JP2009019190A - Non-halogen flame-retardant resin composition and non-halogen flame-retardant electric wire or cable - Google Patents

Non-halogen flame-retardant resin composition and non-halogen flame-retardant electric wire or cable Download PDF

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JP2009019190A
JP2009019190A JP2008114157A JP2008114157A JP2009019190A JP 2009019190 A JP2009019190 A JP 2009019190A JP 2008114157 A JP2008114157 A JP 2008114157A JP 2008114157 A JP2008114157 A JP 2008114157A JP 2009019190 A JP2009019190 A JP 2009019190A
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resin composition
cable
flame retardant
halogen flame
weight
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JP5659450B2 (en
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Kazufumi Kimura
一史 木村
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Hitachi Cable Ltd
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Hitachi Cable Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-halogen flame-retardant electric wire or cable superior in flame retardancy, mechanical strength and elongation, and without using a red phosphorus and halogen-based flame retardant. <P>SOLUTION: A cable sheath 4 for covering an insulator layer 2 and/or an insulated wire 11 for covering a conductor 1, is formed of a resin composition formed by mixing silane-processed magnesium hydroxide by 100-250 pts.wt. with 100 pts.wt. of a polymer composed of 50-80 pts.wt. of an ethylene-vinyl acetate copolymer, 10-30 pts.wt. of polypropylene and 10-20 pts.wt. of a maleic acid-modified ethylene copolymer of modifying of a copolymer of copolymerizing ethylene and a comonomer of an α olefin having the carbon number of 3-8 by maleic anhydride. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ノンハロゲン難燃樹脂組成物及びノンハロゲン難燃電線・ケーブルに係り、特に、難燃性に優れ、かつ環境に配慮したノンハロゲン難燃電線・ケーブルに関する。   The present invention relates to a halogen-free flame retardant resin composition and a halogen-free flame retardant electric wire / cable, and more particularly to a halogen-free flame retardant electric wire / cable excellent in flame retardancy and environmentally friendly.

近年、ポリ塩化ビニルやハロゲン系難燃剤を使用しない環境負荷の小さなノンハロゲン難燃電線・ケーブルが、いわゆるエコ電線・ケーブルとして急速に普及している。従来のノンハロゲン難燃電線・ケーブルでは、電線の絶縁体やケーブルのシースとして、ポリオレフィンに水酸化マグネシウムをはじめとするノンハロゲン難燃剤を混和した樹脂組成物が用いられているのが一般的である。   In recent years, non-halogen flame retardant wires and cables that do not use polyvinyl chloride or halogen-based flame retardants and have a low environmental impact are rapidly spreading as so-called eco wires and cables. In conventional non-halogen flame retardant electric wires / cables, a resin composition in which a non-halogen flame retardant such as magnesium hydroxide is mixed with polyolefin is generally used as an electric wire insulator or cable sheath.

特開２００３−１６０７０４号公報JP 2003-160704 A 特開平１０−２８７７７７号公報JP-A-10-287777

しかしながら、水酸化マグネシウムをはじめとするノンハロゲン難燃剤を使用して電線・ケーブルを難燃化するためには、多量のノンハロゲン難燃剤を混和する必要がある。このため、電線の絶縁体やケーブルシースの機械的特性や伸びが大幅に低下する問題がある。   However, in order to make a wire or cable flame retardant using a non-halogen flame retardant such as magnesium hydroxide, it is necessary to mix a large amount of the non-halogen flame retardant. For this reason, there exists a problem in which the mechanical characteristic and elongation of the insulator of an electric wire and a cable sheath fall significantly.

一方、赤リンなどの難燃助剤を加え、ノンハロゲン難燃剤を減量する方法もあるが、赤リンは燃焼時に有害なホスフィンを発生したり、廃却時にはリン酸を生成し地下水脈を汚染する懸念が指摘されることから、最近では赤リンの使用は控える傾向にある。   On the other hand, there are methods to reduce the amount of non-halogen flame retardants by adding a flame retardant aid such as red phosphorus. Due to concerns, red phosphorus has recently been refrained from being used.

