Preparation and properties study of intumescent flame retardant and toughening on polypropylene
A kind of flame retardant polypropylene(FRPP) is prepared by melt extrusion from PP,with PP-g-MAH as compatibilizer,SBS,EVA,CPE or MBS as toughener,and a new kind of IFR,which is prepared by mixing APP,PER,MEL and OMMT at 160 ℃.Some properties of new FRPP are tested by TGA,LOI,SEM and mechanical property test with different kinds of tougheners and different amount of OMMT,the properties including thermal stability,flame retardant,and mechanical properties.The results show that compared to pure PP,the LOI of FRPP increased from 17% to 31%,expecially for the systems with CPE(31%),the initial decomposition temperature raised to 459.5 ℃ from 440.8 ℃,and the char residue is improved by over 15% at 600 ℃.The addition SBS brings significant improvement to the system and OMMT has good help for its tensile strength,but no help for others system.Compared with the properties of all FRPP,the system with SBS as toughner and 1 phr OMMT can bring well flame retardant,and tensile property,during the toughness increasing.