two different substances. White carbon black is silicon dioxide.
Precipitated silica is a high-tech inorganic fine chemical product, which is made by reacting liquid sodium silicate with high-quality transparent inorganic acid, filtered, washed and dried. White carbon black is an essential reinforcing agent and reinforcing agent for the rubber industry and plastic products. Due to its unusual particle characteristics, it is a high-purity, extremely small particle, non-toxic, odorless, lightweight silica, which shows that it has excellent reinforcement, thickening, matting, dispersibility, It is widely used in many industrial fields such as rubber, plastics, coatings, cosmetics, medicine, pesticides, sealants, papermaking, etc. It is one of the indispensable raw materials in many chemical industries and occupies a dominant position.
In fact, there is another kind of fumed white carbon black, which is produced by the gas phase method, also known as light silica. Its properties are similar to carbon black, white, and the original particles are extremely fine, up to 20 nanometers. After absorbing water, it becomes aggregated fine particles, with large surface area and dispersion ability, high mechanical strength and tear resistance index. Containing 80-95% of the best carbon dioxide.
The product is widely used in rubber and plastic filling and reinforcing agent, ink thickener, paint additive, synthetic grease and silicone grease thickener, flatting agent for leather industry, pesticide dispersant, paper filler, synthetic resin ( Polyester resin, elastic polyurethane) additives, electrical and electronic insulation fillers and daily chemical raw materials and other industries. At the same time, it is used as an opening agent for polypropylene and non-toxic polyvinyl chloride plastic films, as well as an anti-caking agent and carrier for food, pesticides and medicines. The main component of carbon black is carbon.
It is a black powdery substance formed by incomplete gas phase combustion or pyrolysis of hydrocarbons under strictly controlled process conditions. Its composition is mainly elemental carbon, and contains a small amount of oxygen, hydrogen and sulfur. Carbon black particles are approximately spherical, with a particle size between 10 and 500 μm. Many particles often fuse or coalesce into three-dimensional bonded dendritic or fibrous aggregates. In rubber processing, it is added into rubber by mixing as reinforcing agent (see reinforcing material) and filler.
Carbon black is one of the oldest industrial products. As early as BC, China used the incomplete combustion of plants to produce pigment carbon black. In 1872, the United States first used natural gas as raw material to produce carbon black by channel method. At that time, carbon black was also still mainly used as a colorant. After S.C. Mott discovered the reinforcing effect of carbon black on rubber in 1912, the carbon black industry developed rapidly. In the 1920s, gas furnace black and thermal black with natural gas as raw materials appeared again. R.D. Snow began to study efficient carbon black production methods in 1937. Later, J.C. Craig devoted himself to the production of carbon black from liquid hydrocarbons and developed the oil furnace process. In 1941, the first batch of oil furnace black was trial produced. In 1943, the world's first industrial-scale oil furnace black factory was put into operation in the United States. Today, the oil furnace method is the most efficient and economical carbon black production method. The output of oil furnace black has accounted for 70% to 90% of the total carbon black.