JPH11213771A - Fire resistant wire - Google Patents
Fire resistant wireInfo
- Publication number
- JPH11213771A JPH11213771A JP10012795A JP1279598A JPH11213771A JP H11213771 A JPH11213771 A JP H11213771A JP 10012795 A JP10012795 A JP 10012795A JP 1279598 A JP1279598 A JP 1279598A JP H11213771 A JPH11213771 A JP H11213771A
- Authority
- JP
- Japan
- Prior art keywords
- fire
- layer
- silicone rubber
- mica
- resistant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Organic Insulating Materials (AREA)
- Insulated Conductors (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、火災等によって高
熱や火炎等に曝されてもなお長時間の使用に堪え得る、
合成樹脂絶縁層を有する耐火電線に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of withstanding use for a long time even when exposed to high heat or flame due to a fire or the like.
The present invention relates to a fire-resistant electric wire having a synthetic resin insulating layer.
【0002】[0002]
【従来の技術】一般に、劇場やデパート等の多数の人が
集まる場所においては、火災等の非常事態が発生した際
に、場内にいる人を安全に非常口に誘導する必要があ
る。このような場合、非常口案内灯そのものが破壊され
なくても、送電用の電線が高熱や火炎等に曝された場合
には、電線が短時間で短絡を起こして送電が停止する事
態が起こる恐れがある。しかし、非常口案内灯は一定の
時間点灯していることが要求されるので、非常口案内灯
に給電するための電線としては、高熱や火炎等に曝され
た場合でも絶縁が破壊されず、電力の供給が可能なこと
が必要である。2. Description of the Related Art Generally, in places where many people gather, such as theaters and department stores, when an emergency such as a fire occurs, it is necessary to safely guide people in the hall to an emergency exit. In such a case, even if the emergency exit guide light itself is not destroyed, if the power transmission wire is exposed to high heat, flame, etc., a short circuit may occur in a short time and the power transmission may stop. There is. However, since the emergency exit guide light is required to be lit for a certain period of time, the electric wire for supplying power to the emergency exit guide light does not break the insulation even when exposed to high heat, flame, etc. It must be possible to supply.
【0003】このような目的で用いられる耐火電線に
は、図2に示すような構造を有するものがある。すなわ
ち、耐火電線1は、導体2の外周に耐火層3が形成され
ており、その外周をポリエチレンからなる絶縁層4で被
覆し、更にその外周にシース5を被覆して形成されてい
る。この耐火電線1の耐火層3は、ガラス繊維布やポリ
エチレンフィルムなどの基材膜にマイカ層を貼り合わせ
て形成された集成マイカシートからなる、厚さ0.01
〜0.2mm程度の耐火テープなどを巻き付けて構成され
たものである。[0003] Some refractory wires used for such a purpose have a structure as shown in FIG. That is, the fire-resistant electric wire 1 is formed by forming a fire-resistant layer 3 on the outer periphery of a conductor 2, covering the outer periphery with an insulating layer 4 made of polyethylene, and further covering the outer periphery with a sheath 5. The fireproof layer 3 of the fireproof electric wire 1 is made of a mica sheet formed by bonding a mica layer to a base film such as a glass fiber cloth or a polyethylene film, and has a thickness of 0.01 m.
It is formed by winding a fire-resistant tape of about 0.2 mm or so.
【0004】かかる耐火電線は、消防庁告示第7号によ
って定められた耐火認定基準(30分間で840℃まで
加熱した直後の絶縁抵抗値が0.4MΩ以上で、絶縁耐
圧が1500V、1分耐圧)を満足するために、上記の
ような耐火テープ2〜3枚を1/2〜1/4重ねて巻き
付けるか、又は縦添えで巻き付けて製造されていたた
め、耐火層の厚さが300〜1200μmとなり、耐火
層の上にシースを被覆すると電線が太くなって、可撓性
が悪いばかりでなく軽量化ができず、取扱性が悪いとい
う難点があった。[0004] Such a fire-resistant electric wire has a fire resistance certification standard defined by the Fire Service Agency Notification No. 7 (the insulation resistance immediately after heating to 840 ° C for 30 minutes is 0.4 MΩ or more, the withstand voltage is 1500 V, and the withstand voltage is 1 minute. In order to satisfy condition (2), the above-mentioned two or three refractory tapes are wound by 1 / to 4 overlap or wound vertically, so that the thickness of the refractory layer is 300 to 1200 μm. When the sheath is coated on the refractory layer, the electric wire becomes thicker, and not only the flexibility is poor but also the weight cannot be reduced, and there is a problem that the handleability is poor.
