Flame retardant polyamide fibres: The challenge of minimising flame retardant additive contents with added nanoclays.

Horrocks, Richard ORCID: 0000-0003-1431-058X, Sitpalan, Ahilan, Zhou, Chen ORCID: 0000-0002-5680-795X and Kandola, Baljinder K. ORCID: 0000-0002-3621-3724 (2016) Flame retardant polyamide fibres: The challenge of minimising flame retardant additive contents with added nanoclays. Polymers, 8 (8). p. 288. ISSN 2073-4360

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This work shows that halogen-free, flame retarded polyamide 6 (PA6), fabrics may be produced in which component fibres still have acceptable tensile properties and low levels (preferably ≤10 wt %) of additives by incorporating a nanoclay along with two types of flame retardant formulations. The latter include (i) aluminium diethyl phosphinate (AlPi) at 10 wt %, known to work principally in the vapour phase and (ii) ammonium sulphamate (AS)/dipentaerythritol (DP) system present at 2.5 and 1 wt % respectively, believed to be condense phase active. The nanoclay chosen is an organically modified montmorillonite clay, Cloisite 25A. The effect of each additive system is analysed in terms of its ability to maximise both filament tensile properties relative to 100% PA6 and flame retardant behaviour of knitted fabrics in a vertical orientation. None of the AlPi-containing formulations achieved self-extinguishability, although the presence of nanoclay promoted lower burning and melt dripping rates. The AS/DP-containing formulations with total flame retardant levels of 5.5 wt % or less showed far superior properties and with nanoclay, showed fabric extinction times ≤ 39 s and reduced melt dripping. The tensile and flammability results, supported by thermogravimetric analysis, have been interpreted in terms of the mechanism of action of each flame retardant/nanoclay type.

Item Type: Article
Additional Information: This article belongs to the Special Issue Recent Advances in Flame Retardancy of Textile Related Products
Uncontrolled Keywords: Fabrics, Nanoclay, Tensile Properties, Polyamide 6, Flammability, Aluminium Diethyl Phosphinate, Ammonium Sulphamate, Dipentaerythritol
Subjects: T Technology > T Technology (General)
Divisions: University of Bolton Research Centres > Institute for Materials Research and Innovation
SWORD Depositor: JISC Publications Router
Depositing User: JISC Publications Router
Date Deposited: 06 Dec 2019 15:51
Last Modified: 13 Jan 2020 17:22
Identification Number: 10.3390/polym8080288
URI: http://ubir.bolton.ac.uk/id/eprint/2234

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