JPH10321056A - Cross-linked polyethylene insulated wire outdoor use - Google Patents
Cross-linked polyethylene insulated wire outdoor useInfo
- Publication number
- JPH10321056A JPH10321056A JP14595697A JP14595697A JPH10321056A JP H10321056 A JPH10321056 A JP H10321056A JP 14595697 A JP14595697 A JP 14595697A JP 14595697 A JP14595697 A JP 14595697A JP H10321056 A JPH10321056 A JP H10321056A
- Authority
- JP
- Japan
- Prior art keywords
- resin composition
- weight
- polyethylene
- layer
- parts
- 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
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 67
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 67
- 239000011342 resin composition Substances 0.000 claims abstract description 57
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 26
- 239000004020 conductor Substances 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- 150000001451 organic peroxides Chemical class 0.000 claims abstract description 18
- 229920013716 polyethylene resin Polymers 0.000 claims abstract description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000004705 High-molecular-weight polyethylene Substances 0.000 claims abstract description 8
- 229920001577 copolymer Polymers 0.000 claims abstract description 3
- -1 polyethylene Polymers 0.000 claims description 15
- 239000004698 Polyethylene Substances 0.000 claims description 14
- 229920000573 polyethylene Polymers 0.000 claims description 14
- 238000004132 cross linking Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 240000005572 Syzygium cordatum Species 0.000 abstract description 25
- 235000006650 Syzygium cordatum Nutrition 0.000 abstract description 25
- 238000009413 insulation Methods 0.000 abstract description 9
- 229920005989 resin Polymers 0.000 abstract description 4
- 239000011347 resin Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 117
- 238000012360 testing method Methods 0.000 description 21
- 239000002202 Polyethylene glycol Substances 0.000 description 18
- 239000006229 carbon black Substances 0.000 description 13
- 235000019241 carbon black Nutrition 0.000 description 13
- 238000002156 mixing Methods 0.000 description 9
- 239000008188 pellet Substances 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- 238000002360 preparation method Methods 0.000 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 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 239000006232 furnace black Substances 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000004711 α-olefin Substances 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 239000006230 acetylene black Substances 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000003273 ketjen black Substances 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 description 2
- ODBCKCWTWALFKM-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhex-3-yne Chemical compound CC(C)(C)OOC(C)(C)C#CC(C)(C)OOC(C)(C)C ODBCKCWTWALFKM-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- 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
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229960000907 methylthioninium chloride Drugs 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920005678 polyethylene based resin Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Organic Insulating Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、屋外用架橋ポリエ
チレン絶縁電線の製造方法、及びそれにより製造された
屋外用架橋ポリエチレン絶縁電線に関する。さらに詳し
くは、浸水課電で使用した場合でも、水トリーの発生が
なく、しかも、従来のものに比べて高品質でかつ長寿命
である屋外用架橋ポリエチレン絶縁電線の製造方法、及
びそれにより製造された屋外用架橋ポリエチレン絶縁電
線に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a crosslinked polyethylene insulated wire for outdoor use, and a crosslinked polyethylene insulated wire for outdoor use produced thereby. More specifically, a method for producing a crosslinked polyethylene insulated electric wire for outdoor use which does not generate water trees even when used in flooding and has higher quality and longer life than conventional ones, and And a crosslinked polyethylene insulated wire for outdoor use.
【０００２】[0002]
【従来の技術】屋外用高圧架空配電線は、当初の頃、導
体のみの裸線が使用されていたが、この場合、屋外の空
中に張られるため、飛来物等による災害、人が触れるこ
とによって起こる感電の危険性、導体の風雨による劣化
等の問題があり、この問題を回避するため、導体上に絶
縁体を被覆した絶縁電線が検討されるようになった。そ
の結果、昭和３８年には、架橋ポリエチレン絶縁ビニー
ルシース電力ケーブルが規格制定され、今日では、屋外
用架橋ポリエチレン絶縁電線が製造され、屋外用架空配
電線として使用されている。そして、現在のところ、日
本では、導体上にポリエチレン系樹脂１００重量部と導
電性カーボンブラック０．１〜２重量部からなる樹脂組
成物を被覆した構造の屋外用架空配電線が主流をなして
いる。2. Description of the Related Art At the beginning, bare high-voltage overhead distribution lines for outdoor use consisted of bare conductors consisting of conductors only. There are problems such as danger of electric shock, deterioration of conductors due to wind and rain, and the like, and in order to avoid this problem, insulated wires having conductors coated with an insulator have been studied. As a result, in 1963, a cross-linked polyethylene insulated vinyl sheathed power cable was enacted, and today, outdoor cross-linked polyethylene insulated wires are manufactured and used as outdoor overhead distribution lines. At present, in Japan, outdoor overhead distribution lines having a structure in which a conductor is coated with a resin composition comprising 100 parts by weight of a polyethylene resin and 0.1 to 2 parts by weight of conductive carbon black have become mainstream. I have.
【０００３】一方、これに対し、東南アジアでは、導体
上に、内部半導電層、架橋ポリエチレン絶縁層、及びポ
リエチレンとカーボンブラックからなるジャケット層を
順次被覆した構造の屋外用架空電線が使用されている。
しかし、上記の東南アジアで使用されている、導体上に
内部半導電層、架橋ポリエチレン絶縁層及びジャケット
層を有する構造の屋外用架空電線の場合、高電圧、大容
量の電流を送電するには優れているものの、電線引留
部、分岐部及びジャケット被覆層から架橋絶縁層に水分
が浸入し、絶縁劣化を起こしやすいため、電線の寿命が
短かいといった問題が発生している。On the other hand, in Southeast Asia, an outdoor overhead electric wire having a structure in which a conductor is sequentially coated with an inner semiconductive layer, a crosslinked polyethylene insulating layer, and a jacket layer made of polyethylene and carbon black is used. .
However, in the case of an outdoor overhead electric wire having a structure having an inner semiconductive layer, a cross-linked polyethylene insulating layer, and a jacket layer on a conductor, which is used in the above Southeast Asia, it is excellent for transmitting high voltage and large capacity current. However, moisture penetrates into the cross-linked insulating layer from the wire retaining portion, the branch portion, and the jacket coating layer, and the insulation is easily deteriorated, so that there is a problem that the life of the wire is short.
【０００４】こうした導体上に内部半導電層、架橋ポリ
エチレン絶縁層及びジャケット層を有する構造をした従
来の屋外用架空電線の問題点を解消するため、これまで
種々の試みがなされてきたが、これらはいずれも満足の
ゆくものではなく、水トリーの発生がなく、従来のもの
に比べて高品質で長寿命である屋外用架橋ポリエチレン
絶縁電線の出現が当業界では強く望まれている。Various attempts have been made to solve the problems of the conventional outdoor overhead electric wires having a structure having an inner semiconductive layer, a crosslinked polyethylene insulating layer and a jacket layer on such a conductor. Are not satisfactory, and there is a strong demand in the art for an outdoor crosslinked polyethylene insulated wire having no water tree and having higher quality and longer life than conventional ones.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、浸水
課電で使用した場合でも、架橋ポリエチレン絶縁層の水
分による絶縁劣化を防止し、しかも、高品質でかつ長寿
命である屋外用架橋ポリエチレン絶縁電線の製造方法、
及びそれにより製造された屋外用架橋ポリエチレン絶縁
電線を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-quality, long-life outdoor cross-linking structure that prevents insulation deterioration due to moisture in a cross-linked polyethylene insulating layer even when used in flooding. Manufacturing method of polyethylene insulated wire,
And to provide an outdoor cross-linked polyethylene insulated wire manufactured thereby.
