JP5360859B2 - Watertight polyethylene insulated wire - Google Patents

Watertight polyethylene insulated wire Download PDF

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JP5360859B2
JP5360859B2 JP2007277685A JP2007277685A JP5360859B2 JP 5360859 B2 JP5360859 B2 JP 5360859B2 JP 2007277685 A JP2007277685 A JP 2007277685A JP 2007277685 A JP2007277685 A JP 2007277685A JP 5360859 B2 JP5360859 B2 JP 5360859B2
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polyethylene
insulator
watertight
insulated wire
watertight material
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JP2009104991A (en
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孝夫 熊澤
浩市 木全
清司 森永
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Chubu Electric Power Co Inc
Tatsuta Electric Wire and Cable Co Ltd
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Chubu Electric Power Co Inc
Tatsuta Electric Wire and Cable Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/14Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/82Recycling of waste of electrical or electronic equipment [WEEE]

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Description

この発明は、複数の素線からなる導体のその各素線間に水密材を充填し、その導体の外周面にポリエチレンを被覆した水密型ポリエチレン絶縁電線に関する。   The present invention relates to a watertight polyethylene insulated electric wire in which a watertight material is filled between each strand of a conductor composed of a plurality of strands, and the outer peripheral surface of the conductor is covered with polyethylene.

この種の水密型ポリエチレン絶縁電線(OE−W)は、図3に示すように、複数の素線1aを撚り合わせた導体1のその周囲及び各素線1a、1a間に水密材2を充填し、その導体1(水密材2)の外周面にポリエチレン3を被覆したものが一般的であり、屋外配線用として使用される(特許文献1 段落0002 図1参照)。
特開2006−328152号公報
As shown in FIG. 3, this type of watertight polyethylene insulated wire (OE-W) is filled with a watertight material 2 around the conductor 1 in which a plurality of strands 1a are twisted and between the strands 1a and 1a. The conductor 1 (watertight material 2) is generally coated with polyethylene 3 on the outer peripheral surface, and is used for outdoor wiring (see Patent Document 1, Paragraph 0002, FIG. 1).
JP 2006-328152 A

その屋外配線における架線工事の際、一の水密型ポリエチレン絶縁電線Pと他の水密型ポリエチレン絶縁電線P又は他の絶縁電線とを電気的に接続するため、上記ポリエチレン被覆からなる絶縁体3を剥ぎ取って導体1を露出させる皮剥作業を伴う。その皮剥作業は、例えば、図4に示す電線皮剥ぎ器Aによって行う。   At the time of the overhead line construction in the outdoor wiring, in order to electrically connect one watertight polyethylene insulated wire P and another watertight polyethylene insulated wire P or another insulated wire, the insulator 3 made of the polyethylene coating is stripped off. This involves a stripping operation to expose the conductor 1. The skinning operation is performed by, for example, the wire stripper A shown in FIG.

この電線皮剥ぎ器Aは、2つ割りの円筒状挟持部21の各片にアーム22を設けるとともに、その挟持部21の一片に剥ぎ取り刃23を設けたものであり、まず、同図(a)の開いた状態で絶縁電線Pを挟持部21に入れて挟み、つづいて、剥ぎ取り刃23を絶縁電線Pの絶縁体3に食い込ませ(同図(b))、その状態において、絶縁電線Pに対して電線皮剥ぎ器Aを同図(b)矢印のように回すと、同図(c)に示すように、剥ぎ取り刃23が回転につれてその幅分(剥ぎ取り刃23の食い込んでいる部分)aの絶縁体3を剥ぎ取る。   This wire stripper A is provided with an arm 22 on each piece of the split cylindrical holding portion 21 and a stripping blade 23 on one piece of the holding portion 21. First, FIG. In the state where a) is opened, the insulated wire P is put into the sandwiching portion 21 and sandwiched, and then, the stripping blade 23 is bitten into the insulator 3 of the insulated wire P ((b) in the figure). When the wire stripper A is rotated with respect to the wire P as shown by the arrow (b) in the figure, as shown in the figure (c), as the stripping blade 23 rotates, the width (the stripping blade 23 bites in). The insulator 3 of the a) protruding part a is stripped off.

この剥ぎ取り作業の際、絶縁体3と水密材2の接合力が弱いと、絶縁体3のみが剥がれ、水密材2が導体1上に残り、電線接続作業に支障が出る。このため、一般的な水密型ポリエチレン絶縁電線Pは、上記絶縁体3と水密材2を融着した構造としている。   If the bonding force between the insulator 3 and the watertight material 2 is weak during this stripping operation, only the insulator 3 is peeled off, and the watertight material 2 remains on the conductor 1, which hinders the wire connection operation. Therefore, a general watertight polyethylene insulated wire P has a structure in which the insulator 3 and the watertight material 2 are fused.

