▎ 摘　　要

NOVELTY - Preparation of graphene-like boron-nitride-based self-extinguishing aqueous fireproof coating involves weighing 0.1 g boron nitride/polyethyleneimine/sodium alginate sample and evenly dispersing it in 50 mL deionized water, adding zinc nitrate hexahydrate to the suspension, stirring for 2-3 hours, repeatedly washing with deionized water, centrifuging the resulting mixture, and freeze-drying to obtain a boron nitride/polyethyleneimine/sodium alginate-zinc hybrid material powder, mixing the hybrid material powder with an epoxy resin, a curing agent, an expansion system (melamine polyphosphate, dipentaerythritol, melamine), and a defoamer, mechanically stirring to form a uniform dispersion system, coating the uniform dispersion system on the surface of a steel sheet (sandblasted Sa2 grade), curing at room temperature for 7 days, and baking at 40℃C for 3 days to obtain a boron nitride/polyethyleneimine/sodium alginate-zinc-based self-extinguishing aqueous fireproof coating. USE - Preparation of graphene-like boron-nitride-based self-extinguishing aqueous fireproof coating used for steel structure. ADVANTAGE - The method produces graphene-like boron-nitride-based self-extinguishing aqueous fireproof coating having good water dispersion stability, good barrier property and pH stimulation-response function, and improved flame retardance, strength and toughness of the coating/carbon layer, prevents the carbon layer from cracking and falling at high temperature, and shows best smoke suppression effect. DETAILED DESCRIPTION - Preparation of graphene-like boron-nitride-based self-extinguishing aqueous fireproof coating involves weighing 0.1 g boron nitride and adding to 100 mL deionized water, ultrasonically processing for 1 hour to obtain a uniform dispersion, adding a certain amount of polyethyleneimine to the above dispersion, stirring for 6 hours, centrifuging the suspension, washing repeatedly with deionized water, drying to obtain a boron nitride/polyethyleneimine complex, ultrasonically dispersing 0.1 g boron nitride/polyethyleneimine complex in 100 mL deionized water, adding a certain amount sodium alginate to the boron nitride/polyethyleneimine suspension, stirring for 4 hours, centrifuging and washing three times under the condition of 7000-10000 rpm using deionized water to remove unreacted sodium alginate to obtain a boron nitride/polyethyleneimine/sodium alginate sample after freeze-drying, weighing 0.1 g boron nitride/polyethyleneimine/sodium alginate sample and evenly dispersing it in 50 mL deionized water, adding a certain amount of zinc nitrate hexahydrate to the suspension, stirring for 2-3 hours, repeatedly washing with deionized water, centrifuging the resulting mixture, and freeze-drying to obtain a boron nitride/polyethyleneimine/sodium alginate-zinc hybrid material powder, mixing the boron nitride/polyethyleneimine/sodium alginate-zinc hybrid material powder with an epoxy resin, a curing agent, an expansion system (melamine polyphosphate, dipentaerythritol, melamine), and a defoamer, mechanically stirring for 5-6 hours to form a uniform dispersion system, coating the uniform dispersion system on the surface of a steel sheet (sandblasted Sa2 grade), curing at room temperature for 7 days after brushing, and baking at 40℃ for 3 days to obtain a boron nitride/polyethyleneimine/sodium alginate-zinc-based self-extinguishing aqueous fireproof coating.