【０００６】[0006]
【課題を解決するための手段】本発明者は、導体上に内
部半導電層、架橋ポリエチレン絶縁層及びジャケット層
を有する構造をした屋外用架橋ポリエチレン絶縁電線の
絶縁劣化の原因について検討したところ、これは架橋ポ
リエチレン絶縁層に浸入した水分に高電圧が課電される
ことによって発生する、いわゆる水トリー、によっても
たらされることに気づき、架橋ポリエチレン絶縁層用樹
脂に配合すべき化合物について鋭意研究した結果、特定
の化合物が優れた絶縁劣化抑制効果を奏することを見出
した。本発明は、これらの知見に基づいて完成するに至
ったものである。Means for Solving the Problems The present inventor examined the cause of insulation deterioration of an outdoor crosslinked polyethylene insulated wire having a structure having an inner semiconductive layer, a crosslinked polyethylene insulating layer and a jacket layer on a conductor. We noticed that this is caused by the so-called water tree, which is generated by applying a high voltage to the moisture that has penetrated into the cross-linked polyethylene insulating layer, and as a result of intensive research on the compounds to be blended in the resin for the cross-linked polyethylene insulating layer. It has been found that a specific compound has an excellent insulation deterioration suppressing effect. The present invention has been completed based on these findings.
【０００７】すなわち、本発明によれば、導体上に内部
半導電層用樹脂組成物、架橋ポリエチレン絶縁層用樹脂
組成物及びジャケット層用樹脂組成物を順次被覆する工
程と、加熱架橋を行う工程からなる屋外用架橋ポリエチ
レン絶縁電線の製造方法において、（Ａ）該内部半導電
層用樹脂組成物がポリエチレン系共重合体１００重量部
と、導電性カーボンブラック８〜１００重量部を含むこ
と、（Ｂ）該架橋ポリエチレン絶縁層用樹脂組成物がポ
リエチレン系樹脂１００重量部と、有機過酸化物０．１
〜５重量部と、分子量１，０００〜２０，０００の高分
子量ポリエチレングリコール０．２〜１０重量部を含む
こと、及び（Ｃ）該ジャケット層用樹脂組成物がポリエ
チレン系樹脂１００重量部と、導電性カーボンブラック
０．１〜２．０重量部含むこと、を特徴とする屋外用架
橋ポリエチレン絶縁電線の製造方法が提供される。That is, according to the present invention, a step of sequentially coating a resin composition for an internal semiconductive layer, a resin composition for a crosslinked polyethylene insulating layer, and a resin composition for a jacket layer on a conductor, and a step of performing thermal crosslinking. (A) wherein the resin composition for an internal semiconductive layer comprises 100 parts by weight of a polyethylene copolymer and 8 to 100 parts by weight of conductive carbon black, B) The resin composition for a crosslinked polyethylene insulating layer comprises 100 parts by weight of a polyethylene resin and 0.1 part of an organic peroxide.
And 5 to 10 parts by weight, and 0.2 to 10 parts by weight of a high molecular weight polyethylene glycol having a molecular weight of 1,000 to 20,000, and (C) the resin composition for a jacket layer comprises 100 parts by weight of a polyethylene resin. A method for producing a crosslinked polyethylene insulated wire for outdoor use, comprising 0.1 to 2.0 parts by weight of conductive carbon black.
【０００８】また、本発明によれば、上記の製造方法に
より製造された屋外用架橋ポリエチレン絶縁電線が提供
される。Further, according to the present invention, there is provided an outdoor crosslinked polyethylene insulated wire manufactured by the above manufacturing method.
【０００９】本発明は、上記した如く、導体上に内部半
導電層用樹脂組成物、架橋ポリエチレン絶縁層用樹脂組
成物及びジャケット層用樹脂組成物を順次被覆する工程
と、加熱架橋を行う工程からなる屋外用架橋ポリエチレ
ン絶縁電線の製造方法であって、該内部半導電層用樹脂
組成物、架橋ポリエチレン絶縁層用樹脂組成物及びジャ
ケット層用樹脂組成物がそれぞれ特定の化合物を特定量
含むことを特徴とする屋外用架橋ポリエチレン絶縁電線
の製造方法、及びそれにより製造された高品質かつ長寿
命の屋外用架橋ポリエチレン絶縁電線に係わるものであ
るが、その好ましい態様としては、次のものが包含され
る。 （１）導体上に内部半導電層用樹脂組成物、架橋ポリエ
チレン絶縁層用樹脂組成物及びジャケット層用樹脂組成
物を順次被覆する工程と、加熱架橋を行う工程からなる
屋外用架橋ポリエチレン絶縁電線の製造方法において、
（Ａ）該内部半導電層用樹脂組成物がポリエチレン系共
重合体１００重量部と、導電性カーボンブラック８〜１
００重量部と、所望に応じて分子量１，０００〜２０，
０００の高分子量ポリエチレングリコール０．２〜１０
重量部および／または有機過酸化物０．５〜５重量部を
含むこと、（Ｂ）該架橋ポリエチレン絶縁層用樹脂組成
物がポリエチレン系樹脂１００重量部と、有機過酸化物
０．１〜５重量部と、分子量１，０００〜２０，０００
の高分子量ポリエチレングリコール０．２〜１０重量部
を含むこと、及び（Ｃ）該ジャケット層用樹脂組成物が
ポリエチレン系樹脂１００重量部と、導電性カーボンブ
ラック０．１〜２．０重量部と、所望に応じて有機過酸
化物０．５〜５重量部を含むこと、を特徴とする屋外用
架橋ポリエチレン絶縁電線の製造方法。 （２）導体上に内部半導電層用樹脂組成物、架橋ポリエ
チレン絶縁層用樹脂組成物及びジャケット層用樹脂組成
物を順次被覆する工程がコモン三層押出機により行われ
ることを特徴とする前記（１）記載の屋外用架橋ポリエ
チレン絶縁電線の製造方法。 （３）加熱架橋を行う工程が架橋管内で１５０〜２５０
℃の温度下で行われることを特徴とする前記（１）又は
（２）記載の屋外用架橋ポリエチレン絶縁電線の製造方
法。 （４）前記（１）〜（３）記載の製造方法により製造さ
れることを特徴とする屋外用架橋ポリエチレン絶縁電
線。As described above, the present invention comprises a step of sequentially coating a resin composition for an internal semiconductive layer, a resin composition for a crosslinked polyethylene insulating layer and a resin composition for a jacket layer on a conductor, and a step of performing heat crosslinking. The method for producing an outdoor cross-linked polyethylene insulated wire according to claim 1, wherein the resin composition for the internal semiconductive layer, the resin composition for the cross-linked polyethylene insulating layer, and the resin composition for the jacket layer each contain a specific amount of a specific compound. The present invention relates to a method for producing a crosslinked polyethylene insulated wire for outdoor use, and a high-quality and long-life crosslinked polyethylene insulated wire for outdoor use produced by the method. Is done. (1) A step of sequentially covering a conductor with a resin composition for an internal semiconductive layer, a resin composition for a cross-linked polyethylene insulating layer, and a resin composition for a jacket layer, and a step of performing heat cross-linking, and a step of performing cross-linking for outdoor use. In the manufacturing method of
(A) The resin composition for an internal semiconductive layer comprises 100 parts by weight of a polyethylene copolymer and conductive carbon blacks 8 to 1
00 parts by weight and, if desired, a molecular weight of 1,000 to 20,
000 high molecular weight polyethylene glycol 0.2-10
(B) the resin composition for a crosslinked polyethylene insulating layer contains 100 parts by weight of a polyethylene resin and 0.1 to 5 parts by weight of an organic peroxide. Parts by weight and a molecular weight of 1,000 to 20,000
And (C) 100 parts by weight of a polyethylene resin and 0.1 to 2.0 parts by weight of conductive carbon black. And optionally containing 0.5 to 5 parts by weight of an organic peroxide. (2) The step of sequentially coating a resin composition for an internal semiconductive layer, a resin composition for a crosslinked polyethylene insulating layer, and a resin composition for a jacket layer on a conductor is performed by a common three-layer extruder. (1) The method for producing a crosslinked polyethylene insulated wire for outdoor use according to (1). (3) The step of performing thermal crosslinking is 150 to 250 in the crosslinking tube.
