Summary of methods to improve the powder loading rate of powder coating

1 Control the particle size distribution of the powder, the narrower the better: reasonable control of the particle size of the powder (relatively difficult) in our actual production only adjust the speed of the main and secondary grinding of ACM The powder size of 40 - 50um is suitable, and the narrow distribution is better 2 Improve the resin content: increase the resin content, reduce the filler content, select the resin with good electrical performance, epoxy is better for powder application, some manufacturers can't use polyester powder, some manufacturers can't use polyester powder, some manufacturers can use polyester powder (grind epoxy and polyester into powder spray plate separately), the spray level of the friction spray gun is obviously better than that of the electrostatic gun, and the friction gun can spray a thicker coating without high pressure The disadvantages of the gun are like big orange peel 3 Reasonable selection of fillers: fineness and dispersion of fillers are closely related to powder loading The precipitated powder is higher than the general superfine heavy barium, and the barium sulfate is better than the calcium carbonate 2 Adding the electric assistant: adding the conductive assistant in the formula (mechanism: it can make the powder particles carry more charges There is a strong electric field in the area from the high-voltage electrostatic spray gun to the workpiece, and the air is ionized to produce hundreds of millions of ions When the powder particles of the electrostatics pass through this area, they are polarized, which can catch more negative ions and carry more charges Due to the weak power line of Faraday effect, the powder particles with more charges can reach the surface of the workpiece by their own force, so as to improve the powder loading of these parts "