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JP5202549B2 - Thin flame retardant wire - Google Patents

Thin flame retardant wire Download PDF

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JP5202549B2
JP5202549B2 JP2010003893A JP2010003893A JP5202549B2 JP 5202549 B2 JP5202549 B2 JP 5202549B2 JP 2010003893 A JP2010003893 A JP 2010003893A JP 2010003893 A JP2010003893 A JP 2010003893A JP 5202549 B2 JP5202549 B2 JP 5202549B2
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flame
flame retardant
diameter
electric wire
insulator layer
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JP2011146147A (en
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一成 木村
伸 吉田
稔 岡下
龍成 宮下
裕一 森下
喜直 児玉
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SWCC Corp
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Description

本発明は、自動車や電子機器等の配線用電線として使用される、外径3mm以下の細径難燃電線に関する。   The present invention relates to a small-diameter flame-retardant electric wire having an outer diameter of 3 mm or less, which is used as a wiring electric wire for automobiles and electronic devices.

近時、自動車や電子機器等の配線用電線として、300V乃至600V級の、細径(外径3mm程度以下)で、かつ難燃性に優れる絶縁電線のニーズがある。   Recently, there is a need for an insulated wire having a small diameter (outer diameter of about 3 mm or less) of 300V to 600V class and excellent in flame retardancy as a wiring wire for automobiles and electronic devices.

従来、この種の用途の300V乃至600V級の低圧絶縁電線としては、単線または撚線からなる導体の外周に、ポリ塩化ビニル、ポリエチレン等のポリオレフィン、これらを架橋させた架橋ポリ塩化ビニル、架橋ポリオレフィン等からなる絶縁体層を設けたものが一般に使用されている。ポリオレフィンや架橋ポリオレフィンには、難燃剤の配合によって難燃性が付与されている。   Conventionally, as a 300V to 600V class low-voltage insulated electric wire for this type of application, a polyolefin such as polyvinyl chloride or polyethylene, a cross-linked polyvinyl chloride or a cross-linked polyolefin obtained by cross-linking these on the outer periphery of a conductor made of a single wire or a stranded wire. Those provided with an insulator layer made of the like are generally used. Flame retardancy is imparted to polyolefins and crosslinked polyolefins by blending flame retardants.

しかしながら、これらの従来の絶縁電線では、絶縁体層の厚さが通常0.3〜0.6mm程度であり、これより薄くすると所要の電気特性、機械的特性を確保することが困難であった。   However, in these conventional insulated wires, the thickness of the insulator layer is usually about 0.3 to 0.6 mm, and if it is thinner than this, it is difficult to ensure the required electrical and mechanical characteristics. .

そこで、ポリ塩化ビニルやポリエチレン等に代わる絶縁材料として、ポリフェニレンオキサイドをポリアミドまたはポリスチレンと混合して変性した2成分系のポリマーアロイを用いた、絶縁体層の厚さが0.1〜0.25mmの電線が開発されてきている(例えば、特許文献1、2参照。)。   Therefore, the insulating layer thickness is 0.1 to 0.25 mm using a two-component polymer alloy in which polyphenylene oxide is mixed with polyamide or polystyrene as an insulating material to replace polyvinyl chloride or polyethylene. Have been developed (for example, see Patent Documents 1 and 2).

しかしながら、この2成分系ポリマーアロイを用いた電線は、高温高湿状態に置かれると絶縁体層の絶縁特性が低下したり、あるいは、そのような絶縁性能の低下が認められない場合でも、耐傷性、耐摩耗性が十分ではないといった問題があった。   However, an electric wire using this two-component polymer alloy is not scratched even when the insulation properties of the insulator layer deteriorate when it is placed in a high-temperature and high-humidity state, or even if such a decrease in insulation performance is not observed. There was a problem that the property and wear resistance were not sufficient.

特開昭63−45915号公報Japanese Unexamined Patent Publication No. 63-45915 特開平4−190510号公報JP-A-4-190510

本発明はこのような従来技術の課題を解決するためになされたもので、細径化、軽量化を図ることができるとともに、高温高湿下での保存、使用によっても絶縁性能の低下がみられず、かつ耐外傷性、耐摩耗性にも優れる細径難燃電線を提供することを目的とする。   The present invention has been made to solve such problems of the prior art, and can achieve a reduction in diameter and weight, and a decrease in insulation performance even when stored and used under high temperature and high humidity. An object of the present invention is to provide a small-diameter flame-retardant electric wire that is not damaged and has excellent trauma resistance and wear resistance.