The method for producing a crosslinked polyethylene insulated wire for outdoor use according to the above (1) or (2), which is carried out at a temperature of ° C. (4) An outdoor crosslinked polyethylene insulated wire manufactured by the manufacturing method according to (1) to (3).
【００１０】[0010]
【発明の実施の形態】以下、本発明について詳細に説明
する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
【００１１】１．導体及び内部半導電層 本発明で用いられる導体及び内部半電層は、通常屋外用
架橋ポリエチレン絶縁電線において使用されるものなら
ば何でもよい。それらのうち、導体としては、例えば、
軟銅、半硬銅、硬銅、アルミニウム等を素材とする充実
導体や撚線導体等が好ましい。また、内部半導電層とし
ては、例えば、エチレン−酢酸ビニル共重合体、エチレ
ン−エチルアクリレート共重合体等のポリエチレン系共
重合体にカーボンブラック等を配合したものが好まし
い。ポリエチレン系共重合体が内部半導電層に好んで用
いられる理由は、内部半導電層を半導電性とする上で、
大量のカーボンブラックを配合する必要があるが、ポリ
エチレン系共重合体が他の樹脂に比べてカーボンブラッ
クとの混和性や分散性に優れ、かつ、導体や絶縁層との
密着性にすぐれているためである。内部半導電層の役目
は、電位傾向の改善や同電位化を図り、耐電圧性能を向
上させることであり、その結果、屋外電線の長寿命化が
計られる。1. Conductor and Internal Semiconductive Layer The conductor and the internal semiconductive layer used in the present invention may be any as long as they are generally used in outdoor crosslinked polyethylene insulated wires. Among them, as a conductor, for example,
Solid conductors and stranded conductors made of soft copper, semi-hard copper, hard copper, aluminum or the like are preferable. Further, as the internal semiconductive layer, for example, a material obtained by blending carbon black or the like with a polyethylene copolymer such as an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer is preferable. The reason that the polyethylene copolymer is preferably used for the inner semiconductive layer is to make the inner semiconductive layer semiconductive,
It is necessary to mix a large amount of carbon black, but the polyethylene copolymer has better miscibility and dispersibility with carbon black than other resins, and has excellent adhesion to conductors and insulating layers That's why. The role of the inner semiconductive layer is to improve the electric potential tendency and equalize the electric potential, and to improve the withstand voltage performance. As a result, the life of the outdoor electric wire is prolonged.
【００１２】内部半導電層用に配合されるカーボンブラ
ックとしては、ファーネスブラック、アセチレンブラッ
ク、ケッチェンブラック等の導電性のものが挙げられ
る。カーボンブラックの配合量は、ポリエチレン系共重
合体１００重量部に対してカーボンブラック８〜１００
重量部である。カーボンブラックの配合量が８重量部未
満であると、たとえ良導電性のケッチェンブラックを使
用しても、導電性能が不足し、一方カーボンブラックの
配合量が１００重量部以上であると、経済性が悪くなる
上、押出性、表面特性等が悪くなり望ましくない。As the carbon black compounded for the internal semiconductive layer, conductive carbon black, acetylene black, Ketjen black and the like can be used. The blending amount of carbon black is 8 to 100 parts by weight of carbon black with respect to 100 parts by weight of the polyethylene copolymer.
Parts by weight. If the blending amount of carbon black is less than 8 parts by weight, even if Ketjen black having good conductivity is used, the conductive performance is insufficient. On the other hand, if the blending amount of carbon black is 100 parts by weight or more, it is economical. In addition, the extrudability and the surface properties are deteriorated, which is not desirable.
【００１３】本発明では、内部半導電層にポリエチレン
グリコールを配合することもできる。この場合、ポリエ
チレングリコールを配合することにより、内部半導電層
と絶縁層との界面が平滑になり、絶縁層との界面から絶
縁層の中に向って成長する水トリーを抑制でき、屋外電
線の寿命が、ポリエチレングリコールを配合しない場合
より長くなる。用いられるポリエチレングリコールとし
ては、分子量１，０００〜２０，０００の高分子量ポリ
エチレングリコールが好ましく。その配合量は、ポリエ
チレン系共重合体１００重量部に対して、分子量１，０
００〜２０，０００の高分子量ポリエチレングリコール
０．２〜１０重量部である。ポリエチレングリコールの
分子量が１，０００未満であると、ポリエチレン樹脂と
の混練性が悪く、水トリー抑制効果の持続性も十分でな
く、一方、その分子量が２０，０００以上であると、分
散性や移行性が十分でなく目的を達することができな
い。また、ポリエチレングリコールの配合量が０．２重
量部未満であると、水トリー抑制効果を発現しなく、一
方その配合量が１０重量部以上であると、均一に混合で
きず、経済性も悪くなり望ましくない。In the present invention, polyethylene glycol may be blended in the inner semiconductive layer. In this case, by blending polyethylene glycol, the interface between the inner semiconductive layer and the insulating layer becomes smooth, and water trees growing from the interface with the insulating layer toward the inside of the insulating layer can be suppressed. The life is longer than without polyethylene glycol. The polyethylene glycol used is preferably a high molecular weight polyethylene glycol having a molecular weight of 1,000 to 20,000. The blending amount is 100 parts by weight of the polyethylene copolymer and the molecular weight is 1.0 or less.