そこで、本発明の目的は、上記課題を解決し、難燃性、機械的強度かつ伸びに優れ、赤リン及びハロゲン系難燃剤を使用しないノンハロゲン難燃電線・ケーブルを提供することにある。   Accordingly, an object of the present invention is to provide a non-halogen flame-retardant electric wire / cable that solves the above-described problems and is excellent in flame retardancy, mechanical strength and elongation, and does not use red phosphorus and halogen-based flame retardants.

上記目的を達成するために、請求項１の発明は、エチレン・酢酸ビニル共重合体５０〜８０重量部と、ポリプロピレン１０〜３０重量部と、エチレンと炭素数が３〜８のαオレフィンのコモノマーを共重合させた共重合ポリマを無水マレイン酸で変性したマレイン酸変性エチレン共重合体１０〜２０重量部とからなるポリマー１００重量部に対し、シラン処理水酸化マグネシウムを１００〜２５０重量部混和してなることを特徴とするノンハロゲン難燃樹脂組成物である。   In order to achieve the above-mentioned object, the invention of claim 1 includes an ethylene / vinyl acetate copolymer 50 to 80 parts by weight, polypropylene 10 to 30 parts by weight, ethylene and an α-olefin comonomer having 3 to 8 carbon atoms. 100-250 parts by weight of silanized magnesium hydroxide is mixed with 100 parts by weight of a polymer comprising 10-20 parts by weight of a maleic acid-modified ethylene copolymer obtained by modifying a copolymer polymer obtained by copolymerization with maleic anhydride. A non-halogen flame retardant resin composition.

請求項２の発明は、上記樹脂組成物をＵＩＣ（国際車輌連合）規格に基づき速度３００〜５００ｍｍ／ｍｉｎで引張ったときの伸び率が２００％以上である。   The invention according to claim 2 has an elongation percentage of 200% or more when the resin composition is pulled at a speed of 300 to 500 mm / min based on the UIC (International Vehicle Union) standard.

請求項３の発明は、上記請求項１又は２に記載の樹脂組成物により、導体を被覆する絶縁体層を形成したことを特徴とするノンハロゲン難燃電線である。   A third aspect of the present invention is a non-halogen flame retardant electric wire characterized in that an insulating layer covering a conductor is formed from the resin composition according to the first or second aspect.

請求項４の発明は、上記請求項１又は２に記載の樹脂組成物により、絶縁電線を被覆するケーブルシースを形成したことを特徴とするノンハロゲン難燃ケーブルである。   The invention of claim 4 is a non-halogen flame retardant cable characterized in that a cable sheath for covering an insulated wire is formed from the resin composition of claim 1 or 2.

本発明によれば、高難燃性を有し、かつ架橋処理をしなくても機械的特性に優れた環境に優しいノンハロゲン難燃樹脂組成物及びノンハロゲン電線・ケーブルを得ることができる。   According to the present invention, it is possible to obtain an environmentally friendly non-halogen flame retardant resin composition and a non-halogen electric wire / cable that have high flame retardancy and are excellent in mechanical properties without being subjected to crosslinking treatment.

以下、本発明の好適な一実施形態を添付図面に基づいて詳述する。   Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

図１は本発明に係るノンハロゲン難燃電線・ケーブルの好適な実施の形態を示した断面図である。   FIG. 1 is a cross-sectional view showing a preferred embodiment of a non-halogen flame retardant electric wire / cable according to the present invention.

図１に示すように、本実施の形態のノンハロゲン難燃ケーブル（以下、難燃ケーブル）１０は、２本並列のノンハロゲン難燃電線（以下、難燃電線）１１を介在３と共に対撚りして構成されるコアの外周に、ノンハロゲン難燃樹脂組成物からなるケーブルシース（シース）４を被覆したものである。   As shown in FIG. 1, the non-halogen flame retardant cable (hereinafter referred to as flame retardant cable) 10 of the present embodiment is formed by twisting two non-halogen flame retardant cables (hereinafter referred to as flame retardant cables) 11 in parallel with the interposition 3. A cable sheath (sheath) 4 made of a non-halogen flame retardant resin composition is coated on the outer periphery of the core.