しかしながら、屋外配線された水密型ポリエチレン絶縁電線は、夏の炎天下では、その絶縁体3が60℃以上の高温となり、その絶縁体3の硬度(剛性)が低下する。この剛性の低下のため、上記架線工事における絶縁体3の剥ぎ取り作業の際、上記電線皮剥ぎ器Aの回転につれて剥ぎ取り部aの両側の絶縁体bが供回りして、円滑な剥ぎ取りができない場合がある(図4(c)参照)。   However, a watertight polyethylene insulated wire that is wired outdoors has a high temperature of 60 ° C. or higher when the insulator 3 is hot in summer, and the hardness (rigidity) of the insulator 3 decreases. Due to this reduction in rigidity, the insulator b on both sides of the stripping portion a is provided along with the rotation of the wire stripper A during the stripping operation of the insulator 3 in the overhead wire construction, so that the stripping can be performed smoothly. May not be possible (see FIG. 4C).

また、近年のリサイクル気運の高まりの下、各種の絶縁電線Pにおいても例外でない。このため、この水密型ポリエチレン絶縁電線Pにおいても、そのリサイクルの一つとして、上記ポリエチレン被覆からなる絶縁体3のリサイクルが考えられる。
その絶縁体3をリサイクルする際、使用済水密型ポリエチレン絶縁電線Pから回収した絶縁体3には、上述のように、絶縁体3と水密材2を融着させていることから、導体1周囲の水密材2が混入している。
In addition, under the recent trend of recycling, various types of insulated wires P are no exception. For this reason, also in this watertight type polyethylene insulated electric wire P, as one of the recycling, recycling of the insulator 3 which consists of the said polyethylene coating can be considered.
When the insulator 3 is recycled, the insulator 3 collected from the used watertight polyethylene insulated wire P is fused with the insulator 3 and the watertight material 2 as described above. The watertight material 2 is mixed.

例えば、図2に示す、19本の銅素線(径:2mmφ)1aを同心撚りした公称断面積60mm2の水密型ポリエチレン絶縁電線Pにおいて、その各寸法が図示の通りの場合、この使用済水密型ポリエチレン絶縁電線Pから絶縁体3を皮剥ぎして回収すると、図中、導体1の外接円(鎖線)の外側部分2a及びその外接円と最外層素線1aで囲まれた部分2bの水密材2(点加入部分)が絶縁体3とともに剥ぎ取られる。
その剥ぎ取られる厚み(水密材2の外接円(鎖線)から外周までの厚みの部分2a)を、実質的な上限値と考えられる0.1mmと仮定し、外接円と最外層素線1aで囲まれた部分2bの水密材2も完全に剥ぎ取られるとすると、その剥ぎ取った絶縁体3への水密材2(2a+2b)の混入率は、表1に示す値となる。このため、以下は、使用済水密型ポリエチレン絶縁電線Pから絶縁体3を皮剥ぎして回収する際の一般的な絶縁体3への水密材2の混入率を19vol%とする。
For example, in the case of a watertight polyethylene insulated wire P having a nominal cross-sectional area of 60 mm 2 in which 19 copper strands (diameter: 2 mmφ) 1a are concentrically twisted as shown in FIG. When the insulator 3 is peeled off and collected from the watertight polyethylene insulated wire P, the outer portion 2a of the circumscribed circle (chain line) of the conductor 1 and the portion 2b surrounded by the circumscribed circle and the outermost strand 1a are shown in the figure. The watertight material 2 (point addition portion) is peeled off together with the insulator 3.
The stripped thickness (the portion 2a of the thickness from the circumscribed circle (chain line) to the outer periphery of the watertight material 2) is assumed to be a substantial upper limit of 0.1 mm, and the circumscribed circle and the outermost strand 1a Assuming that the watertight material 2 in the enclosed portion 2b is also completely peeled off, the mixing ratio of the watertight material 2 (2a + 2b) into the peeled insulator 3 has the values shown in Table 1. Therefore, in the following, the mixing ratio of the watertight material 2 to the general insulator 3 when the insulator 3 is peeled off from the used watertight polyethylene insulated wire P and recovered is 19 vol%.

Figure 0005360859
Figure 0005360859

この水密材2の混入した絶縁体(ポリエチレン)3は、その混入していないポリエチレンに対してその特性が大きく異なる。このため、従来では、その使用済水密型ポリエチレン絶縁電線Pの絶縁体3のリサイクルはなされていない。   The characteristics of the insulator (polyethylene) 3 mixed with the watertight material 2 are greatly different from those of the non-mixed polyethylene. For this reason, conventionally, the insulator 3 of the used watertight polyethylene insulated wire P has not been recycled.

この発明は、上記の実情に鑑み、高温下での絶縁体の剥ぎ取り作業を円滑化し、併せて、使用済ポリエチレン絶縁電線Pの絶縁体を使用して、新たに、使用可能な水密型ポリエチレン絶縁電線を得ることを課題とする。   In view of the above circumstances, the present invention facilitates the stripping operation of the insulator under high temperature, and at the same time, newly uses a watertight polyethylene that can be used by using the insulator of the used polyethylene insulated wire P. An object is to obtain an insulated wire.

