JPH0564402B2 - - Google Patents
Info
- Publication number
- JPH0564402B2 JPH0564402B2 JP60024208A JP2420885A JPH0564402B2 JP H0564402 B2 JPH0564402 B2 JP H0564402B2 JP 60024208 A JP60024208 A JP 60024208A JP 2420885 A JP2420885 A JP 2420885A JP H0564402 B2 JPH0564402 B2 JP H0564402B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- eva
- composition
- ethylene
- 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.)
- Expired - Lifetime
Links
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 14
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 13
- 150000001451 organic peroxides Chemical class 0.000 claims description 7
- 229920002367 Polyisobutene Polymers 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 5
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 1
- 239000011342 resin composition Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 14
- 238000004132 cross linking Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000011243 crosslinked material Substances 0.000 description 1
- -1 crosslinking aids Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Description
［技術分野］
本発明は絶縁電線に関し、更に詳しくはエチレ
ン−酢酸ビニル共重合体を主成分とする架橋体に
より被覆されてなる絶縁電線に関する。
［従来技術］
エチレン系重合体就中エチレン−酢酸ビニル共
重合体（以下EVAという）は優れた電気絶縁性
を有し、また放射線架橋、有機過酸化物架橋、シ
ラン化合物を用いるシラン架橋等各種の架橋手段
を適宜に採用して架橋出来、惹いては各種物性を
改善出来利点があるため、従来から電気絶縁材料
を始め、各種の分野にはば広く使用されて来た。
しかしながらこのような利点を有するEVAに於
いても、ゴムと比較した場合可撓性に欠け硬すぎ
るという難点がある。この難点はこのEVAを口
出線等の絶縁電線用被覆材として使用する場合に
特に問題となる。又この難点改良のためEVAと
エラストマー特にエチレンプロピレン共重合体
（以下EPMという）とブレンドすることが試みら
れているが、押出加工性特に外観が出ないという
問題がある。
［発明の目的並びにその概要］
本発明者は従来からEVAを有する上記難点に
注目し、可撓性の優れた架橋物を与えうるEVA
組成物惹いてこの組成物により被覆された絶縁電
線を開発すべく鋭意研究を続けて来たが、この研
究に於いて、特に第３級炭素原子を有する高分子
物質という特定のポリマー特にポリイソブチレン
を特定量EVAに配合するときは、かなりの可撓
性が得られることを見出した。またこの研究に於
いてEVAと上記特定の第３級炭素原子を有する
ポリマー就中ポリイソブチレンと含有する本発明
組成物に、EPMを特定量配合すれば更に好まし
い可撓性が得られ、且つ従来問題とされていた押
出外観が著しく改善されるという全く新しい効果
が発揮されることを見出した。
これ等の新しい知見に基づき、更に研究を続
け、上記の新しい組成物について実際にこれを絶
縁電線の被覆材として使用した場合に、絶縁電線
の寿命特性として通常要求される基本的な３つの
要件即ち、伸び、抗張力及び電気絶縁破壊電圧の
３つの要件を満足するか否かを調査した。
この結果、新しい知見に基づく上記新しい組成
物は、上記３つの要件をいずれも満足するもので
あることも判明した。
本発明はこれ等の新しい事実に基づいて完成さ
れたもので、即ち本発明は酢酸ビニル含有量が５
〜15重量％のプラスチツク状エチルン−酢酸ビニ
ル共重合体100重量部、ポリイソブチレン１〜20
重量部、エチレン−プロピレン共重合体40〜100
重量部及び有機過酸化物が少なくとも１重量部か
ら成る組成物の架橋体を被覆材として使用した絶
縁電線に係るものである。
［発明の効果］
本発明に於いては、上記組成物を架橋し、これ
を被覆材として使用すると、可撓性に極めて優
れ、且つ押出外観が著しく改善された被覆層を有
する絶縁電線が得られる。
［発明の構成］
本発明に於いて使用される組成物は、EVA100
重量部、ポリイソブチレン１〜20重量部好ましく
は５〜15重量部、エチレン−プロピレン共重合体
40〜100重量部及び有機過酸化物が少なくとも１
重量部を含有して成る組成物である。この際使用
されるEVAとしは、その酢酸ビニル含量が５〜
15重量％好ましくは７〜12重量部であり、そのメ
ルトインデツクスが0.5〜２のものが使用される。
またポリイソブチレンは通常平均分子量
（Stauding法による）80000〜100000程度のもの
であつて、40〜100重量部配合される。
また本発明に於いて使用されるEPMは、
EVA100重量部に対し40〜100重量部程度であり、
またEPMのプロピレンの含有量は15〜70モル％
程度で、ムーニー粘度ML1+4（100℃）は15〜100
程度のものである。
本発明組成物には更に必要に応じて通常の各種
添加剤を添加することが出来る。こ際の他の添加
剤としては、たとえば難燃剤、充填剤、酸化防止
剤、加工助剤、架橋助剤、表面処理剤等を例示す
ることが出来る。
本発明組成物はこれを架橋して使用されるのを
通常とするが、この際の架橋手段は有機過酸化物
架橋を用いて架橋する。
以下に実施例を示して本発明をより具体的に説
明する。但し下記例に於いて部とあるは重量部を
示すものとする。
実施例１〜５並びに比較例１〜４
第１表に示す配合割合で各成分を所定量配合し
充分混練して組成物となした。この組成物につい
て下記の条件で有機過酸化物による化学架橋電線
を作り絶縁物の外観と可撓性を測定した。この結
果を第１表に併記する。
＜電線製造方法＞
115mmφカテナリー型連続架橋装置を用いて、
通常の条件で外径1.0mmの導体上に１mm厚の絶縁
体を被覆、架橋を行つた。
＜可撓性と測定方法＞
絶縁体の張張り試験を行い100％モジユラスで
可撓性を測定した。
比較例 ５〜７
第２表を示す配合割合で各成分を配合し、充分
混練した。この組成物について実施例１と同様に
処理した。
実施例１〜５及び比較例５〜７の組成別が絶縁
電線として要求される物性を満足するか否かにつ
いて検討した。この結果を第３表に示す。
