JPH05258612A - Electric insulator for electric wire/cable - Google Patents
Electric insulator for electric wire/cableInfo
- Publication number
- JPH05258612A JPH05258612A JP4050722A JP5072292A JPH05258612A JP H05258612 A JPH05258612 A JP H05258612A JP 4050722 A JP4050722 A JP 4050722A JP 5072292 A JP5072292 A JP 5072292A JP H05258612 A JPH05258612 A JP H05258612A
- Authority
- JP
- Japan
- Prior art keywords
- insulator
- electric
- cable
- polyethylene
- 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.)
- Pending
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
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
- Insulated Conductors (AREA)
Abstract
Description
【０００１】[0001]
【発明の対象】この発明は、架橋ポリエチレン絶縁電力
ケーブル等の絶縁体内に発生する水トリー、特にボウタ
イトリーの発生を大幅に抑止することのできる電気絶縁
物に関するものである。OBJECT OF THE INVENTION The present invention relates to an electrical insulator capable of significantly suppressing the generation of water trees, especially bow tie tree, generated in an insulator such as a cross-linked polyethylene insulated power cable.
【０００２】[0002]
【従来の技術】架橋ポリエチレンは高度の電気絶縁性を
有することから、電線・ケーブル用電気絶縁体として多
く使用されている。2. Description of the Related Art Crosslinked polyethylene has a high degree of electrical insulation and is therefore widely used as an electrical insulator for electric wires and cables.
【０００３】しかし、架橋ポリエチレン絶縁電線・ケー
ブルを湿潤な環境下で使用すると、水トリーと呼ばれる
電気化学的劣化が発生し、電気絶縁性能が著しく低下す
る。このために、その発生の抑止については架橋ポリエ
チレン絶縁電線・ケーブルが本格的な実用化を見るに至
って以来、長年の課題とされていた。However, when the crosslinked polyethylene insulated electric wire / cable is used in a humid environment, electrochemical deterioration called water tree occurs, and the electrical insulation performance is significantly deteriorated. For this reason, it has been a long-standing challenge to prevent the occurrence of crosslinked polyethylene insulated wires / cables since they came into full-scale practical use.
【０００４】数多くの基礎的あるいは実課電での研究の
結果、水トリーは次のような機構により発生すると考え
られている。架橋ポリエチレン絶縁体中のボイド，異
物，並びに絶縁体と半導電層界面の異物や突起等に水が
凝集すると、非極性の架橋ポリエチレンは水との親和性
が低いため、凝集した水の圧力上昇によってその周辺に
力学的ひずみを生じ、水トリーの発生に至る。As a result of numerous studies on basic or actual charging, it is considered that the water tree is generated by the following mechanism. When water agglomerates on voids, foreign substances in the cross-linked polyethylene insulator, and foreign substances and protrusions on the interface between the insulator and the semi-conductive layer, the non-polar cross-linked polyethylene has a low affinity for water and the pressure of the agglomerated water increases. Causes mechanical strain around it, leading to the generation of water trees.
【０００５】水トリーの発生を防止するために、レジン
の細心にわたる品質管理や製造ラインのクリーンルーム
化等の電線・ケーブル製造技術の改善、あるいは絶縁体
中への極性基の導入による親水性の向上などの手段が講
じられ、水トリーの発生は着実に抑止されつつある。In order to prevent the generation of water trees, meticulous quality control of the resin, improvement of electric wire / cable manufacturing technology such as making the manufacturing line a clean room, or improvement of hydrophilicity by introducing polar groups into the insulator. By taking such measures, the occurrence of water trees is being steadily suppressed.
【０００６】しかしながら、前記の各方面にわたる努力
が重ねられているにもかかわらず、今日の技術では水ト
リーの発生を皆無にできる段階までには至っていない。
このため、鋭意その発生の抑止対策についての検討が進
められているのが実情である。However, in spite of the efforts in the above-mentioned various fields, the technology of today has not reached the stage where the generation of water trees can be completely eliminated.
For this reason, the fact is that studies are being conducted earnestly on measures to prevent such occurrence.
【０００７】[0007]
【発明の目的】本発明はこのような実情に鑑みてなされ
たもので、絶縁体中にボイド，異物並びに絶縁体と半導
電層との界面における不整といった欠陥が不可避的に存
在していても、水トリーの発生を大幅に抑止できる新規
の電線・ケーブル用電気絶縁体を提供することを目的と
する。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and even if defects such as voids, foreign matters, and irregularities at the interface between the insulator and the semiconductive layer are unavoidably present in the insulator. An object of the present invention is to provide a new electric insulator for electric wires / cables, which can significantly suppress the generation of water trees.
【０００８】[0008]
【発明の要点】この発明は、ポリエチレンまたはエチレ
ン系共重合体、あるいはこれらの混合物１００重量部に
対し、次式The present invention relates to the following formula based on 100 parts by weight of polyethylene or ethylene-based copolymer, or a mixture thereof.
