Dry-Blended and Bonded Metallic Powder Coating
Posted by: doPowder | on May 12, 2022
Metallic powder coating refers to various powder coatings containing metal pigments (such as copper gold powder, aluminum powder, pearl powder, etc.). In the manufacturing process, the domestic market mainly adopts the Dry-Blended method and the bonded method.
The biggest problem with dry-blended metal powder is that the dropped powder cannot be recycled. The powder application rate is low, and the products sprayed from the same batch are inconsistent in color, and the risk is high! Moreover, the color difference between large batches of flash silver powder is huge.
Metallic and mica powder coating contains metal flake or mica particulate matter that gives these coatings their special appearance. These flakes and particulars are a freestanding component. Metallic powder coating is homogeneously blended with a base color powder and are referred to as Dry-Blended powders. They are available in Epoxy, Hybrid, Urethane, and TGIC Polyester chemistries.
The problems faced with dry-blended powder coating are with color consistency, limited penetration in recessed areas, and their limited ability to be recycled. Dry-blended powder coating are usually applied using a corona gun with a flat spray nozzle. Metallic and mica powder coating are processed by physically bonding them to the surface of the powered coating. Generally, all of the metallic or mica particles are bonded, however some may not be firmly attached and can cause various problems in the finishing process
Bonded metallic powder coating and mica powder has fewer lines than dry blended powder coating and are more readily recyclable. In addition, they also provide color that is more consistent after recycling and less picture frame effect, as well as a better penetration and higher transfer efficiency. Even though bonded metallic and mica powder can be reclaimed, it is always best to minimize the ration of reclaimed powder to virgin powder so that you will produce the best possible finish. Bonded powder coating is available in Epoxy, Hybrid, Urethane, and TGIC polyester chemistries.