JP2008156476A - Water-resistant flame-retardant resin composition and insulated electric wire - Google Patents
Water-resistant flame-retardant resin composition and insulated electric wire Download PDFInfo
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本発明は、高い難燃性、電気絶縁性、耐水性に優れ、電子機器用電線等の被覆材などとして好適なハロゲンフリーの耐水性難燃樹脂組成物に関するものである。 The present invention relates to a halogen-free water-resistant flame-retardant resin composition that is excellent in high flame retardancy, electrical insulation, and water resistance, and is suitable as a coating material for electric wires for electronic devices.
電子機器用電線にはＵＬ認定が必要である。難燃性はＵＬ９４に示されたＶＷ−１燃焼試験方法により、非常に高難燃性が要求される。
従来、ハロゲンフリーの難燃性樹脂組成物としては、エチレン−酢酸ビニル共重合体（以下、ＥＶＡと記す。）やエチレン−エチルアクリレート共重合体などのポリオレフィン系樹脂に、水酸化マグネシウム、水酸化アルミニウムなどの難燃剤、メラミンシアヌレート、ヒドロキシスズ酸亜鉛などの難燃助剤を配合したものが知られている（例えば、特許文献１参照。）。
また、シランカップリング剤やステアリン酸などで表面処理した水酸化マグネシウムなどを用いて、樹脂組成物の機械特性を高めることも知られている（例えば、特許文献２参照。）。
さらに、ＥＶＡやアクリルゴムなどの酸コポリマーに金属水和物などを多量に添加した難燃性組成物を導体上に被覆した後、電子線で被覆を架橋して得られる絶縁電線も提案されている（例えば、特許文献３参照。）。
UL certification is required for electric wires for electronic equipment. The flame retardancy is required to be very high flame retardancy by the VW-1 combustion test method shown in UL94.
Conventionally, halogen-free flame retardant resin compositions include polyolefin-based resins such as ethylene-vinyl acetate copolymer (hereinafter referred to as EVA) and ethylene-ethyl acrylate copolymer, magnesium hydroxide, hydroxide A compound containing a flame retardant such as aluminum and a flame retardant aid such as melamine cyanurate or zinc hydroxystannate is known (for example, see Patent Document 1).
It is also known to improve the mechanical properties of a resin composition using magnesium hydroxide surface-treated with a silane coupling agent or stearic acid (for example, see Patent Document 2).
Furthermore, an insulated wire obtained by coating a flame retardant composition obtained by adding a large amount of metal hydrate to an acid copolymer such as EVA or acrylic rubber on a conductor and then crosslinking the coating with an electron beam has been proposed. (For example, refer to Patent Document 3).
このようなハロゲンフリーの難燃性樹脂組成物にあっては、焼却処分の際に有害なハロゲン化合物を発生することがなく、この樹脂組成物からなる被覆層を有する絶縁電線が、ＵＬ１５８１規格に規定されるＶＷ−１燃焼試験に合格する高難燃性を発揮し、良好な機械特性、加工性を有しており、例えば電子機器用絶縁電線の絶縁体、シースなどに用いられている。
しかしながら、このようなハロゲンフリーの難燃性樹脂組成物からなる絶縁体、シースを有する絶縁電線では、絶縁体、シースをなすハロゲンフリーの難燃性樹脂組成物が多量の水酸化マグネシウムなどの金属水酸化物を含有するため、吸湿しやすくなり、高湿度環境下あるいは水中での絶縁抵抗の低下が著しくなるという問題がある。例えばＥＶＡに水酸化マグネシウムを添加した場合、樹脂１００質量部に対して１５０質量部以上を添加すると、吸水による絶縁抵抗の低下が著しくなる。 However, in an insulated wire having an insulator and a sheath made of such a halogen-free flame-retardant resin composition, the halogen-free flame-retardant resin composition forming the insulator and sheath contains a large amount of metal such as magnesium hydroxide. Since it contains a hydroxide, it becomes easy to absorb moisture, and there is a problem that the insulation resistance is significantly reduced in a high humidity environment or in water. For example, when magnesium hydroxide is added to EVA, if 150 parts by mass or more is added to 100 parts by mass of the resin, the insulation resistance is significantly reduced due to water absorption.
