JP2012089287A - Vinyl chloride resin composition for coating electric wire/cable - Google Patents
Vinyl chloride resin composition for coating electric wire/cable Download PDFInfo
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本発明は、電線・ケーブルの被覆材料として用いられる塩化ビニル樹脂組成物に関する。 The present invention relates to a vinyl chloride resin composition used as a coating material for electric wires and cables.
塩化ビニル樹脂組成物は、電気的特性、機械的特性が良好で、かつ優れた難燃性を有することから、電線・ケーブルの被覆材料として広く使用されている。この塩化ビニル樹脂組成物には、柔軟性を付与し、また機械的特性を向上させる目的で、可塑剤が配合されている。可塑剤としては、フタル酸ジ（２−エチルヘキシル）（ＤＯＰ）、フタル酸ジイソノニル（ＤＩＮＰ）などのフタル酸エステルが一般に使用されている（例えば、特許文献１参照。）。 A vinyl chloride resin composition is widely used as a coating material for electric wires and cables because it has excellent electrical and mechanical properties and excellent flame retardancy. This vinyl chloride resin composition is blended with a plasticizer for the purpose of imparting flexibility and improving mechanical properties. As the plasticizer, phthalic acid esters such as di (2-ethylhexyl) phthalate (DOP) and diisononyl phthalate (DINP) are generally used (for example, see Patent Document 1).
しかしながら、近時、これらの塩化ビニル樹脂組成物の可塑剤として使用されているフタル酸エステルは、人体に対する安全性や環境汚染性の点から、その使用が制限されつつあり、一部の用途では既に使用が禁止されたものもある。このため、電線・ケーブル分野においても、従来のフタル酸エステルに代わる安全性の高い可塑剤を使用した塩化ビニル樹脂組成物の開発が緊急の課題となってきている。 However, recently, the use of phthalic acid esters used as plasticizers in these vinyl chloride resin compositions is being restricted from the viewpoint of safety to the human body and environmental pollution, and in some applications, Some have already been banned. For this reason, in the field of electric wires and cables, the development of a vinyl chloride resin composition using a highly safe plasticizer in place of the conventional phthalate ester has become an urgent issue.
本発明はこのような従来技術の課題を解決するためになされたもので、安全性の高い可塑剤を用いることによって、人体に対する安全性、耐環境汚染性に優れ、かつ従来の塩化ビニル樹脂組成物に匹敵する良好な電気的特性、機械的特性、難燃性などを有する電線・ケーブル被覆用塩化ビニル樹脂組成物を提供することを目的とする。 The present invention has been made to solve such problems of the prior art. By using a highly safe plasticizer, the present invention is excellent in safety to the human body and resistance to environmental pollution, and a conventional vinyl chloride resin composition. An object of the present invention is to provide a vinyl chloride resin composition for covering electric wires / cables, which has good electrical characteristics, mechanical characteristics, flame retardancy, and the like comparable to those.
本発明者らは、上記の目的を達成するため鋭意研究を重ねた結果、可塑剤としてイソフタル酸ジ（２−エチルヘキシル）（ＤＯＩＰ）および／またはイソフタル酸ジイソノニル（ＤＩＮＩＰ）を配合することにより、人体に対する安全性、に優れ、かつ良好な電気的特性、機械的特性、難燃性などを有する電線・ケーブル被覆用塩化ビニル樹脂組成物が得られることを見出し、本発明を完成するに至った。 As a result of intensive studies to achieve the above-mentioned object, the present inventors have blended di (2-ethylhexyl) isophthalate (DOIP) and / or diisononyl isophthalate (DINIP) as a plasticizer. The present inventors have found that a vinyl chloride resin composition for covering electric wires and cables having excellent safety with respect to electricity and having good electrical characteristics, mechanical characteristics, flame retardancy, etc. can be obtained, and the present invention has been completed.
