The invention discloses a composite nano
coating and a preparation method thereof and relates to the field of coatings. The formula of the composite nano
coating comprises raw materials and auxiliaries, the raw materials include an aqueous amino-acid resin, an aqueous
epoxy resin, nano
ion silver and nano
fumed silica, and the auxiliaries include a parting agent, a flatting agent, a dispersing agent, an
adhesive agent, an antifoaming agent,
purified water and
alcohol. The preparation method of the composite nano
coating includes weighing water borne
polyurethane and the aqueous
epoxy resin based on requirements, mixing the water borne
polyurethane and the aqueous
epoxy resin to obtain a mixture, dispersing the mixture for 5-15 minutes by a high-speed dispersion
machine, adding a certain amount of the nano
ion silver, the parting agent, the flatting agent, the dispersing agent, the
adhesive agent and the antifoaming agent, dispersing for 10-30 minutes, removing bubbles, adding the nano
fumed silica and the parting agent, adding a certain amount of the water and the
alcohol after the dispersion, fully dispersing for 30-50 minutes, and performing a nanoscale sanding. The composite nano coating has the advantages that the coating
adhesive force and the
thermal conductivity are high, and the coating is
corrosion resistant and has a
hydrophobic effect.