JPH03203123A - Fire-resistant electric wire-cable - Google Patents

Fire-resistant electric wire-cable

Info

Publication number
JPH03203123A
JPH03203123A JP1340283A JP34028389A JPH03203123A JP H03203123 A JPH03203123 A JP H03203123A JP 1340283 A JP1340283 A JP 1340283A JP 34028389 A JP34028389 A JP 34028389A JP H03203123 A JPH03203123 A JP H03203123A
Authority
JP
Japan
Prior art keywords
cable
pts
flame
halogen
intermediate layer
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.)
Pending
Application number
JP1340283A
Other languages
Japanese (ja)
Inventor
Akihiro Hori
掘 彰弘
Norio Takahata
紀雄 高畑
Masami Tanmachi
正美 反町
Yasuaki Yamamoto
康彰 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Cable Ltd
Original Assignee
Hitachi Cable Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Priority to JP1340283A priority Critical patent/JPH03203123A/en
Publication of JPH03203123A publication Critical patent/JPH03203123A/en
Pending legal-status Critical Current

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  • Compositions Of Macromolecular Compounds (AREA)
  • Organic Insulating Materials (AREA)
  • Insulated Conductors (AREA)

Abstract

PURPOSE:To obtain electric wires and cables with high fire resistance and processibility by adding dimethylsiloxane which works as a fire retarding agent and as a lubricating agent to an intermediate layer. CONSTITUTION:A cable is prepared using halogen-free materials for all of the insulated wires, an intermediate layer, and a sheath. An insulator formed on the outside of the conductive wire is coated with an intermediate layer consisting of polyolefin, metal hydroxide, and hydroxy-terminated dimethylsiloxane having melt viscosity 1X10<5>-5X10<9> c-poise at 23 deg.C in a ratio of 100 pts.wt., 100-500 pts.wt., and 1-50 pts.wt., respectively. Further, a halogen- free flame retarding sheath layer consisting of polyolefin and metal hydroxide in a ratio of 100 pts.wt. and 50-250 pts.wt., respectively is formed on the intermediate layer. In this way, a flame-resistant insulated cable having good mechanical property, extrusion processibility, and high flame retarding property is obtained and the cable does not generate harmful halogen-based gases.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、難燃性絶縁電線・ケーブルに係わり、特に
燃焼時に有毒なハロゲン系ガスを発生しない絶縁電線・
ケーブルに関する。
[Detailed Description of the Invention] [Industrial Application Field] This invention relates to flame-retardant insulated wires and cables, and particularly to insulated wires and cables that do not generate toxic halogen gas when burned.
Regarding cables.

[従来の技術〕 電線・ケーブルの絶縁材料やシース材料としては電気絶
縁性に優れたポリオレフィンが数多く用いられてきてい
る。最近の趨勢として原子力発電所用電線・ケーブル、
車両用電線・ケーブル、船舶用電線・ケーブルに垂直ト
レイ燃焼試験レベルの高度の難燃性が要望されるように
なってきた。
[Prior Art] Many polyolefins with excellent electrical insulation properties have been used as insulation materials and sheath materials for electric wires and cables. Recent trends include electric wires and cables for nuclear power plants,
There is a growing demand for electric wires and cables for vehicles and ships to have a high level of flame retardancy that matches the level of vertical tray combustion tests.

ポリオレフィンを難燃化する方法としては、ハロゲン含
有化合物を混和する方法が一般に採用されてきている。
As a method of making polyolefin flame retardant, a method of incorporating a halogen-containing compound has generally been adopted.

しかし、これらは燃焼時多量の煙を発生し、機器への腐
食性1人体への有害性等が問題になっている。特に、最
近は安全面からこの様なハロゲン系ガスを発生しないこ
とが要望されるようになってきている。
However, these produce a large amount of smoke when burned, causing problems such as corrosiveness to equipment and toxicity to the human body. In particular, recently there has been a demand for not generating such halogen-based gases from the standpoint of safety.

このような情勢を踏まえ、発煙性、有毒性の非常に少な
い金属水酸化物が注目されるようになってきた。
In light of this situation, metal hydroxides, which are extremely low in smoke generation and toxicity, are attracting attention.

