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Intumescent coatings based on an organic‐inorganic hybrid resin and the effect of mineral fibres on fire‐resistant properties of intumescent coatings

R. Otáhal (Faculty of Chemical Technology, Institute of Chemistry and Technology of Macromolecular Materials, University of Pardubice, Pardubice, Czech Republic and Synpo, a.s., Pardubice, Czech Republic)
D. Veselý (Faculty of Chemical Technology, Institute of Chemistry and Technology of Macromolecular Materials, University of Pardubice, Pardubice, Czech Republic)
J. Násadová (Synpo, a.s., Pardubice, Czech Republic)
V. Zíma (Faculty of Chemical Technology, Joint Laboratory of Solid State Chemistry, University of Pardubice, Pardubice, Czech Republic)
P. Němec (Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic)
P. Kalenda (Faculty of Chemical Technology, Institute of Chemistry and Technology of Macromolecular Materials, University of Pardubice, Pardubice, Czech Republic)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 5 July 2011

Abstract

Purpose

The purpose of this paper is to study properties of intumescent coatings based on a silicone‐epoxy hybrid resin (with an aminosilane as hardener). In the first part of this study, fire‐resistance behaviour of the intumescent coating based on silicone‐epoxy resin containing intumescent additives is evaluated. The second part assesses the effect of mineral fibres on fire‐resistant properties of intumescent coatings based on the silicone‐epoxy resin.

Design/methodology/approach

Thermal degradation and char formation of coatings were investigated by Thermogravimetric analyses, X‐ray diffraction and X‐ray fluorescence and infrared spectroscopy (FTIR). The salt spray corrosion test was applied to study the resistance of intumescent coatings. Anticorrosion and fire‐resistant properties after one, three and seven days of exposure were evaluated.

Findings

It was shown that a silicone‐epoxy hybrid resin is suitable for applications in the field of intumescent coatings. Intumescent coatings based on this resin form a thermally stable thin ceramic‐like layer, which improves the thermal insulation properties of the char. Mineral fibres reinforced the char structure and thus improved fire‐resistant properties of intumescent coating before as well as after the salt spray test. Mineral fibres also improved anticorrosion properties.

Research limitations/implications

This paper discusses only the effect of mineral fibres on properties of intumescent coatings.

Originality/value

A silicone‐epoxy hybrid resin has not previously been used in intumescent coatings. This type of intumescent coating can be used as an effective passive fire protection system for steel constructions.

Keywords

Citation

Otáhal, R., Veselý, D., Násadová, J., Zíma, V., Němec, P. and Kalenda, P. (2011), "Intumescent coatings based on an organic‐inorganic hybrid resin and the effect of mineral fibres on fire‐resistant properties of intumescent coatings", Pigment & Resin Technology, Vol. 40 No. 4, pp. 247-253. https://doi.org/10.1108/03699421111147326

Publisher

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Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited