Color-coated coils are based on hot-dip galvanized sheets, hot-dip galvanized sheets, electro-galvanized sheets, etc. After surface pretreatment (chemical degreasing and chemical conversion treatment), one or several layers of organic paint are applied to the surface, and then After baking and curing products. It is named after the colored steel coil coated with organic coatings of various colors, referred to as color coated coil.
Color-coated rolls have light weight, beautiful appearance and good corrosion resistance, and can be directly processed. The colors are generally divided into gray, navy, and brick red. They are mainly used in advertising, construction, home appliances, electrical appliances, furniture, and transportation. industry.
The paint used for color-coated rolls should be selected from suitable resins according to the use environment, such as polyester silicon modified polyester, polyvinyl chloride plastisol, polyvinylidene chloride, etc. The user can choose according to the purpose.
Color coated roll substrate classification:
Hot-dip galvanized substrate
The product obtained by coating the organic paint on the hot-dip galvanized steel sheet is the hot-dip galvanized color-coated sheet. In addition to the protective effect of zinc, the hot-dip galvanized color-coated sheet also has an organic coating on the surface to protect and prevent rust, and has a longer service life than hot-dip galvanized sheet. The zinc content of the hot-dip galvanized substrate is generally 180g/m2 (double-sided), and the maximum zinc content of the hot-dip galvanized substrate for building exterior is 275g/m2.
Hot-dip aluminum-zinc substrate
Hot-dip aluminum-zinc steel (55% Al-Zn) is used as the newly coated substrate, usually containing 150g/㎡(double-sided) of aluminum and zinc. The corrosion resistance of hot-dip galvanized sheet is 2-5 times that of hot-dip galvanized sheet. Continuous or intermittent use at temperatures as high as 490°C will not cause serious oxidation or scale formation. The ability to reflect heat and light is twice that of hot-dip galvanized steel, and the reflectivity is greater than 0.75, which is an ideal building material for energy saving.
Electro-galvanized substrate
Using electro-galvanized sheet as the substrate, coated with organic paint, the product obtained by baking is electro-galvanized color-coated sheet. Because the zinc layer of electro-galvanized sheet is thin, the zinc content is usually 20/20g/m2, so this product is not suitable for use Make walls, roofs, etc. outdoors. But because of its beautiful appearance and excellent processing performance, it can be mainly used for home appliances, audio, steel furniture, interior decoration, etc.
Coating types of pre-painted coils:
Polyester (PE)
Good adhesion, rich colors, wide range in formability and outdoor durability, moderate chemical resistance, and low cost.
Silicon modified polyester
That is (SMP), the hardness of the coating film, abrasion resistance and heat resistance are good, as well as good external durability and chalking resistance, gloss retention, flexibility, and medium cost.
High durability polyester
Namely (HDP), excellent color retention and UV resistance, excellent outdoor durability and chalking resistance, good paint film adhesion, rich colors, and excellent cost performance.
Polyvinylidene fluoride
Namely (PVDF), excellent color retention and UV resistance, excellent outdoor durability and chalking resistance, excellent solvent resistance, good moldability, dirt resistance, limited color and high cost.
Previous:Bending Machines