JPH036250A - Insulating composition and electric cable using the same - Google Patents
Insulating composition and electric cable using the sameInfo
- Publication number
- JPH036250A JPH036250A JP14149889A JP14149889A JPH036250A JP H036250 A JPH036250 A JP H036250A JP 14149889 A JP14149889 A JP 14149889A JP 14149889 A JP14149889 A JP 14149889A JP H036250 A JPH036250 A JP H036250A
- Authority
- JP
- Japan
- Prior art keywords
- water
- acrylic acid
- ethylene
- copolymer
- polyethylene
- 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
- 239000000203 mixture Substances 0.000 title claims abstract description 29
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 claims abstract description 12
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims abstract description 8
- 239000012212 insulator Substances 0.000 claims description 8
- 240000005572 Syzygium cordatum Species 0.000 abstract description 19
- 235000006650 Syzygium cordatum Nutrition 0.000 abstract description 19
- 238000002156 mixing Methods 0.000 abstract description 6
- 239000004698 Polyethylene Substances 0.000 abstract description 5
- -1 polyethylene Polymers 0.000 abstract description 5
- 229920000573 polyethylene Polymers 0.000 abstract description 5
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 abstract description 3
- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical compound CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 229920001577 copolymer Polymers 0.000 abstract 3
- 239000002253 acid Substances 0.000 abstract 2
- 239000004971 Cross linker Substances 0.000 abstract 1
- 239000003963 antioxidant agent Substances 0.000 abstract 1
- 230000003078 antioxidant effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 229920003020 cross-linked polyethylene Polymers 0.000 description 7
- 239000004703 cross-linked polyethylene Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 238000009413 insulation Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 2
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 150000001451 organic peroxides Chemical class 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- XOUQAVYLRNOXDO-UHFFFAOYSA-N 2-tert-butyl-5-methylphenol Chemical compound CC1=CC=C(C(C)(C)C)C(O)=C1 XOUQAVYLRNOXDO-UHFFFAOYSA-N 0.000 description 1
- XEEWCYZEHFVRKU-UHFFFAOYSA-N 3-(3,5-dibutyl-4-hydroxyphenyl)propanoic acid Chemical compound CCCCC1=CC(CCC(O)=O)=CC(CCCC)=C1O XEEWCYZEHFVRKU-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005042 ethylene-ethyl acrylate Substances 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229920001600 hydrophobic polymer Polymers 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、絶縁組成物およびポリエチレン電カケープル
に係り、特に絶縁体の耐水ト・り一性の改善を図ったも
のに関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an insulating composition and a polyethylene electrical cable, and particularly to an insulator with improved water resistance and integrity.
〈従来の技術〉
ポリエチレンの優れた絶縁性を利用し、さらに架橋によ
り熱的特性を向上させた架橋ポリエチレンケーブル（Ｘ
ＬＰＥケーブル）は広く知られている。<Conventional technology> Cross-linked polyethylene cable (X
LPE cable) is widely known.
このＸＬＰＥケーブルの弱点は同ケーブル特有の現象と
して絶縁体中の水分と局部的異常電界の存在によって水
トリーが発生し、ケーブルの絶縁性能を低下させる問題
がある。このＸＬＰＥ絶縁層中の水トリーは疎水性ポリ
マーであるポリエチレン中に局部的に異常電界があると
、そこに水が集中することによって起こると考えられる
。The weak point of this XLPE cable is that water treeing occurs due to moisture in the insulator and the presence of local abnormal electric fields, which is a phenomenon unique to the cable, which deteriorates the insulation performance of the cable. This water tree in the XLPE insulating layer is thought to occur when water is concentrated in polyethylene, which is a hydrophobic polymer, when there is an abnormal electric field locally.