【０００９】[0009]
【数１】 [Equation 1]
【００１０】（ここで、Ｒ1 ，Ｒ2 ，Ｒ3 ，Ｒ4 ，
Ｒ5 ，Ｒ6 の合計炭素数は８個以上で、Ｒ1 ，Ｒ2 は水
素、またはフェニル基並びに置換フェニル基を除く炭化
水素基の中から選ばれる。なお、Ｒ1 ，Ｒ2 ，Ｒ3 ，Ｒ
4 ，Ｒ5 ，Ｒ6 の構造中には一部酸素，窒素，硫黄，硅
素等の原子、またはこれらからなる原子団が入っても支
障はない。）を有するアミノシランを０．００５〜１．
０重量部添加してなる組成物を、架橋処理してなること
を特徴とするもので、耐水トリー性、特に耐ボウタイト
リー性を大幅に向上させたものである。(Where R 1 , R 2 , R 3 , R 4 ,
The total carbon number of R 5 and R 6 is 8 or more, and R 1 and R 2 are selected from hydrogen or a hydrocarbon group excluding a phenyl group and a substituted phenyl group. In addition, R 1 , R 2 , R 3 , R
There is no problem even if some atoms such as oxygen, nitrogen, sulfur and silicon, or atomic groups consisting of these atoms are included in the structure of 4 , R 5 and R 6 . 0.005 to 1.
A composition obtained by adding 0 part by weight of the composition is subjected to a cross-linking treatment, and the water tree resistance, particularly the bowtley resistance, is greatly improved.
【００１１】ここで、Ｒ1 ，Ｒ2 にフェニル基並びに置
換フェニル基を導入した化合物を除外したのは、これら
の化合物はアミノ基の効果が弱く、十分なボウタイトリ
ー発生抑止効果が得られないからである。Compounds in which a phenyl group and a substituted phenyl group have been introduced into R 1 and R 2 are excluded here because these compounds have a weak effect of an amino group and a sufficient effect of suppressing the occurrence of boutite trie cannot be obtained. Because.
【００１２】また、合計炭素数を８個以上としたのは、
８個未満ではポリエチレンまたはエチレン系共重合体、
あるいはこれらの混合物との相溶性が低く、表面に析出
してしまうからである。なお、総炭素数の上限は特に規
定しないが、５０個程度までが望ましい。The reason why the total carbon number is 8 or more is that
If less than 8, polyethylene or ethylene-based copolymer,
Alternatively, it has a low compatibility with these mixtures and precipitates on the surface. The upper limit of the total number of carbons is not particularly specified, but it is desirable to set it to about 50.
【００１３】さらに添加量を０．００５重量部〜１．０
重量部としたのは、これらの添加量が０．００５重量部
未満では、目的とするボウタイトリー発生抑止効果が不
十分であり、１．０重量部を越えると相溶性の上限から
絶縁体表面に析出し（この現象をブルームという）、製
品の品質を低下させてしまうからである。Further, the addition amount is 0.005 parts by weight to 1.0.
If the amount of these components added is less than 0.005 parts by weight, the desired effect of suppressing the formation of boutite trie is insufficient. This is because it is deposited on the surface (this phenomenon is called bloom) and the quality of the product is deteriorated.
【００１４】上記シランの具体例として、Ｎ−（２−ア
ミノエチル）−３−アミノプロピルトリメトキシシラ
ン，Ｎ−（２−アミノエチル）−３−アミノプロピルメ
チルジメトキシシラン，３−アミノプロピルトリエトキ
シシラン等が挙げられる。また、これらの化合物を数種
組み合わせて使用してもよい。Specific examples of the silane include N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane and 3-aminopropyltriethoxy. Examples include silane. Moreover, you may use these compounds in combination of several types.
【００１５】ベースレジンとしては、低密度ポリエチレ
ン，中密度ポリエチレンおよびエチレン−プロピレン共
重合体，エチレン−エチルアクリレート共重合体，エチ
レン−酢酸ビニル共重合体等エチレンを過半に含むポリ
オレフィンが該当する。これらのうち１種、または２種
以上を組み合わせて用いてもよい。Suitable base resins include polyolefins containing ethylene in the majority, such as low density polyethylene, medium density polyethylene and ethylene-propylene copolymers, ethylene-ethyl acrylate copolymers, ethylene-vinyl acetate copolymers. You may use it combining these 1 type (s) or 2 or more types.
