Development Of New Water - Based Metal Anticorrosion Coatings

Water-based metal anti-corrosion coatings is a kind of environmental friendly coating which is still in development, and it has been applied in many fields. In recent years, the requirements for waterborne metal anticorrosive coatings are more and more strict, in addition to anticorrosion, many areas still need the performance of the conducting electrostatic, which request for more higher performance on waterborne metal anticorrosive coatings. This work studies the preparation of the high performance water-based metal anti-corrosion baking paint and the room temperature curing waterborne anticorrosive conducting electrostatic coating, and the factors which affect the properties of coating were also investigated.1/Waterborne epoxy modified acrylic resin as film forming material (part A), based on the types of amino resin (part B)、ratio of AB、the kinds and dosage of catalyst、and corrosion resistant fillers contrast experiment was carried out. IR, water absorption test, test the degree of crosslinking, acetone resistance testing, mechanical testing and resistance to corrosive media performance testing and other test means of corrosion resistance of the coating were carried out to characterize the properties of the coating, and the results show that ester amino resin using RS717, catalyst selection enclosed sulfonic acid phosphorus amine2050w, anticorrosion filling zinc phosphate, and the ratio of A and B of2.5:1, dosage of catalyst was0.5%, the preparation of the coating can be rapidly solidified under120℃, the coating is smooth and has excellent anticorrosion performance.2、For such factors as membrane material of water-based metal anti-corrosion conducting electrostatic coating, the type and content of conductive fillers, carbon nanotube modified purification, the amount of carbon nanotubes, and carbon nanotubes and other conductive fillers comparative study, the waterborne anticorrosive antistatic coating was prepared, and Through such means as infrared spectrum, scanning electron microscopy (SEM), polarizing microscope, surface resistivity testing, mechanical performance testing and medium resistance testing, the coating performance were characterized. The research results show that using5%hydrofluoric acid and5%of the mixture of nitric acid purification method can improve the surface characteristics of carbon nanotubes, and introduce more on carbon nanotubes reactive group-OH, use BYK-154to modify the purified carbon nanotubes to improve the dispersion of carbon nanotubes in coatings. When the purification of modified carbon nanotube content is0.2%, conductive barium sulfate content was19.8%, the surface resistivity of the Water metal corrosion of conducting electrostatic coating is on the order of106Ω, and the resistance in5%H2SO4can reach more than15d,3%NaCl solution15d, and5%NaOH solution more than30d.3-. Using the method of seed emulsion to prepare the phosphate ester and epoxy modified acrylate latex (EPA), and then the phosphate on the EPA latex as acid doped functional groups, polyaniline was synthesized, then different content of polyaniline of PANI-EPA latex were made, solving the non-uniform dispersion problem of polyaniline in the paint, using this latex, the waterborne polyaniline anticorrosive static conductive coating was prepared. By differential scanning calorimetry (DSC)、surface resistivity test、open circuit potential (OCP) test、 mechanical testing mechanical properties, resistance to media performance testing, water absorption test and other test methods, the performance of the coating were characterized. The results showed that when the polyaniline content is2%, the surface resistivity of the coating can reach106Ω at minimum, at the same time, medium resistance achieve the best.