Author(s)

Yue Bao

Corresponding Author

Yue Bao

Abstract

Ammonium polyphosphate/polypropylene (APP/PP) flame retardant composites were prepared by melt blending extrusion. The impact properties, tensile properties and melt flow rate (MFR) of the composites were tested and characterized, and their mechanical properties and flame retardancy were compared. The effects of APP content on the melt flow rate, thermodynamic behavior, crystallization behavior and mechanical properties of flame retardant composites were discussed. The results showed that the addition of flame retardant APP significantly reduced the flammability of PP, and APP The results showed that the addition of flame retardant APP significantly reduced the flammability of PP, and APP had the role of catalytic carbonization and anti-melting drop in the combustion process of composite materials; With the increase of the addition amount With the increase of the addition amount, the thermodynamic stability of the composite increases, and the MFR decreases first and then increases; When APP content (mass fraction) is greater than 20%, APP has heterogeneous properties. When APP content (mass fraction) is greater than 20%, APP has heterogeneous nucleation effect on the crystallization of PP, which not only affects the mechanical properties of the composite, but at the same time, the interfacial bonding between APP and PP matrix is also improved. At the same time, the interfacial bonding between APP and PP matrix is also improved.

Keywords

Polypropylene, Ammonium polyphosphate, Flame retardant, Melt flow rate, Composites, Mechanical properties, Impact properties