WO2017026039A1 - 直流ケーブル、組成物及び直流ケーブルの製造方法 - Google Patents
直流ケーブル、組成物及び直流ケーブルの製造方法 Download PDFInfo
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- WO2017026039A1 WO2017026039A1 PCT/JP2015/072676 JP2015072676W WO2017026039A1 WO 2017026039 A1 WO2017026039 A1 WO 2017026039A1 JP 2015072676 W JP2015072676 W JP 2015072676W WO 2017026039 A1 WO2017026039 A1 WO 2017026039A1
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- inorganic filler
- base resin
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- polyethylene
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- 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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- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
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Definitions
- One embodiment of the present invention relates to a DC cable, a composition, and a method of manufacturing a DC cable.
- a cross-linked polyethylene cable including a cross-linked polyethylene in an insulating layer covering the outer periphery of the conductive portion is widely used as an AC cable.
- an organic peroxide such as dicumyl peroxide is used.
- Patent Documents 1 and 2 a method of forming an insulating layer containing magnesium oxide or carbon black as an inorganic filler is known (see, for example, Patent Documents 1 and 2).
- JP 2014-218617 A Japanese Patent Laying-Open No. 2015-883
- An object of one embodiment of the present invention is to provide a DC cable that is excellent in long-term DC insulation performance and space charge characteristics of an insulating layer in view of the above-described problems of the related art.
- One aspect of the present invention is a DC cable in which an outer periphery of a conductive portion is covered with an insulating layer, and an outer periphery of the conductive portion is covered with an insulating layer, and the insulating layer includes a cross-linked product of a base resin, Inorganic filler is included, the base resin includes polyethylene, the inorganic filler has a BET specific surface area of 5 m 2 / g or more, a volume average particle size of 5 ⁇ m or less, and the inorganic filler to the base resin The mass ratio of the agent is 0.001 or more and 0.05 or less, and the crosslinked product of the base resin is crosslinked with a crosslinking agent containing an organic peroxide.
- the composition includes a base resin, an inorganic filler, and a crosslinking agent
- the base resin includes polyethylene
- the inorganic filler has a BET specific surface area of 5 m 2 / g or more.
- the volume average particle size is 5 ⁇ m or less
- the mass ratio of the inorganic filler to the base resin is 0.001 or more and 0.05 or less
- the crosslinking agent contains an organic peroxide.
- a DC cable excellent in long-term DC insulation performance and space charge characteristics of an insulating layer can be provided.
- FIG. 1 shows an example of a DC cable.
- FIG. 1 is a cross-sectional view orthogonal to the axial direction of the DC cable 1.
- the outer periphery of the conductive portion 10 is covered with an insulating layer 20.
- an internal semiconductive layer 11 is formed between the conductive portion 10 and the insulating layer 20.
- the outer periphery of the insulating layer 20 is covered with the shielding layer 30, and the outer periphery of the shielding layer 30 is covered with the covering layer 40.
- an external semiconductive layer 21 is formed between the insulating layer 20 and the shielding layer 30.
- the conductive portion 10 has a plurality of conductive core wires twisted together.
- the material constituting the conductive core wire is not particularly limited, and examples thereof include copper, aluminum, copper alloy, and aluminum alloy.
- the material constituting the inner semiconductive layer 11 is not particularly limited, and examples thereof include an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, and an ethylene-butyl acrylate copolymer.
- the insulating layer 20 contains a cross-linked product of a base resin and an inorganic filler.
- the base resin includes polyethylene.
- Polyethylene may be any of low density, medium density and high density. Further, the polyethylene may be either linear or branched.
- the cross-linked product of the base resin is cross-linked with a cross-linking agent containing an organic peroxide.
- the organic peroxide is not particularly limited, but dicumyl peroxide, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane, 1,3-bis (t-butylperoxyisopropyl) Examples include benzene.
- the base resin may further contain a copolymer of ethylene and a polar monomer or maleic anhydride grafted polyethylene. Thereby, the long-term DC insulation performance and space charge characteristics of the insulating layer 20 can be improved.
- the mass ratio of ethylene / polar monomer copolymer or maleic anhydride grafted polyethylene to polyethylene is usually 1/9 or less, and preferably 5/95 or less. Thereby, the long-term DC insulation performance of the insulating layer 20 can be improved.