【0005】そこで近年は、セラミックス粒子とシリコ
ーン系樹脂とを含む塗料溶液の中に、導体を浸漬し走行
させるディッピング法を用いて、導体上にセラミックス
被膜の耐火層を形成させる方法(例えば特公昭63−3
7922号)などが提案されている。しかしこの方法で
は、一般的な耐熱絶縁性や耐電圧特性をもたせることは
できるが、上記の消防庁告示第7号による耐火認定基準
である、840℃以上の高温での絶縁特性や耐電圧特性
を満足するには充分ではなかった。Therefore, in recent years, a method of forming a refractory layer of a ceramic film on a conductor by using a dipping method in which a conductor is immersed in a coating solution containing ceramic particles and a silicone-based resin and run (for example, Japanese Patent Publication No. 63-3
No. 7922). However, this method can provide general heat-resistant insulation and withstand voltage characteristics, but the insulation and withstand voltage characteristics at high temperatures of 840 ° C. or higher, which are the fire resistance certification standards according to the Fire Service Agency Notification No. 7 above. Was not enough to satisfy
【0006】また、耐火電線の耐熱性を前記の消防庁告
示の耐火認定基準に適合させるために、上記のディッピ
ング法を改良して、メチルフェニルシリコーン系樹脂と
希釈剤とシランカップリング剤と3μm以下の粒径のタ
ルクとからなる混合液中に導体をディッピングして耐火
層を形成し、更にこの耐火層の上にポリエチレン等の絶
縁体を被覆し、更にシースを被覆して構成した耐火電線
も提案されている(特開平7−105733号)。Further, in order to conform the heat resistance of the fire-resistant electric wire to the fire resistance certification standard notified by the Fire and Disaster Management Agency, the above-mentioned dipping method is improved, and a methylphenyl silicone resin, a diluent, a silane coupling agent and 3 μm A fire-resistant electric wire formed by dipping a conductor into a mixture of talc having the following particle size to form a fire-resistant layer, further covering the fire-resistant layer with an insulator such as polyethylene, and further covering a sheath. Has also been proposed (JP-A-7-105733).
【0007】しかし、近時には更に長時間の耐火性能が
要求されるに至り、上記のような改良された耐火電線で
は、単線導体を用いた場合であっても、火熱に1時間曝
された後の925℃には耐えることが困難であった。し
かも施工性が要求される用途向けに可撓性の高い撚線導
体を用いようとすると、耐火層の厚さが不均一になるば
かりでなく表面の平滑性も失われるため、電線の耐電圧
特性が低下して、長時間の耐火認定基準を満たすことが
できなくなるという問題があった。However, recently, fire resistance for a longer time has been required. In the improved fire-resistant electric wire as described above, even if a single-wire conductor is used, the fire-resistant electric wire is exposed to fire heat for one hour. Of 925 ° C. was difficult. In addition, when using a highly flexible stranded wire conductor for applications requiring workability, not only the thickness of the refractory layer becomes uneven, but also the smoothness of the surface is lost. There is a problem that the characteristics are deteriorated and it is not possible to satisfy the long-term fire resistance certification standard.
【0008】[0008]
【発明が解決しようとする課題】本発明は、撚線導体を
用いても単線導体を用いた場合と同様に、火熱に長時間
の曝されたときの925℃という高温においても、優れ
た耐火絶縁特性と耐電圧特性とを保持する耐火電線を提
供することを目的としたものである。SUMMARY OF THE INVENTION The present invention provides excellent fire resistance even at a high temperature of 925.degree. C. when exposed to fire heat for a long time, similarly to the case of using a stranded conductor and a single wire conductor. It is an object of the present invention to provide a fire-resistant wire that maintains insulation characteristics and withstand voltage characteristics.
【0009】[0009]
【課題を解決するための手段】上記の本発明の目的は、
シリコーンゴムに酸化チタン又はカーボンブラックの少
なくとも一方とホウ酸亜鉛と粉末マイカとを配合したゴ
ム組成物を過酸化物系加硫剤と白金系触媒とで架橋して
なる耐火ゴム層と、集成マイカシートからなる耐火補強
層とを、線状導体の周囲に順次に設けた耐火線芯に対し
て、更に絶縁層とシースとを順次に被覆してなることを
特徴とする耐火電線によって、達成することができる。SUMMARY OF THE INVENTION The object of the present invention is as follows.
A fire-resistant rubber layer obtained by crosslinking a rubber composition obtained by mixing at least one of titanium oxide or carbon black, zinc borate and powder mica with a silicone rubber with a peroxide-based vulcanizing agent and a platinum-based catalyst; This is achieved by a fire-resistant electric wire characterized in that a fire-resistant reinforcing layer composed of a sheet and a fire-resistant wire core sequentially provided around a linear conductor are further coated with an insulating layer and a sheath in that order. be able to.
【0010】更に、かかる本発明の耐火電線において、
耐火ゴム層に配合される酸化チタン又はカーボンブラッ
クは、シリコーンゴム100重量部に対して15重量部
以下配合されることが好ましい。また耐火ゴム層に配合
されるホウ酸亜鉛の配合量は、シリコーンゴム100重
量部に対して15重量部以下であることが好ましい。そ
して、耐火ゴム層に配合される粉末マイカは、径が50
μm以上であることが好ましく、その配合量はシリコー
ンゴム100重量部に対して250重量部以下であるこ
とが好ましい。Further, in the refractory wire of the present invention,
It is preferable that titanium oxide or carbon black blended in the refractory rubber layer is blended in an amount of 15 parts by weight or less based on 100 parts by weight of silicone rubber. The amount of zinc borate to be added to the fire-resistant rubber layer is preferably 15 parts by weight or less based on 100 parts by weight of the silicone rubber. The powder mica mixed in the fire-resistant rubber layer has a diameter of 50 m.
