JP2004095338A - Corrosion-protected wire - Google Patents

Corrosion-protected wire Download PDF

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JP2004095338A
JP2004095338A JP2002254861A JP2002254861A JP2004095338A JP 2004095338 A JP2004095338 A JP 2004095338A JP 2002254861 A JP2002254861 A JP 2002254861A JP 2002254861 A JP2002254861 A JP 2002254861A JP 2004095338 A JP2004095338 A JP 2004095338A
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Japan
Prior art keywords
grease
wire
mass
anticorrosion
corrosion
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JP3974000B2 (en
Inventor
Koichi Iinuma
飯沼 浩一
Akira Yoshino
吉野 明
Yutaka Nagata
永田 豊
Yuji Asano
浅野 祐二
Toshiji Yokoya
横谷 年二
Mitsuru Komachi
小町 満
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NIPPON KOYU KK
Fujikura Ltd
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NIPPON KOYU KK
Fujikura Ltd
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Priority to CN 03156445 priority patent/CN1260740C/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a corrosion-protected wire where the drooping at high temperatures is prevented, cold resistance is excellent, and corrosion resistance can be maintained for a long term. <P>SOLUTION: In the corrosion-protected wire, grease in which 5-50 pts.mass of a thickening agent having a dropping point of ≥220°C and 0.01-10 pts.mass of an oxidation inhibitor are mixed into 100 pts.mass of a base oil containing polybutene of 30-50000 mm<SP>2</SP>/s in kinematic viscosity at 100°C and 20-1000 mm<SP>2</SP>/s in kinematic viscosity at 40°C as a main component is applied and/or filled. As a result, the degradation of corrosion resistance, which is caused by the drooping at high temperatures or the crack under cold conditions, is restrained to provide extremely high corrosion resistance. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、架空送電線、架空地線、光ファイバ複合架空地線等の電線に用いられる防食電線用グリースおよびそれを用いた防食電線に関する。
【0002】
【従来の技術】
この種の架空電線には、テンションメンバとなる亜鉛メッキ鋼線やアルミニウム覆鋼線(以下、「亜鉛メッキ鋼線等」ということがある)の単線あるいは撚線を中心として、これの周囲に良導体である多数の硬アルミニウム線またはアルミニウム合金線(以下、単に「アルミニウム線」ということがある)を1層または複数層、同心円状に撚り合わせた複合撚線(ACSR)が使用されている。
このようなACSRタイプの架空送電線の場合、強い日差しや風雪雨などの自然環境下に曝されても、中心線材部分が防食処理された亜鉛メッキ鋼線やアルミニウム被覆鋼線であって、また、この中心線材の周囲に撚り合わされる線材も耐食性の高いアルミニウム線やその合金線であるため、通常の環境下では、十分な耐食性を呈する。
