교반기의 임펠러 형태에 따른 폴리우레탄 폼의 미세구조와 물성 연구
Study on Microstructure and Physical Properties of PUF by the Impeller Type of Agitator
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초록
폴리우레탄폼(PUF)은 연질, 반경질, 경질 형태로 제작이 가능하여 산업적으로 다양한 분야에서 활용되고 있다. 그 중에서도 경질 폴리우레탄폼은 우수한 기계적 특성과 낮은 열전도도를 가지고 있어, 건축물의 단열재와 천연가스 운수송 분야에서 보냉재로 사용되고 있다. 해당 분야에서는 기계적 강도는 높이고 열전도도는 낮추고자 하는 기술적 수요가 꾸준히 요구되고 있다. 본 연구에서는 경질 폴리우레탄폼을 제작하고, 교반기의 임펠러 형태 (Propeller, Dispersed turbine)에 따른 폼의 미세구조와 물성 변화를 연구하였다. FE-SEM 이미지 및 Micro-CT 분석을 통해 Dispersed turbine으로 제조한 폼의 평균 기공 크기가 Propeller로 제조한 기공보다 21.5% 작은 것을 확인하였다. 압축 강도는 작은 기공을 가진 폼에서 15.4% 향상되었고, 열전도도는 3.1% 감소하였다. 이러한 결과는 PUF 복합재 제조에 활용될 수 있다.
Abstract
Polyurethane foam (PUF) can be manufactured in soft, semi-rigid, and hard forms, so it is used in various fields industrially. Among them, rigid PUF has excellent mechanical properties and low thermal conductivity, and is used as a thermal insulation material for buildings and as a cold insulation material in the natural gas transportation field. In this field, there is a steady demand on higher mechanical strength and lower thermal conductivity. In this study, a rigid PUF was manufactured, and the microstructure and physical properties were studied according to the impeller type (propeller, dispersed turbine) of the agitator. Through FE-SEM and Micro-CT analysis, it was confirmed that the average pore size of the foam manufactured with the dispersed turbine was 21.5% smaller than that of the pore made by the propeller. The compressive strength was improved by 15.4%, and the thermal conductivity decreased by 3.1% in the foam with small pores. This result can be utilized for fabricating PUF composites.
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