JP6040146B2 - ポリエステル織物およびその製造方法 - Google Patents
ポリエステル織物およびその製造方法 Download PDFInfo
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- JP6040146B2 JP6040146B2 JP2013500008A JP2013500008A JP6040146B2 JP 6040146 B2 JP6040146 B2 JP 6040146B2 JP 2013500008 A JP2013500008 A JP 2013500008A JP 2013500008 A JP2013500008 A JP 2013500008A JP 6040146 B2 JP6040146 B2 JP 6040146B2
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Description
[計算式1]
耐熱定数(X)=(T×t)/(600×D)
前記計算式1において、Tは、自由落下させるホット−ロッドの温度であって、350〜750℃の温度範囲を有し、tは、前記ホット−ロッドを自由落下させ、前記ホット−ロッドがポリエステル織物と接触した後から前記ポリエステル織物を通過するまでにかかった時間(sec)を示し、Dは、前記ポリエステル織物の厚度(mm)を示す。
[計算式1]
耐熱定数(X)=(T×t)/(600×D)
前記計算式1において、Tは、自由落下させるホット−ロッドの温度であって、350〜750℃の温度範囲を有し、tは、前記ホット−ロッドを自由落下させ、前記ホット−ロッドがポリエステル織物と接触した後から前記ポリエステル織物を通過するまでにかかった時間(sec)を示し、Dは、前記ポリエステル織物の厚度(mm)を示す。
所定の固有粘度を有するPETチップを、溶融放射機を介して1ステップ(step)としてポリエステル繊維を製造した後に、前記原糸を用い、レピア織機を介してエアバッグ用織物生地を製織し、精練およびテンタリング工程を経て、ポリエステル織物を製造した。
ゴム成分がコーティング処理前の非コーティングされたポリエステル織物およびゴム成分コーティングされたポリエステル織物を用い、それぞれの厚度(D)を米国材料試験協会規格ASTMD1777によって測定した。
ゴム成分がコーティング処理前の非コーティングされたポリエステル織物およびゴム成分コーティングされたポリエステル織物を用い、それぞれの試験片で横50mm×縦50mmを裁断した後、図2に示したような、ホット−ロッドテスタ(hot rod tester)装置に前記試験片を装着した。また、前記テスタ装置において、ホット−ロッド(スチール材質、直径10mm、長さ82mm、重量50g、熱伝導率55W/m・K)を昇温速度20℃/minで加熱し、それぞれ450℃および600℃の温度(T)に熱した後に、前記試験片から距離(d)が76mm程度離れるように試験片の上側方向に配置し、前記位置からホット−ロッドを試験片側に自由落下させた。このように自由落下させたホット−ロッドが試験片を接触した後から試験片を完全に通過するまでの時間(t、sec)を測定し、下記計算式1によって耐熱定数値を計算した。
[計算式1]
耐熱定数(X)=(T×t)/(600×D)
前記計算式1において、Tは、自由落下させるホット−ロッドの温度であって、350〜750℃の温度範囲を有し、tは、前記ホット−ロッドを自由落下させ、前記ホット−ロッドがポリエステル織物と接触した後から前記ポリエステル織物を通過するまでにかかった時間(sec)を示し、Dは、前記ポリエステル織物の厚度(mm)を示し、コーティング織物の場合、コーティング層を含む織物の厚度(mm)を示す。
下記計算式2によって強靭性(Toughness、J/m3)値を計算した。