【0003】
しかし、海洋に近い地域、工業地帯などの大気汚染のひどい地域等では、塩分や酸性物質等の腐食性物質が大気中に多く存在し、それが電線を腐食するので、電線の寿命が著しく短くなることが知られている。このため、このような腐食性の高い環境下で使用される架空電線では、その表面にグリースを塗布または充填して電線の表面を被覆し、外気から遮断することが行われている。
一般に、グリースを塗布または充填した電線は、防食電線と呼ばれている。
【0004】
【発明が解決しようとする課題】
しかしながら、このような防食電線であっても、長期間に亘る使用の間に、通電による発熱のため、グリースが熱劣化して、グリースが垂れ落ちることがあった。また、寒冷条件で、ひび割れが生じることがあった。垂れ落ちやひび割れのため、防食性能が低下し、問題となっていた。
【0005】
よって、本発明における課題は、高温で垂れ落ちにくく、耐寒性に優れ、防食性を長期間維持することが可能な防食電線を得ることにある。
【0006】
【課題を解決するための手段】
かかる課題は、主成分として、40℃における動粘度が30〜50000mm/s、100℃における動粘度が20〜1000mm/sであるポリブテンを含有する基油100質量部に対して、グリースの滴点が220℃以上となる増ちょう剤を5〜50質量部、酸化防止剤を0.01〜10質量部配合したグリースを塗布および/または充填した防食電線によって解決される。
【0007】
【発明の実施の形態】
以下、実施の形態に基づいて、本発明を詳しく説明する。
本発明の防食電線に塗布および/または充填されるグリースは、基油が、主成分として、40℃における動粘度が30〜50000mm/s、100℃における動粘度が20〜1000mm/sであるポリブテンを含有するものであり、このような基油100質量部に対して、グリースの滴点が220℃以上となる増ちょう剤を5〜50質量部、酸化防止剤を0.01〜10質量部配合したグリースである。
【0008】
ポリブテンは、ブテン類(イソブチレン、1−ブテン等)の重合によって得られる液状の低重合体であり、炭化水素の主鎖からなるため、電気絶縁性、化学的安定性に優れるとともに、熱や光に対しても安定であり、耐水性、撥水性、耐候性、耐老化性等に優れている。また、不純物やワックス分、揮発油分が極めて少ないので、耐熱性に優れ、低い流動点を呈するため、防食電線としての耐熱性、耐寒性を高くすることができる。また、粘着性や付着性に富み、高温においても、電線からの垂れ落ちを抑制することができる。
このようなポリブテンとしては、市販のものから適宜選択して用いることができ、例えば、新日本石油化学株式会社の日石ポリブテンシリーズ(商品名:HV−15、HV−35、HV−54、HV−110、HV−300等)、出光石油化学株式会社の出光ポリブテンシリーズ(商品名:100H、300H、2000H、35R、100R、300R等)、日本油脂株式会社のニッサンポリブテンシリーズ(商品名:3N、5N、10N等)などを好適に使用することができる。
【0009】
さらに、ポリブテンの粘度としては、40℃における動粘度が30〜50000mm/s、100℃における動粘度が20〜1000mm/sとされる。
動粘度が前記下限値より低いと、電線に塗布して敷設した後に、通電による発熱のため、基油成分の蒸発が多くなり、グリースが防食電線の防食性能が低下するおそれがある。また、動粘度が前記上限値より高いと、グリースの圧送性やハンドリングに劣り、電線への塗布や充填が困難になるので、好ましくない。
【0010】
本発明の防食電線に用いられるグリースの基油としては、上述のポリブテンを主成分とするものであれば、鉱油(ナフテン系、パラフィン系)、合成油など、他の種類の油を50重量%未満混合したものを用いることができる。より好ましくは、ポリブテンを80重量%以上含有するものとし、さらに好ましくは、ポリブテンを95重量%以上含有するものとすることが好ましい。
【0011】
増ちょう剤としては、グリースの耐熱性、耐垂れ落ち性などの観点から、グリースの滴点が220℃以上となる種類のものが用いられる。このような増ちょう剤としては、金属複合せっけん、有機化ベントナイトやシリカゲルなどの無機系増ちょう剤、ポリウレアなどのウレア化合物、ポリテトラフルオロエチレンなどの高分子系増ちょう剤などのうちの1種または2種以上の混合物が挙げられる。
【0012】
有機化ベントナイトとは、モンモリロナイト等の粘土鉱物を主成分とするベントナイト系粘土の表面に、四級アンモニウムカチオンの塩類等を吸着させて疎水化したものである。すなわち、四級アンモニウムカチオンが粘土鉱物の層状ケイ酸塩構造の間に侵入して形成される層間化合物であり、有機溶剤に対して優れた分散性を示し、基油との混和により膨潤して、増粘性、チキソトロピー性を呈する。
ベントナイトの表面処理剤として、アニオン系ポリマーやシラン系処理剤を用いた場合、ベントナイトの疎水化が十分に行われず、親水性が高くなるので、増ちょう剤として不適である。但し、四級アンモニウムカチオンなどを吸着させて疎水化した後、シラン系処理剤を用いることは好ましい。
【0013】
