Factors to consider when choosing to use powdered or granular carbon black
Sep 06, 2022
Granular carbon black is easier to store, transport and handle than powdered carbon black. With less dust, it is easier to clean, reducing production management issues. Granular carbon blacks are also less expensive than their powdered counterparts. The main disadvantage of using granular carbon black is that it is more difficult to disperse than the corresponding powdered carbon black. Powdered carbon black must be used when the corresponding dispersing equipment is not sufficient to disperse granular carbon black.
Dispersibility of carbon black
The dispersibility of carbon black generally refers to its easy or difficult dispersibility. Usually a relative measure of the dispersibility of standard carbon blacks. As the surface area/structure of the carbon black increases, the dispersibility of the carbon black increases. But other properties of carbon black change with surface area and structure.
Shelf life of carbon black
When stored in a dry, sealed environment, carbon black is less susceptible to decomposition and has an unlimited shelf life. Over time, carbon black will absorb moisture until an equilibrium value is reached. If the effect of moisture is important, the carbon black should be stored in a dry environment and as tightly closed as possible.
In order to improve certain properties of carbon black, the chemisorption of oxygen on the surface of carbon black is increased by post-oxidation treatment, thereby improving the dispersibility and stability of carbon black and reducing the viscosity of carbon black.
PH value of carbon black
The PH value of carbon black refers to the amount of oxygen adsorbed by carbon black existing on the surface of carbon black. For most grades, low concentrations of oxygen compounds and minimal amounts of water-soluble salts on furnace blacks will neutralize slightly alkaline pH. To enhance specific properties, carbon blacks are surface oxidized to increase the presence of chemical oxygen groups, and these products usually have an acidic pH.
