| 摘要 |
PROBLEM TO BE SOLVED: To improve the anti-hot water adhesiveness, anti-high temperature cathode peeling properties and low temperature impact resistance by laminating an epoxy primer layer containing a specific essential component, a polyolefin adhesive layer and a polyolefin layer in that order on the surface of a steel material. SOLUTION: A powder epoxy primer layer 3, a modified polyolefin adhesive layer 4 and a polyolefin layer 5 are laminated sequentially on the surface of a steel material 1 treated with a primer coat. Powder epoxy primer contains the underdescribed four essential components (A), (B), (C), (D).(A) is a mixture of a bisphenol A-type epoxy resin with 75-128 deg.C softening point and an o-cresol nonvolac-type epoxy resin, (B) is a phenolic curing agent represented by the formula (m is 1-4), (C) is an imidazole curing promoter and (or) an imidazoline curing promoter and (D) is an inorganic filler. Besides, in order to impart a further outstanding corrosionproofness, a chromate coat 2 is formed. |
