JPWO2016009904A1 - 熱収縮チューブ及び熱収縮キャップ並びに電線束の防水方法 - Google Patents
熱収縮チューブ及び熱収縮キャップ並びに電線束の防水方法 Download PDFInfo
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Abstract
Description
熱収縮温度における剪断速度1s−1の時の粘度が10Pa・s以下であるとともに、連続使用温度の最高温度における剪断速度1s−1の時の粘度が100Pa・s以上である樹脂より形成される低粘度接着剤層、及び、
熱収縮温度における剪断速度1s−1の時の粘度が200Pa・s以上の樹脂より形成される高粘度接着剤層を含み、
前記高粘度接着剤層が、熱収縮チューブの場合は、前記低粘度接着剤層の両側に、熱収縮キャップの場合は、前記低粘度接着剤層の少なくとも熱収縮キャップ開口部側に設けられている熱収縮チューブ又は熱収縮キャップである。
前記熱収縮チューブ又は熱収縮キャップが、内面に接着剤層を有し、
前記接着剤層が、
熱収縮温度における剪断速度1s−1の時の粘度が10Pa・s以下であるとともに、
連続使用温度の最高温度における剪断速度1s−1の時の粘度が100Pa・s以上である樹脂より形成される低粘度接着剤層、及び、
熱収縮温度における剪断速度1s−1の時の粘度が200Pa・s以上の樹脂より形成される高粘度接着剤層を含み、
前記高粘度接着剤層が、熱収縮チューブの場合は、前記低粘度接着剤層の両側に、熱収縮キャップの場合は、前記低粘度接着剤層の、少なくとも熱収縮キャップ開口部側に設けられている電線束の防水方法である。
本発明者は、従来の熱収縮チューブ又はキャップを用いる電線束の防水方法における前記の問題を解決するため鋭意検討した結果、内層接着剤層を、熱収縮時の温度(熱収縮温度)では粘度が低く素線間にも容易に浸透するとともに、熱収縮温度より低い温度では粘度が大きく増大する樹脂により構成することにより、防水部に被せて加熱収縮をするだけで電線露出部の防水とともに素線間止水もでき、かつ熱収縮時における樹脂の流出(はみだし)も抑制されている熱収縮チューブ又はキャップが得られることを見出し、第1の態様の発明を完成した。
本発明の第2の態様は、内面に接着剤層を有する熱収縮チューブ又は熱収縮キャップであって、前記接着剤層が、
熱収縮温度における剪断速度1s−1の時の粘度が10Pa・s以下であるとともに、連続使用温度の最高温度における剪断速度1s−1の時の粘度が100Pa・s以上である樹脂より形成される低粘度接着剤層、及び、
熱収縮温度における剪断速度1s−1の時の粘度が200Pa・s以上の樹脂より形成される高粘度接着剤層を含み、
前記高粘度接着剤層が、熱収縮チューブの場合は、前記低粘度接着剤層の両側に、熱収縮キャップの場合は、前記低粘度接着剤層の少なくとも熱収縮キャップ開口部側に設けられている熱収縮チューブ又は熱収縮キャップである。
高粘度接着剤層は、熱収縮時(熱収縮温度に達したとき)にも200Pa・s以上(剪断速度1s−1)の粘度を有するので、樹脂層の形状が熱収縮時にも保持される。より好ましくは、熱収縮時にも剪断速度1s−1の時の400Pa・s以上の粘度を有するものである。例えば、熱収縮温度として150℃が採用される場合には、150℃における粘度(剪断速度1s−1)が200Pa・s以上であり、好ましくは、150℃における粘度(剪断速度1s−1)が400Pa・s以上である。
第1の態様及び第2の態様における熱収縮チューブとは、加熱により径方向に収縮する性質を有するチューブであり、通常その両端が開口しており、ワイヤーハーネスの末端等にある電線露出部の防水等に用いられるものを言う。熱収縮キャップとは、熱収縮チューブであってその一端が熱収縮等によりすでに閉じられているものを言い、ワイヤーハーネスの末端にある電線露出部の防水等に用いられる。
本発明の第3の態様は、熱収縮チューブ又は熱収縮キャップを、複数の素線の束を絶縁被覆してなる電線を複数束ねてなる電線束の電線露出部に被せた後、前記熱収縮チューブ又は熱収縮キャップを熱収縮させる工程を有する電線束の防水方法であって
前記熱収縮チューブ又は熱収縮キャップが、内面に接着剤層を有し、
前記接着剤層が、
熱収縮温度における剪断速度1s−1の時の粘度が10Pa・s以下であるとともに、連続使用温度の最高温度における剪断速度1s−1の時の粘度が100Pa・s以上である樹脂より形成される低粘度接着剤層、及び、
熱収縮温度における剪断速度1s−1の時の粘度が200Pa・s以上の樹脂より形成される高粘度接着剤層を含み、
前記高粘度接着剤層が、熱収縮チューブの場合は、前記低粘度接着剤層の両側に、熱収縮キャップの場合は、前記低粘度接着剤層の、少なくとも熱収縮キャップ開口部側に設けられている電線束の防水方法である。
[実験に使用した素材]
1.熱収縮キャップ: 熱収縮キャップA 10/4×70L(材質:ポリエチレン、収縮前内径10mm、収縮前肉厚0.65mm、収縮後内径4mm、収縮後肉厚1.5mm、長さ70mm)
