Flame retardant properties of polyamide 6 with piperazine pyrophosphate

ABSTRACT Piperazine pyrophosphate (PAPP) was mixed in polyamide 6 (PA6) to investigate its flame retardant properties. The PAPP was characterised by Fourier transform infrared (FT-IR), elemental analysis, proton nuclear magnetic resonance (1H-NMR) spectroscopy and thermogravimetric analysis (TGA). The elemental analysis and TGA results of PAPP indicated it had a high P element content and good thermal stability. The flame retardancy of PA6/PAPP was also characterised by TGA, limiting oxygen index (LOI), UL-94 vertical test and microscale combustion calorimetry (MCC). The TGA results showed that the PAPP increased the stability of the PA6/PAPP and resulted in a significant increase of char residue. PA6/PAPP passed the UL94 V-0 rating with a LOI value of 42 vol %. The MCC test indicated that the PAPP can greatly decrease the peak heat release rate (PHRR) and total heat release (THR). The results of scanning electron microscope (SEM) illustrated that PAPP can promote the formation of compact char layer.

[1]  Lei Song,et al.  Aluminum hypophosphite microencapsulated to improve its safety and application to flame retardant polyamide 6. , 2015, Journal of hazardous materials.

[2]  D. Rentsch,et al.  Bridged DOPO derivatives as flame retardants for PA6 , 2014 .

[3]  Jichun Liu,et al.  Thermal degradation behavior and fire performance of halogen-free flame-retardant high impact polystyrene containing magnesium hydroxide and microencapsulated red phosphorus , 2014 .

[4]  Dong Wang,et al.  Characterization, organic modification of wollastonite coated with nano-Mg(OH)2 and its application in filling PA6 , 2014 .

[5]  Daohai Zhang,et al.  Effects of thermal-oxidative aging on the flammability and thermal-oxidative degradation kinetics of tris(tribromophenyl) cyanurate flame retardant PA6/LGF composites , 2013 .

[6]  S. Bourbigot,et al.  Melamine integrated metal phosphates as non-halogenated flame retardants: Synergism with aluminium phosphinate for flame retardancy in glass fiber reinforced polyamide 66 , 2013 .

[7]  Lei Song,et al.  Facile synthesis of lanthanum hypophosphite and its application in glass-fiber reinforced polyamide 6 as a novel flame retardant , 2013 .

[8]  Sabyasachi Gaan,et al.  Recent developments in flame retardant polymeric coatings , 2013 .

[9]  Yu-Zhong Wang,et al.  Aluminum Hypophosphite versus Alkyl-Substituted Phosphinate in Polyamide 6: Flame Retardance, Thermal Degradation, and Pyrolysis Behavior , 2013 .

[10]  Dandan Yuan,et al.  The high efficiency two stage intumescent-contractive flame retardant on ABS , 2013 .

[11]  A. Holdsworth,et al.  Zinc stannate interactions with flame retardants in polyamides; Part 1: Synergies with organobromine-containing flame retardants in polyamides 6 (PA6) and 6.6 (PA6.6) , 2012 .

[12]  G. Malucelli,et al.  Cyclodextrin nanosponges as novel green flame retardants for PP, LLDPE and PA6 , 2012 .

[13]  Lei Song,et al.  A novel polymeric flame retardant and exfoliated clay nanocomposites: Preparation and properties , 2012 .

[14]  Yu-Zhong Wang,et al.  Flame retardation of glass-fibre-reinforced polyamide 6 by a novel metal salt of alkylphosphinic acid , 2011 .

[15]  J. Zuo,et al.  Preparation and properties of FR-PP with phosphorus-containing intumescent flame retardant , 2011 .

[16]  Jianqing Zhao,et al.  Synthesis, application and flame retardancy mechanism of a novel flame retardant containing silicon and caged bicyclic phosphate for polyamide 6 , 2011 .

[17]  Lei Song,et al.  Flammability and thermal degradation of epoxy acrylate modified with phosphorus‐containing compounds , 2009 .

[18]  S. Mallakpour,et al.  Direct polyamidation in green media : Studies on thermal degradation of novel organosoluble and optically active flame retardant polyamides , 2009 .

[19]  Shaoyun Guo,et al.  Surface modification of magnesium hydroxide and its application in flame retardant polypropylene composites , 2009, Journal of Materials Science.

[20]  Qi Wang,et al.  Synergistic effects of novolac-based char former with magnesium hydroxide in flame retardant polyamide-6 , 2008 .

[21]  Qi Wang,et al.  Thermal oxidative degradation kinetics of flame-retarded polypropylene with intumescent flame-retardant master batches in situ prepared in twin-screw extruder , 2007 .

[22]  Mingzhu Liu,et al.  Preparation and properties of coated nitrogen fertilizer with slow release and water retention , 2006 .

[23]  Qi Wang,et al.  Preparation, properties and characterizations of halogen-free nitrogen–phosphorous flame-retarded glass fiber reinforced polyamide 6 composite , 2006 .

[24]  W. Fan,et al.  Preparation and properties of halogen-free flame-retarded polyamide 6/organoclay nanocomposite , 2004 .

[25]  P. Gijsman,et al.  Differences in the flame retardant mechanism of melamine cyanurate in polyamide 6 and polyamide 66 , 2002 .

[26]  Richard H. Harris,et al.  Flammability Properties of Polymer - Layered-Silicate Nanocomposites. Polypropylene and Polystyrene Nanocomposites , 2000 .

[27]  Richard D. Peacock,et al.  Heat release rate: The single most important variable in fire hazard☆ , 1990 .