재활용 탄소섬유/폴리아마이드 기반 열가소성 중간재의 연속압축성형 공정 최적화 연구 = Optimization of Continuous Compression Molding Process for Thermoplastic Intermediates Based on Recycled Carbon Fiber and Polyamide

다국어 초록 (Multilingual Abstract)

This study aims to optimize the Continuous Compression Molding (CCM) process for the fabrication of recycled carbon fiber (rCF) reinforced polyamide 6 (PA6) thermoplastic composite intermediates. The research focuses on clarifying the effects of key CCM process parameters—such as temperature, pressure, feed speed, and mold control conditions—on impregnation behavior, void formation, and mechanical properties of rCF/PA6 composite sheets. Systematic experiments were conducted to evaluate first-step and second-step impregnation processes. The results show that insufficient residence time during the initial impregnation stage leads to significant void formation, particularly in the mid-thickness region. In contrast, optimized processing conditions combined with a two-step impregnation approach promote resin reflow and improved compaction, resulting in a substantial reduction in void content.
Under optimized CCM conditions, the void content of rCF/PA6 composites was reduced to below 5%, accompanied by a noticeable improvement in tensile strength. These findings demonstrate that precise control of CCM process parameters and the application of a two-step impregnation strategy are essential for achieving uniform impregnation and reliable mechanical performance, supporting the feasibility of rCF/PA6 composites for structural and automotive applications.

목차 (Table of Contents)

• Ⅰ. 서론 1
• 1.1 연구 배경 1
• 1.2 연구 목적 2
• Ⅱ. 이론적 배경 3
• 2.1 복합재료의 개요 3
• 2.2 탄소섬유 및 재활용 탄소섬유(rCF)의 특성 4
• 2.3 폴리아마이드6(PA6)의 특성 5
• 2.4 열가소성 복합재의 특성 6
• 2.5 연속압축성형(CCM) 공정의 원리 6
• 2.6 선행연구 및 기술동향 8
• Ⅲ. 실험 재료 및 방법 9
• 3.1 실험 개요 9
• 3.2 실험 재료 10
• 3.3 실험 장비 및 공정 조건 14
• 3.4 시편 제조 및 2단계 함침 공정 22
• 3.5 시험 방법 31
• Ⅳ. 결과 및 고찰 35
• 4.1 1차 함침(1T) rCF/PA6 시편의 미세구조 및 기계적 성능 35
• 4.2 2차 함침(2t)에 따른 Void 저감 및 미세구조 개선 38
• 4.3 2단계 함침에 따른 기계적 물성 향상 45
• Ⅴ. 결론 53
• 참 고 문 헌 55
• Abstract 56