Why does carbon black pigment need to be post-processed?
The purpose of post-oxidation treatment of carbon black is to change the surface chemical properties. For pigment carbon black, in order to form a stable colloidal dispersion in the paint or ink system, the dispersion of the carbon black pigment in the polar solvent must be improved. Therefore, it is necessary to introduce oxygen-containing functional groups on the surface of carbon black to polarize the surface, that is, surface modification.
Methods for post-oxidation treatment of carbon black pigment
There are many methods for surface modification and oxidation post-treatment of carbon black powder, such as hot air oxidation, nitric acid oxidation, ozone oxidation, helium oxide oxidation and low-temperature plasma oxidation.
Advantages of carbon black pigment oxidation post-treatment
The post-oxidation treatment of carbon black is to change the functional groups on the surface of carbon black. The PH index of carbon black is determined by the acidity and alkalinity of the functional groups on the surface of carbon black. Different surface functional groups of carbon black can react chemically with different base materials, and more It is beneficial to the dispersion of carbon black and the combination with base material.
In fact, regardless of the oxidation treatment of carbon black pigment , carbon black powder must be added to the base material after treatment in order to be better dispersed in the base material. The carbon black pigment powder form after oxidation treatment not only has the advantage of being easily dispersed, but also improves the viscosity, stability and fluidity of the carbon black, and better combines with the base material, so that the cost does not fade or fade.
