Metal powder coating is the kind which contains metallic pigment (such as: copper gold powder, silver aluminum powder, etc.) of all kinds of powder coatings. Because of the metal powder coating be able to show a bright, luxurious decoration effect, it’s very suitable for indoor, such as furniture, accessories and car spraying outside objects. In the manufacturing process on the current domestic market mainly adopts Dry mixing method (Dry - Blending), international use (Bonding) Bonding fixed method.
First: metal powder paint coating method
Friction spray gun is generally not suitable for metal powder paint coating. In most cases, it is suggested that using electrostatic spray gun to apply half a pack. Because of the metallic pigment is contained in this type of product, while using electrostatic gun construction should ensure good grounding system, at the same time set lower electrostatic voltage and the quantity of powder, prevent to produce lighter when spraying. Form the effect of the coating and spray gun set, quality, or brand has a lot to do. There may be a lot of long time after spraying powder metal accumulation in the spray gun will place, need to be subcontracted acusector regularly cleaned.
Second:the luster of the metal powder coating
In most cases, the error is large, we do not recommend the use of gloss meter to measure the luster of the metal coating appearance, but only by visual comparison method to determine whether conform to the standard sample.
Third: the recyclability of metal powder coatings
For powder made from dry mixing method, due to occur in the process of spraying and recycling separation phenomenon, so recycling powder and new powder on metallic pigment content has certain difference, may cause the coating appearance, partial color. This is due to the nature of the differences between metallic pigment and powder particles. China epoxy resin industry association (www.epoxy-e.cn) experts recommend recycling powder and new at least for the ratio of 1:4. If using bonding fixed method to make powder coating, because the metal paint and the ratio of powder particles is relatively fixed, is completely can reuse recycle powder.
Fourth : metal powder coating finish layer
Paint again on metal powder coating spray mask layer has the following advantages: light reinforced metal powder coating stone resistance; Adding metal powder coating and beautiful effect; The erasable fall to thoroughly solve the metallic pigment; Improve the weatherability of metal powder coating. To ensure the appearance of the cover layer of light effect, required by spraying the workpiece for the first time can't get any pollution. Therefore, generally need to have full automatic spraying line and two sets of independent spray coating, respectively. Suggested that normally not spraying coat layer. Only used in very demanding, such as: high-grade electrical appliances, automobile wheel hub and outdoor use (make sure weather) etc.
Fifth: metallic pigment erasable fall
Either with bonding fixed method of dry mixing method was used to make the powder, can thoroughly solve the problem of erasable fall of metallic pigment. The only way to solve the erasable fall sex for coating on metal powder coating a layer of transparent coating.
Sixth: keep the metal powder coating appearance consistent way
1, for the same product, try to use the same metal powder coating, to avoid the difference between powder coating group asked.
2, try to maintain the stability of spraying conditions. Using the same set of spraying equipment, using the same parameters such as voltage, pressure; The distance between the gun and workpiece unchanged as far as possible, try to keep the stability of the film thickness; Ensure spraying powder coating has been fully fluidization; When using recovery powder, should guarantee the recovery powder with new powder to the less for the ratio of 1:4; Try to avoid using metal powder coating spray type complex artifacts or exist deep sag; We suggest to used to assemble together multiple artifacts should be spray at the same time.
