Study of EPDM Compound Mixing Process: The Effects of Molecular Architecture

The mixing of an EPDM rubber compound is a critical step in the manufacturing process of various rubber products.  The mixing process is typically simple and direct, but proper selection of the EPDM grade and design of mixing procedures are critical in achieving a homogenously mixed compound.

Among all the variables, the molecular architecture of EPDM is the most important factor affecting the mixing process; the composition of EPDM, molecular weight distribution, and long chain branching distribution will determine how easily the EPDM compound can mixed.  Latest advancements in molecular catalysis and production technology make possible the precise control of EPDM molecular architecture that enables processors to achieve good and consistent mixing results.  This paper will review the effects of key mixing process parameters, i.e. polymer physical form, storage temperature, and mixer temperature to optimize the mixing time and the cycle of rubber compounds. Successful mixing of EPDM is dependent on good and consistent mixing procedures and the material characteristics of the EPDM polymer. By understanding and following some simple guidelines, the mixing procedure can be optimized in order to get the maximum value from their EPDM’s.