Conductive Carbon Black has the requirement of stability to chemicals, light and heat, which is incomparable to other carbon black, black inorganic pigments and organic pigments.
Carbon black added to conductive coatings will have less reflection, high blackness, good weather resistance, strong coloring power and other characteristics. This is the reason that conductive coatings will be added to carbon black, specific coatings added to the conductive carbon black has what role?
The role of adding conductive carbon black pigment in paint
The addition of conductive carbon black in the coating will make the coating receive the basic properties of carbon black, such as the ability to directly affect the blackness of the coating, rheology, and gloss and other properties.
When the carbon black particle size becomes smaller or surface area increases, the blackness increases, which is due to increased absorption of light, less reflection, so that people feel more black, viscosity increases, the dispersion decreases, because the gravitational force between the particles increases, destroying the adhesion of the body requires more energy, the gloss reduces the coating for the light reflection of the coating is reduced.
When the carbon black structure increases, blackness decreases, coating needs to increase when the free-flowing coating decreases, poor dispersion, more shear is needed to break up the agglomerates, gloss decreases, coating needs to increase, less free coating on the surface.
When the surface activity of carbon black increases blackness increases, viscosity decreases, dispersion increases and gloss increases. This is equivalent to adding an effective lubricant or dispersant, which reduces the interfacial resistance of the carbon black to be lubricated by the paint and helps the paint penetrate into the carbon black particles.
Adding conductive carbon black to coatings need to pay attention to.
The addition of conductive carbon black in the coating needs to consider the dispersion problem, this is because the dispersion of carbon black is difficult among the pigments, this is due to the high degree of aggregation and agglomeration of carbon black particles, oil absorption, the higher the blackness of carbon black, the more difficult to disperse. The higher the blackness of carbon black, the more difficult it is to be dispersed.
Carbon black forms unstable suspension point in the paint, which often makes the carbon black particles re-attachment in the process of paint storage and makes the paint return to roughness and depreciation.
Methods to solve the problem of speciality carbon black in coatings
In order to improve the impact of conductive carbon black on the quality of paint and the stability of black paint storage, carbon black post-treatment is a well-established method