The Effect of Wollastonite Filler on Thermal Performance of Intumescent Fire Retardant Coating

Abstract:

Various types of intumescent fire retardant coatings (IFRCs) have been used to protect the substrates exposed to fire. In current study, high temperature filler Wollastonite (W) filler was used to improve fire performance of intumescent fire retardant coating. The basic ingredients of the coating were ammonium poly-phosphate (APP) as acid source, expandable graphite (EG) as carbon source, melamine (MEL) as blowing agent in epoxy binder, boric acid as additive and hardener as curing agent. In this study a range of coating formulations were developed by using different weight percentages of Wollastonite filler. The coated steel substrate samples were tested for fire performance using Bunsen burner and char expansion was measured using furnace fire test. Composition of the char was determined by X-ray diffraction (XRD) technique. The char morphology was studied using field emission scanning electron microscopy (FESEM). Results showed that Intumescent coating with addition of Wollastonite filler enhanced anti-oxidation of the char. Presence of phosphorus, calcium and silicon in char layer further improved the thermal stability of char.

• Periodical: Advanced Materials Research (Volume 970)
• Pages: 328-331
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.970.328
• Online since: June 2014
• Authors: Muhammad Zia-ul-Mustafa*, Faiz Ahmad, Puteri S. M. Megat-Yusoff, Hammad Aziz
• Keywords: Char Composition, Char Morphology, Intumescent Coating, Thermal Performance, Wollastonite

References

[1] M. Jimenez, S. Duquesne, S. Bourbigot, Modelling of heat transfers on a steel plate. First approach in presence of intumescent coating, in the proceedings of the COMSOL Multiphysics User's Conference, (2005).

[2] J. Rhys, Intumescent coatings and their uses, Fire Mater. 4 (1980) 154-156.

[3] R. Otáhal, D. Veselý, J. Násadová, V. Zíma, P. Nemec, P. Kalenda, Intumescent coatings based on an organic-inorganic hybrid resin and the effect of mineral fibres on fire-resistant properties of intumescent coatings, Pigm. Resin Technol. 40 (2011).

DOI: 10.1108/03699421111147326

[4] M. Wladyka‐Przybylak, R. Kozlowski, The thermal characteristics of different intumescent coatings, Fire Mater. 23 (1999) 33-43.

DOI: 10.1002/(sici)1099-1018(199901/02)23:1<33::aid-fam667>3.0.co;2-z

[5] G. Wang, J. Yang, Influences of binder on fire protection and anticorrosion properties of intumescent fire resistive coating for steel structure, Surf. Coat. Technol. 204 (2010) 1186-1192.

DOI: 10.1016/j.surfcoat.2009.10.040

[6] M. Jimenez, S. Duquesne, S. Bourbigot, Intumescent fire protective coating: toward a better understanding of their mechanism of action, Thermochim. Acta. 449 (2006) 16-26.

DOI: 10.1016/j.tca.2006.07.008

[7] D.P. Bentz, Fire Resistive Materials: Thermal Barriers between Fires and Structures, in the proceedings of Thermal Conductivity 30/Thermal Expansion 18: Joint Conferences August 29-September 2, 2009 Pittsburgh, Pennsylvania, USA, DEStech Publications, Inc. 2010, p.108.

[8] W.F. Mohamad, F. Ahmad, S. Ullah, Effect of Inorganic Fillers on Thermal Performance and Char Morphology of Intumescent Fire Retardant Coating, Asian J. Sci. Res. 6 (2013) 263-271.

DOI: 10.3923/ajsr.2013.263.271

[9] Z. Han, Y. Li, H. Zhao, An investigation on synergistic effect of EG with IFR in polyethylene, in 8th International Conference on: Properties and applications of Dielectric Materials, 2006. pp.828-831.

DOI: 10.1109/icpadm.2006.284305

[10] G. Wang, J. Yang, Influences of expandable graphite modified by polyethylene glycol on fire protection of waterborne intumescent fire resistive coating, Surf. Coat. Technol. 204 (2010) 3599-3605.

DOI: 10.1016/j.surfcoat.2010.04.029

[11] S. Ullah, F. Ahmad, P. Yusoff, Effect of boric acid and melamine on the intumescent fire‐retardant coating composition for the fire protection of structural steel substrates, J. Appl. Polym. Sci. (2012).

DOI: 10.1002/app.38318