JP6892368B2 - How to make an electric cable - Google Patents
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- JP6892368B2 JP6892368B2 JP2017200950A JP2017200950A JP6892368B2 JP 6892368 B2 JP6892368 B2 JP 6892368B2 JP 2017200950 A JP2017200950 A JP 2017200950A JP 2017200950 A JP2017200950 A JP 2017200950A JP 6892368 B2 JP6892368 B2 JP 6892368B2
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- 238000005187 foaming Methods 0.000 claims description 80
- 239000006260 foam Substances 0.000 claims description 62
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 52
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 52
- 229920000642 polymer Polymers 0.000 claims description 34
- 238000004519 manufacturing process Methods 0.000 claims description 30
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 26
- 239000011342 resin composition Substances 0.000 claims description 23
- 239000004088 foaming agent Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 19
- 239000004156 Azodicarbonamide Substances 0.000 claims description 18
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 18
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 18
- 239000004020 conductor Substances 0.000 claims description 13
- 239000004698 Polyethylene Substances 0.000 claims description 12
- 229920000573 polyethylene Polymers 0.000 claims description 12
- 229920005601 base polymer Polymers 0.000 claims description 11
- 239000012212 insulator Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- -1 polyethylene Polymers 0.000 claims description 9
- 239000004793 Polystyrene Substances 0.000 claims description 7
- 229920002223 polystyrene Polymers 0.000 claims description 6
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 5
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 3
- 238000010097 foam moulding Methods 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 30
- 229910021529 ammonia Inorganic materials 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000000465 moulding Methods 0.000 description 9
- 239000004743 Polypropylene Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 229920001155 polypropylene Polymers 0.000 description 8
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 5
- 229920001684 low density polyethylene Polymers 0.000 description 5
- 239000004702 low-density polyethylene Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 2
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-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
- 101000969770 Homo sapiens Myelin protein zero-like protein 2 Proteins 0.000 description 1
- 102100021272 Myelin protein zero-like protein 2 Human genes 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000002781 deodorant agent Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000005042 ethylene-ethyl acrylate Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001296 polysiloxane Chemical class 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000004718 silane crosslinked polyethylene Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 238000004804 winding Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Manufacturing Of Electric Cables (AREA)
Description
本発明は、電気ケーブルの製造方法に関する。 The present invention relates to a process for the production of electric cable.
電気ケーブルとして、例えば、３本のケーブル線心と、この３本のケーブル線心の撚り合せ間隙に充填された、発泡した架橋エチレン−プロピレン（ＥＰ）ゴム組成物からなる充実介在（以下、「発泡介在物」という）と、それらの外周に施されたシースとを含む電気ケーブルが提案されている（特許文献１参照）。 As an electric cable, for example, a solid interposition composed of three cable cores and a foamed crosslinked ethylene-propylene (EP) rubber composition filled in the twisted gaps of the three cable cores (hereinafter, "" An electric cable including "foam inclusions") and a sheath provided on the outer periphery thereof has been proposed (see Patent Document 1).
この電気ケーブルによれば、３本のケーブル線心の撚り合せ間隙に発泡介在物を押出により充填することによって断面を円形にし、かつ、発泡により屈曲性が良くなるとしている。 According to this electric cable, the twisted gaps of the three cable cores are filled with foam inclusions by extrusion to make the cross section circular, and the foaming improves the flexibility.
一方、この電気ケーブルでは、発泡した架橋ＥＰゴム組成物からなる発泡介在物の製造において、発泡介在物の成形温度で吸着した水を放出する含水充填材、あるいは発泡介在物の成形温度で結晶水を放出する結晶水含有充填材を用い、この放出される水によってＥＰゴムを発泡させることができるとしている。 On the other hand, in this electric cable, in the production of foamed inclusions made of foamed crosslinked EP rubber composition, a water-containing filler that releases adsorbed water at the molding temperature of the foamed inclusions, or crystalline water at the molding temperature of the foamed inclusions. It is said that EP rubber can be foamed by the discharged water by using a filler containing crystalline water that releases.
この場合、未架橋のＥＰゴム組成物中に、組成物の重量当たり１０００ｐｐｍ〜５０００ｐｐｍの水を分散させるとしている。 In this case, 1000 ppm to 5000 ppm of water per weight of the composition is dispersed in the uncrosslinked EP rubber composition.
しかし、この電気ケーブルによれば、発泡介在物の成形温度で吸着した水を放出する含水充填材、あるいは発泡介在物の成形温度で結晶水を放出する結晶水含有充填材を用いて発泡介在物を製造するための吸着水量あるいは結晶水量の調整が困難であることから、発泡介在物の発泡度の制御が困難になっている。 However, according to this electric cable, a water-containing filler that releases water adsorbed at the molding temperature of the foam inclusion, or a water-containing filler that releases water of crystallization at the molding temperature of the foam inclusion is used. Since it is difficult to adjust the amount of adsorbed water or the amount of water of crystallization for producing the above, it is difficult to control the degree of foaming of the foamed inclusions.
一方、本発明者らは、水以外の発泡剤として、安価で発泡効率の良いアゾジカルボンアミド（ＡＤＣＡ）を用いたところ、ＡＤＣＡは分解してアンモニア臭を発生するという知見を得た。 On the other hand, the present inventors have obtained the finding that when azodicarbonamide (ADCA), which is inexpensive and has good foaming efficiency, is used as a foaming agent other than water, ADCA decomposes to generate an ammonia odor.
そこで、本発明の目的は、発泡介在物の発泡度の制御が容易であり、かつ、発泡剤として安価で発泡効率の良いＡＤＣＡを用いたとしてもアンモニア臭を発生しない電気ケーブル及びその製造方法を提供することにある。 Therefore, an object of the present invention is to provide an electric cable and a method for producing the same, which can easily control the degree of foaming of the foaming inclusions and does not generate an ammonia odor even if ADCA, which is inexpensive and has good foaming efficiency, is used as the foaming agent. To provide.