2.ワイヤーハーネス: AVSS0.5(導体:軟銅より線、絶縁体:塩化ビニル、素線数8本、素線径0.32mm、導体断面積0.56mm2、住友電装社製)を超音波溶接により7本をジョイントしたもの
(ポリアミド樹脂)
以下の条件にて測定した熱機械的分析(TMA)での軟化点が65℃であるポリアミド樹脂を用いた。
・装置:TMA−50(SHIMAZU社製)
・雰囲気:窒素、
・温度:25℃から150℃へ5℃/minで昇温
・0.5mmφの治具で押込み、荷重:10g
このポリアミド樹脂の150℃における剪断速度1s−1の時の粘度は9.4Pa・sであり、125℃における剪断速度1s−1の時の粘度は338.2Pa・sであった。
ポリエチレン樹脂:スミカセンL705(住友化学社製)を用いた。
このポリエチレン樹脂の、150℃における剪断速度1s−1の時の粘度は、3530Pa・sであった。
前記熱収縮キャップの内面に、前記ポリアミド樹脂を用いて製造した、内径8mm、厚さ0.4mm、長さ20mmのチューブを挿入し低粘度接着剤層を形成した。その後、低粘度接着剤層(ポリアミド樹脂の層)の開口部側に前記のポリエチレン樹脂を用いて製造した、内径8mm、厚さ0.4mm、長さ10mmのチューブを挿入し高粘度接着剤層を形成した。
このようにして得られた熱収縮キャップに、前記ワイヤーハーネスの一端部にある電線露出部を差し込んだ後、150℃×5分間加熱して熱収縮キャップを熱収縮させた。冷却後、当該端部を水中に浸漬し、ワイヤーハーネスを構成する7本の電線のそれぞれの他方の端部から0.2MPaの圧縮空気を入れ、エアリーク試験(空気漏れの有無:素線間止水試験)を行ったが、空気漏れはなかった。又、熱収縮による、熱収縮キャップ外への樹脂のはみ出しは観察されなかった。
実験1と同様にして、低粘度接着剤層のみを形成し、高粘度接着剤層を形成せずに熱収縮キャップを得た。この熱収縮キャップに、実験1と同様にして、前記ワイヤーハーネスの一端部にある電線露出部を差し込んだ後加熱して熱収縮キャップを熱収縮したが、熱収縮による、熱収縮キャップ外への樹脂のはみ出しが観察された。
前記のポリアミド樹脂の代わりに、150℃における剪断速度1s−1の時の粘度が47.5Pa・sであるポリアミド樹脂を用いた以外は、実験2と同様にして熱収縮キャップを作製し、前記ワイヤーハーネスの一端部にある電線露出部を差し込んだ後加熱して熱収縮キャップを熱収縮した。その後、エアリーク試験を行ったが空気漏れが生じた。
2 低粘度接着剤層
3 高粘度接着剤層
4 (低粘度接着剤層と高粘度接着剤層間の)隙間
5 電線露出部
6 ワイヤーハーネス
Claims (6)
- 内面に接着剤層を有する熱収縮チューブ又は熱収縮キャップであって、前記接着剤層が、熱収縮温度における剪断速度1s−1の時の粘度が10Pa・s以下であるとともに、連続使用温度の最高温度における剪断速度1s−1の時の粘度が100Pa・s以上である樹脂より形成される低粘度接着剤層を含む、熱収縮チューブ又は熱収縮キャップ。
- 前記低粘度接着剤層が、熱収縮温度より低い温度では固化するポリアミド樹脂又はエチレン−酢酸ビニル共重合樹脂を主体として形成されている請求項1に記載の熱収縮チューブ又は熱収縮キャップ。
- 内面に接着剤層を有する熱収縮チューブ又は熱収縮キャップであって、前記接着剤層が、熱収縮温度における剪断速度1s−1の時の粘度が10Pa・s以下であるとともに、連続使用温度の最高温度における剪断速度1s−1の時の粘度が100Pa・s以上である樹脂より形成される低粘度接着剤層、及び、
熱収縮温度における剪断速度1s−1の時の粘度が200Pa・s以上の樹脂より形成される高粘度接着剤層を含み、
前記高粘度接着剤層が、熱収縮チューブの場合は、前記低粘度接着剤層の両側に、熱収縮キャップの場合は、前記低粘度接着剤層の少なくとも熱収縮キャップ開口部側に設けられている熱収縮チューブ又は熱収縮キャップ。 - 前記高粘度接着剤層が、ポリエチレン樹脂又はエチレン−酢酸ビニル共重合樹脂を主体とし、熱収縮温度における剪断速度1s−1の時の粘度が400Pa・s以上の樹脂により構成されている請求項3に記載の熱収縮チューブ又は熱収縮キャップ。
- 熱収縮チューブ又は熱収縮キャップを、複数の素線の束を絶縁被覆してなる電線を複数束ねてなる電線束の電線露出部に被せた後、前記熱収縮チューブ又は熱収縮キャップを熱収縮させる工程を有する電線束の防水方法であって
前記熱収縮チューブ又は熱収縮キャップが、内面に接着剤層を有し、
前記接着剤層が、
熱収縮温度における剪断速度1s−1の時の粘度が10Pa・s以下であるとともに、連続使用温度の最高温度における剪断速度1s−1の時の粘度が100Pa・s以上である樹脂より形成される低粘度接着剤層、及び、
熱収縮温度における剪断速度1s−1の時の粘度が200Pa・s以上の樹脂より形成される高粘度接着剤層を含み、
前記高粘度接着剤層が、熱収縮チューブの場合は、前記低粘度接着剤層の両側に、熱収縮キャップの場合は、前記低粘度接着剤層の、少なくとも熱収縮キャップ開口部側に設けられている電線束の防水方法。 - 前記電線束が、自動車用ワイヤーハーネスである請求項5に記載の電線束の防水方法。
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