JPWO2014010509A1 - 耐熱難燃性樹脂組成物及び絶縁電線、チューブ - Google Patents
耐熱難燃性樹脂組成物及び絶縁電線、チューブ Download PDFInfo
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Abstract
Description
・テトラフルオロエチレン−プロピレン共重合体:アフラス150C(旭硝子社製)
・ビニリデンフルオライド−ヘキサフルオロプロピレン共重合体:カイナー2750(アルケマ社製)
・ランダムポリプロピレン:ノバテックPP EG6D(融点145℃)(日本ポリプロ社製)
・ブロックポリプロピレン:日本ポリプロ・ノバテックPP EC7(融点160℃)(日本ポリプロ社製)
・炭酸カルシウム:ソフトン2200(白石カルシウム社製、重質炭酸カルシウム)
・臭素系難燃剤:SAYTEX BT−93(Albemarle Corporation製、エチレンビステトラブロモフタルイミド)
・三酸化アンチモン:三酸化アンチモンMSA(山中産業社製、平均粒径1μm)
表1又は表2に示す配合(表中では質量部で表す。)をオープンロールにて混練し、ペレタイザによってペレット化した後、電線被覆用押出機に供給して、押出機により、TA12/0.18の導体に、絶縁外径1.5mmφ(被覆の厚み:0.375mm)で押出し被覆した。その後、電子線照射装置で100kGyの電子線を照射し、架橋された樹脂組成物で絶縁被覆された絶縁電線を製造した。このようにして得られた絶縁電線について、以下に示す方法で、引張特性(引張強度、引張伸び)、耐熱性、難燃性、絶縁性、耐油性、カットスルー特性の評価を行った。結果を表1及び表2に示す。
JIS C 3005(1986)に準拠して引張強度及び引張伸び測定した。(基準:引張強度≧8MPa、引張伸び≧100%)
絶縁電線を、250℃に保持された恒温槽内に4日間放置した後取り出し、JIS C3005(1986)に準拠して引張強度及び引張伸び測定した、その測定値より引張強度残率、引張伸び残率をそれぞれ計算した。(基準:引張強度残率≧85%、引張伸び残率≧85%)
UL1581 1080.に準拠した垂直燃焼試験(UL VW−1 燃焼試験)により評価した。具体的には、絶縁電線を垂直に保持し、20度の角度でバーナの炎をあて15秒着火、15秒休止を5回繰り返した後、燃焼持続(残炎による燃焼)が、60秒以下のとき「合格」、60秒を超えるとき「不合格」とした。
体積固有抵抗測定装置にて、体積固有抵抗値(Ω・cm)を測定した。(基準:≧10の15乗)
絶縁電線を、IRM902油に、70℃で4時間浸漬した後取り出し、JIS C3005(1986)に準拠して引張強度及び引張伸び測定した、その測定値より引張強度残率、引張伸び残率をそれぞれ計算した。(基準:引張強度残率≧50%、引張伸び残率≧50%)
図1に示す測定装置を用いてカットスルー特性を測定した。図1中、1は導体を、2は絶縁被覆を、3は絶縁電線を表す。絶縁電線3の上に90°シャープエッジ(先端R=0.125mm、先端角度90°)を有する刃4(5mil刃)を当て、導体1とシャープエッジとの間に流れる電流値を測定する。初期状態では導体1とシャープエッジとは絶縁被覆2により絶縁されており電流は流れないが、絶縁被覆2が刃4によって切断されると導体1とシャープエッジとの間に電流が流れる。刃4に荷重を加え、絶縁被覆2が切断されないで耐える最大荷重を測定する。なお試験雰囲気は温度23℃、湿度50%RHとする。荷重150N以上を基準(合格レベル)とした。
2)ビニリデンフルオライド−ヘキサフルオロプロピレン共重合体の混合比が、テトラフルオロエチレン−α−オレフィン共重合体とビニリデンフルオライド−ヘキサフルオロプロピレン共重合体の合計に対し20質量%未満の場合(比較例6)は、耐油性(引張伸び残率)が低い。
3)フッ素ゴム組成物とランダムポリプロピレンの合計に対しランダムポリプロピレンの混合比が、10質量%未満の場合(比較例3)は、カットスルー特性が低い。