金属複合せっけんは、長鎖脂肪酸の金属塩に、酢酸、乳酸、アジピン酸、ジアルキルリン酸などの他の酸の金属塩を複合させたものである。金属としては、リチウム、アルミニウム、カルシウム、バリウムなどが例示できる。
これらの複合せっけんに用いる長鎖脂肪酸としては、特に、12−ヒドロキシステアリン酸など、分子内に水酸基を有するものを用いると、ロール掛けによってグリースのチキソトロピー性を大きくすることができるので、特に好ましい。
【0014】
上述の増ちょう剤は、いずれも、耐熱性、耐水性に優れるとともに、増粘性が高いので、チクソトロピー(揺変性)の高いグリースを得ることができる。このため、電線への塗布性に優れるとともに、架設後の垂れ落ちや、通電時の発熱による熱劣化を効果的に抑制することができ、防食電線用グリースとして優れた性質を発揮する。
特に、有機化ベントナイトは、イオン交換作用を有するので、金属イオンなどを吸着することができ、また、酸などの腐食性物質と反応せず、変質や軟化を起こしにくいことから、特に好ましい。
【0015】
基油と増ちょう剤との配合比は、基油100質量部に対して、増ちょう剤を5〜50質量部配合し、得られるグリースのちょう度が180〜340になるように調整するのが好ましい。ちょう度が180未満の場合、得られるグリースが非常に硬くなり、塗布性が低下する。また、340を超えると、得られるグリースが軟化し、流動しやすくなるので好ましくない。
【0016】
本発明の防食電線用グリースには、高温熱酸化によるグリースの変質を抑制するため、基油100質量部に対して、酸化防止剤が0.01〜10質量部の範囲内で添加される。酸化防止剤としては、フェノール系、アミン系、リン系などのものを用いることができるが、特に、フェノール系、アミン系のものが好ましい。
さらに、本発明の効果を妨げない範囲で、必要に応じて、金属不活性化剤、炭酸カルシウム等の受酸剤、カーボンなどの耐候剤など、他の添加剤を適当量配合してもよい。また、基油の粘度が比較的低いもの(例えば、40℃における動粘度が40mm/s程度であるものなど)には、電線への付着性を向上させるため、増粘剤を、基油100質量部に対して、5〜60質量部添加することができる。増粘剤としては、低温での柔軟性に優れるものが好適に用いられ、ポリイソブチレン、オレフィンコポリマー(OCP)、ポリメタクリレート、石油系ロジン等の石油系樹脂などが例示される。
【0017】
グリースの製造は、原料に応じて選択されるけん化法、混合法などの適切な方法により行うことができる。
例えば、金属複合石けんを増ちょう剤とするグリースでは、基油中、常圧または加圧下にて油脂類と金属塩基類を加熱してけん化させ、冷却後、各種添加剤などを添加し、必要に応じて加熱した後、混合し、ミーリングによって均一化して、ろ過、脱泡を行うことにより、グリースを製造することができる。
また、有機化ベントナイトを増ちょう剤とするグリースでは、基油と有機化ベントナイトを混合釜に入れ、メタノールなどの膨潤剤を添加して有機化ベントナイトを膨潤させたのち混合し、各種添加剤などを添加し、必要に応じて加熱した後、混合し、ミーリングによって均一化して、ろ過、脱泡を行うことにより、グリースを製造することができる。
【0018】
グリースの電線(撚線)への充填は、複数の素線を撚り合わせて電線を製造する際に、各素線間にグリースを詰め込みながら撚り合わせることにより、行うことができる。また、グリースの塗布は、該電線の外周表面に対して、適宜の塗布手段によって行われる。グリースの塗布厚は、電線が露出しない程度とすればよい。
防食性の観点から、グリースを電線の素線間に充填するとともに、電線の外周に塗布することが好ましいが、環境条件があまり厳しくない場合は、充填のみを行ってもよい。電線が単線または撚りが緻密な撚線である場合には、塗布のみを行う。
このようにして製造された防食電線は、架空送電線、架空地線などの架空電線のほか、ジャンパ線や変電所内の母線などにも適用可能である。
【0019】
以下、具体例を示す。表1に示す組成の防食電線用グリースを調製した。
用いた基油の性質は、以下のとおりである。
ポリブテンA:動粘度は、40℃において645mm/s、100℃において28mm/s。
ポリブテンB:動粘度は、40℃において9600mm/s、100℃において220mm/s。
ポリブテンC:動粘度は、40℃において37000mm/s、100℃において850mm/s。
ポリブテンD:動粘度は、40℃において205mm/s、100℃において14mm/s。
ポリブテンE:動粘度は、40℃において170000mm/s、100℃において3100mm/s。
鉱油:動粘度は、40℃において100mm/s、100℃において10mm/s。
【0020】
用いた添加剤は、以下のとおりである。
酸化防止剤としては、フェノール系のペンタエリスリトール−テトラキス[3−(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)プロピオネート]を用いた。
増粘剤としては、ポリイソブチレン(粘度平均分子量40000、流動点77.5)を用いた。
【0021】
次いで、得られた各防食電線用グリースについて、以下に示す評価試験を行い、特性を評価した。
