Processability for Specialty Carbon Blacks

Special carbon black is obtained after special treatment of carbon black products in the process of processing. Compared with ordinary carbon black products, special carbon black has certain special properties. Today, we will not talk about its performance, we will talk about the relevant knowledge about its processability. A detailed introduction is given in the following article.

Carbon black requires strong shearing force to ensure its dispersion in plastics. For conductive composites, the shear force must be good in order to obtain good electrical conductivity. As the mixing time increases, the conductivity increases, thus promoting the dispersion of the carbon black before reaching a stable conductivity level. After this equilibrium point, additional mixing will cause a reduction in conductivity, as the carbon black conductive network will therefore deteriorate. Since the shear force during mixing is affected by the type of plastic, the type and content of carbon black, and the type and conditions of mixing equipment, the compounding procedure of the conductive component must be optimized to avoid under- or over-dispersion of the carbon black. . During processing, the orientation of the conductive compound affects the dispersibility of the carbon black particles, and mixing in a specific direction results in a better conductivity than mixing in a vertical direction.

Carbon black has a wide range of uses, in addition to being used in rubber products, there are other uses, so it is divided into two types of carbon black for rubber and special carbon black. Special carbon black can be obtained by post-processing disposable carbon black. The post-treatment is mostly mechanical grinding, chemical vapor phase and liquid phase surface oxidation treatment. Oxidants include nitrogen dioxide, ozone, oxygen, air, nitric acid, ammonium nitrate, potassium permanganate, hypochlorous acid, etc., which can change the properties of the original carbon black to meet different requirements. Specialty carbon blacks are used for coloring, conductive materials such as coatings, inks, resins, black films, toners, films, magnetic tapes, optical discs, etc.