JP3956033B2 - Solvent resistant cable for moving parts - Google Patents
Solvent resistant cable for moving parts Download PDFInfo
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- JP3956033B2 JP3956033B2 JP24519597A JP24519597A JP3956033B2 JP 3956033 B2 JP3956033 B2 JP 3956033B2 JP 24519597 A JP24519597 A JP 24519597A JP 24519597 A JP24519597 A JP 24519597A JP 3956033 B2 JP3956033 B2 JP 3956033B2
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- resistant cable
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Description
【0001】
【発明の属する技術分野】
本発明は可動部用耐溶剤性ケーブルに関し、詳しくは柔軟性、耐溶剤性、及び耐摩耗性に優れた可動部用耐溶剤性ケーブル(ポリオレフィン被覆ケーブル)に関する。なお、ここでいう「可動部」とは、主として、塗装ロボットアーム部や塗装機のケーブル・ホース支持案内装置などをいう。
【0002】
【従来の技術と発明が解決しようとする課題】
従来、可動部用ケーブルの被覆材としては、ポリ塩化ビニル樹脂組成物やポリウレタン系エラストマーよりなる樹脂成形体が一般的に使用されていた。
【0003】
しかし、前者は、トルエンなどの各種溶剤に晒されると著しく硬化したり、収縮するといった問題があった。また、後者は、溶剤に晒されると著しく膨潤するなど、耐溶剤性に劣っていた。
【0004】
そこで、優れた耐溶剤性を有するといわれる樹脂、例えばポリエチレン樹脂、フッ素樹脂(含有フッ素系エラストマー)、ポリアミド樹脂(含ポリアミド系エラストマー)等を可動部用のケーブルに利用することが一応考えられる。しかしながら、これら樹脂は柔軟性に乏しいことから、可動部用のケーブルには適さない。
【0005】
また、耐溶剤性の要求に応じ、次のような提案がなされた(特開昭59−160909号公報参照)。すなわち、密度、メルトインデックス値を限定したエチレンと炭素数が4以上のα−オレフィンとの線状エチレン共重合体を主体とした材料をケーブルの保護層として用いるという提案がなされた。
【0006】
しかしながら、上記線状エチレン共重合体は耐ESCR、耐溶剤性に優れているものの、やはり柔軟性に乏しく、可動部用のケーブルには適さなかった。
【0007】
[発明の目的]
本発明の目的は、柔軟性に優れていることはもちろんのこと、耐溶剤性及び耐摩耗性にも優れた可動部用耐溶剤性ケーブルを提供するところにある。
【0008】
【課題を解決するための手段】
本発明者らは、上記の目的を達成するために鋭意検討を重ねた結果、ポリエチレンと、特定の部分架橋ポリオレフィン系エラストマーとを混合して得たポリオレフィン組成物の成形体が、柔軟性、耐溶剤性、及び耐摩耗性に優れたシースとなることを見い出し、そして本発明に至った。
【0009】
本発明の可動部用耐溶剤性ケーブルは、複数本の絶縁線心と該線心の外周にシースが施されてなるケーブルであって、前記シースが、(A)ポリエチレン30〜70重量部、(B)ポリプロピレン5〜50重量%と、ゲル分(ゲル分率)が5〜60%でHDA硬度が70〜90であるエチレン−α−オレフィン共重合体95〜50重量%よりなるポリオレフィン系エラストマー70〜30重量部からなる樹脂組成物の成形体であって、HDD硬度が30〜40である被覆材よりなることを特徴とする。
【0010】
【発明の実施の形態】
(A)ポリエチレン
本発明に使用するポリエチレン(A)としては、低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、超低密度ポリエチレン、直鎖状ポリエチレン等が挙げられる。平均分子量に特に限定はないが、およそのところ1×103〜5×104である。1×103未満では、耐溶剤性に劣るという可能性が生じ易くなり、5×104を超える場合、成形加工性が悪くなるという可能性が生じやすくなる。
【0011】
配合量としては、上述したように30〜70重量部である。30重量部未満の場合、耐溶剤性及び耐摩耗性が充分でなく、逆に70重量部を超える場合、柔軟性が悪くなる。なお、好ましい範囲は、40〜60重量部である。
【0012】
(B)ポリオレフィン系エラストマー
本発明に使用するポリオレフィン系エラストマー(B)は、ポリプロピレン5〜50重量%と、ゲル分が5〜60%でHDA硬度が70〜90であるエチレン−α−オレフィン共重合体95〜50重量%よりなる。エチレン−α−オレフィン共重合体のゲル分が5%未満の場合、耐溶剤性が悪く、逆にゲル分が60%を超えると、耐溶剤性は向上するものの、成形加工性が悪くなる。また、HDA硬度が70未満の場合、耐溶剤性が悪く、90を超えると柔軟性が悪くなる。
【0013】
ポリオレフィン系エラストマー(B)の配合量は前記のごとく、ポリエチレン30〜70重量部に対して70〜30重量部である。70重量部を超える場合、耐溶剤性及び耐摩耗性が充分でなく、逆に30重量部未満の場合、柔軟性が悪くなる。なお、好ましい範囲は、60〜40重量%である。