また、導体への被覆が薄くなるほど絶縁抵抗値が低くなるため、被覆厚０．２５ｍｍ程度では絶縁性維持がより厳しくなる。反面、難燃性は被覆厚さが０．２５ｍｍ以下では０．３〜０．５ｍｍ程度の被覆厚さの時に比べＶＷ−１難燃性に必要な難燃剤の必要量は少なくなるメリットがある。 Further, since the insulation resistance value decreases as the coating on the conductor becomes thinner, the insulation maintenance becomes more severe at a coating thickness of about 0.25 mm. On the other hand, the flame retardancy has the merit that the required amount of flame retardant necessary for VW-1 flame retardancy is reduced when the coating thickness is 0.25 mm or less compared to the coating thickness of about 0.3 to 0.5 mm. .
本発明は、前記事情に鑑みてなされ、被覆厚さが０．３ｍｍ以下の絶縁電線の被覆材として特に有効であり、かつ耐水性に優れた耐水性難燃樹脂組成物の提供を目的とする。 The present invention has been made in view of the above circumstances, and an object thereof is to provide a water-resistant flame-retardant resin composition that is particularly effective as a coating material for insulated wires having a coating thickness of 0.3 mm or less and that is excellent in water resistance. .
前記目的を達成するため、本発明は、ポリプロピレン５０〜７０質量部、非晶質ポリプロピレン２５〜４９質量部、マレイン酸変性ポリエチレン１〜５質量部からなるベース樹脂１００質量部に、水酸化マグネシウム１００〜１５０質量部、メラミンシアヌート５〜２０質量部をそれぞれ配合したことを特徴とする耐水性難燃樹脂組成物を提供する。 In order to achieve the above object, the present invention relates to 100 parts by mass of magnesium hydroxide in 100 parts by mass of a base resin consisting of 50 to 70 parts by mass of polypropylene, 25 to 49 parts by mass of amorphous polypropylene, and 1 to 5 parts by mass of maleic acid-modified polyethylene. Provided is a water-resistant flame-retardant resin composition characterized by blending ˜150 parts by mass and 5-20 parts by mass of melamine cyanut.
また本発明は、前述した本発明に係る耐水性難燃樹脂組成物が導体上に被覆されてなり、ＵＬ１５８１に規定されるＶＷ−１燃焼試験に合格する難燃性を有していることを特徴とする絶縁電線を提供する。
本発明の絶縁電線において、前記導体上の被覆厚さは０．３ｍｍ以下であることが好ましい。
Further, the present invention is such that the above-mentioned water-resistant flame retardant resin composition according to the present invention is coated on a conductor and has a flame retardance that passes the VW-1 combustion test defined in UL1581. A featured insulated wire is provided.
In the insulated wire of the present invention, the coating thickness on the conductor is preferably 0.3 mm or less.
本発明によれば、ＵＬ１５８１規格に規定されるＶＷ−１燃焼試験に合格する高難燃性を有し、吸水による絶縁抵抗の低下が小さい耐水性難燃樹脂組成物、及び該組成物からなる被覆を絶縁層として備え、耐水性、耐熱性に優れた絶縁電線を提供することができる。 According to the present invention, it comprises a water-resistant flame-retardant resin composition having high flame resistance that passes the VW-1 combustion test specified in the UL1581 standard, and having a small decrease in insulation resistance due to water absorption, and the composition. An insulation electric wire excellent in water resistance and heat resistance can be provided by providing a coating as an insulating layer.
本発明の耐水性難燃樹脂組成物は、ポリプロピレン５０〜７０質量部、非晶質ポリプロピレン２５〜４９質量部、マレイン酸変性ポリエチレン１〜５質量部からなるベース樹脂１００質量部に、水酸化マグネシウム１００〜１５０質量部、メラミンシアヌート５〜２０質量部をそれぞれ配合したことを特徴とする The water-resistant flame retardant resin composition of the present invention comprises magnesium hydroxide in 100 parts by mass of a base resin consisting of 50 to 70 parts by mass of polypropylene, 25 to 49 parts by mass of amorphous polypropylene, and 1 to 5 parts by mass of maleic acid-modified polyethylene. 100 to 150 parts by mass and 5 to 20 parts by mass of melamine cyanut are blended, respectively.