すなわち、本発明の電線・ケーブル被覆用塩化ビニル樹脂組成物は、（Ａ）ポリ塩化ビニル１００質量部に対し、（Ｂ）イソフタル酸エステル系可塑剤１０〜１２０質量部、および（Ｃ）安定剤１〜１０質量部を含有する塩化ビニル樹脂組成物であって、前記（Ｂ）イソフタル酸エステル系可塑剤が、イソフタル酸ジ（２−エチルヘキシル）および／またはイソフタル酸ジイソノニルであることを特徴とするものである。 That is, the vinyl chloride resin composition for covering electric wires and cables of the present invention comprises (B) 10 to 120 parts by mass of an isophthalate plasticizer and (C) a stabilizer with respect to 100 parts by mass of (A) polyvinyl chloride. A vinyl chloride resin composition containing 1 to 10 parts by mass, wherein the (B) isophthalic acid ester plasticizer is di (2-ethylhexyl) isophthalate and / or diisononyl isophthalate. Is.
本発明によれば、人体に対する安全性に優れ、かつ良好な電気的特性、機械的特性、難燃性などを有する電線・ケーブル被覆用塩化ビニル樹脂組成物が提供される。 ADVANTAGE OF THE INVENTION According to this invention, the vinyl chloride resin composition for electric wire and cable coating | cover which is excellent in the safety | security with respect to a human body, and has a favorable electrical property, a mechanical characteristic, a flame retardance, etc. is provided.
以下、本発明の実施の形態について説明する。 Embodiments of the present invention will be described below.
本発明に使用される（Ａ）成分のポリ塩化ビニルは、電線・ケーブル被覆用として用いられているものであれば、特に制限されることなく使用される。ポリ塩化ビニルの重合度（数平均重合度）は、好ましくは７００〜４０００であり、より好ましくは９００〜２５００である。ポリ塩化ビニルは、１種を単独で使用してもよく、２種以上を組み合わせて使用してもよい。 The polyvinyl chloride as the component (A) used in the present invention is not particularly limited as long as it is used for covering electric wires and cables. The degree of polymerization (number average degree of polymerization) of polyvinyl chloride is preferably 700 to 4000, and more preferably 900 to 2500. Polyvinyl chloride may be used alone or in combination of two or more.
本発明に使用される（Ｂ）成分のイソフタル酸エステル系可塑剤は、下記式（１）で示されるイソフタル酸ジ（２−エチルヘキシル）（ＤＯＩＰ）および／または下記式（２）で示されるイソフタル酸ジイソノニル（ＤＩＮＩＰ）である。 The (B) component isophthalate plasticizer used in the present invention is isophthalic acid di (2-ethylhexyl) (DOIP) represented by the following formula (1) and / or isophthalic acid represented by the following formula (2). Diisononyl acid (DINIP).
イソフタル酸ジ（２−エチルヘキシル）および／またはイソフタル酸ジイソノニルを用いることにより、人体に対する安全性、耐環境汚染性を高めることができるとともに、電気的特性、機械的特性、難燃性などについては、従来のフタル酸ジ（２−エチルヘキシル）（ＤＯＰ）などを可塑剤として用いた電線・ケーブル被覆用塩化ビニル樹脂組成物に匹敵する特性を備えたものとすることができる。 By using di (2-ethylhexyl) isophthalate and / or diisononyl isophthalate, safety to the human body and environmental pollution resistance can be improved, and electrical characteristics, mechanical characteristics, flame retardancy, etc. It can be provided with properties comparable to conventional vinyl chloride resin compositions for covering electric wires and cables using di (2-ethylhexyl) phthalate (DOP) or the like as a plasticizer.
この（Ｂ）成分のイソフタル酸エステル系可塑剤の配合量は、（Ａ）成分のポリ塩化ビニル１００質量部に対して、１０〜１２０質量部、好ましくは２０〜８０質量部、より好ましくは３０〜７０質量部である。配合量が１０質量部未満では柔軟性が得られないうえ、機械的特性も十分に得られないおそれがある。また、配合量が１２０質量部を超えると、表面へのブリード、およびベタツキによる粘着などが生ずるおそれがある。 The blending amount of the (B) component isophthalic acid ester plasticizer is 10 to 120 parts by mass, preferably 20 to 80 parts by mass, more preferably 30 to 100 parts by mass of the polyvinyl chloride of the (A) component. -70 mass parts. If the blending amount is less than 10 parts by mass, flexibility may not be obtained and sufficient mechanical properties may not be obtained. On the other hand, if the blending amount exceeds 120 parts by mass, bleeding to the surface and sticking due to stickiness may occur.
