JP3685370B2 - Watertight material composition for electric wires - Google Patents
Watertight material composition for electric wires Download PDFInfo
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- JP3685370B2 JP3685370B2 JP19628099A JP19628099A JP3685370B2 JP 3685370 B2 JP3685370 B2 JP 3685370B2 JP 19628099 A JP19628099 A JP 19628099A JP 19628099 A JP19628099 A JP 19628099A JP 3685370 B2 JP3685370 B2 JP 3685370B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Description
【0001】
【発明の属する技術分野】
本発明は電線に耐水性を付与するための電線用水密材料組成物に関する。
【0002】
【従来の技術】
従来より、水中での作業に使用される機器類への給電、あるいは前記機器類の制御を目的として常に水中に没した状態で使用される電線が知られている。このような電線では、外被からケーブル内部への水の侵入を阻止することが要求されるが、それに伴って外被にピンホールやクラック等があっても、それらを通じて侵入する水を局所的に止めて導体まで到達させないことも要求される。
また、架空送電線や屋外配線に使用される電線においても、同様に雨や雪による水の侵入を阻止する必要がある。
【0003】
そのため、従来では、図1に示すように、導体1の周囲に水密材料2を隙間無く充填し、その外側を外被3で被覆した構成の電線が一般的に使用されている。水密材料2も種々のものが知られており、例えば特開昭60−154408号公報には、エチレン・酢酸ビニル共重合体にシランカップリング剤であるオルガノシランを添加した水密材料が記載されている。また、特開平3−81911号公報には、エチレン・酢酸ビニル−ポリ塩化ビニル共重合体を主体とし、これにエチレン・酢酸ビニル共重合体やエチレン・アクリル酸エステル共重合体をベースとするホットメルト樹脂を配合した水密材料が記載されている。更に、水密材料2として、ゼリー状組成物や水との接触により膨潤するボバールやカーボボール等も使用されている。
【0004】
しかしながら、特開昭60−154408号公報や特開平3−81911号公報に記載された水密材料2では、充填直後の屈曲を余り受けていない状態では樹脂成分の接着力により水密性が得られても、繰り返して屈曲を受けると機械的変形により水密性が低下するという問題がある。また、外被を形成する材料、例えば可塑剤が、経時的に水密材料に移行して外被と水密材料との密着力が強くなり、外被の皮剥ぎ作業が困難になる。
一方、ゼリー状組成物やボバール、カーボボール等では、充填作業や塗工作業が必要であり、製造工程が複雑になる。
【0005】
また、上記に挙げた水密材料の他にもエチレン系樹脂に過酸化物系の架橋剤を配合したものも使用されているが、架橋に際して大がかりな装置を要するという問題を抱えている。
【0006】
【発明が解決しようとする課題】
本発明は上記の状況に鑑みてなされたものであり、水密性を長期にわたり良好に維持でき、しかも外被の剥離が容易で、かつ水密構造を有する電線を製造するのに大がかりな装置や複雑な作業を必要としない電線用水密材料組成物を提供することを目的とする。
【0007】
【課題を解決するための手段】
上記の目的は、本発明の、エチレン系樹脂100重量部に対してホットメルト樹脂10〜50重量部、更にエチレン・アクリル酸・無水マレイン酸共重合体を含む樹脂成分に、シラン架橋剤を配合してなることを特徴とする電線用水密材料組成物により達成される。
【0008】
【発明の実施の形態】
以下、本発明に関して詳細に説明する。
本発明の水密材料組成物の樹脂成分は、エチレン系樹脂とホットメルト樹脂とを必須成分とする。
エチレン系樹脂は特に制限されるものでは無く、従来より水密材料に使用されているものを使用することができる。具体的には、ポリエチレンの他、エチレン・酢酸ビニル共重合体、エチレン・アクリル酸エチル共重合体、エチレン・γ−オレフィン共重合体、エチレン・ビニルアルコール共重合体、エチレン・プロピレン・ジエン三元共重合体等のエチレンと他のモノマーとの共重合体が使用可能である。
また、これらのエチレン系樹脂は混合して使用することもできる。
【0009】
一方、ホットメルト樹脂も特に制限されるものではないが、ポリエチレンやポリイソブチレン、エチレン・酢酸ビニル共重合体、エチレン・アクリル酸エステル共重合体、ポリアミド等の各種の熱可塑性ポリマーが使用可能である。
また、これらのホットメルト樹脂は混合して使用することもできる。
【0010】
上記のエチレン系樹脂とホットメルト樹脂との配合割合は、エチレン系樹脂100重量部に対してホットメルト樹脂が10〜50重量部であることが好ましく、特にホットメルト樹脂が10〜20重量部であることが好ましい。このホットメルト樹脂は樹脂成分の接着力を高めるために配合される成分であり、従ってその配合量が10重量部未満では、導体間及び導体と外被との密着力が低くすぎて水密性が不十分となる。一方、ホットメルト樹脂の配合量が50重量部を超える場合には、導体間及び導体と外被との密着力が強くなりすぎて外被の剥離が困難となる。
