Development of Intumescent Flame Retardant for Polypropylene: Bio-epoxy Resin Microencapsulated Ammonium-polyphosphate

As polypropylene (PP) has no charring ability on its own due to the lack of hydroxyl functional groups, flame retardant system needs addition carbonizing agent in a relatively great amount. Ammonium-polyphosphate (APP), conventional additive was modified by microencapsulation with sorbitol-based bioepoxy resin shell create an intumescent enhanced for PP. The efficiency microencapsulated additive, which contains all components needed effective system, evaluated PP matrix at different loadings.When compared physical mixture component, microencapsuated form APP (MCAPP) found have improved LOI values MCAPP containing samples increased 8–11 V/V% besides achieved V-0 classification according UL94 test. During cone calorimeter tests, burning intensity reduced (peak heat release rate decreased 20–35% and shifted time), amount charred residue obtained, based calculated Flame Retardancy Index (FRI) “Excellent” fire performance when used. is attributed interaction between core readily available shell, promoted formation char accompanied protecting barrier efficiency.