JPS58184206A - Wire and cable - Google Patents
Wire and cableInfo
- Publication number
- JPS58184206A JPS58184206A JP57066999A JP6699982A JPS58184206A JP S58184206 A JPS58184206 A JP S58184206A JP 57066999 A JP57066999 A JP 57066999A JP 6699982 A JP6699982 A JP 6699982A JP S58184206 A JPS58184206 A JP S58184206A
- Authority
- JP
- Japan
- Prior art keywords
- polyethylene
- cable
- insulating composition
- conductor
- water
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Landscapes
- Organic Insulating Materials (AREA)
- Insulated Conductors (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は、架橋ポリエチレン絶縁電線、ケーブルの改良
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in crosslinked polyethylene insulated wires and cables.
架橋ポリエチレンけ、絶縁性や耐熱性にすぐれた特徴を
もっているところから、電線、ケーブルの絶縁体として
多く用いられている。 −しかし、近年、浸水状態で
課電を行った場合、水トリーが発生し、電気的な劣化が
進行することが認めちれている。そして、今後も架橋ポ
リエチレンケーブルは地中埋設など浸水環境下における
使用が進むことになるので、この水トリーを抑制するこ
とが重要な問題となっている。Cross-linked polyethylene is often used as an insulator for electric wires and cables due to its excellent insulation and heat resistance properties. -However, in recent years, it has been recognized that when electricity is applied in a flooded state, water trees occur and electrical deterioration progresses. Since cross-linked polyethylene cables will continue to be used in flooded environments, such as when buried underground, suppressing this water tree has become an important issue.
この問題については、既に各方面で種々と研究がなされ
ており、その対策として、例えば(1)エチレンビニル
アセテートコポリマを単独あるいはブレンドして用いる
方法、(2)特殊な酸化防止剤やエステル基含有添加剤
を添加する方法々どが提案されている。しかし、(1)
では、水トリー抑止効果を上げるためビニルアセテート
含有量を多くすると電気的特性が低下する問題がある。Various studies have already been conducted on this problem in various fields, and as countermeasures, for example, (1) methods using ethylene vinyl acetate copolymers alone or in combination, (2) methods containing special antioxidants or ester groups. Various methods of adding additives have been proposed. However, (1)
However, if the vinyl acetate content is increased in order to increase the water tree inhibiting effect, there is a problem in that the electrical characteristics deteriorate.
また、(2)では水トリー発生を抑止する効果が十分と
言える程すぐれているものではなかった。In addition, (2) was not so good that it could be said that the effect of inhibiting water tree generation was sufficient.
本発明は上記の状況に鑑みなされたものであり、導体を
被覆する絶縁組成物内における水トリーの発生個数を抑
制でき絶縁組成物の絶縁劣化の進行を阻止できる電線、
ケーブルを提供することを目的としたものである。The present invention was made in view of the above situation, and provides an electric wire that can suppress the number of water trees that occur in an insulating composition that coats a conductor and prevent the progress of insulation deterioration of the insulating composition.
The purpose is to provide cables.
本発明の電線、ケーブルは、導体上に、高圧法で製造し
密度(1/cd )が0.925〜0.935の範囲か
らなりメルトインデックスが0.5以上のポリエチレン
を主体とする混和物の架橋体の絶縁組成物が被覆されて
なるものである。The electric wires and cables of the present invention include a mixture mainly made of polyethylene, which is produced by a high-pressure method, has a density (1/cd) in the range of 0.925 to 0.935, and has a melt index of 0.5 or more on a conductor. It is coated with a crosslinked insulating composition.
