Abstract
Accidents involving fire occur every day around the world, affecting thousands of people and causing economic losses. Some accidents are caused by steel structure failures, which experience a significant reduction in mechanical properties at temperatures of 400-550˚C. Therefore, fire protective coatings are required for steel structures and interest in the development of intumescent coatings has increased considerably. In this study, black wattle tannin was used as a carbon source in the formulation of intumescent coatings. Concentrations of 5% and 10% of tannin were incorporated into a novolac resin. The coating was applied on a steel plate and the thermal protection was evaluated by sample exposure to a flame for 30 min. The results showed that the tannin compound could be used as a carbon source for intumescent coatings. The temperature of the samples containing 10% of this compound was almost 300 ˚C lower compared to the uncoated steel plate.
Highlights
The protection of wood and steel structures against fire can save many lives in cases of disaster
The composition of the intumescent system is described in detail in several reviews 5,8, but in general it consists of three components: an inorganic acid source, an expanding or blowing agent and a carbon source 9
The acid source is responsible for dehydrating the carbon source, which leads to the formation of char by the carbon source agent 9
Summary
The protection of wood and steel structures against fire can save many lives in cases of disaster. The use of intumescent coatings is gaining interest as an approach to protecting these structures against fire 3-5. The composition of the intumescent system is described in detail in several reviews 5,8, but in general it consists of three components: an inorganic acid source, an expanding or blowing agent and a carbon source 9. The carbon source typically has a substantial number of carbons and hydroxyl groups to enable the esterification reaction 7,9. In this regard, renewable materials, such as tannin and lignin, can be useful as the carbon source in intumescent coatings
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