Снижение горючести полиамида 6 с помощью неорганических окислителей

Abstract

The combustion behavior of polyamide 6 added with inorganic oxidants (MnO2, V2O5, BaO2, NaNO3, KNO3, Ca(NO3)2, Ba(NO3)2, K2Cr2O7, Ba(CIO4)2) was studied. It was found that the salts promote charring on the surface of the polymer, whereas the oxides do not. The best fire retardant effect was found for KNO3 which prevents dripping and favours of self-extinguishing of the polyamide after removing of the flame. Thermal decomposition behavior of the mixture polyamide 6/KNO3 was studied using thermogravimetry, differential scanning calorimetry and identification of solid products by infrared and X-ray diffraction. It was found that KNO3 reacts with the polymer producing thermostable products which form a protective char on the polymer surface.