| 摘要 |
A zinc-plated steel plate having a high press formability and a high corrosion resistance, consisting of a steel plate, a layer of coating of zinc formed on at least one surface of the steel plate, a film of chromate formed on the layer of coating of zinc, and a film of a resin formed on the chromate film. The resin film consists of a solvent thermosetting resin, a solid internal lubricant and a rust-proof pigment. The solvent thermosetting resin consists of (A) hydroxyl group-containing urethane prepolymer, and (B) at least one of block polyisocyanate compound and amino resin, which is used as a curing agent; and the hydroxyl group- containing urethane polymer is composed of (a) at least one polyol selected from the group made up of polyether polyol, polyester polyol and polyether polyester polyol, (b) isocyanate compound, and (c) dihydric alcohol. The solid internal lubricant consists of a polyethylene resin, and the content thereof is in the range of 1-30 parts by weight with respect to 100 parts by weight of a solid portion of the solvent thermosetting resin. The rust-proof pigment consists of at least one of a chromate compound and silica, and the content thereof is in the range of 3-30 parts by weight with respect to 100 parts by weight of a solid portion of the solvent thermosetting resin. <IMAGE> |