上記課題を達成するために、この発明は、まず、導体素線に、その表面に水密材との密着性を高める表面処理剤が塗布されたものとしたのである。
導体素線と水密材の密着性が高まれば、高温下での絶縁体の剥ぎ取り作業においても、水密材を介して導体と絶縁体の一体化が維持されるため、上記皮剥ぎ器の回転につれての剥ぎ取り部a両側の絶縁体bの供回りが生じにくく、円滑な剥ぎ取りを行うことができる。
In order to achieve the above object, according to the present invention, first, a surface treatment agent for improving adhesion to a watertight material is applied to a conductor wire.
If the adhesion between the conductor wire and the watertight material is increased, the integration of the conductor and the insulator is maintained through the watertight material even when the insulator is peeled off at high temperatures. As a result, the insulator b on both sides of the stripped portion a is less likely to be rotated, and smooth stripping can be performed.

つぎに、この発明は、水密材には、元来から良好な電気絶縁性を有する熱可塑性のもの、例えば、EVA(エチレン−酢酸ビニル共重合樹脂)、EEA(エチレン−エチルアクリレート共重合樹脂)、EMA(エチレン−メチルアクリレート共重合樹脂)、EMMA(エチレン−メチルメタクリレート共重合樹脂)等を主成分とするものを使用することとしたのである。
水密材に熱硬化性樹脂を使用すれば、その粘弾性を広い温度範囲で確保できるが、熱硬化性樹脂の混入したポリエチレンは押出成型時において溶融しないので、押出表面にブツブツが発生し絶縁電線の絶縁体として使用することは困難である。このため、水密材には押出成型時において溶融する熱可塑性樹脂を使用する。
Next, according to the present invention, the watertight material is originally a thermoplastic having good electrical insulation, for example, EVA (ethylene-vinyl acetate copolymer resin), EEA (ethylene-ethyl acrylate copolymer resin). , EMA (ethylene-methyl acrylate copolymer resin), EMMA (ethylene-methyl methacrylate copolymer resin) and the like are used as main components.
If a thermosetting resin is used for the watertight material, its viscoelasticity can be secured in a wide temperature range, but polyethylene mixed with the thermosetting resin does not melt at the time of extrusion molding. It is difficult to use as an insulator. For this reason, a thermoplastic resin that melts at the time of extrusion molding is used as the watertight material.

また、水密材として、この良好な電気絶縁性を有する材料を主成分とするものとしたのは、ポリエチレンからなる絶縁体に混入しても、耐電圧等の絶縁電線の絶縁体に要求される一般特性には問題がないことを下記表2で示す実験などによって得たからである。
さらに、このような熱可塑性の水密材は、最大19vol%内では、ポリエチレンからなる絶縁体に混入しても、その外観、引張強度等の機械的強度に支障がないことを同表2で示す実験などによって得たからである。
その表2において、電気絶縁性はプレスシートによる体積抵抗率でもって評価し、押出外観はラボテスト押出機によるベルト押出し試料の外観でもって評価し、引張特性はプレスシートからJIS-3号ダンベルによる打ち抜きでもって評価し、水密材混入率はいずれも19vol%である。
In addition, the main component of the material having good electrical insulation as the watertight material is required for the insulation of the insulated wire, such as withstand voltage, even if it is mixed in the insulation made of polyethylene. This is because it has been obtained by experiments shown in Table 2 below that there is no problem with the general characteristics.
Further, Table 2 shows that such a thermoplastic water-tight material has no problem in mechanical strength such as appearance and tensile strength even when mixed in an insulator made of polyethylene within a maximum of 19 vol%. This is because it was obtained through experiments.
In Table 2, the electrical insulation is evaluated by the volume resistivity by the press sheet, the extrusion appearance is evaluated by the appearance of the belt extruded sample by the laboratory test extruder, and the tensile properties are punched from the press sheet by JIS-3 dumbbell. Therefore, the watertight material mixing rate is 19 vol%.