本発明は、上記目的を達成するために、下記の電気ケーブル及びその製造方法を提供する。 The present invention provides the following electric cable and a method for manufacturing the same in order to achieve the above object.
［１］導体、及び前記導体を被覆する絶縁体を含む複数のケーブル線心と、前記複数のケーブル線心の間隙に介在する発泡介在物と、前記複数のケーブル線心、及び前記発泡介在物を一括被覆するシースと、を備えた電気ケーブルの製造方法であって、前記発泡介在物は、エチレン酢酸ビニル共重合体（ＥＶＡ）を４０質量％以上含有する樹脂組成物と、ベースポリマとしてエチレン酢酸ビニル共重合体（ＥＶＡ）、ポリエチレン及びポリスチレンから選ばれる１種以上を含む発泡用マスターバッチとを使用して発泡成形されたものであって、発泡度が３５％以上であり、直径２５０μｍ以上の大径泡及び直径２００μｍ以下の小径泡を有することを特徴とする電気ケーブルの製造方法。
［２］前記樹脂組成物は、前記ＥＶＡの他に、ＥＶＡ以外の１種以上のポリマを含有することを特徴とする前記［１］に記載の電気ケーブルの製造方法。
［３］前記発泡用マスターバッチは、発泡剤としてアゾジカルボンアミド（ＡＤＣＡ）を含有することを特徴とする前記［１］又は［２］に記載の電気ケーブルの製造方法。
［４］前記発泡介在物は、前記発泡用マスターバッチを２種以上使用して発泡成形されたものであることを特徴とする前記［１］〜［３］のいずれか１つに記載の電気ケーブルの製造方法。
［５］前記１種以上のポリマは、融点１００℃以上のポリマであることを特徴とする前記［２］に記載の電気ケーブルの製造方法。
［６］前記樹脂組成物に含有される前記ＥＶＡは、２種以上のＥＶＡの混合物であることを特徴とする前記［１］〜［５］のいずれか１つに記載の電気ケーブルの製造方法。
［７］前記樹脂組成物に含有される前記ＥＶＡは、酢酸ビニル含量が５質量％以上５０質量％未満であることを特徴とする前記［１］〜［６］のいずれか１つに記載の電気ケーブルの製造方法。
［８］前記発泡介在物の発泡成形時における前記樹脂組成物と前記発泡用マスターバッチの混合割合は、前記樹脂組成物１００質量部に対して前記発泡用マスターバッチ中の発泡剤が１質量部以下となる割合であることを特徴とする前記［１］〜［７］のいずれか１つに記載の電気ケーブルの製造方法。
［９］前記大径泡及び／又は前記小径泡は、泡同士が合一した連続泡と、泡同士が合一していない独立泡とからなり、横断面積比率で連続泡：独立泡＝７０％〜１０％：３０％〜９０％であることを特徴とする前記［１］〜［８］のいずれか１つに記載の電気ケーブルの製造方法。
［１０］前記絶縁体は、架橋ポリエチレンからなることを特徴とする前記［１］〜［９］のいずれか１つに記載の電気ケーブルの製造方法。
[ 1 ] A plurality of cable cores including a conductor and an insulator covering the conductor, foam inclusions interposed in the gaps between the plurality of cable cores, the plurality of cable cores, and the foam inclusions. A method for producing an electric cable including a sheath for collectively coating the above, wherein the foaming inclusion is a resin composition containing 40% by mass or more of ethylene-vinyl acetate copolymer (EVA) and ethylene as a base polymer. vinyl acetate copolymer (EVA), be one that is foamed molded using a foaming masterbatch containing one or more selected from polyethylene and polystyrene state, and are foaming degree is 35% or more, the diameter 250μm method of manufacturing an electrical cable, characterized in Rukoto that having a more large径泡and diameter 200μm or less of the small diameter bubbles.
[ 2 ] The method for producing an electric cable according to the above [1 ], wherein the resin composition contains one or more polymers other than EVA in addition to the EVA.
[ 3 ] The method for producing an electric cable according to the above [1 ] or [ 2 ], wherein the masterbatch for foaming contains azodicarbonamide (ADCA) as a foaming agent.
[ 4 ] The electricity according to any one of the above [1] to [ 3 ], wherein the foaming inclusion is foam-molded using two or more kinds of the foaming master batches. Cable manufacturing method.
[ 5 ] The method for manufacturing an electric cable according to the above [2 ], wherein the one or more kinds of polymers are polymers having a melting point of 100 ° C. or higher.
[ 6 ] The method for producing an electric cable according to any one of the above [1] to [ 5 ], wherein the EVA contained in the resin composition is a mixture of two or more kinds of EVA. ..
[ 7 ] The EVA contained in the resin composition according to any one of the above [1] to [ 6 ], wherein the vinyl acetate content is 5% by mass or more and less than 50% by mass. How to make an electric cable.
[ 8 ] The mixing ratio of the resin composition and the foaming masterbatch at the time of foam molding of the foaming inclusions is 1 part by mass of the foaming agent in the foaming masterbatch with respect to 100 parts by mass of the resin composition. The method for manufacturing an electric cable according to any one of the above [1] to [ 7 ], wherein the ratio is as follows.
[9] The large-diameter bubbles and / or the small-diameter bubbles are composed of continuous bubbles in which bubbles are united and independent bubbles in which bubbles are not united, and continuous bubbles: independent bubbles = 70 in a cross-sectional area ratio. % To 10%: The method for manufacturing an electric cable according to any one of the above [1] to [8], wherein the content is 30% to 90%.
[10] The method for manufacturing an electric cable according to any one of the above [1] to [9], wherein the insulator is made of cross-linked polyethylene.
本発明によれば、発泡介在物の発泡度の制御が容易であり、かつ、発泡剤として安価で発泡効率の良いＡＤＣＡを用いたとしてもアンモニア臭を発生しない電気ケーブル及びその製造方法を提供することができる。 According to the present invention, there is provided an electric cable and a method for producing the same, which can easily control the degree of foaming of the foaming inclusions and does not generate an ammonia odor even when ADCA, which is inexpensive and has good foaming efficiency, is used as the foaming agent. be able to.