通常ＶＷ−１難燃性を得るには、難燃剤多量添加の必要性から、ＥＶＡなどをベースに、電子線架橋やシラン架橋により耐熱性と機械特性を向上させる手法が数多く提案されている。また、０．０３ｍｍ以下の薄い絶縁厚のものには、吸水による絶縁抵抗低下が深刻であると同時に、０．３〜０．５ｍｍ程度の厚さの電線よりもＶＷ−１合格に必要な難燃剤添加量は少なくて済む。
そこで本発明においては、ベース樹脂に高耐熱、高体積抵抗率のポリプロピレン樹脂を用い、被覆の薄い電線に有効な難燃処方により難燃剤の量を極力減量することにより、水中に２４時間浸漬したあとの絶縁抵抗が１０００（ＭΩ・ｋｍ）以上である耐水性難燃樹脂組成物および絶縁電線を得る。
In general, in order to obtain VW-1 flame retardancy, many techniques for improving heat resistance and mechanical properties by electron beam crosslinking or silane crosslinking have been proposed based on EVA or the like because of the necessity of adding a large amount of flame retardant. In addition, a thin insulation thickness of 0.03 mm or less has a serious decrease in insulation resistance due to water absorption, and at the same time, it is more difficult to pass VW-1 than an electric wire having a thickness of about 0.3 to 0.5 mm. The amount of added flame retardant is small.
Therefore, in the present invention, a polypropylene resin having a high heat resistance and a high volume resistivity is used as the base resin, and the amount of the flame retardant is reduced as much as possible by an effective flame retardant formulation for a thin coated wire, so that it is immersed in water for 24 hours. A water-resistant flame retardant resin composition and an insulated wire having a subsequent insulation resistance of 1000 (MΩ · km) or more are obtained.
本発明の耐水性難燃樹脂組成物に用いるポリプロピレンとしては、ホモポリプロピレンの他に、エチレン・プロピレンランダム共重合体、エチレン・プロピレンブロック共重合体や、プロピレンと他の少量のα−オレフィン（例えば１−ブテン、１−ヘキセン、４−メチル−１−ペンテン等）との共重合体、アタクチックポリプロピレン重合体を主成分とするポリプロピレン樹脂等が挙げられ、各種の市販品んの中から適宜選択して用いることができる。これらのポリプロピレン系樹脂は１種類でも良いし、２種類以上混合して使用することができる。 The polypropylene used in the water-resistant flame retardant resin composition of the present invention includes, in addition to homopolypropylene, an ethylene / propylene random copolymer, an ethylene / propylene block copolymer, and a small amount of propylene and other α-olefins (for example, 1-butene, 1-hexene, 4-methyl-1-pentene, etc.), polypropylene resins mainly composed of an atactic polypropylene polymer, and the like, and are appropriately selected from various commercially available products. Can be used. These polypropylene resins may be used alone or in combination of two or more.
本発明の耐水性難燃樹脂組成物に用いる非晶質ポリプロピレンとしては、チーグラー・ナッタ型触媒等を用いて、スラリー重合、気相重合、バルク重合、溶液重合あるいはこれらを組み合わせた重合法で、プロピレンを単独、あるいはプロピレンとエチレン等のα−オレフィンを共重合することによって得ることができる。また、該当市販品を用いることができる。本発明の耐水性難燃樹脂組成物において好ましい市販の非晶質ポリプロピレンとしては、例えば、住友化学社製のタフセレンＴ１７１２（商品名）が挙げられる。 As the amorphous polypropylene used in the water-resistant flame retardant resin composition of the present invention, using a Ziegler-Natta type catalyst or the like, slurry polymerization, gas phase polymerization, bulk polymerization, solution polymerization or a polymerization method combining these, It can be obtained by propylene alone or by copolymerizing propylene and an α-olefin such as ethylene. Moreover, a corresponding commercial item can be used. As a commercially available amorphous polypropylene preferable in the water-resistant flame retardant resin composition of the present invention, for example, Tough Selenium T1712 (trade name) manufactured by Sumitomo Chemical Co., Ltd. may be mentioned.
本発明の耐水性難燃樹脂組成物に用いるマレイン酸変性ポリエチレンとして、好ましい市販品としては、例えば、日本ポリエチレン社製のアドテックスＬ６１００Ｍ（商品名）が挙げられる。 As a maleic acid modified polyethylene used for the water resistant flame retardant resin composition of the present invention, as a preferable commercial product, for example, Adtex L6100M (trade name) manufactured by Nippon Polyethylene Co., Ltd. may be mentioned.