コーティング処理前の非コーティングされた織物およびコーティング処理後のコーティングされた織物を用い、それぞれの試験片で横75mm×縦200mmを裁断した後、前記試験片の上側と下側のそれぞれを米国材料試験協会規格ASTMD2261TONGUEによる装置で上端および下端の噛合装置面(jaw face)の左右空間の間に位置させ、前記噛合装置面(jaw face)の間隔を基準とし、76mm/min、300mm/minの引裂速度でエアバッグ用織物の引裂強度を測定した。
コーティング処理前の非コーティングされた織物で試験片を裁断し、米国材料試験協会規格ASTMD5034による引張強度測定装置の下部クランプに固定させ、上部クランプを上に移動させながらエアバッグ織物の試験片が破断する時の強度および伸度を測定した。
米国材料試験協会規格ASTMD1776によって経糸/緯糸方向の織物収縮率を測定した。まず、コーティング処理前の非コーティングされた織物で試験片を裁断した後、経糸および緯糸方向に収縮前の長さの20cmずつを表示し、149℃で1時間チャンバで熱処理した試験片の収縮した長さを測定し、経糸方向および緯糸方向の布収縮率{(収縮前の長さ−収縮後の長さ)/収縮前の長さ×100%}を測定した。
コーティング処理前の非コーティングされた織物に対し、米国材料試験協会規格ASTMD4032による剛軟度測定装置を用い、サーキュラベンド(Circular Bend)法で織物の剛軟度を測定した。また、剛軟度測定法でカンチレバー法を適用することができ、織物に曲げを与えるために一定角度の傾斜を与えた試験台のカンチレバー測定機器を用い、織物の曲げ長さの測定を通じて剛軟度を測定することができる。
米国材料試験協会規格ASTMD737により、コーティング処理前の非コーティングされた織物を、20℃、65%RH下で1日以上放置した後、ΔPがそれぞれ125paおよび500paの圧力の空気が38cm2の円形断面を通過する量を測定し、静的空気透過度として示した。
下記表3に記載された条件を除いては、実施例1〜5と同様の方法によって比較例1〜5のポリエステル織物を製造した。
Claims (13)
- 米国材料試験協会規格ASTMD885の方法で測定したモジュラス(Young’s modulus)が伸度1%で60〜100g/deであり、伸度2%で20〜60g/deであり、乾熱収縮率が1.0%〜6.5%であり、単糸繊度が2.5DPF〜6.8DPFであり、かつ、固有粘度が1.1〜1.2dl/gであるポリエステル繊維を含み、
米国材料試験協会規格ASTMD1777によって測定した織物の厚度は、0.18〜0.43mmであり、
下記計算式1で定義される耐熱定数(X)は、自由落下させるホット−ロッドの温度(T)が600℃である場合に、1.5〜1.8であることを特徴とする、ポリエステル織物。
[計算式1]
耐熱定数(X)=(T×t)/(600×D)
(前記計算式1において、
Tは、自由落下させるホット−ロッドの温度であって、
前記ホット−ロッドは、熱伝導率55W/m・Kのスチール材質であり、重量が50gであり、直径10mm、長さ82mmの円柱形状であり、
tは、前記ホット−ロッドをポリエステル織物から距離(d)が76mm離れるように前記織物の上側方向に配置し、この位置から織物側方向に前記ホット−ロッドを、長手方向を鉛直方向として自由落下させ、前記ホット−ロッドの平坦な円形状の端面がポリエステル織物と接触した後から前記ポリエステル織物を通過するまでにかかった時間(sec)を示し、
Dは、前記ポリエステル織物の厚度(mm)を示す。) - 前記ホット−ロッドの温度(T)が450℃である場合、前記計算式1で定義される耐熱定数(X)は2.7〜3.0である、請求項1に記載のポリエステル織物。
- 前記ポリエステル繊維の引張強度が8.8〜10.0g/dである、請求項1または2に記載のポリエステル織物。
- 米国材料試験協会規格ASTMD885の方法で測定したモジュラス(Young’s modulus)が伸度1%で75〜95g/deであり、伸度2%で22〜55g/deであることを特徴とする、請求項1〜3のいずれかに記載のポリエステル繊維を含むポリエステル織物。