図１は本発明の実施の形態に係る電気ケーブルの一例を示す横断面図であり、図２は図１における発泡介在物の部分拡大図である。以下、図１及び図２を参照しつつ、本発明の実施の形態を説明する。 FIG. 1 is a cross-sectional view showing an example of an electric cable according to an embodiment of the present invention, and FIG. 2 is a partially enlarged view of a foam inclusion in FIG. Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.
本発明の実施の形態に係る電気ケーブルの製造方法は、導体１及び導体１を被覆する絶縁体２を含む複数のケーブル線心３と、複数のケーブル線心３の間隙に介在する発泡介在物５と、複数のケーブル線心３及び発泡介在物５を一括被覆するシース６と、を備えた電気ケーブル１０の製造方法であって、発泡介在物５は、エチレン酢酸ビニル共重合体（ＥＶＡ）を４０質量％以上含有する樹脂組成物と、ベースポリマとしてエチレン酢酸ビニル共重合体（ＥＶＡ）、ポリエチレン及びポリスチレンから選ばれる１種以上を含む発泡用マスターバッチとを使用して発泡成形されたものであって、発泡度が２０％以上であることを特徴とする。
In the method for manufacturing an electric cable according to an embodiment of the present invention, a plurality of
図１に示す本発明の実施の形態に係る電気ケーブル１０は、三心ＣＶケーブルであり、導体１の周囲に架橋ポリエチレンからなる絶縁体２が被覆されたケーブル線心３を３本撚り合せた撚り合せコア４と断面円形のシース６との間隙に、発泡した押出介在物からなる発泡介在物５が充填されている。
The electric cable 10 according to the embodiment of the present invention shown in FIG. 1 is a three-core CV cable, and three
導体１の材料は特に限定されず、既知の材料を用いて形成することができる。導体１は、１本である場合に限られず、複数本の素線を撚合せたものであってもよい。絶縁体２の材料は、特に限定されず、種々の材料を用いて形成することができるが、架橋ポリエチレンであることが好ましい。 The material of the conductor 1 is not particularly limited, and can be formed by using a known material. The conductor 1 is not limited to one, and may be a twisted plurality of conductors. The material of the insulator 2 is not particularly limited and can be formed by using various materials, but cross-linked polyethylene is preferable.
図１に示す撚り合せた撚り合せコア４は、３本のケーブル線心３を撚り合せた実施形態であるが、ケーブル線心３は３本以外の複数本（２本又は４本以上）であってもよく、また、撚り合せたものに限られない。
The twisted twisted core 4 shown in FIG. 1 is an embodiment in which three
シース６の材料は特に限定されず、既知の材料を用いて形成することができる。塩化ビニル（ＰＶＣ）やハロゲンフリー難燃性樹脂を用いることが好ましい。 The material of the sheath 6 is not particularly limited, and can be formed by using a known material. It is preferable to use vinyl chloride (PVC) or a halogen-free flame-retardant resin.
発泡介在物５は、ＥＶＡを主体とするポリマ構成の発泡体からなっているので屈曲性と伸縮性に富み、かつ耐寒性が優れている。従って、この発泡介在物５が形成された電気ケーブル１０は、屈曲性に優れるだけでなく、低温取扱い時の外部からの衝撃に対する緩衝性も高くなっている。 Since the foam inclusions 5 are made of a polymer-structured foam mainly composed of EVA, they are highly flexible and stretchable, and have excellent cold resistance. Therefore, the electric cable 10 on which the foam inclusions 5 are formed is not only excellent in flexibility, but also has high cushioning property against an external impact during low-temperature handling.
発泡介在物５は、ＥＶＡを４０質量％以上含有する樹脂組成物（以下、「介在用ポリマ」と言うことがある）と、ベースポリマとしてエチレン酢酸ビニル共重合体（ＥＶＡ）、ポリエチレン（ＰＥ）及びポリスチレン（ＰＳ）から選ばれる１種以上を含む発泡用マスターバッチとを使用して発泡成形されたものであって、発泡度が３５％以上である。発泡度は４０％以上であることが好ましく、４５％以上であることがより好ましい。また、発泡度は７０％以下であることが望ましい。 The foam inclusions 5 are a resin composition containing 40% by mass or more of EVA (hereinafter, may be referred to as “interposition polymer”), ethylene vinyl acetate copolymer (EVA), and polyethylene (PE) as base polymers. It is foam-molded using a masterbatch for foaming containing at least one selected from polystyrene (PS) and has a degree of foaming of 35% or more. The degree of foaming is preferably 40% or more, and more preferably 45% or more. Further, the degree of foaming is preferably 70% or less.
上記樹脂組成物（介在用ポリマ）は、ＥＶＡを４５質量％以上１００質量％以下含有していることが好ましく、５０質量％以上１００質量％以下含有していることがより好ましく、５５質量％以上１００質量％以下含有していることがさらに好ましい。 The resin composition (polymer for interposition) preferably contains EVA in an amount of 45% by mass or more and 100% by mass or less, more preferably 50% by mass or more and 100% by mass or less, and 55% by mass or more. It is more preferable that the content is 100% by mass or less.
ここで使用するＥＶＡは、酢酸ビニル含量（ＶＡ量）が５質量％以上５０質量％未満となるものが、耐寒性及び屈曲性の観点から好ましい。成形時の粘着性を考慮するならば、ＶＡ量を１０質量％以上４５質量％以下に調整したほうが良い。ＥＶＡは、１種であっても、２種以上のＥＶＡの混合物であってもよい。 The EVA used here preferably has a vinyl acetate content (VA amount) of 5% by mass or more and less than 50% by mass from the viewpoint of cold resistance and flexibility. Considering the adhesiveness at the time of molding, it is better to adjust the amount of VA to 10% by mass or more and 45% by mass or less. EVA may be one kind or a mixture of two or more kinds of EVA.