なお、本発明においては、必要に応じて、本発明の効果を損なわない範囲で、イソフタル酸エステル系可塑剤以外の可塑剤を配合することができる。イソフタル酸エステル系可塑剤以外の可塑剤としては、例えば、トリメリット酸トリ（２−エチルヘキシル）（ＴＯＴＭ）、トリメリット酸トリイソデシル（ＴＩＤＴＭ）、ピロメリット酸トリ（２−エチルヘキシル）、アジピン酸ジ（２−エチルヘキシル）（ＤＯＡ）、アジピン酸ジイソデシル（ＤＩＤＡ）、アゼライン酸ジ（２−エチルヘキシル）（ＤＯＺ）、セバシン酸ジ（２−エチルヘキシル）（ＤＯＳ）などが挙げられる。また、エポキシ化大豆油、エポキシ化亜麻仁油、アジピン酸系ポリエステルなども使用可能である。上記イソフタル酸エステル系可塑剤とともに併用する可塑剤としては、耐環境汚染性の観点からは、セバシン酸ジ（２−エチルヘキシル）、エポキシ化大豆油が好ましい。 In the present invention, if necessary, a plasticizer other than the isophthalic ester plasticizer can be blended within a range that does not impair the effects of the present invention. Examples of plasticizers other than the isophthalic acid ester plasticizer include trimellitic acid tri (2-ethylhexyl) (TOTM), trimellitic acid triisodecyl (TIDTM), pyromellitic acid tri (2-ethylhexyl), and adipic acid di ( 2-ethylhexyl) (DOA), diisodecyl adipate (DIDA), di (2-ethylhexyl) azelate (DOZ), di (2-ethylhexyl) sebacate (DOS), and the like. Epoxidized soybean oil, epoxidized linseed oil, adipic acid-based polyester, and the like can also be used. As a plasticizer used together with the above-mentioned isophthalic acid ester plasticizer, di (2-ethylhexyl) sebacate and epoxidized soybean oil are preferable from the viewpoint of environmental pollution resistance.
本発明に使用される（Ｃ）成分の安定剤としては、カルシウム（Ｃａ）−亜鉛（Ｚｎ）系安定剤、バリウム（Ｂａ）−亜鉛（Ｚｎ）系安定剤などの金属塩系安定剤；水酸化カルシウムなどの弱塩基性無機化合物；エポキシ系安定剤；ポリオール類；ホスファイト類；三塩基性硫酸鉛などの無機酸塩類、オクチルスズラウレート、オクチルスズマレートなどの有機スズ化合物などが挙げられる。安定剤は、１種を単独で使用してもよく、２種以上を組み合わせて使用してもよい。環境保全性の観点からは、金属塩系安定剤、弱塩基性無機化合物、エポキシ系安定剤；ポリオール類；ホスファイト類が好ましく、金属塩系安定剤がより好ましく、金属塩系安定剤のなかでも、カルシウム（Ｃａ）−亜鉛（Ｚｎ）系安定剤が特に好ましい。カルシウム（Ｃａ）−亜鉛（Ｚｎ）系安定剤には、ハイドロタルサイトを含有するものと含有しないものがあるが、そのいずれであってもよい。カルシウム（Ｃａ）−亜鉛（Ｚｎ）系安定剤の市販品を例示すると、例えば、品川化工（株)製のＥＺＦシリーズ、（株）ＡＤＥＫＡ製のＲＵＰシリーズ（以上、いずれも商品名）などが挙げられる。これらの市販のカルシウム（Ｃａ）−亜鉛（Ｚｎ）系安定剤は、いずれもハイドロタルサイトを主成分とするものである。 As the stabilizer for the component (C) used in the present invention, metal salt stabilizers such as calcium (Ca) -zinc (Zn) stabilizer, barium (Ba) -zinc (Zn) stabilizer; water Weakly basic inorganic compounds such as calcium oxide; epoxy stabilizers; polyols; phosphites; inorganic acid salts such as tribasic lead sulfate, and organic tin compounds such as octyltin laurate and octyltin malate It is done. A stabilizer may be used individually by 1 type and may be used in combination of 2 or more type. From the viewpoint of environmental conservation, metal salt stabilizers, weakly basic inorganic compounds, epoxy stabilizers; polyols; phosphites are preferred, metal salt stabilizers are more preferred, and among metal salt stabilizers However, a calcium (Ca) -zinc (Zn) stabilizer is particularly preferable. Some calcium (Ca) -zinc (Zn) stabilizers contain hydrotalcite and some do not contain it. Examples of commercially available calcium (Ca) -zinc (Zn) stabilizers include, for example, the EZF series manufactured by Shinagawa Chemical Co., Ltd., the RUP series manufactured by ADEKA Corporation (all of which are trade names), and the like. It is done. Any of these commercially available calcium (Ca) -zinc (Zn) stabilizers is mainly composed of hydrotalcite.