本発明の第1の態様である細径難燃電線は、導体外周に、絶縁体層およびスキン層を順に有する外径3mm以下の細径難燃電線であって、前記絶縁体層およびスキン層のいずれか一方が、ISO 868に規定するショアD硬度が50以上60未満で、かつASTM D 1238に規定するMFR(250℃、98.1N)が4.0g/10分以上6.0g/10分以下の、変性ポリフェニレンオキサイドをベースとする第1の難燃樹脂からなり、他方が、ASTM D2240に規定するショアA硬度(30秒)が80以上90未満で、かつASTM D 1238に規定するMFR(250℃、98.1N)が7.0g/10分以上8.0g/10分以下の、変性ポリフェニレンオキサイドをベースとする第2の難燃樹脂からなるものである。 The thin flame retardant electric wire according to the first aspect of the present invention is a thin flame retardant electric wire having an outer diameter of 3 mm or less having an insulator layer and a skin layer in order on the outer periphery of the conductor, the insulator layer and the skin layer. Any one of the above has a Shore D hardness specified in ISO 868 of 50 or more and less than 60, and MFR (250 ° C., 98.1 N) specified in ASTM D 1238 is 4.0 g / 10 min or more and 6.0 g. / 10 minutes or less of the first flame retardant resin based on modified polyphenylene oxide, and the other has a Shore A hardness (30 seconds) specified in ASTM D2240 of 80 or more and less than 90 and specified in ASTM D 1238 The second flame retardant resin based on modified polyphenylene oxide having an MFR (250 ° C., 98.1 N) of 7.0 g / 10 min or more and 8.0 g / 10 min or less. .

本発明の第2の態様は、第1の態様である細径難燃電線において、前記絶縁体層が前記第1の難燃樹脂からなり、前記スキン層が前記第2の難燃樹脂からなるものである。   According to a second aspect of the present invention, in the thin flame retardant electric wire according to the first aspect, the insulator layer is made of the first flame retardant resin, and the skin layer is made of the second flame retardant resin. Is.

本発明の第の態様は、第1の態様または第2の態様である細径難燃電線において、前記絶縁体層の厚さが0.05mm以上1.0mm以下であり、前記スキン層の厚さが0.01mm以上0.3mm以下であるものである。 According to a third aspect of the present invention, in the thin flame retardant electric wire according to the first aspect or the second aspect , the thickness of the insulator layer is 0.05 mm or more and 1.0 mm or less, The thickness is 0.01 mm or more and 0.3 mm or less.

本発明の第の態様は、第1の態様乃至第の態様のいずれかの態様である細径難燃電線において、前記第1および第2の難燃樹脂は、ハロゲン系難燃剤を含有しないノンハロゲン難燃樹脂であるものである。 According to a fourth aspect of the present invention, in the thin flame retardant electric wire according to any one of the first to third aspects, the first and second flame retardant resins contain a halogen-based flame retardant. It is a non-halogen flame retardant resin that does not .

本発明の第の態様は、第1の態様乃至第の態様のいずれかの態様である細径難燃電線において、前記絶縁体層およびスキン層は前記第1および第2の難燃樹脂の2層同時押出により形成されてなるものである。 According to a fifth aspect of the present invention, in the thin flame retardant electric wire according to any one of the first to fourth aspects, the insulator layer and the skin layer are the first and second flame retardant resins. It is formed by two-layer coextrusion.

本発明の第の態様は、第1の態様乃至第の態様のいずれかの態様である細径難燃電線において、電線全体として、VW−1燃焼試験(UL1581)に合格する難燃性を有するものである。 According to a sixth aspect of the present invention, in the small-diameter flame-retardant electric wire according to any one of the first to fifth aspects, the entire electric wire has flame retardance that passes the VW-1 combustion test (UL1581). It is what has.

本発明によれば、細径化、軽量化を図ることができるとともに、高温高湿下での保存、使用によっても絶縁性能が低下することはなく、かつ耐外傷性、耐摩耗性にも優れた細径難燃電線を提供することができる。   According to the present invention, the diameter can be reduced and the weight can be reduced, and the insulation performance is not deteriorated even when stored and used under high temperature and high humidity, and also has excellent damage resistance and wear resistance. A small-diameter flame-retardant electric wire can be provided.

