Thermal degradation and fire performance of intumescent silicone-based coatings

This paper deals with the thermal degradation and fire performance of silicone‐based coatings for protecting steel. In this study, the fire performance of silicone coatings as virgin or formulated materials is evaluated using two homemade fire testing methodologies: one similar to the “torch test” f...

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Bibliographic Details
Published in:Polymers for advanced technologies 2013-01, Vol.24 (1), p.62-69
Main Authors: Gardelle, B., Duquesne, S., Rerat, V., Bourbigot, S.
Format: Article
Language:English
Subjects:
Applied sciences
Coatings
Coatings. Paints, varnishes and inks
Exact sciences and technology
Film formation and curing, properties, testing
Fires
Intumescent
intumescent coating
Polymer industry, paints, wood
Protective coatings
resistance to fire
silicone
Silicones
Structural steels
thermal conductivity
Thermal degradation
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Summary:This paper deals with the thermal degradation and fire performance of silicone‐based coatings for protecting steel. In this study, the fire performance of silicone coatings as virgin or formulated materials is evaluated using two homemade fire testing methodologies: one similar to the “torch test” fire testing method and the other using a heat radiator test. It was shown that the performance of the silicone‐based coating used as thermal barrier can be improved incorporating a modifier (a mixture of polydimethylsiloxane and silica coated by a silane). In this case, silicone‐based coating swells and exhibits same fire performance as commercial intumescent coating at the torch test. It is shown that the incorporation of modifier in the silicone makes it to swell upon heating resulting in the formation of expanded material exhibiting low heat conductivity. Thermal degradation of the coating is also investigated: it occurs in three main steps leading to the formation of a tridimensional network characterized by the formation of Q4 structure at high temperature. Copyright © 2012 John Wiley & Sons, Ltd.
ISSN:1042-7147
1099-1581
DOI:10.1002/pat.3050