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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

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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.
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Keywords: Coatings technology; Epoxy resin; Fire retardants; Intumescent coating; Mineral fibres

Document Type: Research Article

Publication date: 05 July 2011

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