Fire Performance Synergies of Metal Hydroxides and Metal Molybdates in Antimony-Free Flexible PVC

摘要

1. Replacement of antimony oxide with Kemgard HPSS in flexible PVC formulation containing metal hydroxides significantly reduces maximum smoke density (NBS – flaming mode), but at the same time diminishes LOI. Increase in Kemgard HPSS loading level can limit LOI loss. 2. Partial replacement of antimony oxide with Kemgard HPSS in flexible PVC formulation containing metal hydroxides is possible with minimum or no loss of FR properties. 3. In the absence of MDH, partial replacement of an ATH with Kemgard HPSS leads to significant improvement of FR properties indicating FR synergy between the two materials. No similar synergy was observed between ATH/MDH blend and Kemgard HPSS. 4. Addition of zinc borate to flexible PVC formulations containing metal hydroxides and Kemgard HPSS does not improve FR properties. 5. TOTM enhances PVC compound FR robustness when compared to the DINP/DTDP combination. This offers a means to potentially reducing the total FR use for the TOTM plasticized systems. 6. Using Kemgard HPSS to replace antimony oxide can sustain the differentiated FR characteristics that results from use of TOTM.