| 摘要 |
PURPOSE:To enhance long-term corrosion resistance and water resistance, by applying a specific prepolymer having an inorg. filler added thereto to the surface of a steel material and subsequently applying amine-containing two-pack type reactive polyurethane heavy-duty anticorrosion paint thereto. CONSTITUTION:The anticorrosion protective paint film against a steel material or a steel structure is applied in a first and second processes. At first, in the first process, a moisture curable type primer prepared by adding an inorg. filler to an isocyanate terminal prepolymer obtained by reacting polyether polyol, polyolefin polyol and an org. isocyanate compound in a ratio of NCO/OH =1.6-3.0 is applied. Next, in the second process, polyurethane heavy-duty anticorrosion paint prepared by reacting a polyol compound wherein the concn. of hydrophilic groups composed of an ether group and a carbonyl group and the sum of a hydroxyl number and an amine value are limited and an org. polyisocyanate compound are reacted in a ratio of NCO/(OH+NH2)=0.85-1.5 is applied thereto.
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