Application Of Pigment Carbon Black in Water-based Ink

Water-based ink is composed of water-based resin, additives, pigments, water and other raw materials. As a pigment, pigment carbon black is a solid component in the ink. It is the color-developing substance of the ink and is a pigment that is insoluble in water. The color saturation, tinting strength, transparency and other properties of water-based ink are closely related to the properties of pigment carbon black. Pigment black for water-based ink is a black solid powdery substance. It is the main solid component of water-based ink and is the visible color body part printed on the object. To a large extent determines the quality of water-based ink. The importance of pigment carbon black dispersion
In actual production, the dispersion of pigment carbon black is the most difficult among the pigments used in paints. This is because the particles have strong polymerization and high oil absorption. There is a tendency to form unstable suspended particles in the paint. During the storage process, the initially dispersed color paste or finished paint will resume polymerization, causing the particles to agglomerate and become thicker and thicker. For example, after improved dispersion and oxidation treatment, the specific surface area will be increased, porous and containing volatile matter (generally the volatile matter will increase to more than 10%). Without oxidation treatment, the volatile matter content will only be about 5%. . In this way, due to the increase in surface volatiles, the hydrophilicity becomes larger and the dispersion is also improved to a certain extent. During the application process, pigments must be dispersed into a state of fine particles that meet optical properties. Pigment black is the most difficult to disperse among all pigments, so the quality of dispersion will directly affect the blackness, hue and hiding ability. to the user’s final use effect.
The dispersion process of carbon black in the production process of water-based ink is mainly affected by the following three factors:
1. Essential characteristics: The original particle size, structure and various surface groups will have a great impact on dispersion. Under normal circumstances, it is difficult to disperse when the original particle size is small, the structure is low, and the volatile content is low. On the contrary, it is relatively easy.
2. User’s formula: The user’s formula, base material, solvent and resin properties will all significantly affect the final dispersion, especially the choice of resin for carbon black.
3. Dispersion equipment: The dispersion effects of different dispersion equipment under the same conditions are also very different. Engineers must pay attention to the selection of correct dispersion equipment.