specializes in research & development and production of Carbon Black

Importance of Carbon Blacks Particle Size and Distribution

Carbon blacks is a black powder of amorphous carbon. The average particle size range of carbon black models is between 10NM and 500NM, and the surface area of carbon black is very large. The main component is elemental carbon, and contains small amounts of oxygen and sulfur.

The particle properties of carbon blacks are very different from those of general pigments, such as the microstructure of the surface of carbon blacks particles, particle size and specific surface area, surface morphology and surface properties of particles, etc. The pigment properties of carbon black It is quite different from ordinary paints.carbon blacks granules-Beilum Carbon

Carbon black is mainly used in the rubber industry, and only about 10% of carbon black is used as pigment carbon black in the coating, plastic, ink and paper industries.

The classification method of carbon black is relatively confusing. In addition to the carbon black used for rubber and other purposes, as a classification of pigment carbon black, it can be divided into three types: channel carbon black, furnace carbon black and thermal cracking carbon black in terms of production methods.

With the advancement of technology, some furnace carbon black can also reach the quality level of channel carbon black and be used as pigment carbon black; it can be divided into high pigment carbon black and medium pigment carbon black in terms of tinting strength or blackness. There are three types of carbon black and low-pigment carbon black. The properties, performance and cost (price) of carbon black products produced by different production methods are very different.

The application range of carbon blacks is mainly determined by its particle size. Different production methods have different particle size ranges of carbon black.

Generally speaking, the finer the particle size of carbon blacks, the stronger the tinting power, the better the hiding power, and the higher the blackness.

For carbon blacks with the same particle size, carbon blacks with high structure or high unit frequency have higher blackness, hiding power and tinting power.

As pigment carbon black, from the perspective of dispersibility, carbon black with a low structure has little impact on the gloss and leveling of the coating film. The higher the structure of carbon black, the more irregular the shape of the aggregates. The structure of carbon black has a great relationship with the process control of its production method. The structure of thermal cracking carbon black is very low or has no structure (particles exist in a single form) ; The structure of channel carbon black is low, with only 3 to 5 particles fused together; the structure of furnace carbon black is higher, with a dozen or dozens of particles fused together to form developed chain dendrite aggregates.

Carbon blacks particle size plays a critical role in its properties and performance in a variety of products.

In rubber applications, carbon black is added to improve the rubber’s strength, durability and wear resistance. The particle size of carbon black affects the reinforcement efficiency, which is the ability of carbon black to reinforce the rubber matrix. Carbon black with smaller particle size usually has higher reinforcing efficiency, but it also tends to increase the viscosity of the rubber compound.

Carbon blacks is used as a pigment in coatings and printing inks to provide color, opacity and UV protection. The particle size of carbon black affects tinting power, which is the pigment’s ability to impart color to a paint or ink. The smaller the particle size, the higher the tinting strength, but it also increases the viscosity of the paint or ink.

In plastic applications, carbon blacks is added to provide UV protection and color. Carbon black particle size affects dispersion efficiency, which is the ability of carbon black to be evenly distributed in a plastic matrix. Carbon black with smaller particle size usually has higher dispersion efficiency, but it also increases the viscosity of the plastic.

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