition for insulation, and wire/cable using the same Download PDFInfo
- Publication number
- EP2117010A1 EP2117010A1 EP08721240A EP08721240A EP2117010A1 EP 2117010 A1 EP2117010 A1 EP 2117010A1 EP 08721240 A EP08721240 A EP 08721240A EP 08721240 A EP08721240 A EP 08721240A EP 2117010 A1 EP2117010 A1 EP 2117010A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cable
- resin composition
- insulation
- electric wire
- relative permittivity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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- 238000009413 insulation Methods 0.000 title claims abstract description 33
- 239000011342 resin composition Substances 0.000 title claims abstract description 32
- 229920000098 polyolefin Polymers 0.000 claims abstract description 13
- 229920005601 base polymer Polymers 0.000 claims abstract description 7
- 230000014759 maintenance of location Effects 0.000 claims description 20
- 230000032683 aging Effects 0.000 claims description 13
- 229920000181 Ethylene propylene rubber Polymers 0.000 claims description 9
- 229920001577 copolymer Polymers 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000012212 insulator Substances 0.000 abstract description 31
- 238000012360 testing method Methods 0.000 description 13
- 239000004020 conductor Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- -1 polyethylene Polymers 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 4
- 239000011256 inorganic filler Substances 0.000 description 4
- 229910003475 inorganic filler Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010734 process oil Substances 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000004902 Softening Agent Substances 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- 238000007765 extrusion coating Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000010382 chemical cross-linking Methods 0.000 description 2
- ZQMIGQNCOMNODD-UHFFFAOYSA-N diacetyl peroxide Chemical compound CC(=O)OOC(C)=O ZQMIGQNCOMNODD-UHFFFAOYSA-N 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 2
- 229920006225 ethylene-methyl acrylate Polymers 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920001179 medium density polyethylene Polymers 0.000 description 2
- 239000004701 medium-density polyethylene Substances 0.000 description 2
- 150000001451 organic peroxides Chemical class 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- WRXCBRHBHGNNQA-UHFFFAOYSA-N (2,4-dichlorobenzoyl) 2,4-dichlorobenzenecarboperoxoate Chemical compound ClC1=CC(Cl)=CC=C1C(=O)OOC(=O)C1=CC=C(Cl)C=C1Cl WRXCBRHBHGNNQA-UHFFFAOYSA-N 0.000 description 1
- KDGNCLDCOVTOCS-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy propan-2-yl carbonate Chemical compound CC(C)OC(=O)OOC(C)(C)C KDGNCLDCOVTOCS-UHFFFAOYSA-N 0.000 description 1
- NALFRYPTRXKZPN-UHFFFAOYSA-N 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane Chemical compound CC1CC(C)(C)CC(OOC(C)(C)C)(OOC(C)(C)C)C1 NALFRYPTRXKZPN-UHFFFAOYSA-N 0.000 description 1
- UBRWPVTUQDJKCC-UHFFFAOYSA-N 1,3-bis(2-tert-butylperoxypropan-2-yl)benzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC(C(C)(C)OOC(C)(C)C)=C1 UBRWPVTUQDJKCC-UHFFFAOYSA-N 0.000 description 1
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
- ODBCKCWTWALFKM-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhex-3-yne Chemical compound CC(C)(C)OOC(C)(C)C#CC(C)(C)OOC(C)(C)C ODBCKCWTWALFKM-UHFFFAOYSA-N 0.000 description 1
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 1
- YKTNISGZEGZHIS-UHFFFAOYSA-N 2-$l^{1}-oxidanyloxy-2-methylpropane Chemical group CC(C)(C)O[O] YKTNISGZEGZHIS-UHFFFAOYSA-N 0.000 description 1
- KRDXTHSSNCTAGY-UHFFFAOYSA-N 2-cyclohexylpyrrolidine Chemical compound C1CCNC1C1CCCCC1 KRDXTHSSNCTAGY-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- YIVJZNGAASQVEM-UHFFFAOYSA-N Lauroyl peroxide Chemical compound CCCCCCCCCCCC(=O)OOC(=O)CCCCCCCCCCC YIVJZNGAASQVEM-UHFFFAOYSA-N 0.000 description 1
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920002367 Polyisobutene Polymers 0.000 description 1
- 239000004708 Very-low-density polyethylene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- CHIHQLCVLOXUJW-UHFFFAOYSA-N benzoic anhydride Chemical compound C=1C=CC=CC=1C(=O)OC(=O)C1=CC=CC=C1 CHIHQLCVLOXUJW-UHFFFAOYSA-N 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000009503 electrostatic coating Methods 0.000 description 1
- 239000005042 ethylene-ethyl acrylate Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000012968 metallocene catalyst Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 229940070710 valerate Drugs 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- 229920001866 very low density polyethylene Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
Definitions
- the present invention relates to a resin composition for insulation useful as an insulator material or the like for a high voltage cable for X-ray apparatus which connects the X-ray tube of an x-ray apparatus and a high voltage generator, and to an electric wire/cable using the same.
- the high voltage cable for X-ray apparatus for connecting the X-ray tube of the x-ray apparatus and the high voltage generator is demanded that it has a small outer diameter, light weight, good flexibility, easiness of handling, small electrostatic capacitance of a high voltage insulator, followability to the repeated application of a high voltage, and the like.
- such a known high voltage cable for X-ray apparatus is formed by stranding two low-voltage insulated conductors and one or two bare conductors, forming an inner semiconductive layer on the stranded conductors, and sequentially forming thereon a high voltage insulator, an outer semiconductive layer, a shielding layer and a sheath.
- a high voltage insulator an EP rubber (ethylene-propylene rubber) which is flexible and has relatively good electrical characteristics is generally used (see, for example, patent Reference 1).
- the high voltage insulator may be formed to have a large thickness, but there is a problem that the cable has a large diameter.
