Color-Coated Coil
Color-coated coil, also known as color-coated steel coil, is a composite material with excellent decorative properties and corrosion resistance.
Definition and Composition: Color-coated coil is made from cold-rolled steel sheets, galvanized steel sheets, or other substrates. After surface pretreatment, including degreasing, cleaning, and chemical conversion, it is coated with one or more layers of organic coating via continuous roller coating and finally cured by baking. Its structure typically includes a substrate, an optional coating, a chemical conversion layer, and the coating.
Substrate Classifications
Hot-dip galvanized substrate: This is achieved by immersing thin steel sheets in a bath of molten zinc, depositing a layer of zinc on the surface. In addition to the protective properties of zinc, the organic coating on the surface of hot-dip galvanized color-coated steel sheets also provides insulation and rust resistance, resulting in a longer service life than hot-dip galvanized steel sheets. The zinc content of hot-dip galvanized substrates is generally 180g/m² (both sides).
Hot-dip galvanized substrate: This substrate is made from hot-dip galvanized steel sheets (55% Al-Zn), typically with an aluminum-zinc content of 150g/m² (both sides). Its corrosion resistance is 2-5 times that of hot-dip galvanized sheet, and it exhibits excellent heat reflectivity, making it an ideal energy-saving building material.
Electrogalvanized substrate: Electrogalvanized sheet is coated with an organic coating and then baked. Due to its thin zinc layer, typically containing 20/20g/m², it is not suitable for outdoor use in walls and roofs. It is primarily used in home appliances, audio equipment, steel furniture, and interior decoration.
Coating Types
Ordinary Polyester (PE): Offers excellent adhesion, rich colors, easy processing, and low cost. Under normal conditions, it has a service life of 7-10 years and is suitable for areas with moderate air pollution.
Silicon-modified Polyester (SMP): Utilizing a special silicone resin, it enhances the coating's wear resistance and metal scratch resistance, making the coating harder, durable, and resistant to chalking. It offers a moderate cost and a service life of 12-15 years under normal conditions. It is primarily used for building roofs and exterior walls. High-durability polyester (HDP): A high-molecular-weight polymer composed of a special combination of polyacids and polyols. It is almost completely transparent to UV light, improving the coating's gloss retention and resistance to chalking. It is also resistant to photolysis, offers excellent film adhesion, and offers a high cost-effectiveness. Under normal conditions, it has a service life warranty of over 15 years.
Polyvinylidene fluoride (PVDF): The pinnacle of existing architectural coatings, it offers exceptional stability, unique resistance to UV photolysis and chemical resistance, as well as excellent insulation and mechanical properties. It has a service life warranty of over 20 years.
Coating structures: There are three main coating types: 2/1, 2/1M, and 2/2. 2/1 refers to two coats on the top surface and one coat on the bottom surface, followed by a double bake. It is primarily used for sandwich panels. 2/1M refers to two coats on each of the top and bottom surfaces, followed by a single bake. It is suitable for single-layer laminated panels and sandwich panels. 2/2 refers to two coats on each of the top and bottom surfaces, followed by a double bake. It is primarily used for single-layer laminated panels. Product Features: Featuring rich colors and an attractive appearance, it also offers excellent corrosion resistance, effectively resisting the elements and extending its service life. Furthermore, color-coated coils are lightweight, high-strength, easy to transport and install, and possess excellent processability, adapting to a wide range of complex architectural designs and construction requirements.
Main Applications: Widely used in advertising, construction, home appliances, electrical appliances, furniture, and transportation. For example, in construction, it can be used for roofs and walls; in the home appliance industry, it can be used for refrigerator and air conditioner housings; and in the advertising industry, it can be used to create billboards and signage.
