THERMOPHYSICAL PROPERTIES OF PINOCOX LAYER IN FIRE PROTECTION OF FABRICS WITH INTUMESCENT COATINGS

Abstract

The analysis of fire-retardant materials for textile materials was carried out and the scarcity of data for material processing, explanation and description of the process of fire protection, which leads to the ignition of fabric structures under the action of flame. Therefore, it is necessary to determine the conditions for the formation of a barrier to combustion and the spread of flame by the fabric and to establish a mechanism for inhibiting the transfer of temperature to the material. For this purpose, a method for determining the thermal conductivity during swelling of the coating is proposed, which allows to estimate the coefficient of thermal conductivity of the foam cocoa layer under high temperature action. According to experimental data and theoretical dependences, the volume heat capacity of the foam coke layer was calculated to be 429.5 kJ/(m³·K) and the thermal conductivity coefficient was 0.031 W/(m·K). As a result of research it is proved that the process of thermal insulation of textile material consists in the formation of soot-like products on the surface of the sample. Features of inhibition of the heat transfer process to the material, which is treated with an intumescent coating, are the formation on the fabric surface of a heat-protective layer of coke. The assessment of the maximum possible penetration of temperature through the thickness of the coating was performed. The temperature on the surface of the sample is significantly higher than the ignition temperature of the fabric, and on the unheated surface does not exceed 150 °C. Thus, there is reason to argue about the possibility of targeted regulation of fire protection processes of the fabric by applying coatings capable of forming a heat-insulating layer on the surface of the material, which inhibits the rate of heat transfer.