carbon black It is one of the oldest industrial products. At present, there are three kinds of furnace cracking methods in the world. According to scientific research, pigment charcoal Black comes from fine particles formed after incomplete combustion of coal, petroleum and biomass fuels. The process of hydrocarbon pyrolysis is not strictly controlled. Its composition is mainly elemental carbon, and contains a small amount of oxygen, hydrogen and sulfur.
Today, 95% of the pigments on the market charcoal Black is made by the furnace method. The feed oil is injected into a high temperature reactor, in which hydrocarbons are cracked and dehydrogenated to form carbon and graphite like microstructure. A small particle that condenses to form an aggregate. The operation after the reactor includes granulation of "fluffy" low-density carbon black products, and then through a series of post-treatment and oxidation processes to improve performance.
The raw materials for the production of pigment pigment carbon black are petroleum products and pitch coal tar products, which are formed by incomplete combustion or pyrolysis of hydrocarbons at high temperature; carbon black, carbon black, pigment carbon black, environmental protection carbon black, carbon black, pigment carbon black, environmental protection carbon black, carbon black, pigment carbon black, environmental protection carbon black are produced with natural gas as the main raw material and channel steel as the flame contact surface. This kind of carbon black is called trough black Experts said that compared with furnace black and hot cracking black, its particles are smaller and the specific surface area is larger, which can give ink good fluidity and printing performance.
It is also the main product with high color retention performance as the auxiliary material of paint color matching. Pigment trough black is widely used in ink and paint paste, carbon black, pigment carbon black, environmental protection carbon black, carbon black, pigment carbon black, environmental protection carbon black, especially in news ink. In the process of coating manufacturing, high pigment trough black gives excellent blackness and luster to high-grade automobile topcoat, and medium pigment trough black is used for general industrial coatings.
In the optimal dispersion, the dispersant was adsorbed on the surface of carbon black aggregate. Therefore, the amount of dispersant needed to form fluid dispersion is related to the surface area of carbon black. Under the same conditions, if the addition amount is the same, the larger the side specific surface area, more dispersant is needed. Granular products are easier to store, handle and transport than powder products. Granular carbon black products are not easy to fly, more clean and easy to handle, less management problems. Granular products are not as expensive as powder products.
Experts engaged in the R & D and production of masterbatch carbon black introduced that compared with the corresponding powder products, it was more difficult to disperse. Compared with powdered pigment carbon black, granular products have higher requirements for dispersion equipment. When the existing dispersion equipment is not enough to disperse granular products, it is better to choose powdered carbon black.
The dispersion of the pigment carbon black is the most difficult one among the pigments used in the paint because of its strong polymerization and high oil absorption. There is a tendency to form unstable suspended particles in the paint. In the process of storage, the initially dispersed color paste or finished color paint will resume polymerization again to agglomerate the particles, resulting in coarsening and thickening. If the dispersibility and oxidation treatment are improved, the specific surface area will be increased, and the volatile matter will be porous and contain volatiles (generally, the volatile matter will increase to more than 10%). The volatile content of the non oxidized treatment is only about 5%. As a result of the increase of the surface volatiles, the hydrophilicity and dispersity of the product are improved. In the process of application, pigments should be dispersed to the state of microparticles in line with optical performance. Pigment carbon black is the most difficult pigment to disperse among all pigments. Therefore, the quality of dispersion will directly affect the blackness, hue and covering ability, and directly affect the final use effect of users.
Water based ink is composed of water-based resin, additives, pigments, water and other raw materials. In ink, as a solid pigment, is not allowed. The color saturation, coloring power and transparency of water-based ink are closely related to the performance of pigment carbon black. Water based ink pigment carbon black is a black solid powder. It is a water-based ink in the main solid component, is printed on the object visible color body part. To a large extent, it determines the quality of water-based ink.
The production of water-based ink should choose the surface contains more chemical adsorption oxygen-containing groups of carbon black, especially containing hydrocarbon, carboxyl and other strong hydrophilic groups charcoal Black, for the benefit of carbon black In water long-term suspension, so that water-based ink has better stability.