【0011】
また、上記の樹脂成分は更にエチレン・アクリル酸・無水マレイン酸共重合体を含む。このエチレン・アクリル酸・無水マレイン酸共重合体はホットメルト樹脂の接着効果を発現させるための核として作用し、これをエチレン系樹脂100重量部に対して10重量部程度配合することにより水密性を更に向上させることができる。
【0012】
本発明の水密材料組成物では、上記の樹脂成分にシラン架橋剤が添加される。
シラン架橋剤としては、ビニルトリメトキシシランやビニルトリエトキシシラン、ビニルメチルジエトキシシラン、ビニルフェニルジメトキシシラン等のビニルアルコキシシラン、ビニルトリアセトキシシラン等のビニルカルボキシシラン等を使用できる。また、これらのシラン架橋剤は混合して使用することもできる。
シラン架橋剤の配合量は、上記の樹脂成分100重量部に対して1.0重量部が適当である。
【0013】
また、架橋助剤及び架橋安定化剤の併用が好ましい。
架橋助剤としては有機過酸化物が好ましく、例えばジクミルパーオキサイドや過酸化ベンゾイル等を使用することができる。この有機過酸化物の配合量は、上記の樹脂成分100重量部に対して0.05重量部が適当である。
架橋安定化剤としては、例えばジブチル錫ジラウレートやジブチル錫ジマレート、ジブチル錫ジアセテート、ジブチル錫メチルカプチド、酢酸第一錫等の錫系化合物の他、ナフテン酸亜鉛、無機酸や脂肪酸等の酸類、エチルアミンやジブチルアミン、ヘキシルアミン等の有機塩基類等を適宜選択して使用することができる。これらの配合量は、上記樹脂成分100重量部に対して0.05重量部が適当である。
【0014】
更に、本発明の水密材料組成物には、必要に応じて、従来より水密材料組成物に添加される各種添加剤を添加してもよい。例えば、カーボンブラックや老化防止剤、紫外線吸収剤、着色剤等を適量添加することができる。
そして、上記の樹脂成分、ホットメルト樹脂、シラン架橋剤及び各種添加剤をヘンシェルミキサー等の公知の混練機を用いて混練して本発明の水密材料組成物が得られる。尚、混練に際して加熱を行ってもよい。
【0015】
本発明の水密材料組成物を用いて水密構造を有する電線を製造するには、過酸化物系架橋剤用のような特別な架橋装置を用いること無く、公知の押出成形装置を用いて導体上に水密材料組成物を供給すればよく、その際、水密材料組成物に含まれるホットメルト樹脂の作用により、導体間の隙間や導体と外被との間への充填が良好に行われて導体間や導体と外被との密着性が均一になり、長期にわたり水密性を良好に維持する。また、外被との間で従来の高圧化での架橋を有さない為、密着過多が無く、材料の特徴を用いて密着させるため、外被の皮剥ぎ作業も容易になる。
【0016】
【実施例】
以下、実施例を挙げて本発明を更に説明する。
表1に示す如く、エチレン系樹脂、ホットメルト樹脂、シラン架橋剤及びその他の成分を配合し、ヘンシェルミキサーを用いて混練して各種の水密材料組成物を調製した。
そして、各水密材料組成物を用いて直径20mmの電線を作製し、その水密性及び外被の皮剥ぎ性を評価した。結果を表1に併記する。
水密性については、作製直後の未屈曲の電線について電線1m当り0.5kg/cm2 の水圧で24時間水没させた後に水漏れの有無を目視にて確認した。また、5回屈曲させた後の電線についても同様の水没試験を行い、水漏れの有無を確認した。何れも、水漏れが無い場合を「〇」、水漏れが有る場合を「×」として表中に記した。また、皮剥ぎ性については、電線の外被10cmを皮剥ぎした時の外被の剥けの有無及び残留状態から評価し、外被の剥け及び残留が無い場合を「〇」、外被の剥け又は残留が有る場合を「×」として表中に記した。
【0017】
【表1】
【0018】
注)エチレン・エチルアクリレート:日本ユニカー(株)製「NUC6070」
ホットメルト樹脂:宇部興産(株)製「ウベタックUT2315」
アチレン・アクリル酸・無水マレイン酸共重合体:試験用配合品
カーボンブラック:ライオン(株)製「ケッチェンブラックEC」
架橋剤:ジクミルパーオキサイド
老化防止剤:チバガイギー(株)製「イルガノックス1010」
ビニルトリメトキシシラン:東レ・ダウコーニング・シリコーン(株)製「SZ6300」
【0019】
また、電線を作製する時の生産性の評価も併記したが、比較例3では架橋をジクミルパーオキサイド(過酸化物系架橋剤)で行うために、装置及び工程的に不利であり「×」を記してある。
以上より、本発明の水密材料組成物を用いることにより、水密性及び外被の皮剥ぎ性に優れた水密構造を有する電線が特別な装置を用いること無く、安価に得られることがわかる。
【0020】
【発明の効果】
以上説明したように、本発明によれば、水密性を長期にわたり良好に維持でき、しかも外被の皮剥ぎが容易で、かつ水密構造を形成するために大がかりな装置や複雑な作業を必要としない電線用水密材料組成物が提供される。
【図面の簡単な説明】
【図1】水密構造を有する電線の一例を示す要部断面図である。
【符号の説明】
1 導体
2 水密材料