It is preferably at least μm, and the compounding amount is preferably at most 250 parts by weight based on 100 parts by weight of the silicone rubber.
【0011】[0011]
【発明の実施の形態】本発明の耐火電線は、本質的に図
1に示すように従来の耐火電線と同様な構造を有してい
るが、その耐火層3は耐火ゴム層3aと耐火補強層3b
とからなっている。そして耐火ゴム層3aは、無機耐火
剤としての粉末マイカと、難燃剤としてのホウ酸亜鉛に
加えて、酸化チタン又はカーボンブラックの少なくとも
一方を配合した特定の組成のシリコーンゴム組成物を、
線状導体の周囲に押出被覆する方法で形成され、また耐
火補強層3bは、補強基材上にフレーク状マイカを層状
に接着したテープ状の集成マイカシートを、前記の耐火
ゴム層3aの上に少なくも1回巻き付けて形成されてい
る点で、従来の耐火電線と異なっている。しかしこのよ
うな構造の耐火層3を設けた耐火線芯の上に、更に絶縁
層4を被覆し、また絶縁層4の上にシース5を被覆する
点については、従来の耐火電線と同様である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fire-resistant electric wire according to the present invention has a structure essentially similar to that of a conventional fire-resistant electric wire as shown in FIG. 1, except that a fire-resistant layer 3 has a fire-resistant rubber layer 3a and a fire-resistant reinforcement. Layer 3b
It consists of Then, the fire-resistant rubber layer 3a, in addition to powder mica as an inorganic fire retardant, and zinc borate as a flame retardant, a silicone rubber composition of a specific composition blended with at least one of titanium oxide or carbon black,
The fire-resistant reinforcing layer 3b is formed by extrusion coating around the linear conductor, and the fire-resistant reinforcing layer 3b is a tape-shaped laminated mica sheet in which flake-like mica is adhered in a layer on a reinforcing base material. Is different from the conventional fire-resistant electric wire in that it is formed by winding at least once. However, the point that the insulating layer 4 is further coated on the refractory wire core provided with the refractory layer 3 having such a structure and the sheath 5 is coated on the insulating layer 4 is the same as the conventional refractory wire. is there.
【0012】本発明の耐火電線において、耐火ゴム層に
用いられるシリコーンゴムは、好ましくはHTVと呼ば
れるものなどのミラブル型シリコーンゴムが用い得る
が、線状導体上に所望の厚さで被覆できるものであれ
ば、これに限られるものではない。かかるシリコーンゴ
ムとしては、例えばジメチル系、メチルビニル系、メチ
ルフェニルビニル系、メチルフルオロアルキル系などの
官能基を含む重合体を挙げることができる。In the fire-resistant electric wire of the present invention, the silicone rubber used for the fire-resistant rubber layer is preferably a millable silicone rubber such as one called HTV, but it can be coated on the linear conductor to a desired thickness. If so, it is not limited to this. Examples of such silicone rubber include polymers containing a functional group such as dimethyl, methylvinyl, methylphenylvinyl, and methylfluoroalkyl.
【0013】前記のシリコーンゴムに配合される加硫剤
としては、例えばジクミルパーオキシド、ジベンゾイル
パーオキシド、ジ−2,4、ジクロロベンゾイルパーオ
キシド、過安息香酸−t−ブチル等の有機過酸化物など
が挙げられるが、かかる加硫剤は、それぞれ使用するシ
リコーンゴムの種類と所望の加硫条件に応じて適宜選択
することができる。また前記の加硫剤と併用される白金
系触媒は、電線の耐火特性の向上に顕著な効果がある
が、通常シリコーンゴムの架橋用として用いられている
ものであれば、利用することができる。これらの加硫剤
や白金系触媒の配合量は適宜決定することができるが、
通常、シリコーンゴムに対して加硫剤が1〜3重量%の
範囲、また白金系触媒が0.1〜0.5重量%の範囲で
あってよい。Examples of the vulcanizing agent to be blended with the silicone rubber include organic peroxides such as dicumyl peroxide, dibenzoyl peroxide, di-2,4, dichlorobenzoyl peroxide, and t-butyl perbenzoate. Oxides and the like can be mentioned, and such vulcanizing agents can be appropriately selected according to the type of silicone rubber used and desired vulcanizing conditions. The platinum-based catalyst used in combination with the vulcanizing agent has a remarkable effect on improving the fire resistance of the electric wire, but can be used as long as it is generally used for crosslinking silicone rubber. . The amounts of these vulcanizing agents and platinum-based catalysts can be determined as appropriate,
Usually, the vulcanizing agent may be in the range of 1 to 3% by weight, and the platinum-based catalyst may be in the range of 0.1 to 0.5% by weight, based on the silicone rubber.