本発明の耐水性難燃樹脂組成物において、ポリプロピレン、非晶質ポリプロピレン及びマレイン酸変性ポリエチレンからなるベース樹脂１００質量部中のポリプロピレンの配合量は、５０〜７０質量部の範囲とする。ポリプロピレンの配合量が５０質量部未満であると、得られる耐水性難燃樹脂組成物の引張破断強度が低下する。一方、ポリプロピレンの配合量が７０質量部を超えると、得られる耐水性難燃樹脂組成物の引張破断伸びが悪化する。 In the water-resistant flame-retardant resin composition of the present invention, the blending amount of polypropylene in 100 parts by mass of the base resin composed of polypropylene, amorphous polypropylene and maleic acid-modified polyethylene is in the range of 50 to 70 parts by mass. If the blending amount of polypropylene is less than 50 parts by mass, the tensile strength at break of the resulting water resistant flame retardant resin composition is lowered. On the other hand, when the compounding amount of polypropylene exceeds 70 parts by mass, the tensile elongation at break of the resulting water resistant flame retardant resin composition is deteriorated.
また、ベース樹脂１００質量部中の非晶質ポリプロピレンの配合量は、２５〜４９質量部の範囲とする。非晶質ポリプロピレンの配合量が２５質量部未満であると、得られる耐水性難燃樹脂組成物の引張破断伸びが悪化する。一方、非晶質ポリプロピレンの配合量が４９質量部を超えると、得られる耐水性難燃樹脂組成物の引張破断強度が悪化する。 Moreover, the compounding quantity of the amorphous polypropylene in 100 mass parts of base resins shall be the range of 25-49 mass parts. When the blending amount of the amorphous polypropylene is less than 25 parts by mass, the tensile elongation at break of the resulting water resistant flame retardant resin composition is deteriorated. On the other hand, if the blending amount of amorphous polypropylene exceeds 49 parts by mass, the tensile strength at break of the resulting water resistant flame retardant resin composition is deteriorated.
また、ベース樹脂１００質量部中のマレイン酸変性ポリエチレンの配合量は、１〜５質量部の範囲とする。マレイン酸変性ポリエチレンの配合量が１質量部未満であると、得られる耐水性難燃樹脂組成物の引張破断強度が悪化する。一方、マレイン酸変性ポリエチレンの配合量が５質量部を超えると、得られる耐水性難燃樹脂組成物の引張破断伸びが悪化する。 The blending amount of maleic acid-modified polyethylene in 100 parts by mass of the base resin is in the range of 1 to 5 parts by mass. When the blending amount of maleic acid-modified polyethylene is less than 1 part by mass, the tensile strength at break of the resulting water resistant flame retardant resin composition is deteriorated. On the other hand, if the blending amount of maleic acid-modified polyethylene exceeds 5 parts by mass, the tensile elongation at break of the resulting water resistant flame retardant resin composition is deteriorated.
本発明の耐水性難燃樹脂組成物において、難燃剤としては、難燃性付与効果が大きい水酸化マグネシウムとメラミンシアヌレートとをベース樹脂に共配合する。この水酸化マグネシウムには、その平均粒子径が０．７〜１．３μｍのものが好ましく、さらには表面処理されたものがベースポリマーに対する親和性が高められ、分散性が向上して好ましい。 In the water-resistant flame retardant resin composition of the present invention, magnesium hydroxide and melamine cyanurate, which have a large effect of imparting flame retardancy, are co-blended with the base resin as a flame retardant. The magnesium hydroxide preferably has an average particle size of 0.7 to 1.3 μm, and is further preferably surface-treated so as to enhance the affinity for the base polymer and improve the dispersibility.
この表面処理には、ビニルシラン、メタクリルシラン、エポキシシランなどのシランカップリング剤、チタネートカップリング剤、ステアリン酸、オレイン酸などの高級脂肪酸などを用いる処理が採用されるが、なかでもビニルシランカップリング剤またはメタクリルシランカップリング剤で表面処理されたものがベースポリマーとの親和性が高められて好ましい。また、水酸化マグネシウム粒子表面における表面処理剤の存在量は０．１〜２質量％程度で十分である。 For this surface treatment, a treatment using a silane coupling agent such as vinyl silane, methacryl silane or epoxy silane, a titanate coupling agent, a higher fatty acid such as stearic acid or oleic acid, etc. is adopted. Or what was surface-treated with the methacryl silane coupling agent is preferable because the affinity with the base polymer is enhanced. Further, the amount of the surface treatment agent present on the surface of the magnesium hydroxide particles is about 0.1 to 2% by mass.
