What Role Does Carbon Black Play in Sealant Strips?

This involves the modification of polymer materials. The simple point is that there are many types of rubber products, and the use conditions and performance requirements are different. According to the main use functions, the products include tape, hose, rubber sheet, rubber shock absorption products, rubber Sealing products, rubber rollers, conductive or anti-static rubber products, hard rubber and rubber shoes, etc., and each type of rubber products are refined into several varieties according to their purpose and conditions of use. In order to meet the performance and use requirements of various products, rubber formulators comprehensively consider the selection of reasonable formulas, various compounding agents, and processing systems from the use of rubber, vulcanization system, reinforcing and filling system, softening system, anti-aging system and processing system. Add process conditions to meet the requirements of product performance. By adding inorganic materials to change some of its properties to make it more suitable for this purpose, adding carbon black to the sealing strip is one of the typical examples of adding nano-scale materials to polymer products for modification. In short:

Carbon black is an important reinforcing filler in the reinforcing filling system. It has an important influence on the physical and mechanical properties and processing technology of the rubber compound, but it has a far-reaching influence on the heat resistance, oil resistance, and corrosion resistance of the rubber compound. Not as big and direct as rubber, vulcanization system and protection system. For this reason, the general rubber formulators do not pay much attention to the specific performance indicators of a certain carbon black as much as the carbon black technicians. They often only pay attention to the selection of a certain type of carbon black, and do not examine the specific indicators of the use of carbon black in detail or pass Varieties of carbon black are used together, and carbon black and inorganic fillers are used together to meet the requirements of the product. Therefore, it is difficult to quantify the impact of specific physical and chemical indicators of carbon black.

The reinforcing effect of carbon black on rubber is determined by the unique basic properties of carbon black. The finer the carbon black particles, the higher the structure and the better the reinforcement. Tests have proved that carbon black can have better reinforcement when the specific surface area is greater than 50m2·g-1, that is, when the particle size of carbon black is less than 50nm, the aggregates enter the cross-linked network of the vulcanizate, and the rubber molecules can be fully absorbed in the Carbon black particles are on the surface and are firmly bonded together.