【0014】本発明の耐火電線の耐火ゴム層において、
シリコーンゴムに配合される無機充填剤としては、珪酸
質の充填剤などのうち、耐熱性の面から粉末マイカを用
いるが、中でも粒度(平均粒径)が50μm以上の粉末
マイカが好ましい。またその粒径分布としては、均一分
散の点から最大粒径が2.5mmを越えないものであるこ
とが望ましい。かかる粉末マイカの配合量は、シリコー
ンゴム100重量部当たり250重量部以下、特に10
〜200重量部の範囲であることが望ましい。粉末マイ
カの配合量が10重量部より少ないときは耐火性の改良
効果が大きくなく、また250重量部より多いときは耐
電圧特性が損なわれるから、何れも好ましくない。In the fire-resistant rubber layer of the fire-resistant wire of the present invention,
As the inorganic filler compounded in the silicone rubber, powdered mica is used among silicic fillers and the like from the viewpoint of heat resistance. Among them, powdered mica having a particle size (average particle size) of 50 μm or more is preferable. The particle size distribution is preferably such that the maximum particle size does not exceed 2.5 mm from the viewpoint of uniform dispersion. The amount of such powdered mica is 250 parts by weight or less, especially 10 parts by weight, per 100 parts by weight of silicone rubber.
It is desirably in the range of 200 to 200 parts by weight. If the amount of the powdered mica is less than 10 parts by weight, the effect of improving the fire resistance is not large, and if it is more than 250 parts by weight, the withstand voltage characteristics are impaired, so neither is preferable.
【0015】上記のような粉末マイカを充填したシリコ
ーンゴムには、更に耐火性を高めるために難燃剤を配合
するが、かかる難燃剤としては、特にホウ酸亜鉛が好ま
しく用いられる。例えば水酸化アルミニウム、水酸化マ
グネシウム等の金属水酸化物や、三酸化アンチモンなど
の通常の無機系難燃剤では、良い結果は得られない。ホ
ウ酸亜鉛の配合量は、シリコーンゴム100重量部当た
り0.1〜15重量部程度とすることが好ましい。A flame retardant is added to the silicone rubber filled with the powdered mica as described above in order to further improve the fire resistance. As such a flame retardant, zinc borate is particularly preferably used. For example, good results cannot be obtained with metal hydroxides such as aluminum hydroxide and magnesium hydroxide and ordinary inorganic flame retardants such as antimony trioxide. The amount of zinc borate is preferably about 0.1 to 15 parts by weight per 100 parts by weight of silicone rubber.
【0016】更に本発明におけるシリコーンゴムには、
耐火性の一層の向上のための難燃助剤として、酸化チタ
ン又はカーボンブラックが配合されるが、これらはいず
れか一方であってもよく、或いは併用してもよい。酸化
チタン又はカーボンブラックの配合量は、その合計量で
シリコーンゴム100重量部当たり0.1〜15重量部
程度であることが好ましい。Further, the silicone rubber in the present invention includes:
Titanium oxide or carbon black is blended as a flame retardant aid for further improving fire resistance, either of which may be used or used in combination. The total amount of titanium oxide or carbon black is preferably about 0.1 to 15 parts by weight per 100 parts by weight of silicone rubber.
【0017】また更に本発明に用いられるシリコーンゴ
ムには、充填剤や難燃剤等の配合の増加に伴う押出加工
性の低下を避けるために、必要に応じてシリコーンオイ
ルなどを添加することができる。かかる加工助剤として
のシリコーンオイルの配合量は特に限定されないが、通
常使用される範囲として、シリコーンゴム100重量部
当たり1〜20重量部程度である。Further, silicone oil or the like can be added to the silicone rubber used in the present invention, if necessary, in order to avoid a decrease in extrusion processability due to an increase in the amount of fillers and flame retardants. . The amount of the silicone oil used as the processing aid is not particularly limited, but is generally in the range of about 1 to 20 parts by weight per 100 parts by weight of the silicone rubber.
【0018】上記のようなシリコーンゴムを基材とした
ゴム組成物は、単線又は撚線からなる線状導体上に押出
被覆されたのち、加熱装置に導かれて硬化され、耐火ゴ
ム層となるが、本発明においてはかかる耐火ゴム層の上
に、更に耐火補強層が積層して形成されることにより、
初めて優れた性能を有する耐火層が得られる。The above-described rubber composition based on silicone rubber is extrusion-coated on a linear conductor composed of a single wire or a stranded wire, and then guided to a heating device to be cured to form a fire-resistant rubber layer. However, in the present invention, by further forming a fire-resistant reinforcing layer on the fire-resistant rubber layer,
For the first time, a refractory layer with excellent performance is obtained.