- the mass ratio of the copolymer of ethylene and a polar monomer or maleic anhydride grafted polyethylene with respect to polyethylene is usually 0.01 or more.
- the BET specific surface area of the inorganic filler is 5 m 2 / g or more, and preferably 20 m 2 / g or more. When the BET specific surface area of the inorganic filler is less than 5 m 2 / g, the long-term DC insulation performance and space charge characteristics of the insulating layer 20 are degraded. In addition, the BET specific surface area of an inorganic filler is 100 m ⁇ 2 > / g or less normally.
- the volume average particle diameter of the inorganic filler is 5 ⁇ m or less, preferably 2 ⁇ m or less. When the volume average particle diameter of the inorganic filler exceeds 5 ⁇ m, the long-term DC insulation performance and space charge characteristics of the insulating layer 20 are deteriorated.
- the volume average particle size of the inorganic filler is usually 0.5 ⁇ m or more.
- the mass ratio of the inorganic filler to the base resin is 0.001 to 0.05, and preferably 0.005 to 0.03.
- the mass ratio of the inorganic filler to the base resin is less than 0.001 or exceeds 0.05, the long-term DC insulation performance and space charge characteristics of the insulating layer 20 are degraded.
- the inorganic filler is not particularly limited, and examples thereof include magnesium oxide powder, aluminum oxide powder, silica powder, magnesium silicate powder, aluminum silicate powder, and carbon black. Two or more kinds may be used in combination.
- the magnesium oxide powder, aluminum oxide powder, silica powder, magnesium silicate powder, and aluminum silicate powder may be surface-treated with a silane coupling agent. Thereby, the long-term DC insulation performance and space charge characteristics of the insulating layer 20 can be improved.
- the silane coupling agent is not particularly limited, but vinyltrimethoxysilane, vinyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycol.
- the inorganic filler may be pulverized.
- inorganic fillers that are bonded to each other during surface treatment and have a large particle size can be pulverized by jet pulverization.
- the insulating layer 20 may further contain an antioxidant. Thereby, the heat aging resistance of the insulating layer 20 can be improved.
- the antioxidant is not particularly limited, but 2,2-thiodiethylenebis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], pentaerythrityltetrakis [3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate], octadecyl 3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,4-bis (n-octylthiomethyl) -O-cresol, 2,4-bis (n-octylthio) -6- (4-hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine, bis [2-methyl-4- ⁇ 3-n-alkyl (C12 or C14) thiopropionyloxy ⁇ -5-tert-butylphenyl] sulfide, 4,4′-thiobis (3-methyl-6-tert-butyl Phen
- the insulating layer 20 may further contain a lubricant, a colorant and the like.
- the material constituting the outer semiconductive layer 21 is not particularly limited, and examples thereof include an ethylene-vinyl acetate copolymer.
- the material constituting the shielding layer 30 is not particularly limited, and examples thereof include copper.
- the material constituting the coating layer 40 is not particularly limited, and examples thereof include polyvinyl chloride.
- the DC cable 1 can be applied to DC power transmission or the like.
- a base resin, an inorganic filler, a composition containing a crosslinking agent, and a raw material of the outer semiconductive layer 21 are simultaneously extruded on the outer periphery of the conductive portion 10 as a raw material of the inner semiconductive layer 11 and a raw material of the insulating layer 20.
- the base resin is crosslinked by heating to a predetermined temperature to form the inner semiconductive layer 11, the insulating layer 20, and the outer semiconductive layer 21.
- a shielding element 30 is formed by winding a conductive element wire such as a copper tape or an annealed copper wire around the outer periphery of the external semiconductive layer 21.
- the raw material of the covering layer 40 is extruded to form the covering layer 40 on the outer periphery of the shielding layer 30.
- the production method of the composition is not particularly limited, but after kneading a base resin, an inorganic filler, and, if necessary, an antioxidant, a lubricant, a colorant, etc., to produce a pellet, a crosslinking agent is added to the pellet.
- a crosslinking agent examples include heat impregnation.
- composition may be extruded using a screen mesh while removing aggregates.
- the raw material of the inner semiconductive layer 11, the above composition, and the raw material of the outer semiconductive layer 21 may be extruded simultaneously.
- a part means a mass part.
