JP2000011772A - Fire-resistant electric cable - Google Patents
Fire-resistant electric cableInfo
- Publication number
- JP2000011772A JP2000011772A JP10180877A JP18087798A JP2000011772A JP 2000011772 A JP2000011772 A JP 2000011772A JP 10180877 A JP10180877 A JP 10180877A JP 18087798 A JP18087798 A JP 18087798A JP 2000011772 A JP2000011772 A JP 2000011772A
- Authority
- JP
- Japan
- Prior art keywords
- fire
- resistant
- silicone rubber
- refractory
- weight
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
Landscapes
- Insulated Conductors (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., the wire may short-circuit 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1に示すような構造を有するものがある(例えば
特公昭63−11721号など)。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。A refractory wire used for such a purpose has a structure as shown in FIG. 1 (for example, Japanese Patent Publication No. 63-11721). 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 refractory layer 3 of the refractory 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 about 0.01 to 0.2 mm. And the like.
【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 fire-resistant electric wires have a fire resistance certification standard specified by the Fire and Disaster Management Agency Notification No. 7 (the insulation resistance immediately after heating to 840 ° C for 30 minutes is 0.4 MΩ or more, the insulation 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 the 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 a high temperature of 840 ° C. or higher, which are 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、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する問題がある。そこで、
シリコーンポリマーに白金系架橋剤とセラミック化剤と
を配合したコンパウンドを導体に被覆した耐火層を設け
た耐火電線が提案されている(特開平9−237527
号)。しかしこのような耐火層は、静的な燃焼試験の下
では耐火性能があるものの、燃焼後のセラミック層の強
度が不足するため崩壊し易く、実用上十分な耐火性能を
示さない場合があった。However, when a highly flexible stranded wire conductor is used for applications requiring workability, not only the thickness of the refractory layer becomes non-uniform but also the smoothness of the surface is lost. There is a problem that the withstand voltage characteristic of the electric wire is reduced. Therefore,
There has been proposed a fire-resistant wire provided with a fire-resistant layer in which a conductor is coated with a compound of a silicone polymer mixed with a platinum-based crosslinking agent and a ceramic agent (Japanese Patent Application Laid-Open No. 9-237527).
issue). However, such a refractory layer has fire resistance performance under a static combustion test, but tends to collapse due to insufficient strength of the ceramic layer after combustion, and may not show sufficient fire resistance performance for practical use. .
【0008】そこで本発明者は、特定の性状を有する粉
末マイカを充填した架橋シリコーンゴムからなる耐火ゴ
ム層の上に、集成マイカシートからなる耐火テープを巻
き付けたマイカテープ層を重ねて設けた、2層構造の耐
火層を有する耐火電線を発明し、特許出願している(特
願平9−200052号)。しかしながら、これらの改
良技術でも、耐火テープの巻き付け工程は、耐火電線の
製造工程を複雑とするほか、耐火電線の施工性の点でも
問題が残っている。Accordingly, the present inventor has provided a mica tape layer in which a fire-resistant tape made of a laminated mica sheet is wound on a fire-resistant rubber layer made of a crosslinked silicone rubber filled with powdered mica having a specific property. A refractory wire having a two-layered refractory layer has been invented and a patent application has been filed (Japanese Patent Application No. 9-200052). However, even with these improved techniques, the step of winding the fire-resistant tape complicates the manufacturing process of the fire-resistant wire, and also has problems in the workability of the fire-resistant wire.
【0009】[0009]
【発明が解決しようとする課題】本発明は、上記の問題
を解決するためになされたもので、耐火テープの巻き付
けを行わなくても、撚線導体を用いても単線導体を用い
た場合と同様に、優れた耐火絶縁特性と耐電圧特性とを
保持し得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 has been made in order to solve the above-mentioned problems, and it is not necessary to wrap a fire-resistant tape, to use a stranded conductor or a single-wire conductor. Similarly, another object of the present invention is to provide a fire-resistant electric wire capable of maintaining excellent fire-resistant insulation characteristics and withstand voltage characteristics.
