Why does the excessive amount of carbon black in the rubber compound produce a “dilution effect”

 

The so-called “dilution effect” is due to the excessive amount of carbon black used in the rubber compound, the relative reduction in the number of rubber, resulting in close contact between carbon black particles, and can not be well dispersed in the rubber compound, which is It is the “dilution effect”. In this way, because of the existence of many large carbon black granules, the rubber molecules cannot penetrate into the carbon black granules, the interaction between rubber and carbon black is reduced, and the strength is reduced and the expected reinforcement cannot be achieved.