Figure 0005360859
Figure 0005360859

また、上記のように、絶縁体は高温(例えば60℃)になると、その絶縁体の硬度(剛性)が低下するため、上記の絶縁体の剥ぎ取り作業の際、絶縁体bの供回りが生じ、この現象は、特に水密材が混入した絶縁体において顕著になる。
このとき、何らかの方法で導体と水密材の接合力を高めた上で水密材に硬質のものを使用すれば、その絶縁体の剛性の低下を補うことができ、その供回りを抑制できると同時に雨水浸入防止性を確保できる。
しかし、導体と水密材の接合力が弱いままに硬質水密材を使用したのでは硬質であるが故の粘弾性の乏しさから、水密型ポリエチレン絶縁電線の雨水浸入防止性(水密性)の確保が困難となる。
これに対し、上述のように、この発明は、導体素線に、その表面に水密材との密着性を高める表面処理剤を塗布されたものとしたので、導体素線は水密材との密着強度が高いものとなり、その導体素線間の水密性(雨水浸入防止性)は、水密材の粘弾性に依存する割合が低下する。このため、水密材に硬質な樹脂を採用しても、導体素線間の水密性(雨水浸入防止性)を確保することができる。
Further, as described above, when the insulator is at a high temperature (for example, 60 ° C.), the hardness (rigidity) of the insulator is reduced. This phenomenon occurs particularly in an insulator mixed with a watertight material.
At this time, if the bonding strength between the conductor and the watertight material is increased by some method and a hard material is used as the watertight material, the decrease in rigidity of the insulator can be compensated for, and at the same time the rotation can be suppressed. Prevents rainwater entry.
However, the use of a hard watertight material while the bonding strength between the conductor and the watertight material is weak makes it possible to prevent rainwater from entering the watertight polyethylene insulated wire (watertightness) due to its poor viscoelasticity due to its rigidity. It becomes difficult.
On the other hand, as described above, the present invention is such that the conductor strand is coated with a surface treatment agent that enhances the adhesion to the watertight material on the surface thereof, so that the conductor strand is in close contact with the watertight material. The strength becomes high, and the ratio of the watertightness (prevention of rainwater intrusion) between the conductor wires decreases depending on the viscoelasticity of the watertight material. For this reason, even if hard resin is adopted as the watertight material, it is possible to ensure watertightness (prevention of rainwater intrusion) between the conductor wires.

上記課題を解決した発明の構成としては、複数の素線からなる導体のその各素線間に電気絶縁性水密材を充填し、その導体の外周面にポリエチレンを被覆した水密型ポリエチレン絶縁電線において、前記各素線表面に前記水密材との密着性を高める表面処理剤が塗布され、その水密材には熱可塑性の電気絶縁性樹脂が使用された構成を採用することができる。   As a configuration of the invention that solves the above problems, in a water-tight polyethylene insulated wire in which an electrically insulating water-tight material is filled between conductors of a plurality of strands, and the outer peripheral surface of the conductor is covered with polyethylene. The surface treatment agent that enhances the adhesion to the watertight material is applied to the surface of each of the strands, and a configuration in which a thermoplastic electrical insulating resin is used for the watertight material can be employed.

この構成の水密型ポリエチレン絶縁電線は、その絶縁体をリサイクルする際、水密材が回収した絶縁体に混入するが、上述のように、その水密材がポリエチレンからなる絶縁体に混入しても、その外観、電気特性、引張強度等の機械的強度に支障がないため、リサイクルの支障とならない。
このため、この構成の水密型ポリエチレン絶縁電線は、その構成の使用済水密型ポリエチレン絶縁電線から回収・改質した再生ポリエチレンを使用した絶縁体とすることができる。
The watertight polyethylene insulated wire of this configuration is mixed into the insulator recovered by the watertight material when recycling the insulator, but as described above, even if the watertight material is mixed into the insulator made of polyethylene, There is no hindrance in mechanical strength such as appearance, electrical characteristics, and tensile strength, so it does not hinder recycling.
For this reason, the watertight polyethylene insulated wire having this configuration can be an insulator using recycled polyethylene recovered and modified from the used watertight polyethylene insulated wire having the configuration.

ここで、上述のように、上記水密材に硬質のものを使用すれば、その水密材が混入した絶縁体の剛性の低下を補うため、絶縁体の皮剥ぎ作業におけるその供回りを抑制できる。このため、その供回りを回避できる水密材の硬度を、使用態様に基づき適宜に設定すればよい。   Here, as described above, if a hard material is used as the watertight material, the reduction in rigidity of the insulator mixed with the watertight material is compensated for, so that the surroundings in the skinning operation of the insulator can be suppressed. For this reason, what is necessary is just to set suitably the hardness of the watertight material which can avoid the rotation based on a use aspect.

