Why should Pigment Carbon Black be post-treated?
The purpose of post-oxidation treatment of carbon black is to change the surface chemical properties. For pigment carbon black, in order to make the paint or ink system form a stable colloidal dispersion, it is necessary to improve the dispersion of carbon black pigments in polar solvents. Therefore, it is necessary to introduce oxygen-containing functional groups on the surface of carbon black to polarize the surface, that is, to modify the surface.
Advantages of Carbon Black 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, and different functional groups on the surface of carbon black can chemically react with different base materials. It is beneficial to the dispersion of carbon black and the combination with the base material.
The volatile content of pigment black is also higher, and the oxygen-containing functional groups of the particles increase. That is to say, the oxidized carbon black has the advantages of enhanced hydrophilicity, increased specific surface area, and improved dispersibility.
In order to better disperse in the base material, pigment carbon black is also added to the base material after treatment. The carbon black after oxidation treatment not only has the advantage of being easy to disperse, but also improves the viscosity, stability and fluidity of the carbon black, and is better combined with the base material, so that the cost does not fade and does not fade.