What is carbon black?
Carbon black (also called carbon black) is a colloidal particle similar to a sphere formed by incomplete combustion or thermal cracking of hydrocarbon compounds (liquid or gaseous). It exists in the form of aggregates and appears as pure black powder or granular. The particle size, structure and surface activity of products vary greatly depending on raw materials, manufacturing methods and production processes. The main component of carbon black is carbon, and also contains trace amounts of hydrogen, oxygen, ash and moisture.
What is the history of carbon black?
Carbon black has a long history. China is the first country in the world to discover and produce carbon black, with a history of more than 3,000 years. Initially, carbon black was only used to make ink. With the rapid development of industry, carbon black has also been applied to other fields, and the production technology of carbon black is also constantly improving. Since the early 1950s, it has successfully developed channel carbon black, drum carbon black, mixed gas carbon black and gas furnace carbon black. The production technology of carbon black has become more and more mature, and it has developed by leaps and bounds in recent years.
With the continuous improvement of various technologies, the current carbon black varieties mainly include conductive carbon black, rubber carbon black, pigment carbon black, acetylene carbon black, spray carbon black, cement mortar carbon black, thermal cracking carbon black, and semi-reinforced carbon Black and special carbon black, these carbon blacks have different characteristics and are used in different fields.
What are the functions of carbon black?
Mainly used as reinforcing agent and filler for rubber, its consumption is about half of rubber consumption. Carbon black for rubber accounts for 94% of the total carbon black, of which about 60% is used in tire manufacturing. In addition, it is also used as a colorant for inks, coatings and plastics, and as a UV-shielding agent for plastic products. It is also an important additive in many other products, such as electrodes, dry batteries, resistors, explosives, cosmetics and polishing pastes.
Carbon black is used in rubber, such as in the tire industry, rubber seals, shock-absorbing parts, etc. A certain amount of carbon black in rubber products can serve as reinforcement and filling to improve the performance of rubber products.
What is the bulk density of carbon black?
Based on the structure and physical form of carbon black, the volume density of carbon black varies greatly among various grades of carbon black. Due to the presence of enclosed air, the bulk density of carbon black is lower than the true density (specific gravity) of carbon black.
What is the shelf life of carbon black?
When stored under ambient conditions, carbon black is not susceptible to decomposition and its shelf life is not limited. Over time, carbon black absorbs moisture until it reaches an equilibrium value. If moisture effects are important, carbon black should be stored in a dry environment and as tightly sealed as possible.
What makes carbon black conductive?
Carbon black is largely composed of graphite-like carbon layers. Similar to graphite, carbon black exhibits the ability to conduct electricity and has a relatively low electrical resistance (i.e., it is a semiconductor).