この水酸化マグネシウムの配合量は、ベース樹脂１００質量部に対して、１００〜１５０質量部の範囲とする。水酸化マグネシウムの配合量が１００質量部未満であると、得られる耐水性難燃樹脂組成物の難燃性が悪くなる。一方、水酸化マグネシウムの配合量が１５０質量部を超えると、得られる耐水性難燃樹脂組成物の耐水性が悪化する。 The compounding quantity of this magnesium hydroxide shall be the range of 100-150 mass parts with respect to 100 mass parts of base resins. When the blending amount of magnesium hydroxide is less than 100 parts by mass, the flame retardancy of the resulting water resistant flame retardant resin composition becomes poor. On the other hand, when the compounding quantity of magnesium hydroxide exceeds 150 mass parts, the water resistance of the obtained water-resistant flame-retardant resin composition will deteriorate.
またメラミンシアヌートの好ましい市販品としては、例えば、日産化学工業社製のＭＣ−８６０（商品名）が挙げられる。 Moreover, as a preferable commercial item of melamine cyanut, MC-860 (brand name) by Nissan Chemical Industries Ltd. is mentioned, for example.
このメラミンシアヌートの配合量は、ベース樹脂１００質量部に対して、５〜２０質量部の範囲とする。メラミンシアヌートの配合量が５質量部未満であると、水酸化マグネシウムをベース樹脂１００質量部に対して１５０質量部配合した場合でも、得られる耐水性難燃樹脂組成物の難燃性が悪くなる。一方、メラミンシアヌートの配合量が２０質量部を超えると、得られる耐水性難燃樹脂組成物の耐水性が悪化する。 The amount of melamine cyanut is 5 to 20 parts by mass with respect to 100 parts by mass of the base resin. When the blending amount of melamine cyanut is less than 5 parts by mass, even when 150 parts by mass of magnesium hydroxide is blended with respect to 100 parts by mass of the base resin, the resulting flame resistant flame retardant resin composition has poor flame retardancy. Become. On the other hand, when the compounding amount of melamine cyanut exceeds 20 parts by mass, the water resistance of the resulting water resistant flame retardant resin composition is deteriorated.
本発明の耐水性難燃樹脂組成物では、前述した必須成分以外に、難燃助剤、酸化防止剤、紫外線吸収剤、銅害防止剤、帯電防止剤、滑剤、加工助剤、着色剤、無機充填剤などの添加剤を適宜配合することができる。 In the water-resistant flame retardant resin composition of the present invention, in addition to the essential components described above, a flame retardant aid, an antioxidant, an ultraviolet absorber, a copper damage inhibitor, an antistatic agent, a lubricant, a processing aid, a colorant, Additives such as inorganic fillers can be appropriately blended.
本発明の絶縁電線は、前述した耐水性難燃樹脂組成物からなる絶縁体または絶縁体とシースを有するもので、導体上もしくは絶縁体上に周知の押出被覆法により前記耐水性難燃樹脂組成物を被覆して絶縁体あるいはシースを形成したものである。この絶縁電線の被覆の厚さは、０．３ｍｍ以下とすることが望ましい。
本発明の絶縁電線は、ＵＬ１５８１に規定されるＶＷ−１燃焼試験に合格する難燃性を有するものである。
本発明の絶縁電線は、水中に２４時間浸漬したあとの絶縁抵抗が１０００（ＭΩ・ｋｍ）以上である優れた耐水性を有する。
本発明の耐水性難燃樹脂組成物及び絶縁電線は、塩素などのハロゲン元素が含まれないので、これらを焼却処分する際に、有害なハロゲン含有ガスが発生することがない。
以下、実施例により本発明の効果を実証する。
The insulated wire of the present invention has an insulator made of the water-resistant flame-retardant resin composition described above or an insulator and a sheath, and the water-resistant flame-retardant resin composition is formed on a conductor or an insulator by a well-known extrusion coating method. An insulator or a sheath is formed by covering an object. The thickness of the insulated wire coating is desirably 0.3 mm or less.
The insulated wire of the present invention has flame retardancy that passes the VW-1 combustion test specified in UL1581.
The insulated wire of the present invention has excellent water resistance with an insulation resistance of 1000 (MΩ · km) or more after being immersed in water for 24 hours.