【0010】[0010]
【課題を解決するための手段】上記の本発明の目的は、
線状導体上に、水酸化アルミニウム粉末とマイカ粉末と
を少なくとも配合した架橋シリコーンゴムからなる耐火
層を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。また、かかる本発明の耐火
電線において、耐火層を構成する架橋シリコーンゴム中
の水酸化アルミニウム粉末の配合量は、シリコーンゴム
100重量部に対して3〜100重量部であることが好
ましく、これにより耐火層が高熱に曝されたときの耐火
絶縁特性と耐電圧特性が改良される。SUMMARY OF THE INVENTION The object of the present invention is as follows.
On a linear conductor, a refractory wire core provided with a refractory layer made of a crosslinked silicone rubber containing at least an aluminum hydroxide powder and a mica powder, the insulating layer and the sheath are sequentially coated. This can be achieved by the featured refractory wire. In the fire-resistant electric wire of the present invention, the amount of the aluminum hydroxide powder in the crosslinked silicone rubber constituting the fire-resistant layer is preferably 3 to 100 parts by weight with respect to 100 parts by weight of the silicone rubber. The refractory insulation and withstand voltage characteristics when the refractory layer is exposed to high heat are improved.
【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、水酸化アルミニウム粉末とマイ
カ粉末とを少なくとも配合した架橋シリコーンゴムから
なっている。そして、かかる耐火層3の上にポリエチレ
ンからなる絶縁層4で被覆され、更にその外周にシース
5が被覆してあるものである。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. It is made of a crosslinked silicone rubber containing at least a powder. The refractory layer 3 is covered with an insulating layer 4 made of polyethylene, and the outer periphery thereof is further covered with a sheath 5.
【0012】本発明の耐火電線において、耐火層を形成
する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 refractory wire of the present invention, the silicone rubber used for forming the refractory layer is preferably HTV.
A so-called millable type silicone rubber such as that described above can be used, but the material is not limited to this as long as it can cover the linear conductor with a desired thickness. 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架橋剤
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や、
白金系の架橋触媒などが挙げられるが、かかる架橋剤
は、それぞれ使用するシリコーンゴムの種類と所望の架
橋条件に応じて適宜選択することができる。また白金系
触媒は、前記の架橋剤と併用すると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%の範囲であることが好ましい。Examples of the crosslinking agent blended in the silicone rubber include organic peroxides such as dicumyl peroxide, dibenzoyl peroxide, di-2,4, dichlorobenzoyl peroxide, and t-butyl perbenzoate. Things and
Platinum-based cross-linking catalysts and the like can be mentioned, and such cross-linking agents can be appropriately selected according to the type of silicone rubber used and desired cross-linking conditions. When a platinum-based catalyst is used in combination with the above-mentioned cross-linking agent, it has a remarkable effect on improving the fire resistance of the electric wire. However, any platinum-catalyst that is generally used for cross-linking silicone rubber can be used. The amounts of these vulcanizing agents and platinum-based catalysts can be appropriately determined. Usually, the amount of the vulcanizing agent is in the range of 1 to 3% by weight, and the amount of the platinum-based catalyst is 0.1 to 10% by weight based on silicone rubber.
Preferably it is in the range of 0.5% by weight.
【0014】本発明の耐火電線の耐火層を形成するに用
いられるシリコーンゴムには、耐熱性の無機充填剤が配
合される。かかる無機充填剤としては、珪酸質の充填剤
などのうち、特にマイカ粉末が好ましく、中でも粒度
(平均粒径)が50μm以上のマイカ粉末が特に好まし
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。
かかるマイカ粉末の配合量は、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。マイカ粉末の配合量が1
0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。The silicone rubber used to form the refractory layer of the refractory wire of the present invention contains a heat-resistant inorganic filler. As such an inorganic filler, among silicic fillers and the like, mica powder is particularly preferable, and mica powder having a particle size (average particle size) of 50 μm or more is particularly 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 the mica powder to be blended is desirably 250 parts by weight or less, preferably 10 to 200 parts by weight, per 100 parts by weight of the silicone rubber. The amount of mica powder is 1
When the amount is less than 0 parts by weight, the effect of improving the fire resistance is not large, and when the amount is more than 250 parts by weight, the withstand voltage characteristics are impaired.
