Abstract
In this paper, the flame retardant PP composites were prepared by melt blending. APP and bamboo flour are selected as flame retardant and smoke suppressant of the composite material. Among them, bamboo flour as a synergist can effectively improve the flame retardancy and smoke suppression effect of PP/APP composites. The effects of bamboo flour on the mechanical properties, crystallization behavior, thermal degradation, flame retardancy, and especially the smoke suppression effect of PP/APP composite materials were studied. TGA, LOI, cone calorimetry, SEM and other characterization methods were used to study the thermal stability, flame retardancy and combustion characteristics of the composites and the microscopic morphology of carbon residue. Experimental results show that when the total addition amount of APP/bamboo flour (2:1) in PP55/APP30/BF15 composite is 45%, the residual carbon has more specific surface area and micro-pores, which makes the composite have the best smoke suppression effect. The PHRR of the PP55/APP30/BF15 composite was reduced to 308.2 kW/m2 and the amount of carbon residue is 25%. The continuous carbon layer formed during combustion can effectively protect the matrix material and prevent heat transfer.
Highlights
Polypropylene (PP) is a thermoplastic polymer with excellent comprehensive properties, and it is widely used in construction, packaging, transportation and furniture (Kumar et al, 2017)
In order to analyze and study the dispersion of flame retardants in PP, the splines were brittlely broken under the condition of liquid nitrogen, and the cross-sectional morphology of the samples was analyzed by scanning electron microscopy (SEM)
This is due to the agglomeration of Ammonium Polyphosphate (APP) and bamboo flour (BF), which reduces the compatibility with the matrix
Summary
Polypropylene (PP) is a thermoplastic polymer with excellent comprehensive properties, and it is widely used in construction, packaging, transportation and furniture (Kumar et al, 2017). The effect of flame retardancy via adding BF and APP into PP and studying of its smoke suppression performance has rarely been reported.
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