本実施の形態の難燃電線１１は、導体１の外周に、ノンハロゲン難燃樹脂組成物からなる絶縁体（層）２を被覆したものである。   In the flame-retardant electric wire 11 of the present embodiment, the outer periphery of the conductor 1 is coated with an insulator (layer) 2 made of a non-halogen flame-retardant resin composition.

導体１はＣｕ或いはＣｕ合金、介在３はポリプロピレンで構成される。   The conductor 1 is made of Cu or Cu alloy, and the interposition 3 is made of polypropylene.

絶縁体２及びシース４を構成する樹脂組成物は、エチレン・酢酸ビニル共重合体（以下、ＥＶＡ）とポリプロピレン（以下、ＰＰ）のブレンドポリマーにマレイン酸変性エチレン共重合体（以下、Ｍ−ＰＯ）を加え、難燃剤としてシラン処理水酸化マグネシウムを混和したものである。   The resin composition constituting the insulator 2 and the sheath 4 is a blended polymer of ethylene / vinyl acetate copolymer (hereinafter EVA) and polypropylene (hereinafter PP) to maleic acid-modified ethylene copolymer (hereinafter M-PO). ) And silane-treated magnesium hydroxide as a flame retardant.

各材料の配合割合は、ＥＶＡ５０〜８０重量部と、ＰＰ１０〜３０重量部と、Ｍ−ＰＯ１０〜２０重量部とからなるポリマー１００重量部に対し、シラン処理水酸化マグネシウムが１００〜２５０重量部である。   The blending ratio of each material is 100 to 250 parts by weight of silanized magnesium hydroxide with respect to 100 parts by weight of polymer composed of EVA 50 to 80 parts by weight, PP 10 to 30 parts by weight, and M-PO 10 to 20 parts by weight. is there.

ＰＰとしては、アイソタクチックＰＰまたはシンジオタクチックＰＰが挙げられ、ホモＰＰ、ブロックＰＰ、エチレン系の共重合成分を含むランダムＰＰのいずれでもよい。   Examples of PP include isotactic PP and syndiotactic PP, which may be homo PP, block PP, or random PP containing an ethylene copolymer component.

ＥＶＡを５０〜８０重量部、ＰＰを１０〜３０重量部の割合とした理由は、ＥＶＡが５０重量部未満では難燃性が低く、８０重量部を超えるとＰＰの割合が少なくなり、機械的特性（特に耐加熱変形性）が著しく低下するからである。より好ましくは、ＥＶＡを５０〜６０重量部、ＰＰを２０〜３０重量部とする。   The reason why EVA is 50 to 80 parts by weight and PP is 10 to 30 parts by weight is that when EVA is less than 50 parts by weight, the flame retardancy is low, and when it exceeds 80 parts by weight, the ratio of PP decreases and mechanical This is because the characteristics (particularly heat deformation resistance) are significantly lowered. More preferably, EVA is 50 to 60 parts by weight and PP is 20 to 30 parts by weight.

Ｍ−ＰＯは、ブレンドポリマー（ＥＶＡとＰＰ）とシラン処理水酸化マグネシウムとの界面を密着させて強度を向上させる機能を持つ。Ｍ−ＰＯはエチレン・プロピレンコポリマ或いはエチレン・ブテンコポリマなど、エチレンと炭素数が３〜８のα−オレフィンのコモノマーを共重合させた共重合ポリマを無水マレイン酸で変性したものであるのが好ましい。Ｍ−ＰＯは、従来の難燃電線・ケーブルに用いられていたポリエチレン、ポリプロピレン、エチレンエチルアクリレートコポリマ、エチレン・酢酸ビニルコポリマのマレイン酸変性タイプに比べて、ＥＶＡ／ＰＰアロイの相溶化剤としての機能に優れ、かつＭ−ＰＯ自身の結晶量が少ないため、難燃剤の高充填系（難燃剤を多量に混和した樹脂組成物）における伸びの低下が少ない。Ｍ−ＰＯを１０〜２０重量部に規定した理由は、Ｍ−ＰＯが１０重量部未満の場合、ポリオレフィンと金属水酸化物との密着が弱く、十分な機械的強度が得られず、Ｍ−ＰＯが２０重量部を超えると絶縁体２又はシース４の伸びが大幅に低下するからである。   M-PO has a function of improving the strength by bringing the interface between the blend polymer (EVA and PP) and the silane-treated magnesium hydroxide into close contact. M-PO is preferably a copolymer obtained by copolymerizing ethylene and an α-olefin comonomer having 3 to 8 carbon atoms with maleic anhydride, such as ethylene / propylene copolymer or ethylene / butene copolymer. M-PO is a compatibilizer for EVA / PP alloy compared to the maleic acid-modified type of polyethylene, polypropylene, ethylene ethyl acrylate copolymer and ethylene / vinyl acetate copolymer used in conventional flame retardant wires and cables. Since the function is excellent and the amount of crystals of M-PO itself is small, there is little decrease in elongation in a highly filled system of a flame retardant (a resin composition containing a large amount of flame retardant). The reason why the M-PO is defined as 10 to 20 parts by weight is that when the M-PO is less than 10 parts by weight, the adhesion between the polyolefin and the metal hydroxide is weak, and sufficient mechanical strength cannot be obtained. This is because when the PO exceeds 20 parts by weight, the elongation of the insulator 2 or the sheath 4 is significantly reduced.

