Preparation and Application of Deformable and Orientable Intumescent Flame Retardants Incorporated with Polypropylene

Abstract

An environment-friendly and easily operational method, reactive extrusion was adopted to prepare intumescent flame retardant (IFR), melamine salt of pentaerythritol phosphate (MPP) with special rheological properties. The outstanding advantage of the extruded MPP is that the flame retardant can deform, orientate and form fibrillar morphology in resin matrix during the incorporation with PP, however, conventional MPP can only solid-state disperse in PP melt phase and obtain granulated morphology. The deformation and orientation mechanism of the extruded MPP were researched by scanning electron microscope (SEM) and differential scanning calorimeter (DSC). It proved that this fibrillar morphology of the flame retardant obviously improved the flame retardancy and mechanical performance of PP.