When dyes are added to paint, sometimes problems can arise when the pigments do not disperse evenly. Flocculation, dull colors, low transparency, and rheological stability issues can be avoided when using properly designed dyes like those produced by Wanlong.
In theory, good dispersion means that each pigment particle of the paint will mix evenly and prevent flocculation. That is to say, each pigment particle will be surrounded by a thin layer of paint binder or solvent instead of particles sticking to one another. However, achieving this level of completely uniform dispersion is not possible. Despite this fact, we work hard to get achieve perfection even though we know all we can do is come extremely close. The extent of pigment dispersity on coating performance are explained in the following sections:
- Gloss: The glossiness of a mixture can be directly increased when the pigment is optimally dispersed. Principally, the gloss is determined by the properties of the paint base. Adding unnecessary pigments can only have negative effects on the glossiness. The glossiness can even be reduced if the pigments are not dispersed well because of the diffused reflection of light occurring on uneven surfaces resulting from the agglomeration of pigments.
- Tolerance: Weather fastness and chemical resistance of coating are primarily determined by the paint base used. The tolerance of the coating can be reduced because of insufficient dispersion of the pigment. Inversely, the tolerance can be improved by properly dispersing pigments. For example, the weather fastness can be improved by reflecting (TiO2) or absorbing ultraviolet radiation (iron oxide red).
- Storage period: The storage period of the coating depends largely on the quality of the pigment dispersion. It can be easily understood that the settling of excessive sediment in the coating will have a negative effect on the storage of the coating. These stability problems are caused either by the so-called ‘rewetting’ or the re-flocculation of the pigment. The stability of the pigment paste is good enough, which will cause the re-flocculation even when the pigments were dispersed properly previously.
- Color, color intensity, transparency and hiding power: All of these properties largely depend on the surface of the pigment used, ie the "optimal dispersion". For all kinds of dyes, the pigments with fine dispersity can achieve the best result in its hue and color purity. The fine dispersity also can enhance the hiding power and color intensity (no flocculation) of the pigment with applied hiding and enhance the transparency of the transparent pigment.