Why is water-soluble pigment carbon black difficult to disperse?

” >Water-based ink is composed of water-based resin, additives, pigments, water and other raw materials. The saturation, tinting strength, transparency and other properties of the ink color are closely related to the properties of carbon black. For water-based inkShanghai Kaiyin ChemicalSuppliedPigment Carbon Black It 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 important meaning of dispersionShanghai Kaiyin ChemicalPigment Carbon BlackAs a pigment, it is a solid component in the ink. It is the color-developing substance of the ink and is insoluble in Water pigment.

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” >Pigments must be dispersed into a state of fine particles that meet optical properties during the application process,Pigment Carbon Black is one of the most difficult pigments to disperse among all pigments, so the quality of dispersion will directly affect the blackness, hue and hiding ability, and directly affect the final result of the user. Effect.

” >The decentralization process is mainly affected by the following three factors

” >1. Essential characteristics: 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 resin for carbon black s Choice.

” >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.

” >Pigment Carbon BlackThe dispersion is the most difficult among the pigments used in paint. This is because the particles have strong polymerization and high oil absorption capacity. 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 increase, become porous and contain volatile matter (generally the volatile matter will increase to More than 10%), without oxidation treatment, its volatile content is only 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.