【0014】
〈その他〉
ポリエチレン(A)とポリオレフィン系エラストマー(B)よりなる可動部用耐溶剤性ケーブル用樹脂組成物に、公知の酸化防止剤、銅害防止剤、難燃剤、滑剤、着色剤などを適宜併用することができる。
【0015】
【発明の効果】
本発明の可動部用耐溶剤性ケーブルは適度の柔軟性を有し、耐摩耗性に優れている。しかも、耐溶剤性に優れていることから、塗装ロボットアーム部や塗装機のケーブル・ホース支持案内装置などに用いられて各種溶剤が付着したり、溶剤が浸漬しても従来のように膨潤したり、硬化したり収縮するようなことはない。
【0016】
【実施例】
下記[表2]〜[表6]にそれぞれ記載した各樹脂、及びエラストマーを同表に記載した割合で以て配合し、オープンロールやニーダー等の混練機を使用して均一に混合し、樹脂組成物を得た。なお、各エラストマー(A〜F,K〜R)に関するポリプロピレン含有量、エチレン−α−オレフィン含有量、ゲル分率、及びHDA硬度の詳細は[表1]の如くである。
【0017】
得られた組成物を180℃、50kgf/cm2で5分間加圧プレスし、厚さ1mm及び10mmのシートを成形した。
【0018】
この成形シートを用いて、HDD硬度およびトルエン浸漬後の重量変化率の測定を行なった。
【0019】
また、得られた組成物を65mm押出成形機にて、シース材として被覆成形して図1に示すケーブル(PCCE−SB 2C×0.5mm2、計装用架橋ポリエチレン絶縁ポリオレフィンシースケーブル<編組しゃへい付>、仕上げ外径:約5.5mm)を作成した。このケーブルを用いて摩耗試験を行なった。それぞれの結果を[表2]〜[表6]に併記する。
【0020】
なお、(1)HDD硬度の測定、(2)トルエン浸漬後の重量変化率の測定、及び(3)耐摩耗性試験の各操作方法及び評価方法は次の通りである。
【0021】
(1)HDD硬度の測定
前記試料30×30×10(mm)のプレスシートを用い、JIS K 7215「プラスチックのデュロメータ硬さ試験方法」に従って測定した。
【0022】
(2)トルエン浸漬後の重量変化率の測定
前記試料30×30×1(mm)のプレスシートを用い、50℃のトルエン中に3時間浸漬し、取り出し直後表面のトルエンを軽く拭き取り重量を測定した。そのあと、80℃×10時間減圧乾燥し、乾燥後の重量を測定して次式によって重量変化率を求めた。
【0023】
重量変化率(%)=
[{(浸漬後の重量)−(減圧乾燥後の重量)}/(減圧乾燥後の重量)]×100
【0024】
(3)耐摩耗試験
UL−1581(エレベータケーブルの摩耗試験)に定められた摩耗試験装置を用いて実施した。図2に示す刃先を移動テーブル上に取り付けたケーブルに圧着し、移動テーブルを往復させてシース材が摩耗して編組しゃへいに到達するときの移動回数を求め(移動ストローク:150mm、移動速度:30回/分(1往復を1回と数える)、刃先をケーブルに圧着する荷重:760gf)、移動回数が5,001回以上のものを○、2,001〜5,000回のものを△、2,000回以下のものを×と評価した。このように移動回数が多いほど、耐摩耗性に優れていると言える。
【0025】
【表1】
【0026】
【表2】
【0027】
【表3】
【0028】
【表4】
【0029】
【表5】
【0030】
【表6】
【0031】
[表2]〜[表6]の結果から明らかなように、本発明の可動部用耐溶剤性ケーブルは、耐摩耗性及び耐溶剤性に優れ、しかも柔軟性も良好であることが分かる。すなわち、このような特性は、ポリエチレンと特定のポリオレフィン系エラストマーとを特定割合で組み合わせた各実施例のシース材により初めて得られ、比較例に示すような組み合わせのシース材では、塗装ロボットの可動部等のような非常に過酷な所にも使用できるようなケーブルは到底得られないのである。
【図面の簡単な説明】
【図1】 作成したケーブルの断面図を示す。
【図2】 耐摩耗試験で用いて刃先の形状を示す正面図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solvent resistant cable for a movable part, and more particularly to a solvent resistant cable for a movable part (polyolefin-coated cable) excellent in flexibility, solvent resistance, and abrasion resistance. Here, the “movable part” mainly refers to a painting robot arm part, a cable / hose support guide device of a painting machine, and the like.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, a resin molded body made of a polyvinyl chloride resin composition or a polyurethane-based elastomer has been generally used as a covering material for a movable part cable.
