The difference and selection method of acidic and alkaline carbon black
Carbon black is divided into alkaline and acidic. The acidity and alkalinity of carbon black are mainly judged by the pH value of carbon black. From the appearance, there is no difference between alkaline carbon black and acidic carbon black , but there are still some subtle differences in use.
The reason why carbon black has acidity and alkalinity
Generally, the acidity and alkalinity of the produced carbon black is fixed. Whether it is acidic carbon black or basic carbon black is related to the carbon black production process.
Generally speaking, the pH value of channel carbon black is weakly acidic, which can delay the vulcanization of the rubber compound; the pH value of furnace carbon black is alkaline, which will promote the vulcanization of the rubber compound. Carbon black not only has a specified acidity and alkalinity during production, but also can change the acidity and alkalinity of carbon black in post-processing.
The difference between acidity and alkalinity of carbon black
Acidic carbon black is carbon black containing active groups on the surface, while alkaline carbon black containing active groups on the surface.
What are the selection methods of acidity and alkalinity of carbon black
Regarding the choice of acidity and alkalinity of carbon black, it mainly depends on the formulation of the production process. Different process formulations have different requirements for the acidity and alkalinity of carbon black.
To put it simply, the acidity and alkalinity of carbon black is determined by the active groups on the surface, and the active groups on the surface need to chemically react with other raw materials. If other raw materials can react with the active groups on the acidic surface, you must choose acidic carbon black. If you can react with the active groups on the alkaline surface, you must choose basic carbon black.
