The conductivity of conductive carbon black is mainly determined by the distance and quantity of carbon particles in the carbon black.Like metal conductivity,the thicker the metal wire,the better the conductivity.So how do we correctly understand and choose conductive carbon black?
The oil absorption value and structure of conductive carbon black.High structured carbon black has good conductivity.
2.The content of non carbon materials is relatively low,while the content of carbon black in the rubber compound is relatively high.
3.The particle size is relatively small,usually around 20-40nm,and most electric carbon black particles are within this range.
4.Low volatile matter and few surface oxygen groups indicate that carbon black is neutral.
5.The solvent extraction material is low,making it difficult to form an insulating layer.
6.High iodine absorption.
7.Good dispersibility and uniform dispersion of conductive carbon black directly affect the increase of effective components in carbon black.
8.It is better to treat carbon black after heating.
9.Add as much as possible(at cost and without affecting the properties of the compound).
As long as we pay attention to the above points,we can choose conductive carbon black like fish in water and find satisfactory products.