Type, content and dispersity of carbon black: Different types of carbon black have different characteristics such as particle size, structure and surface activity, and have different coloring ability and reinforcing effect on plastics. Generally speaking, the smaller the particle size of carbon black, the higher the surface activity, the stronger the coloring power and the better the reinforcement effect. However, if the content of carbon black is too high or the dispersion is uneven, it will lead to the decline of the fluidity of plastics, the difficulty of processing, the appearance of pits or particles on the surface and the decrease of elongation at break.
Type, content and compatibility of carrier resin: The choice of carrier resin should be matched with plastic raw materials to ensure good compatibility and dispersibility. If the carrier resin is incompatible with plastic raw materials or contains too much plastic raw materials, the mechanical properties and elongation at break of plastics will decrease.
Types, contents and functions of processing AIDS: Processing AIDS are additives used to improve the processing performance and quality of black masterbatch, mainly including wetting agents, dispersants, lubricants and antioxidants. Wetting agent and dispersant can promote the mixing and dispersion of carbon black and carrier resin, improve the coloring power and enhance the effect. Lubricant can reduce friction heat and melt viscosity, and improve fluidity and molding efficiency. Antioxidants can prevent thermal oxidation aging and photooxidation aging and prolong service life. However, if the kind of processing AIDS is not suitable or the content is too much, it will affect the mechanical properties and elongation at break of plastics.
To sum up, black masterbatch has a certain influence on the elongation at break of plastics, so it is necessary to choose and use black masterbatch reasonably according to the specific types, uses and requirements of plastics.