- Example 1 100 parts of low density polyethylene (LDPE) having a density of 0.920 g / mm 3 and a MFR (Melt Flow Rate) of 1 g / 10 min as a base resin, and a BET specific surface area of 30 m 2 / g as an inorganic filler, Heat-kneading 0.1 parts of magnesium oxide powder having a volume average particle size of 0.45 ⁇ m and 0.2 parts of 4,4-thiobis (3-methyl-6-tert-butylphenol) as an antioxidant at about 180 ° C. And pellets were produced. Next, the obtained pellet was impregnated with 2 parts of dicumyl peroxide as a crosslinking agent at about 60 ° C. to obtain a composition.
- LDPE low density polyethylene
- MFR Melt Flow Rate
- Example 2 A composition was obtained in the same manner as in Example 1 except that the amount of the inorganic filler added was changed to 1 part.
- Example 3 A composition was obtained in the same manner as in Example 1 except that the amount of the inorganic filler added was changed to 5 parts.
- Example 4 As the inorganic filler, except that a magnesium oxide powder having a BET specific surface area of 145 m 2 / g and a volume average particle size of 0.50 ⁇ m, which is surface-treated with vinyltrimethoxysilane as a silane coupling agent, A composition was obtained in the same manner as in Example 2.
- Example 5 As the base resin, the density is 0.920g / mm 3, MFR (Melt Flow Rate) LDPE97 parts and density of 1 g / 10min is 0.920g / mm 3, MFR (Melt Flow Rate) is maleic anhydride 1 g / 10min A composition was obtained in the same manner as in Example 4 except that 3 parts of graft polyethylene (MA-g-PE) was used.
- MA-g-PE graft polyethylene
- Example 6 A composition was obtained in the same manner as in Example 5 except that 1.3 parts of 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane was used as a crosslinking agent.
- Example 7 As the inorganic filler, except that magnesium oxide powder having a BET specific surface area of 30 m 2 / g and a volume average particle size of 0.05 ⁇ m, which is surface-treated with vinyltrimethoxysilane as a silane coupling agent, is used. A composition was obtained in the same manner as in Example 6.
- Example 8 As the inorganic filler, except that a magnesium oxide powder surface-treated with vinyltrimethoxysilane as a silane coupling agent and having a BET specific surface area of 8 m 2 / g and a volume average particle diameter of 0.2 ⁇ m is used. A composition was obtained in the same manner as in Example 6.
- the base resin has a density of 0.920 g / mm 3 , an LDPE of 95 parts with an MFR (Melt Flow Rate) of 1 g / 10 min, a density of 0.930 g / mm 3 , an MFR (Melt Flow Rate) of 4 g / 10 min, and ethyl acrylate.
- Example 6 5 parts of ethylene-ethyl acrylate copolymer (poly (E-co-EA)) having a content of structural units derived from 7% by mass is used as an inorganic filler, with a BET specific surface area of 50 m 2 / g, volume A composition was obtained in the same manner as in Example 6 except that silica powder having an average particle size of 0.03 ⁇ m was used.
- poly (E-co-EA) poly (E-co-EA) having a content of structural units derived from 7% by mass
- Example 10 A composition was obtained in the same manner as in Example 6 except that silica powder having a BET specific surface area of 90 m 2 / g and a volume average particle size of 0.02 ⁇ m was used as the inorganic filler.
- Example 11 As a base resin, density is 0.920 g / mm 3 , MFR (Melt Flow Rate) is 1 g / 10 min LDPE 97 parts, density is 0.930 g / mm 3 , MFR (Melt Flow Rate) is 4 g / 10 min, ethyl acrylate
- An alumina powder having 3 parts of poly (E-co-EA) having a constituent unit content of 7% by mass as an inorganic filler and having a BET specific surface area of 120 m 2 / g and a volume average particle size of 0.02 ⁇ m was used in the same manner as in Example 6 except that 1,3-bis (t-butylperoxyisopropyl) benzene was used as a crosslinking agent.
- Example 12 As a base resin, a density of 0.920 g / mm 3 , MFR (Melt Flow Rate) LDPE 93 parts of 1 g / 10 min, a density of 0.930 g / mm 3 , MFR (Melt Flow Rate) 4 g / 10 min, EA concentration 7 Example 6 except that 7 parts by weight poly (E-co-EA) was used, and carbon black having a BET specific surface area of 50 m 2 / g and a volume average particle size of 0.05 ⁇ m was used as an inorganic filler. In the same manner, a composition was obtained.
