(1) Polyester resin (PE). It is a conventional topcoat system, this kind of resin is not affected by fatty acid, and is superior in characteristics. The coating has good flexibility, adhesion and processability. However, PE coating is not ideal for sunlight
resistance and film pulverization, so the use of PE coating still needs to be limited. It is generally used in areas with less serious air pollution, and its service life is relatively reduced in industrial environment or areas with serious pollution.
The general service life is 8-10 years.
(2) High performance polyester (HDP). It is modified from polyester resin (PE). Because the polyester resin (PE) contains active group - OH / COOH, it is easy to react with other high molecular compounds. In order to improve the sunlight resistance and pulverization of PE, it is denatured with the resin with good color retention and heat resistance, and HDP is synthesized. HDP can provide better durability and outdoor weather resistance for steel plate, It can also prolong the anti-corrosion life. HDP resin coating system can avoid cracking, peeling or loosening in 10-15 years under the condition of outdoor conventional climate and proper rainfall washing.
(3) Polydifluoroethylene resin (PVDF). Polydifluoroethylene resin coating is the most excellent system in the coil coating system in the world at present, and it is also the most advanced product in the construction industry. Due to the strong bonding force between PVDF chemical bond and academic bond, the coating has very good corrosion resistance and color retention, and its weatherability (light retention, pulverization resistance and color durability) is also the best among all coating systems. PVDF molecular weight and direct bond structure, so in addition to excellent resistance to chemicals, it has excellent mechanical properties, UV resistance and heat resistance. The polydifluoroethylene resin coating system can be washed in normal outdoor climate and proper rainfall, and the paint layer will not crack, peel or loosen within 20 days.