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ZnS as fire retardant in plasticised PVC
The flame retardant effect of ZnS (zinc sulfide) in plasticized PVC-P (poly(vinyl chloride) was investigated. PVC-P containing different combinations of additives such as 5 % ZnS, 5 % Sb2O3 (antimony oxide) and 5 % of mixtures based on Sb2O3 and ZnS were compared. The thermal degradation and the combustion behavior were studied using TG-FTIR (TG (thermogravimetry) coupled with FTIR), or TG-MS (TG coupled with mass spectrometry), and a cone calorimeter, respectively. A detailed and unambiguous understanding of the decomposition and release of the pyrolysis products was obtained using both TG-MS and TG-FTIR. The influence of ZnS, Sb2O3 and the corresponding mixtures on the thermal decomposition of PVC-P was demonstrated. Synergism was observed for the combination of the two additives. The combustion behavior (time of ignition, heat release, smoke production mass loss, CO production) was monitored versus external heat fluxes between 30 kW.m-2 and 75 kW.m-2 with the cone calorimeter. Adding 5 % of ZnS had no significant influence on the fire behavior of PVC-P materials beyond a dilution effect, whereas SbO2 worked as an effective fire retardant. Synergism of ZnS and Sb2O3 allowed to replace half of the amount of Sb2O3 by ZnO to obtain equivalent fire retardancy.
ZnS as fire retardant in plasticised PVC
The flame retardant effect of ZnS (zinc sulfide) in plasticized PVC-P (poly(vinyl chloride) was investigated. PVC-P containing different combinations of additives such as 5 % ZnS, 5 % Sb2O3 (antimony oxide) and 5 % of mixtures based on Sb2O3 and ZnS were compared. The thermal degradation and the combustion behavior were studied using TG-FTIR (TG (thermogravimetry) coupled with FTIR), or TG-MS (TG coupled with mass spectrometry), and a cone calorimeter, respectively. A detailed and unambiguous understanding of the decomposition and release of the pyrolysis products was obtained using both TG-MS and TG-FTIR. The influence of ZnS, Sb2O3 and the corresponding mixtures on the thermal decomposition of PVC-P was demonstrated. Synergism was observed for the combination of the two additives. The combustion behavior (time of ignition, heat release, smoke production mass loss, CO production) was monitored versus external heat fluxes between 30 kW.m-2 and 75 kW.m-2 with the cone calorimeter. Adding 5 % of ZnS had no significant influence on the fire behavior of PVC-P materials beyond a dilution effect, whereas SbO2 worked as an effective fire retardant. Synergism of ZnS and Sb2O3 allowed to replace half of the amount of Sb2O3 by ZnO to obtain equivalent fire retardancy.
ZnS as fire retardant in plasticised PVC
Schartel, B. (author) / Kunze, R. (author) / Neubert, D. (author) / Tidjani, A. (author)
Polymer International ; 51 ; 213-222
2002
10 Seiten, 9 Bilder, 4 Tabellen, 29 Quellen
Article (Journal)
English
PVC (Polyvinylchlorid) , Plastizierung , Entzündungsverzögerung , flammhemmendes Mittel , Zinkoxid , Antimonoxid , Mischung (Stoff) , Synergismus , FT-IR-Spektroskopie , Massenspektrometrie , thermogravimetrische Analyse , Kalorimeter , Brandverhalten , Zersetzung , Pyrolyse , Rauchentwicklung , Brandgefahr , Wärmefluss
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