Effects of Hybrid Fibre Reinforcement on Fire Resistance Performance and Char Morphology of Intumescent Coating

Abstract

Abstract. Recent researches of fire retardant intumescent coatings reinforced by single Rockwool and single glass wool fibre at various weight percentages and lengths showed some improvements to the mechanical properties of the coatings and the char produced. Therefore, in this research the fibres were combined together in intumescent coating formulation at several weight percentages and fibre lengths to study their effects towards fire resistance performance and char morphology. The hybrid fibre reinforced intumescent coatings were subjected to two types of fire tests; Bunsen burner at 1000 o C and the electric furnace at 800 o C for 1 hour, respectively. Steel temperature of the coated samples during Bunsen burner test was recorded to determine the fire resistance performance. Thermal stability of the intumescent coatings and chars was determined by Thermogravimetric Analysis (TGA). The morphology of the coatings and char was then examined by using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometry (EDS) was conducted to obtain elemental composition of the samples. This research concluded that long-hybrid fibre at 12-mm length and 0.6% fibre-weight produced the top performing hybrid fibre intumescent formulation. The hybrid fibres form survived at elevated temperature, hence helped to provide structure and strengthen the char with the highest fire resistance was recorded at steel temperature of 197 o C.

Flame Retardant Coatings: Additives, Binders, and Fillers

“…Because char foam acts as a physical barrier to heat and mass transfer, it interferes with the combustion process [73,97,123]. As mentioned earlier, three elements are required for a mixture to be an efficient intumescent system: inorganic acid (dehydrating agent), blowing agent (spumific), and carbon-rich polyhydric material as a char former (carbonific) [124,125]. The ratios in which the various compounds are present are also a critical concern, where the best ratio has to be resolved experimentally.…”

“…The ratios in which the various compounds are present are also a critical concern, where the best ratio has to be resolved experimentally. One or more of these substances could be substituted for others in the same class or group in which further research has revealed that incorporating As mentioned earlier, three elements are required for a mixture to be an efficient intumescent system: inorganic acid (dehydrating agent), blowing agent (spumific), and carbon-rich polyhydric material as a char former (carbonific) [124,125]. The ratios in which the various compounds are present are also a critical concern, where the best ratio has to be resolved experimentally.…”

Effects of coating ingredients on the thermal properties and morphological structures of hydrocarbon intumescent coating chars

“…It suggests that the reactivity of this fiber is quite limited and only the very surface of the fiber can react with derivatives of APP at high temperatures. In fact, the rod-shaped fiber was more likely to play a role of physically reinforcing the network to keep the char integrity [44,47]. Thus, without the support of the fiber (i.e.…”

Effects of bagasse fiber as the renewable environmentally friendly material on the properties of the waterborne intumescent fireproof coating

“…According to the previous reports, bagasse has many peculiarities, such as renewability, tenacious, biocompatibility and environmental friendliness. Thus, the bagasse was used to enhance the mechanical strength, aging resistance and so on 20 …”