3 外被[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a watertight material composition for electric wires for imparting water resistance to electric wires.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is known an electric wire that is used in a state where it is always submerged in water for the purpose of supplying power to equipment used for underwater work or controlling the equipment. In such an electric wire, it is required to prevent water from entering the cable from the jacket, but even if there are pinholes, cracks, etc. in the jacket, the water that penetrates through the jacket locally It is also required to stop the conductor from reaching the conductor.
Similarly, in the case of electric cables used for overhead power transmission lines and outdoor wiring, it is necessary to prevent water from entering due to rain or snow.
[0003]
For this reason, conventionally, as shown in FIG. 1, an electric wire having a structure in which a watertight material 2 is filled around a conductor 1 without a gap and the outside is covered with a jacket 3 is generally used. Various watertight materials 2 are also known. For example, Japanese Patent Application Laid-Open No. Sho 60-154408 describes a watertight material obtained by adding an organosilane as a silane coupling agent to an ethylene / vinyl acetate copolymer. Yes. Japanese Patent Application Laid-Open No. 3-81911 discloses a hot resin mainly composed of an ethylene / vinyl acetate / polyvinyl chloride copolymer, which is based on an ethylene / vinyl acetate copolymer or an ethylene / acrylic acid ester copolymer. A watertight material blended with a melt resin is described. Furthermore, as the watertight material 2, a jelly-like composition, bobar or carboball which swells by contact with water is also used.
[0004]
However, in the watertight material 2 described in JP-A-60-154408 and JP-A-3-81911, watertightness is obtained by the adhesive force of the resin component in a state where it is not subjected to bending immediately after filling. However, when it is repeatedly bent, there is a problem that watertightness is lowered due to mechanical deformation. In addition, the material forming the outer cover, for example, the plasticizer, moves to the water-tight material over time, and the adhesion between the outer cover and the water-tight material becomes stronger, making it difficult to peel the outer cover.
On the other hand, in the case of a jelly-like composition, bovar, carbo ball, etc., a filling operation and a coating operation are required, and the manufacturing process becomes complicated.
