▎ 摘　　要

NOVELTY - Preparing ultra-thin aqueous expansion type steel structure nano flame retardant coating comprises e.g. preparing inorganic nano flame-retardant complex by adding graphene and nano-silicon dioxide under the high temperature environment, fully mixing graphene and silicon dioxide, adding nano aluminum hydroxide with the same weight of graphene, adding into the A inorganic mixture, and fully mixing nano aluminum hydroxide with the A inorganic mixture, preparing inorganic nano flame retardant composite, and preparing ultra-thin aqueous expansion type steel structure nano flame retardant coating by uniformly mixing ammonium polyphosphate, pentaerythritol, melamine, nano titanium dioxide filler, auxiliary agent in water, and grinding to obtain B slurry, mixing the groove bottom with B slurry of inorganic nano-flame retardant composite fully stirring, thus fully dispersing the inorganic nano-flame retardant composite in the B slurry. USE - The method is useful for preparing ultra-thin aqueous expansion type steel structure nano flame retardant coating. ADVANTAGE - The nano flame retardant coating: has excellent performance, fast and uniform coating expansion, compact carbon layer. The method: can mix the graphene and nano silicon dioxide to form stable nano silicon dioxide-graphene system, then adds nano aluminum hydroxide, which forms the weak chemical bond of aluminum-oxygen-silicon, uses film contact mixing, improves the dispersion degree of the nano material, improves the hydrophobic performance of the flame retardant coating and improve the adhesive force of the flame retardant coating and the base material. DETAILED DESCRIPTION - Preparing ultra-thin aqueous expansion type steel structure nano flame retardant coating comprises (a) preparing inorganic nano flame-retardant complex by (a1) adding graphene and nano-silicon dioxide according to weight ratio of (1-3):1 under the high temperature environment, fully mixing graphene and silicon dioxide, preparing A inorganic mixture; (a2) adding nano aluminum hydroxide with the same weight of graphene under the high temperature environment, adding into the A inorganic mixture, and fully mixing nano aluminum hydroxide with the A inorganic mixture, preparing inorganic nano flame retardant composite; and (b) preparing ultra-thin aqueous expansion type steel structure nano flame retardant coating by (b1) uniformly mixing 10-15 pts. wt. ammonium polyphosphate, 10-20 pts. wt. pentaerythritol, 15-25 pts. wt. melamine, 8-20 pts. wt. nano titanium dioxide filler, 0.15-1 pts. wt. auxiliary agent in 10-30 pts. wt. water, and grinding to obtain B slurry, (b2) forming the B slurry film on the wall of the mixer contact forming a C slurry film; (b3) adding 5-25 pts. wt. inorganic nano-flame retardant compound at a rate of 0.2-0.5 pts. wt./minute and contacting with C slurry film to obtain D mixed solution, (b4) fully stirring the D mixed solution, and adding 15-45 pts. wt. film-forming agent, mixing at high-speed, preparing ultra-thin aqueous expansion type steel structure nano flame retardant coating, where the contact mixer comprises contact groove and a solid sand leakage, flowing B slurry from the groove wall of the groove contact and forming on the inner wall of the groove contact the lower end of the solid sand leakage is opened with a horn-shaped feed opening, where the feed opening is close to the inner wall of the groove contact the inorganic nano-flame retardant composite is uniformly flowed down from the feed opening of the solid phase sandglass, and forming on the inner wall of the groove contact the liquid film contact the B slurry falls into the bottom of the groove contact the groove contact of the groove is provided with stirring blade, then mixing the groove bottom with B slurry of inorganic nano-flame retardant composite fully stirring, thus fully dispersing the inorganic nano-flame retardant composite in the B slurry.