Manufacturers teach you to understand the main reasons for the preparation of pigment carbon black

Black is one of the most important colors in many colors, with the most common use of pigmented carbon black. So what problems do you need to use pigmented carbon black in the coatings field? Which are the main reasons for determining color paste? The following carbon black manufacturers come together.

1. Why do pigment carbon blacks have blue and red phases?

Technical engineers working on pigment carbon black processing will have an understanding: carbon black will have a blue phase and a red phase. Carbon black is undoubtedly black, so why are there subtle differences in hue? What are the characteristics of these phenomena related to carbon black?

The sunlight is absorbed, and the visual expression without reflected light is blackness. However, carbon black particles are small, and fine particles can reflect very little light, and the wavelength of light has a certain relationship with the particle size. The carbon black particles are distributed in a coating or the like, and the reflected partial wavelengths of light are different. Correspondingly, the black paint will show a blue or red phase.

When the original particle size of carbon black is smaller, the blackness of its own is higher, and the red phase will be more obvious; the carbon black product with larger particle size will show a better blue phase. But its own blackness is not as good as the former. Much depends on the grinding efficiency of the grinding equipment. The original particle size of the red phase carbon black is small, and the requirements for the grinding equipment are relatively higher in actual use.

2. What are the factors affecting the blackness of carbon black paste?

The same kind of carbon black, the more complete the carbon black dispersion, the blackness will naturally be good. The better the carbon black dispersion, the larger 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, which refers to the original particle size. In many cases, the grinding is very good, but the blackness is still not good, which may be the reason for the original particle size of carbon black. When the carbon black is sufficiently dispersed, the finer the carbon black, the higher the blackness. Therefore, when we get the blackness of the black paste is not enough, do not always think that the carbon black itself has problems, the preparation of the grinding process and equipment should also be considered.

3, carbon black paste must use black cat pigment carbon black?

In the preparation of carbon black syrup, in order to pursue blackness, high pigment carbon black is selected. In fact, this law is not entirely true. First of all, the carbon black paste used in each industry has different requirements, and the most suitable one is the best. Some industry applications can use low-end rubber carbon black to prepare black pulp. In addition, the dispersing difficulty of different pigment carbon blacks is different, and the dispersing aid system required is also different, for example, high pigment carbon black is not easily dispersed.

Technology, equipment, and process have become important factors in the preparation of color paste from pigmented carbon black, and it is best to prepare products under the optimal cost and performance conditions.