上記樹脂組成物（介在用ポリマ）は、ＥＶＡの他に、ＥＶＡ以外の１種以上のポリマを含有することが好ましい。短時間冷却による発泡ＥＶＡの形状安定化やＥＶＡとの融点差異効果がもたらす、コア−介在物間の剥離性付与の観点から、ＥＶＡと他の１種以上のポリマをブレンドすることが望ましい。具体的にはポリエチレン（ＰＥ）、低密度ポリエチレン（ＬＤＰＥ）、エチレン−エチルアクリレート共重合体（ＥＥＡ）、ポリプロピレン（ＰＰ）或いはその他のポリオレフィン類などが挙げられる。その融点は１００℃以上であることが好ましい。ＰＥを例にするならば、ＥＶＡ６０質量〜９９質量％、ＰＥ１質量〜４０質量％のブレンド割合とすることが屈曲性や耐寒性の観点から好ましい。 The resin composition (intervening polymer) preferably contains one or more polymers other than EVA in addition to EVA. It is desirable to blend EVA with one or more other polymers from the viewpoint of stabilizing the shape of the foamed EVA by cooling for a short time and imparting peelability between the core and inclusions, which is brought about by the effect of different melting points from EVA. Specific examples thereof include polyethylene (PE), low density polyethylene (LDPE), ethylene-ethyl acrylate copolymer (EEA), polypropylene (PP) and other polyolefins. Its melting point is preferably 100 ° C. or higher. Taking PE as an example, it is preferable to use a blend ratio of 60% by mass to 99% by mass of EVA and 1% by mass to 40% by mass of PE from the viewpoint of flexibility and cold resistance.
上記樹脂組成物（介在用ポリマ）は、上記のＥＶＡや、ＥＶＡ以外の１種以上のポリマの他に、添加剤を含有していてもよい。添加剤はケーブルのコアの露出作業性を改良できる点で好ましいが、本発明の効果である屈曲性や耐寒性に悪影響を及ぼさない範囲内で添加する。具体的な添加剤としては、一般に流通している無機系充填剤が挙げられる。より具体的には、炭酸カルシウムや焼成クレー、タルクなど安価なものが良い。 The resin composition (intervening polymer) may contain an additive in addition to the above-mentioned EVA and one or more polymers other than EVA. The additive is preferable because it can improve the exposure workability of the core of the cable, but it is added within a range that does not adversely affect the flexibility and cold resistance which are the effects of the present invention. Specific examples of the additive include inorganic fillers that are generally distributed. More specifically, inexpensive substances such as calcium carbonate, calcined clay, and talc are preferable.
上記発泡用マスターバッチは、アゾジカルボンアミド（ＡＤＣＡ）やｐ，ｐ'−オキシビスベンゼンスルホニルヒドラジド（ＯＢＳＨ）などの発泡剤がベースポリマに高濃度添加されているものをいう。ベースポリマとしては、ＰＥ、ＰＰ、ＰＶＣ、ＰＳ、ＡＢＳ、ＰＳ、ＥＶＡがあるが、このうちＥＶＡ、ＰＥ、ＰＳのいずれか1種以上で構成されていることが好ましい。 The masterbatch for foaming refers to a masterbatch in which a foaming agent such as azodicarbonamide (ADCA) or p, p'-oxybisbenzenesulfonylhydrazide (OBSH) is added in a high concentration to the base polymer. Examples of the base polymer include PE, PP, PVC, PS, ABS, PS, and EVA, and it is preferable that the base polymer is composed of any one or more of EVA, PE, and PS.
発泡剤は、ＡＤＣＡ又はＯＢＳＨであることが好ましく、また、これらを併用することも好ましい。ＡＤＣＡやＯＢＳＨと、その他の発泡剤を併用してもよい。 The foaming agent is preferably ADCA or OBSH, and it is also preferable to use these in combination. ADCA or OBSH may be used in combination with other foaming agents.
発泡用マスターバッチ中の発泡剤の濃度が１０〜５０質量％の範囲内にあるものが取扱いの観点からよく、２０〜４０質量％としたものがさらに取扱いやすい。 The concentration of the foaming agent in the masterbatch for foaming is in the range of 10 to 50% by mass from the viewpoint of handling, and the concentration of the foaming agent is 20 to 40% by mass, which is easier to handle.
発泡用マスターバッチ中の発泡剤、ポリマ以外の副成分として、炭酸マグネシウム、炭酸カルシウム、炭酸水素ナトリウムなどの炭酸塩やクエン酸などを発泡核剤として用いても良い。また、必要に応じて、脱臭剤としてゼオライト系化合物を添加しても良い。更にはシリカやシリコーン系化合物、アクリレート系化合物などの分散性を向上させる添加剤が処方されていても良い。 As an auxiliary component other than the foaming agent and the polymer in the master batch for foaming, carbonates such as magnesium carbonate, calcium carbonate and sodium hydrogen carbonate, citric acid and the like may be used as the foaming nucleating agent. Further, if necessary, a zeolite-based compound may be added as a deodorant. Furthermore, additives that improve dispersibility such as silica, silicone compounds, and acrylate compounds may be prescribed.
発泡介在物５は、上記発泡用マスターバッチを２種以上使用して発泡成形されたものであることが好ましい。 The foam inclusions 5 are preferably foam-molded using two or more of the above-mentioned master batches for foaming.
発泡介在物５の発泡成形時における上記樹脂組成物と上記発泡用マスターバッチの混合割合は、上記樹脂組成物１００質量部に対して上記発泡用マスターバッチ中の発泡剤が１質量部以下となる割合であることが好ましく、０．１質量部以上０．９質量部以下となる割合であることがより好ましい。 The mixing ratio of the resin composition and the foaming masterbatch at the time of foam molding of the foaming inclusions 5 is 1 part by mass or less of the foaming agent in the foaming masterbatch with respect to 100 parts by mass of the resin composition. The ratio is preferably 0.1 part by mass or more and 0.9 part by mass or less.
