Polyethylene flame retarded with expandable graphite and a novel intumescent additive
Loading...
Date
Authors
Focke, Walter Wilhelm
Kruger, Hermanus Joachim
Mhike, Washington
Taute, A.T. (Albertus)
Roberson, Albert
Ofosu, Osei
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley-Blackwell
Abstract
A novel intumescent additive was synthesized by neutralizing 3,5-diaminobenzoic acid hydrochloride
salt with ammonium dihydrogen phosphate. This compound, which melts at 257 °C, decomposes
concurrently to release carbon dioxide gas. The flame retardant performance of this compound as a
primary fire retardant and in combination with expandable graphite was evaluated by cone calorimetry.
Cone calorimeter results revealed that addition of 10 wt.% expandable graphite alone lowers peak heat
release rate of carbon black-pigmented polyethylene from 710 ± 109 kW m-2 to 342 ± 15 kW m-2, while
addition of 27 wt.% of the novel intumescent lowered it to 400 ± 16 kW m-2. Combinations of these two
additives were able to decrease the peak heat release rate even further. Furthermore, the novel
intumescent additive reduced the flame out time from 773 ± 307 s to 537 ± 69 s although all other
expandable graphite containing samples increased it.
Description
Keywords
Polyethylene flame, Expandable graphite, Novel intumescent additive, Flame retardance, Polyolefins, Composites, Graphite
Sustainable Development Goals
Citation
Focke, WW, Kruger, HJ, Mhike, W, Taute, A, Roberson, A & Ofosu, O 2014, 'Polyethylene flame retarded with expandable graphite and a novel intumescent additive', Journal of Applied Polymer Science, vol. 131, no. 13, art. 40493, pp. 1-8.