[発明が解決しようとする課題] ところが、金属水酸化物は難燃効果が小さいため高度の
難燃性を付与するには金属水酸化物を多量に加える必要
があり、その結果、機械特性、押出加工性が著しく低下
するという問題がある。
[Problems to be Solved by the Invention] However, since metal hydroxides have a small flame retardant effect, it is necessary to add a large amount of metal hydroxides to provide a high degree of flame retardancy, and as a result, mechanical properties, There is a problem that extrusion processability is significantly reduced.

この発明は、上記の状況に鑑みてなされものであり、絶
縁体およびシース材料の物性を損なわずに高度の難燃性
をもち、しかも難燃時に有毒なハロゲン系ガスを発生し
ない難燃性電線・ケーブルを提供することを目的とする
This invention was made in view of the above situation, and provides a flame-retardant electric wire that has a high degree of flame retardancy without impairing the physical properties of the insulator and sheath material, and does not generate toxic halogen gas when flame-retardant.・The purpose is to provide cables.

[課題を解決するための手段] この発明の離燃性電線・ケーブルは、導体の外側に絶縁
体であるポリオレフィン100重量部に対して金属水酸
化物100〜500重量部と溶融粘度(温度23℃にお
ける)が1×10″′〜5×10’センチボイズで末端
が水酸基であるジメチルシロキサンl−50重量部を添
加してなる介在層を設け、さらにその外側にポリオレフ
ィン100重量部に対して金属水酸化物50〜250重
量部を加えてなるハロゲンを含まない難燃性シース層を
被覆することにより前記目的を達成している。
[Means for Solving the Problems] The flame retardant electric wire/cable of the present invention includes 100 to 500 parts by weight of a metal hydroxide and a melt viscosity (temperature 23 An intervening layer is formed by adding 50 parts by weight of dimethylsiloxane having a diameter of 1 x 10"' to 5 x 10' centivoise (at 100°C) and a hydroxyl group at the end, and a layer of metal is added to the outer side of the layer. The above object is achieved by coating with a halogen-free flame retardant sheath layer containing 50 to 250 parts by weight of hydroxide.

[実 施 例1 ここで、ポリオレフィンに対する金属水酸化物の含有量
が多い程難燃性は向上するが、これに伴い機械特性、押
出加工性は低下する。この発明では、介在層に難燃助剤
、滑剤として作用するジメチルシロキサンを加えること
により、良好な!im性、加工性を得るものである。こ
のような観点から、介在層における金属水酸化物の含有
量は50〜250重量部とする必要があり、その下限値
未満では目的とする難燃性を付与できず、また、上限値
を越えると押出加工性が著しく低下し、成形不能となっ
てしまう。
[Example 1 Here, the flame retardance improves as the content of metal hydroxide in the polyolefin increases, but mechanical properties and extrusion processability deteriorate accordingly. In this invention, by adding dimethylsiloxane, which acts as a flame retardant aid and a lubricant, to the intervening layer, a good! It provides imitability and processability. From this point of view, the content of metal hydroxide in the intervening layer needs to be 50 to 250 parts by weight; if it is less than the lower limit, the desired flame retardance cannot be imparted, and if it exceeds the upper limit. Extrusion processability deteriorates significantly and molding becomes impossible.

また、ジメチルシロキサンは、溶融粘度(23℃の温度
における)が1×10B〜5X10’センチボイズのも
のを1〜50重量部添加する必要があり、溶融粘度がそ
の下限値未満では押出加工性が悪くなり、また、上限値
を越えるど難燃性が劣ってしまう。さらに、添加量がそ
の下限値未満では難燃性、押出加工性が劣るようになり
、また、上限値を越えると組成物の粘度が著しく低下し
てしまい加工成形しずらくなる。
In addition, it is necessary to add 1 to 50 parts by weight of dimethylsiloxane with a melt viscosity (at a temperature of 23°C) of 1 x 10 B to 5 x 10' centivoise, and if the melt viscosity is less than the lower limit, extrusion processability will be poor. Moreover, if the upper limit is exceeded, the flame retardance will be inferior. Furthermore, if the amount added is less than the lower limit, the flame retardance and extrusion processability will be poor, and if it exceeds the upper limit, the viscosity of the composition will drop significantly, making it difficult to process and mold.

