Introduction of the use and main functions of pigment carbon black

Pigment carbon black is used as a coloring agent in paints, inks, plastics, chemical fiber and leather chemicals. Its main function is coloring. Such carbon black can be called pigment carbon black. According to the coloring intensity (or blackness) and particle size, it is generally divided into high pigmentation tank black (HCC), high pigmentation furnace black (HCF), medium pigmentation tank black (MCC), medium pigmentation furnace black (MCF), and common pigmentation tank black. (RCC), common pigment furnace black (RCF) and low pigment furnace black (LCF). It has been produced by the contact method and is currently produced by the furnace method. Since the surface of the carbon black has a small oxygen content, it needs to be oxidized to improve the coloring property. 1) Several typical parameters of carbon black

Blackness (reflectance) - carbon blackness is usually expressed by the data measured by the "reflectance meter". In most cases, it also reflects the original particle size of the carbon black, which is a measure of the market price of the carbon black. One of the important parameters. The lower the reflectance, the higher the blackness of the carbon black and the smaller the particle size. vice versa.

Volatile content - The amount of oxygen-containing groups on the surface of carbon black reflects the surface physical properties, electrochemical properties and application properties of carbon black, and is one of the important parameters to measure the market price of the carbon black.

Structure - The carbon black structure is a characteristic value of the degree of chain formation formed by carbon black microparticle aggregates, which indicates the degree of voids inside the carbon black. Usually expressed as the oil absorption value (DBP absorption value).

2) The important significance of ink carbon black dispersion

Pigments must be dispersed into the micro-particle state in accordance with optical properties during application. Carbon black is one of the most difficult pigments among all pigments. Therefore, the dispersion of carbon black directly affects the blackness and hue of carbon black. And the ability to cover, directly affect the final use of the user.

The dispersion process of carbon black is mainly affected by three factors.

a) The essential properties of carbon black: The original particle size, structure and surface groups of carbon black have a great influence on the dispersion. In general, carbon black has a small original particle size, a low structure, and low dispersion of volatiles, and vice versa.

b) User's formula: The formulation of the carbon black user, the properties of the binder, solvent and resin will significantly affect the final dispersion of the carbon black, especially the choice of resin for carbon black.

c) Dispersing equipment: The dispersion effect of different dispersing equipment under the same conditions is completely different. The correct choice of dispersing equipment is a must that users must pay attention to.

3) Basic ideas for choosing carbon black

The first thing users should consider before choosing carbon black is: What do you want to achieve with carbon black? Coloring, tinting, UV resistance or electrical conduction. The most important thing is to communicate with the professional technicians of carbon black, and jointly evaluate the material system and choose the suitable carbon black variety. Usually the situation is:

For coloring - choose carbon black with high blackness and small particle size, but make sure that the carbon black is properly and completely dispersed, otherwise it will run counter to the original requirements.

For color matching - choose carbon black with low blackness, large particle size and easy dispersion.

UV-resistant - mainly used in plastics and rubber, the choice of medium-sized, slightly higher-structured carbon black, their best UV resistance.