A Comparison of the Quality of Carbon Black Dispersions Prepared by Dry and Wet Grind Processes

摘要

One of the important properties of black basecoats is jetness. This jetness results from defloccu-lated carbon black pigments, the diameter of which is much less than 100 nm. Currently, the carbon black pigment dispersions for waterborne systems are made with a dry grinding process, which involves two-roll milling. Although we know that this dry grinding process is better in obtaining high jetness than a wet grinding process, we have not clearly understood why. Without understanding the basic mechanism of deflocculation with the dry grinding, further formulation and process improvement will be limited.