Title: UTILIZATION OF RECYCLED EPOXY TO IMPROVE PROPERTIES OF POLYPROPYLENE
Abstract: The automotive industry uses millions of lbs. of polypropylene in vehicles, with the majority of exterior parts requiring painting or surface treatments for aesthetic. The material has to maintain mechanical properties for minimally structural applications and superior properties in impact, examples bumpers. Most plastic bumpers are polypropylene (PP). PP is durable, flexible and is relatively cheap but on the downside, it has low surface energy making it difficult to bond with conventional adhesives and paints. Pretreatments to either raise PP’s surface energy or lower the adhesives surface energy promote bonding but make these plastic bumpers costly. This problem initiated the current study. This study focuses on raising the surface energy of PP by combining it with recycled epoxy in linear chain form, referred to as RTP. RTP has extremely high surface energy. The initial study involved compounding 10 wt. % RTP/ 90 wt. % commercially available PP and 20 wt. % RTP/ 80 wt. % commercial PP. The compounded material was then pelletized, extrusion compression molded, tested and characterized, and compared to the performance of neat PP. Preliminary data showed an increase in wettability, i.e. surface energy, and a good comparison between tension and flexure data. The preliminary data shows initiative for continuation of the study to see if the blend has potential to replace traditional PP where secondary operations are necessary for adhesion purposes.
Authors: Kristin N. Hardin, Selvum Pillay, Stefan Pastine
Conference: CAMX 2017 –Orlando