Application of pigment carbon black in industrial coatings
Release time:
2022-10-10
COLOR BLACK
Pigment·Carbon Black
01
Pigment Carbon Black Introduction
Color black: Carbon black used as a coloring pigment in inks, paints, coatings, plastics and other products. According to the blackness or coloring strength and particle size, it is generally divided into four types: high-pigment carbon black, medium-pigment carbon black, ordinary-pigment carbon black and low-pigment carbon black. The main production processes of carbon black are channel process, furnace process and lamp process. At present, high-pigment carbon black is mainly channel process carbon black.
02
Various factors affecting the application effect of carbon black in coatings
Carbon black characteristics : particle size, structure, surface treatment.
Particle size: The smaller the particle size, the better the blackness will be, the better the main blue color will be, and it requires a long dispersion time and a large dispersion shear force.
Structure : The structure includes oil absorption value and specific surface area. The higher the structure, the higher the oil absorption value and the larger the specific surface area; the more difficult it is to disperse the carbon black, and the greater the viscosity of the system.
Surface treatment: Surface treatment is carried out through quinone or carboxyl groups. The higher the degree of treatment, the better the stability of carbon black dispersion. The viscosity is less affected, the dispersion stability is better, and the carbon black tinting strength and brightness are higher.
Dispersant selection:
The original particle size of high-pigment carbon black is small, the structure is low, and the surface treatment is insufficient, resulting in a large amount of air in the gaps between the carbon black. It takes a longer time to wetting, and it is necessary to select a high molecular polymer containing pigment anchoring groups as a dispersant.
At the same time, it is necessary to use dispersion and stabilization additives to prevent agglomeration and flocculation to achieve the best dispersion effect of carbon black, so as to reflect the best blackness and stability of carbon black.
Dispersion conditions and dispersion equipment:
Grinding slurry, pre-dispersion, wet the carbon black in the resin containing dispersant, high shear grinding equipment is required to disperse the carbon black agglomerates, and the dispersion equipment is ground through sand milling, bead milling, ball milling, and three-roll milling.
03
Carbon black performance parameters and application characteristics
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04
Summary of the application of pigment carbon black in industrial coatings
High-pigment carbon black: TD890 and TD900 are successfully used in automotive paint, automotive repair paint, wheel paint, powder coating, color paste, etc., with high blackness, strong tinting power, and not easy to flocculate.
Medium and high pigment carbon black: TD888 is used in automotive interior plastic paint, wheel paint, and wood paint. It has the characteristics of high blackness, easy dispersion, and good stability.
Ordinary pigment carbon black: TD589P and TD588P are used in automobile bumpers, ordinary motorcycle paints, coil coatings, wood plastics, etc. They have good blackness, good blue color, are easy to disperse, and have high cost performance.
05
Question and Answer Session
Why does TD890 have the highest blackness and tinting strength? What other advantages does it have?
TD890 is a channel carbon black with a comprehensive surface oxidation treatment. It is easy to combine with dispersants and resins, showing high blackness and high tinting strength. It has a smaller primary particle size and a lower oil absorption value, making it easier to disperse without flocculation.
Compared with similar products on the market, it has better cost-effectiveness.
Does it meet the requirements for heavy metals and polycyclic aromatic hydrocarbons?
Currently, ordinary pigments, medium pigments and high pigment carbon black all meet the requirements of heavy metals and polycyclic aromatic hydrocarbons, and have relevant SGS certification reports.
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