Carbon black, also known as carbon black, is an amorphous carbon.It is a light, loose and extremely fine black powder with a very large surface area, ranging from 10 to 3000m2/g. It is the incomplete combustion of carbonaceous substances (coal, natural gas, heavy oil, fuel oil, etc.)or thermally decomposed products.Those made of natural gas are called "gas black", those made of oil are called "lamp black", and those made of acetylene are called "acetylene black".In addition, there are "slot black" and "furnace black".According to the properties of carbon black, there are "reinforcing carbon black", "conductive carbon black" and "wear-resistant carbon black".It can be used as a black dye for the manufacture of Chinese ink, ink, paint, etc., and also used as a reinforcing agent for rubber.
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Chemical Properties
The production process of carbon black is different, and the chemical properties of the surface are also different.The true surface area of most carbon blacks is greater than the geometric surface area calculated from particle size.This is due to the existence of many micropores on the surface of carbon black, especially carbon black with a particle size of less than 25 nm.The greater the amount of carbon black filling, the greater the density of carbon black particles or carbon black particle aggregates in the dispersed state, the smaller the average distance between particles, the higher the probability of mutual contact, the carbon black particles or carbon black particle aggregates.There are also more conductive paths formed.The higher the polarity of the blend system composed of polymers of different polarities and carbon black, the larger the critical volume fraction of carbon black, which means that the conductivity of the system decreases, because the surface of carbon black contains strong polar groups,The polarity of the matrix is large and the effect is enhanced. At this time, the strength increases, but it prevents the agglomeration of the conductive particles themselves, resulting in poor conductivity.
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