Influence of Flame Retardant Additive on Thermal Behaviour and Stability of Fibre-Forming Polyamide 6

Abstract

This work presents a study of the infl uence of diethyl aluminum phosphinate (EOP) and sodium alumino silicate (ZP) as the novel green fl ame retardant spinning additives on the thermal properties of polyamide 6 (PA6) fi bres. The PA6/additive composite fi laments were prepared at 4 wt% concentration of additives and their mixture by melt spinning. The results show that the additives were physically incorporated into the PA6 fi lament, resulting in an insignifi cant change of the melting temperature. The presence of EOP decreased T onset and increased T max2 compared to pure PA6, which indicates that the degradation process started at lower temperature, whereas the thermo-oxidative stability in the second decomposition step increased. Contrary to EOP, ZP did not cause any noticeable changes in the decomposition temperatures comparing to pure PA6, but signifi cantly increased the fi nal char amount. Both phenomena were also observed when the additives were used in combination. Whereas EOP did not signifi cantly aff ect the mechanical fi lament properties, the incorporation of ZP resulted in the reinforcement of fi bres.

Flame suppression of polyamide through combined enzymatic modification and addition of urea to multilayer nanocoating

“…Several approaches have been used to make polyamide less flammable. Guanidine sulfamate/melamine polyphosphate mixtures [8], N-, Pand Si-mixtures [9], melamine cyanurate combined with carbon nanotubes and carbon black [10], aluminum phosphinate and sodium alumino silicate [11], and melt-spun prepared polyamide-6/9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) flame retardant composites [12] have each improved flame retardancy of nylon. Despite this improved flame resistance, these approaches alter the physical properties of the fibers, which limits their use.…”

Syntheses of intrinsically flame‐retardant polyamide 6 fibers and fabrics

“…Especially for PA6 fibers, literature on this subject is scarce and there is no acceptable solution especially for the melt‐spinning process of the fibers at this time. Despite some improvements in the production of PA6 filaments by using different additive combinations like adding zirconium phosphate and ammonium sulfamate or diethyl aluminum phosphinate with zeolithes or melamines and nanoclays, the direct incorporation of flame retardants into the polymer chain of PA6 are comparably rare.…”