Justification of the conditions of application of fire protective coating for wood
DOI:
https://doi.org/10.32347Keywords:
protective agents, fire resistance, mass loss, coating, surface treatment, wood burnAbstract
Abstract. Thus, experimental studies have established that an untreated sample of wood ignited under thermal action, the flame spread over the entire surface, which led to its combustion with a mass loss of more than 60 %, and the temperature of flue gases increased by more than 500 ºС in 60 s of testing. The use of an intumescent coating under the influence of temperature leads to the formation of a foam coke layer and inhibition of heat transfer of high-temperature flame to the material and a decrease in mass loss to 6.6 g/(m2ˑs) and a temperature of less than 160 ºС. During the study of the flame spread index, it was found that when the flame acted on untreated wood samples for 21 s, their ignition occurred, the temperature was 367 °С and intensive flame spread over the surface, the flame spread index was 43.5. During the tests of fire-protected wood samples, the following values were obtained, namely, the wood sample treated with an inorganic coating caught fire for 890 s, the flame spread over the surface occurred only to the first section, the maximum temperature of flue gases was 82 °С for a time greater than 2.5 times, and the flame spread index decreased by 6.5 times. For a sample of wood treated with a fire-retardant intumescent coating, the wood did not ignite, the flame spread index was 0. Thus, there is reason to argue about the possibility of directed regulation of fire protection processes in wood by using fire-retardant coatings capable of forming a protective layer on the surface of the material that slows down the rate of wood burning
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