Demixing

The demixing of binders and pigments is an undesirable phenomenon that can occur in paints, varnishes and coating materials. It is caused by physical and chemical instabilities within the system, where the components are not evenly distributed in the mixture. The result is an uneven distribution of the pigments, which can impair the optical and mechanical properties of the coating.

The causes of demixing (segregation) often lie in insufficient compatibility between the binder and pigments. Differences in polarity, surface energy or density ratios can lead to pigments settling or agglomerating in the coating. Poor dispersion of the pigments during the manufacturing process can also promote segregation. In addition, external factors such as temperature or humidity fluctuations influence the stability of the mixture.

To avoid demixing, the selection of compatible binders and pigments is crucial. Additives such as dispersants can also be used to distribute the pigments evenly and improve the stability of the mixture. Careful process control when mixing and processing the materials also plays an important role.

If demixing is not prevented, it can lead to problems such as color deviations, insufficient opacity or reduced adhesion of the coating. It is therefore essential to pay attention to the homogeneity of the mixture during the formulation and production of coating materials.