| 摘要 |
A primer coating composition for steel sheet is provided to improve anti stiffener property and peeling resistance by forming electrolytic galvanized iron having a coated surface. A primer coating composition for steel sheet comprises galvanized sheet iron, a waterborne polyurethane primer layer formed in the upper side of galvanized sheet iron and a surface coating layer formed in the primer layer upper side. The waterborne polyurethane primer layer is consisting of waterborne polyurethane 40 - 90 weight%, leveling agent 0.01~5 weight%, 0.01~5 weight%, surface modification agent 0.01~ 5 weight% and water. The primer layer is consisting of metal particle 5~35 weight%.
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