Since the water-resistant flame retardant resin composition and the insulated wire of the present invention do not contain halogen elements such as chlorine, no harmful halogen-containing gas is generated when these are incinerated.
Hereinafter, the effects of the present invention will be demonstrated by examples.
表１（実施例１〜８）、及び表２（比較例１〜１０）に示す配合組成（単位：質量部）の樹脂組成物を配合し、バンバリーにより１８０℃で５分間混練した。その際、表１及び表２中に記した各配合成分に加え、加工助剤としてベース樹脂１００質量部に対し５質量部のステアリン酸、及び２質量部の酸化防止剤を添加した。
混練後、押出機にて、ＡＷＧ２６（７／０．１６ＴＡ）の導体上に押出被覆を行い、絶縁厚０．３ｍｍの被覆を形成した。
得られた絶縁電線について、以下の評価を行った。
The resin compositions having the blending compositions (units: parts by mass) shown in Table 1 (Examples 1 to 8) and Table 2 (Comparative Examples 1 to 10) were blended and kneaded at 180 ° C. for 5 minutes. In that case, in addition to each compounding component described in Table 1 and Table 2, 5 mass parts stearic acid and 2 mass parts antioxidant were added with respect to 100 mass parts of base resins as a processing aid.
After kneading, extrusion coating was performed on the conductor of AWG26 (7 / 0.16TA) with an extruder to form a coating with an insulation thickness of 0.3 mm.
The following evaluation was performed about the obtained insulated wire.
評価項目 （合否判断基準）
・引張破断強度 （１０ＭＰａ以上合格）
・引張破断伸び （１５０％以上合格）
・難燃性 （ＵＬ１５８１規格ＶＷ−１燃焼試験、５本中５本合格）
・絶縁抵抗 （絶縁電線を水道水に浸漬して２４時間後の絶縁抵抗を測定し、２３℃で１０００ＭΩ・ｋｍ以上を合格）
Evaluation items (acceptance criteria)
・ Tensile strength at break (passed 10MPa or more)
-Tensile elongation at break (over 150% passed)
・ Flame retardancy (UL 1581 standard VW-1 combustion test, 5 out of 5 passed)
・ Insulation resistance (Measurement of insulation resistance after 24 hours of dipping the insulated wire in tap water and passing 1000 MΩ · km or more at 23 ° C)
引張破断強度及び引張破断伸びは、ＵＬ１５８１（PHYSICAL PROPERTIES TESTS OF INSULATION AND JACKET）に記載の方法に従って測定した。 The tensile strength at break and the tensile elongation at break were measured according to the method described in UL1581 (PHYSICAL PROPERTIES TESTS OF INSULATION AND JACKET).
表１及び表２において、各配合成分は以下の市販品を用いた。
ポリプロピレン（表１，表２中「ＰＰ」と記す）は、Ｅ−１１１Ｇ（商品名、三井化学社製）を用いた。
非晶質ポリプロピレン（表１，表２中「非晶質ＰＰ」と記す）は、タフセレンＴ１７１２（商品名、住友化学社製）を用いた。
マレイン酸変性ポリエチレン（表１，表２中「マレイン酸変性ＰＥ」と記す）は、アドテックスＬ６１００Ｍ（商品名、日本ポリエチレン社製）を用いた。
水酸化マグネシウムは、キスマ５Ｌ（商品名、協和化学社製）を用いた。
メラミンシアンレートは、ＭＣ−８６０（商品名、日産化学工業社製）を用いた。
In Tables 1 and 2, the following commercially available products were used as the blending components.
E-111G (trade name, manufactured by Mitsui Chemicals, Inc.) was used as the polypropylene (indicated as “PP” in Tables 1 and 2).
Tough selenium T1712 (trade name, manufactured by Sumitomo Chemical Co., Ltd.) was used as the amorphous polypropylene (referred to as “amorphous PP” in Tables 1 and 2).
As a maleic acid-modified polyethylene (referred to as “maleic acid-modified PE” in Tables 1 and 2), Adtex L6100M (trade name, manufactured by Nippon Polyethylene Co., Ltd.) was used.
As the magnesium hydroxide, Kisuma 5L (trade name, manufactured by Kyowa Chemical Co., Ltd.) was used.
MC-860 (trade name, manufactured by Nissan Chemical Industries, Ltd.) was used as the melamine cyanate.