以下本発明の電線、ケーブルの一実施例を説明する。本
実施例の電線、ケーブルの絶縁組成物を製造する高圧法
とは、従来低密度ポリエチレンを製造するのに用いてき
た方法であり、数千気圧下で、有機過酸化物を用いてラ
ジカル反応でエチレンを重合する方法である。また、密
度(97crJ )を、0、925〜0.935の範囲
に限定したのは、この値以下では水トリーの発生抑止効
果がなく、この値以上のものは実際上合成が困難である
ためである。そして、メルトインデックスを05以上と
限定した理由は、0.5以下では押出成形、特に有機過
酸化物を添加して押し出しする場合にスコーチを発生し
、押し出しが円滑にできないためであり、上限は特に限
定しないが、あまり大きくすると架橋度の低下などが起
るため、せいぜい10位が望ましい。
1
ここで言う架橋とは、ジクミルパーオキサイドに代表さ
れる有機過酸化物を添加して押出し後加熱する方式が最
も代表的である。これ以外にも電子線のような放射線を
照射して行なう架橋、あるいは′最近某社によって開発
されたもので、加水分解し得る有機基を持つシラン化合
物を有機過酸化物でポリエチレンにグラフトし、その後
シラノール縮合触媒の存在下で水にさらすことによって
行なう架橋でも支障がない。なお、適宜、酸化防止剤、
滑剤などの配合剤を添加することは可能である。さらに
、水トリーを防止する配合剤、例えば、極性基を有する
ポリマをブレンドしたり、エステル基含有添加剤を添加
することにより一段と水トリー防止性を向上できる。An embodiment of the electric wire and cable of the present invention will be described below. The high-pressure method used to produce the insulating composition for electric wires and cables in this example is a method conventionally used to produce low-density polyethylene, and involves a radical reaction using an organic peroxide under several thousand atmospheric pressures. This is a method of polymerizing ethylene. In addition, the density (97crJ) was limited to the range of 0.925 to 0.935 because below this value there is no effect of inhibiting the occurrence of water tree, and above this value it is practically difficult to synthesize. It is. The reason why the melt index is limited to 05 or more is that if it is less than 0.5, scorch will occur during extrusion molding, especially when extruding with the addition of organic peroxide, making it impossible to extrude smoothly. Although not particularly limited, if the number is too large, the degree of crosslinking may decrease, so it is desirable that the number is at most 10.
1 The most typical crosslinking mentioned here is a method of adding an organic peroxide such as dicumyl peroxide and heating after extrusion. In addition to this, crosslinking is carried out by irradiating radiation such as electron beams, or 'recently developed by a certain company, in which a silane compound with a hydrolyzable organic group is grafted onto polyethylene using an organic peroxide, and then There is no problem in crosslinking carried out by exposure to water in the presence of a silanol condensation catalyst. In addition, antioxidant,
It is possible to add compounding agents such as lubricants. Further, the water tree prevention property can be further improved by blending a compounding agent that prevents water tree, for example, a polymer having a polar group or adding an ester group-containing additive.
次に本実施例の電線、ケーブルを、3個の絶縁組成物の
試料を作成し2個の比較例の絶縁組成物と対比して説明
する。これら絶縁物の評価は、押出し後加熱架橋して製
造した図に示すようなモデルケーブルを作成して行りた
。図において、1は1゜
導体、3社絶縁組成物′で導体1の外周に半導電層2を
介在し被覆されており、半導電層2の外径は41111
1絶縁組成物3の外径は8mmである。絶縁組成物3は
、ポリエチレ7100、ジクミルパーオキサイド25及
び4,4′−チオビス(6−ターシャリブチル−3−メ
チルフェノール)0.2の材料を用いて第1表に示すポ
リエチレン製造法、密度及びメルトインデックスにて製
造した。但し、実施例3のみはステアリン酸鉛を0.2
添加した。Next, the electric wire and cable of this example will be explained by making three samples of insulating compositions and comparing them with two comparative examples of insulating compositions. Evaluation of these insulators was carried out by creating a model cable as shown in the figure, which was produced by heating and crosslinking after extrusion. In the figure, 1 is a 1° conductor, and the outer periphery of the conductor 1 is coated with a semiconductive layer 2 with an insulating composition from a third company, and the outer diameter of the semiconductive layer 2 is 41111.
1. The outer diameter of the insulation composition 3 is 8 mm. Insulating composition 3 was prepared using the polyethylene manufacturing method shown in Table 1 using polyethylene 7100, dicumyl peroxide 25, and 4,4'-thiobis(6-tert-butyl-3-methylphenol) 0.2, Manufactured based on density and melt index. However, only in Example 3, lead stearate was added to 0.2
Added.
第1表
試験法は、図のモデルケーブルを水中に浸漬し、50H
z、3KVを18ケ月課電する試験条件を用い、第2表
に示す試験結果が得られた。The test method in Table 1 is to immerse the model cable shown in the figure in water for 50 hours.
The test results shown in Table 2 were obtained using test conditions in which 3 KV was applied for 18 months.