- a material for the high voltage insulator a material having a relative permittivity lower than that of an existing EP rubber (a relative permittivity of about 3.0), for example, crosslinked polyethylene, polyethylene and the like having a relative permittivity of about 2.3 may be used. But, since such insulator materials having a low relative permittivity have large hardness, there is a problem that flexibility of the cable is impaired.
- a high voltage cable for X-ray apparatus used for a medical CT (computerized tomography) apparatus is required to have heat resistance against heat generation of the X-ray tube, but there is a problem that polyethylene is poor in heat resistance and its application to such usage becomes difficult.
- the present invention has been made in view of the above circumstances and provides a resin composition for insulation, which is useful as a high voltage insulator material or the like for a high voltage cable for X-ray apparatus and capable of decreasing the electrostatic capacitance of an insulator without increasing a diameter of the cable and without decreasing flexibility and heat resistance, and an electric wire/cable using the same.
- a resin composition for insulation of the present invention contains a polyolefin as a base polymer, wherein (a) an ash content is 20% by mass or below, (b) a relative permittivity is 2.8 or below, and (c) a type A durometer hardness is 90 or below.
- An electric wire/cable of the present invention has a coating formed of the above-described resin composition for insulation.
- the ash content is 10% by mass or below
- the relative permittivity is 2.6 or below
- the type A durometer hardness is 80 or below.
- a tensile strength retention is 80% or more and an elongation retention is 80% or more after heat aging (100°C, 96 hours).
- a gel fraction is 60% or more.
- the polyolefin contains an ethylene-propylene rubber.
- the electric wire/cable is a cable for high-voltage electronics.
- the present invention can decrease the electrostatic capacitance of the insulator without increasing the diameter of the cable or reducing the flexibility and heat resistance.
- the individual components composing the resin composition for insulation of the invention and the physical properties of the composition are described below.
- the physical properties were measured by the following method.
- polyolefin used as a base polymer of the resin composition for insulation according to the invention are ethylene-propylene rubbers such as ethylene-propylene copolymer (EPM) and ethylene-propylene-diene copolymer (EPDM), polyethylenes such as low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ultralow-density polyethylene (VLDPE) and linear low-density polyethylene (LLDPE), polypropylene (PP), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl methacrylate copolymer, ethylene-vinyl acetate copolymer (EVA), polyisobutylene and the like.
- EPM ethylene-propylene copolymer
- EPDM ethylene-propylene-diene copolymer
- polyethylenes such as low-dens
- ethylene copolymerized with ⁇ -olefine or cyclic olefin such as propylene, butene, pentene, hexane or octane by a metallocene catalyst can also be used. They are used alone or as a mixture.
- the polyolefin is preferably an ethylene-propylene rubber such as an ethylerie-propylene copolymer (EPM), an ethylene-propylene-diene copolymer (EPDM) or the like, and another polyolefin is preferably used as a component used together with the ethylene-propylene rubber.
- EPM ethylerie-propylene copolymer
- EPDM ethylene-propylene-diene copolymer
- the polyolefin is more preferably an ethylene-propylene rubber alone, and even more preferably an ethylene-propylene-diene copolymer (EPDM) alone.
- EPDM ethylene-propylene-diene copolymer
- MITSUI EPT trade name, manufactured by MITSUI CHEMICALS, INC.
- Esprene EPDM trade name, manufactured by SUMITOMO CHEMICAL Co., LTD.
- the resin composition for insulation according to the invention is coated or formed and has a polymer component crosslinked.
- a polymer component crosslinked there are a chemical cross-linking method by which a resin composition for insulation is previously added with a cross-linking reagent, formed and crosslinked, an electron beam cross-linking method applying electron beam irradiation, and the like.
- the cross-linking reagents used to perform the chemical cross-linking method are dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3, 1,3-bis(tert-butylperoxyisopropyl)benzene, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, n-butyl-4,4-bis(tert-butylperoxy) valerate, benzoyl oxide, 2,4-dichlorobenzoyl peroxide, tert-butylperoxybenzoate, tert-butylperoxyisopropyl carbonate, diacetyl peroxide, lauroyl peroxide, and tert-butylcumyl peroxide
- a cross-linking degree is preferably 60% or more at a gel fraction, more preferably 80% or more, and most preferably 85% or more. If the gel fraction is less than 60%, the heat resistance becomes insufficient. For example, when the resin composition of the invention used as the insulator material for the high voltage cable for X-ray apparatus used for the medical CT apparatus, there is a possibility that heat resistance durable to the heat generation of the X-ray tube cannot be obtained.
- the gel fraction may be measured according to the testing method for degree of cross-linking specified in JIS C 3005.
- the resin composition for insulation according to the invention may be further blended with inorganic fillers (for example, talc, calcium carbonate, clay, silica, magnesium hydroxide, etc.), processing aids, cross-linking aids, flame retardants, antioxidants, ultraviolet absorbers, coloring agents, softening agents, plasticizers, lubricants, and other additives in a range not inhibiting the effects of the invention, if necessary.
- inorganic fillers for example, talc, calcium carbonate, clay, silica, magnesium hydroxide, etc.
- processing aids for example, talc, calcium carbonate, clay, silica, magnesium hydroxide, etc.
- cross-linking aids for example, flame retardants, antioxidants, ultraviolet absorbers, coloring agents, softening agents, plasticizers, lubricants, and other additives in a range not inhibiting the effects of the invention, if necessary.
- the resin composition for insulation of the invention has (a) an ash content of 20% by mass or below, preferably 10% by mass or below, more preferably 5% by mass or below, and most preferably 3% by mass or below. If the ash content exceeds 20% by mass, a relative permittivity increases, and the electrostatic capacitance of the insulator cannot be decreased.
- the resin composition for insulation of the invention has (b) a relative permittivity of 2.8 or below, preferably 2.6 or below, and more preferably 2.4 or below. If the relative permittivity exceeds 2.8, the electrostatic capacitance of the insulator cannot be decreased without involving an increase of the diameter of the cable.
