JP2015131394A - 繊維強化熱可塑性樹脂一体化構造体 - Google Patents
繊維強化熱可塑性樹脂一体化構造体 Download PDFInfo
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Abstract
Description
本発明に係る繊維強化熱可塑性樹脂一体化構造体では、例えば図1(A)、(B)に示すように、繊維強化熱可塑性樹脂成形体(I)1と被接着体(II)2を溶着により接合して一体化した繊維強化熱可塑性樹脂一体化構造体3を製造するに際し、繊維強化熱可塑性樹脂成形体(I)1として連続繊維もしくは強化繊維がランダムに配向された成形体が用いられ、繊維強化熱可塑性樹脂成形体(I)と被接着体(II)を構成する熱可塑性樹脂がポリアミド(例えば、ナイロン樹脂)であって、酸化防止剤(例えば、無機系の酸化防止剤、とくに、ハロゲン化銅あるいはその誘導体、中でも、ヨウ化銅あるいはその誘導体)を含む。
本発明における強化繊維として用いた不連続繊維マット1について説明する。
炭素繊維1を繊維長15mmにカットし、カットした炭素繊維とナイロン6短繊維(短繊維繊度1.7dtex、カット長51mm、捲縮数12山/25mm、捲縮率15%)を質量比で80:20の割合で混合して繊維集合体を作製し、その繊維集合体をカーディング装置に投入した。カーディング装置から出てきたウェブをクロスラップし、炭素繊維とナイロン6繊維とからなる目付100g/cm2のシート状の炭素繊維シートを形成した。得られた炭素繊維シートをプレス機に設置し、20MPaの圧力で5秒間加圧し不連続繊維マット1を得た。
用いた熱可塑樹脂組成物を表1に示す。
次にスタンパブル基材について説明する。
前記した不連続繊維マット1の巻取り方向を0°とし、不連続繊維マット1を12枚、(0°/90°/0°/90°/0°/90°)sとなるように積層し、さらに積層した不連続繊維マット1中の炭素繊維と熱可塑性樹脂組成物の重量比が50:50となるように熱可塑性樹脂組成物フィルムを積層した後に、全体をステンレス板で挟み、260℃で90秒間予熱後、2.0MPaの圧力をかけながら180秒間、240℃にてホットプレスした。ついで、加圧状態で50℃まで冷却し、厚さ2mmのスタンパブル基材を得た。繊維強化熱可塑性樹脂スタンパブル基材中の炭素繊維の配合量は、成形方法、用途等によって異なる。しかし、コストパフォーマンスの観点から10〜90 質量%の範囲が好ましく、30〜70質量%がより好ましい。なお、炭素繊維強化熱可塑性樹脂スタンパブル基材に対する炭素繊維の配合量は、ポリアミド樹脂フィルムと炭素繊維とを任意の割合で積層することにより調整することができる。
スタンパブル基材から約2gのサンプルを切り出し、その質量を測定した。その後、サンプルを500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばした。室温まで冷却してから、残った炭素繊維の質量を測定した。炭素繊維の質量に対する、マトリックス樹脂等の有機物を焼き飛ばす前のサンプルの質量に対する比率を測定し、炭素繊維の含有率とした。
繊維径7μm、引張弾性率230GPaでフィラメント数が12000本の連続した炭素繊維束に対し、ポリエチレングリコールジグリシジルエーテル100%成分(分子量=670)の水系サイジング剤を炭素繊維束に1.0重量%付着させ炭素繊維1を得た。
上記のような接合部における接合強度(引張強さ)は、例えば図4に示すようなラップシア試験(せん断試験)(JIS K6851(1994))によって測定することができる。図4に示す試験方法においては、シート状の繊維強化熱可塑性樹脂成形体(I)1と被接着体(II)2とを接合部31で超音波溶着により接合一体化し、繊維強化熱可塑性樹脂成形体(I)1の端部および被接着体(II)2の端部を引張試験機のチャック部32、33で把持して、引張試験機により接合部31にせん断荷重を加えるように、繊維強化熱可塑性樹脂成形体(I)1と被接着体(II)2を互いに反対方向に引っ張り、接合部31に破断あるいは所定量以上の変形(例えば界面破壊)が生じるときの引張強さを測定することにより、接合強度を定量的に測定することが可能である。シート状の繊維強化熱可塑性樹脂成形体(I)1と被接着体(II)2とのラップ代(接合代)は12.5mm、各試験片の長さは100mm、幅25mm、厚さ2.0mm、各チャック部の長さは37.5mmに設定した。
寸法300mm×400mm×2mmのスタンパブル基材を、基材中心温度が260℃になるまで予熱後、150℃に昇温したプレス盤に配し、10MPaで30秒間加圧してスタンピング成形することで繊維強化熱可塑性樹脂成形体を得た。得られた繊維強化熱可塑性樹脂成形体を用いて溶着試験を行った。
繊維強化熱可塑性樹脂成形体(I)と被接着体(II)を溶着により接合して一体化し
た繊維強化熱可塑性樹脂一体化構造体を製造する方法として、幅25mm、溶着代12.5mmの面に1.6MPaの面圧を加えて振動溶着により溶着を行った。
2 被接着体(II)
3 繊維強化熱可塑性樹脂一体化構造体
31 接合部
32、33 引張試験機のチャック部
Claims (6)
- 繊維強化熱可塑性樹脂成形体(I)と被接着体(II)を溶着により接合して一体化した繊維強化熱可塑性樹脂一体化構造体において、前記繊維強化熱可塑性樹脂成形体(I)の強化繊維が連続繊維もしくはランダムに配向された強化繊維であり、前記繊維強化熱可塑性樹脂成形体(I)および被接着体(II)を構成する熱可塑性樹脂がポリアミドであって、少なくとも前記繊維強化熱可塑性樹脂成形体(I)が酸化防止剤を含むことを特徴とする繊維強化熱可塑性樹脂一体化構造体。
- 前記繊維強化熱可塑性樹脂成形体(I)の強化繊維が連続繊維もしくは数平均繊維長が3〜100mmの範囲にある強化繊維からなる、請求項1に記載の繊維強化熱可塑性樹脂一体化構造体。
- 前記繊維強化熱可塑性樹脂成形体(I)の強化繊維が炭素繊維、ガラス繊維、アラミド繊維のいずれかから選ばれる1つ以上からなる、請求項1または2に記載の繊維強化熱可塑性樹脂一体化構造体。
- 前記熱可塑性樹脂が、ポリアミド100重量部に対して、無機系の酸化防止剤が0.01〜1重量部配合されたものからなる、請求項1〜3のいずれかに記載の繊維強化熱可塑性樹脂一体化構造体。
- 前記無機系の酸化防止剤がハロゲン化銅あるいはその誘導体から構成されている、請求項4に記載の繊維強化熱可塑性樹脂一体化構造体。
- 前記溶着が、振動溶着、超音波溶着、熱板溶着、誘導加熱、誘電加熱、スピン溶着およびレーザー溶着からなる群より選択される少なくとも一つにより行われている、請求項1〜5のいずれかに記載の繊維強化熱可塑性樹脂一体化構造体。
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US10583617B2 (en) | 2016-11-28 | 2020-03-10 | General Electric Company | Automatic systems and methods for stacking composite plies |
US11572124B2 (en) | 2021-03-09 | 2023-02-07 | Guerrilla Industries LLC | Composite structures and methods of forming composite structures |
US11745443B2 (en) | 2017-03-16 | 2023-09-05 | Guerrilla Industries LLC | Composite structures and methods of forming composite structures |
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