THERMOPLASTIC PREPREG, FIBER-REINFORCED PLASTIC, AND MANUFACTURING METHOD THEREFOR

• Main Authors: HONMA, Masato, MATSUTANI, Hiroaki, ADACHI, Kentaro, KAWAHARA, Kota, TSUDA, Terumasa
• Format: Patent
• Language: English; French; Japanese
• Published: 10.03.2022
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; MAKING GRANULES OR PREFORMS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

The present invention addresses the problem of providing a fiber-reinforced plastic capable of conforming to shapes of higher complexity while remaining light in weight and maintaining mechanical characteristics.　Provided is a thermoplastic prepreg that is formed by impregnating a thermoplastic resin into a discontinuous reinforcing-fiber web and satisfies at least one of the following features (A) and (B). Feature (A): Has a plurality of cut marks that cut at least some of the discontinuous reinforcing fibers constituting the discontinuous reinforcing-fiber web. Feature (B): Has a region of variable fiber lengths in which the coefficient of variation of the fiber lengths of the discontinuous reinforcing fibers constituting the discontinuous reinforcing-fiber web is 40% or more. La présente invention vise à fournir une matière plastique renforcée par des fibres capable de se conformer à des formes d'une complexité supérieure tout en restant légère et en conservant des caractéristiques mécaniques.　L'invention concerne un préimprégné thermoplastique qui est formé par imprégnation d'une résine thermoplastique dans une bande de fibres de renforcement discontinue et satisfait au moins l'une des caractéristiques (A) et (B) suivantes. Caractéristique (A) : présente une pluralité de marques de coupe qui coupent au moins certaines des fibres de renforcement discontinues constituant la bande de fibres de renforcement discontinue. Caractéristique (B) : présente une région de longueurs de fibres variables dans laquelle le coefficient de variation des longueurs de fibres des fibres de renforcement discontinues constituant la bande de fibres de renforcement discontinue est de 40 % ou plus. 軽量性および力学特性を保ちながらも、より複雑形状に対応し得る繊維強化プラスチックを提供することを課題とする。　不連続強化繊維ウェブに熱可塑性樹脂が含浸されてなる熱可塑性プリプレグであって、以下の特徴（Ａ）または特徴（Ｂ）の少なくとも一方を満たす、熱可塑性プリプレグ。 特徴（Ａ）：前記不連続強化繊維ウェブを構成する不連続強化繊維の少なくとも一部を切断する複数の切込を有する。 特徴（Ｂ）：前記不連続強化繊維ウェブを構成する不連続強化繊維の繊維長の変動係数が４０％以上である繊維長変動領域を有する。