Journal
PROGRESS IN ORGANIC COATINGS
Volume 150, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2020.105985
Keywords
Intumescent coating; Expandable graphite; Loading ratio; Scale of testing
Funding
- Singapore Ministry of National Development
- National Research Foundationunder L2 NIC Award [L2NICCFP1-2013-4]
- JTC through NTU-JTC I3C [RCA 16/277, RCA 17/365]
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This study focuses on the impact of varying the ratio of flame-retardant additives and the scale of testing on the thermal and fire performance of acrylic-based coatings. Ammonium polyphosphate, pentaerythritol, and expandable graphite are used as additives and play different roles in fire protection mechanisms.
This work explores the importance of varying the ratio of conventional flame-retardant additives and the scale of testing on the thermal and flammability/fire performance of acrylic-based coatings. Ammonium polyphosphate (APP), pentaerythritol (PER), and expandable graphite (EG) are used as intumescent additives by varying their ratios as 1:1:3 or 1:3:1 or 3:1:1. APP, PER and EG are used as acid source, carbonising agent and blowing agent, respectively. Despite the different roles of APP, PER, and EG, in all the compositions, the physical mechanism of exfoliation of graphite played an important role in offering the fire protection. With higher loadings of EG, the fire-resistance time was higher. However, there were clear differences in the protection extent when tested in a furnace under one-dimensional heat transfer conditions (bench-scale) as opposed to three-dimensional largescale testing. Parameters that are not intrinsic to the coating system like char cohesion, cracking, delamination from the substrate, rapid and non-directional expansion, and even higher heat fluxes experienced by the edges of the I steel section affect the fire performance.
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