"Primer + intermediate + finish" coating system design approach is a long-term heavy-duty steel coating system most frequently used. Famous heavy steel anti-corrosion coating, such as the Hangzhou Bay Bridge steel box girder, steel Japan Akashi Strait Bridge, the Olympic Bird's Nest steel are measured using a similar design. And ISO12944 "Paints and varnishes - Coating Steel protection systems", JT / T722 "highway bridge steel corrosion coating technology" and other international standards, there is a more clear coat matching system design, typical supporting system of "epoxy zinc-rich primer + paint + epoxy intermediate acrylic topcoat," "intermediate inorganic zinc-rich epoxy primer + paint + acrylic polyurethane finish", "inorganic zinc-rich primer + epoxy intermediate coat + fluorocarbon finish "and so on, the design life of these coating systems in accordance with ISO12944 and JT / T722 and other standards, only 15 to 25-year design life. The class is designed to achieve the design life of 30 years can not be the main reason:
1 primer coating system although the use of these excellent corrosion resistance of electrochemical protection primer - zinc-rich primer, but these are mainly used in anti-rust paint zinc-rich primer "zinc" are spherical zinc dust doomed PVC (pigment volume concentration) is too high, the primer coating was porous structure, porosity, large, barrier property, causing damage to the lateral copolymer, thus affecting the performance of electrochemical protection coating;
2 room temperature curing FEVE fluorocarbon finish used mostly belonging to chlorotrifluoroethylene - vinyl acetate or chlorotrifluoroethylene - vinyl ether polymer fluoride phosphate finish, good corrosion resistance although its performance than acrylic polyurethane coatings but due to the low amount of fluorine coating, which is resistant to UV aging resistance and high tetrafluoroethylene - fluorocarbon vinyl ether paint is still a big gap.
One kind by the Beijing Air Materiel Biam new materials technology Engineering AG Liyun De, Yang Zhonglin, Yang Zhenbo such as the development of the construction may at room temperature for long-term heavy-duty steel surface coating systems by the alcohol-soluble inorganic zinc flake primer coating, epoxy micaceous iron oxide (thick paste) intermediate lacquer coating, high weather tetrafluoroethylene - fluorocarbon finish vinyl ether copolymer coating composition. The anti-corrosion coating system design life can reach more than 30 years.
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