A char stratification approach to characterization and quantitative thermal insulation performance of hydrocarbon intumescent coatings

Abstract

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Thermal insulation performance and char formation and degradation mechanisms of boron-containing hydrocarbon intumescent coatings

“…which means that the level of ZB must be the determining factor for the thermal insulation, in good agreement with previous studies, which have shown that the presence of ZB can suppress the roles of other ingredients in the formulation [42]. Moreover, in the first 15 minutes (i.e., the first stage), the temperature-time curves of ZB10P and ZB20P are practically overlapping and hereafter the two curves start to diverge, which suggests that the insulation properties of the char formed and/or the process of char formation are of prime importance.…”

“…In addition, the decreased oxidation temperature is due to the decreased level of pigments, which again confirms the adverse influences of decreasing the level of pigments. The beneficial effects on char anti-oxidation of fillers and pigments have been reported in previous works [12,42,47].…”

“…To help explain the observations in Figures 3 and 4, the char morphologies for the coatings are shown in Figures 7 and 8. The char morphologies for the varying binder series, as illustrated in Figure 7, show that the char structures of ZB20B, APB20B and BA20B appear more compact than those of ZB10B, APB10B and BA10B, which explains the aforementioned longer critical time and better thermal insulation performance of ZB20B, APB20B and BA20B, as a more compact char structure provides a better insulating effect [42]. The bright parts in the chars of ZB20B, APB20B and BA20B are attributed to char oxidation, and the thickness of the bright layer can be taken as an indication of the degree of oxidation at the point in time when the experiment was halted.…”