V-2级阻燃聚丙烯材料的制备及性能研究OA

UL-94 V-2 grade flame-retardant polypropylene(PP)materials were prepared using a twin-screw extruder,and the effect of the flame retardant on the flame retardancy,limiting oxygen index(LOI),thermal resistance,and mechanical properties of copolymer PP and homopolymer PP were investigated.The results showed that the flame-retardant effect of the PP materials improved with increasing flame retardant loading.The content of the flame retardant increased the LOI of the PP materials,and the LOI increased gradually with increasing flame retardant content,with homopolymer PP exhibiting a higher LOI than copolymer PP.When 2.0%mass fraction of flame retardant was added to copolymer PP,the LOI increased from 17.1%to 21.3%.When 0.2%mass fraction of flame retardant was added to homopolymer PP,the LOI increased from 17.3%to 22.8%.The incorporation of the flame retardant reduced the thermal decomposition temperature and thermal resistance of the PP materials.V-2 grade flame-retardant copolymer PP required more flame retardant than homopolymer PP,while V-2 grade flame-retardant homopolymer PP demonstrated superior thermal resistance compared with copolymer PP.The addition of the flame retardant had little effect on the tensile strength of the PP materials,but decreased the elongation at break and notched Izod impact strength,while increasing the melt flow index.