Judging the conductivity of conductive carbon black through the oil absorption value index
Oil absorption value (DBP) is commonly used to express structural properties. The greater the DBP value, the higher the structural properties. The physical properties and conductivity of conductive carbon black depend on the volume and microporosity of these aggregates. The greater the oil absorption value of conductive carbon black DBP, the easier it is to form aggregates with a large number of particles and complex structures, and the more aggregates there are per unit mass.
Therefore, under certain conditions, the greater the DBP oil absorption of carbon black, the stronger its conductivity. Based on the particles that make up the basic aggregates and morphology of carbon black, high-structured carbon black aggregates have large, polymeric particles. This branching increases the contact between aggregates, which can lead to high conductive properties.
Judging the conductivity of carbon black through specific surface area indicators
At the same time, the larger the specific surface area of conductive carbon black, the more aggregates it has per unit mass. That is to say, the higher the structure, the larger the specific surface area and the stronger the conductivity.
Judging the conductivity of carbon black through impurity indicators
The impurities of carbon black mainly represent the purity of carbon black. The higher the purity, the better the conductivity of carbon black.
Judging the conductivity of carbon black through its structure
The conductive performance of carbon black mainly depends on the structure of carbon black. Generally, there is no structure in carbon black indicators. However, the structure of carbon black is a unique and very important property. It represents very fine carbon black. The degree to which particles aggregate into chains or grapes. The higher the structure, the more developed the chain (or grape-like) structure, and the easier it is to form a carbon black spatial network channel structure. This structure is the smallest basic unit that can be maintained when dispersed and is not easily destroyed.
Carbon black is in high polymer species. It exists with aggregates as the basic unit. During the production and processing process, the particle aggregates and polymers are permanently fused together unless there is excessive shearing.
If you want to buy conductive carbon black with high conductivity, you can judge it by the oil absorption value, specific surface area, and impurities of the carbon black. Of course, the structure of carbon black is also very important.