| Based on the characteristics of power plant flue gas after wet flue gas desulphurization system and the present corrosion situation of chimney, the new anticorrosion coating for power station chimney after desulphurization was researched in order to develop a new anticorrosion coating. Polyurethane was chemically modified by silane coupling agent, which got five kinds of polyurethanes modified. Organic silicon low polymer was synthesized by silane coupling agent, FTIR showed that the synthesis was successful. Polyurethane was chemically modified by organic silicon low polymer, which got four kinds of polyurethanes modified. FTIR indicated that the two chemically modifies was successful. In order to verify the corrosion resistance of the coating, used modified polyurethane to make anticorrosion coating sample, prepared simulation condensed sulfuric acid in chimney, carried on anti-acid experiment and Machu experiment, the anti-corrosion property of modified polyurethane was studied. The experiments indicated that the anti-acid property and the adhesion of the polyurethane modified by silane coupling agent coating was better than unmodified polyurethane coating, and the fifth modified polyurethane had the best anti-corrosion property; the anti-acid property and the adhesion of the polyurethane modified by organic silicon low polymer coating was better than unmodified polyurethane coating, and the forth modified polyurethane had the best anti-corrosion property. The results of thermo-gravimetric analysis showed that the heat-resisting of polyurethane modified by silane coupling agent had no linear relation with the quality of silane coupling agent, but to polyurethane modified by organic silicon low polymer, the chemically modify was useful for the increase of the heat-resisting of polyurethane. The conclusion can provide important reference and foundation to chimney anticorrosion technology after wet flue gas system. |
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