JP2015107646A - 天然繊維高分子複合体及び自動車内装材用の環境にやさしい軽量基材 - Google Patents
天然繊維高分子複合体及び自動車内装材用の環境にやさしい軽量基材 Download PDFInfo
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- JP2015107646A JP2015107646A JP2014242098A JP2014242098A JP2015107646A JP 2015107646 A JP2015107646 A JP 2015107646A JP 2014242098 A JP2014242098 A JP 2014242098A JP 2014242098 A JP2014242098 A JP 2014242098A JP 2015107646 A JP2015107646 A JP 2015107646A
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- isocyanate
- fibers
- natural fiber
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Abstract
【解決手段】 自動車用内装材用環境にやさしい軽量基材に関し、高温多湿な環境に弱い天然繊維を含むサンドイッチ構造の自動車内装材用基材の性能補完のために水分硬化型イソシアネート又はエポキシを添加し、天然繊維の水分の侵入による物性の低下を補完して天然繊維補強層の耐湿性と強度を改善し、熱可塑性発泡シート芯材層に熱ラミネーションを用いて連続的に基材が製造されることを特徴とする。本発明により製造された基材は、
【選択図】 図1
Description
耐湿弛み量(L)は「50mm×200mm×厚さ」及び「660g/m2」重量の試験片を、端部を70mm固定させ、反対側の部分に40mm×60mmの34.2gの錘を置き、底面から試験片の下まで測定した初期高さ(L1)と、50℃、95RH%の湿度で7時間放置した後、再び測定した後期高さ(L2)の差L=L1−L2と測定される)。
1.イソシアネート:4、4’-methylenediphenyl diisocyanate、PIUSYS社製)
2.天然繊維:kenaf(平均直径70μm、長さ60〜80mm)
3.熱可塑性高分子:ポリプロピレン(韓国ファイバ社製、直径6D、長さ51mm)、ポリエステル繊維(Woongjinケミカル社製、直径6D、長さ51mm)
<実施形態1:天然繊維/高分子複合体の製造>
本発明に係る天然繊維/高分子複合体の製造は、下記の工程順序に基づき、表1のような混合物の割合で行った。成形条件は、熱間圧着温度200℃、熱間圧着時間60秒、冷間圧着温度23℃、冷間圧着時間60秒にした。
i)天然繊維と熱可塑性高分子繊維のミキシング、オープニング、カーディング、ウェブフォーミング及びニードルパンチ工程を経て天然繊維/高分子フェルトを製造する。ii)前記フェルトにイソシアネートをスプレー塗布或いはローラに付けて1〜30phrを添加した後、熱間圧着ローラによってイソシアネートを半硬化状態に成形する。iii)その上に熱可塑性高分子パウダを塗布した後、再び熱間圧着ローラによってイソシアネートの硬化を完了し、熱可塑性高分子パウダ層を形成して天然繊維/高分子複合体を製造する。
実施形態1で製造された天然繊維/高分子複合体に対してイソシアネートの含有量による引張強度を図1に示した。図1から分かるように、イソシアネートを添加しない方よりも5%添加した場合に約23%、10%添加した場合に約38%引張強度が高く測定された。
実施形態1で製造された天然繊維高分子複合体に対してイソシアネート層の適用前後による耐湿性の評価を耐湿時間によるモーフォロジと引張強度の変化を通じて行った。図2は、イソシアネートの添加前後に耐湿時間による天然繊維高分子複合体の表面モーフォロジを示している。図2から分かるように、イソシアネートを塗布した後の方が塗布前よりも耐湿時間によって表面が損傷する現象が顕著に少なく発生することが確認できる。
20 芯材層
30 自動車内装材用の環境にやさしい軽量基材
Claims (15)
- 天然繊維と熱可塑性高分子繊維の混合物からなるフェルトを製造する段階と、
前記フェルトの表面に液状イソシアネートを噴霧又は塗布する段階と、
前記液状イソシアネートが噴霧されたフェルトを熱間圧着して硬化することによってシート状にする硬化段階と
を含むことを特徴とする天然繊維高分子複合体の製造方法。 - 前記天然繊維は、セルロース系繊維であることを特徴とする請求項1に記載の天然繊維高分子複合体の製造方法。
- 前記イソシアネートは、MDI又はTDIであることを特徴とする請求項1に記載の天然繊維高分子複合体の製造方法。
- 前記硬化段階では、
