ANTIBACTERIAL AND ANTIMOLD PRECOATED STEEL SHEET EXCELLENT IN WEATHER RESISTANCE

摘要

PROBLEM TO BE SOLVED: To obtain a precoated steel sheet having excellent antibacterial property, corrosion resistance and weather resistance for a long time by forming a chemically treated film on the surface of a steel sheet, then forming a lower coating film and an upper coating film thereon, and incorporating a specified amt. of an inorg. antibacterial agent and an additive to improve weather resistance into the upper coating film. ;SOLUTION: Upper and lower coating resin layers are formed on a steel sheet. For the upper coating film, 0.3 to 7 pts.wt. of an inorg. antibacterial agent is compounded to 100 pts.wt. of the resin solid content. By controlling the compounding ratio to the above range, an enough effect to prevent mold is obtd. as well as the aggregating power of the resin is maintained. Further, an additive to suppress changes in colors by light is added by 0.1 to 3 pts.wt. to 100 pts.wt. of the resin solid content. As for the resin for the upper coating layer, a polyester resin or an acryl resin generally used for building materials is used. The inorg. antibacterial agent is added by fast stirring method. The upper coating film is formed to 8 to 33 μm thickness, considering the workability of coating and the appearance.;COPYRIGHT: (C)1998,JPO