〔発泡用マスターバッチの設計〕
上記樹脂組成物（介在用ポリマ）のベースポリマがＥＶＡのみ又はＥＶＡを主体としたポリマ構成で３５％以上の発泡度とする場合、発泡用マスターバッチのポリマや発泡剤は以下の観点から自由に設計できる。
[Design of masterbatch for foaming]
When the base polymer of the above resin composition (intervening polymer) is only EVA or a polymer composition mainly composed of EVA and the degree of foaming is 35% or more, the polymer and foaming agent of the master batch for foaming can be freely selected from the following viewpoints. Can be designed.
（大径泡を発生させる場合）
発泡用マスターバッチのポリマは介在用ポリマのベースポリマと同様のＥＶＡを選択したほうが良く、発泡剤はＡＤＣＡ、ＯＢＳＨのどちらを用いても良い。発泡用マスターバッチ中のポリマにＥＶＡを推奨する理由は介在用ポリマに用いたＥＶＡと親和させ、発泡の起点となる核の数を減少させるためである。発泡核が少なくなることで大径発泡が形成される。発泡剤のＡＤＣＡとＯＢＳＨを比較すると、発泡する成分の組成差から、ＯＢＳＨの方が若干大きめの発泡を形成する。ここでいう大径とは２５０μｍφ以上で構成されるものをいう。
(When generating large-diameter bubbles)
As the polymer of the masterbatch for foaming, it is better to select EVA similar to the base polymer of the intervening polymer, and either ADCA or OBSH may be used as the foaming agent. The reason for recommending EVA for the polymer in the foaming masterbatch is to make it compatible with the EVA used for the intervening polymer and reduce the number of nuclei that are the starting point of foaming. Large-diameter foam is formed by reducing the number of foam nuclei. Comparing the foaming agents ADCA and OBSH, OBSH forms slightly larger foam due to the difference in composition of the foaming components. The large diameter here means a diameter of 250 μmφ or more.
（小径泡を発生させる場合）
発泡用マスターバッチのポリマは介在用ポリマのベースポリマとグレードの異なるポリマを選択したほうが良く、発泡剤はＡＤＣＡを選定した方が良い。グレードの異なるポリマがＥＶＡを主体とするマトリックス中で、細径分散し、そこを核に発泡するからである。ここでいう小径とは２００μｍφ以下で構成されるものをいう。
(When generating small-diameter bubbles)
As the polymer of the masterbatch for foaming, it is better to select a polymer having a grade different from that of the base polymer of the intervening polymer, and it is better to select ADCA as the foaming agent. This is because polymers of different grades are dispersed in a small diameter in a matrix mainly composed of EVA and foamed around the core. The small diameter referred to here means a diameter of 200 μmφ or less.
本発明の実施の形態においては、大径泡及び小径泡の両方を発生させた形態が好ましい。このとき、大径泡と小径泡の中間の大きさである中径泡（泡の最大直径部分が２００μｍφを超えて２５０μｍφ未満）は存在してもしなくても良いが、存在する場合には泡全体の４〜６％程度（泡の横断面積における割合）であることが好ましい。 In the embodiment of the present invention, a form in which both large-diameter bubbles and small-diameter bubbles are generated is preferable. At this time, medium-diameter bubbles (the maximum diameter portion of the bubbles is more than 200 μmφ and less than 250 μmφ), which is an intermediate size between the large-diameter bubbles and the small-diameter bubbles, may or may not be present, but if they are present, the bubbles are present. It is preferably about 4 to 6% of the whole (ratio in the cross-sectional area of the foam).
なお、本発明の実施の形態において、平均気泡径は、製作した電気ケーブルの発泡介在物からブロック状の試料を切出し、その試料断面の写真を倍率１００〜４００倍の光学顕微鏡で撮影し、２００個以上の独立気泡の気泡直径（長径）を測定し、大径泡（２５０μｍφ以上）と小径泡（２００μｍφ以下）に分けた後、算術平均値として表した（後述の実施例においても同様）。 In the embodiment of the present invention, the average cell diameter is 200, which is obtained by cutting out a block-shaped sample from the foamed inclusions of the manufactured electric cable and taking a photograph of the sample cross section with an optical microscope having a magnification of 100 to 400 times. The bubble diameter (major axis) of one or more closed cells was measured, divided into a large-diameter bubble (250 μmφ or more) and a small-diameter bubble (200 μmφ or less), and then expressed as an arithmetic mean value (the same applies to the examples described later).
〔電気ケーブル成形時のアンモニア臭の抑制手法〕
上記「発泡用マスターバッチの設計」とも関連するが、本発明者らは、発泡用マスターバッチ種により下記表１の特徴を示すことを確認した。介在用ポリマのベースポリマをＥＶＡのみあるいはＥＶＡを主体としたポリマとし、発泡剤としてＡＤＣＡを用いた場合、ケーブル成形時にアンモニア臭を発生するという問題が生じた。そこで、本発明者らは図２に示す通り、樹脂組成物５１中に大径泡５２及び小径泡５３を有する発泡体を考えた。この発泡形態を成しうる手段が複数の発泡用マスターバッチをブレンドする方法である。すなわち、大径泡を生じさせる発泡用マスターバッチ（例えば、品名：EV306G、EE188E）と小径泡を生じさせる発泡用マスターバッチ（例えば、品名：ES405、EE405F）とをブレンドして使用する。２０％以上３５％未満の発泡度を狙う場合は、下記の表１に示した４種の発泡用マスターバッチ（品名：EV306G、EE188E、ES405、EE405F）の濃度が単独で１質量部でも電気ケーブル成形時にアンモニア臭は発生しないが、発泡度３５％以上を狙う系ではこの複数の発泡用マスターバッチをブレンドする方法が有効となる。
[Ammonia odor suppression method when molding electric cables]
Although related to the above-mentioned "design of masterbatch for foaming", the present inventors have confirmed that the masterbatch type for foaming exhibits the characteristics shown in Table 1 below. When the base polymer of the intervening polymer is EVA alone or the polymer mainly composed of EVA and ADCA is used as the foaming agent, there is a problem that an ammonia odor is generated during cable molding. Therefore, as shown in FIG. 2, the present inventors considered a foam having a large-diameter foam 52 and a small-diameter foam 53 in the resin composition 51. A means capable of forming this foaming form is a method of blending a plurality of master batches for foaming. That is, a masterbatch for foaming that produces large-diameter bubbles (for example, product names: EV306G, EE188E) and a masterbatch for foaming that produces small-diameter bubbles (for example, product names: ES405, EE405F) are blended and used. When aiming for a foaming degree of 20% or more and less than 35%, even if the concentration of the four types of master batches for foaming (product names: EV306G, EE188E, ES405, EE405F) shown in Table 1 below is 1 part by mass alone, the electric cable Although no ammonia odor is generated during molding, the method of blending a plurality of master batches for foaming is effective in a system aiming at a foaming degree of 35% or more.
