JP7447791B2 - 切込プリプレグおよび繊維強化プラスチック - Google Patents
切込プリプレグおよび繊維強化プラスチック Download PDFInfo
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Description
-1.0<L1/L2<0.5
である切込プリプレグである。
繊維体積含有率(%)={(強化繊維の重量含有率)/(強化繊維の密度)}/{(強化繊維の重量含有率)/(強化繊維の密度)+(マトリックス樹脂の重量含有率)/(マトリックス樹脂の密度)}×100
本発明の切込プリプレグは、切込領域において、繊維方向の投影長が略同一の複数の切込が繊維方向に略一定間隔で配置された切込列が、複数列形成されている。そして、当該切込列のうち任意の一の切込列の両側に存在する2列の切込列の繊維直交方向の間隔をL1、当該一の切込列の繊維方向の投影長をL2、とした場合に、
-1.0<L1/L2<0.5
を満たす。以下、このような切込の配置パターンを、「本発明の切込パターン」と記す場合がある。
作製した切込プリプレグを繊維直交方向25mm×繊維方向150mmのサイズに切り出し、島津万能試験機((株)島津製作所製)の恒温槽内にセットし、温度100℃、引張速度100mm/分の条件で繊維方向に引っ張った。
変形抵抗応力比1=(連続繊維プリプレグPに切込パターンを挿入した切込プリプレグの変形抵抗応力)/(連続繊維プリプレグQに切込パターンを挿入した切込プリプレグの変形抵抗応力)。
変形抵抗応力比2=(連続繊維プリプレグPに切込パターンを挿入した切込プリプレグの変形抵抗応力)/(連続繊維プリプレグRに切込パターンを挿入した切込プリプレグの変形抵抗応力)。
エポキシ樹脂(ジャパンエポキシレジン(株)製“jER(登録商標)”828:35重量部、“jER(登録商標)”1001:30重量部、“jER(登録商標)”154:35重量部)に、熱可塑性樹脂ポリビニルホルマール(チッソ(株)製“ビニレック(登録商標)”K)5重量部をニーダーで加熱混練してポリビニルホルマールを均一に溶解させた後、硬化剤ジシアンジアミド(ジャパンエポキシレジン(株)製DICY7)3.5重量部と、硬化促進剤3-(3,4-ジクロロフェニル)-1,1-ジメチルウレア(保土谷化学工業(株)製DCMU99)4重量部を、ニーダーで混練して未硬化のエポキシ樹脂組成物を調整した。このエポキシ樹脂組成物を、リバースロールコーターを用いて、シリコーンコーティング処理させた離型紙上に塗布して目付50g/m2または25g/m2の樹脂フィルムを作製した。
連続繊維プリプレグP、および連続繊維プリプレグQを、図7に示す切込パターンになるよう、全ての切込の切込長を3mm、切込角度θの絶対値を20°、L1/L2=0.2、切込のピッチL3=60mmとして切込を挿入した。切込はローターカッターを用いてプリプレグ全体にわたって挿入することで作製した。
L1/L2=0とした以外は実施例1と同様にして、切込プリプレグを作製した。
L1/L2=-0.2とした以外は実施例1と同様にして、切込プリプレグを作製した。
連続繊維プリプレグP、および連続繊維プリプレグRを、図7に示す切込パターンになるよう、全ての切込長を3mm、切込角度の絶対値を20°、L1/L2=0.2、切込のピッチL3=60mmとして切込を挿入した。切込はロータリーカッターを用いてプリプレグ全体にわたって挿入することで作製した。
L1/L2=0としたこと以外は実施例4と同様にして、切込プリプレグを作製した。
L1/L2=-0.2としたこと以外は実施例4と同様にして、切込プリプレグを作製した。
L1/L2=1.0とし、さらに平均繊維長を実施例1~3に近づける目的で切込のピッチを30mmとした以外は実施例1と同様にして、切込プリプレグを作製した。
L1/L2=1.2とした以外は比較例1と同様にして、切込プリプレグを作製した。賦形性評価を実施したところ、連続繊維の存在により、応力ひずみ線図の応力値がある一定値となる挙動を示さず、変形抵抗応力を取得できないほど、非常に高い応力が発生した。
L1/L2=1.0とし、さらに平均繊維長を実施例4~6に近づける目的で切込のピッチを30mmとした以外は実施例4と同様にして、切込プリプレグを作製した。
2: 強化繊維
3: 切込
31:正の切込角度の切込
32:負の切込角度の切込
4: 切込領域
51:切込A1
52:切込A2
6: 切込B
7: 切込C
8: 変形抵抗応力
Claims (10)
- 一方向に配向した強化繊維と、マトリックス樹脂とを含むとともに、前記強化繊維を分断する複数の切込が形成されてなる切込領域を有する切込プリプレグであって、
前記切込領域において、繊維方向の投影長が略同一の複数の切込が繊維方向に略一定間隔で配置された切込列が、複数列形成され、
任意の一の切込列の両側の最も隣に存在する2列の切込列の、繊維直交方向の間隔をL1、
前記一の切込列の繊維方向の投影長をL2、
とした場合に、
-1.0<L1/L2<0.5
であり、
前記一の切込列とその両側の最も隣に存在する切込列とで、繊維方向に対する切込角度の正負が異なる、
切込プリプレグ。 - -1.0<L1/L2≦0である、請求項1に記載の切込プリプレグ。
- L1/L2=0である、請求項2に記載の切込プリプレグ。
- -1.0<L1/L2<0である、請求項2に記載の切込プリプレグ。
- 前記一の切込列とその両側に存在する切込列とで、繊維方向に対する切込角度の絶対値が同一である、請求項1~4のいずれかに記載の切込プリプレグ。
- 前記切込列を構成する切込のピッチが20mm以上である、請求項1~5のいずれかに記載の切込プリプレグ。
- 前記強化繊維の前記切込領域内の平均繊維長が10~100mmである、請求項1~6のいずれかに記載の切込プリプレグ。
- 繊維体積含有率が50%以上である、請求項1~7のいずれかに記載の切込プリプレグ。
- 請求項1~8のいずれかに記載の切込プリプレグが成形されてなる繊維強化プラスチック。
- 前記切込領域が三次元形状に成形されてなる、請求項9に記載の繊維強化プラスチック。
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