Methods and precautions for coating metal powder coating

metal powder coating refers to a variety of powder coatings containing metal pigments (e.gcopper and gold powder, silver aluminum powder, etc.)Because the metal powder coating can show a bright, luxurious decorative effect, it is ideal for furniture, accessories and automotive and other indoor and external objects sprayedDry-Blending is currently used mainly in the domestic market in manufacturing processes, and bonding is also used internationally, the coating method of metal powder coating
friction spray gun is generally not suitable for the application of metal powder coatingIn most cases, it is recommended to use an electrostatic spray gun for half-packingBecause this type of product contains metal pigments, the use of electrostatic gun construction should ensure a good grounding of the system, while setting a low electrostatic voltage and powder, to prevent the spraying of fire phenomenonThe effect of forming the film has a lot to do with the setting, quality or brand of the spray gunAfter a long time of spraying, there may be a large amount of metal powder accumulated in the spray gun discharge needle, the need for the construction person to regularly clean the discharge needleii, metal powder coating glossin most cases, due to the error is very large, we do not recommend the use of gloss instrument to measure the appearance of metal coating gloss, but only the use of visual comparison method to determine whether it is consistent with the standard modelthree, metal powder coating recyclability
for powders manufactured by dry mixing method, due to the separation phenomenon in the process of spraying and recycling, so the recovery powder and new powder in the metal pigment content will have a certain difference, may lead to inconsistent appearance of the coating film, color-bias phenomenonThis is due to the difference in properties between metallic pigments and powder particlesChina Epoxy Industry Association experts recommend that the ratio of recycled powder to new powder is at least 1:4If a powder coating is used by bonding fixation, the recovered powder can be reused due to the relatively fixed ratio between the metallic pigment and the powder particlesfour, metal powder coating cover light layeron the metal powder coating coating and then spray the cover light layer has the following advantages: enhance the anti-stone strike performance of the metal powder coating film; In order to ensure the appearance of the cover layer, it is required that the first sprayed workpiece should not be subject to any contaminationTherefore, there is generally a need for a fully automated spray line and two separate spray rooms for respective coatingIt is generally recommended that you do not spray the hood light layerUse only when very demanding, such as high-end appliances, car wheels, and outdoor use (to ensure weather resistance), metal pigments can be wipable
whether it is made by dry mixing or bonding fixation, can not completely solve the metal pigment can not be wiped offThe only way to address the rewritability is to apply a transparent coating to the metal powder coatingsix, to maintain the appearance of metal powder coating sleek1, for the same product, try to use the same batch of metal powder coating, to avoid the problem of powder coating batch differencetry to keep the spray conditions stableUse the same set of spray equipment, use the same voltage, air pressure and other parameters, try to keep the distance between the spray gun and the workpiece, as far as possible to maintain the stability of the film thickness, to ensure that the powder coating before spraying has been fully flowed, when using recycled powder, the ratio of recycled powder to new powder should be reduced to 1:4, to avoid the use of metal coating powder spray type complex or the presence of deep depression of the workpiece, we recommend that the assembly of multiple workpieces should be used at the same time