Epoxy-based flame retardant nanocomposite coatings: Comparison between functions of expandable graphene and halloysite nanotubes

Journal: Vol. 10, No.4, autumn 2017 - Article 7   Pages :  245 Until 252

Article Code:

Mohammad reza Saeb: Institute for Color Science and Technology - Departments of Resin and Additives
Henri Vahabi: Université de Lorraine - Chemistry
Maryam Jouyandeh: Lorrain University - Chemical engineering
Reza Khalili: University of Tehran - Polymer
Elnaz Movahedifar: Amirkabir University - Polymer

Article's abstract:

This work presents a study on the flammability of epoxy coatings containing two types of nano-scale fillers as potential flame retardants: expandable graphite EG and halloysite nanotubes HNTs. Both nanocomposites are prepared by incorporation of the same amount of nanofiller into the epoxy resin for the sake of comparison. Fire retardant nanocomposite coatings are cured through a two-stage procedure in a mold and oven, respectively. The cone calorimeter test is performed to investigate the effect of using these flame retardants on the peak of Heat Release Rate pHRR, Total Heat Release THR, Total Smoke Production TSP and Time-To-Ignition TTI. It was found that the thermal behavior of blank epoxy and epoxy/EG was quite different and loading EG leaded to a significant fall in pHRR. In the presence of EG, the thin layer of residue was formed at first stages of ignition, grown rapidly and became denser acting as a strong barrier against fire. This barrier could retard the burning and doubled the total time of burning. By contrast, HNTs could not affect as an efficient flame retardant in the epoxy-based coating. Even by high loading level of 9 wt., HNT could not influence pHRR, TTI and THR parameters.

Epoxy coating; Flame retardancy; Nanocomposites; Expandable graphene; Halloysite nanotubes.

References 1. Guo, Y., et al., In situ polymerization of graphene, graphite oxide, and functionalized graphite oxide into epoxy resin and comparison study of on-the-flame behavior. Industrial

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Prof. Zahra Ranjbar
Dr. Farahnaz Nourmohammadian
Assistant Editor:
Dr. Mozhgan Hosseinnezhad
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Institute for Color Science and Technology (ICST)

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