Bronze Powder

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Bronze Powder


Bronze powder uses copper and zinc as the main raw materials, through smelting, spray powder, ball grinding and polishing process of extremely slight flake metal powder, also called copper zinc alloy powder, commonly known 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. Generally, ordinary bronze powder have good floating properties and it is not necessary to add wetting agents or dispersants, as it may reduce their floating properties (metallic effect).

2. If it is necessary to deliberately adjust the floating properties of the gold powder, the floating force can be appropriately reduced by adding 0.1-0.5% citric acid, but will decrease the metallic effect.

3. If the desired optical effect cannot be achieved even after adjusting the application viscosity and drying time, a small amount of surface lubricant and leveling agent can be added.

4. Generally, bronze powders have good redispersibility. If any precipitation occurs, less than 2.0% of anti-settling agents or thixotropic agent such as bentonite or fumed silica can be added to the formulation.

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

6. Avoid using nitrocellulose and epoxy resins, as both can react chemically with copper and form gelatinous substances. If these resins must be used, they should be used as quickly as possible.

7. Resin with low acid value <3 should be selected as far as possible. The lower the acid value of the resin through the system, the better.

8. Aromatic hydrocarbon and ester solvents help to wet the copper gold powder particles completely and achieve thorough dispersion. Avoid using alcohols and ketone solvents, as well as poorly acidified lipid solvents.

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