Abstract

The effects of fire retardant synergistic agents zinc borate (ZB), montmorillonite (MMT), manganese dioxide (MnO2) and stannic oxide (SnO2) on the mechanical properties, thermal degradation and flame retardant performance of wood flour–recycled polypropylene composites (WPC) comprised of intumescent flame retardants (IFR) were studied. The species were characterized by thermogravimetric analysis (TGA), limiting oxygen index (LOI), UL-94 tests, and cone calorimeter measurements. The results showed that the synergistic effect between IFR and ZB or MnO2 was greater than that of MMT or SnO2. The addition of 5wt% of ZB or MnO2, MMT and SnO2 created fire retardant WPC with a V0 rating, exhibiting excellent fire retardancy.

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