〔ちょう度〕
グリースのちょう度は、JIS K 2200の5.3に記載の方法により測定した。防食電線用グリースにおいて、ちょう度の望ましい範囲は180〜340である。
〔滴点〕
グリースの滴点は、JIS K 2200の5.4に記載の方法により測定し、220℃の場合を「○」とし、220℃未満を「×」として評価した。
〔塗布性〕
グリースをアルミニウム送電線(ACSR)に塗布、充填したときに、注入性が良く、電線からの剥がれ落ちを起こさなかったものを「○」とし、グリースの付着性が弱く、剥がれ落ちを起こした場合を「×」として評価した。
【0022】
〔高温での垂れ落ち性〕
グリースを、アルミニウム送電線(200mm撚線)の素線間に充填し、かつ撚線の表面に塗布して、防食電線を製造した。これを150℃、200時間放置し、グリースの垂れ落ちの生じないものを「◎」、塗布量に対する垂れ落ち量が3%未満のものを「○」、塗布量に対する垂れ落ち量が3%以上のものを「×」として評価した。
【0023】
〔耐寒性〕
幅50mm、厚さ0.5mmの金属板(SUS板)の片面に、グリースを0.5mmの厚さにて塗布して試料を作製し、これを、−30℃の恒温槽に1時間放置した。試料を恒温槽から取り出して直ちに、グリース塗布面を外側に向けて、半径80mmのマンドレルに当接させ、このマンドレルの外周面に沿って試料を湾曲させた。このとき、グリース塗布面を目視で観測し、亀裂が全く観測されなかった場合を「◎」、僅かな亀裂が観測された場合を「○」、かなりの亀裂や剥離が生じた場合を「×」として評価した。
【0024】
〔防食性能〕
厚さ1mmのアルミニウム板の表面に、グリースを0.08mmの厚さにて塗布して試料を作製し、これを濃度6mol/lの塩酸を入れたデシケータ内に30日間放置した。デシケータから試料を取り出し、グリースを除去したのち、アルミニウム板の表面粗さを測定した。このとき、平均表面粗さが2μm以下の場合を「○」、2μmを超えた場合を「×」として評価した。
【0025】
これらの評価試験の結果を表1、表2に示す。
【0026】
【表1】

Figure 2004095338
【0027】
【表2】
Figure 2004095338
【0028】
以上の結果から明らかなように、実施例の防食電線は、いずれも、ちょう度が適度な範囲にあり、塗布性、垂れ落ち性、耐寒性、防食性能の試験にも合格した。
基油中のポリブテンの配合比が100%である実施例1〜6の防食電線は、高温での垂れ落ち性、耐寒性ともに極めて優れていた。
基油中のポリブテンの配合比が95%である実施例7の防食電線は、耐寒性試験で僅かな亀裂が認められたものの、実用上問題なく、高温での垂れ落ち性は極めて優れていた。
基油中のポリブテンの配合比が80%である実施例8の防食電線は、高温での垂れ落ちが僅かであり、耐寒性試験で僅かな亀裂が認められたものの、実用上問題なく、優れた防食性能を示した。
【0029】
これに対して、ポリブテンの100℃における粘度が低く、増ちょう剤の配合比が過少である比較例1の防食電線では、ちょう度が大きく、高温での垂れ落ち性が劣っていた。
ポリブテンの粘度が高い比較例2の防食電線では、塗布性が劣っていた。
基油として鉱油を用いた比較例3、および、ポリブテンの配合比が少ない比較例4の防食電線は、鉱油中のワックス分のため、寒冷条件で流動が低下し、耐寒性試験において不合格となった。
酸化防止剤を添加しない比較例5の防食電線は、ちょう度は適度な範囲内にあったが、高温での変質のため、高温で垂れ落ちがかなりあった。
増ちょう剤としてAl石けんを用いた比較例6の防食電線は、滴点が低く、温度上昇により流動性が増したため、高温での垂れ落ち性において不合格となった。
増ちょう剤の配合比が過多である比較例7の防食電線では、ちょう度が小さく、塗布が困難であった。
酸化防止剤の配合比が過多である比較例8の防食電線、および、増ちょう剤として炭酸カルシウムを添加した比較例9の防食電線では、防食性能が低くなり、不合格となった。
【0030】
【発明の効果】
以上説明したように、本発明の防食電線は、主成分として、40℃における動粘度が30〜50000mm/s、100℃における動粘度が20〜1000mm/sであるポリブテンを含有する基油100質量部に対して、グリースの滴点が220℃以上となる増ちょう剤を5〜50質量部、酸化防止剤を0.01〜10質量部配合したグリースを塗布および/または充填したものであるので、高温での垂れ落ちや、寒冷条件でのひび割れなどによる防食性の低下が抑制され、防食性が極めて高いものとなる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a grease for an anticorrosion electric wire used for electric wires such as an overhead power transmission line, an overhead ground wire, and an optical fiber composite overhead ground wire, and an anticorrosion wire using the same.