[0003]
However, the former has a problem that when it is exposed to various solvents such as toluene, it hardens or shrinks. Moreover, the latter was inferior in solvent resistance, such as remarkably swelling when exposed to a solvent.
[0004]
Accordingly, it is conceivable to use a resin, which is said to have excellent solvent resistance, such as polyethylene resin, fluororesin (containing fluorine-based elastomer), polyamide resin (polyamide-containing elastomer), etc. for the cable for the movable part. However, since these resins are poor in flexibility, they are not suitable for cables for movable parts.
[0005]
Further, the following proposals have been made according to the demand for solvent resistance (see Japanese Patent Application Laid-Open No. 59-160909). That is, a proposal has been made to use a material mainly composed of a linear ethylene copolymer of ethylene having limited density and melt index value and an α-olefin having 4 or more carbon atoms as a protective layer of the cable.
[0006]
However, although the linear ethylene copolymer is excellent in ESCR resistance and solvent resistance, it is still poor in flexibility and not suitable for cables for moving parts.
[0007]
[Object of invention]
An object of the present invention is to provide a solvent-resistant cable for a movable part that is excellent in flexibility, solvent resistance and wear resistance.
[0008]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above object, the present inventors have found that a molded product of a polyolefin composition obtained by mixing polyethylene and a specific partially crosslinked polyolefin elastomer has flexibility, It has been found that the sheath is excellent in solvent resistance and abrasion resistance, and the present invention has been achieved.
[0009]
The solvent-resistant cable for a movable part of the present invention is a cable in which a sheath is applied to the outer periphery of a plurality of insulated wire cores and the wire cores, and the sheath comprises (A) 30 to 70 parts by weight of polyethylene, (B) A polyolefin-based elastomer comprising 5 to 50% by weight of polypropylene and 95 to 50% by weight of an ethylene-α-olefin copolymer having a gel content (gel fraction) of 5 to 60% and an HDA hardness of 70 to 90 A molded body of a resin composition comprising 70 to 30 parts by weight, characterized in that it is made of a coating material having an HDD hardness of 30 to 40.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
(A) Polyethylene Examples of the polyethylene (A) used in the present invention include low density polyethylene, medium density polyethylene, high density polyethylene, ultra-low density polyethylene, and linear polyethylene. Although there is no particular limitation on the average molecular weight, it is approximately 1 × 10 3 to 5 × 10 4 . If it is less than 1 × 10 3 , the possibility of poor solvent resistance tends to occur, and if it exceeds 5 × 10 4 , the possibility that molding processability will deteriorate tends to occur.
[0011]
The blending amount is 30 to 70 parts by weight as described above. When the amount is less than 30 parts by weight, the solvent resistance and the wear resistance are not sufficient, and when the amount exceeds 70 parts by weight, the flexibility is deteriorated. In addition, a preferable range is 40-60 weight part.
[0012]
(B) Polyolefin Elastomer The polyolefin elastomer (B) used in the present invention comprises 5 to 50% by weight of polypropylene, an ethylene-α-olefin copolymer having a gel content of 5 to 60% and an HDA hardness of 70 to 90. It is composed of 95 to 50% by weight. When the gel content of the ethylene-α-olefin copolymer is less than 5%, the solvent resistance is poor. Conversely, when the gel content exceeds 60%, the solvent resistance is improved but the moldability is deteriorated. Moreover, when HDA hardness is less than 70, solvent resistance is bad, and when it exceeds 90, a softness | flexibility will worsen.
[0013]
As described above, the amount of the polyolefin-based elastomer (B) is 70 to 30 parts by weight with respect to 30 to 70 parts by weight of polyethylene. When it exceeds 70 parts by weight, the solvent resistance and wear resistance are not sufficient, and conversely, when it is less than 30 parts by weight, the flexibility becomes poor. In addition, a preferable range is 60 to 40 weight%.
[0014]
<Others>
A known antioxidant, copper damage inhibitor, flame retardant, lubricant, colorant, etc. may be used in combination with the solvent-resistant cable resin composition for movable parts made of polyethylene (A) and polyolefin elastomer (B). Can do.
[0015]
【The invention's effect】
The solvent-resistant cable for movable parts of the present invention has appropriate flexibility and excellent wear resistance. In addition, because of its excellent solvent resistance, it can be used for coating robot arm parts, cable / hose support guide devices of coating machines, etc. Nor will it harden or shrink.
[0016]
【Example】
Each of the resins and elastomers described in the following [Table 2] to [Table 6] are blended in proportions described in the same table, and uniformly mixed using a kneader such as an open roll or a kneader to obtain a resin. A composition was obtained. The details of the polypropylene content, ethylene-α-olefin content, gel fraction, and HDA hardness of each elastomer ( A to F, K to R ) are as shown in [Table 1].
