Abstract: The influence of spirophosphate cyanuric acid (SPCA) on the flame retardancy and mechanical properties of polypropylene (PP) was studied. When the content of SPCA was 25 %, the flame retardant efficiency was the highest and the limited oxygen index of PP was 25.6 %. The content of SPCA had no significant influence on the mechanical properties. With 25 % SPCA, the tensile, flexural, and impact strengths were 27.62 MPa, 38.03MPa, and 3.68kJ/m2, respectively. The thermal analysis showed that SPCA improved the high temperature stability of PP.

Key words: spirophosphate cyanuric acid, polypropylene, flame retardancy, mechanical property