Slow-release dry-type aqueous inorganic zinc-rich coating and preparation method thereof

The invention relates to a slow-release dry-type aqueous inorganic zinc-rich coating. The slow-release dry-type aqueous inorganic zinc-rich coating mainly comprises a host agent and a curing agent, wherein the part by weight of the host agent to the curing agent is 100:30-100:50. The slow-release dry-type aqueous inorganic zinc-rich coating is prepared from a slow-release dry-type modifier which is matched with zinc powder and functional fillers, overcomes the rigorous condition restriction that when the conventional aqueous inorganic zinc-rich coating is applied to outdoor construction, wind force cannot be higher than the 3rd grade, and the temperature of base materials cannot be higher than 30 DEG C, can be coated on the surface of steel base materials subjected to sand blasting under the conditions that the outdoor wind force is at the 5th grade, and the temperature is 50 DEG C, can avoid the paint film defects of film cracking, film rolling in recoating and dry coating when the film thickness is 50-100 mu m, and plays an excellent role of anticorrosion on steel board workpieces. The slow-release dry-type aqueous inorganic zinc-rich coating is used for surface coating of steel boards and steel structure workpieces (such as oil tanks, air tanks and steel structure buildings) which are subjected to sand blasting.