- 前記ポリエステル繊維は、切断伸度が14%〜23%で、溶融熱容量(ΔH)が40〜65J/gであることを特徴とする、請求項1〜4のいずれかに記載のポリエステル織物。
- 前記織物は、400〜650デニールの総繊度を有するポリエステル繊維糸を含むものであることを特徴とする、請求項3〜5のいずれかに記載のポリエステル織物。
- 前記ポリエステル織物上に形成されたゴム成分のコーティング層を含み、前記ホット−ロッドがゴム成分のコーティング層を含むポリエステルコーティング織物と接触した後から前記ポリエステルコーティング織物を通過するまでにかかった時間(t、sec)を測定し、前記ゴム成分のコーティング層を含むポリエステルコーティング織物の厚度(D、mm)を測定して、前記計算式1に基づいて、コーティングされたポリエステル織物の耐熱定数が算測され、
前記ホット−ロッドの温度(T)が450℃である場合、コーティングされたポリエステル織物の耐熱定数が6.22〜10.9であり;前記ホット−ロッドの温度(T)が600℃である場合、コーティングされたポリエステル織物の耐熱定数が5.6〜9.7であることを特徴とする、請求項1〜6のいずれかに記載のポリエステル織物。 - 前記ゴム成分は、粉末(powder)型シリコーン、液状(liquid)型シリコーン、ポリウレタン、クロロフルオレン、ネオプレンゴム、およびエマルジョン型シリコーン樹脂からなる群より選択された1種以上であることを特徴とする、請求項7に記載のポリエステル織物。
- 前記ゴム成分の単位面積あたりのコーティング量が20〜200g/m2であることを特徴とする、請求項7または8に記載のポリエステル織物。
- 請求項1〜9のいずれか1項に記載のポリエステル織物を含むことを特徴とする、車両用エアバッグ。
- 前記エアバッグは、フロンタル用エアバッグまたはサイドカーテン型エアバッグであることを特徴とする、請求項10に記載の車両用エアバッグ。
- 固有粘度が1.5〜2.0dl/gのポリエステル重合体を293〜295℃で溶融紡糸してポリエステル未延伸糸を製造するステップと、
前記ポリエステル未延伸糸を延伸してポリエステル繊維を製造するステップと、
前記ポリエステル繊維でエアバッグ用生地を製織するステップと、
前記製織されたエアバッグ用生地を精練するステップと、
前記精練された織物をテンタリングするステップとを含み、
前記ポリエステル繊維は、米国材料試験協会規格ASTMD885の方法で測定したモジュラス(Young’s modulus)が伸度1%で60〜100g/deであり、伸度2%で20〜60g/deであり、乾熱収縮率が1.0%〜6.5%であり、単糸繊度が2.5DPF〜6.8DPFであり、
得られた織物は、
米国材料試験協会規格ASTMD1777によって測定した織物の厚度が、0.18〜0.43mmであり、
下記計算式1で定義される耐熱定数(X)が、自由落下させるホット−ロッドの温度(T)が600℃である場合に1.5〜1.8であることを特徴とする、ポリエステル織物の製造方法。
[計算式1]
耐熱定数(X)=(T×t)/(600×D)
(前記計算式1において、
Tは、自由落下させるホット−ロッドの温度であって、
前記ホット−ロッドは、熱伝導率55W/m・Kのスチール材質であり、重量が50gであり、直径10mm、長さ82mmの円柱形状であり、
tは、前記ホット−ロッドをポリエステル織物から距離(d)が76mm離れるように前記織物の上側方向に配置し、この位置から織物側方向に前記ホット−ロッドを、長手方向を鉛直方向として自由落下させ、前記ホット−ロッドの平坦な円形状の端面がポリエステル織物と接触した後から前記ポリエステル織物を通過するまでにかかった時間(sec)を示し、
Dは、前記ポリエステル織物の厚度(mm)を示す。) - 前記延伸が、延伸比5.99〜6.15で行われることを特徴とする、請求項12に記載のポリエステル織物の製造方法。
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