本発明の細径難燃電線の一実施形態を示す横断面図である。It is a cross-sectional view which shows one Embodiment of the small diameter flame-retardant electric wire of this invention. 本発明の細径難燃電線の他の実施形態を示す横断面図である。It is a cross-sectional view which shows other embodiment of the small diameter flame-retardant electric wire of this invention.

以下、本発明の実施の形態について、図面を参照して説明する。なお、説明は図面に基づいて行うが、それらの図面は単に図解のために提供されるものであって、本発明はそれらの図面により何ら限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Although the description will be made based on the drawings, the drawings are provided for illustration only, and the present invention is not limited to the drawings.

図1は、本発明の第1の実施形態に係る細径難燃電線を示す横断面図である。   FIG. 1 is a cross-sectional view showing a small-diameter flame-retardant electric wire according to the first embodiment of the present invention.

本実施形態の細径難燃電線は、外径3mm以下の細径難燃電線10である。この細径難燃電線10は、図1に示すように、導体11上に、第1の難燃樹脂からなる絶縁体層12および第2の難燃樹脂からなるスキン層13を順に設けた構造を有する。   The small diameter flame retardant electric wire of this embodiment is a small diameter flame retardant electric wire 10 having an outer diameter of 3 mm or less. As shown in FIG. 1, the small-diameter flame-retardant electric wire 10 has a structure in which an insulator layer 12 made of a first flame-retardant resin and a skin layer 13 made of a second flame-retardant resin are provided on a conductor 11 in this order. Have

導体11は、軟銅線等の導電性金属からなる線材の1本または複数本から構成される。具体的には、例えば28AWG(直径約0.381mm)、22AWG(直径約0.780mm)、または20AWG(直径約0.960mm)の、軟銅線からなる単線導体または撚線導体等が使用される。本実施形態では、導体11は、1本の直径0.127mmの極細軟銅線を中心に、それと同径の極細軟銅線を6本、右撚りに撚り合わせた外径約0.38mmの撚線導体から構成されている。軟銅線は、すずや銀等のめっきが施されていてもよい。   The conductor 11 is composed of one or a plurality of wires made of a conductive metal such as an annealed copper wire. Specifically, for example, 28 AWG (diameter: about 0.381 mm), 22 AWG (diameter: about 0.780 mm), or 20 AWG (diameter: about 0.960 mm), a single conductor or a stranded conductor made of annealed copper wire is used. . In the present embodiment, the conductor 11 is a stranded wire having an outer diameter of about 0.38 mm obtained by twisting six ultra-thin soft copper wires having the same diameter around a very thin soft copper wire having a diameter of 0.127 mm and a right-hand twist. Consists of conductors. The annealed copper wire may be plated with tin or silver.

絶縁体層12を構成する第1の難燃樹脂は、ポリフェニレンオキサイドを、ポリスチレン、6−ナイロン、12−ナイロン等のポリアミド、ポリエチレン、ポリプロピレン、ポリアセタール、ポリフェニレンスルフィド等と混合して変性した相溶系2成分系ポリマーをベースとした樹脂であって、ISO 868に規定するショアD硬度が50以上60未満で、かつASTM D 1238に規定するMFR(250℃、49.1N)が4.0以上6.0以下のものである。ISO 868に規定するショアD硬度およびASTM D 1238に規定するMFR(250℃、49.1N)のいずれか一方でも上記範囲を外れていると、特に、高温高湿下における絶縁特性の長期信頼性を向上させることができない。   The first flame retardant resin constituting the insulator layer 12 is a compatible system 2 in which polyphenylene oxide is modified by mixing with polyamide such as polystyrene, 6-nylon, 12-nylon, polyethylene, polypropylene, polyacetal, polyphenylene sulfide, etc. A resin based on a component-based polymer having a Shore D hardness of 50 or more and less than 60 as defined in ISO 868 and an MFR (250 ° C., 49.1 N) as defined in ASTM D 1238 of 4.0 or more and 6. 0 or less. If either one of Shore D hardness specified in ISO 868 and MFR specified in ASTM D 1238 (250 ° C., 49.1 N) is out of the above range, the long-term reliability of insulation characteristics particularly under high temperature and high humidity Cannot be improved.

