Coating material for coated metal plate
The purpose of the present invention is to provide a coating material that is for a coated metal plate, that has high storage stability, that is less likely to contaminate a heating device, and that can be used to produce a coated metal plate having a surface on which rain streaks are less likely to occur and having high scratch resistance. The coating material contains a silicone resin including 5-50 mol % of a silanol group with respect to the total number of moles of Si atoms.
1. A coated metal sheet obtained by a process comprising the steps of:
applying a compound to a surface of a metal sheet to form a coating film, the compound comprising:
a silicone resin containing silanol groups in an amount of 5 to 50 mol % relative to the total number of moles of Si atoms;
a binder resin comprising a polyester resin or an acrylic resin not having a silyl group; and
an organic solvent;
wherein the silicone resin and the binder resin are each dissolved or dispersed in the organic solvent; and
the silicone resin contains Si atoms derived from trialkoxysilane in an amount of 50 to 100 mol % relative to the total number of moles of Si atoms; and
subjecting a surface of the coating film to a hydrophilization treatment through a flame treatment.
2. The coating material for a coated metal sheet according to claim 1 , wherein a proportion of a number of moles of aryl groups directly bonded to Si atoms based on a number of moles of alkyl groups directly bonded to Si atoms is 20 to 80% in the silicone resin.