What are the production and processing methods of aluminum powder?

1. melt extrusion method: this method is to extrude metal pigments and other components (resin, etc.) by heating. ) powder coating. Although metal pigment and powder coating can be fully mixed, the orientation of metal pigment in high viscosity melt is insufficient. In addition, in the next crushing process, the flake structure of pigment will be inevitably destroyed. The metal powder produced by this method has a gray metal effect in the construction process. Therefore, this method is only used to make hammer grain powder.

2. Dry mixing method: This method is to add the dry powder of metal pigment into the pulverized powder coating and mix it with a mechanical mixer. The advantage of dry mixing method is that the mixing of metal pigment and powder coating is not intense, which prevents the deformation of flake metal pigment and the metal effect is not affected. In addition, the loose pigment resin mixture is also very beneficial to the orientation of metal pigments and improve the flash effect. The disadvantage of this method is that when the recovered powder is treated by automatic spraying equipment, the shape, density and charge of metal pigment and resin powder particles are very different, which leads to separation.

3. Bonding process: In this method, metal pigment and powder coating are dry mixed and heated at the same time, so that the temperature just exceeds the softening point of the resin. At this time, the metal pigment can be fixedly bonded to the surface of the viscous resin powder, thereby preventing the metal pigment and the resin powder from being separated during and after construction. This is a popular bonding method now.