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Intumescent coatings using epoxy, alkyd, acrylic, silicone, and silicone–epoxy hybrid resins for steel fire protection

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Abstract

Intumescent coatings are a great alternative for passive protection of metal substrates against fire, with binder polymer being one of the main components of an intumescent system. The objective of this work was to compare five different resin types (epoxy, acrylic, alkyd, silicone, and silicone–epoxy hybrid) in an intumescent formulation and to study the influence of resin concentration on the fire protection performance of the coating. Results from TGA and MCC analysis of resins and coatings indicated that coatings containing silicone are thermally stable and release smaller amounts of heat. In the fire resistance test, samples containing epoxy and silicone resins had lower temperatures (130–160°C) compared to the other samples. It has also been found that it is possible to decrease resin concentration in formulations containing epoxy and silicone resins up to 25.6% and to maintain or even improve their fire protection capability.

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Acknowledgments

The authors thank the Brazilian government agencies CAPES, CNPq, and FAPERGS for funding the research. The authors also thank Evonik for providing Degalan® P675 Acrylic resin, SILIKOPON® EF hybrid epoxy–silicone resin, and DYNASYLAN® AMEO crosslinker; SGS Polímeros for supplying RESYGS SPG 6070 alkyd resin; and, finally, to National de Grafite Company for supplying the expandable graphite.

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Author notes

  1. Carlos H. M. Beraldo

    Present address: Departamento de Engenharia de Materiais, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil

Authors and Affiliations

  1. LAPOL/PPGE3M, Universidade Federal do Rio Grande do Sul, Campus Vale, Av. Bento Gonçalves 9500, 91501-970, Bairro Agronomia, Porto Alegre, RS, Brazil

    Andreza P. Cardoso, Stéphanie C. de Sá, Carlos H. M. Beraldo & Carlos A. Ferreira

  2. LAPROM/PPGE3M, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970, Porto Alegre, RS, Brazil

    Gelsa E. N. Hidalgo

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  1. Andreza P. Cardoso
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  2. Stéphanie C. de Sá
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Cardoso, A.P., de Sá, S.C., Beraldo, C.H.M. et al. Intumescent coatings using epoxy, alkyd, acrylic, silicone, and silicone–epoxy hybrid resins for steel fire protection. J Coat Technol Res 17, 1471–1488 (2020). https://doi.org/10.1007/s11998-020-00366-9

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