Engineering analysis of reaction injection molding (RIM) process of polyurethane was carried out by simultaneously solving the balance equations of mass, momentum, and energy by a computer simulation. The polyurethane system evaluated was the reaction system of 4,4''-diphenylmethane diisocyanate(MDI) and poly(propylene glycol) (M_n:752) catalyzed by dibutyltin dilaurate (T-12). Basic data for simulation such as the reaction rate constants and the viscosity variations on time were obtained empirically by running adiabatic reaction. Temperature and conversion profiles at different points of the mold under constant temperature of heat transfer medium were obtained through computer simulation. The effects of reaction rate constant at feed temperature on conversion and temperature at fill time were discussed.

폴리우레탄의 반응사출성형 (Reaction Injection Molding)공정을 공학적으로 해석하였으며 이의 모사를 통하여 금형에서의 위치 및 시간에 따른 온도 및 전환율을 계산하였고, 각 변동인자들(반응속도, 충전속도)의 영향을 검토하였다. 폴리우레탄은 dibutyltin dilaurate(T-12)를 촉매로 한 4,4''-diphenylmethane diisocyanate (MDI)와 평균분자량 752인 poly(propylene glycol) (PPG)의 반응시스템이었으며 단열실험을 통하여 반응속도상수, 활성화에너지, 반응속도 차수등을 실험적으로 구하였다. 콤퓨터모사에 의하여 일정한 벽온도일때의 금형내의 온도등고선과 전환율등고선을 구하였으며, 반응속도상수가 충전완료시의 전환율과 온도에 미치는 영향을 고찰하였다.

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