Novel flame retardant polyurea composite coating
A new study introduces an enhanced flame retardancy and anti-impact performance of polyurea composite coating reinforced by modified ammonium polyphosphate and two-dimensional nano-fillers.
The protection performance of polyurea (PUA) coating is limited due to its intrinsic flammability. In order to develop a PUA composite coating with outstanding flame retardant and anti-impact performance simultaneously, modified ammonium polyphosphate (MAPP) and two-dimensional (2D) nanofillers of graphene oxide (GO) and Mg-Al layered double hydroxides (LDH) were introduced into PUA matrix. Thermal stability and combustion behavior of PUA composites were studied by thermogravimetric analyser and cone calorimeter.
Remarkable flame-retardant and fire protective performance
Results show that PUA composite sample with 17 wt% MAPP, 1.5 wt% GO and 1.5 wt% LDH exhibited remarkable flame-retardant and fire protective performance. The flame retardancy index increases to 1.7 from 1.0 with the time required to burn out and total heat release being dramatically decreased by 31.0 % and 33.4 %, respectively. The introduction of the flame retardant does not substantially damage the energy dissipating capacity and anti-impact performance of the PUA matrix. Interfacial properties of PUA composites were studied by standard avulse and shear methods. The PUA composites with LDH and GO could form stronger bonding with the steel compared to neat PUA.
The study has been published in Progress in Organic Coatings, Volume 180, July 2023.