従って、極性基を有し、ある程度親水性のあるポリマー
をブレンドすることによって局部的異常電界部に水が集
中するのを防ぎ、耐水トリー性の改善に効果が得られる
ものと考えられる。Therefore, it is considered that by blending a polymer that has a polar group and is hydrophilic to some extent, it is possible to prevent water from concentrating in the local abnormal electric field and to improve the water resistance.
実際に、エチレン−酢酸ビニル共重合体（ＥＶＡ）やエ
チレン−エチルアクリレート共重合体（ＥＥＡ）をブレ
ンドすることによって、耐水トリー性を改善するという
提案は既に幾つか見受けられる。In fact, there have already been some proposals to improve water resistance by blending ethylene-vinyl acetate copolymer (EVA) or ethylene-ethyl acrylate copolymer (EEA).
〈発明が解決しようとする課題〉
しかしながら、上記従来のブレンドによる絶縁組成物に
あっても、水トリー抑止効果は未だ不十分であり、特に
配電クラス電カケープルのような水中に浸漬される状態
があるような条件の厳しいもとではより一層の耐水トリ
ー性の改善が望まれていた。<Problems to be Solved by the Invention> However, even with the above-mentioned conventional blended insulating compositions, the water tree prevention effect is still insufficient, especially when the insulation composition is immersed in water, such as in distribution class electric cables. Under certain severe conditions, further improvement in water resistance has been desired.
本発明は、このような要請のもとになされたものである
。The present invention was made based on such a request.
〈課題を解決するための手段及びその作用〉か＼る本発
明の特徴とする点は、ポリエチレンとして超低密度ポリ
エチレン（密度０．９１〜０゜８８ｇ／ｃｍ３、以下、
ＵＬＤＰＥという）を使用し、かつブレンドするエチレ
ン−アクリル酸共重合体との混合物において、アクリル
酸含有量を特定量（０，５〜１０重量％）の範囲とする
ことにより、耐水トリー性の改善を図ったことにある。<Means for solving the problems and their effects> The feature of the present invention is that the polyethylene is ultra-low density polyethylene (density 0.91 to 0°88 g/cm3, hereinafter referred to as
Improved water resistance by using acrylic acid (ULDPE) and adjusting the acrylic acid content within a specific range (0.5 to 10% by weight) in the mixture with the ethylene-acrylic acid copolymer to be blended. This is what we aimed for.
より具体的には、本発明は、ＵＬＤＰＥとエチレン−ア
クリル酸共重合体の混和物であって、該混和物中のアク
リル酸含有量が０．５〜１０重量％である絶縁組成物お
よびこの絶縁組成物を絶縁体とした電カケープルにある
。More specifically, the present invention provides an insulating composition that is a blend of ULDPE and an ethylene-acrylic acid copolymer, the content of acrylic acid in the blend being from 0.5 to 10% by weight; It is an electric cable that uses an insulating composition as an insulator.
本発明において、エチレン−アクリル酸共重合体は、耐
水トリー性の改善のためにブレンドされるものであり、
このエチレン−アクリル酸共重合体とＵＬＤＰＥとの混
合割合は、特に限定されないが、ＵＬＤＰＥとの混合物
において、そのアクリル酸含有量を０．５〜１０重量％
とじたのは、０．５重量％未満では水トリー抑止効果が
小さく、１０ｆｆ１１％をこえるとケーブルの電気特性
、特に誘電正接（ｔａｎδ）が悪化するからである。In the present invention, the ethylene-acrylic acid copolymer is blended to improve water tree resistance,
The mixing ratio of this ethylene-acrylic acid copolymer and ULDPE is not particularly limited, but in the mixture with ULDPE, the acrylic acid content is 0.5 to 10% by weight.
The reason why it is closed is because if it is less than 0.5% by weight, the water tree suppression effect is small, and if it exceeds 10ff11%, the electrical properties of the cable, especially the dielectric loss tangent (tan δ), deteriorate.
