Talking about the application of color developing compatibilizer in coating

In coating applications, we often need to obtain a specific color, which can be achieved by direct grinding, or by preparing a white or other color base paint, and then through the paste color to get the desired color. A good toning system requires an equal and stable color. However, in the process of color adjustment, we often encounter the phenomenon of "floating hair flower", the color is light or dark, and in the case of the paint film is not completely dry, there is a significant color difference, such a color process is not what we expect .
the success of the color-toning process depends?
the stability of the respective pigment fillers in the base paint and slurry. When the base paint and color paste are mixed, the vast majority of additives will re-reach a new equilibrium state among all pigment fillers, and competitive adsorption between dispersants can easily occur at this time.
Competitive adsorption of dispersants during the coating of the base paint and slurry
as shown in the figure, when the dispersants used in the base paint and the dispersants used in the slurry occur competitive adsorption, e.g., there is insufficient dispersant used in the base paint, or the dispersants used in the slurry are more likely to adsorption to the pigment surface of the base paint (in most cases, mainly titanium).
In this case, the dispersants used in the color paste will be partially migrated to the paint filler surface of the base paint, which leads to a reduction in the dispersant adsorption of the pigment surface in the pigment, insufficient stabilization group, easy to reunite, flocculation. In particular, the paint film drying process, with solvent or water volatility, not sufficiently stable pigment than titanium white pigment is more likely to occur reunion, will be earlier in the paint film bottom flocculation, and titanium pigment is more inclined to rich in the surface of the paint film, the appearance of the paint film color intensity is not enough, at the same time refers to the study area of the color will become darker phenomenon.
flocculation that occurs during the coloring process may occur quickly or slowly. Slow flocculation may cause the color of the finished coating to change over time, which will greatly improve the difficulty of product quality control.
can you effectively avoid or improve the floating flowering phenomenon during the color throming process?
, adjusting the formula of the base paint can effectively improve the phenomenon of floating hair flowers.
, add a suitable colorizer to the formula.
the first method:
is usually specific to a specific slurry. That is, if you change the slurry model or supplier, the formulation of the base paint needs to be adjusted again - so it is difficult to obtain a universal base paint formula for all slurry.
Second method:
colorizer additives usually have a high interface activity and a certain stability effect, can be in the pigment surface due to competitive adsorption caused by the distribution of dispersants are not equal, can be the fastest migration to the dispersant insufficient pigment surface, before the dispersant reached rebalancing to provide temporary stabilization effect, so that in the coloring process to prevent the phenomenon of floating flowering. Ingtrol's SURFYNOL ® 2502, Zetasperse® 179 is the recommended colorizer for toner systems.
SURFYNOL® 2502
Performance Features:
Multi-functional additive based on gemon structure for water-based formulation systems that provide balanced wetting, stabilization and foam control , added in the base paint, can improve the color adjustment may appear when the finger study color difference, can also reduce or completely replace the original wetting agent in the formula, reduce the base paint grinding / dispersion time, the water resistance of the paint film has little impact, does not affect the re-painting.
application case:
as shown in the following image, in the water-based acrylic white primer added 1% SURFYNOL® 2502, and then added 1% water-based PV29 pigment slurry for color adjustment, from which we can see that the addition of SURFYNOL® 2502 samples of the finger difference significantly improved, the color difference of the study area from the original 3 or so reduced to 0.5.
Zetasperse® 179
Performance Features:
non-ion surfactants that effectively reduce the viscosity and stability of the coating system, add the appropriate amount of dosage to the base paint, and improve the color intensity of the toner and reduce the finger difference.
application case:
As shown in the figure below, adding 1.5% Zetasperse® 179 to the base paint can increase the color intensity by 37%, while also providing a very high increase in the color difference. Adding Zetasperse ® 179 improves the quality of the coating while reducing the amount of slurry used.
In summary, the floating color flower phenomenon is a relatively easy problem in the process of color adjustment, the solution is mainly to prevent the main, the addition of suitable color display enhancer can effectively improve the color intensity of paint color palette, reduce the color difference.
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