[Technical Field] The present invention relates to an insulated wire, and more particularly to an insulated wire coated with a crosslinked material containing an ethylene-vinyl acetate copolymer as a main component. [Prior art] Ethylene polymers, especially ethylene-vinyl acetate copolymers (hereinafter referred to as EVA), have excellent electrical insulation properties, and can be cross-linked by radiation, organic peroxides, silane cross-links using silane compounds, etc. It has been widely used in various fields including electrical insulating materials because it can be cross-linked by appropriately employing cross-linking means, which has the advantage of improving various physical properties.
However, even though EVA has these advantages, it still has the drawbacks of lacking flexibility and being too hard when compared to rubber. This difficulty becomes a particular problem when this EVA is used as a covering material for insulated wires such as lead wires. In order to improve this problem, attempts have been made to blend EVA with an elastomer, particularly an ethylene propylene copolymer (hereinafter referred to as EPM), but there are problems in terms of extrusion processability and poor appearance. [Objective and Summary of the Invention] The present inventor has focused on the above-mentioned drawbacks of EVA, and developed an EVA that can provide a crosslinked product with excellent flexibility.
We have been conducting intensive research to develop insulated wires coated with this composition. It has been found that when a specific amount of EVA is blended with EVA, considerable flexibility can be obtained. In addition, in this study, it was found that if a specific amount of EPM was added to the composition of the present invention containing EVA and the above-mentioned specific polymer having a tertiary carbon atom, particularly polyisobutylene, more preferable flexibility could be obtained. It has been discovered that a completely new effect can be achieved in that the extrusion appearance, which had been a problem, is significantly improved. Based on these new findings, we continued our research to find out the three basic requirements normally required for the life characteristics of insulated wires when the above new composition is actually used as a covering material for insulated wires. That is, it was investigated whether the three requirements of elongation, tensile strength, and electrical breakdown voltage were satisfied. As a result, it was found that the new composition based on the new knowledge satisfies all three requirements. The present invention was completed based on these new facts, that is, the present invention has a vinyl acetate content of 5.
~15% by weight plastic ethylne-vinyl acetate copolymer 100 parts by weight, polyisobutylene 1-20
Parts by weight, ethylene-propylene copolymer 40-100
The invention relates to an insulated wire in which a crosslinked composition comprising at least 1 part by weight of organic peroxide and at least 1 part by weight of an organic peroxide is used as a covering material. [Effects of the Invention] In the present invention, by crosslinking the above composition and using it as a coating material, an insulated wire having a coating layer with extremely excellent flexibility and significantly improved extrusion appearance can be obtained. It will be done. [Structure of the invention] The composition used in the present invention is EVA100
Parts by weight, 1 to 20 parts by weight of polyisobutylene, preferably 5 to 15 parts by weight, ethylene-propylene copolymer
40 to 100 parts by weight and at least 1 part of organic peroxide
The composition comprises parts by weight. The EVA used at this time has a vinyl acetate content of 5 to 5.
15% by weight, preferably 7 to 12 parts by weight, and a melt index of 0.5 to 2 is used.
