Abstract
With the wide application of leather products, higher requirements are put forward for its flame retardancy. In this work, in order to improve the flame retardant performance of leather, phosphorus flame retardant (PFR), nitrogen and phosphorus intumescent flame retardant (NPIFR), nitrogen and phosphorus flame retardant (NPFR) was added to the retanning process, respectively. The flame-retardant mechanism and the interaction relationship between flame retardant and leather was studied. The structure of leather with flame retardant was confirmed by FT-IR. The effects of flame retardant on flame retardant properties of leather were investigated by limiting oxygen index (LOI), vertical burning test, and cone calorimeter test (CCT), respectively. The results showed that three types of flame retardant can enhance the fire retardancy of leather. The leather with flame retardant added in retanning process exhibited a series of improved flame-retardant properties in comparison with blank leather (without flame retardant). Compared with that of blank leather, the highest LOI value of NPIFR leather reached 31.4% from 29.3%. The flame combustion time of all leather with flame retardant reduced, and flameless combustion time was almost 0 s. The time to ignition (TTI) increased and heat release rate (HRR) and fire growth index (FGI) decreased of sample with the increase of flame retardant. Furthermore, this technique might provide a route to synthesize the leather with flame retardant ability.
Published Version
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