How to choose pigment carbon black?

Pigmented carbon blacks are used to color products such as inks, paints and coatings. But how to choose pigment carbon black? Of course, this question is not worth mentioning to technical engineers familiar with carbon black. However, Sundaway Carbon believes it is necessary to promote the basics of pigment carbon blacks to those who do not understand carbon blacks. Today, let's talk about how to choose pigment carbon black.

First, before choosing, you need to consider the requirements you want to achieve with carbon black. Tinted, tinted, UV resistant or conductive. Of course, it is very simple for someone who has been in the industry for many years. However, those unfamiliar with carbon black need to communicate with an experienced carbon black technical engineer to jointly perform a technical evaluation of the material system and select the appropriate carbon black variety. Generally, the carbon black used for coloring is one with high blackness and small particle size, but it must be ensured that the carbon black is properly and completely dispersed, otherwise it will not meet its own requirements. The carbon black used for color matching needs to choose a carbon black with high blackness, large particle size and easy dispersion. If you want to use carbon black to achieve UV resistance, you should choose carbon black with medium particle size and slightly higher structure, which has better UV resistance.

Among them, the blackness of pigment carbon black is actually the reflectivity of carbon black. It is usually expressed as data measured by reflectance. The higher the blackness, the lower the reflectivity. Blackness can also reflect the original particle size of carbon black. Generally, the higher the blackness of carbon black, the smaller the particle size. The volatile content of carbon black indicates the number of oxygen-containing groups on the surface of carbon black and reflects the physical, electrochemical and application properties of carbon black. The structure of carbon black, a characteristic value of the degree of branching formed by the aggregates of carbon black particles, indicates the level of voids inside the carbon black, usually expressed as an oil absorption value.

The dispersibility of pigment carbon black is very important in the application process. Depending on the optical properties, the pigment must be dispersed in a fine particle state. Carbon black is a pigment that is difficult to disperse in all pigments. Therefore, the dispersibility of carbon black directly affects the blackness, hue and opacity of carbon black. This capability directly affects the use of pigmented carbon blacks.