JP7161604B2 - 繊維強化樹脂物品の製造方法 - Google Patents
繊維強化樹脂物品の製造方法 Download PDFInfo
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- JP7161604B2 JP7161604B2 JP2021507167A JP2021507167A JP7161604B2 JP 7161604 B2 JP7161604 B2 JP 7161604B2 JP 2021507167 A JP2021507167 A JP 2021507167A JP 2021507167 A JP2021507167 A JP 2021507167A JP 7161604 B2 JP7161604 B2 JP 7161604B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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Description
前記一方向性繊維強化樹脂シート(UDS)100質量部に対する前記チョップドシート(CS)の割合が、40質量部以上100質量部以下である繊維強化樹脂物品。
前記配置する工程で得られた配置後の物品を加熱及び加圧する工程とを有する繊維強化樹脂物品の製造方法。
前記繊維強化樹脂物品の前記発泡体層側の面とは対向する面が前記チョップドシート(CS)を複数含む[10]に記載の積層体。
[10]に記載の積層体。
前記発泡体層の他方の面上に、一方向性繊維強化樹脂シート(UDS)が位置し、
前記繊維強化樹脂物品の前記発泡体層側の面とは対向する面が前記チョップドシート(CS)を複数含む[10]に記載の積層体。
各々の前記繊維強化樹脂物品の前記発泡体層側の面とは対向する面が前記チョップドシート(CS)を複数含む請求項10に記載の積層体。
図1は、本発明の繊維強化樹脂物品の一実施形態を示す模式的平面図である。本発明の繊維強化樹脂物品は、図1に示すように、一方向性繊維強化樹脂シート(UDS)1の少なくとも一方の面(シート面)に、一方向性繊維強化樹脂シートのチョップドシート(CS)2を複数含む物品である。
以上説明した本発明の繊維強化樹脂物品は、その製造方法について特に制限されない。ただし、本発明の繊維強化樹脂物品の製造方法は、一方向性繊維強化樹脂シート(UDS)の少なくとも一方の面に、この一方向性繊維強化樹脂シート(UDS)と同一又は異なる一方向性繊維強化樹脂シートのチョップドシート(CS)を複数配置する工程と、この配置する工程で得られた配置後の物品を加熱及び加圧する工程とを有する繊維強化樹脂物品の製造方法である。
本発明に用いる一方向性繊維強化樹脂シート(UDS)及びチョップドシート(CS)を構成する繊維強化樹脂組成物の種類は特に限定されない。その具体例を以下に説明する。
以上説明した本発明の繊維強化樹脂物品は、他の物品に積層して積層体として使用することも好ましい。積層体の種類は特に限定されず、具体的には、先に述べたような発泡シート又はハニカム板の片面、あるいは両面に本発明の繊維強化樹脂物品を積層したサンドウィッチパネルであっても良いし、またそれ以外の種類の積層体であっても良い。
島津製作所製引張試験機AG-X 100kNを使用し、引張速度0.45mm/分、23℃にて測定を行った。試験片の厚み以外はJIS K7164に準拠した条件で引張試験を行ない、ヤング率と引張強度を測定した。
ミツトヨ社製デジマチック標準外側マイクロメータMDE-MXを使用し、サンプルの1辺あたり3点、合計8点(隣合う2辺では1点を共有)測定し、平均値を厚みとした。
サンプルのシートを50mm×50mmの正方形に切り出し、質量Wc(g)を測定した。この切り出したサンプルを480℃で1時間加熱し、樹脂を熱劣化させ取り除き、炭素繊維のみの質量Wf(g)を測定し、次の式によって繊維堆積分率Vfを求めた。
繊維体積分率Vf=(Wf/Wc)×ρc/ρf
ここで、ρcはサンプルの密度(g/cm3)、ρfはサンプルに用いられている炭素繊維の密度(g/cm3)である。
(一方向性繊維強化樹脂シート(UDS)の作製)
国際公開第2016/114352号の実施例6に記載された方法で一方向性繊維強化樹脂シート(但し、厚みは162.4μm、繊維体積分率Vfは0.53)を作製し、これを切り出すことによって、200mm×200mmの一方向性繊維強化樹脂シート(UDS)を得た。この一方向性繊維強化樹脂シート(UDS)の質量は8.98gであった。
以上のようにして作製した一方向性繊維強化樹脂シート(UDS)と同じものである一方向性繊維強化樹脂シートを、12.5mm幅でスリットしてテープ状とし、これをさらに約15mmの長さで切断して多数のチョップドシート(CS)を得た。
