Colored carbon black is an important black pigment used in industries such as ink, coatings, and plastics. With the development of these industries, the requirements for the dispersibility, flowability, and other application properties of colored carbon black are constantly increasing. After oxidation treatment, oxygen-containing functional groups are introduced on the surface of carbon black to activate it, thereby improving its dispersibility and flowability.
Ozone is a strong oxidant, and ozone oxidation of carbon black is a typical representative of carbon black gas-phase treatment. After ozone oxidation treatment of carbon black under certain conditions, the structure of carbon black will decrease, the surface volatile content will increase, and the flowability will increase. The properties of oxidized carbon black in coatings and inks, such as viscosity, dispersibility, and flowability, will be improved.
In the entire process of carbon black ozone oxidation treatment, the ozone generator system and ozone reaction device are key equipment. The ozone oxidation of carbon black is carried out in the ozone reactor and works continuously during the production process, while large-scale production is generally in a continuous working state. The factors that need to be controlled in the process of carbon black oxidation treatment include ozone production and concentration, contact mode, reaction time, reaction temperature, and other aspects.
Design Method of Carbon Black Ozone Generation System
In the application of carbon black ozone oxidation, ozone generators with ozone production of generally 1-2KG/H or more are used. The ozone generation system adopts a fully automatic control mode, which can be fully or partially put into production. The ozone concentration is 15-25mg/l, and the entire system works continuously. High concentration ozone reaction equipment can be used for experimental small yields of 100-200 kilograms.
The treatment process of ozone oxidized carbon black
Ozone oxidation treatment of carbon black should adopt different treatment processes based on the amount of treatment, the size of the diameter, and the technical requirements of the treatment.
One method is static reaction (fixed bed oxidation method), which involves loading carbon black into a reactor and then introducing ozone while stirring the carbon black. After a period of reaction, the treatment requirements are met. This method is suitable for situations with small processing capacity and high processing quality requirements.
The second method is the dynamic reaction method (fluidized bed oxidation method), which involves introducing granular or powdered carbon black into the reactor at a certain flow rate and contacting it with ozone in reverse flow to complete the oxidation process. The reaction time should be fully controlled to achieve the best treatment effect.