[0002]
[Prior art]
This type of overhead electric wire mainly includes a single wire or a stranded wire of a galvanized steel wire or an aluminum covered steel wire (hereinafter, sometimes referred to as “galvanized steel wire, etc.”) as a tension member, and a good conductor around the wire. A composite twisted wire (ACSR) in which a number of hard aluminum wires or aluminum alloy wires (hereinafter, sometimes simply referred to as “aluminum wires”) are concentrically twisted in one or more layers.
In the case of such an ACSR-type overhead power transmission line, even if it is exposed to a natural environment such as strong sunshine or wind and snow, the center wire portion is a galvanized steel wire or an aluminum-coated steel wire whose anticorrosion treatment has been performed. Since the wire twisted around the center wire is also a highly corrosion-resistant aluminum wire or its alloy wire, it exhibits sufficient corrosion resistance under a normal environment.
[0003]
However, in areas near the ocean, in areas with severe air pollution such as industrial areas, etc., there are many corrosive substances such as salts and acidic substances in the atmosphere, which corrode the electric wires, and the life of the electric wires is extremely short. It is known to be. For this reason, in the case of an overhead electric wire used in such a highly corrosive environment, grease is applied or filled on the surface to coat the surface of the electric wire and to shield the surface from the outside air.
Generally, an electric wire coated or filled with grease is called an anticorrosion electric wire.
[0004]
[Problems to be solved by the invention]
However, even with such an anticorrosion wire, during use for a long period of time, the grease may be thermally degraded due to heat generation due to energization, and the grease may drop. In addition, cracks sometimes occurred under cold conditions. Due to dripping and cracking, the anticorrosion performance was reduced, which was a problem.
[0005]
Therefore, an object of the present invention is to provide an anticorrosion wire that is hard to sag at high temperatures, has excellent cold resistance, and can maintain anticorrosion for a long period of time.
[0006]
[Means for Solving the Problems]
The problem is that the grease is added to 100 parts by mass of a base oil containing, as a main component, a polybutene having a kinematic viscosity at 40 ° C of 30 to 50000 mm 2 / s and a kinematic viscosity at 100 ° C of 20 to 1000 mm 2 / s. The problem is solved by an anticorrosion wire coated and / or filled with grease containing 5 to 50 parts by mass of a thickener and 0.01 to 10 parts by mass of an antioxidant whose drop point is 220 ° C. or higher.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments.
Grease applied and / or filled in anticorrosive wire of the present invention, base oil, as a main component, a kinematic viscosity at 40 ° C. is the kinematic viscosity at 30~50000mm 2 / s, 100 ℃ in 20~1000mm 2 / s 5 to 50 parts by mass of a thickener having a grease drop point of 220 ° C. or more, and 0.01 to 10 parts by mass of an antioxidant, based on 100 parts by mass of such a base oil. It is a grease blended in parts by mass.
[0008]
Polybutene is a liquid low polymer obtained by polymerization of butenes (isobutylene, 1-butene, etc.), and is composed of a hydrocarbon main chain, so that it has excellent electrical insulation properties and chemical stability, and also has heat and light. And is excellent in water resistance, water repellency, weather resistance, aging resistance and the like. Further, since the content of impurities, wax, and volatile oil is extremely small, it has excellent heat resistance and exhibits a low pour point, so that heat resistance and cold resistance as a corrosion-resistant electric wire can be increased. In addition, it is rich in adhesiveness and adhesion, and can suppress dripping from the electric wire even at a high temperature.
Such a polybutene can be appropriately selected from commercially available ones, for example, Nisseki Polybutene Series (trade names: HV-15, HV-35, HV-54, HV) of Nippon Petrochemical Co., Ltd. -110, HV-300, etc.), Idemitsu Polybutene Series of Idemitsu Petrochemical Co., Ltd. (trade name: 100H, 300H, 2000H, 35R, 100R, 300R, etc.), Nissan Polybutene Series of Nihon Yushi Co., Ltd. (trade name: 3N, 5N, 10N, etc.) can be suitably used.
[0009]
Further, as the viscosity of polybutene, the kinematic viscosity at 40 ° C. is 30 to 50000 mm 2 / s, and the kinematic viscosity at 100 ° C. is 20 to 1000 mm 2 / s.
If the kinematic viscosity is lower than the lower limit, the base oil component is more likely to evaporate due to heat generated by energization after coating and laying on the electric wire, and the grease may reduce the anticorrosion performance of the anticorrosive electric wire. On the other hand, if the kinematic viscosity is higher than the above upper limit, the grease is inferior in pumpability and handling, and it becomes difficult to apply and fill the wire, which is not preferable.