[0005]
In addition to the watertight materials listed above, an ethylene resin blended with a peroxide crosslinking agent is also used, but has a problem that a large-scale apparatus is required for crosslinking.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above situation, and can maintain a good water tightness over a long period of time, can be easily peeled off, and can be a large-scale device or a complicated device for producing an electric wire having a water tight structure. An object of the present invention is to provide a watertight material composition for electric wires that does not require any work.
[0007]
[Means for Solving the Problems]
The purpose of the present invention is to blend a silane crosslinking agent in the resin component containing 10 to 50 parts by weight of a hot melt resin and 100 parts by weight of an ethylene / acrylic acid / maleic anhydride copolymer with respect to 100 parts by weight of the ethylene resin of the present invention. This is achieved by a watertight material composition for electric wires.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
The resin component of the watertight material composition of the present invention comprises an ethylene-based resin and a hot melt resin as essential components.
The ethylene resin is not particularly limited, and those conventionally used for watertight materials can be used. Specifically, in addition to polyethylene, ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate copolymer, ethylene / γ-olefin copolymer, ethylene / vinyl alcohol copolymer, ethylene / propylene / diene ternary Copolymers of ethylene and other monomers such as copolymers can be used.
Further, these ethylene resins can be used in combination.
[0009]
On the other hand, the hot melt resin is not particularly limited, but various thermoplastic polymers such as polyethylene, polyisobutylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid ester copolymer, and polyamide can be used. .
Also, these hot melt resins can be used in combination.
[0010]
The blending ratio of the ethylene resin and the hot melt resin is preferably 10 to 50 parts by weight of the hot melt resin with respect to 100 parts by weight of the ethylene resin, and particularly 10 to 20 parts by weight of the hot melt resin. Preferably there is. This hot melt resin is a component blended to increase the adhesive strength of the resin component. Therefore, if the blending amount is less than 10 parts by weight, the adhesion between the conductors and between the conductor and the jacket is too low, and the water tightness is low. It becomes insufficient. On the other hand, when the blending amount of the hot melt resin exceeds 50 parts by weight, the adhesion between the conductors and between the conductor and the jacket becomes too strong, and the peeling of the jacket becomes difficult.
[0011]
The resin component further contains an ethylene / acrylic acid / maleic anhydride copolymer . This ethylene / acrylic acid / maleic anhydride copolymer acts as a nucleus for developing the adhesive effect of the hot melt resin, and it is watertight by blending about 10 parts by weight with 100 parts by weight of the ethylene resin. Can be further improved.
[0012]
In the watertight material composition of the present invention, a silane crosslinking agent is added to the resin component.
As the silane crosslinking agent, vinyl alkoxysilane such as vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldiethoxysilane, and vinylphenyldimethoxysilane, vinylcarboxysilane such as vinyltriacetoxysilane, and the like can be used. Moreover, these silane crosslinking agents can also be used in mixture.
An appropriate amount of the silane crosslinking agent is 1.0 part by weight per 100 parts by weight of the resin component.
[0013]
Moreover, the combined use of a crosslinking aid and a crosslinking stabilizer is preferred.
As the crosslinking aid, an organic peroxide is preferable. For example, dicumyl peroxide, benzoyl peroxide, or the like can be used. The amount of the organic peroxide is suitably 0.05 parts by weight with respect to 100 parts by weight of the resin component.
Examples of the crosslinking stabilizer include tin compounds such as dibutyltin dilaurate, dibutyltin dimaleate, dibutyltin diacetate, dibutyltin methylcaptide, stannous acetate, zinc naphthenate, acids such as inorganic acids and fatty acids, ethylamine, and the like. And organic bases such as dibutylamine and hexylamine can be appropriately selected and used. These blending amounts are suitably 0.05 parts by weight with respect to 100 parts by weight of the resin component.
[0014]
Furthermore, you may add the various additives conventionally added to the watertight material composition to the watertight material composition of this invention as needed. For example, carbon black, an antioxidant, an ultraviolet absorber, a colorant, and the like can be added in appropriate amounts.
Then, the water-tight material composition of the present invention is obtained by kneading the above resin component, hot melt resin, silane crosslinking agent and various additives using a known kneader such as a Henschel mixer. In addition, you may heat at the time of kneading | mixing.
