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Interactions between calcium carbonate and ammonium polyphosphate in low-borate concentration hydrocarbon intumescent coatings
For high performance of hydrocarbonintumescent coatings, interactions between the acid source ammoniumpolyphosphate (APP) and inorganic fillers can be critical. In the present work,low-borate concentration (i.e., 1 wt.% zinc borate) intumescent coatings with different concentrationratios of CaCO 3 to APP were studied in an attempt to map thereaction mechanisms. The analysis of the coating performance was conductedusing thermal insulation assessment according to the UL1709 fire curve(disregarding substrate load, geometrical diversity, and other full-scaleimplications of the complete standard), rheological measurements,thermogravimetric analyses (TGA), Fourier transform infrared spectrometer(ATR-FTIR), and X-ray diffraction (XRD). Results show that a coating with a CaCO 3 /APPmass ratio of 0.3 gives the best performance (i.e., the longest critical time ofsteel substrates to reach both 400 and 550 o C in the thermalinsulation assessment). The dependency on the CaCO 3 /APP ratio of thedynamic viscosity minimum points to significant interactions between CaCO 3 and APP during the softening state (i.e., the intumescence process) of thecoating. Due to an enhanced anti-oxidation property, the degradation zone ofthe intumescent char and the residual weight of the coating after exposure wereboth improved when increasing the CaCO 3 /APP ratio. The compositionaldevelopment of the intumescent char showed that CaCO 3 and APP reactto form a new polymeric phase, calcium catena-polyphosphate (CaP 2 O 6 ).This polyphosphate may contribute to the formation of a compact phase in theintumescent char and benefit the thermal insulation performance of low-borateconcentration hydrocarbon intumescent coatings.
Interactions between calcium carbonate and ammonium polyphosphate in low-borate concentration hydrocarbon intumescent coatings
For high performance of hydrocarbonintumescent coatings, interactions between the acid source ammoniumpolyphosphate (APP) and inorganic fillers can be critical. In the present work,low-borate concentration (i.e., 1 wt.% zinc borate) intumescent coatings with different concentrationratios of CaCO 3 to APP were studied in an attempt to map thereaction mechanisms. The analysis of the coating performance was conductedusing thermal insulation assessment according to the UL1709 fire curve(disregarding substrate load, geometrical diversity, and other full-scaleimplications of the complete standard), rheological measurements,thermogravimetric analyses (TGA), Fourier transform infrared spectrometer(ATR-FTIR), and X-ray diffraction (XRD). Results show that a coating with a CaCO 3 /APPmass ratio of 0.3 gives the best performance (i.e., the longest critical time ofsteel substrates to reach both 400 and 550 o C in the thermalinsulation assessment). The dependency on the CaCO 3 /APP ratio of thedynamic viscosity minimum points to significant interactions between CaCO 3 and APP during the softening state (i.e., the intumescence process) of thecoating. Due to an enhanced anti-oxidation property, the degradation zone ofthe intumescent char and the residual weight of the coating after exposure wereboth improved when increasing the CaCO 3 /APP ratio. The compositionaldevelopment of the intumescent char showed that CaCO 3 and APP reactto form a new polymeric phase, calcium catena-polyphosphate (CaP 2 O 6 ).This polyphosphate may contribute to the formation of a compact phase in theintumescent char and benefit the thermal insulation performance of low-borateconcentration hydrocarbon intumescent coatings.
Interactions between calcium carbonate and ammonium polyphosphate in low-borate concentration hydrocarbon intumescent coatings
Zeng, Ying (Autor:in) / Gricius, Zygimantas (Autor:in) / Weinell, Claus Erik (Autor:in) / Dam-Johansen, Kim (Autor:in) / Ring, Louise (Autor:in) / Kiil, Søren (Autor:in)
01.01.2022
Zeng , Y , Gricius , Z , Weinell , C E , Dam-Johansen , K , Ring , L & Kiil , S 2022 , ' Interactions between calcium carbonate and ammonium polyphosphate in low-borate concentration hydrocarbon intumescent coatings ' , Fire and Materials , vol. 46 , no. 3 , pp. 499-512 . https://doi.org/10.1002/fam.2994
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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