Posted on 31/07/2017 in News 32 2017
Phosphorus & recycled para-aramid fibres “green” FR

Aramid fibres offer high strength, temperature and chemical resistance, light weight and ageing qualities and para-amid fibres are inherently self-extinguishing. They are being increasingly used in a range of high-tech applications, resulting in a recycling challenge for recycling of the fibres.

In this paper, end-of-life para-aramid fibres were washed, then reacted to add phosphorus (by soaking in phosphoric acid for four minutes), dried, washed and finally dried again. The resulting phosphorus para-aramid material was tested as a flame retardant in thermoplastic polyurethane (TPU), at 0.25 – 1% dosing of phosphorus para-amid and at 1% non-phosphorus para-aramid. Phosphorus para-aramid at 1% reduced Peak Heat Release Rate of TPU by nearly 50% and improved char structure, and was more effective than non-phosphorus para-amid. The authors conclude that phosphorus-modified recycled para-amid fibres are an “environmentally friendly” flame retardant enabling reuse of waste para-amid fibres.


“A recycled environmental friendly flame retardant by modifying para-aramid fiber with phosphorus acid for thermoplastic polyurethane elastomer”, X. Chen et al. J. Hazardous Materials 2017 
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