また、スキン層13を構成する第2の難燃樹脂は、上記第1の難燃樹脂と同様、ポリフェニレンオキサイドを、ポリスチレン、6−ナイロン、12−ナイロン等のポリアミド、ポリエチレン、ポリプロピレン、ポリアセタール、ポリフェニレンスルフィド等と混合して変性した相溶系2成分系ポリマーをベースとした樹脂であるが、その物性は、ASTM D2240に規定するショアA硬度(30秒)が80以上90未満で、かつASTM D 1238に規定するMFR(250℃、98.1N)が7.0以上8.0以下のものである。ASTM D2240に規定するショアA硬度(30秒)およびASTM D 1238に規定するMFR(250℃、98.1N)のいずれか一方でも上記範囲を外れていると、特に、耐外傷性、耐摩耗性を改善することができない。   The second flame retardant resin constituting the skin layer 13 is made of polyphenylene oxide, such as polystyrene, 6-nylon, 12-nylon, polyamide, polyethylene, polypropylene, polyacetal, polyphenylene, as in the first flame retardant resin. Although it is a resin based on a compatible two-component polymer modified by mixing with sulfide or the like, the physical properties thereof are a Shore A hardness (30 seconds) specified in ASTM D2240 of 80 or more and less than 90, and ASTM D 1238 The MFR (250 ° C., 98.1 N) specified in the above is 7.0 or more and 8.0 or less. If any one of Shore A hardness (30 seconds) specified in ASTM D2240 and MFR (250 ° C., 98.1 N) specified in ASTM D1238 is out of the above range, it is particularly resistant to trauma and abrasion. Can not improve.

第1および第2の難燃樹脂のベースのポリマーとしては、いずれも、相溶性に優れるポリフェニレンオキサイドとポリスチレンとのポリマーアロイが好ましい。   As the base polymer of the first and second flame retardant resins, a polymer alloy of polyphenylene oxide and polystyrene having excellent compatibility is preferable.

第1および第2の難燃樹脂には、必要に応じて難燃剤が配合されていてもよい。ポリフェニレンオキサイドは、それ自身難燃性を有するが、難燃剤を含有させることにより、良好な難燃性を安定して付与することができる。難燃剤としては、ノンハロゲン系難燃剤が好ましく、例えば、リン酸エステル系難燃剤等が例示される。   A flame retardant may be blended in the first and second flame retardant resins as necessary. Polyphenylene oxide itself has flame retardancy, but by adding a flame retardant, good flame retardancy can be stably imparted. As the flame retardant, a non-halogen flame retardant is preferable, and examples thereof include phosphate ester flame retardants.

本発明において特に好ましい第1および第2の難燃樹脂の物性を表1に示す。   Table 1 shows the physical properties of the first and second flame retardant resins particularly preferable in the present invention.

Figure 0005202549
Figure 0005202549

第1および第2の難燃樹脂としてそれぞれ好適に使用される市販品を例示すると、例えば、第1の難燃樹脂としては、SABIC Innovative Plastics社製のNoryl Resin WCA105(商品名)等が挙げられる。また、第2の難燃樹脂としては、SABIC Innovative Plastics社製のNoryl Resin WCA871(商品名)等が挙げられる。Noryl Resin WCA105(WCA105と表記)およびNoryl Resin WCA871(WCA871と表記)の物性を表2に示す。   Examples of commercially available products that are suitably used as the first and second flame retardant resins include, for example, Noryl Resin WCA105 (trade name) manufactured by SABIC Innovative Plastics, and the like. . Examples of the second flame retardant resin include Noryl Resin WCA871 (trade name) manufactured by SABIC Innovative Plastics. Table 2 shows the physical properties of Noryl Resin WCA105 (indicated as WCA105) and Noryl Resin WCA871 (indicated as WCA871).

