Investigating the Effect of Clay Nanoparticles and Various Coatings on Increasing Thermal Properties and Fire Resistance of Wood

In this study, the effect of different coatings on improving flame resistance and fatigue temperature at the coating surface was investigated. Abies alba wood species and alkyd, polyurethane, oil, chromium, and phosphorescence coatings were used. Thermal weight tests and contact angle tests were also used to evaluate the performance of the coatings. The results of the flame resistance test, melting rate, mass reduction percentage, and carbonization level showed that the coatings resistances were different. In general, the best performance was for phosphorescence, chromium, oil, and polyurethane coatings, respectively. The results showed that alkyd coatings have the lowest resistance. Its mass reduction began at a temperature of about 50 to 75 degrees. One of the main reasons for the low resistance of alkyd coatings is its thinner, rigid, and fragile structures. The contact angle test results showed that after temperature fatigue treatments, the moisture absorption resistance in the coatings significantly reduced. The lowest and the highest contact angles were observed in the phosphorescent coated sample (60 ºC) and chromium coating (130 ºC), respectively.