Copper powder additives
(1)Ordinary copper powder have good floating performance, we recommend it is not necessary to add a wetting or dispersing agent, otherwise it will reduce its floating nature (metallic effect).
(2)If in order to deliberately adjust the floating performance powder, it can be appropriate to reduce its floating nature (adding 0.1-0.5% citric acid). But this would reduce the metallic effect.
(3)If you still can not obtain the desired optical effect by adjusting the application viscosity and drying time. That is, pigment particles failed to have better orientation.You can add a small amount of lubricant and surface leveling agent.
(3)In general, the performance of copper powder re-dispersed is good. If precipitation is found, it can be added to <2.0% of the anti-settling agent or thixotropic agents, such as swelling disabilities, fumed silica in the formula.
Copper powder dispersion method
(1)join metallic pigments in a slow stirring, add to the gold powder several times 1:1 or 2:1solvent
(2)Stirring for about 15 minutes to a paste at low shear
(3)Join the oil required , stir mixture evenly
(4)Adjusted to the desired viscosity with a solvent
(5)To avoid flake powder particles in the dispersion process and reduce curl and break the optical effect, the best selection is disc blade mixer or dispersing machine
Bronze powder and finished storage
Copper powder and their products should be stored at room temperature and dry conditions. The unused copper powder should be sealed immediately. Otherwise, due to prolonged exposure to copper oxide powder and deterioration in air.