Painted aluminum sheets manufacturer know the specific difference between high-quality color coated aluminum and inferior color-coated aluminum. Although the surfaces of different brand painted aluminum sheet are the same at one sight, and there will be no problems if they are not used for a period of time. There are many factors to be considered for the choice of buying color painted aluminum sheets, which mainly include the type of coating, the thickness of the coating, the color of the coating and the gloss of the coating. In addition, sometimes the requirements for primer and backside coating of the paint must be considered.
The types of coatings currently used in painted aluminum sheets manufacturer include polyester coating (PE), fluorocarbon coating (PVDF), silicon modified coating (SMP), high weather resistance coating (HDP), acrylic coating, Polyurethane coating (PU), plastisol coating (PVC), etc. PE coating has good adhesion to the aluminum sheet material, the color coated aluminum sheet is easy to process and shape, the price is low, the product is many, and the choice of color and gloss is large. Polyester coatings are not ideal for UV resistance and chalking resistance of the coating film. Therefore, the use of PE coatings still needs to be subject to some restrictions. It is generally used in areas with less air pollution or products that require multiple molding processes. Applicable industry of PE painted aluminum sheets are ordinary industrial plants and warehousing and logistics warehouses do not corrode the color plates themselves, and do not require high corrosion resistance and aging resistance of the color plates. More consideration is given to the practicability and cost-effectiveness of plant construction.
Due to the strong bond energy between the chemical bond and the chemical bond of PVDF, the coating has very good corrosion resistance and color retention. Among the painted aluminum sheets manufacturer color coated aluminum sheet coatings for the construction industry, it is the most advanced product with a large molecular weight. Straight bond structure, so in addition to chemical resistance, mechanical properties, UV resistance and heat resistance are also outstanding. Under normal circumstances, its anti-corrosion period can be as long as 20-25 years. In recent years, fluorine-containing resins copolymerized with chlorotrifluoroethylene and vinyl ester monomers have become popular in China, and they are widely used in building exterior walls and metal panels. Due to the use of easily hydrolyzed vinyl ester monomers and the content of fluorine is 30% lower than that of PVDF %, so there is a certain gap between its weather resistance and PVDF. For the fluorocarbon coating produced by Baosteel, the PVDF content of the coating is not less than 70% (others are acrylic resin).