JP2016175244A - 樹脂接合体、樹脂接合体の製造方法及び車両用構造体 - Google Patents
樹脂接合体、樹脂接合体の製造方法及び車両用構造体 Download PDFInfo
- Publication number
- JP2016175244A JP2016175244A JP2015056373A JP2015056373A JP2016175244A JP 2016175244 A JP2016175244 A JP 2016175244A JP 2015056373 A JP2015056373 A JP 2015056373A JP 2015056373 A JP2015056373 A JP 2015056373A JP 2016175244 A JP2016175244 A JP 2016175244A
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- Prior art keywords
- resin
- thermoplastic resin
- joined body
- welding
- thermosetting resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B29C65/022—Particular heating or welding methods not otherwise provided for
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- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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Abstract
【解決手段】繊維を含む熱可塑性樹脂と、前記熱可塑性樹脂の融解温度よりも低い融解温度を有し繊維を含む熱硬化性樹脂硬化物と、が溶着により接合した樹脂接合体及び前記樹脂接合体を有する車両用構造体並びに繊維を含む熱可塑性樹脂と、前記熱可塑性樹脂の融解温度よりも低い融解温度を有し繊維を含む熱硬化性樹脂硬化物と、を溶着して接合する接合工程を含む樹脂接合体の製造方法。
【選択図】なし
Description
<1> 繊維を含む熱可塑性樹脂と、前記熱可塑性樹脂の融解温度よりも低い融解温度を有し繊維を含む熱硬化性樹脂硬化物と、が溶着により接合した樹脂接合体。
<2> 前記熱硬化性樹脂硬化物に含まれる繊維が、織布である<1>に記載の樹脂接合体。
<3> 前記熱可塑性樹脂に含まれる繊維が、不織布である<1>又は<2>に記載の樹脂接合体。
<4> 前記熱可塑性樹脂の融解温度と前記熱硬化性樹脂硬化物の融解温度との差が50℃以上である<1>〜<3>のいずれか1項に記載の樹脂接合体。
<5> 繊維を含む熱可塑性樹脂と、前記熱可塑性樹脂の融解温度よりも低い融解温度を有し繊維を含む熱硬化性樹脂硬化物と、を溶着して接合する接合工程を含む樹脂接合体の製造方法。
<6> 前記接合工程における溶着が、振動溶着である<5>に記載の樹脂接合体の製造方法。
<7> <1>〜<4>のいずれか1項に記載の樹脂接合体を有する車両用構造体。
本実施形態に係る樹脂接合体は、繊維を含む熱可塑性樹脂と、前記熱可塑性樹脂の融解温度よりも低い融解温度を有し繊維を含む熱硬化性樹脂硬化物と、が溶着により接合したものである。本実施形態に係る樹脂接合体は、繊維を含む熱可塑性樹脂と繊維を含む熱硬化性樹脂硬化物とが接着剤又はリベット等の締結部材を用いることなく溶着により接合されているため、繊維を含む熱可塑性樹脂と繊維を含む熱硬化性樹脂硬化物を接合する際の接着剤又はリベット等の締結部材の使用による質量増加が抑制される。さらに、接着剤の強度で接合部の強度が決定されることがなく、適切な樹脂を選択することにより樹脂接合体の接合強度を向上させることができる。また、リサイクル性、ハイサイクル性に優れる熱可塑性樹脂の採用可能範囲を拡大することが可能となる。
熱硬化性樹脂と繊維とを複合化させる方法についても、特に限定されるものではなく、目的に応じて公知の各種方法を使用可能である。熱硬化性樹脂と繊維とを複合化させてプリプレグを形成してもよい。
図2は、図1の記号Aを付された楕円で囲まれた付近の拡大写真である。図2の溶着面において、熱可塑性樹脂(図2中「熱可塑」と表記されたもの)に含まれる不織布と熱硬化性樹脂硬化物(図2中「熱硬化」と表記されたもの)に含まれる織布とが絡み合った部分(繊維絡み部)が存在することがわかる。