0.2 to 10 parts by weight of a high molecular weight polyethylene glycol having a molecular weight of 00 to 20,000. When the molecular weight of the polyethylene glycol is less than 1,000, the kneadability with the polyethylene resin is poor, and the sustainability of the water tree suppressing effect is not sufficient. On the other hand, when the molecular weight is 20,000 or more, the dispersibility and The migration is not enough and the purpose cannot be achieved. If the amount of polyethylene glycol is less than 0.2 parts by weight, no water tree-suppressing effect is exhibited. On the other hand, if the amount is 10 parts by weight or more, uniform mixing cannot be achieved, resulting in poor economic efficiency. It is not desirable.
【００１４】２．架橋ポリエチレン絶縁層 本発明の架橋ポリエチレン絶縁層に用いられるポリエチ
レン系樹脂は、通常この分野で使用されるものならば何
でもよい。これに該当するものとしては、例えば、高圧
法低密度ポリエチレン、マルチサイト触媒によるエチレ
ン−α−オレフィン共重合体、シングルサイト触媒によ
るエチレン−α−オレフィン共重合体等が挙げられる。2. Crosslinked polyethylene insulating layer The polyethylene-based resin used for the crosslinked polyethylene insulating layer of the present invention may be any one which is usually used in this field. Examples of this include a high-pressure low-density polyethylene, an ethylene-α-olefin copolymer using a multi-site catalyst, and an ethylene-α-olefin copolymer using a single-site catalyst.
【００１５】また、本発明の架橋ポリエチレン絶縁層に
用いられる有機過酸化物としては、例えば、１，１−ビ
ス第三ブチル−パ−オキシベンゾエート、２，２−ビス
第三ブチル−パーオキシブタン、第三ブチルパーオキシ
ベンゾエート、ジクミルパーオキサイド、２，５−ジメ
チル−２，５−ジ第三ブチルパーオキシヘキサン、第三
ブチルクシル−パーオキサイド、２，５−ジメチル−
２，５−ジ第三ブチル−パーオキシヘキシン−３等の１
分間半減期を得るまでの分解温度が１５０〜２００℃で
ある有機過酸化物が挙げられる。有機過酸化物の配合量
は、ポリエチレン系樹脂１００重量部に対して０．１〜
５重量部の範囲であることが必要である。配合量が０．
１重量部未満であると、架橋ポリエチレン絶縁層の耐熱
性、機械的強度、絶縁性が不十分であり、一方配合量が
５重量部以上であると、経済性が悪くなり望ましくな
い。Examples of the organic peroxide used in the crosslinked polyethylene insulating layer of the present invention include 1,1-bis-tert-butyl-peroxybenzoate and 2,2-bis-tert-butyl-peroxybutane. Tert-butyl peroxybenzoate, dicumyl peroxide, 2,5-dimethyl-2,5-ditert-butylperoxyhexane, tert-butylcusyl-peroxide, 2,5-dimethyl-
1, such as 2,5-di-tert-butyl-peroxyhexyne-3
Organic peroxides having a decomposition temperature of 150 to 200 ° C. until a half-life of one minute is obtained. The amount of the organic peroxide is 0.1 to 100 parts by weight of the polyethylene resin.
It must be in the range of 5 parts by weight. The blending amount is 0.
If the amount is less than 1 part by weight, the heat resistance, mechanical strength, and insulating properties of the crosslinked polyethylene insulating layer are insufficient, and if the amount is more than 5 parts by weight, the economic efficiency is deteriorated, which is not desirable.
【００１６】また一方、本発明の架橋ポリエチレン絶縁
層に用いられる重要な成分であるポリエチレングリコー
ルとしては、好ましくは、分子量範囲が１，０００〜２
０，０００である高分子量ポリエチレングリコールが用
いられる。その配合量は、ポリエチレン系樹脂１００重
量部に対して０．２〜１０重量部の範囲であることが必
要である。この特定分子量、特定量のポリエチレングリ
コールを配合すると、内部半導電層と絶縁層との界面が
平滑になり、絶縁層との界面から絶縁層の中に向って成
長する水トリーを抑制でき、屋外電線の寿命が、配合し
ない場合より長くなる。ポリエチレングリコールの分子
量が１，０００未満であると、ポリエチレン樹脂との混
練性が悪く、水トリー抑制効果の持続性も十分ではな
く、また、分子量が２０，０００以上であると、分散性
及び移行性が十分でなく本発明の目的を達することがで
きない。また、ポリエチレングリコールの配合量が０．
２重量部未満であると、水トリー抑制効果を発現しな
く、一方、配合量が１０重量部以上であると、均一に混
合できず経済性も悪くなり望ましくない。本発明におい
て、架橋ポリエチレン絶縁層は、高電圧電流を絶縁し、
高温に耐え外部からの機械的応力を吸収し、緩和する機
能を果たす。On the other hand, polyethylene glycol, which is an important component used in the crosslinked polyethylene insulating layer of the present invention, preferably has a molecular weight range of 1,000 to 2,
A high molecular weight polyethylene glycol of 000 is used. It is necessary that the compounding amount is in the range of 0.2 to 10 parts by weight based on 100 parts by weight of the polyethylene resin. When this specific molecular weight and specific amount of polyethylene glycol are blended, the interface between the inner semiconductive layer and the insulating layer becomes smooth, and water trees growing from the interface with the insulating layer toward the inside of the insulating layer can be suppressed. The service life of the wire is longer than without the compound. If the molecular weight of the polyethylene glycol is less than 1,000, the kneadability with the polyethylene resin is poor, the durability of the water tree suppressing effect is not sufficient, and if the molecular weight is 20,000 or more, the dispersibility and migration are reduced. And the object of the present invention cannot be achieved. Further, the blending amount of polyethylene glycol is 0.1.
If the amount is less than 2 parts by weight, the effect of suppressing water tree will not be exhibited. On the other hand, if the amount is more than 10 parts by weight, it will not be possible to mix uniformly and the economical efficiency will deteriorate, which is not desirable. In the present invention, the crosslinked polyethylene insulating layer insulates high voltage current,
It withstands high temperatures and absorbs and relieves external mechanical stress.
【００１７】３．ジャケット層 本発明のジャケット層に用いられるポリエチレン系樹脂
としては、例えば、高圧法低密度ポリエチレン、マルチ
サイト触媒によるエチレン−α−オレフィン共重合体、
シングルサイト触媒によるエチレン−α−オレフィン共
重合体、エチレン−プロピレンラバー等が挙げられる。
また、本発明のジャケット層には、ファーネスブラッ
ク、アセチレンブラック、ケッチェンブラック等のカー
ボンブラックが用いらる。その配合量は、ポリエチレン
系樹脂１００重量部に対して０．１〜２．０重量部の範
囲であることが必要である。カーボンブラックは、電線
に耐候性を付与するために配合するものであり、その配
合量が０．１重量部未満であると、耐候性を発現しなく
望ましくなく、一方、その配合量が２．０重量部を越え
ると、耐トラッキング性が悪くなり望ましくない。カー
ボンブラックの配合量としては、０．３〜０．８重量部
の範囲が耐候性と耐トラッキング性のバランスの面から
望ましい。3. Jacket layer As the polyethylene resin used in the jacket layer of the present invention, for example, high-pressure low-density polyethylene, ethylene-α-olefin copolymer with a multi-site catalyst,
Ethylene-α-olefin copolymers using a single-site catalyst, ethylene-propylene rubber and the like can be mentioned.
