The process of coating metal with polyurethane emulsion can be divided into the following steps:

Surface Preparation: Before applying the polyurethane emulsion, the metal surface needs to be properly prepared. This typically includes cleaning the surface, removing oil, dust, and other impurities, and performing rust removal to ensure coating adhesion and durability. Rust removal can be done mechanically, chemically, or electrochemically.

Primer Application: Primer application is one of the key steps in metal paint spraying. The primer's role is to provide protection and adhesion to the metal surface, enhancing the coating's durability. Before applying the primer, it needs to be stirred and diluted to ensure a uniform and stable coating effect. Then, use a spray gun to evenly spray the primer onto the metal surface, carefully controlling the thickness and uniformity of the spray to avoid dripping and missed areas.

Polyurethane Emulsion Coating: Apply the polyurethane emulsion evenly to the metal surface. This can be done by spraying, brushing, or other suitable methods. Ensure the coating thickness is uniform and there are no missed areas.

Drying and Curing: After coating, the coating needs to be allowed to dry naturally or cured by heating. The drying time depends on the coating thickness and environmental conditions, generally ranging from several hours to several days.

Coating Inspection: After the coating has dried and cured, it needs to be inspected to ensure that its quality and performance meet requirements. Coating inspection may include visual inspection, adhesion testing, corrosion resistance testing, etc.

Please note that the specific coating steps may vary depending on the type of polyurethane emulsion used and the type of metal. In practice, specific process specifications and product instructions should be .

Sinograce Chemical produces waterborne polyurethane emulsions. Inquiries are welcome.