- Example 13 As inorganic filler, surface treated with vinyltrimethoxysilane as silane coupling agent, 1 part of magnesium oxide powder having a BET specific surface area of 145 m 2 / g and volume average particle size of 0.50 ⁇ m, and BET specific surface area There except that 50 m 2 / g, a volume average particle diameter using silica powder 2 parts of 0.03 .mu.m, in the same manner as in example 6 to obtain a composition.
- Example 14 As inorganic filler, surface treated with vinyltrimethoxysilane as silane coupling agent, BET specific surface area of 145 m 2 / g, volume average particle diameter of 0.50 ⁇ m, 2 parts of magnesium oxide powder and BET specific surface area There except that 120 m 2 / g, a volume average particle diameter was used an alumina powder 3 parts of 0.02 [mu] m, in the same manner as in example 6 to obtain a composition.
- composition was obtained in the same manner as in Example 1 except that the inorganic filler was not used.
- composition was obtained in the same manner as in Example 1 except that the amount of the inorganic filler added was changed to 10 parts.
- Example 3 A composition was obtained in the same manner as in Example 1 except that 2 parts of magnesium oxide powder having a BET specific surface area of 1.4 m 2 / g and a volume average particle size of 3 ⁇ m was used as the inorganic filler.
- Example 4 A composition was obtained in the same manner as in Example 1 except that 2 parts of magnesium oxide powder having a BET specific surface area of 0.5 m 2 / g and a volume average particle size of 17 ⁇ m was used as the inorganic filler.
- Example 5 A composition was obtained in the same manner as in Example 1 except that 2 parts of alumina powder having a BET specific surface area of 4.1 m 2 / g and a volume average particle size of 1.5 ⁇ m was used as the inorganic filler.
- Table 1 shows the characteristics of the inorganic filler contained in the composition.
- Table 2 shows the characteristics of the composition.
- the composition was press-molded to obtain a sheet having a thickness T of 0.15 mm.
- the sheet was immersed in 90 ° C. silicone oil, and a plate electrode having a diameter of 25 mm was used to apply a direct current electric field of 80 kV / mm to the sheet, and the volume resistivity was measured.
- the space charge characteristics of the sheet were evaluated using a PEA space charge measuring device (manufactured by Fibrabo). Specifically, a DC electric field V 0 of 50 kV / mm is continuously applied to the sheet at 30 ° C. for 1 hour under atmospheric pressure, the maximum electric field V 1 inside the sheet is measured, and the formula V 1 / (V 0 x T)
- the electric field enhancement coefficient FEF Field Enhancement Factor defined in (1) was obtained, and the space charge characteristics were evaluated.
- FEF Field Enhancement Factor
- Table 3 shows the evaluation results of the sheet volume resistivity, long-term DC insulation performance and space charge characteristics.
- the sheet made from the composition of Comparative Example 2 has a mass ratio of the inorganic filler to the base resin of 0.1, long-term DC insulation performance and space charge characteristics are degraded.
- the sheet produced from the composition of Comparative Example 4 has a BET specific surface area and a volume average particle size of the inorganic filler of 0.5 m 2 / g and 17 ⁇ m, respectively, the volume resistivity and long-term DC insulation performance And space charge characteristics are degraded.
- a conductive portion 10 was prepared in which conductive core wires made of a diluted copper alloy having a diameter of 14 mm were twisted together.
- the inner semiconductive layer 11 made of an ethylene-ethyl acrylate copolymer, the composition as a raw material for the insulating layer 20 and the outer semiconductive layer 21 made of an ethylene-ethyl acrylate copolymer were simultaneously extruded.
- the base resin is crosslinked by heating at about 250 ° C., and the inner semiconductive layer 11, the insulating layer 20, and the outer A semiconductive layer 21 was formed.
- a shielding element 30 was formed by winding a conductive wire such as an annealed copper wire having a diameter of 1 mm around the outer periphery of the outer semiconductive layer 21. Furthermore, polyvinyl chloride was extruded to form a coating layer 40 having a thickness of 3 mm on the outer periphery of the shielding layer 30, and the DC cable 1 was obtained.
