COATED STEEL PLATE, RESIN-METAL JOINED BODY, AND METHOD FOR MANUFACTURING RESIN-METAL JOINED BODY

• Main Authors: HAYASHIDA TAKAHIDE, UEDA DAICHI
• Format: Patent
• Language: English; Japanese
• Published: 06.10.2023
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

To provide a coated steel plate which is excellent in water-resistant adhesion of a joined part to a resin composition, and scratch resistance of a coated film part, a resin-metal joined body obtained using the coated steel plate and a method for manufacturing the same.SOLUTION: There are provided a coated steel plate that has a steel plate and a coated film formed on the surface of the steel plate, wherein the coated film contains a resin containing either or both of a bisphenol type epoxy resin and a polyester resin, and a crosslinking agent containing either or both of a melamine curing agent and an isocyanate curing agent, in an IR spectrum by FT-IR of the coated film, an IR spectrum intensity ratio corresponding to an abundance ratio of a crosslinking agent having an unreacted group to a resin in the coated film is controlled within a predetermined range; and a resin-metal joined body obtained using the coated steel plate and a method for manufacturing the same.SELECTED DRAWING: None 【課題】樹脂組成物との接合部の耐水密着性及び塗膜部分の耐疵付き性に優れる塗装鋼板、並びに当該塗装鋼板を用いて得られる樹脂金属接合体及びその製造方法を提供する。【解決手段】鋼板と、鋼板の表面に形成された塗膜とを有し、塗膜が、ビスフェノール型エポキシ樹脂とポリエステル樹脂のいずれか一方又は両方を含む樹脂と、メラミン硬化剤とイソシアネート硬化剤のいずれか一方又は両方を含む架橋剤とを含み、塗膜のＦＴ－ＩＲによるＩＲスペクトルにおいて、塗膜中の樹脂に対する未反応基を有する架橋剤の存在比率に対応するＩＲスペクトル強度比が所定の範囲内に制御された塗装鋼板、並びに当該塗装鋼板を用いて得られる樹脂金属接合体及びその製造方法が提供される。【選択図】なし