Halogen-free flame-retardant polycarbonate composition and preparation method thereof

The invention discloses a kind of halogen-free flame-retardant polycarbonate composition, and it includes PC resin, PET resin, compatilizer, toughener, halogen-free flame retardants, synergistic flame retardant, antioxidant and other auxiliary agents；Wherein described halogen-free flame retardants is at least one of nitrogenous flame ratardant, phosphonium flame retardant and metal organic sulfonate fire retardant；The synergistic flame retardant is the flaky silicic acid salt compound of 0.5 100 μm of average grain diameter.The application is from the high halogen-free flame retardants of flame retarding efficiency, avoid the use of halogen containing flame-retardant, the fire resistance for improving PC/PET alloys is used together with synergistic flame retardant in addition, the halogen-free flame retardants can improve composition mobility to a high degree, and it is smaller to composition Effect on Mechanical Properties, the influence to toughness is especially reduced in the case of low cost, there is good flame retardant effect, suitable for thin wall parts, higher occasion is required especially suitable for use environment.