- a conductive wire such as an annealed copper wire having a diameter of 1 mm around the outer periphery of the outer semiconductive layer 21.
- polyvinyl chloride was extruded to form a coating layer 40 having a thickness of 3 mm on the outer periphery of the shielding layer 30, and the DC cable 1 was obtained.
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Abstract
Description
ベース樹脂としての、密度が0.920g/mm3、MFR(Melt Flow Rate)が1g/10minの低密度ポリエチレン(LDPE)100部と、無機充填剤としての、BET比表面積が30m2/g、体積平均粒径が0.45μmの酸化マグネシウム粉末0.1部及び酸化防止剤としての、4,4-チオビス(3-メチル-6-t-ブチルフェノール)0.2部を約180℃で加熱混練し、ペレットを作製した。次に、得られたペレットに、架橋剤としての、ジクミルパーオキサイド2部を約60℃で加熱含浸し、組成物を得た。
無機充填剤の添加量を1部に変更した以外は、実施例1と同様にして、組成物を得た。
無機充填剤の添加量を5部に変更した以外は、実施例1と同様にして、組成物を得た。
無機充填剤として、シランカップリング剤としての、ビニルトリメトキシシランにより表面処理されている、BET比表面積が145m2/g、体積平均粒径が0.50μmの酸化マグネシウム粉末を用いた以外は、実施例2と同様にして、組成物を得た。
ベース樹脂として、密度が0.920g/mm3、MFR(Melt Flow Rate)が1g/10minのLDPE97部及び密度が0.920g/mm3、MFR(Melt Flow Rate)が1g/10minの無水マレイン酸グラフトポリエチレン(MA-g-PE)3部を用いた以外は、実施例4と同様にして、組成物を得た。
架橋剤として、2,5-ジメチル-2,5-ビス(t-ブチルパーオキシ)ヘキサン1.3部を用いた以外は、実施例5と同様にして、組成物を得た。
無機充填剤として、シランカップリング剤としての、ビニルトリメトキシシランにより表面処理されている、BET比表面積が30m2/g、体積平均粒径が0.05μmの酸化マグネシウム粉末を用いた以外は、実施例6と同様にして、組成物を得た。
無機充填剤として、シランカップリング剤としての、ビニルトリメトキシシランにより表面処理されている、BET比表面積が8m2/g、体積平均粒径が0.2μmの酸化マグネシウム粉末を用いた以外は、実施例6と同様にして、組成物を得た。
ベース樹脂として、密度が0.920g/mm3、MFR(Melt Flow Rate)が1g/10minのLDPE95部及び密度が0.930g/mm3、MFR(Melt Flow Rate)が4g/10min、アクリル酸エチル由来の構成単位の含有量が7質量%のエチレン-アクリル酸エチル共重合体(poly(E-co-EA))5部を用い、無機充填剤として、BET比表面積が50m2/g、体積平均粒径が0.03μmのシリカ粉末を用いた以外は、実施例6と同様にして、組成物を得た。
無機充填剤として、BET比表面積が90m2/g、体積平均粒径が0.02μmのシリカ粉末を用いた以外は、実施例6と同様にして、組成物を得た。
ベース樹脂として、密度が0.920g/mm3、MFR(Melt Flow Rate)が1g/10minのLDPE97部及び密度が0.930g/mm3、MFR(Melt Flow Rate)が4g/10min、アクリル酸エチル由来の構成単位の含有量が7質量%のpoly(E-co-EA)3部を用い、無機充填剤として、BET比表面積が120m2/g、体積平均粒径が0.02μmのアルミナ粉末を用い、架橋剤として、1,3-ビス(t-ブチルパーオキシイソプロピル)ベンゼンを用いた以外は、実施例6と同様にして、組成物を得た。
ベース樹脂として、密度が0.920g/mm3、MFR(Melt Flow Rate)が1g/10minのLDPE93部及び密度が0.930g/mm3、MFR(Melt Flow Rate)が4g/10min, EA濃度7%のpoly(E-co-EA)7部を用い、無機充填剤として、BET比表面積が50m2/g、体積平均粒径が0.05μmのカーボンブラックを用いた以外は、実施例6と同様にして、組成物を得た。
無機充填剤として、シランカップリング剤としての、ビニルトリメトキシシランにより表面処理されている、BET比表面積が145m2/g、体積平均粒径が0.50μmの酸化マグネシウム粉末1部及びBET比表面積が50m2/g、体積平均粒径が0.03μmのシリカ粉末2部を用いた以外は、実施例6と同様にして、組成物を得た。
無機充填剤として、シランカップリング剤としての、ビニルトリメトキシシランにより表面処理されている、BET比表面積が145m2/g、体積平均粒径が0.50μmの酸化マグネシウム粉末2部及びBET比表面積が120m2/g、体積平均粒径が0.02μmのアルミナ粉末3部を用いた以外は、実施例6と同様にして、組成物を得た。