そして、ＵＬＤＰＥの使用により、耐水トリー性の改善
が図られる理由としては、次のことが挙げられる。先ず
、水トリーは、ポリマー中の異常電界部に凝集した水分
がマンクスウェル応力等により、ポリマー中のミクロバ
ス（微細通路）やクランク（亀裂）等の形成を伴いなが
ら進展すると考えられる。ところが、ＵＬＤＰＥの場合
、結晶性が少ないゴム状に近い構造であるため、凝集水
は集中しにくく、ＵＬＤＰＥ中に均一に拡散される傾向
となるので、ミクロバスやクランク等が発生し難く、す
なわち水トリーの進展が防止されると考えられる。The following are reasons why the water resistance can be improved by using ULDPE. First, water trees are thought to develop as water condensed in abnormal electric field areas in a polymer is accompanied by the formation of microbuses (fine passages) and cranks (cracks) in the polymer due to Manxwell stress and the like. However, in the case of ULDPE, since it has a rubber-like structure with low crystallinity, coagulated water is difficult to concentrate and tends to be uniformly diffused in ULDPE, making it difficult for microbaths and cranks to occur. It is thought that the development of trees is prevented.
また、この電カケープルを高温で使用した場合に懸念さ
れる絶縁体の流動変形を防止する手段として、適宜架橋
処理を施すことも可能である。この架橋処理の方法とし
ては、有機過酸化物系の架橋剤を使用する化学架橋、電
子線照射等による照射架橋、シランカップリング剤等を
用いたシラン架橋等がある。ここで、有機過酸化物系の
架橋剤としては１．ジクミルパーオキサイド（ＤＣＰ）
、１．３−ビス−（Ｌ−ブチルパーオキシ−イソプロビ
ル）ベンゼン等が好適に使用され、これらの混入量とし
ては、１〜３重量％が好ましい。In addition, as a means to prevent flow deformation of the insulator, which is a concern when this electric cable is used at high temperatures, it is also possible to perform appropriate crosslinking treatment. Methods for this crosslinking treatment include chemical crosslinking using an organic peroxide-based crosslinking agent, irradiation crosslinking using electron beam irradiation, and silane crosslinking using a silane coupling agent. Here, as the organic peroxide-based crosslinking agent, 1. Dicumyl peroxide (DCP)
, 1,3-bis-(L-butylperoxy-isopropyl)benzene, etc. are preferably used, and the amount of these mixed is preferably 1 to 3% by weight.
さらに、必要に応じて、４．４′−チオビス−（６−ｔ
−ブチル−３−メチルフェノール）、ペンタエリスチル
−テトラキス（３−（３，５−ジー１−ブチル−４−ヒ
ドロキシフェニル）プロピオネートコメタン等を単独で
あるいは併用し、０゜１〜０．３重量％程度の配合が好
ましい。Furthermore, if necessary, 4,4'-thiobis-(6-t
-butyl-3-methylphenol), pentaerythyl-tetrakis (3-(3,5-di-1-butyl-4-hydroxyphenyl)propionate comethane), alone or in combination, at 0°1 to 0. A blending amount of about 3% by weight is preferable.
〈実施例Ｉ〉
第１表に示した配合により、本発明に係る絶縁組成物（
実施例■〜■）と本発明の条件を満たさない絶縁組成物
（比較例■〜■）を作成した。<Example I> The insulation composition according to the present invention (
Examples (■ to ■)) and insulating compositions that did not satisfy the conditions of the present invention (comparative examples (■ to ■)) were prepared.
なお、使用したエチレン−アクリル酸共重合体はＭ、
Ｆ、 Ｒ，が３〜５のものであり、また架橋剤はＤＣ
Ｐを使用し、老化防止剤としては４，４−チオビス−（
６−ｔ−ブチル−３−メチルフェノール）とペンタエリ
スチル−テトラキス〔３−（３，５−ジーし一ブチルー
４−ヒドロキシフェニル）プロピオネートコメタンとを
４＝１の割合で混合したものを使用した。The ethylene-acrylic acid copolymer used was M,
F, R, are from 3 to 5, and the crosslinking agent is DC
4,4-thiobis-(
A mixture of 6-t-butyl-3-methylphenol) and pentaerythyl-tetrakis[3-(3,5-di-butyl-4-hydroxyphenyl)propionate comethane in a ratio of 4=1. used.
