Methods and techniques for the use of copper and gold powder
发表时间：2016-1-14 14:51:58 浏览次数：1691
Copper and gold powder is a kind of floating flake pigment. It is composed of a certain proportion of copper, zinc and aluminum alloy. Pink Yao Dexing copper gold production technology are: red gold, green gold, green gold, gold and other colors such as bronze.
Copper and gold powder is thicker, the metal sense is stronger, more and more bright, brightness is good; conversely, the more thin, metal feeling is abate, the color is also softer, hiding power is better.
Copper powder in the process of ball milling will be added to the fatty acid, to reduce friction and protect the copper from oxidation, so the surface of copper and gold powder are fatty acid protective layer. High temperature, water, sweat and alkaline media are very easy to damage the surface of the protective layer of copper and gold powder, and then make it slow oxidation, gradually lost the original metal luster.
Matters needing attention:
Should avoid the use of nitro cellulose and epoxy resin. Because the two will react with extends to generate jelly; such as must use these two kinds of resin, should as far as possible in a short period of time using bronze powder.
Should use low acid value as far as possible (less than 3) of the resin, the resin of the lower acid value system.
Aromatic hydrocarbons and esters solvent helps to make bronze powder particle complete wetting to fully dispersed, should avoid the use of alcohol and ketone solvents and acidification incomplete lipid solvent.
Be sure to use a high purity of resin and solvent (low water content), such as a small amount of water, it is recommended to add copper powder pigment before the use of molecular sieve to remove water.
Using method:
Adding the copper powder in the slow stirring, the fraction of the gold powder to add 1:1 or 2:1 solvent.
Stir for about 15 minutes until a paste at low shear force.
Add the required adjustment of the oil, and fully mix and mix well.
Solvent is used to adjust to the desired viscosity.
To avoid sheet copper gold powder particles in the dispersed curling process and fracture and reduce the optical effect, the best choice of blade agitator or disc dispersion machine, medium speed mixing can be.
