Defining patterns in the fire protection of wood with reactive coating
DOI:
https://doi.org/10.15587/1729-4061.2024.317334Keywords:
reactive coating, wood preservatives, wood surface treatment, volatile combustion products, swelling of the coatingAbstract
An issue related to using a weatherproof reactive coating for fire protection of wood is to ensure resistance to high-temperature flame via application technology. Therefore, the object of research was the fire-retardant properties of reactive coating based on mixtures of organic-inorganic substances during interaction with flame. It has been proven that the samples of the reactive coating represent an accumulation of fine-dispersed equally sized substances surrounded by a polymer binder, which begin to decompose under thermal action; in particular, ammonium polyphosphate decomposes and releases phosphoric acid. That leads to the dehydration of pentaerythrite with the formation of soot while the decomposition of melamine is accompanied by the release of non-combustible gases that cause the soot to foam, thereby forming foamcoke. The mechanism of fire protection of wood has been established, which is related to the decomposition of flame retardants under the influence of temperature, the release of non-combustible gases, and the formation of a non-flammable coke residue. Thus, when the content of ammonium polyphosphate and pentaerythrite in the reactive coating was increased by 5 %, the volume of combustible gases decreased by more than 11 %, and the volume of nitrogen increased by more than 10 %. When their content was increased by 14 %, the volume of combustible gases decreased by more than 2 times, and the volume of nitrogen increased by more than 1.45 times. That also affected the formation of a foamcoke layer, which was recorded at the lowest content of ammonium polyphosphate at the level of 12 mm and increased for higher values up to 15.5 mm, and the multiplicity of foam increased by 1.25 times. The practical significance is that the results are taken into account when designing the reactive coating. Thus, there are reasons to assert the possibility of targeted regulation of the wood protection process by applying coatings capable of forming a protective layer on the surfacev
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Copyright (c) 2024 Yuriy Tsapko, Tetiana Tkachenko, Аleksii Tsapko, Ruslan Likhnyovskyi, Maryna Sukhanevych, Yuliia Bereznutska, Vitally Prisyazhnuk, Ruslan Klymas, Alisa Rotova
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