Since the 21st century, due to the advancement of science and technology, the functions of rubber have been continuously developed and used. Now rubber products exist in all aspects of people's lives, supporting people's basic necessities of life. The role of rubber is so great, in addition to the unparalleled advantages of rubber itself, fillers can also endow rubber with more valuable functions, making it more widely used.
What is rubber reinforcement? Filler is one of the main raw materials in the rubber industry, which is a powder material. The amount of filler is quite large, almost equal to the amount of rubber itself. In rubber processing, fillers are divided into reinforcing agents and fillers. The reinforcement of rubber refers to the behavior of adding a substance to rubber to improve the wear resistance, tear strength, tensile strength, modulus, and swelling resistance of vulcanized rubber. Any substance that has this effect is called a reinforcing agent.
Commonly used reinforcing agents: carbon black, silica, short fibers, inorganic nanomaterials, etc. 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 would be no booming rubber industry. According to the effect of carbon black in rubber, carbon black is divided into hard carbon black and soft carbon black.
Hard carbon black: carbon black with particle size below 40nm and high reinforcing function, such as super wear-resistant, medium super wear-resistant, high wear-resistant carbon black, etc. Soft carbon black: Carbon black with a particle size above 40nm and low reinforcing properties, such as semi-reinforcing carbon black, thermal black, etc.
Carbon black for rubber is generally classified and named according to the ASIM-1765-81 specification. The naming system consists of four parts. The first English letter represents the vulcanization speed, N represents the normal vulcanization speed, and S represents the slow vulcanization speed. Followed by three numbers, the first represents the average particle size of carbon black, which is divided into 0~9 grades. The second and third numbers are designated by the D24.41 Committee of the American Society for Materials Testing in charge of carbon black and terminology, reflecting different structure levels, that is, the approximate concave-convex structure of carbon black, which has a certain degree of arbitrariness . Relatively speaking, the larger the number, the taller the structure.