さらに、シース層における金属水酸化物の含有量は50
〜250重量部とする必要があり、その下限値未満では
目的とするH燃性を付与できず、また、その上限値を越
えると機械特性、押出加工性が悪くなる。
Furthermore, the content of metal hydroxide in the sheath layer is 50
It is necessary to set the amount to 250 parts by weight; if it is less than the lower limit, the desired H flammability cannot be imparted, and if it exceeds the upper limit, the mechanical properties and extrusion processability will deteriorate.

ポリオレフィンとしては、エチレンプロピレンコポリマ
ー、エチレンブロビレンジエンターボリマー、ポリエチ
レン、エチレン酢酸ビニルコポリマー エチレンエチル
アクリレートコボリマーエチレンブテンコボリマー、エ
チレンメチルメタクリレートコポリマーといったものが
挙げられ、これらは単独または2種以上併用して使用さ
れる。
Examples of polyolefins include ethylene propylene copolymer, ethylene brobylene diene polymer, polyethylene, ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer, ethylene butene copolymer, and ethylene methyl methacrylate copolymer, which may be used alone or in combination of two or more. used as

金属水酸化物としては、水酸化アルミニウム水酸化マグ
ネシウム、塩基性炭酸マグネシウム。
Examples of metal hydroxides include aluminum hydroxide, magnesium hydroxide, and basic magnesium carbonate.

ハイドロタルサイト類等があり、これらは単独または2
種以上併用して使用してもよい。
There are hydrotalcites, etc., which can be used alone or in combination.
More than one species may be used in combination.

この発明に使用される絶縁体としては、ポリエチレン、
架橋ポリエチレン等一般に使用される絶縁用ポリオレフ
ィンあるいは前記ポリオレフィンに金属水酸化物を適当
量混合したものが使用される。
Insulators used in this invention include polyethylene,
A commonly used insulating polyolefin such as cross-linked polyethylene or a polyolefin mixed with an appropriate amount of metal hydroxide is used.

この発明においては、上記成分に加えて架橋剤、酸化防
止剤、滑剤、軟化剤5分散剤等を適宜添加してもよい。
In this invention, in addition to the above components, a crosslinking agent, an antioxidant, a lubricant, a softener, a dispersant, etc. may be added as appropriate.

酸化防止剤としては、フェニル−α−ナフチルアミン、
N、N’ −ジ−β−ナフチル−p−フェニ1ノンジア
ミン等のアミン系酸化防止剤、2I6−ジーt−ブチル
−4−メチルフェノール、ヒンダードフエノール等のフ
エノル系酸化防止剤が挙げられる。
As antioxidants, phenyl-α-naphthylamine,
Examples include amine antioxidants such as N,N'-di-β-naphthyl-p-phenylone diamine, and phenolic antioxidants such as 2I6-di-t-butyl-4-methylphenol and hindered phenol.

次に、この発明の具体的な実施例を比較例とともに説明
する。
Next, specific examples of the present invention will be described together with comparative examples.

第1表に示す実施例1〜4および比較例1〜8の各配合
成分を、100℃の温度に保持された6インチロールに
投入してロール混線を行ない、混線後120℃の温度に
保持された40m/m押出機(L/D=25)を用い、
外径5.3mmの絶縁線心を3本撚合せた外周に1.0
mmの厚さで介在層を押出被覆し、さらにその上に2.
0mmの厚さでシース層を押出被覆して各試料とした。
The ingredients of Examples 1 to 4 and Comparative Examples 1 to 8 shown in Table 1 were put into a 6-inch roll maintained at a temperature of 100°C, and the rolls were mixed, and after the mixing, the mixture was maintained at a temperature of 120°C. Using a 40 m/m extruder (L/D=25),
1.0 on the outer periphery of three twisted insulated wire cores with an outer diameter of 5.3 mm.
An intervening layer is extrusion coated to a thickness of mm, and 2.
Each sample was coated with a sheath layer by extrusion to a thickness of 0 mm.