例えば、屋外配線における架線工事は、上述のように、夏場の炎天下が最も厳しい環境であって、その環境下では、絶縁体は60℃程の高温となる。このため、この最も厳しい環境下の作業でも、皮剥ぎ作業における絶縁体の供回りが生じないようにするためには、水密材は、まず、その温度、60℃では溶融しない融点が60℃を超える(複数の樹脂を配合して使用する場合には、そのいずれの樹脂の融点も60℃を超える)樹脂を使用し、つぎに、その60℃においても、供回りをしない高い硬度を有するものとする。
すなわち、上記の構成において、上記水密材は、その構成樹脂の融点が何れも60℃を超えるものであって、その60℃における硬度がデュロメータTYPE:Aで40以上あるものとすることができる。好ましくは48以上とする。
水密材の構成樹脂の融点が何れも60℃を超えるものであれば、60℃を超えた高温下で電線皮剥ぎ器を回転させて絶縁体の皮剥ぎをしても、導体と絶縁体の一体化が維持されるため(一体化の維持が失われることなく)、その剥ぎ取り部の両側の絶縁体が供回りしにくくなる。硬度がデュロメータTYPE:Aで40未満であれば、水密材の混入した絶縁体の皮剥ぎは、供回りをして皮剥ぎ作業に支障をきたす。40以上であれば、水密材の混入した絶縁体の皮剥ぎは、少し供回りはするが、皮剥ぎ作業は可能である。また、48以上であれば水密材の混入した絶縁体の皮剥ぎは、ほとんど供回りがなく皮剥ぎ作業ができる。
For example, as described above, the overhead wire work in outdoor wiring is under the severest environment under the hot summer, and the insulator becomes a high temperature of about 60 ° C. under the environment. For this reason, in order to prevent the insulator from circulating in the skinning operation even in the harshest environment, the watertight material first has a melting point of 60 ° C. that does not melt at 60 ° C. Use a resin that exceeds (the melting point of any one of the resins exceeds 60 ° C. when used in combination with a plurality of resins), and then has a high hardness that does not allow even at 60 ° C. And
That is, in the above configuration, the watertight material may have a melting point of the constituent resin exceeding 60 ° C. and a hardness at 60 ° C. of 40 or more in durometer TYPE: A. Preferably it is 48 or more.
If the melting point of the constituent resin of the watertight material exceeds 60 ° C, the conductor and the insulator can be peeled off even if the wire stripper is rotated at a high temperature exceeding 60 ° C to peel off the insulator. Since the integration is maintained (without maintaining the integration), it becomes difficult for the insulators on both sides of the stripped portion to be rotated. If the hardness is durometer TYPE: A less than 40, the skin of the insulator mixed with the water-tight material is rotated and interferes with the skin peeling operation. If the 40 higher, peeling is entrained skin insulator watertight material, a little rotating together is, skinning operations are possible. Further, peeling skin contaminating insulator watertight material as long as the 48 or more can hardly rotate together skin without peeling-off work.

なお、水密材の混入していない絶縁体は、水密材の混入している絶縁体に比べ高温化による剛性の低下が小さいため、硬度の低い軟質の水密材を使用しても、供回りは小さく、皮剥ぎは可能であるが、水密材の混入している絶縁体であっても、その水密材に上記の硬質のものを使用すれば、供回りはほとんどなく、皮剥ぎ作業性は容易となる。このことから、絶縁体の皮剥ぎ作業にすこぶる円滑さを望まなければ、水密材に硬質なものを必ずしも使用する必要はない(軟質なものを適宜に使用し得る)。 Insulators that are not mixed with watertight materials are less susceptible to lowering of rigidity due to higher temperatures than insulators that are mixed with watertight materials, so even if soft watertight materials with low hardness are used, Although it is small and can be peeled off, even if it is an insulator mixed with a watertight material, if the above-mentioned hard material is used for the watertight material, there is almost no provision and the skinning workability is easy It becomes. For this reason, it is not always necessary to use a hard material for the watertight material (a soft material can be used as appropriate) unless super smoothness is desired in the skinning operation of the insulator.

上記表面処理剤は、使用する水密材との密着性を高めるものであれば、何れでも良いが、例えば、ベンゾトリアゾール(その誘導体(ベンゾトリアゾール誘導体)及び混合物(ベンゾトリアゾールとベンゾトリアゾール誘導体の混合物)を含む)、エポキシ系可塑剤、残部が溶剤からなるものを採用する(特許文献2 特許請求の範囲参照)。
すなわち、ベンゾトリアゾールは、銅加工品に防錆剤として塗布されることがあり、これ自体も銅と水密材の接着力を高める効果を有するが、一定量以上に添加量を多くしても、接着力のさらなる向上は得られない。しかし、ベンゾトリアゾールにエポキシ系可塑剤を添加すると、エポキシ系可塑剤が金属、ポリオレフィン、いずれに対しても親和性が強いエポキシ基を有しており、またベンゾトリアゾールと異なり常温で液体であるために、ベンゾトリアゾールの皮膜に浸入し、ベンゾトリアゾールだけを用いた場合に比べ、より接着力を向上させることを見出した。この発見に基づき、表面処理剤に、ベンゾトリアゾール、エポキシ系可塑剤、残部が溶剤からなるものを採用できるとしたのである。
特公平03−71516号公報
The surface treatment agent may be any surface-enhancing agent as long as it enhances the adhesion to the watertight material used. For example, benzotriazole (its derivative (benzotriazole derivative) and mixture (a mixture of benzotriazole and benzotriazole derivative)) ), An epoxy plasticizer, and the balance consisting of a solvent is employed (see patent document 2 claims).
That is, benzotriazole may be applied as a rust preventive to processed copper products, and this has the effect of increasing the adhesion between copper and watertight material, but even if the amount added is increased beyond a certain amount, No further improvement in adhesion can be obtained. However, when an epoxy plasticizer is added to benzotriazole, the epoxy plasticizer has an epoxy group with a strong affinity for both metals and polyolefins, and unlike benzotriazole, it is liquid at room temperature. In addition, it was found that the adhesive strength was further improved as compared with the case where only the benzotriazole was used by entering the benzotriazole film. Based on this discovery, the surface treatment agent can be made of benzotriazole, an epoxy plasticizer, and the balance being a solvent.
Japanese Patent Publication No. 03-71516

