Thermal characterization of intumescent fire retardant paints

32nd UIT (Italian Union of Thermo–fluid-dynamics) Heat Transfer Conference

物理学;力学

Calabrese, L.^1 ; Bozzoli, F.^1 ; Bochicchio, G.^2 ; Tessadri, B.^2 ; Rainieri, S.^1 ; Pagliarini, G.^1

Department of Industrial Engineering, University of Parma, Parco Area delle Scienze 181/A, Parma

43124, Italy^1

National Research Council of Italy (CNR), Trees and Timber Institute-Fire Lab., Via Biasi, 75, San Michele all'Adige

38010, Italy^2

关键词: Commercial building;    Commercial coatings;    Equivalent thermal conductivities;    Estimation procedures;    Inorganic components;    Inverse heat conduction problem;    Passive fire protection;    Thermal characterization;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/547/1/012005/pdf
DOI  :  10.1088/1742-6596/547/1/012005

学科分类：力学，机械学

来源: IOP

【 摘 要 】

Intumescent coatings are now the dominant passive fire protection materials used in industrial and commercial buildings. The coatings, which usually are composed of inorganic components contained in a polymer matrix, are inert at low temperatures and at higher temperatures, they expand and degrade to provide a charred layer of low conductivity materials. The charred layer, which acts as thermal barrier, will prevent heat transfer to underlying substrate. The thermal properties of intumescent paints are often unknown and difficult to be estimated since they vary significantly during the expansion process; for this reason the fire resistance validation of a commercial coatings is based on expensive, large-scale methods where each commercial coating-beam configuration has to be tested one by one. Adopting, instead, approaches based on a thermal modelling of the intumescent paint coating could provide an helpful tool to make easier the test procedure and to support the design of fire resistant structures as well. The present investigation is focused on the assessment of a methodology intended to the restoration of the equivalent thermal conductivity of the intumescent layer produced under the action of a cone calorimetric apparatus. The estimation procedure is based on the inverse heat conduction problem approach, where the temperature values measured at some locations inside the layer during the expansion process are used as input known data. The results point out that the equivalent thermal conductivity reached by the intumescent material at the end of the expansion process significantly depends on the temperature while the initial thickness of the paint does not seem to have much effect.