Properties of flame‐retardant TPU based on para‐aramid fiber modified with iron diethyl phosphinate

• Published in: Polymers for advanced technologies 2019-01, Vol.30 (1), p.170-178
• Main Authors: Chen, Xilei, Wei, Zhibiao, Wang, Wenduo, Jiao, Chuanmei
• Format: Article
• Language: English
• Subjects: Cone calorimeters; Density; Enthalpy; flame retardant; Flame retardants; Heat release rate; Infrared analysis; Iron; iron diethyl phosphinate; modification; para‐aramid fiber; Polyurethane resins; Smoke; Thermogravimetric analysis; thermoplastic polyurethane elastomer; Urethane thermoplastic elastomers; Weight loss
• ISSN: 1042-7147; 1099-1581
• DOI: 10.1002/pat.4456

In this paper, a new type of flame retardant (AF‐Fe) based on para‐aramid fiber (AF) which was modified with iron diethyl phosphinate was applied for thermoplastic polyurethane elastomer (TPU). The flame‐retardant properties of TPU were tested using cone calorimeter test, smoke density test, and thermogravimetric analysis/infrared spectrometry. The cone calorimeter test showed that AF‐Fe can greatly reduce the heat release rate, total heat release, smoke factor, and other parameters of TPU composites compared with the sample of TPU/AF. For example, the pHRR of the composite with 1.0 wt% AF‐Fe was reduced by 15.19% compared with the sample with the same content of pure AF. In addition, the smoke factor of TPU/AFFe3 was reduced by 50.52% and 15.63% compared with TPU0 and TPU/AF respectively. The results of smoke density test showed that the luminous flux of TPU/AFFe3 was increased by 79.26% compared with the sample of TPU/AF. The TG results revealed that the sample with TPU/AFFe3 had lower weight loss rate and higher char residue content at 700°C compared with the sample of TPU/AF.