- the resin composition for insulation of the invention has (c) a type A durometer hardness of 90 or below, preferably 80 or below, and more preferably 70 or below. If the type A durometer hardness exceeds 90, flexibility and ease in handling of the cable are degraded.
- the resin composition for insulation of the invention has a tensile strength retention and an elongation retention after (d) heat aging (100°C, 96 hours) each of preferably 80% or more, and more preferably 90% or more. If either the tensile strength retention or the elongation retention after the heat aging (100°C, 96 hours) is less than 80%, the heat resistance becomes insufficient, and thus it becomes difficult to apply to the insulator material for the high voltage cable for X-ray apparatus, which is used for the medical CT apparatus.
- the resin composition for insulation of the invention can be produced easily by kneading homogeneously the above-described individual components by an ordinary kneader such as a Banbury mixer, a tumbler, a pressurizing kneader, a kneading extruder, a mixing roller or the like.
- an ordinary kneader such as a Banbury mixer, a tumbler, a pressurizing kneader, a kneading extruder, a mixing roller or the like.
- the obtained composition is coated on the outer periphery of the conductor directly or via another coating by extruding or wound in a tape shape to produce the electric wire/cable of the invention.
- the composition is preferably crosslinked after coating or after forming.
- FIG. 1 is a transverse sectional view showing a high voltage cable for x-ray apparatus of an embodiment of the electric wire/cable of the invention.
- 1 denotes a low-voltage core
- the low-voltage core 1 is composed of, for example, a conductor 1a having a cross-sectional area of 1.8 mm 2 which is formed by concentric stranding of 19 tin-coated annealed copper wires having a diameter of 0.35 mm, and an insulator 1b having a thickness of, for example, 0.25 mm which is formed of, for example, a fluorine resin such as polytetrafluoroethylene, and formed on the conductor 1a.
- a conductor 1a having a cross-sectional area of 1.8 mm 2 which is formed by concentric stranding of 19 tin-coated annealed copper wires having a diameter of 0.35 mm
- an insulator 1b having a thickness of, for example, 0.25 mm which is formed of, for example, a fluorine resin such as polytetrafluoroethylene, and formed on the conductor 1a.
- 2 denotes a high-voltage core, which is composed of a bare conductor 2a having a cross-sectional area of 1.25 mm 2 which is formed by, for example, concentric stranding of 50 tin-coated annealed copper wires having a diameter of 0.18 mm.
- a semiconductive coating may be formed on the bare conductor 2a, if necessary.
- the inner semiconductive layer 3 and the outer semiconductive layer 5 are formed by, for example, winding a semiconductive tape formed of a nylon substrate, a polyester substrate or the like and/or extrusion coating of a general-purpose semiconductive ethylene-propylene rubber, and the high voltage insulator 4 is formed by extrusion coating of the above-described resin composition for insulation.
- the inner semiconductive layer 3 is determined to have an outer diameter of, for example, 5.0 mm, and the high voltage insulator 4 and the outer semiconductive layer 5 each are coated to have, for example, a thickness of 4.4 mm and 0.2 mm.
- the outer semiconductive layer 5 has thereon, for example, a shielding layer 6 having a thickness of 0.3 mm composed of a braid of tin-coated annealed copper wires, and additionally has thereon, for example, a sheath 7 having a thickness of 1.0 mm formed by extrusion coating of a vinyl chloride resin.
- the above-configured high voltage cable for X-ray apparatus has the high voltage insulator 4 formed of the resin composition for insulation having a relative permittivity of 2.8 or below and a type A durometer hardness of 90 or below. Therefore, the electrostatic capacitance of the high voltage insulator 4 can be made smaller than that of the conventional high voltage insulator, the cable flexibility does not become low, and the cable outer diameter can be made to be substantially the same as the conventional cable.
- a cable for high-voltage electronics suitable as a high voltage cable for X-ray apparatus can be provided without increasing the thickness of the high voltage insulator (i.e. without increasing the cable outer diameter). If it is sufficient by having the same electrostatic capacitance as the conventional electrostatic capacitance, the outer diameter of the high voltage insulator can be decreased within a range not affecting the insulation performance. Namely, the cable can be reduced to have a small diameter and a light weight, and a cable for high-voltage electronics which is good in flexibility and easy to handle can be provided.
- Examples of the cables for high-voltage electronics include a high voltage cable for X-ray apparatus used for the X-ray apparatus and a high-voltage DC cable used for the high-voltage DC circuit of an electron beam welding device, an electric discharge machining device, an electrostatic coating device, a vacuum deposition device and the like.
- FIG. 2 and FIG. 3 each are transverse sectional views showing a high voltage cable for X-ray apparatus of another embodiment of the electric wire/cable of the invention.
- the high voltage cable for X-ray apparatus shown in FIG. 2 is configured in the same manner as the high voltage cable for X-ray apparatus shown in FIG. 1 except that the core portion 8 is configured by stranding two low-voltage cores 1 and one high-voltage core 2 (the drawing shows an example that a semiconductive coating 2b is formed on the bare conductor 2a).
- the high voltage cable for X-ray apparatus shown in FIG. 3 is an example of a so-called single core cable, which has a structure that the core portion 8 is formed of the conductor 2a only, and the inner semiconductive layer 3, the high voltage insulator 4, the outer semiconductive layer 5, the shielding layer 6 and the sheath 6 are sequentially formed on the conductor 2a.
- the electrostatic capacitance of the high voltage insulator 4 can be made smaller than that of the conventional cable, the cable flexibility is not lowered, and the cable outer diameter can be made substantially the same as that of the conventional cable.