Polyisobutylene usually has an average molecular weight (according to the Stauding method) of about 80,000 to 100,000, and is blended in an amount of 40 to 100 parts by weight. Furthermore, the EPM used in the present invention is
It is about 40 to 100 parts by weight per 100 parts by weight of EVA,
In addition, the propylene content of EPM is 15 to 70 mol%
Mooney viscosity ML 1+4 (100℃) is 15~100
It is of a certain degree. Various conventional additives can be further added to the composition of the present invention, if necessary. Examples of other additives in this case include flame retardants, fillers, antioxidants, processing aids, crosslinking aids, and surface treatment agents. The composition of the present invention is usually used after crosslinking, and in this case, the crosslinking means is organic peroxide crosslinking. EXAMPLES The present invention will be explained in more detail with reference to Examples below. However, in the following examples, parts refer to parts by weight. Examples 1 to 5 and Comparative Examples 1 to 4 Predetermined amounts of each component were blended in the proportions shown in Table 1 and thoroughly kneaded to form compositions. Chemically crosslinked electric wires were made using organic peroxide using this composition under the following conditions, and the appearance and flexibility of the insulators were measured. The results are also listed in Table 1. <Wire manufacturing method> Using a 115mmφ catenary type continuous crosslinking device,
Under normal conditions, a conductor with an outer diameter of 1.0 mm was coated with a 1 mm thick insulator and crosslinked. <Flexibility and measurement method> An insulator tension test was conducted and flexibility was measured at 100% modulus. Comparative Examples 5 to 7 Each component was blended in the proportions shown in Table 2 and thoroughly kneaded. This composition was treated in the same manner as in Example 1. It was examined whether the compositions of Examples 1 to 5 and Comparative Examples 5 to 7 satisfied the physical properties required for insulated wires. The results are shown in Table 3.
【表】
成ゴム
[Table] Synthetic rubber
【表】【table】
【表】【table】
【表】
○：合格
×：不合格
＜測定方法＞
空気中125℃で４万時間以上加熱したときの
夫々の物性を測定し、下記の条件を満足するも
の。
●伸び：絶対値の50％以下
●抗張力：0.4Kg／mm2以下
●電気絶縁破壊電圧：初期値の50％以下[Table] ○: Pass ×: Fail <Measurement method> Measure the respective physical properties when heated in air at 125°C for 40,000 hours or more, and satisfy the following conditions. ●Elongation: 50% or less of absolute value ●Tensile strength: 0.4Kg/mm 2 or less ●Electrical breakdown voltage: 50% or less of initial value
Claims (1)
ツク状エチレン−酢酸ビニル共重合体100重量部、
ポリイソブチレン１〜20重量部、エチレン−プロ
ピレン共重合体40〜100重量部、及び有機過酸化
物が少なくとも１重量部からなる樹脂組成物の架
橋体により絶縁被覆されてなることを特徴とする
絶縁電線。1 100 parts by weight of a plastic ethylene-vinyl acetate copolymer with a vinyl acetate content of 5 to 15% by weight,
An insulation coated with a crosslinked resin composition comprising 1 to 20 parts by weight of polyisobutylene, 40 to 100 parts by weight of an ethylene-propylene copolymer, and at least 1 part by weight of an organic peroxide. Electrical wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2420885A JPS61183336A (en) | 1985-02-09 | 1985-02-09 | Crosslinkable resin composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2420885A JPS61183336A (en) | 1985-02-09 | 1985-02-09 | Crosslinkable resin composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61183336A JPS61183336A (en) | 1986-08-16 |
| JPH0564402B2 true JPH0564402B2 (en) | 1993-09-14 |
Family
ID=12131883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2420885A Granted JPS61183336A (en) | 1985-02-09 | 1985-02-09 | Crosslinkable resin composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61183336A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52133347A (en) * | 1976-04-30 | 1977-11-08 | Daikyo Gomu Seiko Kk | High molecular products |
| JPS5415953A (en) * | 1977-07-06 | 1979-02-06 | Mitsubishi Chem Ind Ltd | Polyolefin resin composition |
| JPS5455071A (en) * | 1977-10-11 | 1979-05-01 | Asahi Chem Ind Co Ltd | High cold-oriented film and its production |
| JPS5548232A (en) * | 1978-09-01 | 1980-04-05 | D J- K Internatl Kk | Elastic thermoplastic polymer composition |
| JPS5650940A (en) * | 1979-10-01 | 1981-05-08 | Dainippon Ink & Chem Inc | Thermoplastic elastomer composition |
-
1985
- 1985-02-09 JP JP2420885A patent/JPS61183336A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52133347A (en) * | 1976-04-30 | 1977-11-08 | Daikyo Gomu Seiko Kk | High molecular products |
| JPS5415953A (en) * | 1977-07-06 | 1979-02-06 | Mitsubishi Chem Ind Ltd | Polyolefin resin composition |
| JPS5455071A (en) * | 1977-10-11 | 1979-05-01 | Asahi Chem Ind Co Ltd | High cold-oriented film and its production |
| JPS5548232A (en) * | 1978-09-01 | 1980-04-05 | D J- K Internatl Kk | Elastic thermoplastic polymer composition |
| JPS5650940A (en) * | 1979-10-01 | 1981-05-08 | Dainippon Ink & Chem Inc | Thermoplastic elastomer composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61183336A (en) | 1986-08-16 |
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