Carbon black pigment is used for coloring in products such as ink, paint, and coatings. But how do you choose the right carbon black pigment? Of course, for technical engineers familiar with carbon black, this question is not worth mentioning. However, Tianyi Carbon Black believes that it is necessary to popularize the basic knowledge of the application of carbon black pigment for those who are not familiar with carbon black. Today, I will talk about the selection of carbon black pigment.
First of all, before making a choice, you need to consider what requirements you want to achieve with carbon black. Is it for coloring, toning, UV resistance, or conductivity? Of course, these are very simple for people who have been in the industry for many years. But for those who are not familiar with carbon black, they need to communicate with experienced technical engineers to jointly evaluate the material system and select the most suitable type of carbon black.
Usually, for coloring purposes, carbon black with high blackness and small particle size should be selected, but it must be ensured that the carbon black is completely dispersed reasonably, otherwise, it will not be able to meet the requirements. For toning purposes, carbon black with moderate blackness, large particle size, and easy dispersion should be selected. If carbon black is to be used for UV resistance, carbon black with medium particle size and slightly higher structure should be selected, and it will have better UV resistance performance.
Among them, the blackness of carbon black pigment is actually the reflectivity of carbon black. It is often represented by data obtained from reflectivity measurements. The higher the blackness, the lower the reflectivity. The blackness can also reflect the original particle size of carbon black to a large extent. 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, reflecting the physical, electrochemical, and application properties of carbon black. The structure of carbon black is a characteristic value of the degree of branching of the chain formed by the aggregation of carbon black particles, which represents the level of internal voids of carbon black, usually represented by the oil absorption value.
It was also mentioned above that the dispersibility of carbon black pigment is of great significance in the application process. Pigments must be in a dispersed state that meets optical properties when in use. Carbon black is one of the most difficult pigments to disperse, so the dispersion of carbon black will directly affect the blackness, hue, and covering ability of carbon black, and directly affect the application effect of carbon black pigment.