無機充填剤を用いなかった以外は、実施例1と同様にして、組成物を得た。
無機充填剤の添加量を10部に変更した以外は、実施例1と同様にして、組成物を得た。
無機充填剤として、BET比表面積が1.4m2/g、体積平均粒径が3μmの酸化マグネシウム粉末2部を用いた以外は、実施例1と同様にして、組成物を得た。
無機充填剤として、BET比表面積が0.5m2/g、体積平均粒径が17μmの酸化マグネシウム粉末2部を用いた以外は、実施例1と同様にして、組成物を得た。
無機充填剤として、BET比表面積が4.1m2/g、体積平均粒径が1.5μmのアルミナ粉末2部を用いた以外は、実施例1と同様にして、組成物を得た。
90℃のシリコーンオイル中にシートを浸漬し、直径が25mmの平板電極を用いて、80kV/mmの直流電界をシートに印加し、体積抵抗率を測定した。
シートを用いて、90℃のシリコーンオイル中にシートを浸漬し、直径が25mmの平板電極を用いて、10~300kV/mmの直流電界V0[kV/mm]をシートに印加することにより、シートが絶縁破壊するまでの時間t[h]を測定し、V-t曲線を求めた。次に、式
V0 n×t=const.
により、寿命指数nを求め、長期的な直流絶縁性能を評価した。なお、nが20以上である場合を◎、15以上20未満である場合を○、15未満である場合を×として、判定した。
PEA空間電荷測定装置(ファイブラボ社製)を用いて、シートの空間電荷特性を評価した。具体的には、大気圧下、30℃で1時間に亘って50kV/mmの直流電界V0をシートに連続印加し、シートの内部の最大電界V1を測定し、式
V1/(V0×T)
で定義される電界強調係数FEF(Field Enhancement Factor)を求め、空間電荷特性を評価した。なお、FEFが1.15未満である場合を○、1.15以上である場合を×として、判定した。
まず、直径が14mmの希薄銅合金製の導電芯線が撚り合わされている導電部10を用意した。次に、エチレン-アクリル酸エチル共重合体からなる内部半導電層11、絶縁層20の原材料としての組成物及びエチレン-アクリル酸エチル共重合体からなる外部半導電層21を同時に押出成形して、導電部10の外周に、厚さがそれぞれ1mm、14mm及び1mmとなるように成形した後、約250℃で加熱して、ベース樹脂を架橋し、内部半導電層11、絶縁層20及び外部半導電層21を形成した。次に、外部半導電層21の外周に、直径が1mmの軟銅線等の導電素線を巻き付けて、遮蔽層30を形成した。さらに、ポリ塩化ビニルを押出成形して、遮蔽層30の外周に厚さが3mmの被覆層40を形成し、直流ケーブル1を得た。
10 導電部
11 内部半導電層
20 絶縁層
21 外部半導電層
30 遮蔽層
40 被覆層
Claims (9)
- 導電部の外周が絶縁層により覆われている直流ケーブルであって、
前記絶縁層は、ベース樹脂の架橋物と、無機充填剤を含み、
前記ベース樹脂は、ポリエチレンを含み、
前記無機充填剤は、BET比表面積が5m2/g以上であり、体積平均粒径が5μm以下であり、
前記ベース樹脂に対する前記無機充填剤の質量比が0.001以上0.05以下であり、
前記ベース樹脂の架橋物は、有機過酸化物を含む架橋剤により架橋されていることを特徴とする直流ケーブル。 - 前記無機充填剤は、酸化マグネシウム粉末、酸化アルミニウム粉末、シリカ粉末、ケイ酸マグネシウム粉末、ケイ酸アルミニウム粉末及びカーボンブラックからなる群より選択される一種以上であることを特徴とする請求項1に記載の直流ケーブル。
- 前記酸化マグネシウム粉末、前記酸化アルミニウム粉末、前記シリカ粉末、前記ケイ酸マグネシウム粉末、前記ケイ酸アルミニウム粉末は、シランカップリング剤により表面処理されていることを特徴とする請求項2に記載の直流ケーブル。
- 前記ベース樹脂は、エチレンと極性モノマーの共重合体又は無水マレイン酸グラフトポリエチレンをさらに含み、
前記ポリエチレンに対する前記エチレンと極性モノマーの共重合体又は無水マレイン酸グラフトポリエチレンの質量比が1/9以下であることを特徴とする請求項1に記載の直流ケーブル。 - ベース樹脂と、無機充填剤と、架橋剤を含み、
前記ベース樹脂は、ポリエチレンを含み、
前記無機充填剤は、BET比表面積が5m2/g以上であり、体積平均粒径が5μm以下であり、
前記ベース樹脂に対する前記無機充填剤の質量比が0.001以上0.05以下であり、
前記架橋剤は、有機過酸化物を含むことを特徴とする組成物。 - 前記無機充填剤は、酸化マグネシウム粉末、酸化アルミニウム粉末、シリカ粉末、ケイ酸マグネシウム粉末、ケイ酸アルミニウム粉末及びカーボンブラックからなる群より選択される一種以上であることを特徴とする請求項5に記載の組成物。
- 前記酸化マグネシウム粉末、前記酸化アルミニウム粉末、前記シリカ粉末、前記ケイ酸マグネシウム粉末、前記ケイ酸アルミニウム粉末は、シランカップリング剤により表面処理されていることを特徴とする請求項6に記載の組成物。
- 前記ベース樹脂は、エチレンと極性モノマーの共重合体又は無水マレイン酸グラフトポリエチレンをさらに含み、