なお、熱安定性および環境保全性の観点からは、カルシウム（Ｃａ）−亜鉛（Ｚｎ）系安定剤を（Ｃ）成分全体の少なくとも５０質量％、より好ましくは少なくとも７０質量％使用することが好ましい。 From the viewpoint of thermal stability and environmental conservation, it is preferable to use a calcium (Ca) -zinc (Zn) -based stabilizer at least 50% by mass, more preferably at least 70% by mass, based on the total component (C). .
この（Ｃ）成分の安定剤の配合量は、（Ａ）成分のポリ塩化ビニル１００質量部に対して１〜１０質量部、好ましくは２〜７質量部、より好ましくは３〜５質量部である。配合量が１質量部未満では熱安定性が得られないうえ、加工特性も十分に得られないおそれがある。また、配合量が１０質量部を超えるとブルームするおそれがある。 The amount of the component (C) stabilizer is 1 to 10 parts by weight, preferably 2 to 7 parts by weight, and more preferably 3 to 5 parts by weight with respect to 100 parts by weight of the polyvinyl chloride of the component (A). is there. If the blending amount is less than 1 part by mass, thermal stability cannot be obtained, and processing characteristics may not be sufficiently obtained. Moreover, there exists a possibility that it may bloom when a compounding quantity exceeds 10 mass parts.
本発明の電線・ケーブル被覆用塩化ビニル樹脂組成物には、以上の各成分のほか、必要に応じて、本発明の効果を阻害しない範囲で、充填剤、難燃剤、滑剤、酸化防止剤、光安定剤、加工助剤、架橋剤、架橋助剤、滑剤、着色剤、その他の添加剤を配合することができる。 In addition to the above components, the vinyl chloride resin composition for covering electric wires and cables of the present invention, if necessary, in a range not impairing the effects of the present invention, fillers, flame retardants, lubricants, antioxidants, Light stabilizers, processing aids, crosslinking agents, crosslinking aids, lubricants, colorants, and other additives can be blended.
例えば、充填剤としては、炭酸カルシウム、クレー、溶融シリカ、結晶シリカ、アルミナ、ジルコニア、タルク、マイカ、チタンホワイト、ベンガラ、炭化珪素、窒化ホウ素、窒化珪素、窒化アルミなどが挙げられる。炭酸カルシウムは、重質炭酸カルシウムおよび軽質炭酸カルシウムのいずれも使用可能であり、また、これらを脂肪酸などで表面処理したものも使用することができる。充填剤を配合することにより、加工性、電気特性、耐ブリード性などを向上させることができる。耐ブリード性を高める観点からは、特に、炭酸カルシウム、クレーが好ましい。充填剤は、（Ａ）成分のポリ塩化ビニル１００質量部に対して、通常、０〜１００質量部配合される。好ましくは１０〜８０質量部であり、より好ましくは２０〜６０質量部である。 Examples of the filler include calcium carbonate, clay, fused silica, crystalline silica, alumina, zirconia, talc, mica, titanium white, bengara, silicon carbide, boron nitride, silicon nitride, and aluminum nitride. As the calcium carbonate, both heavy calcium carbonate and light calcium carbonate can be used, and those obtained by surface treatment with a fatty acid or the like can also be used. By blending a filler, processability, electrical properties, bleed resistance, and the like can be improved. From the viewpoint of improving the bleed resistance, calcium carbonate and clay are particularly preferable. The filler is usually blended in an amount of 0 to 100 parts by mass with respect to 100 parts by mass of the polyvinyl chloride as the component (A). Preferably it is 10-80 mass parts, More preferably, it is 20-60 mass parts.
