Knowledge

Structure and main properties of carbon black



The structure of carbon black is expressed by the degree of aggregation of carbon black particles into a chain or a grape. Carbon black composed of aggregates composed of the size and shape of the aggregates and the number of particles in each aggregate is referred to as high structure carbon black. At present, the commonly used oil absorption value indicates structurality, and the larger the oil absorption value, the higher the structure of the carbon black, and it is easy to form a space network channel, and it is not easy to be destroyed. The high-structure carbon black particles are fine, the network chain is tightly packed, the specific surface area is large, and the unit mass particles are large, which is favorable for forming a chain-type conductive structure in the polymer, wherein acetylene black is preferred among many carbon black varieties. 

Carbon black particles with a broad particle size distribution are more capable of imparting conductivity to the polymer than narrowly distributed carbon black particles, and this phenomenon is explained statistically. For carbon black with a wide particle size distribution, a small number of large-diameter particles require a large number, and smaller diameter particles are compensated. The carbon black with the same average particle size distribution has more total particles than the narrow carbon black.