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.

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.

How to Blend Paint Pigments For The Best Effect

Paint pigments are dry powdery substances, incorporated to base paint mediums to produce any shade conceivable for use to the surface of your preference. The base mediums are fluids that perform as a hauler for the paint pigments, offering a fluid to extend the pigment over a surface and fix it there. Not like a dye, paint pigments don’t liquefy into the medium, rather it dissolves throughout the fluid, remaining as minute compounds. To find an even level of distribution, the pigment for paint should first be blended into a solution that unites the medium effortlessly. This prevents clustering of the pigments which would otherwise produce unevenly shaded paints. So, let’s have a look at how to blend paint pigments:

• Blend the pigment in an equally measured solution of methyl alcohol and water until you develop a taste of the blend for incorporating pigments to the water-based painting mediums. Employ a sanitized, wooden stirrer to blend the pigments. Make sure the blend is evenly shaded throughout, since this is a sign that the pigment is prepared fully and ready for use.
• Blend the pigments with a solvent of the equal volume if incorporating to an alcohol-based, solvent-based or oil-based painting mode instead; utilizing the solvent that is well-matched with the exact medium you’ve in mind.
• Merge diverse pigments to accomplish a color blend, employing ready-made techniques, or experimenting with blending proportions yourself to acquire the color wanted. Sustain the overall pigment to water ratios while blending through, to make it simpler to unite the finished pigment blend with the paint mode.
• Dispense the paint mode base that you want to employ into a container, white base is ideal for acquiring the best effect of the added pigments.
• Put in the pigment blend to the base medium, blending the 2 with the wooden stirrer until mixed completely. Scrutinize the paint blend for any concentrations of shade, then carry on blending until all indications of color separation in the blend are vanished. Employ the blended paint as quickly as feasible, or cap the paint container firmly for later use.

So, these are the methods you should follow strictly when looking to mix paint pigments for the best possible effect. If you want to buy the best pigments for coating or paint, then get in touch with WC Manufacturing, an industry leader in producing specialty pigments and aqueous pigment dispersions. So, feel free to call us now!