前記ポリエチレンに対する前記エチレンと極性モノマーの共重合体又は無水マレイン酸グラフトポリエチレンの質量比が1/9以下であることを特徴とする請求項5に記載の組成物。 - 導電部の外周が絶縁層により覆われている直流ケーブルを製造する方法であって、
請求項5に記載の組成物を押出成形して、前記導電部の外周を覆い、押出成形物を作製する工程と、
該押出成形物を所定の温度で加熱して、前記ベース樹脂を架橋し、前記絶縁層を形成する工程を有することを特徴とする直流ケーブルの製造方法。
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PCT/JP2015/072676 WO2017026039A1 (ja) | 2015-08-10 | 2015-08-10 | 直流ケーブル、組成物及び直流ケーブルの製造方法 |
US15/747,324 US20180218804A1 (en) | 2015-08-10 | 2015-08-10 | Direct-current cable, composition and method of manufacturing direct-current cable |
CN201580082234.8A CN108028098A (zh) | 2015-08-10 | 2015-08-10 | 直流电缆、组合物以及直流电缆的制造方法 |
EP15900993.5A EP3336857A4 (en) | 2015-08-10 | 2015-08-10 | Dc cable, composition, and method for manufacturing dc cable |
KR1020187003004A KR20180039635A (ko) | 2015-08-10 | 2015-08-10 | 직류 케이블, 조성물 및 직류 케이블의 제조 방법 |
US15/531,104 US10643763B2 (en) | 2015-08-10 | 2016-08-05 | Direct-current cable, composition and method of manufacturing direct-current cable |
JP2017534409A JPWO2017026391A1 (ja) | 2015-08-10 | 2016-08-05 | 直流ケーブル、組成物及び直流ケーブルの製造方法 |
PCT/JP2016/073095 WO2017026391A1 (ja) | 2015-08-10 | 2016-08-05 | 直流ケーブル、組成物及び直流ケーブルの製造方法 |
CN201680004492.9A CN107112089B (zh) | 2015-08-10 | 2016-08-05 | 直流电缆、组合物以及直流电缆的制造方法 |
EP16835088.2A EP3336858B1 (en) | 2015-08-10 | 2016-08-05 | Dc cable, and method for manufacturing composition and dc cable |
KR1020177013412A KR20180042822A (ko) | 2015-08-10 | 2016-08-05 | 직류 케이블, 조성물 및 직류 케이블의 제조 방법 |
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EP (2) | EP3336857A4 (ja) |
JP (1) | JPWO2017026391A1 (ja) |
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CN110520940A (zh) * | 2017-04-12 | 2019-11-29 | Ls电线有限公司 | 直流电力电缆 |
CN111292875A (zh) * | 2018-12-07 | 2020-06-16 | Ls电线有限公司 | 绝缘组合物及具有由该绝缘组合物形成的绝缘层的直流电力电缆 |
JP2020518971A (ja) * | 2017-06-22 | 2020-06-25 | エルエス ケーブル アンド システム リミテッド. | 直流電力ケーブル |
WO2024095407A1 (en) | 2022-11-02 | 2024-05-10 | Sumitomo Electric Industries, Ltd. | Resin composition, pellet, power cable, and method for manufacturing power cable |
EP4386780A1 (en) | 2022-11-02 | 2024-06-19 | Sumitomo Electric Industries, Ltd. | Resin composition, pellet, power cable, and method for manufacturing power cable |