第2表
第2表で明らかな如〈実施例1.2.3の水トリー発生
抑止効果は著しい。そして、高圧法で製造しても、密度
が0.920と小さい比較例1及び4−グラ、ナツタ系
の触媒を用諭−て合成する低圧法によって得られた中密
度ポリエチレンである比較例2はいずれも水トリーが著
しく発生している。As is clear from Table 2, the effect of inhibiting the occurrence of water trees in Examples 1, 2, and 3 is remarkable. Comparative Example 1 and Comparative Example 2, which are medium-density polyethylene obtained by a low-pressure method synthesized using a GRA and Natsuta catalyst, have a density as low as 0.920 even when manufactured by a high-pressure method. In both cases, water trees occur significantly.
このように本実施例の電線、ケーブルは絶縁組成物のポ
リエチレン自体に焦点を当てて水トリーとポリエチレン
の分子構造との関連性を追求し、高圧法で製造するとと
もに密度を0.925〜0.935、メルトインデック
スが065以上の範囲にあるポリエチレン架橋した絶縁
材料を導体に被覆したことにより、水トリーの発生個数
を著しく抑制し絶縁被覆の電気的劣化の進行を防止でき
る。尚、混和物の絶縁組成物のポリエチレン100重量
部に対し、脂肪酸金属塩を少なくとも0.02 p h
r以上添加することにより更に水トリーの発生を抑制
できる。In this way, the electric wires and cables of this example were manufactured by a high-pressure method, focusing on the polyethylene itself of the insulating composition, and pursuing the relationship between the water tree and the molecular structure of polyethylene. By coating the conductor with a polyethylene cross-linked insulating material having a melt index of 0.935 and 0.935 or more, the number of water tree occurrences can be significantly suppressed and electrical deterioration of the insulating coating can be prevented from progressing. In addition, at least 0.02 p h of fatty acid metal salt is added to 100 parts by weight of polyethylene in the insulating composition of the mixture.
By adding r or more, the occurrence of water trees can be further suppressed.
以上記述したように本発明の電線、ケーブルは、導体を
被覆する絶縁組成物内における水トリーの発生個数を著
しく抑制できて絶縁組成物の絶縁劣化の進行を阻止する
ことができる効果を有するものである。As described above, the electric wires and cables of the present invention have the effect of significantly suppressing the number of water trees that occur in the insulating composition that coats the conductor and preventing the progress of insulation deterioration of the insulating composition. It is.
図は本発明の電線、ケーブルの実施例のモデルケーブル
の横断面図である。
1・・・・・・導体、 2・・・・・・半導電
層、3・・・・・・絶縁組成物。
1ζ
29−The figure is a cross-sectional view of a model cable of an embodiment of the electric wire and cable of the present invention. 1... Conductor, 2... Semiconductive layer, 3... Insulating composition. 1ζ 29-
Claims (1)
)が0、925〜0゜935の範囲からなりメルトイ
ンテックスが0.5以上のポリエチレンを主体とする混
和物の架橋体からなる絶縁組成物が被覆されてなること
を特徴とする電線、ケーブル。(1) The density (g/cra) is manufactured using a high pressure method on a conductor.
) is in the range of 0.925 to 0.935 degrees and the melt intex is 0.5 or more. An electric wire or cable coated with an insulating composition made of a crosslinked mixture of polyethylene as a main component.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57066999A JPS58184206A (en) | 1982-04-21 | 1982-04-21 | Wire and cable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57066999A JPS58184206A (en) | 1982-04-21 | 1982-04-21 | Wire and cable |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS58184206A true JPS58184206A (en) | 1983-10-27 |
JPH035004B2 JPH035004B2 (en) | 1991-01-24 |
Family
ID=13332207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57066999A Granted JPS58184206A (en) | 1982-04-21 | 1982-04-21 | Wire and cable |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58184206A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60198006A (en) * | 1984-03-21 | 1985-10-07 | 日立電線株式会社 | Method of producing wire and cable |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5070881A (en) * | 1973-10-29 | 1975-06-12 |
-
1982
- 1982-04-21 JP JP57066999A patent/JPS58184206A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5070881A (en) * | 1973-10-29 | 1975-06-12 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60198006A (en) * | 1984-03-21 | 1985-10-07 | 日立電線株式会社 | Method of producing wire and cable |
JPH0452563B2 (en) * | 1984-03-21 | 1992-08-24 | Hitachi Cable |
Also Published As
Publication number | Publication date |
---|---|
JPH035004B2 (en) | 1991-01-24 |
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