シラン処理水酸化マグネシウムの表面処理に用いるシランカップリング剤としては、ビニルトリエトキシシラン、メタクリルシラン、アミノシラン等が挙げられ、これらを周知の手法により表面処理して使用する。シラン処理水酸化マグネシウムの混和量を１００〜２５０重量部に規定した理由は、１００重量部未満の場合、難燃性が不十分であり、２５０重量部を超えると、機械的特性（特に伸び）が大幅に低下するからである。また、シラン処理水酸化マグネシウムに、ステアリン酸などの脂肪酸処理水酸化マグネシウムを適宜加えても差し支えない。   Examples of the silane coupling agent used for the surface treatment of the silane-treated magnesium hydroxide include vinyltriethoxysilane, methacryl silane, and aminosilane, and these are used after being surface-treated by a well-known method. The reason why the amount of the silane-treated magnesium hydroxide is defined as 100 to 250 parts by weight is that the flame retardance is insufficient when the amount is less than 100 parts by weight, and the mechanical properties (especially elongation) when the amount exceeds 250 parts by weight. This is because of a significant drop. Further, fatty acid-treated magnesium hydroxide such as stearic acid may be appropriately added to silane-treated magnesium hydroxide.

これらの割合で配合した難燃樹脂組成物で形成された絶縁体２またはシース４は、ＵＩＣ（国際車輌連合）規格に基づき速度３００〜５００ｍｍ／ｍｉｎで引張したとき、その伸び率が２００％以上である。   The insulator 2 or sheath 4 formed of the flame retardant resin composition blended at these ratios has an elongation of 200% or more when pulled at a speed of 300 to 500 mm / min based on the UIC (International Vehicle Union) standard. It is.

上記伸び率は以下の方法により求めることができる。
絶縁体又はシースをダンベル状に切り抜き、ダンベル状試験片の中央部（幅５ｍｍ、長さ２０ｍｍ以上）に一定の長さの標線を付け（標線間隔＝Ｌ0）、これを引張試験機で引張り、破断時の標線間距離をＬ1とし、伸び率Ｅ0を下記式により求める。
Ｅ0＝｛(Ｌ1−Ｌ0)／Ｌ0｝×１００ The elongation percentage can be determined by the following method.
An insulator or sheath is cut out in a dumbbell shape, and a fixed length of reference line is attached to the central part (width 5 mm, length 20 mm or more) of the dumbbell test piece (mark interval = L 0 ). The distance between the marked lines at the time of breaking is set to L 1 , and the elongation percentage E 0 is obtained by the following formula.
E 0 = {(L 1 −L 0 ) / L 0 } × 100

本実施の形態の難燃電線・ケーブルの作用効果を説明する。   The effect of the flame-retardant electric wire / cable of this embodiment will be described.