また、大径泡５２及び小径泡５３（中径泡が存在する場合には中径泡も含む）は、図に示されるように、泡同士に合一がみられるもの（例えば、略球状を成した一つの泡と略球状を成したもう一つの泡の内部空間がつながっているもの）（以下、連続泡という。図２の連続泡５４）と、泡同士に合一がみられないもの（例えば、隣り合った泡間に界面が存在し（泡が独立して存在し）各泡が略球状を成しているもの）（以下、独立泡という）とが混在した実施形態であることが望ましい。発泡体中に混在した連続泡と独立泡の横断面積比率は、連続泡：独立泡＝７０％〜１０％：３０％〜９０％であることが好ましい。
Further, the large-diameter bubbles 52 and the small-diameter bubbles 53 (including the medium-diameter bubbles when the medium-diameter bubbles are present) are those in which the bubbles are united with each other (for example, substantially spherical) as shown in the figure. One bubble formed and another bubble forming a substantially spherical shape are connected to each other (hereinafter referred to as continuous bubbles;
以上より、本発明の実施の形態に係る電気ケーブル１０は、図１〜２に示されるように、導体１及び架橋ポリエチレンからなる絶縁体２を備えたケーブル線心３と、シース６と、ケーブル線心３とシース６との間に設けられた発泡介在物５とを備えた電気ケーブルであって、発泡介在物５は、発泡度が３５％以上であり、直径２５０μｍ以上の大径泡５２及び直径２００μｍ以下の小径泡５３を有する発泡体からなるものであることがアンモニア臭の抑制効果の観点で好ましい。
From the above, as shown in FIGS. 1 and 2, the electric cable 10 according to the embodiment of the present invention includes a
以下に、本発明を実施例に基づいて更に詳しく説明するが、本発明はこれらに限定されるものではない。 Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited thereto.
〔電気ケーブル作製〕
（実施例１〜８、参考例１〜４、比較例２〜５の電気ケーブル）
円形圧縮導体１（３ｍｍφ）（品番５．５ＳＱ）に絶縁体２としてシラン架橋ポリエチレンを肉厚が１．０ｍｍｔとなるように被覆してケーブル線心３を作製した。その後、３本のケーブル線心３をピッチ１８０ｍｍでＳ撚り（右撚り）し、撚り合せコア４を得た。得られた撚り合せコア４の周囲に２層ヘッド付押出機を用いて発泡介在物５（内層）及びＰＶＣシース６（外層）を設け、図１の構造の電気ケーブル１０を得た。発泡介在物５は、表２に示す介在用ポリマ（Ｐ１〜Ｐ１８）に表３に示す発泡用マスターバッチ（Ｍ１〜Ｍ１０）を表４に示す組み合わせにしたがって混合した樹脂組成物（試料Ｎｏ．１〜１６）を押出機に供給し、充実押出法で撚り合せコア４の周囲に被覆した。ＰＶＣシース６の材料は既存の材料を用い、厚さは１．５ｍｍｔで固定し、仕上がり外径１２．５ｍｍφとした。発泡介在物５及びＰＶＣシース６の押出条件は、表５の通り固定条件で行った。
[Electric cable production]
(Electrical cables of Examples 1 to 8, Reference Examples 1 to 4, and Comparative Examples 2 to 5)
A
（比較例１の電気ケーブル）
上記実施例と同様にして得た撚り合せコア４にＰＰヤーンを挿入しながらピッチ１８０ｍｍでＳ撚り（右撚り）し、ＰＥＴテープ巻を施した。その後、ＰＶＣシースを押出成形し、従来の電気ケーブルを得た。
(Electrical cable of Comparative Example 1)
While inserting the PP yarn into the twisted core 4 obtained in the same manner as in the above embodiment, S twisting (right twisting) was performed at a pitch of 180 mm, and PET tape winding was applied. Then, the PVC sheath was extruded to obtain a conventional electric cable.
作製した各電気ケーブルについて、下記方法で耐寒性、屈曲性及びアンモニア臭の抑制効果を評価した。また、発泡介在物５の発泡度を算出した。評価結果及び算出結果を表６〜７に示す。 For each of the produced electric cables, the cold resistance, flexibility, and the effect of suppressing the odor of ammonia were evaluated by the following methods. In addition, the degree of foaming of the foaming inclusions 5 was calculated. The evaluation results and calculation results are shown in Tables 6-7.