機械特性は、日本電綿工業規格第391号に準じJIS
  K7112のダンベル3号で打ち抜いた試料を、シ
ョッパ型引張試験機を用い200mm/分で引張試験を
行ない、引張強さが1.0k g / m m 2以上
、伸びが350%以上を良とし、この個未満を不良とし
た。
Mechanical properties are JIS in accordance with Japan Electric Cotton Industrial Standard No. 391.
A sample punched out with K7112 dumbbell No. 3 was subjected to a tensile test at 200 mm/min using a Schopper type tensile tester, and a tensile strength of 1.0 kg/mm2 or more and an elongation of 350% or more were considered good. Less than this number was considered defective.

難燃性評価は次のようにして行なった。長さ2mのケー
ブルを垂直に8本ならべ、下から70.0OOBTUの
炎を20分間当て、自己消炎すれば合格であり、自己消
炎せず全焼するものは不合格とした。
Flame retardancy evaluation was performed as follows. Eight cables each having a length of 2 m were lined up vertically, and a flame of 70.0 OOBTU was applied from below for 20 minutes, and if the flame self-extinguished, it was passed, and if it did not self-extinguish and burned down, it was rejected.

第1表下欄に各供試組成物の評価結果を合せて示す。The evaluation results for each sample composition are also shown in the lower column of Table 1.

第1表からも明らかなとおり、この発明に係る実施例1
〜4のものは、いずれも難燃性に合格し、機械特性、押
出加工性にも優れたものとなっている。
As is clear from Table 1, Example 1 according to this invention
-4 all passed the flame retardant test and had excellent mechanical properties and extrusion processability.

これに対して、シースの金属酸化物の含有量がこの発明
で規定する規定値以下の比較例1のものは難燃性が不合
格であり、また、規定値以上の比較例2の6のはシース
の押出加工性が悪く成形不可能であった。また、介在層
中の金属酸化物の含有量がこの発明で規定する規定値以
下の比較例3のものでは、難燃性が不合格であり、規定
値以上の比較例4のものでは介在層の押出加工性が悪く
成形不可能であった。
On the other hand, the flame retardance of Comparative Example 1, in which the content of metal oxide in the sheath is less than the specified value stipulated in this invention, is rejected for flame retardancy, and in Comparative Example 2, 6, in which the content of metal oxide in the sheath is equal to or higher than the specified value. The sheath had poor extrusion processability and could not be molded. In addition, in Comparative Example 3 in which the content of metal oxide in the intervening layer was less than the specified value stipulated in this invention, the flame retardance was rejected, and in Comparative Example 4 in which the content of metal oxide in the intervening layer was higher than the specified value, the intervening layer The extrusion processability was poor and molding was impossible.

ジメチルポリシロキサンの溶融粘度(23℃の温度にお
ける)がこの発明で規定する規定値以下の比較例5のも
のでは、加工性が悪く成形不可能であった。また、溶融
粘度(23℃の温度における)がこの発明で規定する規
定値以上の比較例6のものでは難燃性が不合格となった
。さらに、ジメチルポリシロキサンの含有量がこの発明
で規定する規定値以下の比較例7のものではドリップが
生じて難燃性が不合格となり、規定値以上の比較例8の
ちのでは押出加工性が悪く成形不可能であった。
In Comparative Example 5, in which the melt viscosity of dimethylpolysiloxane (at a temperature of 23° C.) was less than the specified value specified in the present invention, processability was poor and molding was impossible. Further, in Comparative Example 6 whose melt viscosity (at a temperature of 23° C.) was equal to or higher than the specified value specified in the present invention, the flame retardance was rejected. Furthermore, in Comparative Example 7, in which the content of dimethylpolysiloxane was less than the specified value stipulated in this invention, dripping occurred and the flame retardance was rejected, while in Comparative Example 8, in which the content of dimethylpolysiloxane was above the specified value, extrusion processability was poor. It was bad and could not be molded.

(以下余白) [発明の効果] この発明によれば、良好な機械特性、押出加工性および
高度の難燃性を有し、しがち有毒なハロゲン系ガスを発
生しない優れた難燃性絶縁電線ケーブルが得られる。
(The following is a blank space) [Effects of the Invention] According to the present invention, an excellent flame-retardant insulated wire has good mechanical properties, extrusion processability, and high flame retardancy, and does not tend to generate toxic halogen gases. You get the cable.

