Posted on 07/09/2023 in Fire Safety 2023
Recycling PIN FR PET fibres

Jiuke Chen, Empa

Extruded PET (polyethylene terephthalate) fibres neat or with two different phosphorus PIN FRs (DOPO derivate DOPO-PEPA, phosphonate compound) were tested for mechanical recycling, with twin-screw extrusion – quench – spin-melt – reprocessing cycles (without ageing, total 3 extrusions). The neat PET showed little deterioration of properties with multiple extrusions. The phosphonate reacted with the PET during reprocessing causing cross-linking and brittleness. This, deterioration of the PET was mitigated by the DOPO derivate, which stabilised the recycled PET. A combination of these two PIN FRs showed compatibility with mechanical PET fibre recycling.

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