MDF POWDER COATING
Powder coating of products has already proven itself as an innovative, waste-free and eco-friendly technology for producing decorative coatings. Thanks to the powder, the surface is long-living and resistant to various negative influences.
About 80% of the powder paint is used for painting various metal surfaces
But this area is successfully developing. Already, powder paint can be applied to MDF with excellent coverage.
Today we will tell about the advantages of MDF powder coating and how the paint can be applied on this material.
Advantages of powder coating of MDF
Due to the properties of powder paint, applying it on MDF greatly increases the life of these panels. This is probably the main advantage of MDF powder coating. But not the only one.
MDF powder coating has a more uniform coating than liquid paint.
The powder lies perfectly on profiled, embossed and milled surfaces. It perfectly covers sharp corners and oblique sections. This means that there are new opportunities for designers.
Thanks to the presence of various structures of paints, it is possible to realize absolutely any decisions.
Edging materials are not required for edge trim. That is, no gaps accumulate between the edge and the plate in which dirt accumulates.
Another important advantage of MDF powder coating is the economy of the paint and the absolute safety of operation.
Problems of MDF coating
Painters who cover MDF with powder paint can have several problems.
First: the low thermal conductivity of the panels compared to the metal surfaces.
Second: gases are created on the surface of the MDF, which create defects in the coating. This is because the MDF is characterized by high humidity and the polymerization of the paint requires a temperature of 150 ° C to 200-220 ° C.
Third: due to the peculiarities of the structure of the material, there is no smooth coating.
Methods of powder coating of MDF
The first method of painting panels is preheating.
MDF is placed in an drying or polymerization furnace for 20 minutes at 80-120 ° C. Immediately afterwards, the panel is suspended in a dye furnace and applied with powder. Next, the painted panel is sent to the polymerization furnace for 10 minutes at 150 ° C.
Due to warming powder paint settles better on the surface. This results in a much better and smoother finish.
The second method of MDF coating is the preliminary application of primers (soil solutions) to the surface. Thanks to a special primer based on conductive substances, powder paint fits well on the surface.
A primer is applied to the panel. After applying the primer, it should be left for a while until it is completely dry.
The treated and dried panel is placed in the painting chamber and applied to the paint. The MDF is then sent to the polymerization furnace for 10 minutes at 150°C.
Both methods help to avoid degassing on the surface of the panels.
For details on both methods of applying powder paint on MDF, see the "Technologist's Diary". Lakover technologist Oles Lastivka shows step by step both methods of MDF preparation and compares the result.