表１に示す本発明に係る実施例１〜８は、十分な引張破断強度と引張破断伸び、十分な難燃性及び耐水性（絶縁抵抗）を達成することができた。 Examples 1 to 8 according to the present invention shown in Table 1 were able to achieve sufficient tensile breaking strength and tensile breaking elongation, sufficient flame retardancy and water resistance (insulation resistance).
一方、表２に示す比較例１は、ポリプロピレンが本発明の範囲未満で且つ非晶質ポリプロピレンが過剰としたものであり、引張破断強度が不合格となった。
比較例２は、ポリプロピレンが過剰で且つ非晶質ポリプロピレンが本発明の範囲未満としたものであり、引張破断伸びが不合格となった。
比較例３は、ポリプロピレンが本発明の範囲未満、非晶質ポリプロピレンが過剰であり且つマレイン酸変性ポリエチレンを配合していないものであり、引張破断強度が不合格となった。
比較例４は、ポリプロピレンが過剰、非晶質ポリプロピレンが本発明の範囲未満であり且つマレイン酸変性ポリエチレンを配合していないものであり、引張破断強度及び引張破断伸びが不合格となった。
比較例５は、ポリプロピレンが本発明の範囲未満で且つマレイン酸変性ポリエチレンを過剰に配合したものであり、引張破断伸びが不合格となった。
比較例６は、非晶質ポリプロピレンが本発明の範囲未満で且つマレイン酸変性ポリエチレンを過剰に配合したものであり、引張破断伸びが不合格となった。
比較例７は、水酸化マグネシウムが本発明の範囲未満であり、難燃性が不合格となった。
比較例８は、メラミンシアヌレートを配合していないものであり、難燃性が不合格となった。
比較例９は、水酸化マグネシウムを本発明における下限値としメラミンシアヌレートを過剰に配合したものであり、耐水性（絶縁抵抗）が不合格となった。
比較例１０は、水酸化マグネシウムを本発明における上限値としメラミンシアヌレートを過剰に配合したものであり、耐水性（絶縁抵抗）が不合格となった。
On the other hand, in Comparative Example 1 shown in Table 2, the polypropylene was less than the range of the present invention and the amorphous polypropylene was excessive, and the tensile strength at break was rejected.
In Comparative Example 2, the polypropylene was excessive and the amorphous polypropylene was less than the range of the present invention, and the tensile elongation at break was unacceptable.
In Comparative Example 3, the polypropylene was less than the range of the present invention, the amorphous polypropylene was excessive, and the maleic acid-modified polyethylene was not blended, and the tensile strength at break was rejected.
In Comparative Example 4, the amount of polypropylene was excessive, the amount of amorphous polypropylene was less than the range of the present invention, and maleic acid-modified polyethylene was not blended, and the tensile strength at break and tensile elongation at break were unacceptable.
In Comparative Example 5, polypropylene was less than the range of the present invention, and maleic acid-modified polyethylene was excessively blended, and the tensile elongation at break was unacceptable.
In Comparative Example 6, the amorphous polypropylene was less than the range of the present invention and the maleic acid-modified polyethylene was excessively blended, and the tensile elongation at break was unacceptable.
In Comparative Example 7, magnesium hydroxide was less than the range of the present invention, and the flame retardancy was rejected.
In Comparative Example 8, melamine cyanurate was not blended, and the flame retardancy was rejected.
In Comparative Example 9, magnesium hydroxide was used as the lower limit in the present invention and melamine cyanurate was excessively blended, and the water resistance (insulation resistance) was rejected.
In Comparative Example 10, magnesium hydroxide was used as the upper limit in the present invention and melamine cyanurate was excessively blended, and the water resistance (insulation resistance) was rejected.
Claims (3)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006346901A JP2008156476A (en) | 2006-12-25 | 2006-12-25 | Water-resistant flame-retardant resin composition and insulated electric wire |
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| JP2006346901A JP2008156476A (en) | 2006-12-25 | 2006-12-25 | Water-resistant flame-retardant resin composition and insulated electric wire |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110885538A (en) * | 2019-12-08 | 2020-03-17 | 周佩珍 | Flame-retardant high-temperature-resistant electric wire and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110885538A (en) * | 2019-12-08 | 2020-03-17 | 周佩珍 | Flame-retardant high-temperature-resistant electric wire and manufacturing method thereof |
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