Preparation Of Organic Silicon And Epoxy Resin Modified Polyurethanc Zinc-rich Anti-corrosion Coating

In recent years, as the phenomena of material corrosion is more and more serious, more andmore attention are paid for the corrosion protection. Therefore, this subject committed todevelop organic silicon and epoxy resin modified polyurethane Zinc-rich anti-corrosion coatingwhich is used for corrosion protection. The experiment’s best ratio of polyurethane prepolymeris decided by the changes of n（-NCO）/n（-OH） in the proportion. And the best scheme of siliconeand epoxy resin modified polyurethane is determined by the single factor experiment andorthogonal experiment. And then test chemical corrosion resistance of coatings with differentzinc content, Preparing the final organic silicon and epoxy resin modified polyurethane Zinc-richanti-corrosion coating. Finally, the water absorption, impact strength, tensile strength, adhesion,corrosion resistance are tested. And polarization curves, infrared spectroscopy, scanning electronmicroscopy and thermogravimetric analysis are analyzed.The results show that: the optimum process conditions of organic silicon and epoxy resinmodified polyurethane Zinc-rich anti-corrosion coating are n（-NCO）/n（-OH）=2:1, the content oforganic silicon is8%, including epoxy resin5%, chain extension agent3%, crosslinking agent2%, plasticizer2%, nano SiO₂4%, nano TiO₂2%, the mass fraction of zinc is83%, the responsetime is60min, the reaction temperature is85℃. Developed coating has high mechanicalstrength, good adhesion, low water absorption rate, good thermal stability and corrosionresistance.