Claims (1)

【特許請求の範囲】 絶縁線心、介在、シース等全てハロゲンフリーの材料で
構成されるケーブルにおいて、 線心導体の外側に被覆される絶縁体が、ポリオレフィン
100重量部に対して金属水酸化物100〜500重量
部と溶融粘度(温度23℃における)が1×10^5〜
5×10^9センチポイズで末端が水酸基であるジメチ
ルシロキサン1〜50重量部を添加してなる介在層を設
け、さらにその外側にポリオレフィン100重量部に対
して金属水酸化物50〜250重量部を加えてなるハロ
ゲンを含まない難燃性シース層を被覆したことを特徴と
する難燃性電線・ケーブル。
[Scope of Claims] In a cable in which the insulated wire core, intervening material, sheath, etc. are all made of halogen-free materials, the insulator coated on the outside of the wire core conductor is made of metal hydroxide based on 100 parts by weight of polyolefin. 100 to 500 parts by weight and a melt viscosity (at a temperature of 23°C) of 1 x 10^5 to
An intervening layer is formed by adding 1 to 50 parts by weight of dimethylsiloxane having a size of 5 x 10^9 centipoise and a hydroxyl group at the end, and furthermore, 50 to 250 parts by weight of a metal hydroxide is added to 100 parts by weight of the polyolefin on the outside. A flame-retardant electric wire/cable characterized by being coated with a flame-retardant sheath layer that does not contain halogen.
JP1340283A 1989-12-29 1989-12-29 Fire-resistant electric wire-cable Pending JPH03203123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1340283A JPH03203123A (en) 1989-12-29 1989-12-29 Fire-resistant electric wire-cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1340283A JPH03203123A (en) 1989-12-29 1989-12-29 Fire-resistant electric wire-cable

Publications (1)

Publication Number Publication Date
JPH03203123A true JPH03203123A (en) 1991-09-04

Family

ID=18335458

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1340283A Pending JPH03203123A (en) 1989-12-29 1989-12-29 Fire-resistant electric wire-cable

Country Status (1)

Country Link
JP (1) JPH03203123A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5708085A (en) * 1996-08-28 1998-01-13 Dow Corning Corporation Low density polyethylene modified with silicone materials
US5708084A (en) * 1996-08-28 1998-01-13 Dow Corning Corporation Organic polymers modified with silicone materials
US5789473A (en) * 1995-01-17 1998-08-04 Dow Corning Corporation Polyolefin composition containing diorganopolysiloxane process aid
US6013217A (en) * 1997-12-22 2000-01-11 Dow Corning Corporation Method for extruding thermoplastic resins
WO2000040651A1 (en) * 1998-12-28 2000-07-13 Fujikura Ltd. Halogen-free flame-retardant resin composition
JP2010084103A (en) * 2008-10-02 2010-04-15 Kurabe Ind Co Ltd Flame-retardant composition and electric wire
WO2015051581A1 (en) * 2013-10-12 2015-04-16 长园集团股份有限公司 Insulating material for nuclear grade electric cables

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5789473A (en) * 1995-01-17 1998-08-04 Dow Corning Corporation Polyolefin composition containing diorganopolysiloxane process aid
US5708085A (en) * 1996-08-28 1998-01-13 Dow Corning Corporation Low density polyethylene modified with silicone materials
US5708084A (en) * 1996-08-28 1998-01-13 Dow Corning Corporation Organic polymers modified with silicone materials
US6013217A (en) * 1997-12-22 2000-01-11 Dow Corning Corporation Method for extruding thermoplastic resins
WO2000040651A1 (en) * 1998-12-28 2000-07-13 Fujikura Ltd. Halogen-free flame-retardant resin composition
JP2010084103A (en) * 2008-10-02 2010-04-15 Kurabe Ind Co Ltd Flame-retardant composition and electric wire
WO2015051581A1 (en) * 2013-10-12 2015-04-16 长园集团股份有限公司 Insulating material for nuclear grade electric cables

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