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Charring agent MTHEIC was synthesized by using maleic anhydride (MAH) and tris(2hydroxyethyl) isocyanurate (THEIC) as raw materials, its chemical structure was characterized by fourier transform infrared (FTIR) spectra, H-NMR spectra and elemental analysis. The synergistic effects between MTHEIC and ammonium polyphosphate (APP) on flame retarded polypropylene (PP) were investigated. Results illustrated that when mass ratio of APP/MTHEIC 2:1 with 30 wt% IFR loading, PP/IFR composites could reach LOI 35.2% and pass UL-94 V-0 rating. Results from SEM, TGA and FTIR indicated that a continuous and intumescent char layer was formed during combustion. Cone colorimeter results indicated that the IFR could reduce pHRR and THR by 70.6% and 22.0%, respectively, compared to neat PP. The PP/IFR composites passed UL-94 V-0 rating after soaking in 70 °Cwater for 120h when IFR was 30 wt% with mass ratio APP/MTHEIC 2:1, and UL-94 V-1 rating could be reached after 144 hrs. Tensile strength and flexural strength of PP/IFR composites decreased by 28.1% and 19.5%, respectively, compared with neat PP.

The Flame Retardancy of Charring Agent MTHEIC on Flame Retarded Polypropylene Composites