Proceedings of The 5th International Conference on Modern Approaches in Science, Technology & Engineering
The Flame Retardancy of Charring Agent MTHEIC on Flame Retarded Polypropylene Composites
Shang Gao, Huimin Zou and Gousheng Liu
Charring agent MTHEIC was synthesized by using maleic anhydride (MAH) and tris(2-hydroxyethyl) isocyanurate (THEIC) as raw materials, its chemical structure was characterized by fourier transform infrared (FTIR) spectra, 1H-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℃ water 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.
Keywords: THEIC-based charring agent; Maleic anhydride; intumescent flame retardant; Water resistance.