その混合割合は、ベンゾトリアゾール:0.1〜10重量%、より好ましくは0.2〜5重量%、エポキシ系可塑剤:0.05〜10重量%、より好ましくは0.1〜5重量%とする。
ベンゾトリアゾール:0.1重量%未満では、接着力が不足し、10重量%以上では、接着力が飽和する。同0.2〜5重量%では、接着力の向上効果とコストバランスが良い。
エポキシ系可塑剤:0.05重量%未満では接着力が不足し、10重量%以上では、接着力が飽和し、さらに過剰に添加すると、過剰な可塑剤が液体皮膜を形成するため、却って接着力が低下する。また、過剰な可塑剤が製造工程中のガイドローラ等の接触部材に付着するため、好ましくない。同0.1〜5重量%では、接着力の向上効果とコストバランスが良く、可塑剤の付着も少ない。
The mixing ratio is benzotriazole: 0.1 to 10% by weight, more preferably 0.2 to 5% by weight, epoxy plasticizer: 0.05 to 10% by weight, more preferably 0.1 to 5% by weight. And
Benzotriazole: If it is less than 0.1% by weight, the adhesive force is insufficient, and if it is 10% by weight or more, the adhesive force is saturated. If the content is 0.2 to 5% by weight, the effect of improving the adhesive force and the cost balance are good.
Epoxy plasticizer: Adhesive strength is insufficient at less than 0.05% by weight, adhesive strength is saturated at 10% by weight or more, and when added excessively, excess plasticizer forms a liquid film. Power is reduced. Moreover, since an excess plasticizer adheres to contact members, such as a guide roller in a manufacturing process, it is unpreferable. When the content is 0.1 to 5% by weight, the effect of improving the adhesive force and the cost balance are good, and the plasticizer is hardly attached.

この発明は、以上の構成とすることにより、高温下での絶縁体の剥ぎ取り作業における供回りを防止し得るものとすることができるとともに、使用済となってもその絶縁体を新たな水密型ポリエチレン絶縁電線の絶縁体として使用して、さらに、使用可能な水密型ポリエチレン絶縁電線を得ることができる。また、その再生絶縁体を使用した水密型ポリエチレン絶縁電線もその絶縁体を再使用できる。このため、水密型ポリエチレン絶縁電線の絶縁体のクローズドリサイクルを構築できる。   With the above configuration, the present invention can prevent surroundings in the work of stripping off the insulator at high temperatures, and even if the insulator has been used, the insulator is newly sealed. A watertight polyethylene insulated electric wire that can be used can be obtained by using it as an insulator for a type polyethylene insulated electric wire. In addition, a watertight polyethylene insulated wire using the regenerated insulator can be reused. For this reason, the closed recycling of the insulator of a watertight type polyethylene insulated wire can be constructed.

図1に一実施形態を示し、この実施形態は、図3で示した従来と同様な構成の水密型ポリエチレン絶縁電線Pであって、19本の銅素線(径:2mmφ)11aから構成される公称断面積60mm2の同心撚りの丸撚り導体11の間(内部)及び表面(周り)に、表3に示す硬質水密材12を充填し、その外周に、さらにポリエチレン絶縁体13を被覆した水密型ポリエチレン絶縁電線Pである。なお、比較用として、同表3に示す軟質水密材も作った。表中の「水密材」は、何れもカーボンブラック:0.2PHR(P=per、H=hundred、R=resin)、酸化防止剤:0.1PHRを含む。この実施例では、軟質水密材12は、60℃における硬度がデュロメータTYPE:Aで40未満、硬質水密材12は、60℃における硬度がデュロメータTYPE:Aで40以上を言う。 FIG. 1 shows an embodiment, which is a watertight polyethylene insulated wire P having the same configuration as the conventional one shown in FIG. 3, and is composed of 19 copper strands (diameter: 2 mmφ) 11a. A hard watertight material 12 shown in Table 3 was filled between (inside) and the surface (around) the concentric stranded round conductors 11 having a nominal cross-sectional area of 60 mm 2 , and the outer periphery was further covered with a polyethylene insulator 13. This is a watertight polyethylene insulated wire P. For comparison, soft watertight materials shown in Table 3 were also made. “Watertight material” in the table includes carbon black: 0.2 PHR (P = per, H = hundred, R = resin), and antioxidant: 0.1 PHR. In this embodiment, the soft watertight material 12 has a hardness at 60 ° C. of less than 40 in durometer TYPE: A, and the hard watertight material 12 has a hardness at 60 ° C. of 40 or more in durometer TYPE: A.