- a cable for high-voltage electronics suitable as a high voltage cable for X-ray apparatus can be provided without increasing the thickness of the high voltage insulator (i.e. without increasing the cable outer diameter). If it is sufficient by having the same electrostatic capacitance as the conventional one, the outer diameter of the high voltage insulator can be decreased within the range not affecting the insulation performance. Namely, the cable can be reduced to have a small diameter and a light weight, and a cable for high-voltage electronics which is good in flexibility and easy to handle can be provided.
- Examples 1 to 7, Comparative Examples 1 to 3 As a base polymer, EPDM (manufactured by MITSUI CHEMICALS, INC., trade name MITSUI EPT1045), as an inorganic filler, talc (manufactured by TAKEHARA KAGAKU KOGYO CO., LTD., trade name Hytron), as a softening agent, a process oil (manufactured by Idemitsu Kosan Co., Ltd., trade name Diana Process Oil PW-90) and as a cross-linking reagent, dicumyl peroxide (manufactured by NOF CORPORATION, trade name PERCUMYL D), which is one type of organic peroxide, were used. They were kneaded homogeneously at the ratios shown in Table 1 by a mixing roll and extruded into a sheet form.
- EPDM manufactured by MITSUI CHEMICALS, INC., trade name MITSUI EPT1045
- talc manufactured by
- test sheets were crosslinked by application of heat and pressure by a press machine under conditions of 170°C x 30 minutes and a pressure of 19 MPa to produce test sheets.
- the test sheets were produced in two types having thickness of 0.5 mm and 2 mm.
- test sheets were evaluated by measuring an ash content, a gel fraction, a type A durometer hardness, a relative permittivity, and also a tensile strength retention and elongation retention after heat aging (100°C, 96 hours).
- the test sheet having thickness of 2 mm was used in only the heat aging test. The results are shown in the lower half columns of Table 1.
- EPDM MITSUI EPT1045
- silica manufactured by TOSOH SILICA CORPORATION, trade name Nip Seal VN3
- a process oil Diana Process Oil PW-90
- a cross-linking reagent dicumyl peroxide (PERCUMYL D) which is one type of organic peroxide, were used. They were kneaded homogeneously at the ratios shown in Table 2 by a mixing roll and extruded into a sheet form.
- test sheets were crosslinked by application of heat and pressure by a press machine under conditions of 170°C x 30 minutes and a pressure of 19 MPa to produce test sheets.
- the test sheets were produced in two types having thickness of 0.5 mm and 2 mm.
- test sheets were evaluated by measuring an ash content, a gel fraction, a type A durometer hardness, a relative permittivity, and also a tensile strength retention and elongation retention after heat aging (100°C, 96 hours).
- the test sheet having a thickness of 2 mm was used in only the heat aging test. The results are shown in the lower half columns of Table 2.
- Comparative Examples 4 to 6 having an ash content of exceeding 20% by mass had a relative permittivity of 3.0 or more even when silica was used as an inorganic filler
- Examples 8 to 13 having an ash content of 20% by mass or below, a type A durometer hardness of 90 or below and a relative permittivity of 2.8 or below had a type A durometer hardness of 90 or below and a relative permittivity of 2.8 or below.
- Examples 8 to 13 had both low hardness required to provide the cable with flexibility and a low relative permittivity required to achieve a cable having both a small diameter and a low electrostatic capacitance.
- Examples 8 to 13, in which a tensile strength retention and elongation retention after heat aging (100°C, 96 hours) were 80% or more and a gel fraction was 60% or more, also had good heat resistance.
- the resin composition for insulation of the invention can be used extensively for an electrical insulating material and a sheath material of various kinds of electric wires/cables such as power cables, cables for high-voltage electronics, cables for control, cables for communications, cables for instrumentation, cables for signals, cables for moving and the like, and also for usages requiring electrical insulation such as electric wire/cable attachments such as plugs.
- the resin composition for insulation of the invention has a small relative permittivity and excellent flexibility, it is useful as an insulator material of a cable for high-voltage electronics, such as a high voltage cable for X-ray apparatus, a high-voltage DC cable, and the like.
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Abstract
Description
- The present invention relates to a resin composition for insulation useful as an insulator material or the like for a high voltage cable for X-ray apparatus which connects the X-ray tube of an x-ray apparatus and a high voltage generator, and to an electric wire/cable using the same.
- Generally, the high voltage cable for X-ray apparatus for connecting the X-ray tube of the x-ray apparatus and the high voltage generator is demanded that it has a small outer diameter, light weight, good flexibility, easiness of handling, small electrostatic capacitance of a high voltage insulator, followability to the repeated application of a high voltage, and the like.
- Conventionally, such a known high voltage cable for X-ray apparatus is formed by stranding two low-voltage insulated conductors and one or two bare conductors, forming an inner semiconductive layer on the stranded conductors, and sequentially forming thereon a high voltage insulator, an outer semiconductive layer, a shielding layer and a sheath. For the high voltage insulator, an EP rubber (ethylene-propylene rubber) which is flexible and has relatively good electrical characteristics is generally used (see, for example, patent Reference 1).
- Recently, X-ray apparatuses is advancing significantly, and a cable having higher performance is demanded accordingly. Especially, demands for the high voltage insulator having lower electrostatic capacitance are increasing.
- To decrease the electrostatic capacitance of the high voltage insulator, the high voltage insulator may be formed to have a large thickness, but there is a problem that the cable has a large diameter. And, as a material for the high voltage insulator, a material having a relative permittivity lower than that of an existing EP rubber (a relative permittivity of about 3.0), for example, crosslinked polyethylene, polyethylene and the like having a relative permittivity of about 2.3 may be used. But, since such insulator materials having a low relative permittivity have large hardness, there is a problem that flexibility of the cable is impaired. For example, a high voltage cable for X-ray apparatus used for a medical CT (computerized tomography) apparatus is required to have heat resistance against heat generation of the X-ray tube, but there is a problem that polyethylene is poor in heat resistance and its application to such usage becomes difficult.
