Antistatic effect of conductive carbon black

The structure of conductive carbon black is expressed by the degree of aggregation of carbon black particles into chains or grapes. Carbon black composed of agglomerates composed of the size, shape and number of particles in each agglomerate is called high-structure conductive carbon black. The oil absorption value is now commonly used to represent the structure. The larger the oil absorption value, the higher the structure of the conductive carbon black, which simply forms a spatial network channel and is not easy to be damaged. The more conductive carbon black is added, the more severe the defect between the resin and the conductive carbon black, which affects the coating's ability to resist moisture and oxygen penetration.

It can be seen from the test that the increase of conductive carbon black is 2.1% to 2.4%. The hydrogen content contained in the conductive carbon black is not certain. The surface of the conductive carbon black particles is attached with a layer of hydrogen. For the conductive carbon black with a finer particle size, it is enough to distribute the hydrogen content on the surface. For the low surface conductive carbon black There is some hydrogen bound inside the carbon particles.

At the same time, because the surface contains a lot of polar groups, there are defects such as difficult to disperse and easy to flocculate. One of the simple and effective solutions is to add a dispersant to reduce the attraction and cohesion between carbon black particles, and then make it uniform and stable. scattered in the matrix