Tannic acid coated ammonium polyphosphate: For flame retardant and UV resistant of polypropylene.

• The trinity monocomponent intumescent flame retardant (IFR) named TAPP was successfully synthesized by microencapsulating the ammonium polyphosphate (APP) with 1, 10-diamino-decane (DA) and tannic acid (TA). • The addition of microencapsulated TAPP significantly enhanced the flame retardancy of polypropylene (PP). • UV resistance of PP composites was also improved due to the introduction of TAPP. Polypropylene (PP) has the advantages of excellent mechanical properties and easy molding, but its shortcomings such as high flammability and poor ultraviolet (UV) resistance cannot be ignored. In this paper, APP was used as the core, 1, 10-diamino-decane (DA) was used as a "bridge" to connect TA to the surface of APP, obtaining TAPP through oxidation self-polymerization. The addition of TAPP greatly improved the flame retardancy and UV resistance of PP matrix. The limiting oxygen index of the PP/22.5 %TAPP sample was increased to 31.0 %, and it was able to pass the UL-94 V-0 rating without droplet produced. Compared with PP samples, the peak heat release rate and peak smoke release rate of PP/22.5 %TAPP sample were reduced by 65.0 % and 44.7 %, respectively. In addition, the tensile strength and impact strength of PP/22.5 %TAPP samples decreased by only 2.7 % and 15.0 % after 60 h UV irradiation. The results showed that the addition of TAPP effectively improved the flame retardancy and UV aging resistance of PP. This study provides a feasible method for the preparation of anti-UV aging and flame-retardant PP composites. [ABSTRACT FROM AUTHOR]