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ES2926814T3 (es) * | 2017-10-12 | 2022-10-28 | Prysmian Spa | Cable eléctrico con capa aislante termoplástica mejorada |
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- 2015-08-10 US US15/747,324 patent/US20180218804A1/en not_active Abandoned
- 2015-08-10 KR KR1020187003004A patent/KR20180039635A/ko unknown
- 2015-08-10 CN CN201580082234.8A patent/CN108028098A/zh active Pending
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2016
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- 2016-08-05 KR KR1020177013412A patent/KR20180042822A/ko unknown
- 2016-08-05 WO PCT/JP2016/073095 patent/WO2017026391A1/ja active Application Filing
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CN110520940A (zh) * | 2017-04-12 | 2019-11-29 | Ls电线有限公司 | 直流电力电缆 |
JP2020517061A (ja) * | 2017-04-12 | 2020-06-11 | エルエス ケーブル アンド システム リミテッド. | 直流電力ケーブル |
JP2022009935A (ja) * | 2017-04-12 | 2022-01-14 | エルエス ケーブル アンド システム リミテッド. | 直流電力ケーブル |
JP2020518971A (ja) * | 2017-06-22 | 2020-06-25 | エルエス ケーブル アンド システム リミテッド. | 直流電力ケーブル |
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JP2022037067A (ja) * | 2017-06-22 | 2022-03-08 | エルエス ケーブル アンド システム リミテッド. | 直流電力ケーブル |
CN111292875A (zh) * | 2018-12-07 | 2020-06-16 | Ls电线有限公司 | 绝缘组合物及具有由该绝缘组合物形成的绝缘层的直流电力电缆 |
CN111292875B (zh) * | 2018-12-07 | 2021-07-23 | Ls电线有限公司 | 绝缘组合物及具有由该绝缘组合物形成的绝缘层的直流电力电缆 |
WO2024095407A1 (en) | 2022-11-02 | 2024-05-10 | Sumitomo Electric Industries, Ltd. | Resin composition, pellet, power cable, and method for manufacturing power cable |
EP4386780A1 (en) | 2022-11-02 | 2024-06-19 | Sumitomo Electric Industries, Ltd. | Resin composition, pellet, power cable, and method for manufacturing power cable |
Also Published As
Publication number | Publication date |
---|---|
EP3336857A1 (en) | 2018-06-20 |
US20170330645A1 (en) | 2017-11-16 |
EP3336857A4 (en) | 2018-09-05 |
US20180218804A1 (en) | 2018-08-02 |
CN108028098A (zh) | 2018-05-11 |
CN107112089A (zh) | 2017-08-29 |
KR20180042822A (ko) | 2018-04-26 |
CN107112089B (zh) | 2019-07-05 |
JPWO2017026391A1 (ja) | 2018-05-31 |
EP3336858A1 (en) | 2018-06-20 |
US10643763B2 (en) | 2020-05-05 |
EP3336858A4 (en) | 2018-08-22 |
EP3336858B1 (en) | 2024-10-09 |
WO2017026391A1 (ja) | 2017-02-16 |
KR20180039635A (ko) | 2018-04-18 |
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