- Patent Reference 1:
JP-A 2002-245866 - The present invention has been made in view of the above circumstances and provides a resin composition for insulation, which is useful as a high voltage insulator material or the like for a high voltage cable for X-ray apparatus and capable of decreasing the electrostatic capacitance of an insulator without increasing a diameter of the cable and without decreasing flexibility and heat resistance, and an electric wire/cable using the same.
- A resin composition for insulation of the present invention contains a polyolefin as a base polymer, wherein (a) an ash content is 20% by mass or below, (b) a relative permittivity is 2.8 or below, and (c) a type A durometer hardness is 90 or below.
- An electric wire/cable of the present invention has a coating formed of the above-described resin composition for insulation.
- According to an aspect of the present invention, (a) the ash content is 10% by mass or below, (b) the relative permittivity is 2.6 or below, and (c) the type A durometer hardness is 80 or below.
- According to an aspect of the present invention, (d) a tensile strength retention is 80% or more and an elongation retention is 80% or more after heat aging (100°C, 96 hours).
- According to an aspect of the present invention, a gel fraction is 60% or more.
- According to an aspect of the present invention, the polyolefin contains an ethylene-propylene rubber.
- According to an aspect of the present invention, the electric wire/cable is a cable for high-voltage electronics.
- The present invention can decrease the electrostatic capacitance of the insulator without increasing the diameter of the cable or reducing the flexibility and heat resistance.
-
- [
FIG. 1] FIG. 1 is a transverse sectional view showing an embodiment of the electric wire/cable of the invention. - [
FIG. 2] FIG. 2 is a transverse sectional view showing another embodiment of the electric wire/cable of the invention. - [
FIG. 3] FIG. 3 is a transverse sectional view showing still another embodiment of the electric wire/cable of the invention. - Embodiments of the invention are described below.
- The individual components composing the resin composition for insulation of the invention and the physical properties of the composition are described below. The physical properties were measured by the following method.
- (a) Ash content
Measured according to JIS K 6228. - (b) Relative permittivity
Measured by a high voltage Schering bridge method under conditions of 1 kV and a frequency of 50 Hz. - (c) Type A durometer hardness
Measured by a type A durometer of JIS k 6253. - (d) Tensile strength retention and elongation retention after heat aging (100°C, 96 hours)
Measured according to JIS K 6257 under heat aging conditions of 100°C × 96 hours. - Examples of polyolefin used as a base polymer of the resin composition for insulation according to the invention are ethylene-propylene rubbers such as ethylene-propylene copolymer (EPM) and ethylene-propylene-diene copolymer (EPDM), polyethylenes such as low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ultralow-density polyethylene (VLDPE) and linear low-density polyethylene (LLDPE), polypropylene (PP), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl methacrylate copolymer, ethylene-vinyl acetate copolymer (EVA), polyisobutylene and the like. And, ethylene copolymerized with α-olefine or cyclic olefin such as propylene, butene, pentene, hexane or octane by a metallocene catalyst can also be used. They are used alone or as a mixture. The polyolefin is preferably an ethylene-propylene rubber such as an ethylerie-propylene copolymer (EPM), an ethylene-propylene-diene copolymer (EPDM) or the like, and another polyolefin is preferably used as a component used together with the ethylene-propylene rubber. The polyolefin is more preferably an ethylene-propylene rubber alone, and even more preferably an ethylene-propylene-diene copolymer (EPDM) alone. Specific examples of the ethylene-propylene-diene copolymer (EPDM) are MITSUI EPT (trade name, manufactured by MITSUI CHEMICALS, INC.), Esprene EPDM (trade name, manufactured by SUMITOMO CHEMICAL Co., LTD.).
- It is preferable that the resin composition for insulation according to the invention is coated or formed and has a polymer component crosslinked. Thus, its mechanical properties such as heat resistance and abrasion resistance can be improved. As usable cross-linking methods, there are a chemical cross-linking method by which a resin composition for insulation is previously added with a cross-linking reagent, formed and crosslinked, an electron beam cross-linking method applying electron beam irradiation, and the like. The cross-linking reagents used to perform the chemical cross-linking method are dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3, 1,3-bis(tert-butylperoxyisopropyl)benzene, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, n-butyl-4,4-bis(tert-butylperoxy) valerate, benzoyl oxide, 2,4-dichlorobenzoyl peroxide, tert-butylperoxybenzoate, tert-butylperoxyisopropyl carbonate, diacetyl peroxide, lauroyl peroxide, and tert-butylcumyl peroxide.
- A cross-linking degree is preferably 60% or more at a gel fraction, more preferably 80% or more, and most preferably 85% or more. If the gel fraction is less than 60%, the heat resistance becomes insufficient. For example, when the resin composition of the invention used as the insulator material for the high voltage cable for X-ray apparatus used for the medical CT apparatus, there is a possibility that heat resistance durable to the heat generation of the X-ray tube cannot be obtained. The gel fraction may be measured according to the testing method for degree of cross-linking specified in JIS C 3005.
- In addition to the above-described components, the resin composition for insulation according to the invention may be further blended with inorganic fillers (for example, talc, calcium carbonate, clay, silica, magnesium hydroxide, etc.), processing aids, cross-linking aids, flame retardants, antioxidants, ultraviolet absorbers, coloring agents, softening agents, plasticizers, lubricants, and other additives in a range not inhibiting the effects of the invention, if necessary.
- The resin composition for insulation of the invention has (a) an ash content of 20% by mass or below, preferably 10% by mass or below, more preferably 5% by mass or below, and most preferably 3% by mass or below. If the ash content exceeds 20% by mass, a relative permittivity increases, and the electrostatic capacitance of the insulator cannot be decreased.
- The resin composition for insulation of the invention has (b) a relative permittivity of 2.8 or below, preferably 2.6 or below, and more preferably 2.4 or below.
