The Role of Carbonized Layers for Fire Protection of Polymer Materials
| Autor: | B. Ya. Kolesnikov, Zulkhair Mansurov, V. L. Efremov |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
General Chemical Engineering 02 engineering and technology 010402 general chemistry Combustion 01 natural sciences lcsh:Chemistry Thermal conductivity General Materials Science Composite material chemistry.chemical_classification Thermal oxidation Thermal decomposition General Chemistry Polymer Epoxy 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences lcsh:QD1-999 chemistry visual_art Heat transfer visual_art.visual_art_medium 0210 nano-technology Intumescent |
| Zdroj: | Eurasian Chemico-Technological Journal , Vol 20, Iss 1, Pp 63-72 (2018) |
| ISSN: | 2522-4867 |
| DOI: | 10.18321/ectj709 |
| Popis: | The present work studies the processes occurring in pre-flame zone in the form of «candle-like flame» which is spread over the surface of epoxy polymer. As exemplified by epoxy polymer, it can be seen that the dominating mechanism of heat transfer from flame to pre-flame zone of carbonized polymers is a thermal conductivity by condensed phase (to phase). The mechanism of gasification processes in pre-flame zone is proposed. Gasification of the material in front of the flame edge is a controlling process, and when selecting flame retardants, it is necessary to register their ability to influence on kinetics and mechanism of gasification. The flame leading edge is bordered with the surface of polymer, which largely determines the nature of heat transfer in pre-flame region. Due to investigations of gas-phase composition at «candle-like» combustion of epoxy polymer it has been detected a considerable amount of oxygen (up to 10‒12%) near burning surface. Its presence facilitates the thermal oxidation of polymer, moreover the rate of thermal oxidation can significantly exceed the thermal decomposition rate of the polymer. The possibility to form the heat-insulating intumescent layer during decomposition of carbonizable polymers was used at development of flame retardant coatings ‒ complex multicomponent systems. Which in turns forms the intumescent carbonized layer with high porosity and low thermal conductivity, and protects based material or construction from premature heating up to critical temperatures. |
| Databáze: | OpenAIRE |
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