For the jacket layer of the present invention, carbon black such as furnace black, acetylene black, and Ketjen black is used. It is necessary that the amount is in the range of 0.1 to 2.0 parts by weight based on 100 parts by weight of the polyethylene resin. Carbon black is compounded for imparting weather resistance to the electric wire. If the compounding amount is less than 0.1 part by weight, weather resistance is not exhibited, which is not desirable. If the amount exceeds 0 parts by weight, the tracking resistance becomes poor, which is not desirable. The amount of carbon black is preferably in the range of 0.3 to 0.8 parts by weight from the viewpoint of the balance between weather resistance and tracking resistance.
【００１８】本発明では、内部半導電層用樹脂組成物及
び／又はジャケット層用樹脂組成物に、有機過酸化物
０．５〜５重量部を配合してもよい。有機過酸化物とし
ては、例えば、１，１−ビス第三ブチル−パ−オキシベ
ンゾエート、２，２−ビス第三ブチル−パーオキシブタ
ン、第三ブチルパーオキシベンゾエート、ジクミルパー
オキサイド、２，５−ジメチル−２，５−ジ第三ブチル
パーオキシヘキサン、第三ブチルクシル−パーオキサイ
ド、２，５−ジメチル−２，５−ジ第三ブチル−パーオ
キシヘキシン−３等の１分間半減期を得るまでの分解温
度が１５０〜２００℃である有機過酸化物が挙げられ
る。この場合、有機過酸化物を配合すると、各層の耐熱
性、機械的強度を増加させる効果がある。In the present invention, the resin composition for the internal semiconductive layer and / or the resin composition for the jacket layer may contain 0.5 to 5 parts by weight of an organic peroxide. Examples of the organic peroxide include 1,1-bis-tert-butyl-peroxybenzoate, 2,2-bis-tert-butyl-peroxybutane, tert-butylperoxybenzoate, dicumyl peroxide, 1-minute half-life of 5-dimethyl-2,5-di-tert-butylperoxyhexane, tert-butyl succil-peroxide, 2,5-dimethyl-2,5-di-tert-butyl-peroxyhexyne-3, etc. And an organic peroxide having a decomposition temperature of 150 to 200 ° C. until the compound is obtained. In this case, the addition of an organic peroxide has the effect of increasing the heat resistance and mechanical strength of each layer.
【００１９】４．屋外用架橋ポリエチレン絶縁電線 本発明の屋外用架橋ポリエチレン絶縁電線は、導体上
に、内部半導電層、架橋ポリエチレン絶縁層、及びジャ
ケット層を被覆形成することにより得られる。これらの
層を被覆形成する場合、各層を別々に被覆してもよい
が、好ましくは、３台の押出機を縦列に連結したタンデ
ム押出機や三層を同時に押し出すコモン三層押出機を使
用し、これら三層を同時に被覆する方が望ましい。そし
てこのことにより、各層間の密着がよくなり、しかも界
面に突起が発生しない上に、水トリーや電気トリーが発
生しなく、その結果、電線の寿命を長くすることができ
る。被覆形成された架橋ポリエチレン絶縁層は、次いで
架橋管内で加熱架橋される。この加熱架橋は、通常１５
０〜２５０℃の温度下で行われる。4. Outdoor crosslinked polyethylene insulated wire The outdoor crosslinked polyethylene insulated wire of the present invention is obtained by coating an inner semiconductive layer, a crosslinked polyethylene insulating layer, and a jacket layer on a conductor. When coating these layers, each layer may be coated separately, but preferably, a tandem extruder in which three extruders are connected in tandem or a common three-layer extruder that extrudes three layers simultaneously is used. Preferably, these three layers are simultaneously coated. As a result, the adhesion between the respective layers is improved, and furthermore, no protrusion is generated at the interface, and no water tree or electric tree is generated. As a result, the life of the electric wire can be extended. The coated crosslinked polyethylene insulation layer is then heat crosslinked in a crosslink tube. This heat crosslinking usually takes 15 minutes.
It is performed at a temperature of 0 to 250 ° C.
【００２０】本発明の屋外用架橋ポリエチレン絶縁電線
は、水トリーや電気トリーの発生がなく、その結果、電
線の寿命を長く維持できるため、電信柱に装柱され、変
電所より、工場、事務所、商店、スポーツ設備、アミュ
ーズメント設備、学校、公共設備、家庭等に６〜３５Ｋ
Ｖの電流を送る架空線として広く利用される。The outdoor cross-linked polyethylene insulated electric wire of the present invention has no water tree or electric tree, and as a result, the life of the electric wire can be maintained for a long time. 6-35K for places, shops, sports facilities, amusement facilities, schools, public facilities, homes, etc.
Widely used as overhead wires for transmitting V current.
【００２１】[0021]
【実施例】以下、本発明の実施例を示すが、本発明はこ
れらに限定されるものではない。EXAMPLES Examples of the present invention will be shown below, but the present invention is not limited to these examples.
【００２２】［実施例１］ （Ａ）内部半導電層用樹脂組成物の準備 酢酸ビニル含有量が２８重量％、メルトインデックスが
２０ｇ／１０分、融点が９１℃の高圧法エチレン−酢酸
ビニル共重合体１００重量部に対して、酸化防止剤であ
るペンタエリスリトールテトラキス［３−（３，５−ジ
−ｔ−ブチル−４−ヒドロキシフェニル）プロピオネー
ト］（商品名Ｉｒｇａｎｏｘ１０１０）０．５重量部
と、アセチレンブラック８０重量部を配合し、これを１
３０℃で１０分間混練した後、直径３ｍｍ、高さ３ｍｍ
の円柱状のペレットとした。次いでこのペレットに有機
過酸化物である２，５−ジメチル−２，５−ジ（第三ブ
チルパーオキシ）ヘキシン０．５重量部を添加し、これ
を７０℃で５時間ゆっくり撹拌することにより、ペレッ
ト内部まで有機過酸化物を均一に含浸させ、内部半導電
層用樹脂組成物を調製した。Example 1 (A) Preparation of Resin Composition for Internal Semiconductive Layer A high-pressure ethylene-vinyl acetate copolymer having a vinyl acetate content of 28% by weight, a melt index of 20 g / 10 minutes and a melting point of 91 ° C. With respect to 100 parts by weight of the polymer, 0.5 parts by weight of pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] (trade name: Irganox 1010) which is an antioxidant; 80 parts by weight of acetylene black is blended,
After kneading at 30 ° C for 10 minutes, diameter 3mm, height 3mm
Columnar pellets. Next, 0.5 parts by weight of 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne as an organic peroxide was added to the pellets, and the mixture was stirred slowly at 70 ° C. for 5 hours. The organic peroxide was uniformly impregnated into the inside of the pellet to prepare a resin composition for an internal semiconductive layer.
