Analysis And Research On Heat Transfer Process Of Intumescent Fire Retardant Epoxy Coating

Intumescent fire retardant Epoxy coating has excellent sealing ability, goodadhesion, corrosion resistance and mechanical strength. This is a hot topic of thepresent study as it has been widely used in the field of marine facilities, petrochemicaland oil devices. In this paper, Epoxy fire retardant coatings were prepared using acomplex formula method. The heat transfer properties and burning behavior of thecoatings were studied by cone calorimeter and multi channel data acquisitioninstrument. According to the laser flash method, the thermal parameters of the coatingsand their carbon residue were measured.Many physical and chemical factors such as incident heat flux, the content of fireretardants, the synergistic additive type and coating thickness that affect the heattransfer process of IFR-EP coatings were investigated through temperature curve ofIFR-EP coatings. And by scanning electron microscopy (SEM) with camera, thecarbon residue of coatings were studied to analyze the impact of the carbon layer onthe heat transfer process. The results show that the temperature in the interior ofsample decreases when it is far away from the surface, the combustion process of thecoating and its heat transfer process is closely connected and interacted. These variedfactors such as incident heat flux, the content of fire retardants can affect the heattransfer process of coatings remarkably. The formation of expansion char layer and itsstructure has a great influence on the temperature field. Compared to the coatings withEG as a flame retardant synergist, the coatings used Sb2O3and CP as a flame retardantsynergist has better performance on flame retardant properties, insulation properties.The measurement results of the thermal parameters of the coating and its carbonlayer showed: the samples have a different variation with its carbon layer in terms ofthermal diffusivity, thermal conductivity and specific heat capacity. Especially, thethermal conductivity of the sample is higher than its carbon layer which verified theresults from the research on heat transfer characteristics. Meanwhile the research ofsynergist content on thermal properties also showed that different synergist content ledto different levels of each thermal Property parameter.According to the analysis and study on the intumescent fire retardant coating under the condition of the cone calorimeter during burning process, a physical modelhas been established which can be used to describe the temperature rise process of thematerial; a mathematical model for the temperature rise process of the intumescentcoating has also been put forward based on the theory of the heat and mass transfer.The study shows that the model can appropriately predict the temperature distributionduring the temperature rise process, and the temperature distribution predicted by themodel are in fairly good agreement with the experiment results. Furthermore the modelcan study the sensitivity analysis of the thermal properties, in order to assess theinfluences of parameter on the material temperatures.