Notes of using bronze powder
May 7, 2012Bronze powder is a floating flake pigment. With a certain proportion of copper, zinc and aluminum alloy in melt milling, it meets to required specifications. Bronze powder’s colors are: red and gold, green gold, green and red gold, bronze gold and so on. More coarse the bronze powder is, the stronger the sense of metal will be. And it becomes more flashing and brightness. If it is finer, sense of metal reduced, the color is gentler and hiding function is better.
Copper powder, with stirring, dozens of times of the copper powder and the solvent is a 1:1 or 2:1. At low shear for approximately 15 minutes the dough. Add to the needs of the golden tones of oil, mix until smooth. The solvent can be adjusted to the desired viscosity. To prevent curling and breakage of the metal powder particles removed and the process to reduce the effects of optical scattering, the best of lies blades or plates, agitation at medium speed.
At the same time, the use of nitrocellulose and an epoxy resin should be avoided. Two of the chemical reaction is the preparation of gelatin, the two resins are used, must be as soon as possible. That is used when the potential value of less than rosin, resin acids, with a value as low as possible. Aromatic hydrocarbons, esters, and can be completely wet particles of copper powder dispersed in a fully carried out, should be avoided by using a solvent alcohol and ketone, fatty acid, a solvent incomplete. Certainly, by using resins with a high purity solvent (low water), containing a small amount of water, it is preferable to use molecular sieves to remove moisture before the pigment copper powder.
Copper powder and the grinding process are fatty acids, to reduce friction and protects the surface of the powder of copper oxide-copper and the second protective layer of fatty acids. At high temperatures, water, perspiration, and the alkaline medium is very easy to damage the surface of the protective layer of copper powder, which means that the oxidation is slow, progressive loss of metallic luster.
Caused and the gloss of the distribution of copper powder particles of dust is excessive, a large proportion of fine particles of less than 3 microns) of copper powder all songs low and the compounds compatible with the float. The very composition of the bronze and copper powder imports are the same color and saturation. Uneven distribution of the particle size of the powder, the thickness of the lower horizontal surface cover, low gloss.
The determination of the bronze powder’s correspondence between wettability and floating deepens the understanding of mechanism of copper powder’s floating. And it proposes a new method for improvements of bronze powder’s floating performance. It provides a new approach for surface treatment of bronze powder (FCu 663). After the use of FSA on the surface modification of bronze powder, bronze powder’s floating and printed brightness are greatly improved. It shortens the gap with imported powders. In the polishing process of bronze powder, bronze powder tablets were flattened polished and has the fragmentation phenomenon. It reduces the performance of surface cover rate’s changes according to the polishing time.Source:http://www.mhcmp.com
Posted by tracy ma. Posted In : metal powder