Brief introduction to the production and processing methods of aluminum powder
Brief introduction to the production and processing methods of aluminium powder
1, melting extrusion method: this method is the metal pigment and the rest of the powder coating components (resin, etc.) through the screw extruder heating extrusion. Although metallic pigments and powder coatings are well mixed, metallic pigments are poorly oriented in high viscosity melts. In addition, in the next crushing process, the flake structure of the pigment will inevitably be destroyed. The metal powder produced by this method has grey effect in construction. Therefore, this method is only used for the production of hammered aluminum powder.
2, dry mixing method: this method is the metal pigment powder into the powder coating has been crushed by mechanical mixer mixing. The advantage of dry mixing method is that the mixture of metallic pigment and powder coating is not very intense, so as to prevent the deformation of flake metallic pigment and the metal effect will not be affected. In addition, loose pigment/resin mixture is also very conducive to the orientation of metallic pigments, improve the flash effect. The disadvantage of this method is that when the powder is recovered by automatic spraying equipment, the shape, density and charge of the metallic pigment particles are very different from that of the resin powder particles.
3, bonding fixed law: the law will metallic pigment and powder coating dry mixing, while heating, the temperature is just over resin softening point, at this time can fix bonding metallic pigment on the surface of the viscosity of the resin powder, thus preventing the powder in the construction and after construction recycling metal pigment and resin powder separation phenomenon, aluminium powder.
