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Issue 65, 2017, Issue in Progress
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One pot flame retardant and weathering resistant coatings for plastics: a novel approach

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Abstract

The self-stratifying approach is a one step process allowing the formation of a complex laminated coating structure at the surface of plastics or other substrates, combining optimized surface and adhesion properties. These coatings have already been developed for various application fields but have never been considered for fire retardant purposes, whatever the substrate involved. In this work, the self-layering concept has been used to make polycarbonate fire retardant, using a mixture of epoxy and fluoropolymer resins, and iron oxide as flame retardant additive (10 wt%). Self-stratification was evidenced by microscopic analyses. The flame retardant properties were evaluated according to Limiting Oxygen Index (LOI), UL-94 and Mass Loss Calorimetry (MLC). Weathering resistance by accelerated UV, thermal and humidity exposure was also considered. In the first part, the effect of solvent on the self-layering process was investigated. It was shown that the system diluted in a blend of butylacetate : xylene (1 : 1 ratio) exhibits a perfect stratification and excellent adhesion onto polycarbonate. In such a system, an outstanding improvement of the fire retardant properties (V0 rating at UL-94 and 32 vol% at LOI), unaffected by weathering (both UV and temperature/humidity exposure), was observed when a 200 μm wet thick coating was applied. The coating allows the formation of a protective barrier and the presence of metal particles avoids dripping and promotes a charring effect.

Graphical abstract: One pot flame retardant and weathering resistant coatings for plastics: a novel approach

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Publication details

The article was received on 20 Jul 2017, accepted on 11 Aug 2017 and first published on 21 Aug 2017


Article type: Paper
DOI: 10.1039/C7RA08028J
Citation: RSC Adv., 2017,7, 40682-40694
  • Open access: Creative Commons BY license
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    One pot flame retardant and weathering resistant coatings for plastics: a novel approach

    A. Beaugendre, S. Saidi, S. Degoutin, S. Bellayer, C. Pierlot, S. Duquesne, M. Casetta and M. Jimenez, RSC Adv., 2017, 7, 40682
    DOI: 10.1039/C7RA08028J

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