そして、上記各配合物を夫りの配合量に従いロールミル
により加熱下で混練した後、各々の樹脂混和物からプレ
ス成形により大きさｌＱｃｍＸｌｏｃｍ、厚さ１ｍｍま
たは３ｍｍのシート状物を得た。この際のプレス条件は
温度１８０°Ｃ１時間３０分とした。Then, each of the above-mentioned compositions was kneaded under heat in a roll mill according to the blending amount, and then a sheet-like product having a size of 1QcmXlocm and a thickness of 1mm or 3mm was obtained from each resin mixture by press molding. The pressing conditions at this time were a temperature of 180° C. and 1 hour and 30 minutes.
なお、こうして得られた各樹脂混和物からなる絶縁シー
トのゲル分率はいずれも８５％以上であった。この測定
は、１１０°Ｃの温キシレン中に２４時間浸漬して未架
橋部分のみを熔解せしめた後、乾燥してゲル分率を測定
するという方法によるものである。Note that the gel fraction of the insulating sheets made of each resin mixture thus obtained was 85% or more. This measurement is based on a method in which the material is immersed in warm xylene at 110° C. for 24 hours to melt only the uncrosslinked portion, and then dried and the gel fraction is measured.
次に、これらの絶縁体シートの水トリー発生数および誘
電正接（ｔａｎδ）を測定し、その結果を第１表に併記
した。Next, the number of water tree occurrences and the dielectric loss tangent (tan δ) of these insulating sheets were measured, and the results are also listed in Table 1.
この際の水トリー発生数を測定するための水トリー試験
法および誘電正接（ｔａｎδ）測定法をに示した。なお
、水トリー試験法については第１図に基づいて説明する
。A water tree test method and a dielectric loss tangent (tan δ) measurement method for measuring the number of water trees generated in this case are shown below. The water tree test method will be explained based on FIG. 1.
水トリー試験法
第１図において、１は試験試料として使用する絶縁シー
トである。この絶縁シート１は上記樹脂混和物をプレス
成形してなるシートであり、この水トリー試験において
は、厚さ３ｍｍのものを使用する。このシート１の底面
には導電性塗料の塗布層２を設けて接地電極とすると共
に、シート１の上面には水槽４を設けて水電極を形成し
て、これに１０ｋＶ、１ｋＨｚの電圧を高圧電極３より
印加できるように構成する。この電極間に３０日間印加
した後、上記シート１を煮沸して、このシート１上に発
生した水トリーを観察した。この際、５０μｍ以上の水
トリーにのみ着目することとし、これらの発生数を測定
した。Water tree test method In FIG. 1, 1 is an insulating sheet used as a test sample. This insulating sheet 1 is a sheet formed by press-molding the above-mentioned resin mixture, and in this water tree test, a sheet having a thickness of 3 mm is used. A coating layer 2 of conductive paint is provided on the bottom surface of the sheet 1 to serve as a ground electrode, and a water tank 4 is provided on the top surface of the sheet 1 to form a water electrode, to which a high voltage of 10 kV, 1 kHz is applied. The configuration is such that the voltage can be applied from the electrode 3. After applying the voltage between the electrodes for 30 days, the sheet 1 was boiled and water trees generated on the sheet 1 were observed. At this time, we focused only on water trees with a diameter of 50 μm or more, and measured the number of these.