【００２３】（Ｂ）架橋ポリエチレン絶縁層用樹脂組成
物の準備 密度が０．９２３ｇ／ｃｍ3、メルトインデックスが
３．５ｇ／１０分の高圧法低密度ポリエチレン１００重
量部に対して、酸化防止剤である４，４’−チオビス−
（６−ｔ−ブチル−ｍ−クレゾール）（商品名シーノッ
クスＢＣＳ）０．２重量部と、分子量１０，０００のポ
リエチレングリコール２重量部を配合し、これを１３０
℃で１０分間混練した後、直径３ｍｍ、高さ３ｍｍの円
柱状のペレットとした。次いでこのペレットに有機過酸
化物であるジクミルパーオキサイド３．５重量部を添加
し、これを６８℃で５時間ゆっくり撹拌することによ
り、ペレット内部まで有機過酸化物を均一に含浸させ、
架橋ポリエチレン絶縁層用樹脂組成物を調製した。(B) Preparation of Resin Composition for Crosslinked Polyethylene Insulating Layer An antioxidant is added to 100 parts by weight of a high-pressure low-density polyethylene having a density of 0.923 g / cm 3 and a melt index of 3.5 g / 10 minutes. 4,4'-thiobis-
0.2 parts by weight of (6-t-butyl-m-cresol) (trade name: Seanox BCS) and 2 parts by weight of polyethylene glycol having a molecular weight of 10,000 were blended, and the resulting mixture was mixed with 130 parts by weight.
After kneading at 10 ° C. for 10 minutes, a cylindrical pellet having a diameter of 3 mm and a height of 3 mm was obtained. Next, 3.5 parts by weight of dicumyl peroxide, which is an organic peroxide, was added to the pellet, and the mixture was slowly stirred at 68 ° C. for 5 hours to uniformly impregnate the organic peroxide into the inside of the pellet.
A resin composition for a crosslinked polyethylene insulating layer was prepared.
【００２４】（Ｃ）ジャケット層用樹脂組成物の準備 密度が０．９２３ｇ／ｃｍ3、メルトインデックスが
０．８ｇ／１０分の気相法直鎖状低密度エチレン−ブテ
ン−１共重合体１００重量部に対して、酸化防止剤であ
る４，４’−チオビス−（６−ｔ−ブチル−ｍ−クレゾ
ール）（商品名シーノックスＢＣＳ）０．２重量部と、
ファーネスブラック０．５重量部を配合し、これを１６
０℃で１０分間混練した後、直径３ｍｍ、高さ３ｍｍの
円柱状のペレットとした。次いでこのペレットに有機過
酸化物であるジクミルパーオキサイド２．５重量部を添
加し、これを７０℃で５時間ゆっくり撹拌することによ
り、ペレット内部まで有機過酸化物を均一に含浸させ、
ジャケット層用樹脂組成物を調製した。(C) Preparation of resin composition for jacket layer Gas-phase linear low-density ethylene-butene-1 copolymer 100 having a density of 0.923 g / cm 3 and a melt index of 0.8 g / 10 min. 0.2 parts by weight of an antioxidant 4,4′-thiobis- (6-t-butyl-m-cresol) (trade name: Seanox BCS) based on parts by weight;
0.5 part by weight of furnace black was added, and
After kneading at 0 ° C. for 10 minutes, a cylindrical pellet having a diameter of 3 mm and a height of 3 mm was obtained. Next, 2.5 parts by weight of dicumyl peroxide, which is an organic peroxide, was added to the pellet, and the mixture was slowly stirred at 70 ° C. for 5 hours to uniformly impregnate the organic peroxide into the inside of the pellet,
A resin composition for a jacket layer was prepared.
【００２５】（Ｄ）コモン三層押出装置の準備 ダイプレートに５００メッシュ以上のスクリーンパック
を設置した３台の押出機を準備し、これらを連結するこ
とにより、内部半導電層押出機、絶縁層押出機およびジ
ャケット層押出機となるように順次配置したコモン三層
クロスヘッドを有する押出装置とした。(D) Preparation of Common Three-Layer Extrusion Apparatus Three extruders having a screen pack of 500 mesh or more on a die plate are prepared, and these are connected to form an internal semiconductive layer extruder and an insulating layer. The extruder had a common three-layer crosshead sequentially arranged so as to be an extruder and a jacket layer extruder.
【００２６】（Ｅ）屋外用架橋ポリエチレン絶縁電線の
製造 上記（Ａ）〜（Ｃ）に準備した内部半導電層用樹脂組成
物、架橋ポリエチレン絶縁層用樹脂組成物及びジャケッ
ト層用樹脂組成物を、上記（Ｄ）のコモン三層押出装置
のそれぞれの押出機に供給した。これらの樹脂組成物
を、内部半導電層押出機では、２００℃で、絶縁層押出
機では、１３０℃で、ジャケット層用樹脂押出機では、
１４０℃で加熱混練したのち、それぞれコモン三層クロ
スヘッドのダイスより硬銅導体上に、内部半導電層の厚
さが１ｍｍ、絶縁層の厚さが２．５ｍｍ、ジャケット層
の厚さが２．５ｍｍとなるように、同時に押出した。次
いでその下流に位置する架橋管で２３０℃に加熱するこ
とにより、架橋反応を行い、導体上に内側から内部半導
電層、架橋ポリエチレン絶縁層及びジャケット層が被覆
された屋外用架橋ポリエチレン絶縁電線を得た。この絶
縁電線の各層の架橋度（ゲル分率）を測定したところ、
内部半導電層、絶縁層及びジャケット層は、それぞれ７
６％、８２％、８０％であり、各層の界面では、メルト
フラクチャーによる不整は認められなかった。また、水
トリー発生試験を行ったところ、水トリーは全く発生し
なく、この屋外用架橋ポリエチレン絶縁電線は長寿命で
あった。(E) Production of crosslinked polyethylene insulated wire for outdoor use The resin composition for the internal semiconductive layer, the resin composition for the crosslinked polyethylene insulating layer and the resin composition for the jacket layer prepared in the above (A) to (C) are prepared. And supplied to each extruder of the common three-layer extruder of the above (D). These resin compositions are prepared at 200 ° C. in the internal semiconductive layer extruder, at 130 ° C. in the insulating layer extruder, and at 130 ° C. in the jacket layer resin extruder.
After heating and kneading at 140 ° C., the thickness of the inner semiconductive layer was 1 mm, the thickness of the insulating layer was 2.5 mm, and the thickness of the jacket layer was 2 mm on the hard copper conductor from the dice of the common three-layer crosshead. Extruded simultaneously to a thickness of 0.5 mm. Next, by heating to 230 ° C. with a cross-linking pipe located downstream thereof, a cross-linking reaction is performed, and an outdoor cross-linked polyethylene insulated wire having a conductor coated with an internal semiconductive layer, a cross-linked polyethylene insulating layer and a jacket layer from the inside is formed. Obtained. When the degree of crosslinking (gel fraction) of each layer of this insulated wire was measured,
The inner semiconductive layer, the insulating layer and the jacket layer each have a thickness of 7
6%, 82%, and 80%, and no irregularity due to melt fracture was observed at the interface between the layers. Further, when a water tree generation test was performed, no water tree was generated, and the outdoor cross-linked polyethylene insulated wire had a long life.