【0019】本発明の耐火電線に用いられる耐火補強層
は、マイカを耐火材料とした集成マイカシートからなる
テープを巻き付けることにより形成されるが、かかるテ
ープは、例えばレーヨンやアセテート等の人造繊維、例
えばポリエステル繊維、ポリアミド繊維、ポリオレフィ
ン繊維等の合成繊維、例えばガラス繊維等の無機繊維な
どで形成された織布又は不織布、或いは例えばポリエチ
レン、ポリエステル等のフィルムなどの補強基材上に、
例えば径が0.2mm以下のフレーク状マイカを層状に接
着し、また必要に応じて上記のような補強基材で挟持し
たシートからなるものである。かかる集成マイカシート
は、厚さが0.01〜0.2mm程度であって良好な可撓
性を有し、0.1kg/cm 以上の引張強さを有しているも
のが好ましい。かかるシートからなるテープは、上記の
耐火ゴム層の上に、重ね巻き或いは縦添え等の方法によ
り少なくも1回以上巻き付けることにより、耐火補強層
が形成される。The fire-resistant reinforcing layer used in the fire-resistant electric wire of the present invention is formed by winding a tape composed of a mica sheet made of mica as a fire-resistant material. Such a tape is made of, for example, artificial fibers such as rayon and acetate. For example, polyester fibers, polyamide fibers, synthetic fibers such as polyolefin fibers, woven or non-woven fabric formed of inorganic fibers such as glass fibers, or, for example, polyethylene, on a reinforcing substrate such as a film of polyester,
For example, it is made of a sheet in which flake-like mica having a diameter of 0.2 mm or less is adhered in a layered form and, if necessary, sandwiched by the above-mentioned reinforcing base material. The laminated mica sheet preferably has a thickness of about 0.01 to 0.2 mm, has good flexibility, and has a tensile strength of 0.1 kg / cm or more. The tape made of such a sheet is wrapped at least once or more on the above-mentioned fire-resistant rubber layer by a method such as lap winding or longitudinal attachment to form a fire-resistant reinforcing layer.
【0020】このような耐火ゴム層と耐火補強層とを導
体上に積層して設けることにより得られた耐火線芯は、
必要に応じて複数本を集束して多芯とするか、又は単芯
のままで絶縁層を被覆する。この絶縁層は、従来技術を
利用して絶縁性の合成樹脂組成物を押出被覆することに
よって形成されるが、かかる合成樹脂組成物としては、
例えばポリエチレン、ポリプロピレンなどのオレフィン
系樹脂組成物が好ましく用いられる。このような絶縁層
で被覆したのち、更に必要に応じて複数本を集束して多
芯とするか、又は単芯のまま、或いは複数本を並列させ
て、その上に保護用のシースなどを押出被覆することに
より、本発明の耐火電線が得られる。The fire-resistant core obtained by laminating such a fire-resistant rubber layer and the fire-resistant reinforcing layer on a conductor is as follows:
If necessary, a plurality of fibers are bundled into a multi-core structure, or the insulating layer is covered with a single core. This insulating layer is formed by extrusion-coating an insulating synthetic resin composition using a conventional technique.
For example, olefin resin compositions such as polyethylene and polypropylene are preferably used. After covering with such an insulating layer, if necessary, a plurality of fibers are bundled into a multi-core, or a single-core, or a plurality of the fibers are arranged in parallel, and a protective sheath or the like is placed thereon. By extrusion coating, the fire-resistant electric wire of the present invention is obtained.
【0021】[0021]
【実施例】シリコーンゴム(SR)として東芝シリコー
ン社製TSF−201(メチルビニルシリコーン)、加
硫剤(CA)として東芝シリコーン社製TC−20B、
白金系触媒(CAT)として東芝シリコーン社製TC−
20A、無機充填剤として表1に示すような粒度の異な
る粉末マイカ(M)、タルク(TC)及びシリカ(SI
L)、難燃剤としてホウ酸亜鉛(ZB)、三酸化アンチ
モン(STO)、水酸化マグネシウム(MHO)及び水
酸化アルミニウム(AHO)、更に難燃助剤として酸化
チタン(TO)及びカーボンブラック(CB)を、表
2、表3の配合に従って配合し且つ混練して、それぞれ
耐火ゴム層用のシリコーンゴム組成物を用意した。EXAMPLES TSF-201 (methyl vinyl silicone) manufactured by Toshiba Silicone Co., Ltd. as silicone rubber (SR), TC-20B manufactured by Toshiba Silicone Co., Ltd. as vulcanizing agent (CA),
TC- made by Toshiba Silicone Co., Ltd. as a platinum-based catalyst (CAT)
20A, powdered mica (M), talc (TC) and silica (SI
L), zinc borate (ZB), antimony trioxide (STO), magnesium hydroxide (MHO) and aluminum hydroxide (AHO) as flame retardants, and titanium oxide (TO) and carbon black (CB) as flame retardants. ) Was kneaded and kneaded in accordance with the formulations shown in Tables 2 and 3 to prepare silicone rubber compositions for a fire-resistant rubber layer.
