Primer coating for polyurethane sealant and preparation method thereof

The invention discloses a primer coating for a polyurethane sealant, in particular relates to a primer coating with high initial adhesive strength for the polyurethane sealant and a preparation method thereof and belongs to the technical field of adhesives. The primer coating is prepared from the following raw materials: 50-70 parts of hard resin containing isocyanate groups, 5-15 parts of silane compound, 10-20 parts of polyisocyanate and 5-10 parts of non-reactive thermoplastic resin. The polyurethane primer coating prepared by the method has high initial adhesive strength for different base materials and is high in curing speed and firm in adhesion, the polyurethane adhesive/sealant can be coated without waiting, and the production efficiency of the automobile glass assembly line can be improved.