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Separation mechanism of resin from CFRP laminates by bipolar electrical treatment using electrical impedance method

Research Project

Project/Area Number 22K04714
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 26030:Composite materials and interfaces-related
Research InstitutionKagawa University

Principal Investigator

Matsuda Shinya  香川大学, 創造工学部, 准教授 (10550460)

Co-Investigator(Kenkyū-buntansha) 大島 一真  九州大学, 工学研究院, 助教 (60734275)
Project Period (FY) 2022-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2024: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
KeywordsCFRP / 電気処理 / バイポーラ / 繊維配向 / 電位勾配 / 電気インピーダンス / パーコレーション / 繊維の織り方 / 熱可塑性樹脂 / ジュール熱 / 繊維方向 / 分離率 / 電気分解 / インピーダンス
Outline of Research at the Start

炭素繊維強化プラスチック(CFRP)のリサイクル手法として熱分解による炭素繊維(CF)回収が主流である.しかし切断破砕した後に熱分解されるため,回収されるCFは短繊維となり,用途が限定される.それに対して,電気処理法はCFの熱損傷を抑制して樹脂を分離できるため,長繊維のCF回収が期待できる.しかしCFと樹脂の分離現象は,科学的かつ定量的に明らかにされていないため,電気処理の優位点が示されていない.本研究では,「どのようにCFと樹脂は分離されるのか?」の命題に対して,バイポーラ電解槽による分離メカニズムを電気インピーダンスモニタリングを併用して実験的および理論的な観点から体系的に解明する.

Outline of Final Research Achievements

This study aimed to clarify the resin separation mechanism of CFRP by a bipolar electrical treatment in a neutral electrolyte with aid of non-destructive monitoring applying electrical impedance in order to demonstrate the advantages of the recycling method. As a result, it was revealed that the resin separation generates on the "positively" charged side of the CFRP i.e., the oxygen gas generating side. Furthermore, non-destructive monitoring showed that the change of impedance value over time was consistent with the change of resin separation ratio. This is because capacitance increases with resin separation, while the electrical resistance changes owing to a change in the percolation state of the CFRP and the penetration of the electrolyte during the treatment.

Academic Significance and Societal Importance of the Research Achievements

本研究は、電気処理による炭素繊維(CF)回収手法の停滞をブレークスルーするために,「どのようにCFと樹脂は分離されるのか?」の命題に対して,バイポーラ電解槽による分離メカニズムを電気インピーダンスによるモニタリングを併用して体系的に解明してきた.本研究により得られた成果は,これから大量に破棄されるCFRPからのCFリサイクルプロセスの効率化の手法として電気処理法の活用が期待できるため,循環型社会の実現に資し,新たな選択肢を提供する点で社会的意義は大きい.

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • Research Products

    (18 results)

All 2025 2024 2023 2022

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (14 results) (of which Int'l Joint Research: 4 results,  Invited: 2 results)

  • [Journal Article] Effects of constituent materials on resin separation from CFRP by electrical treatment2025

    • Author(s)
      Matsuda Shinya、Yoshikawa Yuki、Oshima Kazumasa
    • Journal Title

      Materials Letters

      Volume: 381 Pages: 137786-137786

    • DOI

      10.1016/j.matlet.2024.137786

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Recycling of wet carbon fiber-reinforced plastic laminates by thermal decomposition coupled with electrical treatment2024

    • Author(s)
      Matsuda Shinya、Koyano Saki、Oshima Kazumasa
    • Journal Title

      Composites Part A: Applied Science and Manufacturing

      Volume: 178 Pages: 107991-107991

    • DOI

      10.1016/j.compositesa.2023.107991

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] Tensile fracture characteristics of carbon fibers collected from the outer and inner parts of a CFRP laminate by thermal decomposition2022

    • Author(s)
      Matsuda Shinya、Miyake Manami、Oshima Kazumasa
    • Journal Title

      Composite Structures

      Volume: 292 Pages: 115603-115603

    • DOI

      10.1016/j.compstruct.2022.115603

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Voids formation characteristics in typical epoxy-based CFRP laminates during low-temperature annealing in the air or N<sub>2</sub> atmosphere2022

    • Author(s)
      Oshima Kazumasa、Matsuda Shinya、Hosaka Masaki、Kishida Masahiro、Satokawa Shigeo
    • Journal Title