本実施の形態の難燃電線１１は、ＥＶＡとＰＰのブレンドポリマーにＭ−ＰＯを加えることにより、ＥＶＡとＰＰの相溶性を向上させ、絶縁体２及びシース４に、難燃性を高くすべく多量の難燃剤を混和しても伸びが良好である。特にＵＩＣ（国際車輌連合）規格の速度３００ｍｍ／ｍｉｎでの引張試験においても十分な特性を有するものである。   The flame retardant electric wire 11 of this embodiment improves the compatibility of EVA and PP by adding M-PO to a blend polymer of EVA and PP, and makes the insulator 2 and the sheath 4 highly flame retardant. Even if a flame retardant as much as possible is mixed, the elongation is good. In particular, it has sufficient characteristics even in a tensile test at a speed of 300 mm / min according to the UIC (International Vehicle Union) standard.

また、絶縁体２は高融点のＰＰを効果的に分散させることにより、架橋しなくても耐加熱変形性が良好である。   Moreover, the insulator 2 has good heat deformation resistance even when it is not crosslinked by effectively dispersing PP having a high melting point.

難燃電線１１は定格温度１０５℃までは非架橋で使用することができる（機械的強度を保持し得る）が、用途に応じて電子線や紫外線等の放射線を照射したり、有機過酸化物を用いて周知の方法で架橋処理して用いてもかまわない。   The flame retardant wire 11 can be used in a non-crosslinked state up to a rated temperature of 105 ° C. (it can retain mechanical strength), but it can be irradiated with radiation such as an electron beam or ultraviolet rays or an organic peroxide depending on the application And may be used after being crosslinked by a known method.

また、本実施の形態の難燃ケーブル１０は、難燃電線１１の絶縁体２と同じ樹脂組成物でシース４を形成しているので、難燃ケーブル１０も難燃電線１１と同様の作用効果を有する。   Moreover, since the flame retardant cable 10 of this Embodiment forms the sheath 4 with the same resin composition as the insulator 2 of the flame retardant electric wire 11, the flame retardant cable 10 also has the same effect as the flame retardant electric wire 11. Have

本発明においては、上記の成分に加えて架橋助剤、難燃助剤、酸化防止剤、滑剤、安定剤、充填剤、着色剤、シリコーン等を添加してもよい。   In the present invention, in addition to the above components, a crosslinking aid, a flame retardant aid, an antioxidant, a lubricant, a stabilizer, a filler, a colorant, silicone, and the like may be added.

図１の難燃ケーブル１０は、絶縁体２とシース４の両方を上記の樹脂組成物で構成したものであるが、本発明に係る難燃ケーブル１０は、シース４のみを上記の樹脂組成物で構成してもよい。   Although the flame-retardant cable 10 of FIG. 1 comprises both the insulator 2 and the sheath 4 with the above resin composition, the flame-retardant cable 10 according to the present invention includes only the sheath 4 with the above resin composition. You may comprise.

絶縁体２及びシース４を構成する難燃性組成物は円形の電線・ケーブルの他に、例えば平形ケーブルや、エスカレータのバンドレール、難燃フィルムにも適用可能である。   The flame retardant composition constituting the insulator 2 and the sheath 4 can be applied to, for example, flat cables, escalator band rails, and flame retardant films in addition to circular electric wires and cables.

次に、本発明の実施の形態について、実施例に基づいて説明するが、本発明の実施の形態はこれらの実施例に限定されるものではない。   Next, embodiments of the present invention will be described based on examples, but the embodiments of the present invention are not limited to these examples.

（実施例（電線）１〜３）
１．試料の作製
実施例及び比較例共に表１に記載した成分を１８０〜２００℃に保持した３リットルニーダに投入して混練し、混練後１８０℃に保持した４０ｍｍ押出機（長径比Ｌ／Ｄ＝２４）を用いて、２ＳＱの銅撚り線上に厚さ１ｍｍで押出被覆して難燃電線を作製した。
（実施例（ケーブル）１〜６）
ケーブルは、難燃電線をポリプロピレン介在と共に対撚りしたコアの上に、１８０℃に保持した４０ｍｍ押出機（長径比Ｌ／Ｄ＝２４）を用いて表１に示すノンハロゲン樹脂組成物をシース（厚さ約１ｍｍ）として押出し、ケーブル（図１）を作製した。
（比較例（ケーブル）１〜６）
表２に示した配合の樹脂組成物を用いて、実施例（ケーブル）１〜６と同様にしてケーブルを作製した。 (Example (electric wire) 1-3)
1. Preparation of Sample In both Examples and Comparative Examples, the components described in Table 1 were put into a 3 liter kneader maintained at 180 to 200 ° C. and kneaded. After kneading, a 40 mm extruder (long diameter ratio L / D = 24), a flame-retardant electric wire was produced by extrusion coating with a thickness of 1 mm on a 2SQ copper stranded wire.
(Example (cable) 1-6)
The cable is a sheath (thickness) of a non-halogen resin composition shown in Table 1 using a 40 mm extruder (major diameter ratio L / D = 24) maintained at 180 ° C. on a core in which a flame-retardant electric wire is twisted together with polypropylene interposed. And a cable (FIG. 1) was produced.
(Comparative example (cable) 1-6)
Using the resin composition having the composition shown in Table 2, cables were produced in the same manner as in Examples (Cables) 1-6.