以上の様にして作製した多数のチョップドシート(CS)4.49gを、一方向性繊維強化樹脂シート(UDS)の上に、できるだけ重ならないようにランダムに配置した(一方向性繊維強化樹脂シート(UDS)100質量部に対するチョップドシート(CS)の割合=50質量部、チョップドシート(CS)の単位面積当たりの個数=約3200個/m2)。次いで、この一方向性繊維強化樹脂シート(UDS)の上に多数のチョップドシート(CS)が配置された物品を、2枚のステンレス板の間に挟み、185℃に加熱したプレス装置(東洋精機製作所製、ミニテストプレスMP-WCH)を用いて2MPaの圧力を3分間かけた。その後、15℃に調節したプレス装置に移動させて30秒間2MPa、さらに30秒間4MPaの圧力をかけて冷却を行った。このようなプレス成形により、厚み255μmの平滑な繊維強化樹脂物品を得た。繊維強化樹脂物品の総質量は13.47gであり、一方向性繊維強化樹脂シート(UDS)の質量に対する繊維強化樹脂物品の総質量の比率(以下「質量比」と称す)は1.5であった。
一方向性繊維強化樹脂シート(UDS)の上に配置するチョップドシート(CS)の質量を5.39gに変更したことと以外は、実施例1と同様にして平滑な繊維強化樹脂物品を作製し、引張試験を行なった(一方向性繊維強化樹脂シート(UDS)100質量部に対するチョップドシート(CS)の割合=60質量部、チョップドシート(CS)の単位面積当たりの個数=約3840個/m2)。繊維強化樹脂物品の厚みは251μm、総質量は14.37gであり、質量比は1.6であった。繊維強化樹脂物品の0°方向のヤング率は69.64GPa、引張強度は609MPa、45°方向のヤング率は6.53GPa、引張強度は13.1MPa、90°方向のヤング率は5.42GPa、引張強度は7.9MPaであった。また、繊維強化樹脂物品のチョップドシート(CS)側の外観は大理石調であった。
一方向性繊維強化樹脂シート(UDS)の上に配置するチョップドシート(CS)の質量を8.08gに変更したこと以外は、実施例1と同様にして平滑な繊維強化樹脂物品を作製し、引張試験を行なった(一方向性繊維強化樹脂シート(UDS)100質量部に対するチョップドシート(CS)の割合=90質量部、チョップドシート(CS)の単位面積当たりの個数=約5760個/m2)。繊維強化樹脂物品の厚みは313μm、総質量は17.06gであり、質量比は1.9であった。繊維強化樹脂物品の0°方向のヤング率は64.94GPa、引張強度は588MPa、45°方向のヤング率は22.7GPa、引張強度は24.3MPa、90°方向のヤング率は4.72GPa、引張強度は11.3MPaであった。また、繊維強化樹脂物品のチョップドシート(CS)側の外観は大理石調であった。
実施例1で作製したものと同じ一方向性繊維強化樹脂シート(UDS)2枚を0°方向に積層し、実施例1と同じ条件でプレス成形を行ない、厚み323μmの平滑な繊維強化樹脂物品を得た。繊維強化樹脂物品の総質量は17.96gであり、質量比は2.0であった。なお、比較例1における質量比は、下地となる一方向性繊維強化樹脂シート(UDS)の質量に対する繊維強化樹脂物品の総質量の比率である。実施例1と同じ引張試験を行なったところ、0°方向のヤング率は105.42GPa、引張強度は1499MPa、45°方向のヤング率は5.03GPa、引張強度は9.3MPa、90°方向のヤング率は3.43GPa、引張強度は5.6MPaであり、実施例1の繊維強化樹脂物品と比較して45°方向及び90°方向の強度が低かった。また、この比較例1のような一方向性の繊維強化樹脂物品は、プレス成形により3次元形状を付与する場合は割れが発生する可能性が高い。
実施例1で作製したものと同じ一方向性繊維強化樹脂シート(UDS)1枚を0°方向、他の1枚を90°方向にして積層し、実施例1と同じ条件でプレス成形を行なって、厚み314μmの繊維強化樹脂物品を得た。繊維強化樹脂物品の総質量は17.96g、質量比は2.0であった。なお、比較例2における質量比は、下地となる一方向性繊維強化樹脂シート(UDS)の質量に対する繊維強化樹脂物品の総質量の比率である。得られた繊維強化樹脂物品は、0°方向と90°方向の収縮率の違いによって大きくカールしてしまった。実施例1と同じ引張試験を行なったところ、0°方向(下側の一方向性繊維強化樹脂シート(UDS)の繊維方向に対し平行な方向)のヤング率は57.84GPa、引張強度は699MPa、45°方向のヤング率は4.92GPa、引張強度は36.5MPa、90°方向(下側の一方向性繊維強化樹脂シート(UDS)の繊維方向に対し直角な方向)のヤング率は50.0GPa、引張強度は604MPaであった。また、この比較例2のような二方向性(0°及びと90°方向)の繊維強化樹脂物品は形状追従性が劣り、プレス成形により3次元形状を付与する場合は割れやしわが発生する可能性がある。