前記熱間圧着によって前記イソシアネートが半硬化状態となるようにシート化した後、前記フェルトの表面に熱可塑性高分子パウダを塗布した後、冷間圧着によってイソシアネートの硬化を完了することを特徴とする請求項1に記載の天然繊維高分子複合体の製造方法。 - 天然繊維と合成繊維でフェルトを製造する第1段階と、
前記フェルトにイソシアネートを塗布した後、熱間圧着ローラを用いて前記イソシアネートを半硬化状態に成形してシートを製造する第2段階と、
前記シートに熱可塑性パウダを塗布した後、加熱することによって前記シートの表面に熱可塑性パウダ層を形成し、前記イソシアネート硬化反応を完了し、これを圧着することによって薄膜補強層を製造する第3段階と、
前記製造された薄膜補強層を熱可塑性発泡シートからなる芯材層の一面或いは両面に熱ラミネーション工程を通じて連続的に積層する第4段階と
を含むことを特徴とする自動車内装材用の環境にやさしい軽量基材の製造方法。 - 前記熱可塑性発泡シートは、ポリプロピレン、ポリエチレン又はポリエステルであり、発泡倍率は5倍〜40倍であり、厚さは2mm〜10mmであることを特徴とする請求項5に記載の自動車内装材用の環境にやさしい軽量基材の製造方法。
- 前記イソシアネートは、メチレンジフェニルジイソシアネート(MDI)又はトルエンジイソシアネート(TDI)であることを特徴とする請求項5に記載の自動車内装材用の環境にやさしい軽量基材の製造方法。
- 前記薄膜補強層に含まれているイソシアネートの重量は、5g/m2〜100g/m2であることを特徴とする請求項5に記載の自動車内装材用の環境にやさしい軽量基材の製造方法。
- 前記薄膜補強層の厚さは0.5mm〜2mmであり、重量は120g/m2〜700g/m2であることを特徴とする請求項5に記載の自動車内装材用の環境にやさしい軽量基材の製造方法。
- 前記薄膜補強層に用いられる合成繊維は、長さが30〜100mmであるポリプロピレン繊維、芯鞘型低融点ポリエステル繊維、ポリエステル繊維、ポリエチレン繊維、アクリル繊維又は生分解性繊維の中から選択された1種又はそれ以上を用いることを特徴とする請求項5に記載の自動車内装材用の環境にやさしい軽量基材の製造方法。
- 前記薄膜補強層に用いられる合成繊維の含有量は、30重量%〜70重量%であることを特徴とする請求項5に記載の自動車内装材用の環境にやさしい軽量基材の製造方法。
- 前記薄膜補強層に用いられる天然繊維は、長さが30mm〜100mmであるケナフ、黄麻、亜麻、大麻、竹又はシザルの中から1種以上選択されることを特徴とする請求項5に記載の自動車内装材用の環境にやさしい軽量基材の製造方法。
- 前記熱可塑性パウダは、低密度ポリエチレン、高密度ポリエチレン又はポリプロピレンの中から選択された1種又はそれ以上を用いることを特徴とする請求項5に記載の自動車内装材用の環境にやさしい軽量基材の製造方法。
- 請求項5〜13の何れか一項に記載の製造方法により製造されたことを特徴とする自動車内装材用の環境にやさしい軽量基材。
- 以下の基準による耐湿屈曲強度が1.0kgf/5cm超過、耐湿弛み量(L)が2.0mm以下であることを特徴とする自動車内装材用の環境にやさしい軽量基材。
(このとき、耐湿屈曲強度(kgf/5cm)は「50mm×150mm×厚さ」及び「660g/m2」重量の試験片に対して、試験速度5mm/min、スパン幅(span width)100mmにし、50℃、95RH%の湿度で24時間放置した後、23℃、95RH%で1時間安定化させた後、ASTM D790により測定した値であり、
耐湿弛み量(L)は「50mm×200mm×厚さ」及び「660g/m2」重量の試験片を、端部を70mm固定させ、反対側の部分に40mm×60mmの34.2gの錘を置き、底面から試験片の下まで測定した初期高さ(L1)と、50℃、95RH%の湿度で7時間放置した後、再び測定した後期高さ(L2)の差L=L1−L2と測定される)。
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KR101845443B1 (ko) * | 2016-06-07 | 2018-04-04 | 현대자동차주식회사 | 천연복합소재 다층구조물 및 그의 제조방법 |
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Also Published As
Publication number | Publication date |
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JP5992982B2 (ja) | 2016-09-14 |
US20150158269A1 (en) | 2015-06-11 |
CN104691074B (zh) | 2017-04-12 |
CN104691074A (zh) | 2015-06-10 |
EP2881249B1 (en) | 2016-07-06 |
EP2881249A1 (en) | 2015-06-10 |
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