Comparison of Rheological Measurements During Mold Filling for Glycol and Amine Extended Urethane RIM Systems

Mold filling is an important aspect of the RIM process. Component tempera tures and viscosities, mold temperatures, gel times and material flowrate are all significant variables in the equation for optimal mold filling. In this work, an automated data collection system is used to monitor flow in a mold for two RIM processed systems; the use of a specially designed tool allowed the calculation of the viscosities of the reacting materials at different locations in the tool.