また、難燃剤としては、三酸化アンチモン、酸化亜鉛などの金属酸化物、水酸化マグネシウム、水酸化カルシウム、水酸化アルミニウムなどの金属水酸化物、スズ酸亜鉛、ホウ酸亜鉛などの亜鉛化合物などが例示される。滑剤としては、炭化水素系、脂肪酸系、脂肪酸アミド系、エステル系、アルコール系などが挙げられる。架橋助剤としては、トリメチロールプロパントリ（メタ）アクリレートなどの（メタ）アクリレート化合物などが挙げられる。 Examples of flame retardants include metal oxides such as antimony trioxide and zinc oxide, metal hydroxides such as magnesium hydroxide, calcium hydroxide and aluminum hydroxide, and zinc compounds such as zinc stannate and zinc borate. Illustrated. Examples of the lubricant include hydrocarbons, fatty acids, fatty acid amides, esters, and alcohols. Examples of the crosslinking aid include (meth) acrylate compounds such as trimethylolpropane tri (meth) acrylate.
本発明の電線・ケーブル被覆用塩化ビニル樹脂組成物は、上記したような（Ａ）〜（Ｃ）成分と、必要に応じて配合される前述した各種成分とを、バンバリーミキサ、タンブラー、加圧ニーダ、混練押出機、ミキシングローラなどの通常の混練機を用いて均一に混合することにより容易に製造することができる。 The vinyl chloride resin composition for covering electric wires and cables of the present invention comprises the above-described components (A) to (C) and the above-described various components that are blended as necessary. It can be easily produced by uniform mixing using a conventional kneader such as a kneader, a kneading extruder, or a mixing roller.
また、このようにして得られた本発明の電線・ケーブル被覆用塩化ビニル樹脂組成物を、導体外周に直接もしくは他の被覆を介して押出被覆することにより、電線・ケーブルが製造される。組成物は、被覆後もしくは成形後、必要に応じて常法により架橋される。 Moreover, an electric wire and a cable are manufactured by carrying out the extrusion coating of the vinyl chloride resin composition for electric wire and cable coating | cover of this invention obtained in this way to a conductor outer periphery directly or through another coating | cover. The composition is crosslinked by a conventional method after coating or molding, if necessary.
上記電線・ケーブルにおいては、人体に対する安全性が高く、かつ電気的特性、機械的特性、難燃性にも優れる絶縁体を備えることができる。 The electric wire / cable can be provided with an insulator that is highly safe to the human body and is excellent in electrical characteristics, mechanical characteristics, and flame retardancy.
なお、本発明は以上説明した実施の形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の形態で実施することができることは言うまでもない。 The present invention is not limited to the embodiment described above, and it is needless to say that the present invention can be implemented in various forms without departing from the gist of the present invention.
次に、本発明を実施例によりさらに詳細に説明するが、本発明はこれらの実施例に何ら限定されるものではない。なお、実施例および比較例で用いた成分は以下の通りである。 EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples at all. In addition, the component used by the Example and the comparative example is as follows.
