Study on Environmental Protection PVF Fire Retardant Coatings for Carbon-Nitrogen-Sulfur-Silicon Steel Structure
In order to reduce the cost of fireproof coatings and achieve green environmental protection,a kind of environment-friendly polyvinyl formaldehyde(PVF)and its fireproof coating for steel structure were prepared.The effect of PVF addition on the physicochemical and fireproof properties of the coatings was studied,and the fire resistance mechanism was analyzed.The results showed that when the mass ratio of PVA to formaldehyde was 5.7∶3.5,adding about 2%urea and 0.2%hydrogen peroxide,the environmental protection PVF was prepared,and the formaldehyde content was in line with GB 18582-2020.PVF is positively correlated with the bond strength of the coating,and can enhance the bond strength of the coating,but has no effect on the basic properties of the coating,and has a significant effect on the fire resistance of the coating.The average temperature of the coated steel plate decreases first and then increases with the increase of the amount of PVF.When 7%-13%PVF was added,the foam thickness of the coating was greater than 3.3 cm,the temperature of the coating back was less than 300℃,and the minimum temperature was 220℃when adding 10%PVF.The pyrolysis of PVF occurs at about 297.3℃,and the residual carbon content at the end of phase transformation was about 23.8%.Both of them produce a large amount of flame retardant gas when heated,which mainly acts as gas source and a small amount of carbon source in the coating,PVF has good adhesion and film forming properties.
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