The Role Of Dispersants In The Production Of Paint

1. The Role Of Dispersants In The Production Of Paint The productive dispersion of pigments & fillers in a coating system is important and affects several aspects concerned with the ultimate performance of the system. Among these facets we can talk about the energy needed to acquire the milling and good color development, final product stability & water resistance and alkali dry film. Dispersants greatly influence all these aspects and need careful selection to optimize the systems. The aqueous pigment dispersions historically followed the principles of the "coatings" of the paper industry: at first it was established that the polyphosphates were dispersing and economical for titanium dioxide, calcium carbonate & kaolin. When the industry became more productive it should improve, too, the synthetic polyelectrolyte dispersants utilized also varying composition, are now well known and employed in the coatings industry. These products are able to immerse strongly on the pigment particles to a greater or lesser level depending on the pigment system in which they’re used. What are the possible advantages of employing polymeric dispersants? In physicochemical terms, polymeric dispersants can reduce interactions between pigment particles in a much more efficient than conventional dispersants. The most obvious is to reduce the viscosity of the formulation. The ability to reduce interactions between pigment particles also confers certain benefits associated with the optimization of tinting pigments. We can subdivide the advantages of these dispersants in productivity gains (higher concentrations of pigment), color power (more efficient use of color) and coating quality. Improved productivity: It is feasible to disperse pigment in a polymeric dispersant solution in comparison to a resin solution. This will provide a base grind much higher concentration of pigment to any selected viscosity. The concentrate is then diluted with grinding the resin to give the traditional coating.

2. There is a rise in productivity by achieving higher concentrations of pigment in the grind and with this, more effective utilization of equipment. This is used in those considered difficult to disperse pigments and resins considered low dispersing power. Improved strength of color: All suppliers of dispersants say their employ increases the effectiveness of the strength of the pigment, especially in these cases. This proved to be true if the size of the pigment particle is less than 0.1 microns. It’s recognized that the intrinsic strength of color increases with milling time, the speed with which it tends to plateau in the curve varies from one pigment to another. The issue arises in those bases milling with high proportions of very small pigment particles as they are much more prone to flocculation. It required a productive dispersal system to stabilize these small particles so that the intrinsic strength of the color to develop on the surface of the coating. For more information visit:wcmfgr.com