【００２７】［実施例２］実施例１において架橋ポリエ
チレン絶縁層用樹脂組成物に配合するポリエチレングリ
コールを分子量が１,０００のものに代え、配合量も
０．２重量部とした以外は、実施例１と同様な実験を行
った。水トリー発生試験を行ったところ、水トリーの発
生は認められなかった。Example 2 The procedure of Example 1 was repeated except that the polyethylene glycol used in the resin composition for the crosslinked polyethylene insulating layer was changed to that having a molecular weight of 1,000 and the amount used was 0.2 parts by weight. The same experiment as in Example 1 was performed. When a water tree generation test was performed, generation of water trees was not recognized.
【００２８】［実施例３］実施例１において架橋ポリエ
チレン絶縁層用樹脂組成物に配合するポリエチレングリ
コールを分子量が２０，０００のものに代え、配合量も
１０重量部とした以外は、実施例１と同様な実験を行っ
た。水トリー発生試験を行ったところ、水トリーの発生
は認められなかった。Example 3 Example 1 was repeated except that the polyethylene glycol used in the resin composition for a crosslinked polyethylene insulating layer was changed to that having a molecular weight of 20,000 and the compounding amount was changed to 10 parts by weight. The same experiment was performed. When a water tree generation test was performed, generation of water trees was not recognized.
【００２９】［比較例１］実施例１において架橋ポリエ
チレン絶縁層用樹脂組成物に配合するポリエチレングリ
コールの配合量を０．１重量部とした以外は、実施例１
と同様な実験を行った。水トリー発生試験を行ったとこ
ろ、試験片の１２ヶ所の測定点（円錐形状凹部）のう
ち、２ヶ所で水トリーが発生し、平均水トリー長さは１
８μｍであった。Comparative Example 1 The procedure of Example 1 was repeated except that the amount of the polyethylene glycol was 0.1 part by weight.
The same experiment was performed. When the water tree generation test was performed, water trees were generated at two points out of 12 measurement points (conical concave portions) on the test piece, and the average water tree length was 1
It was 8 μm.
【００３０】［比較例２］実施例１において架橋ポリエ
チレン絶縁層用樹脂組成物に配合するポリエチレングリ
コールの配合量を１２重量部とした以外は、実施例１と
同様な実験を行った。絶縁層の電気特性（ｔａｎδ）が
悪化し、望ましくなかった。Comparative Example 2 The same experiment as in Example 1 was conducted, except that the amount of polyethylene glycol to be added to the resin composition for a crosslinked polyethylene insulating layer was changed to 12 parts by weight. The electrical characteristics (tan δ) of the insulating layer deteriorated, which was not desirable.
【００３１】［比較例３］実施例１において架橋ポリエ
チレン絶縁層用樹脂組成物に配合するポリエチレングリ
コールを分子量が９００のものに代えた以外は、実施例
１と同様な実験を行った。ポリエチレンと均一に配合で
きず、絶縁特性が悪くなり、望ましくなかった。Comparative Example 3 An experiment was conducted in the same manner as in Example 1 except that the polyethylene glycol used in the resin composition for a crosslinked polyethylene insulating layer was changed to that having a molecular weight of 900. It could not be blended uniformly with polyethylene, resulting in poor insulation properties, which was not desirable.
【００３２】［比較例４］実施例１において架橋ポリエ
チレン絶縁層用樹脂組成物に配合するポリエチレングリ
コールを分子量が２５，０００のものに代えた以外は、
実施例１と同様な実験を行った。ポリエチレンに均一に
分散できず、絶縁特性が悪くなり、望ましくなかった。Comparative Example 4 The procedure of Example 1 was repeated except that the polyethylene glycol used in the resin composition for the crosslinked polyethylene insulating layer was changed to a polyethylene glycol having a molecular weight of 25,000.
The same experiment as in Example 1 was performed. It could not be uniformly dispersed in polyethylene, resulting in poor insulation properties, which was not desirable.
【００３３】［比較例５］実施例１においてジャケット
層用樹脂組成物に配合するファーネスブラックの配合量
を０．０５重量部とした以外は、実施例１と同様な実験
を行った。ジャケット層の耐候性が悪くなり、望ましく
なかった。Comparative Example 5 An experiment was conducted in the same manner as in Example 1 except that the amount of furnace black to be added to the resin composition for the jacket layer was changed to 0.05 part by weight. The jacket layer had poor weather resistance, which was not desirable.
【００３４】［比較例６］実施例１においてジャケット
層用樹脂組成物に配合するファーネスブラックの配合量
を２．１重量部とした以外は、実施例１と同様な実験を
行った。ジャケット層の耐トラッキング性が悪くなり、
望ましくなかった。Comparative Example 6 An experiment was conducted in the same manner as in Example 1 except that the amount of the furnace black to be added to the resin composition for the jacket layer was changed to 2.1 parts by weight. The tracking resistance of the jacket layer deteriorates,
Not desirable.
【００３５】なお、水トリー発生試験は、下記の方法に
よって行った。 （１）試験片の調整 実施例１の架橋ポリエチレン絶縁層用樹脂組成物を圧縮
成形によって底部に１２個の逆円錐形凹部を有する皿状
体を調製し、次いでこれを所定の温度で加熱架橋させて
試験片を作製する。試験片の断面及び寸法を図１に示
す。（２）試験装置 前記皿状試験片に０．０１規定食塩水を満たし、さらに
該試験片の底部を同じく０．０１規定食塩水に浸漬す
る。試験片内外の食塩水に白金線を通じて課電する。浸
漬課電装置の外観を図２に示す。 （３）トリーの発生と観察 ５ＫＶ、５ＫＨｚの交番電圧を４８時間印加した後、試
験片の円錐形凹部の頂点から発生する水トリーの有無を
光学顕微鏡を用いて観察し、水トリーの長さを測定す
る。観察を容易にするために、試験片の円錐形凹部の頂
点附近を円錐軸方向に沿って薄くスライスし、このスラ
イス片をメチレンブルー水溶液中で煮沸染色する。The water tree generation test was performed by the following method. (1) Preparation of Test Specimen The resin composition for a crosslinked polyethylene insulating layer of Example 1 was compression-molded to prepare a dish having 12 inverted conical concave portions at the bottom, and then heated and crosslinked at a predetermined temperature. Then, a test piece is prepared. FIG. 1 shows the cross section and dimensions of the test piece. (2) Test Apparatus The dish-shaped test piece is filled with 0.01N saline, and the bottom of the test piece is immersed in the same 0.01N saline. A saline solution inside and outside the test piece is charged through a platinum wire. FIG. 2 shows the appearance of the immersion charging device. (3) Generation and Observation of Tree After applying an alternating voltage of 5 KV and 5 KHz for 48 hours, the presence or absence of a water tree generated from the apex of the conical concave portion of the test piece was observed using an optical microscope, and the length of the water tree was measured. Is measured. For easy observation, the vicinity of the apex of the conical concave portion of the test piece is thinly sliced along the direction of the conical axis, and the sliced piece is subjected to boiling dyeing in an aqueous methylene blue solution.