〔耐寒性〕
ＰＶＣシース６を剥いで、発泡介在物５を撚り合せコア４から分離させた後、発泡介在物５をJISK6723準拠の型枠（幅６ｍｍ、長さ３８ｍｍ）を用いて打ち抜き、試験片を作製した。この試験片を用いて耐寒性試験（JISK6723準拠）を実施した。試験結果が−２０℃以下のものを◎（合格：優良）、−２０℃未満−１５℃以下のものを○（合格：良）、−１５℃未満のものを×（不合格）とした。
[Cold resistance]
The PVC sheath 6 was peeled off, the foam inclusions 5 were twisted and separated from the core 4, and then the foam inclusions 5 were punched out using a JIS K6723 compliant mold (width 6 mm, length 38 mm) to prepare a test piece. .. A cold resistance test (JIS K6723 compliant) was conducted using this test piece. The test results of -20 ° C or lower were evaluated as ⊚ (pass: excellent), those of less than -20 ° C and below -15 ° C were evaluated as ◯ (pass: good), and those of less than -15 ° C were evaluated as x (fail).
〔屈曲性〕
電気ケーブルを３００ｍｍ長に切断し、１５０ｍｍを固定、１５０ｍｍをフリーとした状態で、フリーとなる先端に紐で５００ｇの錘を装着し、たわみ度合を求めた。たわみ量が７０ｍｍ以上のものを◎（合格：優良）、７０ｍｍ未満３０ｍｍ以上のものを○（合格：良）、３０ｍｍ未満のものを×（不合格）とした。
[Flexibility]
The electric cable was cut to a length of 300 mm, 150 mm was fixed, and 150 mm was free, and a weight of 500 g was attached to the tip of the free cable with a string to determine the degree of deflection. Those with a deflection amount of 70 mm or more were evaluated as ⊚ (pass: excellent), those with a deflection of less than 70 mm and 30 mm or more were evaluated as ◯ (pass: good), and those with a deflection amount of less than 30 mm were evaluated as × (fail).
〔アンモニア臭の抑制効果〕
電気ケーブル成形時、ダイス周辺でアンモニア臭がないものを○（合格）、アンモニア臭があるものを×（不合格）とした。
[Ammonia odor suppression effect]
When molding an electric cable, those without an ammonia odor around the die were marked with ○ (pass), and those with an ammonia odor were marked with × (fail).
〔発泡介在物の発泡度〕
電気ケーブルを１００ｍｍ長に切断し、ＰＶＣシース６を剥いで、発泡介在物５を取出し、その発泡度を比重法により算出した。具体的には、発泡度（％）＝１００−（発泡後の比重／発泡前の比重）×１００という式により求めた。
[Foamity of foam inclusions]
The electric cable was cut to a length of 100 mm, the PVC sheath 6 was peeled off, the foam inclusions 5 were taken out, and the degree of foaming thereof was calculated by the specific gravity method. Specifically, it was calculated by the formula: foaming degree (%) = 100- (specific gravity after foaming / specific density before foaming) × 100.
〔連続泡：独立泡の横断積比率〕
電気ケーブルの横断面写真を撮影し、横断面における発泡介在物５中の連続泡と独立泡の面積比率から連続泡：独立泡の横断積比率を算出した。
[Continuous foam: Cross-sectional product ratio of independent foam]
A cross-sectional photograph of the electric cable was taken, and the cross-sectional area ratio of continuous foam: independent foam was calculated from the area ratio of continuous foam and independent foam in the foam inclusions 5 in the cross section.
・参考例１〜２は、介在用ポリマとしてＥＶＡ１種を用いた系である。
・参考例３及び実施例１は、介在用ポリマとしてＥＶＡ２種を用いた系である。実施例１は、発泡用マスターバッチ２種をブレンドした系である。
・参考例４は、介在用ポリマとしてＥＶＡ３種を用いた系である。
・実施例２〜６は、介在用ポリマとしてＥＶＡにＬＤＰＥ又はＰＰをブレンドした系であり、発泡用マスターバッチ２種以上をブレンドした系である。
・実施例７〜８は、介在用ポリマとしてＥＶＡにＬＤＰＥをブレンドし、かつ、炭酸カルシウム又は焼成クレーをブレンドした系であり、発泡用マスターバッチ２種以上をブレンドした系である。
・実施例１〜８及び参考例１〜４では、発泡度の制御が容易であり、かつ耐寒性、屈曲性、アンモニア臭抑制のいずれも良好な結果を得ることができた。なお、実施例７〜８では、耐寒性及び屈曲性に若干性能低下が見られた。
・実施例１〜８及び参考例１〜４では、発泡介在物５の発泡度を２０％以上とすることができたため、比較例１の電気ケーブルの質量を１００とした場合における質量を１０５以下に抑えることができた。
・実施例１〜８は、発泡介在物５の発泡度が３５％以上となった。また、実施例１〜８の発泡介在物５は、図２に示す大径泡５２及び小径泡５３を有する発泡体構造となっていた。これは発泡用マスターバッチとして、表１における発泡径が「大」のものと「小」のものとの組み合わせとなる２種以上の発泡用マスターバッチを用いたことによるものと考える。
-Reference Examples 1 and 2 are systems using EVA1 type as an intervening polymer.
-Reference Example 3 and Example 1 are systems using EVA2 type as an intervening polymer. Example 1 is a system in which two types of master batches for foaming are blended.
-Reference example 4 is a system using 3 types of EVA as an intervening polymer.
-Examples 2 to 6 are a system in which LDPE or PP is blended with EVA as an intervening polymer, and a system in which two or more kinds of master batches for foaming are blended.
-Examples 7 to 8 are a system in which LDPE is blended with EVA as an intervening polymer and calcium carbonate or calcined clay is blended, and two or more kinds of master batches for foaming are blended.
-In Examples 1 to 8 and Reference Examples 1 to 4, the degree of foaming was easily controlled, and good results were obtained in all of cold resistance, flexibility, and suppression of ammonia odor. In Examples 7 to 8, performance was slightly deteriorated in cold resistance and flexibility.
-In Examples 1 to 8 and Reference Examples 1 to 4, the degree of foaming of the foamed inclusions 5 could be 20% or more, so that the mass of the electric cable of Comparative Example 1 was 105 or less when the mass was 100. I was able to suppress it.
