RESEARCH OF THE MECHANISM OF FIRE PROTECTION OF FABRICS WITH INTUMESCENT COATINGS

Abstract

Describing the behavior of fire retardants and coatings, including swelling, at the time of formation of the insulating structure is a separate and complex task. In general, it covers both stages of the heat protection process: as a rule, the decomposition of flame retardants under the action of temperature with heat absorption and the release of non-combustible gases, and then - swelling of the coating formed by fire protection. Therefore, it is necessary to study the conditions for the formation of a barrier to thermal conductivity and the establishment of a fire protection mechanism from layer to layer of coke. In this regard, a study of the process of fire protection during the operation of the fire protection coating. According to the data obtained, it is found that the formation of volatile products under the action of high temperature on the coating takes place with the formation of non-combustible substances. It has been experimentally established that under the action of heat flow on fire-retardant samples there is an intensive release of inert gases and a reduction of combustibles in reverse order. This proves the effectiveness of fire protection. During the tests it was found that the intensity of the formation of the swollen layer of coke moves in the direction of elevated temperature. The results of determining the swelling capacity of the coating for the intumescent system showed that under the action of high-temperature flow the burnout of the material and the loss of coating weight are reduced more than twice due to the formation of high-temperature compounds. The coating under the action of high temperature forms a significant coefficient of swelling, promotes the formation of a heat-insulating layer of coke, preventing burnout of the fabric and the passage of high temperature to the material, which is confirmed by reduced heat of combustion. It was determined that the fire-retardant fabric has almost 1.3 times less heat of combustion and is characterized by thermal decomposition by reducing flammable gases by more than 50% and increasing inert gases by more than 8 times.