[China Aluminum Network] 1, melt extrusion
In this method, the metal pigment and the remaining components (resin, etc.) of the powder coating are heated and extruded through a screw extruder. Although the metal pigment and the powder coating can be sufficiently mixed, the metal pigment is insufficiently oriented in the high-viscosity melt. In addition, in the next crushing process, the sheet structure of the pigment is inevitably destroyed. The metal powder produced by this method has a gray metallic effect during construction. Therefore, this method is only used for the production of hammer powder.
2, dry mixing method
The method is to add the dry powder of metal pigment into the crushed powder coating and mix it with a mechanical mixer. The advantage of the dry blending method is that the metal pigment and the powder coating are not very intense when mixed, thereby preventing the deformation of the sheet metal pigment and the metal effect is not affected either. In addition, loose pigment/resin blends are also very beneficial to the orientation of metallic pigments and improve the glittering effect. The disadvantage of this method is that when an automatic spray apparatus is used to treat the recovered powder, the separation phenomenon occurs due to the large difference in shape, density, and charged charge between the metal pigment and the resin powder particles.
3, bonding method (Bonding-Process)
In this method, the metallic pigment and the powder coating are dry-blended while being heated at the same time so that the temperature just exceeds the softening point of the resin. At this point, the metallic pigment can be fixed and adhered to the surface of the viscous resin powder, thereby preventing the powder from being applied. The separation of metal pigments from resin powders after recovery from neutralization. It is now the popular law of bonding.
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