【0022】[0022]
【表1】 M−1:日本マイカ、キララ、粒度40μm、粒径5〜
45μm M−2:日本マイカ、キララ、粒度52μm、粒径10
〜60μm M−3:日本マイカ、キララ、粒度500μm、粒径1
50〜1130μm TC :フジタルク、MLS100、粒度1.9μm、
粒径0.6〜8μm SIL:日本アエロジル、R972、粒度16nm[Table 1] M-1: Japanese mica, Kirara, particle size 40 µm, particle size 5
45 μm M-2: Japanese mica, Kirara, particle size 52 μm, particle size 10
6060 μm M-3: Japanese mica, Kirara, particle size 500 μm, particle size 1
50-1130 μm TC: Fujitalc, MLS100, particle size 1.9 μm,
SIL: Nippon Aerosil, R972, particle size 16 nm
【0023】[0023]
【表2】 [Table 2]
【0024】[0024]
【表3】 [Table 3]
【0025】一方、断面積2mm2 の撚線銅導体(径1.
8mm)に対して、押出装置により上記の各シリコーンゴ
ム組成物をそれぞれ押出温度60℃で被覆し、更に20
0℃の管状加硫装置を通過させて径2.6mmの線心を得
た。次にこれらの線心に厚さ0.1mmの集成マイカシー
トからなるテープを厚さが約0.2mmとなるように縦添
えし、ガラス繊維で巻いた後、これにポリエチレン絶縁
層を押出被覆して径4.5mmの絶縁電線とした。そのの
ち、更にポリエチレンシースを押出被覆して、それぞれ
外径が12.5mmの耐火電線を得た。また比較のため
に、集成マイカシートの耐火補強層を設けない電線も製
造した。On the other hand, a stranded copper conductor having a cross-sectional area of 2 mm 2 (diameter 1.
8 mm), each of the above silicone rubber compositions was coated at an extrusion temperature of 60 ° C. by an extruder, and further coated for 20 minutes.
After passing through a 0 ° C. tubular vulcanizer, a wire core having a diameter of 2.6 mm was obtained. Next, a tape composed of a mica sheet having a thickness of 0.1 mm is vertically applied to these cores so that the thickness becomes about 0.2 mm, and after being wound with glass fiber, a polyethylene insulating layer is extrusion-coated thereon. Thus, an insulated wire having a diameter of 4.5 mm was obtained. Thereafter, a polyethylene sheath was further extrusion-coated to obtain a fire-resistant electric wire having an outer diameter of 12.5 mm. For comparison, an electric wire without a fireproof reinforcing layer of the mica sheet was also manufactured.
【0026】こうして得たそれぞれの耐火電線からシー
ス及び絶縁被覆を除去した線心の試料について、外観検
査及び可撓性試験を行った。また耐火電線から切り出し
た試料について、常温での絶縁特性及び常温での耐電圧
特性と、30分で840℃に加熱したときの絶縁特性及
び耐電圧特性、続いて1時間で925℃まで加熱したと
きの絶縁特性及び耐電圧特性の試験を行い、これらの試
験結果を纏めて、表2、表3に併せて示した。なお、こ
れらの試験方法及び判定基準は、以下のとおりである。An appearance inspection and a flexibility test were performed on a core sample from which the sheath and the insulating coating had been removed from each of the refractory wires thus obtained. In addition, the sample cut out from the fire-resistant electric wire was heated at a normal temperature and a withstand voltage characteristic at a normal temperature, heated at 840 ° C. for 30 minutes, and then heated to 925 ° C. for 1 hour. Insulation characteristics and withstand voltage characteristics at the time were tested, and the test results were put together and shown in Tables 2 and 3. In addition, these test methods and criteria are as follows.
【0027】(1) 外観検査 線心試料の耐火層の表面を目視で調べ、凹凸がなく、均
一であるものを○、そうでないものを×とした。 (2) 可撓性 線心試料を径10mmのマンドレルに巻き付け、ひび割れ
が生じないものを○、そうでないものを×とした。(1) Appearance Inspection The surface of the refractory layer of the wire core sample was visually inspected. (2) Flexibility The core sample was wound around a mandrel having a diameter of 10 mm.
