Carbon black manufacturer

Carbon black for rubber

Carbon black is the most important reinforcing filler in the rubber industry. It is no exaggeration to say that without the carbon black industry, there is no rubber industry that is now booming.

The carbon black is classified into hard carbon black and soft carbon black according to the action of carbon black in the rubber.

Hard carbon black: carbon black with a particle size below 40 nm and high reinforcing performance, such as super wear resistance, medium super wear resistance, high wear resistance carbon black, etc.

Soft carbon black: carbon black having a particle diameter of 40 nm or more and low reinforcing property, such as semi-reinforcing carbon black and thermal black.

Carbon black for rubber and black carbon black are generally classified according to the ASIM-1765-81 standard. The naming system consists of four parts. The first English letter represents the vulcanization rate, N represents the normal vulcanization rate, and S represents the slow vulcanization rate. It is followed by three numbers. The first one represents the average particle size range of carbon black, which is divided into 0~9 grades. The second and third figures are specified by the American Society for Testing and Materials, which is responsible for carbon black and the term D24.41. It reflects the different degree of structure, that is, the approximate height and structure of carbon black, and has certain arbitrariness. Relatively speaking, the larger the number, the higher the structure.

Carbon black manufacturer introduces carbon black reinforcement mechanism

In the past half century, people have conducted extensive discussions on the mechanism of carbon black reinforcement and proposed a variety of reinforcement theories.

Volume effect

Weak and strong bond theory

Bueche's theory of finite elongation of carbon black particles and rubber chains

Shell model theory

Rubber macromolecular chain sliding theory

Although the first four mechanisms can all explain certain problems, they have limitations. As time progresses, the experts continue to deepen the mechanism, and the carbon black reinforcement mechanism of the rubber macromolecular sliding theory is a relatively perfect theory.