Influence of the monomers feed ratio on the polyurethane reaction in RIM

摘要

Reaction Injection Moulding (RIM) is a reactive process for polymer processing where two, or more, monomers, having low viscosity, impinge at high speed in a cylindrical mixing chamber. The performance of the RIM process is highly dependent on the contacting of the two opposed monomer jet streams, i.e. of the mixing of the two monomers. Some relevant ratios were used in RIM mixing analysis, namely jets' momentum ratio, the jets' kinetic energy ratio and the jets' flow. Mixing under controlled conditions has been study since the seventies of last century. This work assesses the influence of jet balances on final mechanical parts using the Adiabatic Temperature Rise (ATR). The results showed the importance of jet balance on mixture, namely kinetic energy ratio on kinetics polymerization.