High-salt-spray-resistance and high-weather-resistance two-component water-based primer-topcoat coating and preparation method thereof

The invention discloses a two-component water-based primer-topcoat coating with high salt mist resistance and high weather resistance and a preparation method of the two-component water-based primer-topcoat coating. The coating consists of a component A and a component B, the component A is prepared from 30 to 60 parts of water-based modified epoxy resin, 10 to 20 parts of water-based acrylic emulsion, 2 to 10 parts of coloring pigment, 8 to 15 parts of filler, 10 to 20 parts of anti-rust pigment, 5 to 10 parts of ceramic powder, 1 to 2 parts of dispersing agent, 0.1 to 0.5 part of defoaming agent, 0.2 to 0.5 part of wetting flatting agent, 1 to 4 parts of coalescing agent, 0.5 to 2 parts of anti-flash-rust additive, 1 to 2 parts of ultraviolet light absorber, 10 to 20 parts of pure water, 0 to 1 part of rheological additive and 5 to 10 parts of solvent; and the component B comprises the following components in parts by weight: 50-80 parts of an epoxy curing agent, 20-40 parts of a cosolvent and 5-10 parts of