4)フッ素ゴム組成物の混合比が60質量%未満の場合(比較例1、すなわち、ランダムポリプロピレンの混合比が40質量%を超える場合)は、耐熱性が低い。
5)ランダムポリプロピレンの代わりにブロックポリプロピレンを用いた場合(比較例5)は、引張特性、耐熱性、耐油性及びカットスルー特性が低い。
6)無機充填剤(重質炭酸カルシウム)の配合量が10質量部未満の場合(比較例2)は、耐熱性、難燃性が低い。一方、100質量部を超える場合(比較例4)は、引張特性(引っ張り伸び)が低く又耐熱性(引張伸び残率)も低い。
表3に示す配合(表中では質量部で表す。)をオープンロールにて混練し、ペレタイザによってペレット化した後、電線被覆用押出機に供給して、押出機により、TA12/0.18の導体に、絶縁外径1.5mmφ(被覆の厚み:0.375mm)で押出し被覆した。その後、電子線照射装置で100kGyの電子線を照射し、架橋された樹脂組成物で絶縁被覆された絶縁電線を製造した。このようにして得られた絶縁電線について、実施例1〜3と同様な方法で、引張特性(引張強度、引張伸び)、難燃性、絶縁性、耐油性、カットスルー特性の評価を行った。又、下記の方法で連続耐熱温度(耐熱性)及び圧着加工性を測定した。結果を表3に示す。
前記の自動車規格(JASO)の連続耐熱温度により耐熱性を判定した。具体的には、230℃、250℃、270℃、290℃の各温度で老化試験を行い、引張伸びが100%を切るまでの時間を求め、アレニウスプロットを行うことにより連続耐熱温度を求めた。
日本圧着端子製造社製の圧着端子(型番SNAC3−A021T−M064)及び圧着機(型番AP−K2N)を用いて試作した電線の末端のカシメ加工を行い、顕微鏡で絶縁割れの有無を観察した。割れのあるものは不合格、割れのないものを合格とした。
2. 絶縁被覆
3. 絶縁電線
4. (シャープエッジの)刃
Claims (6)
- テトラフルオロエチレン−α−オレフィン共重合体及びビニリデンフルオライド−ヘキサフルオロプロピレン共重合体からなるフッ素ゴム組成物とランダムポリプロピレンとの混合物100質量部に対して無機充填剤を10〜100質量部を配合し、さらに電離放射線を照射して前記フッ素ゴム組成物及びランダムポリプロピレンを架橋してなる樹脂組成物であって、前記テトラフルオロエチレン−α−オレフィン共重合体とビニリデンフルオライド−ヘキサフルオロプロピレン共重合体との混合比が80:20〜40:60(質量比)であり、かつ前記フッ素ゴム組成物とランダムポリプロピレンとの混合比が60:40〜90:10(質量比)であることを特徴する耐熱難燃性樹脂組成物。
- テトラフルオロエチレン−α−オレフィン共重合体及びビニリデンフルオライド−ヘキサフルオロプロピレン共重合体からなるフッ素ゴム組成物とランダムポリプロピレンとの混合物100質量部に対して、10質量部未満の無機充填剤及び3〜20質量部の難燃剤を配合し、さらに電離放射線を照射して前記フッ素ゴム組成物及びランダムポリプロピレンを架橋してなる樹脂組成物であって、前記テトラフルオロエチレン−α−オレフィン共重合体とビニリデンフルオライド−ヘキサフルオロプロピレン共重合体との混合比が80:20〜40:60(質量比)であり、かつ前記フッ素ゴム組成物とランダムポリプロピレンとの混合比が60:40〜90:10(質量比)であることを特徴する耐熱難燃性樹脂組成物。
- テトラフルオロエチレン−α−オレフィン共重合体が、テトラフルオロエチレン−プロピレン共重合体であることを特徴とする請求項1又は請求項2に記載の耐熱難燃性樹脂組成物。
- 前記無機充填剤が、炭酸カルシウムであることを特徴とする請求項1ないし請求項3のいずれか1項に記載の耐熱難燃性樹脂組成物。
- 導体上に、請求項1ないし請求項4のいずれか1項に記載の耐熱難燃性樹脂組成物からなる被覆層を有する絶縁電線。
- 請求項1ないし請求項4のいずれか1項に記載の耐熱難燃性樹脂組成物がチューブ状に成形されてなることを特徴とする熱収縮チューブ。
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