【００１６】架橋剤としては、通常使用されるジクミル
パーオキサイド，１，３−ビス−（ターシャリーブチル
パーオキシ−イソプロピル）ベンゼン，２，５−ジメチ
ル−２，５−ジ−（ターシャリーブチルパーオキシ）−
ヘキシン−３等が挙げられる。As the cross-linking agent, dicumyl peroxide, 1,3-bis- (tert-butylperoxy-isopropyl) benzene, 2,5-dimethyl-2,5-di- (tert-butyl) which is usually used is used. Peroxy)-
Hexin-3 and the like can be mentioned.
【００１７】架橋法としては、有機過酸化物による化学
架橋の他に、シラン水架橋や電離性放射線によるものが
ある。Crosslinking methods include chemical crosslinking with organic peroxides, silane water crosslinking, and ionizing radiation.
【００１８】その他必要によっては、滑剤，着色剤，充
填剤，架橋促進剤等を添加することは一向に差し支えな
い。In addition, if necessary, a lubricant, a colorant, a filler, a crosslinking accelerator, etc. may be added.
【００１９】なお、ボウタイトリーに及ぼす水分の影響
は極めて大きく、気中で課電したケーブルや金属シース
等で遮水したケーブルにもボウタイトリーが見いだされ
る。これらは外部から浸透した水分によるものではな
く、ケーブル製造時に架橋ポリエチレンの内部に含まれ
る微量の水分によるものであると考えられる。このよう
なボウタイトリーに対しても、本発明に係る絶縁体が有
効なトリー抑止効果を発揮することはいうまでもない。The influence of water on the bow tie tree is extremely large, and the vault tie tree is also found in a cable charged in the air or a cable shielded by a metal sheath. It is considered that these are not due to the water permeated from the outside, but due to a small amount of water contained in the cross-linked polyethylene at the time of manufacturing the cable. It is needless to say that the insulator according to the present invention also exerts an effective tree suppressing effect on such a bowtie tree.
【００２０】[0020]
【発明の実施例】以下に本発明についての各実施例およ
び比較例を参照し説明する。Examples of the present invention will be described below with reference to Examples and Comparative Examples.
【００２１】表１にそれぞれ示したような配合の電線・
ケーブル用電気絶縁体を調整した。Electric wires having the compositions shown in Table 1
Adjusted electrical insulation for cables.
【００２２】[0022]
【表１】 [Table 1]
【００２３】表１に示す配合成分からなる組成物を、１
２０℃に加熱した熱ロールによって混練し、シート状と
したものをペレタイザを用いてペレット化した。A composition comprising the ingredients shown in Table 1 was added to 1
The mixture was kneaded with a hot roll heated to 20 ° C. and formed into a sheet, which was then pelletized using a pelletizer.
【００２４】これを外径３ｍｍの導体上に、ポリエチレ
ン径半導電層の厚さが０．５ｍｍ，絶縁体の厚さが２ｍ
ｍとなるように同時押出法により押出被覆した。続いて
加熱媒体として窒素ガスを用いた乾式架橋法により、架
橋管内で連続架橋を行った後加圧冷却して絶縁体を得
た。On a conductor having an outer diameter of 3 mm, a polyethylene diameter semi-conductive layer having a thickness of 0.5 mm and an insulator having a thickness of 2 m.
Extrusion coating was carried out by the coextrusion method so as to obtain m. Then, by a dry crosslinking method using nitrogen gas as a heating medium, continuous crosslinking was carried out in a crosslinking tube, followed by pressure cooling to obtain an insulator.
【００２５】ボウタイトリー発生数の評価については、
上記の方法により作製した電線を９０℃の温水中に浸漬
し、導体と水との間に５０Ｈｚ，３ｋＶの交流電圧を５
００日間印加した後、絶縁体を薄くスライスしてメチレ
ンブルー水溶液で煮沸染色し、光学顕微鏡を用いてボウ
タイトリー発生の有無とその個数を計数した。Regarding the evaluation of the number of occurrences of bow tie tree,
The electric wire produced by the above method is immersed in warm water of 90 ° C., and an alternating voltage of 50 Hz and 3 kV is applied between the conductor and water for 5 hours.
After applying for 00 days, the insulator was sliced into thin pieces, boiled and stained with an aqueous solution of methylene blue, and the presence or absence of occurrence of votitley and the number thereof were counted using an optical microscope.
【００２６】ブルームの有無については、電線を作製す
る前のペレットを８０℃の恒温槽内に１０日間に保持し
た後、その表面を観察することにより目視によって評価
した。The presence or absence of bloom was visually evaluated by observing the surface of the pellets, which had not been prepared yet, in a thermostat at 80 ° C. for 10 days.