Figure 0005202549
Figure 0005202549

絶縁体層12およびスキン層13は、上記第1および第2の絶縁樹脂を導体11上に順にまたは同時に押出被覆することにより形成される。その厚さは、絶縁体層12が、通常、0.05mm以上1.0mm以下、好ましくは0.08mm以上0.8mm以下の範囲であり、スキン層13が、通常、0.01mm以上0.3mm以下、好ましくは0.02mm以上0.2mm以下の範囲である。絶縁体層12の厚さが0.05mm未満では、高温高湿下における絶縁特性の長期信頼性を十分に向上させることができないおそれがあり、絶縁体層12の厚さが1.0mmを超えると、細径化、軽量化を十分に図ることができなくなるおそれがある。また、スキン層13の厚さが0.01mm未満では、耐外傷性、耐摩耗性が不十分になるおそれがあり、スキン層13の厚さが0.3mmを超えると、細径化、軽量化を十分に図ることができなくなるおそれがある。   The insulator layer 12 and the skin layer 13 are formed by extrusion-coating the first and second insulating resins on the conductor 11 in order or simultaneously. The thickness of the insulator layer 12 is usually 0.05 mm or more and 1.0 mm or less, preferably 0.08 mm or more and 0.8 mm or less, and the skin layer 13 is usually 0.01 mm or more and 0.00 mm or less. It is 3 mm or less, preferably 0.02 mm or more and 0.2 mm or less. If the thickness of the insulator layer 12 is less than 0.05 mm, the long-term reliability of the insulation characteristics under high temperature and high humidity may not be sufficiently improved, and the thickness of the insulator layer 12 exceeds 1.0 mm. Then, there is a possibility that it is impossible to sufficiently reduce the diameter and weight. Further, if the thickness of the skin layer 13 is less than 0.01 mm, the damage resistance and wear resistance may be insufficient. If the thickness of the skin layer 13 exceeds 0.3 mm, the diameter is reduced and the weight is reduced. There is a risk that it will not be possible to achieve sufficient conversion.

このように構成される細径難燃電線においては、導体11の外周に、それぞれ変性ポリフェニレンオキサイドをベースとする特定の物性を持った樹脂材料からなる絶縁体層12およびスキン層13を順に備えている。絶縁体層12を構成する第1の難燃樹脂は、
高温高湿下での保存、使用によっても低下することのない良好な絶縁性能を有しており、一方、スキン層12を構成する第2の難燃樹脂は、優れた耐外傷性、耐摩耗性を有している。これにより、細径化、軽量化を図ることができるとともに、高温高湿下での保存、使用による絶縁性能の低下を防止することができ、かつ優れた耐外傷性、耐摩耗性を備えることができる。したがって、上記細径難燃電線は、自動車や電子機器等の配線用電線として有用である。
In the thin flame retardant electric wire configured as described above, an insulator layer 12 and a skin layer 13 made of a resin material having specific properties based on modified polyphenylene oxide are sequentially provided on the outer periphery of the conductor 11. Yes. The first flame retardant resin constituting the insulator layer 12 is:
It has good insulation performance that does not deteriorate even when stored and used under high temperature and high humidity. On the other hand, the second flame retardant resin constituting the skin layer 12 has excellent trauma resistance and abrasion resistance. It has sex. As a result, it is possible to reduce the diameter and weight, to prevent deterioration of the insulation performance due to storage and use under high temperature and high humidity, and to have excellent damage resistance and wear resistance. Can do. Therefore, the above-mentioned small-diameter flame-retardant electric wire is useful as a wiring electric wire for automobiles and electronic devices.

以上説明した実施形態では、絶縁体層12を第1の難燃樹脂により、また、スキン層13を第2の難燃樹脂により形成しているが、絶縁体層12を第2の難燃樹脂により、また、スキン層13を第1の難燃樹脂により形成してもよい。   In the embodiment described above, the insulator layer 12 is formed of the first flame retardant resin and the skin layer 13 is formed of the second flame retardant resin. However, the insulator layer 12 is formed of the second flame retardant resin. Further, the skin layer 13 may be formed of the first flame retardant resin.

すなわち、図2は本発明の第2の実施形態に係る断面図である。本実施形態に係る細径難燃電線20は、第1の実施形態において、導体11上に、第1の難燃樹脂からなる絶縁体層12および第2の難燃樹脂からなるスキン層13に代えて、第2の難燃樹脂からなる絶縁体層22および第1の難燃樹脂からなるスキン層23を順に設けたものである。   That is, FIG. 2 is a cross-sectional view according to the second embodiment of the present invention. In the first embodiment, the small-diameter flame-retardant electric wire 20 according to the present embodiment is formed on the conductor 11 on the insulator layer 12 made of the first flame-retardant resin and the skin layer 13 made of the second flame-retardant resin. Instead, the insulating layer 22 made of the second flame retardant resin and the skin layer 23 made of the first flame retardant resin are sequentially provided.