ポリ塩化ビニル：信越化学工業（株）製 商品名 ＴＫ−１０００
（平均重合度１０００、ＫＶ＝６５）
ＤＯＩＰ：イソフタル酸ジ（２−エチルヘキシル）
ＤＩＮＩＰ：イソフタル酸ジイソノニル
ＤＯＴＰ：テレフタル酸ジ（２−エチルヘキシル）
ＤＯＰ：フタル酸ジ（２−エチルヘキシル）
ＤＩＮＰ：フタル酸ジイソノニル
ＤＩＤＰ：フタル酸ジイソデシル
ＤＵＰ：フタル酸ジウンデシル
Ｃａ／Ｚｎ系安定剤：品川化工（株）製 商品名 ＥＺＦ
クレー：ＢＡＳＦ製 商品名 ＳＰ３３
（平均粒径 １．０μｍ）
重質炭酸カルシウム：備北粉化工業（株）製 商品名 ソフトン１２００
（平均粒径 １．８μｍ）
軽質炭酸カルシウム：竹原化学工業（株）製 商品名 ネオライトＳＰ
（平均粒径 ０．０８μｍ）
Polyvinyl chloride: Shin-Etsu Chemical Co., Ltd. Product name TK-1000
(Average polymerization degree 1000, KV = 65)
DOIP: Di (2-ethylhexyl) isophthalate
DINIP: diisononyl isophthalate DOTP: di (2-ethylhexyl) terephthalate
DOP: Di (2-ethylhexyl) phthalate
DINP: diisononyl phthalate DIDP: diisodecyl phthalate DUP: diundecyl phthalate Ca / Zn stabilizer: manufactured by Shinagawa Chemicals Co., Ltd. EZF
Clay: Product name SP33 manufactured by BASF
(Average particle size 1.0μm)
Heavy calcium carbonate: Product name Softon 1200, manufactured by Bihoku Powder Chemical Co., Ltd.
(Average particle size 1.8μm)
Light calcium carbonate: Takehara Chemical Industry Co., Ltd. Product name Neolite SP
(Average particle size 0.08μm)
実施例１
ポリ塩化ビニル１００質量部、ＤＯＩＰ５０質量部、およびＣａ／Ｚｎ系安定剤３．０質量部を２本ロールを用いて均一に混練し、プレス機を用いて電線・ケーブル被覆用塩化ビニル樹脂組成物を得た。
Example 1
100 parts by weight of polyvinyl chloride, 50 parts by weight of DOIP, and 3.0 parts by weight of a Ca / Zn stabilizer are uniformly kneaded using two rolls, and a vinyl chloride resin composition for covering electric wires and cables using a press. Got.
実施例２〜１０、比較例１〜６
配合成分および／または配合量を表１および表２に示すように変えた以外は、実施例１と同様にして電線・ケーブル被覆用塩化ビニル樹脂組成物を得た。
Examples 2-10, Comparative Examples 1-6
A vinyl chloride resin composition for covering electric wires and cables was obtained in the same manner as in Example 1 except that the blending components and / or blending amounts were changed as shown in Tables 1 and 2.
上記各実施例および各比較例で得られた電線・ケーブル被覆用塩化ビニル樹脂組成物の各種特性を、下記に示す方法で評価した。
［比重］
ＪＩＳ Ｋ ７１１２（プラスチック‐非発泡プラスチックの密度及び比重の測定方法）に準拠して測定した。
［硬さ］
ＪＩＳ Ｋ ７２１５（プラスチックのデュロメータ硬さ試験方法）に準拠して測定した（荷重負荷時間５秒）。
［体積抵抗率（３０℃、６０℃）、耐寒性、熱安定性］
ＪＩＳ Ｋ ６７２３（軟質ポリ塩化ビニルコンパウンド）に準拠し、３０℃および６０℃における体積抵抗率を測定するとともに、耐寒性および熱安定性の評価を行った。
［100％モジュラス、引張強さ・伸び］
ＪＩＳ Ｋ ６７２３に規定の２号試験片を作成し、標線２５ｍｍ、引張速度２００ｍｍ／ｍｉｎの条件で測定した。
［耐熱老化性］
ＪＩＳ Ｋ ６７２３に準拠し、熱老化（１００℃で１２０時間）後の引張強さ残率および伸び残率を測定した。
［耐油性］
ＪＩＳ Ｋ ６７２３に準拠し、７０℃で４時間、ＪＩＳ Ｃ ２３２０規定の１種２号絶縁油に浸漬後の引張強さ残率および伸び残率を測定した。
［耐ブリード性］
試験用シート（２５ｍｍ×１８０ｍｍ×１ｍｍ）を７０℃の温水および室温の水の上に吊るし、それぞれ１ヶ月後および４ヶ月後、シート表面を目視により観察して、下記の基準で評価した。
◎：良好（ブリードなし）
○：やや良好（ブリードはわずかに認められるものの、実用上問題なし）
△：やや不良（多少のブリードが認められ、実用上問題あり）
×：不良（ブリードあり）
［難燃性］
ＪＩＳ Ｋ ７２０１（酸素指数法による高分子材料の燃焼試験方法）に準拠して測定した。
Various characteristics of the vinyl chloride resin compositions for covering electric wires and cables obtained in the above Examples and Comparative Examples were evaluated by the methods shown below.