【００２７】表１は、本発明に係る実施例１〜６、およ
び比較例１〜４について、各供試素材の組成および評価
結果を示したものである。表１から明らかなように、本
発明に係る添加剤を本発明に規定する量だけ添加した実
施例１〜６は、ボウタイトリーの発生が十分抑止されて
いるとともに、ブルームの発生も認められなかった。Table 1 shows the composition and evaluation result of each test material for Examples 1 to 6 and Comparative Examples 1 to 4 according to the present invention. As is clear from Table 1, in Examples 1 to 6 in which the additive according to the present invention was added only in the amount specified in the present invention, the occurrence of bowtitley was sufficiently suppressed, and the occurrence of bloom was not observed. It was
【００２８】これに対し、上記添加剤を添加しないもの
（比較例１）、および本発明の規定から除外したアミノ
基にフェニル基を持つ化合物を添加したもの（比較例
２）はボウタイトリーの発生数が非常に多かった。ま
た、本発明に係る添加剤の添加量が規定量未満のもの
（比較例３）はボウタイトリーが多く発生し、規定の添
加量を越えたもの（比較例４）はブルームが見られた。On the other hand, the one in which the above-mentioned additive was not added (Comparative Example 1) and the one in which a compound having a phenyl group on the amino group excluded from the definition of the present invention (Comparative Example 2) was generated The number was very large. Further, when the amount of the additive according to the present invention added was less than the specified amount (Comparative Example 3), a large amount of votitley occurred, and when it exceeded the specified amount (Comparative Example 4), bloom was observed.
【００２９】[0029]
【発明の効果】以上説明したように、本発明によって、
絶縁体中のボイドや異物、並びに絶縁体と半導電層界面
の不整といった欠陥が存在していたとしてもボウタイト
リーの発生を十分抑止することができ、かつブルームの
生じない絶縁体を入手することが可能になる。As described above, according to the present invention,
Even if there are defects such as voids and foreign matter in the insulator, and irregularities at the interface between the insulator and the semiconductive layer, it is possible to obtain an insulator that can sufficiently suppress the occurrence of bowtie tree and does not cause blooming. Will be possible.
Claims (1)
あるいはこれらの混合物１００重量部に対し、次式 【数１】 （ここで、Ｒ1 ，Ｒ2 ，Ｒ3 ，Ｒ4 ，Ｒ5 ，Ｒ6 の合計
炭素数は８個以上で、Ｒ1 ，Ｒ2 は水素、またはフェニ
ル基並びに置換フェニル基を除く炭化水素基の中から選
ばれる。なお、Ｒ1 ，Ｒ2 ，Ｒ3 ，Ｒ4 ，Ｒ5 ，Ｒ6 の
構造中には一部酸素，窒素，硫黄，硅素等の原子、また
はこれらからなる原子団が入っても支障はない。）を有
するアミノシランを０．００５〜１．０重量部添加して
なる組成物を、架橋処理してなることを特徴とする電線
・ケーブル用電気絶縁物。1. A polyethylene or ethylene-based copolymer,
Alternatively, for 100 parts by weight of these mixtures, the following formula (Here, the total number of carbon atoms of R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 is 8 or more, and R 1 and R 2 are hydrogen or hydrocarbons excluding phenyl group and substituted phenyl group. In the structure of R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 , atoms such as oxygen, nitrogen, sulfur, and silicon, or an atomic group consisting of these atoms are selected. The present invention is an electric insulator for electric wires / cables, which is obtained by subjecting a composition obtained by adding 0.005 to 1.0 part by weight of aminosilane having a) to a crosslinking treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4050722A JPH05258612A (en) | 1992-03-09 | 1992-03-09 | Electric insulator for electric wire/cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4050722A JPH05258612A (en) | 1992-03-09 | 1992-03-09 | Electric insulator for electric wire/cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05258612A true JPH05258612A (en) | 1993-10-08 |
Family
ID=12866767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4050722A Pending JPH05258612A (en) | 1992-03-09 | 1992-03-09 | Electric insulator for electric wire/cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05258612A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007273277A (en) * | 2006-03-31 | 2007-10-18 | Furukawa Electric Co Ltd:The | Cable, and deterioration prevention method of cable |
| WO2022087959A1 (en) * | 2020-10-29 | 2022-05-05 | Dow Global Technologies Llc | Polyaminosiloxane water tree repellant for electrical insulation |
| WO2022087958A1 (en) * | 2020-10-29 | 2022-05-05 | Dow Global Technologies Llc | Polyaminosiloxane water tree repellant for electrical insulation |
-
1992
- 1992-03-09 JP JP4050722A patent/JPH05258612A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007273277A (en) * | 2006-03-31 | 2007-10-18 | Furukawa Electric Co Ltd:The | Cable, and deterioration prevention method of cable |
| WO2022087959A1 (en) * | 2020-10-29 | 2022-05-05 | Dow Global Technologies Llc | Polyaminosiloxane water tree repellant for electrical insulation |
| WO2022087958A1 (en) * | 2020-10-29 | 2022-05-05 | Dow Global Technologies Llc | Polyaminosiloxane water tree repellant for electrical insulation |
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