各電線・ケーブルの評価方法は以下のようにして行った。
（１）引張特性
電線については、導体を抜き取って得られたチューブをＪＩＳ Ｃ３００５に準拠して引張試験を行った。ケーブルについては、シースを剥ぎ取り、これをダンベル３号に切り抜き、ＪＩＳ Ｋ６２５１に準拠して引張試験を行った。引張速度はいずれも３００ｍｍ／ｍｉｎ（ＵＩＣ Ｃｏｄｅ８９７参考）とした。引張強さと伸び率の目標は、それぞれ１２ＭＰａ≦、２５０％≦とした。
（２）耐加熱変形性
耐加熱変形性は、ＵＩＣ Ｃｏｄｅ８９７に準拠して評価した。電線については、導体を抜き取らずそのまま用いた。ケーブルについては、長さ４０ｍｍ、幅はケーブル円周の約１／３となるように調整した。これらの試料を１００℃に保持した恒温層内で１６時間予熱し、その後所定の荷重を掛けて１００℃×４時間試験した。変形量の目標は５０％以下とした。荷重の計算は下式による。
Ｆ（Ｎ）＝０．８√（２Ｄｅ−ｅ２）
ｅ：シースまたは絶縁体の厚さ（ｍｍ），Ｄ：ケーブルの平均外径（ｍｍ）
（３）難燃性
電線及びケーブルをＵＩＣ Ｃｏｄｅ８９７に準拠して、垂直（傾斜角９０°）における難燃性を評価した。評価の基準は、約６０秒着火後、３０秒以内に消化したものを合格、３０秒を超えて燃焼するものを不合格とした。 The evaluation method of each electric wire and cable was performed as follows.
(1) Tensile property About the electric wire, the tensile test was done for the tube obtained by extracting the conductor based on JISC3005. About the cable, the sheath was peeled off, this was cut out into dumbbell No. 3, and the tensile test was done based on JISK6251. The tensile speed was 300 mm / min (see UIC Code 897). The targets for tensile strength and elongation were set to 12 MPa ≦ and 250% ≦, respectively.
(2) Heat deformation resistance Heat deformation resistance was evaluated based on UIC Code 897. For the electric wire, the conductor was used without being pulled out. The cable was adjusted to have a length of 40 mm and a width of about 1/3 of the cable circumference. These samples were preheated for 16 hours in a thermostatic layer maintained at 100 ° C., and then tested at 100 ° C. for 4 hours under a predetermined load. The target for the amount of deformation was 50% or less. The load is calculated according to the following formula.
F (N) = 0.8√ (2De−e 2 )
e: thickness of sheath or insulator (mm), D: average outer diameter of cable (mm)
(3) Flame retardance The flame retardancy in the vertical direction (inclination angle 90 °) was evaluated based on UIC Code 897 for electric wires and cables. The criteria for evaluation were that after digestion for about 60 seconds, those digested within 30 seconds passed, and those that burned for more than 30 seconds were rejected.