【００３６】[0036]
【発明の効果】本発明の屋外用架橋ポリエチレン絶縁電
線は、架橋ポリエチレン絶縁層に高分子量のポリエチレ
ングリコールが配合されていることにより、浸水課電状
態で使用した場合でも、水トリーの発生がなく、従来の
ものに比べて高品質で長寿命である効果がある。The outdoor cross-linked polyethylene insulated wire of the present invention has no water tree even when used in a flooded state because the cross-linked polyethylene insulating layer contains high-molecular-weight polyethylene glycol. This has the effect of higher quality and longer life than conventional ones.
【図１】圧縮成形法によって製作した試験片の形状と寸
法を示す断面図。FIG. 1 is a sectional view showing the shape and dimensions of a test piece manufactured by a compression molding method.
【図２】試験装置の傾斜図。FIG. 2 is a perspective view of a test apparatus.
【図３】試験中の状態を示す試験片の一部拡大図。FIG. 3 is a partially enlarged view of a test piece showing a state during a test.
１ 透明試験槽 ２ 高圧電源への電線 ３ ポリエチレン蓋 ４ 透明容器 ５ 白金線電極 ６ 試験片 ７ 設地線 ８ 電解質水溶液 ９ 水トリーの形状 DESCRIPTION OF SYMBOLS 1 Transparent test tank 2 Electric wire to high voltage power supply 3 Polyethylene lid 4 Transparent container 5 Platinum wire electrode 6 Test piece 7 Ground wire 8 Electrolyte aqueous solution 9 Water tree shape
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ (Ｃ０８Ｌ 23/04 71:02） ──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. 6 Identification code FI (C08L 23/04 71:02)
Claims (4)
橋ポリエチレン絶縁層用樹脂組成物及びジャケット層用
樹脂組成物を順次被覆する工程と、加熱架橋を行う工程
からなる屋外用架橋ポリエチレン絶縁電線の製造方法に
おいて、（Ａ）該内部半導電層用樹脂組成物がポリエチ
レン系共重合体１００重量部と、導電性カーボンブラッ
ク８〜１００重量部を含むこと、（Ｂ）該架橋ポリエチ
レン絶縁層用樹脂組成物がポリエチレン系樹脂１００重
量部と、有機過酸化物０．１〜５重量部と、分子量１，
０００〜２０，０００の高分子量ポリエチレングリコー
ル０．２〜１０重量部を含むこと、及び（Ｃ）該ジャケ
ット層用樹脂組成物がポリエチレン系樹脂１００重量部
と、導電性カーボンブラック０．１〜２．０重量部を含
むこと、を特徴とする屋外用架橋ポリエチレン絶縁電線
の製造方法。1. A crosslinked outdoor polyethylene comprising a step of sequentially coating a resin composition for an internal semiconductive layer, a resin composition for a crosslinked polyethylene insulating layer and a resin composition for a jacket layer on a conductor, and a step of performing heat crosslinking. In the method for producing an insulated wire, (A) the resin composition for an internal semiconductive layer contains 100 parts by weight of a polyethylene-based copolymer and 8 to 100 parts by weight of conductive carbon black; The resin composition for a layer comprises 100 parts by weight of a polyethylene resin, 0.1 to 5 parts by weight of an organic peroxide, and a molecular weight of 1,
(C) the resin composition for a jacket layer contains 100 parts by weight of a polyethylene resin and 0.1 to 2 parts of a conductive carbon black. The method for producing a crosslinked polyethylene insulated wire for outdoor use according to any one of the preceding claims.
量１，０００〜２０，０００の高分子量ポリエチレング
リコール０．２〜１０重量部を含むことを特徴とする請
求項１に記載の屋外用架橋ポリエチレン絶縁電線の製造
方法。2. The outdoor device according to claim 1, wherein the resin composition for an internal semiconductive layer further comprises 0.2 to 10 parts by weight of a high molecular weight polyethylene glycol having a molecular weight of 1,000 to 20,000. For manufacturing cross-linked polyethylene insulated wires.
橋ポリエチレン絶縁層用樹脂組成物及びジャケット層用
樹脂組成物を順次被覆する工程がコモン三層押出機によ
り行われることを特徴とする請求項１に記載の屋外用架
橋ポリエチレン絶縁電線の製造方法。3. The step of sequentially coating a resin composition for an internal semiconductive layer, a resin composition for a cross-linked polyethylene insulating layer, and a resin composition for a jacket layer on a conductor is performed by a common three-layer extruder. The method for producing an outdoor crosslinked polyethylene insulated wire according to claim 1.
記載の製造方法により製造されることを特徴とする屋外
用架橋ポリエチレン絶縁電線。4. A crosslinked polyethylene insulated wire for outdoor use, which is manufactured by the manufacturing method according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14595697A JPH10321056A (en) | 1997-05-20 | 1997-05-20 | Cross-linked polyethylene insulated wire outdoor use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14595697A JPH10321056A (en) | 1997-05-20 | 1997-05-20 | Cross-linked polyethylene insulated wire outdoor use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10321056A true JPH10321056A (en) | 1998-12-04 |
Family
ID=15396929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14595697A Pending JPH10321056A (en) | 1997-05-20 | 1997-05-20 | Cross-linked polyethylene insulated wire outdoor use |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10321056A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012103158A (en) * | 2010-11-11 | 2012-05-31 | Toshiba Mitsubishi-Electric Industrial System Corp | Method for water treeing test, test piece for water treeing test, and method for manufacturing the same |
| JP2013515134A (en) * | 2009-12-21 | 2013-05-02 | ユニオン カーバイド ケミカルズ アンド プラスティックス テクノロジー エルエルシー | Insulation for medium voltage cables |
| WO2015040656A1 (en) * | 2013-09-20 | 2015-03-26 | 東芝三菱電機産業システム株式会社 | Water-tree resistance evaluation method, insulation design method, and rotary electric machine |
| JP2015093873A (en) * | 2013-11-08 | 2015-05-18 | 矢崎総業株式会社 | Polyolefin-based resin composition and coated electric wire using the same |
-
1997
- 1997-05-20 JP JP14595697A patent/JPH10321056A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013515134A (en) * | 2009-12-21 | 2013-05-02 | ユニオン カーバイド ケミカルズ アンド プラスティックス テクノロジー エルエルシー | Insulation for medium voltage cables |
| JP2012103158A (en) * | 2010-11-11 | 2012-05-31 | Toshiba Mitsubishi-Electric Industrial System Corp | Method for water treeing test, test piece for water treeing test, and method for manufacturing the same |
| WO2015040656A1 (en) * | 2013-09-20 | 2015-03-26 | 東芝三菱電機産業システム株式会社 | Water-tree resistance evaluation method, insulation design method, and rotary electric machine |
| JPWO2015040656A1 (en) * | 2013-09-20 | 2017-03-02 | 東芝三菱電機産業システム株式会社 | Water-resistant tree evaluation method, insulation design method, and rotating electric machine |
| US10175289B2 (en) | 2013-09-20 | 2019-01-08 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Water-tree resistance evaluation method, insulation design method, and rotary electric machine |
| JP2015093873A (en) * | 2013-11-08 | 2015-05-18 | 矢崎総業株式会社 | Polyolefin-based resin composition and coated electric wire using the same |
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