[0010]
As the grease base oil used in the anticorrosion wire of the present invention, other types of oils such as mineral oils (naphthene-based, paraffin-based) and synthetic oils may be used in an amount of 50% by weight as long as the above-mentioned polybutene is the main component. Less than a mixture can be used. More preferably, the polybutene content is 80% by weight or more, and further preferably, the polybutene content is 95% by weight or more.
[0011]
As the thickener, a type of grease having a drop point of 220 ° C. or more is used from the viewpoint of the heat resistance and dripping resistance of the grease. Examples of such thickeners include metal complex soaps, inorganic thickeners such as organic bentonite and silica gel, urea compounds such as polyurea, and polymer thickeners such as polytetrafluoroethylene. Alternatively, a mixture of two or more kinds may be used.
[0012]
Organized bentonite is obtained by adsorbing salts or the like of quaternary ammonium cations on the surface of bentonite clay mainly composed of clay minerals such as montmorillonite and making the surface hydrophobic. In other words, it is an intercalation compound formed by the quaternary ammonium cations penetrating between the layered silicate structures of the clay mineral, showing excellent dispersibility in organic solvents, and swelling by mixing with the base oil. , Thickening, thixotropic properties.
When an anionic polymer or a silane-based treating agent is used as a surface treating agent for bentonite, the hydrophobization of bentonite is not sufficiently performed and the hydrophilicity is increased, so that it is not suitable as a thickener. However, it is preferable to use a silane-based treating agent after the quaternary ammonium cation or the like is adsorbed and hydrophobized.
[0013]
The metal complex soap is obtained by compounding a metal salt of a long-chain fatty acid with a metal salt of another acid such as acetic acid, lactic acid, adipic acid, and dialkyl phosphoric acid. Examples of the metal include lithium, aluminum, calcium, and barium.
As long-chain fatty acids used in these complex soaps, those having a hydroxyl group in the molecule, such as 12-hydroxystearic acid, are particularly preferable because the thixotropic properties of the grease can be increased by rolling.
[0014]
Each of the above thickeners is excellent in heat resistance and water resistance and has high viscosity, so that grease having high thixotropic (thixotropic) can be obtained. For this reason, while being excellent in the applicability to an electric wire, dripping after erection and thermal deterioration due to heat generation during energization can be effectively suppressed, and the grease for an anticorrosion electric wire exhibits excellent properties.
In particular, the organized bentonite is particularly preferable because it has an ion-exchanging action, can adsorb metal ions and the like, does not react with corrosive substances such as acids, and hardly causes deterioration or softening.
[0015]
The mixing ratio of the base oil and the thickener is based on 100 parts by weight of the base oil, 5 to 50 parts by weight of the thickener is mixed, and the consistency of the obtained grease is adjusted to 180 to 340. Is preferred. When the consistency is less than 180, the obtained grease becomes very hard, and the applicability decreases. On the other hand, when it exceeds 340, the obtained grease softens and easily flows, which is not preferable.
[0016]
An antioxidant is added to the grease for an anticorrosion wire of the present invention in a range of 0.01 to 10 parts by mass with respect to 100 parts by mass of the base oil in order to suppress deterioration of the grease due to high-temperature thermal oxidation. As the antioxidant, phenol-based, amine-based, and phosphorus-based ones can be used, and phenol-based and amine-based ones are particularly preferable.
Further, other additives such as a metal deactivator, an acid acceptor such as calcium carbonate, and a weathering agent such as carbon may be added in an appropriate amount as long as the effects of the present invention are not impaired. . In addition, when the viscosity of the base oil is relatively low (for example, the kinematic viscosity at 40 ° C. is about 40 mm 2 / s), a thickener is added to the base oil to improve the adhesion to electric wires. 5 to 60 parts by mass can be added to 100 parts by mass. As the thickener, those having excellent flexibility at low temperatures are preferably used, and examples thereof include petroleum resins such as polyisobutylene, olefin copolymer (OCP), polymethacrylate, and petroleum rosin.
[0017]
The grease can be produced by an appropriate method such as a saponification method or a mixing method selected according to the raw materials.
For example, in greases using metal complex soap as a thickener, fats and oils and metal bases are heated and saponified in a base oil under normal pressure or pressure, and after cooling, various additives are added. Grease can be produced by mixing, homogenizing by milling, filtering and defoaming.
In greases using organic bentonite as a thickening agent, a base oil and organic bentonite are placed in a mixing tank, and a swelling agent such as methanol is added to swell the organic bentonite, followed by mixing, and various additives. Is added, heated if necessary, mixed, homogenized by milling, filtered and defoamed to produce grease.