[specific gravity]
The measurement was performed according to JIS K 7112 (Plastic—Method for measuring density and specific gravity of non-foamed plastic).
[Hardness]
Measured according to JIS K 7215 (plastic durometer hardness test method) (loading time 5 seconds).
[Volume resistivity (30 ° C, 60 ° C), cold resistance, thermal stability]
Based on JIS K 6723 (soft polyvinyl chloride compound), volume resistivity at 30 ° C. and 60 ° C. was measured, and cold resistance and thermal stability were evaluated.
[100% modulus, tensile strength / elongation]
A No. 2 test piece defined in JIS K 6723 was prepared and measured under conditions of a marked line of 25 mm and a tensile speed of 200 mm / min.
[Heat aging resistance]
Based on JIS K 6723, the tensile strength residual ratio and the elongation residual ratio after heat aging (120 hours at 100 ° C.) were measured.
[Oil resistance]
In accordance with JIS K 6723, the tensile strength residual ratio and elongation residual ratio after immersion in Type 1 No. 2 insulating oil defined in JIS C 2320 were measured at 70 ° C. for 4 hours.
[Bleed resistance]
A test sheet (25 mm × 180 mm × 1 mm) was suspended on 70 ° C. warm water and room temperature water, and after 1 month and 4 months, the sheet surface was visually observed and evaluated according to the following criteria.
A: Good (no bleed)
○: Slightly good (although bleed is slightly observed, there is no practical problem)
Δ: Slightly defective (slight bleed is recognized and practically problematic)
×: Defect (with bleed)
[Flame retardance]
The measurement was performed in accordance with JIS K 7201 (a combustion test method for polymer materials by the oxygen index method).
これらの結果を表１および表２の下欄に示す。 These results are shown in the lower column of Tables 1 and 2.
表１および表２から明らかなように、本発明に係る電線・ケーブル被覆用塩化ビニル樹脂組成物は、従来の可塑剤を用いた比較例に匹敵するか、もしくはそれより良好な特性を有しており、従来の電線・ケーブル被覆材料の代替材料として十分に使用可能であることが確認された。 As is apparent from Tables 1 and 2, the vinyl chloride resin composition for covering electric wires and cables according to the present invention has characteristics comparable to or better than those of comparative examples using conventional plasticizers. It has been confirmed that it can be used satisfactorily as an alternative to conventional wire and cable coating materials.
Claims (1)
前記（Ｂ）イソフタル酸エステル系可塑剤が、イソフタル酸ジ（２−エチルヘキシル）および／またはイソフタル酸ジイソノニルであることを特徴とする電線・ケーブル被覆用塩化ビニル樹脂組成物。 (A) A polyvinyl chloride resin composition containing (B) 10 to 120 parts by mass of an isophthalic acid ester plasticizer and (C) 1 to 10 parts by mass of a stabilizer for 100 parts by mass of polyvinyl chloride,
The vinyl chloride resin composition for covering electric wires and cables, wherein the (B) isophthalic ester plasticizer is di (2-ethylhexyl) isophthalate and / or diisononyl isophthalate.
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