一方向性繊維強化樹脂シート(UDS)の上に配置するチョップドシート(CS)の質量を2.70gに変更したこと以外は、実施例1と同様にして繊維強化樹脂物品を作製し、引張試験を行なった(一方向性繊維強化樹脂シート(UDS)100質量部に対するチョップドシート(CS)の割合=30質量部、チョップドシート(CS)の単位面積当たりの個数=約1920個/m2)。繊維強化樹脂物品の厚みは210μm、総質量は11.67gであり、質量比は1.3であった。繊維強化樹脂物品の0°方向のヤング率は58.50GPa、引張強度は516MPa、45°方向のヤング率は4.70GPa、引張強度は8.2MPa、90°方向のヤング率は2.78GPa、引張強度は4.5MPaであり、実施例に比べて劣っていた。また、繊維強化樹脂物品のチョップドシート(CS)側の外観は隙間が大きく、まだら状態で大理石調とは言えないものであった。図3は、その外観の一部を斜め方向から撮影した写真である。
実施例1で作製したものと同じ多数のチョップドシート(CS)17.96gを、ステンレス板の上に、200mm×200mmのサイズで、できるだけ2層を超える重なりができないようにランダムに配置し、実施例1と同じ条件でプレス成形を行なって、厚み321μmの繊維強化樹脂物品(ランダムシート)を得た。しかし、繊維強化樹脂物品のところどころに穴が生じ、均一なシートは得られなかった。図4は、その外観の一部を斜め方向から撮影した写真である。
(繊維強化樹脂物品の作製)
実施例1と同じ厚み255μmの繊維強化樹脂物品を2枚作製した。
厚み5mmのポリプロピレン製発泡シート(三井化学東セロ株式会社製、商品名パロニア、密度=0.3g/cc、発泡倍率=3倍)を、200mm×200mmの形状に切り出した。そして、繊維強化樹脂物品/発泡シート/繊維強化樹脂物品の順で積層した。この積層工程においては、各々の繊維強化樹脂物品の発泡体シートに接する面(内側面)は一方向性繊維強化樹脂シート(UDS)の面とし、その面とは対向する面(外側面)はチョップドシート(CS)側の面とした。また、各々の繊維強化樹脂物品の一方向性繊維強化樹脂シート(UDS)の繊維方向は、同じ方向(0°方向)にした。
2 チョップドシート(CS)
Claims (5)
- 一方向性繊維強化樹脂シート(UDS)の少なくとも一方の面に、この一方向性繊維強化樹脂シート(UDS)と同一又は異なる一方向性繊維強化樹脂シートの小片であるチョップドシート(CS)を複数分散配置する工程と、
前記配置する工程で得られた配置後の物品を加熱及び加圧する工程とを有する繊維強化樹脂物品の製造方法。 - 前記一方向性繊維強化樹脂シート(UDS)及び前記チョップドシート(CS)がいずれも、熱可塑性樹脂を含む、請求項1に記載の繊維強化樹脂物品の製造方法。
- 前記熱可塑性樹脂がいずれも、ポリプロピレン系樹脂およびポリアミド系樹脂からなる群から選択される少なくとも一種の熱可塑性樹脂である請求項2に記載の繊維強化樹脂物品の製造方法。
- 前記一方向性繊維強化樹脂シート(UDS)と前記チョップドシート(CS)が、同じ種類の樹脂を含む請求項1に記載の繊維強化樹脂物品の製造方法。
- 前記一方向性繊維強化樹脂シート(UDS)及び前記チョップドシート(CS)がいずれも、炭素繊維およびガラス繊維からなる群から選択される少なくとも一種の繊維を含む請求項1に記載の繊維強化樹脂物品の製造方法。
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US11951724B2 (en) | 2024-04-09 |
EP3943267A1 (en) | 2022-01-26 |
JPWO2020189268A1 (ja) | 2021-12-23 |
WO2020189268A1 (ja) | 2020-09-24 |
JP2022173292A (ja) | 2022-11-18 |
JP7425844B2 (ja) | 2024-01-31 |
EP3943267A4 (en) | 2022-11-16 |
CN113573864A (zh) | 2021-10-29 |
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US20220168989A1 (en) | 2022-06-02 |
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