Carbon black is a commonly used black pigment, which is obtained by calcining organic matter at high temperatures. The blackness of carbon black mainly depends on its carbon content and particle size. The blackness of carbon black can be increased by adding other materials during the manufacturing process.
A common method is to add metal oxides to carbon black. These metal oxides have high ability to absorb light and can effectively improve the blackness of carbon black. Commonly used metal oxides include iron oxide, chromium oxide and titanium oxide. These materials can be added at any stage in the carbon black, but are usually added during the calcination process.
Another method is to add graphite to carbon black. Graphite is a substance with a high carbon content and has excellent ability to absorb light. Adding graphite to carbon black can effectively increase its blackness. Graphite is usually added during the calcination process.
Other carbon materials, such as carbon black and graphite powder, can also be added to carbon black to increase the blackness.
Adding metal oxides, graphite and other materials to carbon black can effectively improve its blackness. When selecting additive materials, their impact on carbon black performance and cost should be considered.