Guidelines for the Re-Stabilization of Post-Consumer Recycled Plastics
Recycling of plastics is the preferred option for dealing with unavoidable plastic waste. The recycled polymer may have undergone degradation during its first use as virgin material. Such degradation can have two effects on recyclability. Firstly, it can lead to a change in physical and mechanical properties with respect to virgin material. Secondly, it can also render a polymer more susceptible to further degradation during re-use. Such susceptibility can be a result of the formation of oxidative by-products which initiate or otherwise take part in further degradation reactions.
This paper will first discuss the recycling situation in Hong Kong and a literature review on work that has been done in recyling plastics through re-stabilization. We will also discuss the degradation in Polypropylene (PP), Polyethyelene (PE), and Polypropylene Ethylene Propylene Diene Monomer (PP/EPDM) occuring during their first life in applications such as film, bumpers, cups, etc. and the fate of stabilizers that were added to the virgin material. We will focus on the use of stabilizers which can give processing, long term heat stability and light stability on recycled plastics. Some data charts on the advantages of using stabilizers in the mechanical and physical properties of the plastics will also be included.
KeywordsImpact Strength Hinder Amine Light Stabilizer Plastic Waste Melt Flow Index Twin Screw
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