【0028】(3) 常温絶縁性 加熱炉に出入できる台車に垂直に取り付けた、縦300
mm、横300mm、厚さ10mmのパーライト板に対して、
長さ1.3mの耐火電線試料をその中央部の20cmを隔
てた2箇所の位置で、それぞれ径1.6mmの軟銅線を用
いて水平に取り付けて固定した。そして、その取り付け
位置の中央に約13mmの間隔を置いて、長さ40cmの径
1.6mmの軟銅線2本の束の両端を巻き付け、その軟銅
線の中央部に長さ1.3mの耐火電線の重量の2倍に相
当する荷重をかけた。そして、線心導体と固定線との間
に500Vの直流電圧を印加して常温での絶縁抵抗値を
測定し、50MΩ以上の抵抗値を有するものを○、そう
でないものを×とした。(3) Room temperature insulation A vertical 300 mounted vertically on a carriage that can enter and exit the heating furnace.
mm, 300mm wide and 10mm thick pearlite plate,
A refractory electric wire sample having a length of 1.3 m was horizontally attached and fixed using soft copper wires each having a diameter of 1.6 mm at two positions 20 cm apart from each other at the center. At both ends of a bundle of two 40 cm long soft copper wires having a diameter of 1.6 mm are wound around the center of the mounting position at an interval of about 13 mm, and a 1.3 m long fireproof wire is wound around the center of the soft copper wire. A load equivalent to twice the weight of the electric wire was applied. Then, a DC voltage of 500 V was applied between the wire core conductor and the fixed wire, and the insulation resistance at room temperature was measured.
【0029】(4) 常温耐電圧性 前記の常温絶縁性測定に続いて、線心導体と固定線との
間に1500Vの商用交流電圧を印加し、1分間で絶縁
破壊が起こらないものを○、そうでないものを×とし
た。(4) Room Temperature Withstand Voltage Following the above-mentioned room temperature insulation measurement, a commercial AC voltage of 1500 V was applied between the core conductor and the fixed wire, and the one that did not cause dielectric breakdown in one minute was evaluated as ○. , And those that were not were marked as x.
【0030】(5) 840℃絶縁性 前記の常温耐電圧性測定を行ったのち、耐火電線の試料
を取り付けた台車を加熱炉内に導入し、600Vの商用
交流電圧をかけ続けながら、加熱炉を30分間で840
℃まで昇温させた。この状態で導体と固定線との間に5
00Vの直流電圧を印加して絶縁抵抗値を測定し、0.
4MΩ以上の抵抗値を有するものを○、そうでないもの
を×とした。(5) Insulation at 840 ° C. After the above-mentioned normal temperature withstand voltage measurement, the bogie on which the sample of the refractory wire was mounted was introduced into the heating furnace, and while the commercial AC voltage of 600 V was continuously applied, the heating furnace was heated. 840 in 30 minutes
The temperature was raised to ° C. In this state, 5
A DC voltage of 00 V was applied to measure the insulation resistance.
Those having a resistance value of 4 MΩ or more were evaluated as ○, and those having no resistance were evaluated as ×.
【0031】(6) 840℃耐電圧性 前記の840℃絶縁性測定に続いて、導体と固定線との
間に1500Vの商用交流電圧を印加し、1分間で絶縁
破壊が起こらないものを○、そうでないものを×とし
た。(6) 840 ° C. Withstand Voltage Following the above-mentioned 840 ° C. insulation measurement, a commercial AC voltage of 1500 V was applied between the conductor and the fixed wire. , And those that were not were marked as x.
【0032】(7) 925℃絶縁性 前記の840℃耐電圧性測定を行ったのち、加熱炉内で
更に30分間600Vの商用交流電圧をかけ続けながら
加熱して、合計1時間で925℃まで昇温させた。この
状態で導体と固定線との間に500Vの直流電圧を印加
して絶縁抵抗値を測定し、0.4MΩ以上の抵抗値を有
するものを○、そうでないものを×とした。(7) Insulation at 925 ° C. After the above-mentioned 840 ° C. withstand voltage measurement, the sample was heated in a heating furnace while continuing to apply a commercial AC voltage of 600 V for another 30 minutes to reach 925 ° C. in one hour. The temperature was raised. In this state, a DC voltage of 500 V was applied between the conductor and the fixed wire, and the insulation resistance was measured.
【0033】(8) 925℃耐電圧性 前記の925℃絶縁性測定に続いて、導体と固定線との
間に1500Vの商用交流電圧を印加し、1分間で絶縁
破壊が起こらないものを○、そうでないものを×とし
た。(8) 925 ° C. Withstand Voltage Following the above-mentioned 925 ° C. insulation measurement, a commercial AC voltage of 1500 V was applied between the conductor and the fixed wire. , And those that were not were marked as x.
【0034】表2に示した試験結果を見ると、シリコー
ンゴム100重量部当たりで、粉末マイカ、特に粒度が
50μm以上の粉末マイカを200重量部まで配合する
と共に、難燃剤としてホウ酸亜鉛と難燃助剤として酸化
チタン又はカーボンブラックを配合したゴム組成物を、
加硫剤と白金系触媒を併用し架橋してなる耐火ゴム層
と、マイカシートからなる耐火補強層とを重ねて設けた
耐火電線は、従来から耐火材料として用いられていたよ
うな、通常の無機質充填剤を配合したシリコーンゴム組
成物からなるゴム層と、耐火補強層とからなる耐火層を
有する耐火電線は勿論のこと、難燃助剤の添加を省略し
た耐火電線と比較して、特に925℃での耐電圧性が改
良されていることがわかる。According to the test results shown in Table 2, powder mica, especially powder mica having a particle size of 50 μm or more, was compounded up to 200 parts by weight per 100 parts by weight of silicone rubber, and zinc borate was used as a flame retardant. A rubber composition containing titanium oxide or carbon black as a combustion aid,
A fire-resistant electric wire provided by stacking a fire-resistant rubber layer formed by cross-linking a vulcanizing agent and a platinum-based catalyst together with a fire-resistant reinforcing layer made of a mica sheet, such as those conventionally used as a fire-resistant material, A rubber layer comprising a silicone rubber composition containing an inorganic filler, and a fire-resistant wire having a fire-resistant layer consisting of a fire-resistant reinforcing layer, as well as a fire-resistant wire omitting the addition of a flame-retardant aid, It can be seen that the withstand voltage at 925 ° C. is improved.