[0015]
In order to produce an electric wire having a watertight structure using the watertight material composition of the present invention, a known extrusion molding apparatus is used without using a special crosslinking apparatus such as a peroxide-based crosslinking agent. The water-tight material composition may be supplied to the conductor, and in this case, the hot melt resin contained in the water-tight material composition may be used to satisfactorily fill the gap between the conductors and between the conductor and the jacket. Maintains good water tightness over a long period of time, with uniform adhesion between the conductor and the jacket. In addition, since there is no conventional high-pressure cross-linking with the outer jacket, there is no excessive adhesion, and the outer skin is easily peeled off by using the characteristics of the material.
[0016]
【Example】
Hereinafter, the present invention will be further described with reference to examples.
As shown in Table 1, ethylene resin, hot melt resin, silane crosslinking agent and other components were blended and kneaded using a Henschel mixer to prepare various watertight material compositions.
And the electric wire of diameter 20mm was produced using each watertight material composition, and the watertightness and the skin peelability were evaluated. The results are also shown in Table 1.
Regarding watertightness, an unbent electric wire immediately after production was submerged at a water pressure of 0.5 kg / cm 2 per 1 m of electric wire for 24 hours, and then the presence or absence of water leakage was visually confirmed. Moreover, the same submergence test was done also about the electric wire after bending 5 times, and the presence or absence of the water leak was confirmed. In both cases, the case where there was no water leakage was indicated in the table as “◯” and the case where there was water leakage was indicated as “X”. In addition, the peelability is evaluated based on the presence or absence of the sheath when the 10 cm outer sheath of the electric wire is peeled off and the residual state. Or the case where there was a residue was described in the table as "x".
[0017]
[Table 1]
[0018]
Note) Ethylene / ethyl acrylate: “NUC6070” manufactured by Nippon Unicar Co., Ltd.
Hot melt resin: “Ubetak UT2315” manufactured by Ube Industries, Ltd.
Atylene / acrylic acid / maleic anhydride copolymer: test compound carbon black: “Ketjen Black EC” manufactured by Lion Corporation
Cross-linking agent: Dicumyl peroxide anti-aging agent: “Irganox 1010” manufactured by Ciba Geigy Co., Ltd.
Vinyltrimethoxysilane: “SZ6300” manufactured by Toray Dow Corning Silicone Co., Ltd.
[0019]
Moreover, although evaluation of productivity at the time of producing an electric wire was also described, in Comparative Example 3, since crosslinking is performed with dicumyl peroxide (peroxide-based crosslinking agent), it is disadvantageous in terms of equipment and process. Is marked.
From the above, it can be seen that by using the watertight material composition of the present invention, an electric wire having a watertight structure excellent in water tightness and skin peelability can be obtained at low cost without using a special device.
[0020]
【The invention's effect】
As described above, according to the present invention, water tightness can be maintained well over a long period of time, and the skin can be easily peeled off, and a large-scale apparatus and complicated work are required to form a water tight structure. A watertight material composition for electric wires is provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing an example of an electric wire having a watertight structure.
[Explanation of symbols]
1 Conductor 2 Watertight material 3 Jacket
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP19628099A JP3685370B2 (en) | 1999-07-09 | 1999-07-09 | Watertight material composition for electric wires |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP19628099A JP3685370B2 (en) | 1999-07-09 | 1999-07-09 | Watertight material composition for electric wires |
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JP2001023450A JP2001023450A (en) | 2001-01-26 |
JP3685370B2 true JP3685370B2 (en) | 2005-08-17 |
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JP19628099A Expired - Fee Related JP3685370B2 (en) | 1999-07-09 | 1999-07-09 | Watertight material composition for electric wires |
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JP4445727B2 (en) * | 2003-07-29 | 2010-04-07 | 株式会社フジクラ | Watertight resin composition and watertight insulated wire |
AU2004279015B2 (en) * | 2003-09-16 | 2007-10-11 | Commscope, Inc. Of North Carolina | Coaxial cable with strippable center conductor precoat |
JP5841325B2 (en) * | 2010-11-19 | 2016-01-13 | 宏 二宮 | Bare chip mounting surface light emitter |
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