Methods and techniques for the use of copper and gold powder
发表时间：2016-1-14 15:23:01 浏览次数：1763
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:
You should avoid using nitrocellulose 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.
You should use low acid value as far as possible (less than 3) of the resin, the resin of the lower acid value system.
9:28 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 high purity of resin, and a solvent (low water content, such as containing a small amount of water, suggested in prior to joining copper gold powder pigment using molecular sieve to remove water.
Using method:
You should join the bronze powder in the slow stirring, fractional to copper and gold powder with 1:1 or 2:1 solvent.
in the low shear stirring for about 15 minutes until a paste.
By adding the required transfer gold oil, stir evenly mixed.
By using solvent to adjust viscosity.
to avoid sheet copper gold powder particle the dispersion process curling and breaking is reduced optical effect, the best choice of blade agitator or disc disperser, medium speed mixing can be.
