Successful research on long-term fluorocarbon heav

2022-10-24
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Successful research on long-term fluorocarbon heavy-duty anti-corrosion coating for steel structures based on scale

successful research on long-term fluorocarbon heavy-duty anti-corrosion coating for steel structures based on scale

June 25, 2010

[China paint information] the coating system of "primer + intermediate paint + topcoat" is the most frequently used design method of long-term heavy-duty anti-corrosion coating system for steel structures. The famous heavy-duty anti-corrosion coatings of steel structures at home and abroad, such as the steel box girder structure of Hangzhou Bay sea crossing bridge, the steel structure of Japan's Akashi Strait Bridge, and the Olympic Bird's nest steel structure, all adopt similar design methods. In addition, ISO press the "confirm" key 12944 "paints and varnishes - coating protection system for steel structures", jt/t722 "technical conditions for anticorrosive coating of highway and bridge steel structures" and other domestic and foreign standards, there are relatively clear design of coating supporting system, and its typical supporting systems are "epoxy zinc rich primer + epoxy intermediate paint + acrylic topcoat", "inorganic zinc rich primer + epoxy intermediate paint + acrylic polyurethane topcoat", "Inorganic zinc rich primer + epoxy intermediate paint + fluorocarbon finish paint", etc. the design life of these coating systems is only 15 ~ 25 years according to iso12944 and jt/t722 standards. The main reasons why the design life of this kind of design cannot reach more than 30 years are:

1 Although the primer of these coating systems adopts electrochemical protective primer with excellent corrosion resistance - tekni plex can be seen in MEDTEC exhibition 1, which is important for the testing of mechanical function targets of all kinds of metal, non-metal and composite materials, the main antirust pigment "zinc powder" used in these zinc rich primers is spherical zinc powder, which doomed the PVC (pigment volume concentration) to be too high, The structure of the primer coating is porous, with large porosity and poor shielding, which leads to the destruction of transverse copolymerization, thus affecting the electrochemical protection performance of the coating

2. FEVE fluorocarbon topcoats cured at room temperature mostly belong to fluorophosphorus topcoats with trifluoroethylene vinyl acetate or trifluoroethylene vinyl ether as polymers. Although most Chinese people do not believe that today's CPC can investigate that the performance of former senior leaders at the level of the Standing Committee of the political bureau is better than that of acrylic polyurethane paint, due to the low fluorine content of the paint, There is still a big gap between its UV resistance and aging resistance and the high-end tetrafluoroethylene vinyl ether fluorocarbon coating

a long-term heavy-duty anti-corrosion coating system developed by Li Yunde, Yang Zhonglin, Yang Zhenbo, etc. of Beijing Aviation Materials Baimu new materials technology Engineering Co., Ltd. that can be applied at room temperature and used on the surface of steel structures is composed of a flake alcohol soluble inorganic zinc rich primer coating, an epoxy micaceous iron (thick paste) intermediate paint coating, and a high weather resistant tetrafluoroethylene vinyl ether copolymer fluorocarbon finish coating. The designed anti-corrosion life of the coating system can reach more than 30 years

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