[China Aluminum Industry Net] From the perspective of the future development of coatings, weatherability is an important performance indicator for aluminum alloy building profiles, but due to the differences in the environment and geographical areas in which it is used, different standards can be adopted, so that coatings can be targeted. s Choice.
Polymers based on acrylic acid and their esters have high weather resistance. This is mainly determined by monomers. It is formed by polymerization and has strong stability to light. If the monomers are properly selected, the coating will have excellent gloss retention. This resin is much better in weather resistance than the polymer formed by polycondensation. As such a coating must also have excellent corrosion resistance, the key to the formation of cross-linking of the coating film, using hexamethoxymethyl melamine as a cross-linking agent, in the film curing process has a good cross-linking The coating has high hardness, gloss, color (no yellowing) and excellent weatherability. In recent years, the emergence of cathodic electrophoretic coatings with better lightfastness is also a good choice, and its corrosion resistance is better. It is a polyamine resin structure and is made of IPDI (isophorone isocyanate) or aliphatic isocyanate. The resulting crosslinker has excellent weather resistance and can be made into CED. With CED, it is not necessary to use aluminum alloy oxidation, because in the electrodeposition process, the electrophoretic behavior is toward the cathode, the oxide film will be partially destroyed or completely destroyed, but this coating still has excellent corrosion resistance and weather resistance, there are many People think this should be the development trend in the field of architecture.
With regard to the coating process, the use of electrodeposition method is an ideal method, which is advantageous to automated production with high efficiency. The utilization rate of the coating is as high as 95% (Aluminum anodic electrophoretic coating produced in China is generally 82%. The decrease in the efficiency is mainly related to the viscosity of the coating solution. And the anti-interference performance), the production of relatively stable quality coating film is formed by ED, the process is under the action of electric field force, first in the current density of high-site coating, the formation of film resistance becomes larger, but not formed The neighboring part becomes a part where the current density is high and the coating is continued, so that high resistance is formed in all parts of the workpiece. When the ED is extended, the coating film will not be thickened any longer. For the geometrically complex shapes, the profiles can be The coating film having a uniform film thickness at the site is called the ED's penetration rate performance, and is excellent in corrosion resistance, and also improves the weather resistance.
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