Many people in the purchase of color coated board, do not know the real good color coated board and poor color coated board specific difference, because the surface is similar, and not used for a period of time will not be a problem. There are many factors
to be considered in the selection of coating, including coating type, coating thickness, coating color and coating gloss. In addition, the requirements of primer and back coating of coating should be considered sometimes. At present, the coatings
used for color coated steel plate include polyester coating (PE), fluorocarbon coating (PVDF), silicon modified coating (SMP), high weather resistant coating (HDP), acrylic acid coating, polyurethane coating (PU), plastic sol coating (PVC), etc.
01 common coating types
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Polyester (PE, polyester)
PE coating has good adhesion to materials, color coated steel plate is easy to process and shape, low price and many
products, and there is a wide choice of color and luster. Polyester coating is not ideal for UV resistance and powdering resistance of film. Therefore, the use of PE coating still needs to be restricted. It is generally used in areas where air pollution
is not serious or products that need to be molded for many times.
Ordinary industrial plants and warehouses and warehouses are not corrosive to the color boards themselves, and the requirements for corrosion resistance
and aging resistance of color boards are not high. More consideration is given to the practicability and cost performance of factory buildings.
Silicon modified polyester (SMP)
Because polyester contains active group - OH / - COOH, it is easy
to react with other macromolecules and substances. In order to improve the sunlight resistance and powdering property of PE, silicone resin with excellent color retention and heat resistance is used for denaturation reaction, and the denaturation ratio
of PE can be between 5% - 50%. SMP provides better durability of steel plate, and its anti-corrosion life can be as long as 10-12 years. Of course, its price is higher than that of PE The adhesion and processability of e resin to the material are not
ideal. Therefore, SMP color coated steel sheet is not suitable for the occasions requiring multiple molding and processing, and most of them are used for building roofs and external walls.