なお、ここで、発生数は、従来の架橋ポリエチレン（Ｘ
ＬＰＥ）を意図して作成した比較用シートに発生した水
トリーの数を１００とした場合の相対数として記した。Note that here, the number of occurrences is based on conventional cross-linked polyethylene (X
The number is expressed as a relative number when the number of water trees generated on a comparison sheet prepared with the intention of 100 was 100.
誘電正接（ｔａｎδ）測定法
誘電正接（ｔａｎδ）の測定には、上記各配合物からな
る厚さ１ｍｍのシートを試料として用いる。これに、１
ｋＶ、５０ｋＥ−１ｘの電圧を印加して、シエーリング
ブリッジにより誘電正接（ｔａｎδ）を測定した。Dielectric Loss Tangent (tan δ) Measuring Method For measuring the dielectric loss tangent (tan δ), a 1 mm thick sheet made of each of the above formulations is used as a sample. To this, 1
A voltage of kV and 50 kE-1x was applied, and the dielectric loss tangent (tan δ) was measured using a Schering bridge.
上記第１表から、本発明実施例■〜■の場合は、比較例
■（ＸＬＰＥの絶縁体）に比べて、水トリー発生の抑制
効果があり、特に、アクリル酸含有量を０．５〜ｌＯ重
量％の範囲とした場合その効果が著しく、かつ、誘電正
接の値からも明らかなように絶縁性も通常のＸＬＰＥと
同程度であることが判る。From Table 1 above, Examples ① to ② of the present invention are more effective in suppressing water tree generation than Comparative Example ② (XLPE insulator), and in particular, the acrylic acid content is 0.5 to 0. It can be seen that the effect is remarkable when the content is in the range of 10% by weight, and as is clear from the value of the dielectric loss tangent, the insulation property is also comparable to that of ordinary XLPE.
一方、本発明のアクリル義金を量の限定条件を満たさな
い比較例■〜■の場合、水トリー発生の抑制効果が小さ
かったり、絶縁性が悪かったりすることが判る。On the other hand, in the case of Comparative Examples 1 to 2, in which the acrylic metal of the present invention does not satisfy the limited quantity conditions, it can be seen that the effect of suppressing water tree generation is small and the insulation properties are poor.
次に、上記実施例■と比較例■の絶縁組成物を絶縁体と
する電カケープルを作成した。このケーブルの構造は、
導体上に厚さ３ｍｍの絶縁層を設け、さらに内部半導電
層および外部半導電層を形成した３層構造を有するもの
で、通常外部に施す遮蔽やシースは省略した。この際、
導体として銅を用い、この導体断面積は１００ｍｍ”と
した。Next, electric cables were prepared using the insulating compositions of Example (2) and Comparative Example (2) as insulators. The structure of this cable is
It has a three-layer structure in which an insulating layer with a thickness of 3 mm is provided on the conductor, and an inner semiconducting layer and an outer semiconducting layer are formed, and the shielding or sheath that is normally applied to the outside is omitted. On this occasion,
Copper was used as the conductor, and the cross-sectional area of the conductor was 100 mm.
また、内部および外部半導電層にはエチレン−酢酸ビニ
ル共重合体に導電性カーボンブランクを配合した半導電
性混和物を使用し、押出被覆法によりその被覆層を形成
した。A semiconductive mixture of ethylene-vinyl acetate copolymer and a conductive carbon blank was used for the internal and external semiconductive layers, and the coating layers were formed by extrusion coating.
こうして作成した上記各電カケープルについて、以下に
示す浸水課電試験を行って、絶縁破壊電圧を求め、この
結果を第２表に示した。For each of the above-mentioned power cables thus prepared, the following submergence electrification test was conducted to determine the dielectric breakdown voltage, and the results are shown in Table 2.
