Influence of Aluminum Hydroxide and Expandable Graphite on the Flammability of Polyisocyanurate-Polyurethane Foams

Abstract:

The aim of this work was to verify the influence of expandable graphite (EG) and aluminum hydroxide (ATH) fillers on the flammability of polyisocyanurate-polyurethane (PIR). Limited oxygen index increased to 72.5 with an incorporation of 16 phr (parts per hundred of matrix) EG and 50 phr ATH into the matrix (total weight percent was 39.76%). Cone calorimetry was employed to study the flammability properties of these PIR/ATH/EG composites. Scanning electron microscopy analysis was conducted to study the char characteristics of the composites after the cone calorimetry tests. It was found ATH could effectively induce villi like particles, which made the intumescent char denser, on the surface of EG. The compact char layer could effectively impede the transport of bubbles and heat. ATH and EG accelerated the initial degradation and fluffy char was quickly generated on the surface. Thus, degradation products of the composite were slowed down and the diffusion of volatile combustible fragments to flame zone was delayed.

• Periodical: Applied Mechanics and Materials (Volumes 368-370)
• Pages: 741-746
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.368-370.741
• Online since: August 2013
• Authors: Wan Jin Wang, Kui He, Quan Xiao Dong, Yong Fan, Ning Zhu, Yi Bing Xia, Hai Feng Li, Jing Wang, Zhen Yuan, Er Po Wang, Xia Wang, Hong Wen Ma
• Keywords: Aluminum Hydroxide, Expandable Graphite, Flame Retardance, Polyisocyanurate-Polyurethane, Synergistic

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