Copper gold powder (also known as gold powder) is made from copper-zinc alloy as raw material and through special mechanical processing and surface chemical treatment to obtain a scaly structure, which can float in the binder material, present a golden luster, and has the nature of a pigment.Metal pigment.
Classification
200-mesh copper gold powder: Flying gold, fabric printing gold, suitable for rapid printing. Characteristics: High luminosity, strong metal feeling.
400-mesh copper gold powder: Flying gold, gold paint, fabric printing gold, also suitable for screen printing, wallpaper, coatings and incorporation into plastics. Characteristics: High luminosity, strong metal feeling.
600-mesh copper gold powder: Flying gold, gold paint, fabric printing gold, screen printing, handicraft coating, etc. Characteristics: High luminosity, strong metal feeling.
800-mesh copper gold powder: Used for fabric printing, spray lacquer, plastics, wallpaper "pointed tip" coatings for both water-based and non-water-based uses.
1000-mesh copper gold powder: Used for manufacturing spray lacquer with high brightness, wooden materials, screen printing ink and rubber relief plate ink. Characteristics: Fine, high brightness.
1200-mesh copper gold powder: Suitable for printing ink, paint, plastics, screen printing ink, etc. Characteristics: High brightness.
1500-mesh copper gold powder: Excellent performance, high gloss, good stability, can be used for manufacturing canned offset printing ink.
Application fields
Copper gold powder is mainly used in handicrafts, paints, inks, coatings, printing and other industries
Purity
The commonly used determination method for high-content copper is still the ancient iodometric method, which has large dosage of potassium iodide, high cost and long time-consuming. The newly developed photometric method is not suitable for the determination of high-content copper due to the problem of copper chromogenic agent. Therefore, it is necessary to study and develop new chromogenic agents. The author of this article tried to control the pH value with acetate-sodium acetate buffer solution, and used disodium ethylenediaminetetraacetate (EDTA) as the chromogenic agent to determine the high-content copper in copper gold powder. At the same time, EDTA was used to mask elements such as zinc and aluminum to eliminate their interference. Cu^2+ and EDTA form a blue complex with a molar ratio of 1:1. The maximum absorption wavelength of this complex is 2 = 730nm, and the molar absorptivity is ε = 88.9. The content of copper ions shows a good linear relationship within the range of 12-24mg/50mL. The linear regression equation is A = 0.0354 + 0.02317c, and the linear correlation coefficient R = 0.9995. The determination of high-content copper in copper gold powder by EDTA spectrophotometry gives satisfactory results and has prospects for development and application, especially suitable for laboratories of medium and small enterprises with relatively simple equipment.
Storage method
Copper gold powder and its finished products should be stored at room temperature and in a dry environment; unused copper gold powder should be sealed immediately. Otherwise, copper gold powder will deteriorate due to oxidation if exposed to air for a long time.