      Advanced Composite Materials

      Volume: Published online Issue: 4 Pages: 1-13

    • DOI

      10.1080/09243046.2022.2121228

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] CFRP積層板の電気処理を利用した熱分解リサイクルにおける吸湿処理条件の影響2025

    • Author(s)
      牧浦圭紀,松田伸也,大島一真
    • Organizer
      日本機械学会 中国四国支部 第63期総会・講演会
    • Related Report
      2024 Annual Research Report
  • [Presentation] リサイクル炭素繊維束の強度信頼性解析2025

    • Author(s)
      松田伸也,草場悠河,合田公一
    • Organizer
      日本材料学会四国支部第22回学術講演会
    • Related Report
      2024 Annual Research Report
  • [Presentation] Investigation of electrical assistance for chemical dissolution method of CFRP recycling2024

    • Author(s)
      Ryohei Kobayashi, Kazumasa Oshima, Shinya Matsuda, Masahiro Kishida
    • Organizer
      International Symposium on Feedstock Recycling of Polymeric Materials (ISFR 2024)
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of electrical treatment on CFRP recycling by chemical dissolution method2024

    • Author(s)
      Ryohei Kobayashi, Kazumasa Oshima, Shinya Matsuda, Masahiro Kishida
    • Organizer
      The 8th Shanhai-Kyushu-Yeungnam (SKY) Joint Symposium
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Estimation of Stress-Strain Curves for Carbon Fiber Bundle Considering Frictional Stress by Markov Process2024

    • Author(s)
      Shinya Matsuda, Koichi Goda
    • Organizer
      7th International Conference on Materials and Reliability (ICMR2024)
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水質浄化材料応用に向けた熱劣化炭素繊維の微生物吸着特評価2024

    • Author(s)
      平野満大,小林亮太,松田伸也,坂本広太,大津直史
    • Organizer
      日本化学会北海道支部2024年夏季研究発表会
    • Related Report
      2024 Annual Research Report
  • [Presentation] 炭素繊維強化プラスチックの電気的リサイクル法における電解液の影響2024

    • Author(s)
      小林燎平,大島一真,松田伸也,岸田昌浩
    • Organizer
      化学工学会第55回秋季大会
    • Related Report
      2024 Annual Research Report
  • [Presentation] マルコフ過程による摩擦応力を考慮した炭素繊維束の応力―ひずみ曲線と強度信頼性解析2024

    • Author(s)
      松田伸也,中山有理,草場悠河,合田公一
    • Organizer
      日本材料学会第35回信頼性シンポジウム
    • Related Report
      2024 Annual Research Report
  • [Presentation] 電気処理によるCFRP積層板の樹脂分離特性2024

    • Author(s)
      高橋皓太,松田伸也,大島一真
    • Organizer
      日本機械学会 中国四国支部 第62期総会・講演会
    • Related Report
      2023 Research-status Report
  • [Presentation] Effects of fiber orientation and matrix on resin removal from carbon-fiber reinforced composites by electrical treatment2023

    • Author(s)
      Yuki Yoshikawa, Shinya Matsuda, Kazumasa Oshima
    • Organizer
      The 4th Joint Workshop of Advanced Materials Science and Engineering between Hanbat National University and Kagawa University (4th JWHK)
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] 変形・損傷・破壊の視点によるCFRPのリサイクルに関する研究2023

    • Author(s)
      松田伸也
    • Organizer
      日本材料学会中国支部材料研究交流会
    • Related Report
      2023 Research-status Report
    • Invited
  • [Presentation] 電圧印加法を用いた炭素繊維強化プラスチックの新規リサイクル法の開発2023

    • Author(s)
      大島一真,松田伸也
    • Organizer
      第12回JACI/GSCシンポジウム
    • Related Report
      2023 Research-status Report
  • [Presentation] 熱分解処理を施したCFRP積層板の内外部から回収した炭素繊維の引張破壊特性2023

    • Author(s)
      松田伸也
    • Organizer
      日本材料学会第177回破壊力学部門委員会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 電圧印加を援用した熱分解法によるCFRP積層板から回収した炭素繊維の引張強度特性2023

    • Author(s)
      松田伸也,別所京冴,岡本恭祐,大島 一真
    • Organizer
      日本材料学会第71期学術講演会
    • Related Report
      2022 Research-status Report

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Published: 2022-04-19   Modified: 2026-01-16  

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