【0035】[0035]
【発明の効果】本発明の耐火電線は、耐火性の無機充填
剤として粉末マイカと、難燃剤としてホウ酸亜鉛と、難
燃助剤として酸化チタン又はカーボンブラックとを配合
すると共に、加硫剤と白金系触媒を併用したシリコーン
ゴム組成物からなる耐火ゴム層を設け、更にマイカシー
トからなる耐火補強層を組み合わせて設けた構成を備え
たもので、撚線導体を用いた芯線であっても、消防庁告
示第7号の耐火認定基準に適合する耐火特性は勿論、9
25℃での絶縁特性と耐電圧特性とも併せ備えているう
え、生産効率が大幅に改善される効果がある。The fire-resistant electric wire of the present invention comprises powdered mica as a fire-resistant inorganic filler, zinc borate as a flame retardant, titanium oxide or carbon black as a flame retardant, and a vulcanizing agent. And a fireproof rubber layer made of a silicone rubber composition using a platinum-based catalyst in combination with a fireproof reinforcing layer made of a mica sheet. The fire resistance characteristics conforming to the fire protection standards of the Fire Service Notification No. 7
In addition to having both the insulation characteristics at 25 ° C. and the withstand voltage characteristics, there is an effect that the production efficiency is greatly improved.
【図1】本発明に係る耐火電線の構造を示す断面図であ
る。FIG. 1 is a cross-sectional view showing a structure of a fireproof electric wire according to the present invention.
【図2】従来技術に係る耐火電線の構造を示す断面図で
ある。FIG. 2 is a cross-sectional view showing a structure of a fire-resistant electric wire according to the related art.
1 耐火電線 2 導体 3 耐火層 3a 耐火ゴム層 3b 耐火補強層 4 絶縁層 5 シース DESCRIPTION OF SYMBOLS 1 Fireproof electric wire 2 Conductor 3 Fireproof layer 3a Fireproof rubber layer 3b Fireproof reinforcement layer 4 Insulation layer 5 Sheath
Claims (5)
ンブラックの少なくとも一方とホウ酸亜鉛と粉末マイカ
とを配合したゴム組成物を過酸化物系加硫剤と白金系触
媒とで架橋してなる耐火ゴム層と、集成マイカシートか
らなる耐火補強層とを、線状導体の周囲に順次に設けた
耐火線芯に対して、更に絶縁層とシースとを順次に被覆
してなることを特徴とする耐火電線。1. A refractory rubber obtained by crosslinking a rubber composition obtained by blending at least one of titanium oxide or carbon black, zinc borate and powdered mica with a silicone rubber with a peroxide-based vulcanizing agent and a platinum-based catalyst. A fireproof reinforcing layer comprising a mica sheet and a fireproof wire core provided sequentially around the linear conductor, further comprising an insulating layer and a sheath sequentially coated thereon. Electrical wire.
リコーンゴム100重量部に対して15重量部以下配合
されてなる、請求項1に記載の耐火電線。2. The fire-resistant wire according to claim 1, wherein titanium oxide or carbon black is blended in an amount of 15 parts by weight or less based on 100 parts by weight of the silicone rubber.
量部に対して15重量部以下配合されてなる、請求項1
又は2に記載の耐火電線。3. The composition according to claim 1, wherein zinc borate is blended in an amount of 15 parts by weight or less based on 100 parts by weight of the silicone rubber.
Or the refractory wire according to 2.
カである、請求項1乃至3のいずれかに記載の耐火電
線。4. The fire-resistant electric wire according to claim 1, wherein the powder mica is a powder mica having a diameter of 50 μm or more.
量部に対して250重量部以下配合されてなる、請求項
1乃至4のいずれかに記載の耐火電線。5. The refractory electric wire according to claim 1, wherein the powder mica is blended in an amount of 250 parts by weight or less based on 100 parts by weight of the silicone rubber.
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JP01279598A JP3528143B2 (en) | 1998-01-26 | 1998-01-26 | Fire resistant wire |
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JPH11213771A true JPH11213771A (en) | 1999-08-06 |
JP3528143B2 JP3528143B2 (en) | 2004-05-17 |
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ID=11815342
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