[0017]
The obtained composition was press-pressed at 180 ° C. and 50 kgf / cm 2 for 5 minutes to form sheets having a thickness of 1 mm and 10 mm.
[0018]
Using this molded sheet, the HDD hardness and the weight change rate after immersion in toluene were measured.
[0019]
Further, the obtained composition was coated and formed as a sheath material with a 65 mm extruder, and the cable shown in FIG. 1 (PCCE-SB 2C × 0.5 mm 2 , instrumented crosslinked polyethylene insulated polyolefin sheath cable <braided shielded) >, Finished outer diameter: about 5.5 mm). A wear test was performed using this cable. The results are shown in [Table 2] to [Table 6].
[0020]
In addition, each operation method and evaluation method of (1) measurement of HDD hardness, (2) measurement of weight change rate after toluene immersion, and (3) abrasion resistance test are as follows.
[0021]
(1) Measurement of HDD hardness Using a press sheet of the sample 30 × 30 × 10 (mm), the hardness was measured in accordance with JIS K 7215 “Plastic Durometer Hardness Test Method”.
[0022]
(2) Measurement of weight change rate after immersion in toluene Using a press sheet of the sample 30 × 30 × 1 (mm), immerse in toluene at 50 ° C. for 3 hours, lightly wipe the surface toluene immediately after removal, and measure the weight. did. After that, it was dried under reduced pressure at 80 ° C. for 10 hours, the weight after drying was measured, and the weight change rate was determined by the following formula.
[0023]
Weight change rate (%) =
[{(Weight after immersion) − (weight after drying under reduced pressure)} / (weight after drying under reduced pressure)] × 100
[0024]
(3) Abrasion resistance test An abrasion test apparatus defined in UL-1581 (elevator cable abrasion test) was used. The blade edge shown in FIG. 2 is crimped to a cable mounted on a moving table, and the moving table is reciprocated to determine the number of movements when the sheath material wears and reaches the braided shield (moving stroke: 150 mm, moving speed: 30). Times / minute (counting one reciprocation as one time), load for crimping the blade edge to the cable: 760 gf), ◯ when the number of movements is 5,001 times or more, △ when it is 2,001 to 5,000 times, Those of 2,000 times or less were evaluated as x. Thus, it can be said that the greater the number of movements, the better the wear resistance.
[0025]
[Table 1]
[0026]
[Table 2]
[0027]
[Table 3]
[0028]
[Table 4]
[0029]
[Table 5]
[0030]
[Table 6]
[0031]
As is apparent from the results of [Table 2] to [Table 6], it can be seen that the solvent-resistant cable for movable parts of the present invention is excellent in wear resistance and solvent resistance, and also has good flexibility. That is, such a characteristic is obtained for the first time by the sheath material of each example in which polyethylene and a specific polyolefin-based elastomer are combined at a specific ratio. A cable that can be used even in a very severe place such as the above cannot be obtained at all.
[Brief description of the drawings]
FIG. 1 shows a cross-sectional view of a created cable.
FIG. 2 is a front view showing the shape of a blade edge used in an abrasion resistance test.
Claims (1)
(A)ポリエチレン30〜70重量部、
(B)ポリプロピレン5〜50重量%と、ゲル分が5〜60%でHDA硬度が70〜90であるエチレン−α−オレフィン共重合体95〜50重量%よりなるポリオレフィン系エラストマー70〜30重量部
からなる樹脂組成物の成形体であって、HDD硬度が30〜40である被覆材よりなることを特徴とする可動部用耐溶剤性ケーブル。A cable comprising a plurality of insulated wire cores and a sheath applied to the outer periphery of the wire core, the sheath comprising:
(A) 30 to 70 parts by weight of polyethylene,
(B) 70-30 parts by weight of a polyolefin elastomer comprising 5-50% by weight of polypropylene and 95-50% by weight of an ethylene-α-olefin copolymer having a gel content of 5-60% and an HDA hardness of 70-90 A solvent-resistant cable for a movable part, which is made of a coating material having a HDD hardness of 30 to 40.
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JP24519597A JP3956033B2 (en) | 1997-09-10 | 1997-09-10 | Solvent resistant cable for moving parts |
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JP24519597A JP3956033B2 (en) | 1997-09-10 | 1997-09-10 | Solvent resistant cable for moving parts |
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JPH1186637A JPH1186637A (en) | 1999-03-30 |
JP3956033B2 true JP3956033B2 (en) | 2007-08-08 |
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JP5416484B2 (en) * | 2009-06-03 | 2014-02-12 | 昭和電線ケーブルシステム株式会社 | Automotive antenna coaxial cable |
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