Metallic printing ink refers to an ink formulated with a metallic pigment and has a metallic luster. Generally speaking, gold ink and silver ink are such inks. The pigments of metallic inks are mainly gold powder and silver powder (copper powder and aluminum powder), and other pigments may be added to produce inks with special colors, which are called colored metal inks. When the binder is acidic, the reaction with the trace amount of sulfur is easy to blacken; after printing, the action of sulfur in the atmosphere will gradually lose its luster. Therefore, gold ink can also be used as a pigment with aluminum powder and dye. The gloss is slightly worse.
The metal ink binder generally uses a resin with a very low acid value and a low amine value, so as not to affect the gloss of the ink, such as ethyl cellulose, nitrocellulose, polyvinyl acetate, ketone resin, polyamide resin, and some wax. Class substances to improve the suspension state of the pigment. Metallic inks can also be formulated in a solvent-based manner, but they are often used now because of their smallness. The polarity of the solvent does not need to be too large, otherwise the pigment will precipitate easily due to excessive wetting. A solvent such as xylene or isopropanol can be used as a solvent for the metal ink.
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