【0015】上記のようなマイカ粉末を充填したシリコ
ーンゴムには、シリコーンゴムが燃焼分解して生成する
セラミック質耐火層の強さを改善するために、改質剤と
しての水酸化アルミニウム粉末が配合される。かかる水
酸化アルミニウム粉末は、粒度(平均粒径)が0.5〜
100μm程度のものが好ましく、その配合量は、少な
過ぎるときは効果が十分でなく、また多過ぎるときは、
シリコーンゴムを導体上に被覆するときの加工性が低下
するので、シリコーンゴム100重量部当たり5〜10
0重量部の範囲であることが適当である。In order to improve the strength of the ceramic refractory layer formed by burning and decomposing the silicone rubber, aluminum hydroxide powder as a modifier is blended with the silicone rubber filled with mica powder as described above. Is done. Such aluminum hydroxide powder has a particle size (average particle size) of 0.5 to
It is preferably about 100 μm, and the compounding amount is insufficient when the amount is too small, and when the amount is too large,
Since the processability when coating the silicone rubber on the conductor is reduced, 5 to 10 parts by weight per 100 parts by weight of the silicone rubber are used.
Suitably, it is in the range of 0 parts by weight.
【0016】また、本発明に用いられるシリコーンゴム
には、充填剤や改質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3〜35重量部程度である。配合量がこれより少な
いときは耐火層の平滑さが失われ、また25重量部を超
えると高温時の電気特性が不安定となる傾向があるの
で、いずれも好ましくない。The silicone rubber used in the present invention may be added with a silicone oil or the like, if necessary, in order to avoid a decrease in extrusion processability due to an increase in the amount of fillers and modifiers. it can. The amount of the silicone oil used as the processing aid is not particularly limited, but is generally used in the range of about 3 to 35 parts by weight per 100 parts by weight of the silicone rubber. When the amount is less than the above range, the smoothness of the refractory layer is lost, and when the amount exceeds 25 parts by weight, electric characteristics at high temperatures tend to be unstable.
【0017】更に本発明に用いられるシリコーンゴムに
は、混練加工性を改善するために、シリコーン油に加え
てステアリン酸を添加することができる。かかるステア
リン酸の配合量は、シリコーンゴム100重量部当たり
0.1〜25重量部であるのがよい。配合量がこれより
少ないと混練加工性を改善することができず、また25
重量部を超えても混練加工性は改善されないうえ、耐火
層の平滑さが失われるので好ましくない。Further, in order to improve the kneading processability, stearic acid can be added to the silicone rubber used in the present invention in addition to the silicone oil. The amount of such stearic acid is preferably 0.1 to 25 parts by weight per 100 parts by weight of silicone rubber. If the amount is less than this, kneading processability cannot be improved, and 25
Exceeding the parts by weight does not improve the kneading processability and also loses the smoothness of the refractory layer, which is not preferred.
【0018】このような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ことができる。かか
る難燃剤としては特に限定されないが、燃焼時にハロゲ
ン化合物を発生しないものが好ましく、例えば水酸化マ
グネシウム等の金属水酸化物の粉末、ホウ酸亜鉛等のホ
ウ酸化合物などが好ましく用いられる。かかる難燃剤の
配合量は、シリコーン重合体100重量部当たり0.1
〜10重量部程度であることが好ましい。A flame retardant can be added to such a silicone rubber in order to further enhance fire resistance. The flame retardant is not particularly limited, but preferably does not generate a halogen compound during combustion. For example, a powder of a metal hydroxide such as magnesium hydroxide or the like, or a boric acid compound such as zinc borate is preferably used. The amount of the flame retardant is 0.1% by weight per 100 parts by weight of the silicone polymer.
It is preferably about 10 to 10 parts by weight.