[0018]
Grease can be filled into an electric wire (twisted wire) by twisting a plurality of strands while packing the grease between the strands when manufacturing the electric wire. The grease is applied to the outer peripheral surface of the electric wire by an appropriate applying unit. The thickness of the grease applied may be such that the electric wires are not exposed.
From the viewpoint of corrosion protection, it is preferable to fill grease between the strands of the electric wire and apply the grease to the outer periphery of the electric wire. However, if the environmental conditions are not so severe, only the filling may be performed. When the electric wire is a single wire or a dense stranded wire, only application is performed.
The anticorrosion wire manufactured in this way can be applied to overhead power lines such as overhead power transmission lines and overhead ground wires, as well as jumpers and buses in substations.
[0019]
Hereinafter, specific examples will be described. A grease for a corrosion-resistant electric wire having the composition shown in Table 1 was prepared.
The properties of the base oil used are as follows.
Polybutene A: the kinematic viscosity is 645 mm 2 / s at 40 ° C and 28 mm 2 / s at 100 ° C.
Polybutene B: kinematic viscosity, 220 mm 2 / s at 9600mm 2 / s, 100 ℃ at 40 ° C..
Polybutene C: kinematic viscosity, 850 mm 2 / s at 37000mm 2 / s, 100 ℃ at 40 ° C..
Polybutene D: kinematic viscosity, 14 mm 2 / s at 205mm 2 / s, 100 ℃ at 40 ° C..
Polybutene E: kinematic viscosity, 3100mm 2 / s at 170000mm 2 / s, 100 ℃ at 40 ° C..
Mineral oil: kinematic viscosity, 10 mm in 100mm 2 / s, 100 ℃ at 40 ℃ 2 / s.
[0020]
The additives used are as follows.
As the antioxidant, phenol-based pentaerythritol-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] was used.
As the thickener, polyisobutylene (viscosity average molecular weight: 40000, pour point: 77.5) was used.
[0021]
Next, the obtained greases for anticorrosion wires were subjected to the following evaluation tests to evaluate the characteristics.
[Consistency]
The consistency of grease was measured by the method described in 5.3 of JIS K2200. In the grease for an anticorrosion wire, a desirable range of the consistency is 180 to 340.
(Drip point)
The drop point of the grease was measured by the method described in 5.4 of JIS K 2200, and was evaluated as “の” at 220 ° C. and as “X” at less than 220 ° C.
(Applicability)
When the grease is applied and filled into the aluminum power transmission line (ACSR), if the grease has good injectability and does not peel off from the wire, it is marked with "○". The grease has weak adhesion and peels off. Was evaluated as "x".
[0022]
[Sagging at high temperatures]
Grease was filled between the strands of an aluminum power transmission line (200 mm 2 stranded wire) and applied to the surface of the stranded wire to produce an anticorrosion wire. This was left at 150 ° C. for 200 hours, and “、” indicates that the grease did not sag, “○” indicates that the sagging amount relative to the applied amount was less than 3%, and 3% or more relative to the applied amount. Were evaluated as "x".
[0023]
(Cold resistance)
Grease is applied to one side of a metal plate (SUS plate) having a width of 50 mm and a thickness of 0.5 mm with a thickness of 0.5 mm to prepare a sample, which is left in a -30 ° C. constant temperature bath for 1 hour. did. Immediately after the sample was taken out of the thermostat, the grease-applied surface was directed outward and was brought into contact with a mandrel having a radius of 80 mm, and the sample was curved along the outer peripheral surface of the mandrel. At this time, the grease-applied surface was visually observed, `` ◎ '' when no crack was observed, `` ○ '' when a slight crack was observed, and `` X '' when a considerable crack or peeling occurred. Was evaluated.
[0024]
(Anti-corrosion performance)
Grease was applied at a thickness of 0.08 mm to the surface of an aluminum plate having a thickness of 1 mm to prepare a sample, which was left in a desiccator containing hydrochloric acid having a concentration of 6 mol / l for 30 days. After removing the sample from the desiccator and removing the grease, the surface roughness of the aluminum plate was measured. At this time, the case where the average surface roughness was 2 μm or less was evaluated as “○”, and the case where the average surface roughness exceeded 2 μm was evaluated as “X”.
[0025]
Tables 1 and 2 show the results of these evaluation tests.
[0026]
[Table 1]
Figure 2004095338
[0027]
[Table 2]
Figure 2004095338
[0028]
As is clear from the above results, all of the anticorrosion wires of the examples had an appropriate consistency, and passed the tests for applicability, dripping, cold resistance, and anticorrosion performance.
