What are the factors that affect the blackness of black color paste?

The blackness of the black color paste has a great relationship with the dispersion and the original particle size. For the same carbon black, the more fully dispersed the carbon black, the better the blackness will naturally be. The better the dispersion of carbon black, the greater the total surface area of the pigment, the greater the ability to absorb light, and the higher the blackness, that is, the darker the color.

The other is the carbon black particle size, here refers to the original particle size. In many cases, the grinding is sufficient, but the blackness is still not good, which may be the reason for the original particle size of carbon black. The size of the carbon black primary particles determines the blackness of the carbon black. The primary particles of high-pigment carbon black are about 10 nanometers, and the ordinary carbon black is more than 50 nanometers. When the carbon black is fully dispersed, the finer the carbon black, the higher the blackness. Otherwise, the blackness of the high-pigment carbon black sample may not be as good as that of ordinary carbon black, which is also the situation encountered by many people. Therefore, when the blackness of the black paste we get is not enough, do not always think that there is a problem with the carbon black itself, but indulge in the selection of carbon black pigments, the preparation and grinding process and equipment must also be considered, and the grinding process can be fully dispersed. Charcoal black pulp.