If the relative permittivity exceeds 2.8, the electrostatic capacitance of the insulator cannot be decreased without involving an increase of the diameter of the cable. - In addition, the resin composition for insulation of the invention has (c) a type A durometer hardness of 90 or below, preferably 80 or below, and more preferably 70 or below. If the type A durometer hardness exceeds 90, flexibility and ease in handling of the cable are degraded.
- The resin composition for insulation of the invention has a tensile strength retention and an elongation retention after (d) heat aging (100°C, 96 hours) each of preferably 80% or more, and more preferably 90% or more. If either the tensile strength retention or the elongation retention after the heat aging (100°C, 96 hours) is less than 80%, the heat resistance becomes insufficient, and thus it becomes difficult to apply to the insulator material for the high voltage cable for X-ray apparatus, which is used for the medical CT apparatus.
- The resin composition for insulation of the invention can be produced easily by kneading homogeneously the above-described individual components by an ordinary kneader such as a Banbury mixer, a tumbler, a pressurizing kneader, a kneading extruder, a mixing roller or the like.
- The obtained composition is coated on the outer periphery of the conductor directly or via another coating by extruding or wound in a tape shape to produce the electric wire/cable of the invention. As described above, the composition is preferably crosslinked after coating or after forming.
-
FIG. 1 is a transverse sectional view showing a high voltage cable for x-ray apparatus of an embodiment of the electric wire/cable of the invention. - In
FIG. 1, 1 denotes a low-voltage core, and the low-voltage core 1 is composed of, for example, aconductor 1a having a cross-sectional area of 1.8 mm2 which is formed by concentric stranding of 19 tin-coated annealed copper wires having a diameter of 0.35 mm, and aninsulator 1b having a thickness of, for example, 0.25 mm which is formed of, for example, a fluorine resin such as polytetrafluoroethylene, and formed on theconductor 1a. And, 2 denotes a high-voltage core, which is composed of abare conductor 2a having a cross-sectional area of 1.25 mm2 which is formed by, for example, concentric stranding of 50 tin-coated annealed copper wires having a diameter of 0.18 mm. A semiconductive coating may be formed on thebare conductor 2a, if necessary. - Two low-
voltage cores 1 and two high-voltage cores 2 are stranded to form acore portion 8, and an innersemiconductive layer 3, ahigh voltage insulator 4 and an outersemiconductive layer 5 are sequentially formed on the outer periphery of it. The innersemiconductive layer 3 and the outersemiconductive layer 5 are formed by, for example, winding a semiconductive tape formed of a nylon substrate, a polyester substrate or the like and/or extrusion coating of a general-purpose semiconductive ethylene-propylene rubber, and thehigh voltage insulator 4 is formed by extrusion coating of the above-described resin composition for insulation. The innersemiconductive layer 3 is determined to have an outer diameter of, for example, 5.0 mm, and thehigh voltage insulator 4 and the outersemiconductive layer 5 each are coated to have, for example, a thickness of 4.4 mm and 0.2 mm. - The outer
semiconductive layer 5 has thereon, for example, ashielding layer 6 having a thickness of 0.3 mm composed of a braid of tin-coated annealed copper wires, and additionally has thereon, for example, asheath 7 having a thickness of 1.0 mm formed by extrusion coating of a vinyl chloride resin. - The above-configured high voltage cable for X-ray apparatus has the
high voltage insulator 4 formed of the resin composition for insulation having a relative permittivity of 2.8 or below and a type A durometer hardness of 90 or below. Therefore, the electrostatic capacitance of thehigh voltage insulator 4 can be made smaller than that of the conventional high voltage insulator, the cable flexibility does not become low, and the cable outer diameter can be made to be substantially the same as the conventional cable. - In other words, a cable for high-voltage electronics suitable as a high voltage cable for X-ray apparatus can be provided without increasing the thickness of the high voltage insulator (i.e. without increasing the cable outer diameter). If it is sufficient by having the same electrostatic capacitance as the conventional electrostatic capacitance, the outer diameter of the high voltage insulator can be decreased within a range not affecting the insulation performance. Namely, the cable can be reduced to have a small diameter and a light weight, and a cable for high-voltage electronics which is good in flexibility and easy to handle can be provided.
- Examples of the cables for high-voltage electronics include a high voltage cable for X-ray apparatus used for the X-ray apparatus and a high-voltage DC cable used for the high-voltage DC circuit of an electron beam welding device, an electric discharge machining device, an electrostatic coating device, a vacuum deposition device and the like.
-
FIG. 2 and FIG. 3 each are transverse sectional views showing a high voltage cable for X-ray apparatus of another embodiment of the electric wire/cable of the invention. - The high voltage cable for X-ray apparatus shown in
FIG. 2 is configured in the same manner as the high voltage cable for X-ray apparatus shown inFIG. 1 except that thecore portion 8 is configured by stranding two low-voltage cores 1 and one high-voltage core 2 (the drawing shows an example that asemiconductive coating 2b is formed on thebare conductor 2a). And, the high voltage cable for X-ray apparatus shown inFIG. 3 is an example of a so-called single core cable, which has a structure that thecore portion 8 is formed of theconductor 2a only, and the innersemiconductive layer 3, thehigh voltage insulator 4, the outersemiconductive layer 5, theshielding layer 6 and thesheath 6 are sequentially formed on theconductor 2a. When the above cables are compared with a conventional similar type of cable, the electrostatic capacitance of thehigh voltage insulator 4 can be made smaller than that of the conventional cable, the cable flexibility is not lowered, and the cable outer diameter can be made substantially the same as that of the conventional cable. - In other words, a cable for high-voltage electronics suitable as a high voltage cable for X-ray apparatus can be provided without increasing the thickness of the high voltage insulator (i.e. without increasing the cable outer diameter). If it is sufficient by having the same electrostatic capacitance as the conventional one, the outer diameter of the high voltage insulator can be decreased within the range not affecting the insulation performance. Namely, the cable can be reduced to have a small diameter and a light weight, and a cable for high-voltage electronics which is good in flexibility and easy to handle can be provided.