Figure 0005360859
Figure 0005360859

その各銅素線11aには、伸線時、その外全周面全長に亘って、イソプロピロアルコール:994gに、ベンゾトリアゾール:5gとエポキシ系大豆油:1gを溶解させた表面処理剤14を塗布した。
ポリエチレン絶縁体13は、使用態様に応じ、新品ポリエチレン単体(比較例1、2、実施例1、2)または、実際に架線・使用されていた非水密型ポリエチレン絶縁電線を撤去回収し、その絶縁被覆を、適当量の酸化防止剤を添加して、絶縁電線の絶縁体として支障なく使用できるように改質後、軟質、硬質の水密材(軟質:実施例4、硬質:実施例3、比較例3、4、5)を19vol%(リサイクル時に混入が予想される最大量)混入したものとした(リサイクルポリエチレン絶縁体とした)。その絶縁体13の特性を表4に示す。
この表4から理解できるように、混入水密材12の硬度にかかわらず、その混入後のリサイクル絶縁体(ポリエチレン)13には同じレベルの硬度の低下が見られる。
Each copper element wire 11a is coated with a surface treatment agent 14 in which benzotriazole: 5 g and epoxy soybean oil: 1 g are dissolved in 994 g of isopropyl alcohol over the entire length of the entire outer circumferential surface at the time of wire drawing. Applied.
The polyethylene insulator 13 removes and collects a new polyethylene simple substance (Comparative Examples 1 and 2 and Examples 1 and 2) or a non-watertight polyethylene insulated wire that has actually been used as an overhead wire depending on the use mode, and insulates it. After coating was modified so that an appropriate amount of antioxidant was added and used as an insulator for insulated wires without any trouble, a soft, hard watertight material (soft: Example 4, hard: Example 3, comparison) Examples 3, 4, and 5) were mixed with 19 vol% (maximum amount expected to be mixed during recycling) (recycled polyethylene insulator). The characteristics of the insulator 13 are shown in Table 4.
As can be understood from Table 4, regardless of the hardness of the mixed watertight material 12, the recycled insulator (polyethylene) 13 after mixing has the same level of hardness reduction.

Figure 0005360859
Figure 0005360859

以上の軟質又は硬質水密材12、リサイクル絶縁体13から成る実施例1〜4及び比較例1〜5において、図4に示す電線皮剥き器((株)古川電機製作所製)Aによる皮剥性及び雨水浸入防止性の結果を表5に示す。
その「皮剥性」は、長さ300mmの電線Pを60℃の恒温槽に浸し、その12時間後に取出し、直ちに、電線皮剥き器Aによる皮剥ぎを行って確認した。その表中、「×」は、「絶縁体13が電線皮剥き器Aと供回りして皮剥ぎが困難であったこと」、「◎」は、「その供回りが生じず、円滑な皮剥ぎが行えたこと」を示す。「○」は「その供回りがほとんどなく皮剥ぎ行えたこと」を示す。
また、「雨水浸入防止性」は、長さ2000mmの電線Pの一端に49kPaの水圧を24時間加え、他端から漏水の有無を調べた。その表中、「×」は、「漏水があったこと」、「○」は、「漏水がなかったこと」を示す。
In Examples 1 to 4 and Comparative Examples 1 to 5 including the soft or hard watertight material 12 and the recycled insulator 13 described above, the peelability by the wire stripper (manufactured by Furukawa Electric Co., Ltd.) A shown in FIG. Table 5 shows the results of rainwater penetration prevention.
The “peeling property” was confirmed by immersing a 300 mm long electric wire P in a 60 ° C. thermostatic bath, taking it out 12 hours later, and immediately peeling it with the electric wire stripper A. In the table, “x” means “insulator 13 was in contact with wire stripper A, and it was difficult to peel off”, “◎” Indicates that stripping has been performed. “◯” indicates that “there was almost no wrapping and the skin could be peeled off”.
In addition, “rainwater intrusion prevention” was performed by applying a water pressure of 49 kPa to one end of an electric wire P having a length of 2000 mm for 24 hours, and examining the presence or absence of water leakage from the other end. In the table, “x” indicates “there was water leak”, and “◯” indicates “there was no water leak”.

Figure 0005360859
Figure 0005360859

この結果から、導体素線11aの表面処理を行い、かつ硬質水密材12を使用した実施例2〜4は、良好な高温皮剥性及び雨水浸入防止性を確保できたが、その一方を欠如した比較例1〜5においては、「皮剥性」、「雨水浸入防止性」の少なくとも一方において、満足できないものであった。
なお、絶縁体に新品のポリエチレンを使用した場合(実施例1)には、表面処理剤14を塗布すれば、水密材12が硬質、軟質どちらでも高温皮剥性及び雨水浸入防止性を確保できるが、表面処理剤と硬質水密材を併用した場合(実施例2)の方がさらに高温皮剥性が円滑となる。
From this result, Examples 2-4 which performed the surface treatment of the conductor strand 11a, and used the hard watertight material 12 were able to ensure good high temperature peeling property and rainwater invasion prevention property, but lacked one of them. In Comparative Examples 1 to 5, at least one of “peelability” and “rainwater intrusion prevention” was not satisfactory.
In addition, when new polyethylene is used for the insulator (Example 1), if the surface treatment agent 14 is applied, it is possible to ensure high-temperature peeling and rainwater invasion prevention regardless of whether the watertight material 12 is hard or soft. In the case where the surface treatment agent and the hard watertight material are used in combination (Example 2), the high temperature peeling property becomes smoother.