このように構成される細径難燃電線20においても、導体11の外周に、それぞれ変性ポリフェニレンオキサイドをベースとする特定の物性を持った樹脂材料からなる絶縁体層22およびスキン層23を順に備えている。絶縁体層22を構成する第2の難燃樹脂は、優れた耐外傷性、耐摩耗性を有しており、一方、スキン層22を構成する第2の難燃樹脂は、高温高湿下での保存、使用によっても低下することのない良好な絶縁性能を有している。これにより、細径化、軽量化を図ることができるとともに、高温高湿下での保存、使用によって絶縁性能が低下することはなく、かつ優れた耐外傷性、耐摩耗性を備えることができ、自動車や電子機器等の配線用電線として好適に使用される。   Also in the small-diameter flame retardant electric wire 20 configured as described above, an insulator layer 22 and a skin layer 23 made of a resin material having specific properties based on modified polyphenylene oxide are sequentially provided on the outer periphery of the conductor 11. ing. The second flame retardant resin constituting the insulator layer 22 has excellent trauma resistance and wear resistance, while the second flame retardant resin constituting the skin layer 22 is under high temperature and high humidity. It has good insulation performance that does not deteriorate even when stored and used. As a result, the diameter and weight can be reduced, the insulation performance does not deteriorate due to storage and use under high temperature and high humidity, and it has excellent trauma resistance and wear resistance. It is suitably used as an electric wire for wiring of automobiles and electronic devices.

次に、本発明を実施例によりさらに詳細に説明するが、本発明はこれらの実施例に何ら限定されるものではない。   EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples at all.

実施例1〜3
28AWGのすずめっき軟銅撚線導体(7本/0.127mm)上に、Noryl Resin WCA871(商品名)およびNoryl Resin WCA105(商品名)をこの順で2層同時押出により被覆して、厚さ0.18mm、0.35mm、0.76mmの絶縁体層、および厚さ0.05mm、0.07mm、0.07mmのスキン層を形成し、外径約0.9mm、約1.62mm、約2.62mmの絶縁電線を製造した。
Examples 1-3
28 AWG tin-plated annealed copper stranded conductor (7 pieces / 0.127 mm) was coated with Noryl Resin WCA871 (trade name) and Noryl Resin WCA105 (trade name) in this order by two-layer coextrusion to obtain a thickness of 0 An insulator layer of .18 mm, 0.35 mm, and 0.76 mm and a skin layer of 0.05 mm, 0.07 mm, and 0.07 mm in thickness are formed, and the outer diameter is about 0.9 mm, about 1.62 mm, and about 2 An insulated wire of .62 mm was manufactured.

実施例4〜6
28AWGのすずめっき軟銅撚線導体(7本/0.127mm)上に、Noryl Resin WCA105(商品名)およびNoryl Resin WCA871(商品名)をこの順で2層同時押出により被覆して、厚さ0.18mm、0.35mm、0.76mmの絶縁体層、および厚さ0.05mm、0.07mm、0.07mmのスキン層を形成し、外径約0.9mm、約1.62mm、約2.62mmの絶縁電線を製造した。
Examples 4-6
28 AWG tin-plated annealed copper stranded conductor (7 pieces / 0.127 mm) was coated with Noryl Resin WCA105 (trade name) and Noryl Resin WCA871 (trade name) in this order by two-layer coextrusion to obtain a thickness of 0 An insulator layer of .18 mm, 0.35 mm, and 0.76 mm and a skin layer of 0.05 mm, 0.07 mm, and 0.07 mm in thickness are formed, and the outer diameter is about 0.9 mm, about 1.62 mm, and about 2 An insulated wire of .62 mm was manufactured.

比較例1
28AWGのすずめっき軟銅撚線導体(7本/0.127mm)上に、Noryl Resin WCA871(商品名)を押出被覆して、厚さ0.20mmの絶縁体層を形成し、外径約0.88mmの絶縁電線を製造した。
Comparative Example 1
A 28-AWG tin-plated annealed copper stranded conductor (7 pieces / 0.127 mm) was extrusion coated with Noryl Resin WCA871 (trade name) to form an insulator layer having a thickness of 0.20 mm. An 88 mm insulated wire was manufactured.

比較例2
28AWGのすずめっき軟銅撚線導体(7本/0.127mm)上に、Noryl Resin WCA105(商品名)を押出被覆して、厚さ0.20mmの絶縁体層を形成し、外径約0.88mmの絶縁電線を製造した。
Comparative Example 2
On 28 AWG tin-plated annealed copper stranded conductor (7 pieces / 0.127 mm), Noryl Resin WCA105 (trade name) is extrusion coated to form an insulator layer having a thickness of 0.20 mm and an outer diameter of about 0. An 88 mm insulated wire was manufactured.