Figure 2009019190
Figure 2009019190

Figure 2009019190
Figure 2009019190

表１に示したように、難燃電線の実施例１〜３及び難燃ケーブルの実施例１〜６はいずれも引張特性、伸び、耐加熱変形性及び難燃性のいずれの項目においても優れていることが分かる。   As shown in Table 1, Examples 1 to 3 of the flame retardant wire and Examples 1 to 6 of the flame retardant cable are all excellent in any of tensile properties, elongation, heat deformation resistance, and flame resistance. I understand that

一方、ＥＶＡが規定量より少なくＰＰが多い比較例１は、難燃性が不合格となり、反対にＥＶＡが規定量を超えてＰＰが少ない比較例２は引張強さと耐加熱変形性が目標を下回った。   On the other hand, Comparative Example 1 in which EVA is less than the specified amount and PP is large fails in flame retardancy, and on the contrary, Comparative Example 2 in which EVA exceeds the specified amount and PP is low has the targets for tensile strength and heat deformation resistance. Below.

Ｍ−ＰＯ及び難燃剤が規定量未満である比較例３は、引張強さや耐加熱変形性が低く、かつ難燃性が不合格となった。Ｍ−ＰＯが規定量を超える比較例４は、伸びが低下していた。本発明以外のマレイン酸変性ポリマを使用した比較例５は伸びが劣った。また、難燃剤が規定範囲を超える比較例６は引張強さ及び伸びが目標を満足しなかった。   In Comparative Example 3 in which M-PO and the flame retardant are less than the specified amounts, the tensile strength and the heat deformation resistance are low, and the flame retardancy is rejected. In Comparative Example 4 where M-PO exceeded the specified amount, the elongation was reduced. Comparative Example 5 using a maleic acid-modified polymer other than the present invention was inferior in elongation. Further, in Comparative Example 6 in which the flame retardant exceeded the specified range, the tensile strength and elongation did not satisfy the targets.

本発明に係る好適な一実施形態の難燃ケーブル（難燃電線を含む）を示す断面図である。It is sectional drawing which shows the flame-retardant cable (a flame-retardant electric wire is included) of suitable one Embodiment which concerns on this invention.

符号の説明Explanation of symbols

１ 導体
２ 絶縁体層
３ 介在
４ シース
１０ 難燃ケーブル
１１ 難燃電線 DESCRIPTION OF SYMBOLS 1 Conductor 2 Insulator layer 3 Interposition 4 Sheath 10 Flame retardant cable 11 Flame retardant electric wire

Claims (4)

エチレン・酢酸ビニル共重合体５０〜８０重量部と、ポリプロピレン１０〜３０重量部と、エチレンと炭素数が３〜８のαオレフィンのコモノマーを共重合させた共重合ポリマを無水マレイン酸で変性したマレイン酸変性エチレン共重合体１０〜２０重量部とからなるポリマー１００重量部に対し、シラン処理水酸化マグネシウムを１００〜２５０重量部混和してなることを特徴とするノンハロゲン難燃樹脂組成物。   A copolymer polymer obtained by copolymerizing 50-80 parts by weight of ethylene / vinyl acetate copolymer, 10-30 parts by weight of polypropylene, and a comonomer of ethylene and an α-olefin having 3 to 8 carbon atoms was modified with maleic anhydride. A non-halogen flame retardant resin composition comprising 100 to 250 parts by weight of silanized magnesium hydroxide mixed with 100 parts by weight of a polymer composed of 10 to 20 parts by weight of a maleic acid-modified ethylene copolymer. 上記樹脂組成物をＵＩＣ（国際車輌連合）規格に基づき速度３００〜５００ｍｍ／ｍｉｎで引張ったときの伸び率が２００％以上である請求項１記載のノンハロゲン難燃樹脂組成物。   The non-halogen flame retardant resin composition according to claim 1, wherein the resin composition has an elongation percentage of 200% or more when pulled at a speed of 300 to 500 mm / min based on UIC (International Vehicle Association) standards. 上記請求項１又は２に記載の樹脂組成物により、導体を被覆する絶縁体層を形成したことを特徴とするノンハロゲン難燃電線。   A non-halogen flame-retardant electric wire, wherein an insulator layer for covering a conductor is formed from the resin composition according to claim 1. 上記請求項１又は２に記載の樹脂組成物により、絶縁電線を被覆するケーブルシースを形成したことを特徴とするノンハロゲン難燃ケーブル。   A non-halogen flame retardant cable, wherein a cable sheath for covering an insulated wire is formed from the resin composition according to claim 1 or 2.
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