【0019】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、シリコーンゴム組成
物に用いた架橋系に対応した架橋条件下で硬化されて、
耐火線芯が得られる。The rubber composition based on the silicone rubber as described above is extrusion-coated on a linear conductor composed of a single wire or a stranded wire, and then guided to a heating device to form a crosslinked system used for the silicone rubber composition. Cured under the crosslinking conditions corresponding to
A fire-resistant core is obtained.
【0020】かかる耐火線芯は、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された耐火素線
は、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。Such a refractory core may be bundled into a plurality of cores as required, or may be covered with an insulating layer while keeping a single core. This insulating layer is formed by extrusion-coating an insulating synthetic resin composition using a conventional technique.
As such a synthetic resin composition, for example, polyethylene,
An olefin-based resin composition such as polypropylene is preferably used. The refractory wire covered with such an insulating layer may be further bundled as necessary to form a multi-core,
Alternatively, the fire-resistant electric wire of the present invention can be obtained by keeping a single core or by arranging a plurality of them in parallel and extruding and coating a protective sheath or the like thereon.
【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XE21−B5881(メチルビニルシリコー
ン)、架橋剤(CA)として東芝シリコーン社製TC−
8、加工助剤としてシリコーンオイル(SO)及びステ
アリン酸(SA)、無機充填剤として表1に示すような
粒度の異なるマイカ粉末(M)、改質剤として同じく表
1に示すような粒度の異なる水酸化アルミニウム(AH
O)、改質剤の対照物として炭酸マグネシウム(MC)
及び水酸化マグネシウムを、表2の配合に従って配合し
且つ混練して、それぞれ耐火層用のシリコーンゴム組成
物を用意した。EXAMPLES XE21-B5881 (methyl vinyl silicone) manufactured by Toshiba Silicone Co., Ltd. as silicone rubber (SR), and TC- manufactured by Toshiba Silicone Co., Ltd. as cross-linking agent (CA).
8. Silicone oil (SO) and stearic acid (SA) as processing aids, mica powders (M) having different particle sizes as shown in Table 1 as inorganic fillers, and mica powders with different particle sizes as shown in Table 1 as modifiers Different aluminum hydroxides (AH
O), magnesium carbonate (MC) as a control for the modifier
And magnesium hydroxide were blended and kneaded according to the blending in Table 2 to prepare a silicone rubber composition for a fire-resistant 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 AHO−1:昭和電工、ハイジライトH−10 AHO−2:昭和電工、ハイジライトH−40[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 AHO-1: Showa Denko, Heidilite H-10 AHO-2: Showa Denko, Heidilite H-40
【0023】[0023]
【表2】 [Table 2]
【0024】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、それぞれ径2.6mm
の耐火線芯を得た。これらの耐火線心にポリエチレン絶
縁層を押出被覆して径4.5mmの絶縁電線とした。その
後、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、改質剤の水酸化アルミニウムを配合しないシリコー
ンゴム組成物を被覆した径2.6mmの線芯に、集成マイ
カシートの耐火補強層を巻き付けて径3.0mmの耐火線
芯を得、これにポリエチレン絶縁層を被覆して径4.5
mmの絶縁電線とした後、更にポリエチレンシースを押出
被覆した、外径が12.5mmの従来技術による耐火電線
も製造した。On the other hand, a stranded copper conductor having a cross section 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 vulcanizing device, each has a diameter of 2.6 mm.
Was obtained. These fire-resistant cores were extrusion-coated with a polyethylene insulating layer to form insulated wires having a diameter of 4.5 mm. Thereafter, a polyethylene sheath was further extrusion-coated to obtain fire-resistant electric wires each having an outer diameter of 12.5 mm. Further, for comparison, a refractory reinforcing layer of a mica sheet was wound around a 2.6 mm diameter core coated with a silicone rubber composition not containing aluminum hydroxide as a modifier to form a 3.0 mm diameter refractory core. And coated with a polyethylene insulating layer to obtain a diameter of 4.5.
After forming an insulated wire having a diameter of 1 mm, a refractory wire according to the prior art having an outer diameter of 12.5 mm, which was further coated with a polyethylene sheath by extrusion, was also manufactured.