- The present invention is described in further detail below with reference to examples but not limited to the examples at all in any aspect.
- Examples 1 to 7, Comparative Examples 1 to 3 As a base polymer, EPDM (manufactured by MITSUI CHEMICALS, INC., trade name MITSUI EPT1045), as an inorganic filler, talc (manufactured by TAKEHARA KAGAKU KOGYO CO., LTD., trade name Hytron), as a softening agent, a process oil (manufactured by Idemitsu Kosan Co., Ltd., trade name Diana Process Oil PW-90) and as a cross-linking reagent, dicumyl peroxide (manufactured by NOF CORPORATION, trade name PERCUMYL D), which is one type of organic peroxide, were used. They were kneaded homogeneously at the ratios shown in Table 1 by a mixing roll and extruded into a sheet form.
- The above-described individual sheets were crosslinked by application of heat and pressure by a press machine under conditions of 170°C x 30 minutes and a pressure of 19 MPa to produce test sheets. The test sheets were produced in two types having thickness of 0.5 mm and 2 mm.
- The obtained test sheets were evaluated by measuring an ash content, a gel fraction, a type A durometer hardness, a relative permittivity, and also a tensile strength retention and elongation retention after heat aging (100°C, 96 hours). In the measurement/evaluation test, the test sheet having thickness of 2 mm was used in only the heat aging test. The results are shown in the lower half columns of Table 1.
-
- It is apparent from Table 1 that Comparative Examples 1 to 3 having an ash content of exceeding 20% by mass had a relative permittivity of 3.0 or more, and Examples 1 to 7 having an ash content of 20% by mass or below had a type A durometer hardness of 90 or below and a relative permittivity of 2.8 or below. Thus, it was confirmed that Examples 1 to 7 had both low hardness required to provide the cable with flexibility and a low relative permittivity required to achieve a cable having both a small diameter and a low electrostatic capacitance. In addition, Examples 1 to 6, in which a tensile strength retention and elongation retention after heat aging (100°C, 96 hours) were 80% or more and a gel fraction was 60% or more, had good heat resistance.
- Examples 8 to 13, Comparative Examples 4 to 6 As a base polymer, EPDM (MITSUI EPT1045), as an inorganic filler, silica (manufactured by TOSOH SILICA CORPORATION, trade name Nip Seal VN3), as a softening agent, a process oil (Diana Process Oil PW-90) and as a cross-linking reagent, dicumyl peroxide (PERCUMYL D), which is one type of organic peroxide, were used. They were kneaded homogeneously at the ratios shown in Table 2 by a mixing roll and extruded into a sheet form.
- The above-described individual sheets were crosslinked by application of heat and pressure by a press machine under conditions of 170°C x 30 minutes and a pressure of 19 MPa to produce test sheets. The test sheets were produced in two types having thickness of 0.5 mm and 2 mm.
- The obtained test sheets were evaluated by measuring an ash content, a gel fraction, a type A durometer hardness, a relative permittivity, and also a tensile strength retention and elongation retention after heat aging (100°C, 96 hours). In the measurement/evaluation test, the test sheet having a thickness of 2 mm was used in only the heat aging test. The results are shown in the lower half columns of Table 2.
-
- It is apparent from Table 2 that Comparative Examples 4 to 6 having an ash content of exceeding 20% by mass had a relative permittivity of 3.0 or more even when silica was used as an inorganic filler, and Examples 8 to 13 having an ash content of 20% by mass or below, a type A durometer hardness of 90 or below and a relative permittivity of 2.8 or below had a type A durometer hardness of 90 or below and a relative permittivity of 2.8 or below. Thus, it was confirmed that Examples 8 to 13 had both low hardness required to provide the cable with flexibility and a low relative permittivity required to achieve a cable having both a small diameter and a low electrostatic capacitance. In addition, Examples 8 to 13, in which a tensile strength retention and elongation retention after heat aging (100°C, 96 hours) were 80% or more and a gel fraction was 60% or more, also had good heat resistance.
- The invention is not limited to the embodiments and examples described above. It is to be understood that modifications and variations of the embodiments can be made without departing from the spirit and scope of the invention.
- This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No.
2007-55864 filed on March 6, 2007 - The resin composition for insulation of the invention can be used extensively for an electrical insulating material and a sheath material of various kinds of electric wires/cables such as power cables, cables for high-voltage electronics, cables for control, cables for communications, cables for instrumentation, cables for signals, cables for moving and the like, and also for usages requiring electrical insulation such as electric wire/cable attachments such as plugs. Especially, since the resin composition for insulation of the invention has a small relative permittivity and excellent flexibility, it is useful as an insulator material of a cable for high-voltage electronics, such as a high voltage cable for X-ray apparatus, a high-voltage DC cable, and the like.
Claims (18)
- A resin composition for insulation containing a polyolefin as a base polymer,
wherein (a) an ash content is 20% by mass or below, (b) a relative permittivity is 2.8 or below, and (c) a type A durometer hardness is 90 or below. - The resin composition for insulation according to claim 1,
wherein (a) the ash content is 10% by mass or below, (b) the relative permittivity is 2.6 or bellow, and (c) the type A durometer hardness is 80 or below. - The resin composition for insulation according to claim 1,
wherein (a) the ash content is 5% by mass or below, (b) the relative permittivity is 2.4 or below, and (c) the type A durometer hardness is 70 or below. - The resin composition for insulation according to claim 1,
wherein (d) a tensile strength retention is 80% or more and an elongation retention is 80% or more after heat aging (100°C, 96 hours). - The resin composition for insulation according to claim 1,
wherein a gel fraction is 60% or more. - The resin composition for insulation according to claim 1,
wherein the gel fraction is 80% or more. - The resin composition for insulation according to claim 1,
wherein the polyolefin comprises an ethylene-propylene rubber. - The resin composition for insulation according to claim 1,
wherein the polyolefin comprises an ethylene-propylene-diene copolymer. - An electric wire/cable having a coating which is composed of a resin composition for insulation containing a polyolefin as a base polymer, wherein (a) an ash content is 20% by mass or below, (b) a relative permittivity is 2.8 or below, and (c) a type A durometer hardness is 90 or below.