The anticorrosion wires of Examples 1 to 6, in which the blending ratio of polybutene in the base oil was 100%, were extremely excellent in both dripping properties at high temperatures and cold resistance.
The anticorrosion wire of Example 7 in which the blending ratio of polybutene in the base oil was 95% showed slight cracks in the cold resistance test, but had no practical problem and had extremely excellent dripping at high temperatures. .
The anticorrosion wire of Example 8 in which the blending ratio of polybutene in the base oil was 80% showed little dripping at a high temperature and slight cracks in a cold resistance test, but was practically satisfactory and excellent. Exhibited anticorrosion performance.
[0029]
On the other hand, the anticorrosion wire of Comparative Example 1 in which the viscosity of polybutene at 100 ° C. was low and the compounding ratio of the thickener was too small had a high consistency and was inferior in dripping at high temperatures.
In the anticorrosion wire of Comparative Example 2 in which the viscosity of polybutene was high, the applicability was poor.
The anticorrosion wires of Comparative Example 3 using mineral oil as the base oil and Comparative Example 4 having a low blending ratio of polybutene had a reduced flow under cold conditions due to the wax content in the mineral oil, and failed in the cold resistance test. became.
The anticorrosion wire of Comparative Example 5 to which the antioxidant was not added had a consistency within an appropriate range, but was considerably dripped at a high temperature due to deterioration at a high temperature.
The anticorrosion wire of Comparative Example 6 using Al soap as a thickener had a low dropping point and increased fluidity due to a rise in temperature, and thus failed in dripping at high temperatures.
In the anticorrosion wire of Comparative Example 7 in which the compounding ratio of the thickener was excessive, the consistency was small and application was difficult.
The anticorrosion wire of Comparative Example 8 in which the compounding ratio of the antioxidant was excessive and the anticorrosion wire of Comparative Example 9 in which calcium carbonate was added as a thickener had poor anticorrosion performance and were rejected.
[0030]
【The invention's effect】
As described above, the anticorrosion wire of the present invention has a base oil containing, as a main component, polybutene having a kinematic viscosity at 40 ° C of 30 to 50000 mm 2 / s and a kinematic viscosity at 100 ° C of 20 to 1000 mm 2 / s. 5 to 50 parts by mass of a thickener having a grease drop point of 220 ° C. or more, and 100 parts by mass of a grease coated with and / or filled with 0.01 to 10 parts by mass of an antioxidant. As a result, sagging at high temperatures and cracking under cold conditions are prevented from deteriorating in corrosion resistance, resulting in extremely high corrosion protection.

Claims (1)

主成分として、40℃における動粘度が30〜50000mm/s、100℃における動粘度が20〜1000mm/sであるポリブテンを含有する基油100質量部に対して、
グリースの滴点が220℃以上となる増ちょう剤を5〜50質量部、酸化防止剤を0.01〜10質量部配合したグリースを塗布および/または充填したことを特徴とする防食電線。
As a main component, 100 parts by mass of a base oil containing polybutene having a kinematic viscosity at 40 ° C of 30 to 50,000 mm 2 / s and a kinematic viscosity at 100 ° C of 20 to 1000 mm 2 / s,
An anticorrosion electric wire, characterized by applying and / or filling grease containing 5 to 50 parts by mass of a thickening agent and 0.01 to 10 parts by mass of an antioxidant, wherein the grease has a drop point of 220 ° C. or more.
JP2002254861A 2002-08-30 2002-08-30 Anticorrosion wire Expired - Lifetime JP3974000B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007220682A (en) * 2007-02-16 2007-08-30 Viscas Corp Low corona electric wire
JP2007250538A (en) * 2006-02-16 2007-09-27 Viscas Corp Anticorrosion low corona wire
JP2008115237A (en) * 2006-11-02 2008-05-22 Chugoku Electric Power Co Inc:The Corrosion resistant grease composition and corrosion resistant overhead wire
JP2015124404A (en) * 2013-12-26 2015-07-06 株式会社オートネットワーク技術研究所 Composition for corrosion prevention and electric cable with terminal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007250538A (en) * 2006-02-16 2007-09-27 Viscas Corp Anticorrosion low corona wire
JP2008115237A (en) * 2006-11-02 2008-05-22 Chugoku Electric Power Co Inc:The Corrosion resistant grease composition and corrosion resistant overhead wire
JP2007220682A (en) * 2007-02-16 2007-08-30 Viscas Corp Low corona electric wire
JP2015124404A (en) * 2013-12-26 2015-07-06 株式会社オートネットワーク技術研究所 Composition for corrosion prevention and electric cable with terminal

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