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pp.41-49
The engineered materials arresting system (EMAS) is a safety facility installed at the end of runways to safely stop aircraft when runway overruns occur. The EMAS comprises porous panels composed of specialized materials; however, direct exposure to environmental factors, such as moisture infiltration, freeze–thaw cycles, and ultraviolet radiation, may cause performance degradation. In regions with four distinct seasons and significant temperature variations, such as South Korea, changes in the physical properties and durability of porous panels can pose significant challenges. Therefore, a protective top coating must be applied to EMAS panels to protect the panels from environmental stress and ensure long-term durability. This study presents a preliminary investigation into the development of a high-performance polyureabased top coating to effectively protect the components of an EMAS and crushable concrete panels as well as to maintain the system’s long-term durability and arresting performance. First, optimal formulations were determined via a design study, where the index ratio (the equivalent ratio of polyurea resin to the curing agent) and the NCO content of the isocyanate component were varied. Second, the curing behavior, mechanical properties, and temperature dependence were evaluated. Polyurea—a high-performance elastomer formed by the reaction between isocyanate and amine-based curing agents—exhibits rapid reactivity, complete waterproofing, excellent flexibility, and elasticity, thus satisfying the essential requirements of EMAS top coatings. Considering the balance between stiffness and flexibility, an index ratio of 1.05 and an NCO content of 16.0% were identified as the optimal mix design. Mechanical testing demonstrated a high tensile strength of 20.0 MPa, an outstanding elongation at break of 388%, and a tear strength of 100 N/mm, thus indicating sufficient durability and flexibility to withstand aircraft jet blast and temperature fluctuations. Temperature-dependence tests confirmed that the elongation remained at 136% (at -20 °C) and the tensile-strength ratio at 68% (at 60 °C), thus demonstrating that the coating can maintain stable performance in environments with significant seasonal temperature variations.
1. 서론
1.1. 연구 배경 및 필요성
1.2. 연구 목적 및 범위
2. 기술개발 현황
2.1. 국외 관련 기술 현황
2.2. 국내 관련 기술 현황
2.3. 관련 주요 특허 분석
3. 폴리우레아계 폴리머 재료
4. 최적 배합 도출
4.1. Index Ratio에 따른 물성 평가
4.2. NCO 함량 변화에 따른 물성 평가
5. 기초 성능 평가
5.1. 경화 특성 시험
5.2. 기계적 물성 시험
5.3. 온도 의존성
6. 결론
감사의 글
REFERENCES