- The resin composition for insulation according to claim 9,
wherein (a) the ash content is 10% by mass or bellow, (b) the relative permittivity is 2.6 or below, and (c) the type A durometer hardness is 80 or below. - The electric wire/cable according to claim 9,
wherein (a) the ash content is 5% by mass or below, (b) the relative permittivity is 2.4 or below, and (c) the type A durometer hardness is 70 or below. - The electric wire/cable according to claim 9,
wherein (d) a tensile strength retention is 80% or more and an elongation retention is 80% or more after heat aging (100°C, 96 hours). - The electric wire/cable according to claim 9,
wherein a gel fraction is 60% or more. - The electric wire/cable according to claim 9,
wherein the gel fraction is 80% or more. - The electric wire/cable according to claim 9,
wherein the polyolefin comprises an ethylene-propylene rubber. - The electric wire/cable according to claim 9,
wherein the polyolefin comprises an ethylene-propylene-diene copolymer. - The electric wire/cable according to claim 9,
wherein the electric wire/cable is a cable for high-voltage electronics. - The electric wire/cable according to claim 9,
wherein the electric wire/cable is a high voltage cable for X-ray apparatus.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007055864 | 2007-03-06 | ||
PCT/JP2008/053820 WO2008108355A1 (en) | 2007-03-06 | 2008-03-04 | Resin composition for insulation, and wire/cable using the same |
Publications (2)
Publication Number | Publication Date |
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EP2117010A1 true EP2117010A1 (en) | 2009-11-11 |
EP2117010A4 EP2117010A4 (en) | 2012-06-27 |
Family
ID=39738233
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP08721240A Withdrawn EP2117010A4 (en) | 2007-03-06 | 2008-03-04 | Resin composition for insulation, and wire/cable using the same |
Country Status (3)
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EP (1) | EP2117010A4 (en) |
JP (1) | JPWO2008108355A1 (en) |
WO (1) | WO2008108355A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2584568A1 (en) * | 2010-06-18 | 2013-04-24 | Swcc Showa Cable Systems Co., Ltd. | Cable for high-voltage electronic devices |
US9165697B2 (en) | 2012-11-20 | 2015-10-20 | Hitachi Metals, Ltd. | Peroxide crosslinked resin composition and electric wire and cable using same |
CN106971768A (en) * | 2017-05-13 | 2017-07-21 | 中天科技装备电缆有限公司 | A kind of new-energy automobile inside high-tension cable and preparation method thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5438332B2 (en) * | 2009-02-05 | 2014-03-12 | 昭和電線ケーブルシステム株式会社 | High voltage electronics cable |
Citations (2)
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EP0497169A2 (en) * | 1991-01-30 | 1992-08-05 | Felten & Guilleaume Energietechnik AG | X-ray line |
DE19641396A1 (en) * | 1996-09-27 | 1998-04-02 | Siemens Ag | Flexible insulation for high voltage electric cable or wire with high and migration resistance |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3053233B2 (en) * | 1991-02-22 | 2000-06-19 | 三菱電線工業株式会社 | Radiation resistant composition |
JPH07330990A (en) * | 1994-06-08 | 1995-12-19 | Sumitomo Electric Ind Ltd | Rubber material for equipment related to power cable |
JPH0822717A (en) * | 1994-07-05 | 1996-01-23 | Fujikura Ltd | Electric insulating composition |
JP2002245866A (en) | 2001-02-20 | 2002-08-30 | Hitachi Cable Ltd | Cable for x-ray |
JP2002363361A (en) * | 2001-06-04 | 2002-12-18 | Fujikura Ltd | Transparent resin composition and transparent insulating sheet |
JP2007055864A (en) | 2005-08-26 | 2007-03-08 | National Institute Of Advanced Industrial & Technology | Piezoelectric ceramic composition |
-
2008
- 2008-03-04 JP JP2009502583A patent/JPWO2008108355A1/en active Pending
- 2008-03-04 EP EP08721240A patent/EP2117010A4/en not_active Withdrawn
- 2008-03-04 WO PCT/JP2008/053820 patent/WO2008108355A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0497169A2 (en) * | 1991-01-30 | 1992-08-05 | Felten & Guilleaume Energietechnik AG | X-ray line |
DE19641396A1 (en) * | 1996-09-27 | 1998-04-02 | Siemens Ag | Flexible insulation for high voltage electric cable or wire with high and migration resistance |
Non-Patent Citations (1)
Title |
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See also references of WO2008108355A1 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2584568A1 (en) * | 2010-06-18 | 2013-04-24 | Swcc Showa Cable Systems Co., Ltd. | Cable for high-voltage electronic devices |
EP2584568A4 (en) * | 2010-06-18 | 2017-05-17 | Swcc Showa Cable Systems Co., Ltd. | Cable for high-voltage electronic devices |
US9165697B2 (en) | 2012-11-20 | 2015-10-20 | Hitachi Metals, Ltd. | Peroxide crosslinked resin composition and electric wire and cable using same |
CN106971768A (en) * | 2017-05-13 | 2017-07-21 | 中天科技装备电缆有限公司 | A kind of new-energy automobile inside high-tension cable and preparation method thereof |
Also Published As
Publication number | Publication date |
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JPWO2008108355A1 (en) | 2010-06-17 |
EP2117010A4 (en) | 2012-06-27 |
WO2008108355A1 (en) | 2008-09-12 |
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