| abstract |
The prepainted steel sheet of the present invention is a base layer comprising a zinc or zinc alloy plating layer, a bottom coat layer formed by coating an aqueous undercoat paint dried at 80 ° C to 200 ° C PMT (Peak Metal Temperature) on the base layer; And a top coat layer formed by coating a top coat on the bottom coat layer. According to this, since the pretreatment process using chromate or non-chromate salt is not performed on the galvanized steel sheet, the installation cost of the separate coating equipment for performing the pretreatment process is greatly reduced, and thus the management cost is also reduced. There is. In addition, it is possible to minimize the content of the organic solvent by using a low-temperature curing aqueous base, thereby allowing sufficient drying at low temperatures, thereby reducing the process cost and emissions of carbon dioxide. |