Flame Reterdation Mechanism of Polypropyrenes & Phenolic Laminates

This paper shows results obtained from investigating the correlation between combustion parameter and HBr flux density, to explain the difference in flame retardation mechanisms between flame retardant polypropylene and flame retardant phenolic laminate. The combustion parameter, the dominating factor in high molecular materials flame retardation at the time of an actual fire, was thought out from the standpoint of thermal decomposition behaviors for high molecular materials. In this paper, weight-loss rate, combustion efficiency, CO and CO2 generation rate, heat generation rate, heat evolution efficiency was taken up as the combustion parameter. It was clarified that HBr could mainly suppress the thermal decomposition reaction of resin in the flame retardant polypropylene, while it could suppress the exothermic reaction through the oxidation decomposition of thermal decomposition products in the flame retardant phenolic laminate. In regard to the HBr effect on oxidation reactions, it was found that HBr could mainly suppress the oxidation reaction (C + O2 → CO) in the flame retardant polypropylene, while it could mainly suppress the oxidation reaction (CO + O2 → CO2) in the flame retardant phenolic laminate.