比較例3
28AWGのすずめっき軟銅撚線導体(7本/0.127mm)上に、軟質塩化ビニル樹脂(PVCと表記)を押出被覆して、厚さ0.22mmの絶縁体層を形成し、外径約0.98mmの絶縁電線を製造した。
Comparative Example 3
28 AWG tin-plated annealed copper stranded wire conductor (7 / 0.127mm) is extrusion coated with soft vinyl chloride resin (indicated as PVC) to form an insulator layer with a thickness of 0.22mm. A 0.98 mm insulated wire was manufactured.

比較例4
28AWGのすずめっき軟銅撚線導体(7本/0.127mm)上に、難燃ポリエチレン樹脂(難燃PEと表記)を押出被覆して、厚さ0.22mmの絶縁体層を形成し、外径約0.98mmの絶縁電線を製造した。
Comparative Example 4
A 28 AWG tin-plated annealed copper stranded conductor (7 / 0.127 mm) is extrusion coated with a flame retardant polyethylene resin (indicated as flame retardant PE) to form an insulator layer having a thickness of 0.22 mm. An insulated wire having a diameter of about 0.98 mm was manufactured.

得られた絶縁電線について、下記に示す方法で各種特性を評価した。
[耐電圧]
UL758の規定に準拠し、1時間、水中に放置した電線サンプルについて、2000Vの電圧を60秒間印加して、絶縁層が破壊するか否かを観察した。
[絶縁性能の長期信頼性]
長さ5mの電線サンプルを、85℃、85%RHの高温高湿下に10週間放置し、室温まで冷却後、耐電圧試験を行った。
[耐摩耗性]
ISO 6722に規定されるスクレープ摩耗試験に準拠する摩耗試験機(安田精機製作所製)を用い、導体の軟銅線が露出するまでの摩耗回数(スクレープ回数)を測定した。
[難燃性]
UL1581 1080に規定されるVW−1燃焼試験を行い、その合否を判定した。
[引張強さおよび伸び]
UL1581の規定に準拠し、長さ150mmの電線から内部の導体を引き抜いて作成した環状の試験片について、引張速度500mm/分および標点距離25mmの条件で測定した。
[熱老化後の引張強さ残率および伸び残率]
UL1581の規定に準拠し、長さ150mmの電線から内部の導体を引き抜いて作成した環状の試験片について、136℃×168時間の熱老化条件で測定した。
About the obtained insulated wire, various characteristics were evaluated by the method shown below.
[Withstand voltage]
In accordance with the regulations of UL758, a voltage of 2000 V was applied for 60 seconds to observe whether or not the insulating layer was broken for a wire sample left in water for 1 hour.
[Long-term reliability of insulation performance]
A 5 m long wire sample was left under high temperature and high humidity of 85 ° C. and 85% RH for 10 weeks, cooled to room temperature, and then subjected to a withstand voltage test.
[Abrasion resistance]
A wear tester (manufactured by Yasuda Seiki Seisakusho) based on a scrape wear test specified in ISO 6722 was used to measure the number of wears (scraps) until the annealed copper wire was exposed.
[Flame retardance]
The VW-1 combustion test prescribed | regulated to UL1581 1080 was done and the pass / fail was determined.
[Tensile strength and elongation]
In accordance with the regulations of UL1581, an annular test piece prepared by drawing an internal conductor from an electric wire having a length of 150 mm was measured under the conditions of a tensile speed of 500 mm / min and a gauge distance of 25 mm.
[Remaining tensile strength and elongation after heat aging]
In accordance with the regulations of UL1581, an annular test piece prepared by drawing an internal conductor from an electric wire having a length of 150 mm was measured under a heat aging condition of 136 ° C. × 168 hours.

これらの結果を、被覆の構成とともに表3に示す。   These results are shown in Table 3 together with the coating composition.

Figure 0005202549
Figure 0005202549

表3から明らかなように、実施例に係る絶縁電線は、細径で、かつ良好な難燃性を有しながら、絶縁特性、その長期信頼性および耐摩耗性にも優れていた。これに対し、比較例1では、耐摩耗性が不良であり、比較例2では、絶縁性能の長期信頼性が不良であった。
さらに、比較例3、4では、難燃性が不良であった。
As is apparent from Table 3, the insulated wire according to the example was excellent in insulation characteristics, long-term reliability, and wear resistance while having a small diameter and good flame retardancy. On the other hand, in Comparative Example 1, the wear resistance was poor, and in Comparative Example 2, the long-term reliability of the insulation performance was poor.
Furthermore, in Comparative Examples 3 and 4, the flame retardancy was poor.