浸水課電試験
７０°Ｃの温水中に上記各ケーブルを浸漬し、これに１
ｋＶ、１０ｋＨｚの電圧を９０日間印加した後、さらに
ＡＣ（５０Ｈｚ）の電圧を５ ｋ Ｖ ７３０分のステ
ップアップ条件で昇圧していき、絶縁破壊電圧を測定し
た。Water immersion charging test Each of the above cables was immersed in 70°C warm water, and 1
After applying a voltage of kV and 10 kHz for 90 days, the voltage of AC (50 Hz) was further increased under step-up conditions of 5 kV and 730 minutes, and the dielectric breakdown voltage was measured.
第２表
この第２表より、本発明実施例■の場合、比較例■に比
べて、浸水課電後の絶縁破壊電圧が高いことが判る。Table 2 From this Table 2, it can be seen that the dielectric breakdown voltage after water immersion electrification is higher in the case of Example 2 of the present invention than in Comparative Example 2.
〈発明の効果〉
以上の説明から明らかなように本発明の電カケープルに
よれば、ＵＬＤＰＥ （密度０．９１〜０゜８８ｇ／ｃ
ｍ３）とエチレン−アクリル酸共重合体の混和物であっ
て、該混和物中のアクリル酸含有量が０． ５〜１０重
量％であるあるため、絶縁性能（ｊａｎδ等）が従来の
ＸＬＰＥと同等程度であって、かつ水トリー発生の抑制
効果が大きい絶縁組成物が得られ、この絶縁組成物を絶
縁体に用いれば、絶縁性能（ｔａｎδ等）および耐水ト
リー性が良好で、浸水課電後の絶縁破壊電圧の低下もな
く、さらにＵＬＤＰＨの低い結晶化度により、可撓性に
も優れたケーブルを得ることができる。<Effects of the Invention> As is clear from the above explanation, according to the electric cable of the present invention, ULDPE (density 0.91 to 0°88 g/c
m3) and an ethylene-acrylic acid copolymer, the acrylic acid content in the mixture is 0. 5 to 10% by weight, it is possible to obtain an insulating composition whose insulating performance (jan δ, etc.) is comparable to that of conventional XLPE, and which is highly effective in suppressing water tree generation. If used for this purpose, a cable with good insulation performance (tan δ, etc.) and water resistance, no decrease in breakdown voltage after submerged electricity, and excellent flexibility due to the low crystallinity of ULDPH can be obtained. be able to.
なお、本発明の絶縁組成物はケーブルの絶縁体の他に必
要によりケーブルの接続部等に使用することができる。The insulating composition of the present invention can be used not only as an insulator for cables but also for connection parts of cables, etc., if necessary.
第１図は本発明における水トリー試験法を説明するため
の説明図である。
図中、１は試験試料、２は塗料層、３は電極、４は水槽
である。
特許出廓人
胚倉電線株式会社FIG. 1 is an explanatory diagram for explaining the water tree test method in the present invention. In the figure, 1 is a test sample, 2 is a paint layer, 3 is an electrode, and 4 is a water tank. Patent distributor Jingukura Electric Cable Co., Ltd.
Claims (2)
８ｇ／ｃｍ＾３）とエチレン−アクリル酸共重合体の混
和物であって、該混和物中のアクリル酸含有量が０．５
〜１０重量％である絶縁組成物。(1) Ultra-low density polyethylene (density 0.91-0.8
8g/cm^3) and an ethylene-acrylic acid copolymer, the acrylic acid content in the mixture is 0.5
~10% by weight of an insulating composition.
電力ケーブル。(2) A power cable using the insulating composition according to claim 1 as an insulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14149889A JPH036250A (en) | 1989-06-03 | 1989-06-03 | Insulating composition and electric cable using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14149889A JPH036250A (en) | 1989-06-03 | 1989-06-03 | Insulating composition and electric cable using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH036250A true JPH036250A (en) | 1991-01-11 |
Family
ID=15293341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14149889A Pending JPH036250A (en) | 1989-06-03 | 1989-06-03 | Insulating composition and electric cable using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH036250A (en) |
-
1989
- 1989-06-03 JP JP14149889A patent/JPH036250A/en active Pending
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