Bronze Powder

Bronze powder uses copper and zinc as the primary raw materials. It is produced through processes such as smelting, spray powder, ball grinding, and polishing to create extremely fine flake metal powder. Also known as copper-zinc alloy powder, it is commonly referred to as gold powder.

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Bronze powder

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Product Introduction

Bronze powder, also known as copper zinc gold powder or gold powder, is an extremely fine, flake-like metal powder processed through smelting, powder spraying, ball milling, polishing, and oxidation of copper and zinc as the main raw materials. Copper alloys can exhibit various colors on the surface, including red, golden yellow, white, and even purple, depending on the composition. The color shade of bronze powder varies with the zinc content. When the zinc content is below 10%, it produces a light gold effect, known as pale gold; when it is between 10% and 25%, it produces a rich light gold effect, known as rich pale gold; when it is between 25% and 30%, it produces a rich light gold effect, known as rich gold.

Performance Parameter of Bronze Powder

Grades	Shades	D-50 Value	Water Coverage	Characteristics	Application
220Mesh	Pale Gold/Rich Pale Gold/Rich Gold	36-40	2500-3500	High Brightness Strong Metallic Effect
400Mesh	Pale Gold/Rich Pale Gold/Rich Gold	23-27	3500-4500	High Brightness Strong Metallic Effect
600Mesh	Pale Gold/Rich Pale Gold/Rich Gold	16-20	4000-5000	High Brightness Strong Metallic Effect
800Mesh	Pale Gold/Rich Pale Gold/Rich Gold	13-15	4500-5500	High Brightness
1000Mesh	Pale Gold/Rich Pale Gold/Rich Gold	9-11	6000-7000	Fine High Brightness
1200Mesh	Pale Gold/Rich Pale Gold/Rich Gold	6-8	7000-8000	High Brightness
1500Mesh	Pale Gold/Rich Pale Gold/Rich Gold	2-4	10000-13000	High Brightness Good Stability
Gravure Printing	Pale Gold/RichPale Gold/Rich Gold	36-40	3000-4000	High Brightness Strong Metallic Effect
Gravure Printing	Pale Gold/Rich Pale Gold/Rich Gold	23-27	4000-5000	High Brightness Strong Metallic Effect
Gravure Printing	Pale Gold/Rich Pale Gold/Rich Gold	16-20	4500-5500	High Brightness Strong Metallic Effect
Gravure Printing Powder	Pale Gold/Rich Pale Gold/Rich Gold	6-8	8000-10000	High Brightness Excellent Hiding Good Flake Structure
Gravure Printing Pellets	Pale Gold/Rich Pale Gold/Rich Gold	6-8	/	Dust-free Easy to Disperse

Performance Parameter of Copper Powder

Grades	D-50 Value	Water Coverage	Characteristics	Application
800Mesh	13-15	4500-5500	High Brightness
1200Mesh	6-8	7000-8000	High Brightness

Precautions

1. Floating Properties: Ordinary bronze powder typically has good floating properties, meaning it naturally rises to the surface. It is usually unnecessary to add wetting agents or dispersants, as these can reduce their floating properties and diminish the metallic effect.

2. Adjusting Floating Properties: If adjusting the floating properties of the bronze powder is necessary, adding 0.1-0.5% citric acid can reduce the floating force. However, this will also decrease the metallic effect.

3. Enhancing Optical Effect: If the desired optical effect is not achieved after adjusting application viscosity and drying time, a small amount of surface lubricant and levelling agent can be added.

4. Redispersibility: Generally, bronze powders exhibit good redispersibility. In case of precipitation, less than 2.0% of anti-settling agents or thixotropic agents, such as bentonite or fumed silica, can be added to the formulation.

5. Storage: Bronze powder and its finished products should be stored at room temperature in a dry environment. Any unused bronze powder should be sealed immediately, as prolonged exposure to air can cause oxidation and deterioration.

6. Resin Compatibility: Avoid using nitrocellulose and epoxy resins, as they can chemically react with copper, forming gelatinous substances. If these resins must be used, they should be applied as quickly as possible.

7. Resin Selection: Select resins with an acid value of less than 3 whenever possible. The lower the acid value of the resin, the better it will perform in the system.

8. Solvent Selection: Aromatic hydrocarbon and ester solvents are recommended for wetting copper gold powder particles completely and achieving thorough dispersion. Avoid using alcohols, ketone solvents, and poorly acidified lipid solvents.