The purpose of dispersing pigment carbon black is to make it uniformly distributed in the carrier. The difference in distribution will directly affect the hue, blackness and hiding power of the product. The dispersion of carbon black is mainly controlled by three factors: Factors: the size of the original particles of the pigment carbon black, the level of the structure and other properties; the type of carrier or dispersion medium, after adding the dispersant, it will be coated on the surface of the carbon black particles, thereby reducing the problem of the carbon black particles to a certain extent. The cohesive force that contributes to the dispersion of blackening: the type of dispersing equipment used.

The dispersion of carbon black is crucial in practical applications. When using carbon black for coloring, poor dispersion of carbon black will lead to the following consequences:

  1. The color intensity is unstable, the blackness of pigment carbon black cannot be displayed well, and the apparent color is not good;
  2. Uneven distribution and streaks: 3. Surface unevenness in Shantou ink, paint and other products will cause printing problems;
  3. The filter screen of the extruder is clogged: During the extrusion process of blown film, unbroken carbon black agglomerates cause the film bubble to tear;
  4. Cause single and flat fractures, and reduce the mechanical strength of the product. When carbon black is ground and dispersed, it is the minimum requirement that the pigment carbon black particles reach a certain fineness. Under normal circumstances, the fineness should be ≤15um. In high-end coatings, there will be higher requirements or even less than 5um. The lower the moisture contained in the pigment carbon black, the easier it will be to disperse. Some. This is because in the dispersion system, the static electricity between the pigment carbon black particles is related to the thickness of the double electric layer formed around them. If the thickness of the double electric layer is reduced, it will directly affect the particle dispersion.

Reduction in stability. When the moisture content on the surface of carbon black (or other pigments) particles is high, the thickness of the electric double layer will be reduced, thus affecting the dispersion stability.