Experimental Study on Thermal Diffusivity of Intumescent Fire-retardant materials

摘要

Thermal properties of intumescent fire-retardant materials are important parameters as input data in modeling combustion behavior of these materials in fire. However, Data regarding thermal properties especially thermal diffusivity of these composites are sparse. In this paper, intumescent fire-retardant polypropylene (IFR-PP) and char formed after the combustion of IFR-PP materials by the cone calorimeter at heat flux level of 50 kW/m~2 are studied to obtain the thermal diffusivity data of them. Study results show the value of thermal diffusivity for IFR-PP tends to decrease when the temperature increase especially in higher temperatures. Thermal diffusivity of char formed after the combustion of IFR-PP material decreases gradually with the rise of temperature. Thermal diffusivity value measured at room temperature could not be used as input parameters in a combustion model when it is established to simulate the burning behavior of IFR-PP composites in fire.