Synergistic effects of ferric pyrophosphate (FePP) in intumescent flame-retardant polypropylene

2009 ◽  
Vol 22 (6) ◽  
pp. 870-876 ◽  
Author(s):  
Shibin Nie ◽  
Lei Song ◽  
Chenlu Bao ◽  
Xiaodong Qian ◽  
Yuqiang Guo ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Synergistic Effects ◽  
Intumescent Flame Retardant ◽  
Ferric Pyrophosphate

Synergistic Effects of Nanoporous Nickel Phosphates VSB-1 on Intumescent Flame Retardant Polypropylene Composites

2014 ◽  
Vol 881-883 ◽  
pp. 863-866
Author(s):  
Chao Peng ◽  
Shi Bin Nie ◽  
Lei Liu ◽  
Qi Lin He ◽  
Yuan Hu ◽  
...  
Keyword(s):  
Heat Release ◽  
Flame Retardant ◽  
Flame Retardants ◽  
Synergistic Effects ◽  
Intumescent Flame Retardant ◽  
Total Heat Release ◽  
Cone Calorimetry ◽  
Polypropylene Composites ◽  
Intumescent Flame Retardants ◽  
Nickel Phosphates

Nanoporous nickel phosphates (VSB-1) was synthesized by hydrothermal method. Then VSB-1 was added to the ammonium polyphosphate and pentaerythritol system in polypropylene (PP) matrix.The synergistic effect of VSB-1 with intumescent flame retardants (IFR) was studied by cone calorimetry test. The results of cone calorimetry show that heat release rate peak (pHRR) and total heat release (THR) of intumescent flame retardant PP with 2wt% VSB-1 decrease remarkably compared with that of without VSB-1. The pHRR and THR decrease respectively from 1140 to 286.0 kW/m2, and from 96.0 to 63.2 MJ/m2.

Synergistic effects of intumescent flame retardant and nano-CaCO3 on foamability and flame-retardant property of polypropylene composites foams

2017 ◽  
Vol 54 (3) ◽  
pp. 615-631 ◽  
Author(s):  
Li Depeng ◽  
Li Chixiang ◽  
Jiang Xiulei ◽  
Liu Tao ◽  
Zhao Ling
Keyword(s):  
Mechanical Properties ◽  
Stress Concentration ◽  
Flame Retardant ◽  
Synergistic Effects ◽  
Crystallization Rate ◽  
Intumescent Flame Retardant ◽  
Limit Oxygen Index ◽  
Scanning Calorimetry ◽  
Polypropylene Composites ◽  
Flame Retardant Property

Synergistic effects of intumescent flame retardant and nano-CaCO3 on foamability and flame retardant property of polypropylene composites and their foams were carefully investigated. The differential scanning calorimetry results showed that the intumescent flame retardant played a plasticizing effect on the polypropylene/intumescent flame-retardant composites and accelerated the crystallization rate. The rheological properties and supercritical CO2-assisted molding foaming behaviors of the polypropylene/intumescent flame retardant/nano-CaCO3 composites showed that the nano-CaCO3 could enhance their foamability. Scanning electron microscopy pictures and mechanical properties of the polypropylene/intumescent flame-retardant composites foams indicated that the agglomeration of intumescent flame retardant would reduce the cell uniformity and even cause the cell collapse. Furthermore, the stress concentration, caused by the agglomeration, could reduce the mechanical properties of the PP composites foams. The synergistic effect of the nano-CaCO3 could improve the cell uniformity and reduce the stress concentration so that the mechanical properties of the polypropylene/intumescent flame retardant /nano-CaCO3 composites foams were improved. Moreover, the polypropylene/intumescent flame retardant/nano-CaCO3 composites foams had the higher limit oxygen index values than the polypropylene/intumescent flame-retardant foams. TGA results also showed that the nano-CaCO3 could improve the thermal stability of the polypropylene composites foams by forming compact carbon layer. The experimental results indicated that the foamability of the polypropylene composites and the flame-retardant property of their foams could be improved by the synergistic effects of intumescent flame retardant and nano-CaCO3.

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