本実施形態に係る車両用構造体は、上述した本実施形態に係る樹脂接合体を有するものである。本実施形態に係る車両用構造体の種類は特に限定されるものではなく、例えば、サイドドア、フード、ルーフ、バックドア、ラゲージドア、バンパ及びクラッシュボックスが挙げられる。
炭素繊維強化熱可塑性樹脂(CFRTP、ポリアミド樹脂と炭素繊維(不織布)との複合材料、融解温度240℃)、炭素繊維強化熱硬化性樹脂硬化物(CFRP、エポキシ樹脂硬化物と炭素繊維(織布)との複合材料、融解温度140℃)、アルミニウム板(表面未処理)、アルミニウム板(#60サンディング)及び鉄板(表面カチオン電着塗装処理)を試験片として用いた。なお、CFRPについては、樹脂を熱硬化した際のプリプレグによる型面側とフィルム面側とを区別して使用した。
試験片の大きさは、長さ175mm、幅25mm、厚み3mmとした。
試験片は、研削盤を用いて前記サイズにカットして準備した。CFRPの型面側及びフィルム面側表面、アルミニウム板の表面並びにCFRTPの表面は脱脂処理した。
試験片を25±2℃に管理された部屋で10日以上保管後、溶着試験に供した。
振動溶着機として、ブランソン MICRO PPL(日本エマソン株式会社)を用いた。ワーク(固定側)及びワーク(加振側)に表1に示す組合せで上記試験片を装着し、振動溶着を実施し、樹脂接合体を作製した。溶着条件としては、振動振幅を1.8mmとし、加圧を0.75MPaとし、溶け込み寸法を0.3mmとした。
株式会社島津製作所製 オートグラフ AG−X100KNを用い、せん断試験を実施した。得られた結果を表1に示す。なお、得られた結果は、2回の試験を行った結果の平均値である。
CFRTPとCFRPとの間で形成された接合の破断面を観察すると、CFRTP側にCFRP側の炭素繊維が付着していた。このことから、振動発熱時にCFRPのエポキシ樹脂硬化物が破壊され、エポキシ樹脂硬化物が取り除かれた箇所に熱可塑性樹脂が流れ込み、CFRP側の炭素繊維とCFRTPとが接合したものと考えられる。
なお、CFRPの型面とフィルム面とでせん断強度に差が生じた。型面とフィルム面との表面凹凸の差は10μm程度しかないため、今回の評価においては表面凹凸によるせん断強度への影響は少ないと考えられる。しかし、型面とフィルム面とでは使用されている離型剤の種類が異なるため、フィルム面に離型剤が多く残留(溶着前に脱脂済み)していることによる影響が強いと考えられる。そのため、フィルム面側では、せん断強度のばらつき(17.3MPa及び14.0MPa)が大きくなったと考えられる。
一方、アルミニウム板及び鉄板を試験片として用いた場合、接合効果がほとんど見られなかった。これは、振動溶着の原理より、試験片の接触面同士の摩擦により生ずる熱により試験片が溶着するため、金属表面に凹凸を設けても凹凸がすりつぶされるため接触面に樹脂等をコーティングしない限りは金属と熱可塑性樹脂との接合は困難と考えられる。また、表面カチオン電着塗装処理など極めて樹脂の膜厚が薄い場合には、振動溶着によりこの樹脂が剥がし取られる可能性が高いため、せん断強度を得るには金属表面にある程度の樹脂厚みが必要と考えられる。
超音波溶着機として、ブランソン 2000Xdt(日本エマソン株式会社)を用いた。超音波溶着機による溶着条件を表2に示すように設定し、超音波溶着試験を実施し、樹脂接合体を作製した。また、超音波溶着された試験片のせん断強度の測定を、振動溶着による試験の場合と同様にして実施した。得られた結果を表2に示す。試験片としては、CFRTP及びCFRPを使用した。
また、振幅を約3μm(制御上は約5%)増減することで溶着強度に大きな変化(相異)が発生した。
Claims (7)
- 繊維を含む熱可塑性樹脂と、前記熱可塑性樹脂の融解温度よりも低い融解温度を有し繊維を含む熱硬化性樹脂硬化物と、が溶着により接合した樹脂接合体。
- 前記熱硬化性樹脂硬化物に含まれる繊維が、織布である請求項1に記載の樹脂接合体。
- 前記熱可塑性樹脂に含まれる繊維が、不織布である請求項1又は請求項2に記載の樹脂接合体。
- 前記熱可塑性樹脂の融解温度と前記熱硬化性樹脂硬化物の融解温度との差が50℃以上である請求項1〜請求項3のいずれか1項に記載の樹脂接合体。
- 繊維を含む熱可塑性樹脂と、前記熱可塑性樹脂の融解温度よりも低い融解温度を有し繊維を含む熱硬化性樹脂硬化物と、を溶着して接合する接合工程を含む樹脂接合体の製造方法。
- 前記接合工程における溶着が、振動溶着である請求項5に記載の樹脂接合体の製造方法。
- 請求項1〜請求項4のいずれか1項に記載の樹脂接合体を有する車両用構造体。
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