Prepainted steel coils are more and more widely used in industry and construction. What are the points to pay attention to in these applications?
1. Different primers have certain differences in adhesion, toughness and corrosion resistance. Epoxy has good adhesion to the substrate and high corrosion resistance, but the toughness is not as good as other primers. Polyester has good adhesion to the substrate and excellent toughness, but its corrosion resistance is not as good as epoxy. Polyurethane is a primer with good overall performance. The primer is usually selected by the supplier according to the production process, use, corrosiveness of the use environment, and matching relationship with the topcoat.
2. Corrosion resistance usually increases with the increase of coating thickness. When ordering, the coating thickness should be determined according to the corrosiveness, service life, durability and other factors of the use environment.
3. Different types of topcoats have differences in hardness, flexibility, adhesion, durability, etc. Polyester is currently the most widely used paint, with average durability, good hardness and toughness, and moderate price. Silicon-modified polyester has high durability, gloss and color retention, but slightly reduced toughness, and high weather resistance polyester has a higher cost performance. Polyvinylidene fluoride has excellent durability, good toughness, but low hardness, few colors available, and high price. The topcoat of the prepainted steel coils is mainly affected by the purpose, the corrosiveness of the use environment, the service life, the durability, the processing method, and the degree of deformation.
The above are the points that need to be paid attention to in the application of prepainted steel coils. Did you know? If you are interested in prepainted steel coils products, please feel free to contact us.