上記各実施例は、EEAを主成分とする水密材12の場合であったが、熱可塑性を有し、融点及び硬度が同様な範囲の電気絶縁性樹脂であれば、例えば、上記EVA、EMA、EMMA等の電気絶縁性樹脂であれば、同様な作用効果を得ることができることは勿論である。   Each of the above examples is the case of the watertight material 12 mainly composed of EEA. However, if it is an electrically insulating resin having thermoplasticity and a similar melting point and hardness, for example, the above EVA, EMA Of course, if it is an electrically insulating resin such as EMMA, the same effects can be obtained.

一実施形態の断面図Cross-sectional view of one embodiment 水密材混入量算出用説明図Explanatory diagram for calculating the amount of watertight material 従来例の断面図Cross section of conventional example 絶縁電線の皮剥ぎ作用説明図Explanatory diagram of skinning action of insulated wires

符号の説明Explanation of symbols

A 電線皮剥ぎ器
P 水密型ポリエチレン絶縁電線
1、11 導体
1a、11a 導体素線
2、12 水密材
3、13 絶縁体
14 表面処理剤
A Wire stripping device P Watertight polyethylene insulated wire 1, 11 Conductor 1a, 11a Conductor wire 2, 12 Watertight material 3, 13 Insulator 14 Surface treatment agent

Claims (4)

複数の素線(11a)からなる導体(11)のその各素線(11a、11a)間に電気絶縁性水密材(12)を充填し、その導体(11)の外周面にポリエチレン製絶縁体(13)を被覆した水密型ポリエチレン絶縁電線(P)であって、
上記各素線(11a)表面に上記水密材(12)との密着性を高める表面処理剤(14)が塗布され、前記水密材(12)には熱可塑性の電気絶縁性樹脂が使用されており、
かつ、上記水密材(12)は、その構成樹脂の融点が何れも60℃を超えるものであって、その60℃における硬度がデュロメータTYPE:Aで40以上あるものとして、上記ポリエチレン製絶縁体(13)が60℃以上の高温になった場合において、前記ポリエチレン製絶縁体(13)の皮剥ぎをする際、前記高温により、上記導体(11)と前記ポリエチレン製絶縁体(13)の一体化の維持が失われること、又はポリエチレン製絶縁体(13)の剛性低下によって、電線皮剥ぎ器(A)の回転につれて、その剥ぎ取り部(a)の両側の前記ポリエチレン製絶縁体(b)が供回りすることを抑制するようにしたことを特徴とする水密型ポリエチレン絶縁電線。
An electric insulating watertight material (12) is filled between the strands (11a, 11a) of the conductor (11) composed of a plurality of strands (11a), and a polyethylene insulator is provided on the outer peripheral surface of the conductor (11). A water-tight polyethylene insulated wire (P) coated with (13),
A surface treatment agent (14) for improving adhesion to the watertight material (12) is applied to the surface of each of the strands (11a), and a thermoplastic electrically insulating resin is used for the watertight material (12). And
And upper Symbol watertight material (12), there is the melting point of the constituent resin is in excess of both 60 ° C., the hardness at its 60 ° C. is Durometer TYPE: and as being 40 or more A, manufactured by the polyethylene insulation When the body (13) is at a high temperature of 60 ° C. or higher, when peeling the polyethylene insulator (13), the high temperature causes the conductor (11) and the polyethylene insulator (13) to The polyethylene insulators (b) on both sides of the stripping portion (a) as the wire stripper (A) rotates due to the loss of the maintenance of integration or the decrease in rigidity of the polyethylene insulator (13). ) Is a water-tight type polyethylene insulated electric wire characterized in that it is prevented from circulating.
上記ポリエチレン(13)には、上記水密材(12)が熱可塑性の樹脂からなる水密型ポリエチレン絶縁電線から回収・改質した再生ポリエチレンを使用したことを特徴とする請求項1に記載の水密型ポリエチレン絶縁電線。   The water-tight type according to claim 1, wherein the polyethylene (13) is made of recycled polyethylene recovered and modified from a water-tight type polyethylene insulated wire in which the water-tight material (12) is made of a thermoplastic resin. Polyethylene insulated wire. 上記表面処理剤(14)が、ベンゾトリアゾールと、エポキシ系可塑剤、残部が溶剤からなることを特徴とする請求項1又は2に記載の水密型ポリエチレン絶縁電線。 The watertight polyethylene insulated wire according to claim 1 or 2 , wherein the surface treatment agent (14) is composed of benzotriazole, an epoxy plasticizer, and the balance is a solvent. 上記表面処理剤(14)のベンゾトリアゾールを0.1〜10重量%、エポキシ系可塑剤を0.05〜10重量%としたことを特徴とする請求項に記載の水密型ポリエチレン絶縁電線。 4. The watertight polyethylene insulated wire according to claim 3 , wherein the surface treatment agent (14) is 0.1 to 10% by weight of benzotriazole and 0.05 to 10% by weight of an epoxy plasticizer.
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