11…導体、12…第1の難燃樹脂からなる絶縁体層、13…第2の難燃樹脂からなるスキン層、22…第2の難燃樹脂からなる絶縁体層、23…第1の難燃樹脂からなるスキン層。   DESCRIPTION OF SYMBOLS 11 ... Conductor, 12 ... Insulator layer which consists of 1st flame retardant resin, 13 ... Skin layer which consists of 2nd flame retardant resin, 22 ... Insulator layer which consists of 2nd flame retardant resin, 23 ... 1st Skin layer made of flame retardant resin.

Claims (6)

導体外周に、絶縁体層およびスキン層を順に有する外径3mm以下の細径難燃電線であって、
前記絶縁体層およびスキン層のいずれか一方が、ISO 868に規定するショアD硬度が50以上60未満で、かつASTM D 1238に規定するMFR(250℃、98.1N)が4.0g/10分以上6.0g/10分以下の、変性ポリフェニレンオキサイドをベースとする第1の難燃樹脂からなり、他方が、ASTM D2240に規定するショアA硬度(30秒)が80以上90未満で、かつASTM D 1238に規定するMFR(250℃、98.1N)が7.0g/10分以上8.0g/10分以下の、変性ポリフェニレンオキサイドをベースとする第2の難燃樹脂からなることを特徴とする細径難燃電線。
A small-diameter flame-retardant electric wire having an outer diameter of 3 mm or less and having an insulator layer and a skin layer in order on the outer periphery of the conductor,
Any one of the insulator layer and the skin layer has a Shore D hardness of 50 or more and less than 60 as defined in ISO 868 and an MFR (250 ° C., 98.1 N) as defined in ASTM D 1238 of 4.0 g / 10% or more and 6.0 g / 10 minutes or less of the first flame retardant resin based on modified polyphenylene oxide, and the other has a Shore A hardness (30 seconds) specified in ASTM D2240 of 80 or more and less than 90 And a second flame retardant resin based on modified polyphenylene oxide having an MFR (250 ° C., 98.1 N) specified in ASTM D 1238 of 7.0 g / 10 min or more and 8.0 g / 10 min or less. A small-diameter flame-retardant electric wire characterized by
前記絶縁体層が前記第2の難燃樹脂からなり、前記スキン層が前記第1の難燃樹脂からなることを特徴とする請求項1記載の細径難燃電線。   The small-diameter flame-retardant electric wire according to claim 1, wherein the insulator layer is made of the second flame-retardant resin, and the skin layer is made of the first flame-retardant resin. 前記絶縁体層の厚さが0.05mm以上1.0mm以下であり、前記スキン層の厚さが0.01mm以上0.3mm以下であることを特徴とする請求項1または2記載の細径難燃電線。 3. The small diameter according to claim 1, wherein the insulator layer has a thickness of 0.05 mm to 1.0 mm, and the skin layer has a thickness of 0.01 mm to 0.3 mm. Flame retardant wire. 前記第1および第2の難燃樹脂は、ハロゲン系難燃剤を含有しないノンハロゲン難燃樹脂であることを特徴とする請求項1乃至のいずれか1項記載の細径難燃電線。 It said first and second flame retardant resin thin flame retardant line of any one of claims 1 to 3 wherein the halogenated flame retardant is free no non-halogen flame retardant resin. 前記絶縁体層およびスキン層は前記第1および第2の難燃樹脂の2層同時押出により形成されてなることを特徴とする請求項1乃至のいずれか1項記載の細径難燃電線。 The insulator layer and thin flame retardant lines of the skin layer is any one of claims 1 to 4, characterized by being formed by two layers coextrusion of the first and second flame retardant resin . 電線全体として、VW−1燃焼試験(UL1581)に合格する難燃性を有することを特徴とする請求項1乃至のいずれか1項記載の細径難燃電線。 The small-diameter flame-retardant electric wire according to any one of claims 1 to 5 , wherein the electric wire as a whole has flame retardancy that passes the VW-1 combustion test (UL1581).
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