Both acidic carbon black and alkaline carbon black are carbon blacks that have been post-treated. Acid carbon black contains active groups on the surface and is acidic, while alkaline carbon black contains active groups on the surface and is alkaline.
How to choose alkaline carbon black and acidic carbon blacks ?
Regarding the choice of the acidity and alkalinity of carbon black pigment, it mainly depends on the formula of the production process. Different process formulas 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 react chemically with other raw materials. If other raw materials can react with acidic surface active groups, acidic carbon blacks should be selected. , can react with active groups on alkaline surfaces, so you need to choose alkaline carbon black.
The pH value of carbon black represents the acidity and alkalinity of carbon black. The pH value of carbon black has a certain impact on the physical properties of rubber and plastic products. The pH value can promote or delay the vulcanization speed of rubber. A high pH value will speed up the vulcanization speed of rubber; a low pH value will delay the vulcanization speed of rubber and plastic products. Product vulcanization speed.
Based on the pH value of carbon black, carbon black can be divided into alkaline carbon blacks and acidic carbon blacks. So which one is better, alkaline pigment carbon black or acidic pigment carbon black?
In fact, there is no good or bad difference between acidic carbon black and alkaline carbon black. It is just that the pH value of carbon black obtained by the processing method is different, and the pH value of carbon black can be improved through technology. When choosing between acidic pigment carbon black and alkaline pigment carbon black, it should be considered according to which product to be processed is easier to disperse and integrate.
Generally speaking, the pH value of channel carbon black is weakly acidic, which can delay the vulcanization of rubber materials; the pH value of furnace carbon black is alkaline, which will promote the vulcanization of rubber materials.
Methods to improve the pH value of carbon black through technology: During the processing of carbon black, the pH value of carbon black can be adjusted by changing its binder, indirectly heating the carbon black, changing the exhaust gas of the exhaust furnace, etc. The pH value of wet carbon black is mainly affected by the drying process. If you want to change the pH value of wet carbon black, you can use different drying methods when drying wet carbon black particles. You can improve the internal structure of the dryer. Achieve their goals.