-In Examples 1 to 8, the degree of foaming of the foaming inclusions 5 was 35% or more. Further, the foam inclusions 5 of Examples 1 to 8 had a foam structure having the large-diameter bubbles 52 and the small-diameter bubbles 53 shown in FIG. It is considered that this is because two or more kinds of master batches for foaming, which are combinations of those having a foam diameter of "large" and "small" in Table 1, were used as the master batch for foaming.
・比較例１の従来の電気ケーブルの介在は、ＰＰヤーンとＰＥＴテープで構成されているため、耐寒性の試験は行わず、屈曲性試験のみ実施したが、ケーブルがたわまず良好な結果を得られなかった。
・比較例２〜５は、介在用ポリマとしてＰＰ又はＬＤＰＥを用いた系である。比較例２〜３では耐寒性及び屈曲性が悪く、比較例４〜５では加えてアンモニア臭が発生した。一方、比較例４，５と発泡剤量が同濃度である実施例７、１１では良好な結果が得られており、本発明の効果といえる。
-Since the conventional electric cable of Comparative Example 1 is composed of PP yarn and PET tape, the cold resistance test was not performed and only the flexibility test was performed, but the cable did not bend and good results were obtained. I couldn't get it.
-Comparative Examples 2 to 5 are systems using PP or LDPE as an intervening polymer. In Comparative Examples 2 and 3, cold resistance and flexibility were poor, and in Comparative Examples 4 and 5, an ammonia odor was additionally generated. On the other hand, good results were obtained in Examples 7 and 11 in which the amounts of the foaming agents were the same as those in Comparative Examples 4 and 5, which can be said to be the effect of the present invention.
以上述べた本発明を実施するための形態による電気ケーブル及びその製造方法によれば、前述した〔発明の効果〕を含んだ以下の効果を奏することができる。
（１）発泡介在物を発泡させるために水を用いることを条件としないために、水以外の発泡剤を用いることにより発泡介在物の発泡度を容易に制御することができる。
（２）安価で発泡効率の良い発泡剤であるＡＤＣＡを用いたとしても、発泡介在物が大径泡と小径泡を有しているので、アンモニア臭の発生を抑制することができる。発泡介在物が前記した大小の泡を有する構成にすると、どうして前記アンモニア臭の発生が抑制できるかは、いまのところ不明である。
（３）発泡介在物を、一般的に耐寒性が低いポリエチレン、ポリプロピレン等のホモポリマーに代えて、一般的に耐寒性に優れたコポリマーであるエチレン酢酸ビニル共重合体（ＥＶＡ）としたため、耐寒性を向上することができる。
（４）発泡介在物を３５％以上の適切な発泡度にしたため、電気ケーブルの屈曲性を所望のものにすることができる。
According to the electric cable and the method for manufacturing the electric cable according to the embodiment of the present invention described above, the following effects including the above-mentioned [effect of the invention] can be obtained.
(1) Since it is not a condition that water is used to foam the foaming inclusions, the degree of foaming of the foaming inclusions can be easily controlled by using a foaming agent other than water.
(2) Even if ADCA, which is an inexpensive and highly foaming agent, is used, the foaming inclusions have large-diameter bubbles and small-diameter bubbles, so that the generation of ammonia odor can be suppressed. It is currently unclear why the generation of the ammonia odor can be suppressed when the foam inclusions have the above-mentioned large and small bubbles.
(3) Since the foam inclusions were replaced with homopolymers such as polyethylene and polypropylene, which generally have low cold resistance, ethylene-vinyl acetate copolymer (EVA), which is a copolymer generally excellent in cold resistance, was used, so that it was cold-resistant. The sex can be improved.
(4) Since the foam inclusions have an appropriate degree of foaming of 35% or more, the flexibility of the electric cable can be made desired.
なお、本発明は、上記本発明の実施の形態及び実施例に限定されない。例えば、請求項１の発明では、「複数のケーブル線心」としたが、「複数のケーブル線心」は、例えば、「一本のケーブル線心」と「導波管」等の長尺部材の組み合わせであっても良い。 The present invention is not limited to the above-described embodiments and examples of the present invention. For example, in the invention of claim 1, "plurality of cable cores" is used, but "plurality of cable cores" is a long member such as "one cable core" and "waveguide". It may be a combination of.
１：導体、２：絶縁体、３：ケーブル線心、４：撚り合わせコア
５：発泡介在物、６：シース
５１：樹脂組成物、５２：大径泡、５３：小径泡、５４：連続泡
１０：電気ケーブル
1: Conductor, 2: Insulator, 3: Cable core, 4: Twisted core 5: Foam inclusions, 6: Sheath 51: Resin composition, 52: Large diameter foam, 53: Small diameter foam, 54: Continuous foam 10: Electric cable
Claims (10)
前記発泡介在物は、エチレン酢酸ビニル共重合体（ＥＶＡ）を４０質量％以上含有する樹脂組成物と、ベースポリマとしてエチレン酢酸ビニル共重合体（ＥＶＡ）、ポリエチレン及びポリスチレンから選ばれる１種以上を含む発泡用マスターバッチとを使用して発泡成形されたものであって、発泡度が３５％以上であり、直径２５０μｍ以上の大径泡及び直径２００μｍ以下の小径泡を有することを特徴とする電気ケーブルの製造方法。 A plurality of cable cores including a conductor and an insulator covering the conductor, foam inclusions interposed in the gaps between the plurality of cable cores, the plurality of cable cores, and the foam inclusions are collectively covered. It is a method of manufacturing an electric cable equipped with a sheath and a sheath.
The foam inclusions include a resin composition containing 40% by mass or more of ethylene vinyl acetate copolymer (EVA), and one or more selected from ethylene vinyl acetate copolymer (EVA), polyethylene and polystyrene as a base polymer. characterized by using a foaming masterbatch be one that is foam-molded state, and are foaming degree is 35% or more, the Rukoto that have a large径泡and diameter 200μm or less of the small-diameter bubbles than the diameter 250μm comprising The manufacturing method of the electric cable.
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