Metal powder coatings are those containing metallic pigments: various powder coatings (such as copper powder, silver, aluminum, etc.). Since the metal powder coatings can show a bright and luxurious decorative effect, very suitable for indoor spraying furniture, jewelry and automobiles outside objects. In the manufacturing process the domestic market mainly dry mixing method (Dry-Blending), also using adhesive fixation (Bonding) internationally.
A metallic powder coating method of coating
Tribo gun is generally not suitable for coating a metal powder coating. In most cases, we recommend using an electrostatic spray gun semi-Coating. Because this type of product containing a metallic pigment, an electrostatic gun construction should be well grounded in the guarantee system, while setting a low electrostatic voltage and the amount of powder, to prevent ignition phenomena during spraying. The effect of forming a coating film with the gun set, quality or brand has a great relationship. There may be a lot of metal powder in the gun discharge needle accumulate at those who need to regularly clean the discharge needle construction after prolonged spraying.
Second, the metal powder paint Gloss
In most cases, because the error is large, we do not recommend the use of shiny metallic appearance of the coating film was measured gloss, but only by visual comparison method to determine whether the agreement with the standard model.
Third, the metal powder coating recyclability
For manufacturing dry mix powder method, since the separation occurs in the spray and recovery process, thus recovering powder and new powder will be some differences in the metal pigment content, appearance of the coating may cause inconsistent color cast phenomenon . This is due to the nature of the difference between the metallic pigment and powder particles of the decision. China Epoxy Resin Industry Association (www.epoxy-e.cn) experts recommend powder and new powder recovery ratio of at least 1: 4. If you use a fixed method of manufacturing adhesive powder coatings, due to the relatively fixed ratio between the metallic pigment and powder particles, you can re-use of recycled powder.
Fourth, the metal powder coating varnish layer
The metal powder coating then spray varnish layer has the following advantages: enhance the anti-stoning properties of the metal powder coating; increase the aesthetic effect of metal powder coating; completely solve the metallic pigment can rub off resistance; improve the metal powder coating weatherability. To ensure the appearance of the varnish layer is required after the first spraying of the workpiece can not be subject to any pollution. Thus, the general need to have a fully automated spray lines and two separate paint spray booth separately. Under normal circumstances we do not recommend spraying varnish layer. Only when the requirements are very high, such as: high-end appliances, automobile wheels and outdoor use (ensure weather resistance) and the like.
Fifth, the metallic pigment may rub off sex
Whether it is a dry powder mixing method or adhesive fixing method of manufacturing, have not completely solve the metallic pigment may rub off problems. The only way of solving can rub off a layer of clear coat is sprayed on the metal powder coating.
Sixth, to maintain the appearance of the metal powder coating coherent approach
1, for the same product, try using the same batch of metal powder coating, to avoid the difference between asking powder coating batches.
2, try to maintain a stable spray conditions. Use the same set of spray equipment, using the same voltage, pressure and other parameters; try to keep the gun and the workpiece constant distance, try to maintain the stability of the film thickness; ensure before spraying the powder coating has fully fluidizing; when using recycled powder should ensure recovery the ratio of powder and new powder to at least 1: 4; try to avoid the use of metal powder coating complex shape of the workpiece or deep depressions exist; we recommend for a plurality of workpieces to be assembled together while spraying.