【0025】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耐火線芯の試料について、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
性及び耐電圧特性の試験を行い、これらの試験結果を纏
めて、表2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 sample of the refractory core obtained by removing the sheath and the insulating coating from each of the refractory wires thus obtained. In addition, the samples cut out from the refractory wire were tested for insulation properties at room temperature and withstand voltage properties at room temperature, and insulation properties and withstand voltage properties when heated to 840 ° C in 30 minutes, and the test results were summarized. Table 2 also shows the results. In addition, these test methods and criteria are as follows.
【0026】(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.
【0027】(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.
【0028】(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 property 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.
【0029】(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) 840 ° C. Insulation After performing 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 ×.
【0030】(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.
【0031】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、マイカ粉末、特に粒度が
50μm以上のマイカ粉末を200重量部まで配合する
と共に、改質剤として水酸化アルミニウムを5〜100
重量部の範囲で配合したゴム組成物を被覆し、架橋して
なる耐火層を設けた耐火電線は、マイカシートからなる
耐火補強層を設けなくても、優れた耐火性能を有してい
ることがわかる。According to the test results shown in Table 2, mica powder, especially mica powder 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 aluminum hydroxide was used as a modifier. 5-100
A fire-resistant electric wire coated with a rubber composition compounded in a range of parts by weight and provided with a fire-resistant layer formed by cross-linking has excellent fire resistance performance without providing a fire-resistant reinforcing layer made of mica sheet. I understand.
【0032】[0032]
【発明の効果】本発明の耐火電線は、耐火性の無機充填
剤としてマイカ粉末と、改質剤として水酸化アルミニウ
ムとを少なくとも配合した、架橋シリコーンゴムからな
る耐火層を設けたもので、マイカシートからなる耐火補
強層を設けなくても、消防庁告示第7号の耐火認定基準
に適合する耐火特性を備えているうえ、生産効率が大幅
に改善される効果がある。The fire-resistant electric wire according to the present invention is provided with a fire-resistant layer comprising a crosslinked silicone rubber containing at least mica powder as a fire-resistant inorganic filler and aluminum hydroxide as a modifier. Even if the fire-resistant reinforcing layer made of a sheet is not provided, the fire-proof characteristics conforming to the fire resistance certification standard of the Fire Service Agency Notification No. 7 are provided, and the production efficiency is greatly improved.
【図1】従来の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 conventional fire-resistant electric wire.
1 耐火電線 2 導体 3 耐火層 4 絶縁層 5 シース DESCRIPTION OF SYMBOLS 1 Fireproof electric wire 2 Conductor 3 Fireproof layer 4 Insulating layer 5 Sheath
Claims (5)
とマイカ粉末とを少なくとも配合した架橋シリコーンゴ
ムからなる耐火層を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。An insulating layer and a sheath are sequentially coated on a refractory wire core having a refractory layer made of a crosslinked silicone rubber in which at least aluminum hydroxide powder and mica powder are blended on a linear conductor. A fire-resistant electric wire characterized by being made.
ゴム100重量部に対して3〜100重量部配合されて
なる、請求項1に記載の耐火電線。2. The fire-resistant electric wire according to claim 1, wherein the aluminum hydroxide powder is mixed in an amount of 3 to 100 parts by weight based on 100 parts by weight of the silicone rubber.
するものである、請求項1乃至2のいずれかに記載の耐
火電線。3. The refractory wire according to claim 1, wherein the mica powder has a particle size 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3のいずれかに記載の耐火電線。4. The fire-resistant wire according to claim 1, wherein the mica powder is blended in an amount of 250 parts by weight or less based on 100 parts by weight of the silicone rubber.
ステアリン酸が配合されてなる、請求項1乃至4のいず
れかに記載の耐火電線。5. The refractory wire according to claim 1, wherein silicone oil or stearic acid is blended as a processing aid.
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JP18087798A JP3555101B2 (en) | 1998-06-26 | 1998-06-26 | Fire resistant wire |
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JP18087798A JP3555101B2 (en) | 1998-06-26 | 1998-06-26 | Fire resistant wire |
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