URETHANE RESIN SOLUTIONS FOR THE COATING OF STEEL PLATE AND PREPARATING METHODS OF ZINC COATED STEEL PLATE HAVING RESIN COATED LAYER

摘要

PURPOSE: An urethane resin composition for coating steel sheet is provided for better corrosion-resistance, workability and welding capability of the sheet by comprising the acrylurethane or esterurethane resin solution together with imine ester or melamine resin as the hardener in the composition. CONSTITUTION: The urethane resin composition for coating steel sheet having high corrosion-resistance, workability and welding capability to produce the improved galvanized sheet product comprises the acrylurethane or esterurethane resin solution; the imine ester resin or melamine resin in the amount of 2-6 phr or 10-30 phr based on the solid content of the resin composition, respectively; 2-20 phr of any one of the polyethylene wax or the polypropylene wax or the mixture thereof; 1.0-20 phr of at least one or two mixed metallic salt solution selected from NiSO4, MgSO4, MnSO4 and CuSO4 masked by 15-200 phr citric salt in terms of metal salt.