Effects of flame retardants on properties of waterborne fireproof paint for steel structures
[Introduction]To achieve the carbon peaking and carbon neutrality goals,the global waterborne paints market is growing.Meanwhile,the fireproof paints applied in petrochemical industry need to meet the requirement of special fire resistance.[Method]A waterborne intumescent fireproof paint for steel structures was prepared with vinyl acetate emulsion as binder.The effects of different flame retardants i.e.ethyl diphenylphosphinate,diphenyl anilinophosphonate,and diethyl(4-acetyl-phenyl)-phosphonate on the properties of the fireproof paint were studied by thermogravimetry,flame retardance testing,smoke density testing,and special fire resistance testing.[Result]After comprehensively evaluating the weight of carbon residue,decomposition temperature,oxygen index,UL 94 standard's horizontal/vertical burning test results,smoke density,and steel structure's temperature rising curve,the waterborne fireproof paint prepared with diphenyl anilinophosphonate was considered the best due to the fact that it exhibited the longest ignition time,slowest burning rate,least smoke density,and lowest final backside temperature of steel plate.[Conclusion]This paint meets not only all the property requirements for the steel structure fireproof paint used indoors based on the national standard GB 14907-2018 by itself,but also all the property indexes for outdoor applications when it is used in combination with a waterborne polyurethane topcoat,having promising application prospects in petrochemical industry.
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