The Role Of Dispersants

The function of dispersants is to use wetting dispersants to reduce the time and energy required to complete the dispersion process, stabilize the dispersed pigment dispersion, modify the surface properties of pigment particles, and adjust the mobility of pigment particles, which is reflected in the following aspects:
Shorten dispersion time, improve gloss, enhance coloring and covering power, improve color spreading and blending properties, prevent floating and blooming, prevent flocculation, and prevent sedimentation.
1. Improving the gloss and increasing the leveling effect. The actual gloss mainly depends on the scattering of light by the coating surface (i.e. a certain level of flatness). Of course, it needs to be determined by the testing instrument whether it is smooth enough, not only considering the number and shape of the original particles, but also their combination method. When the particle size is less than 1/2 of the incident light (this value is uncertain), it manifests as refracted light, and the gloss will not improve again, Similarly, the covering power that relies on scattering to provide the main covering power will not increase (except for carbon black, which mainly relies on absorbing light, organic pigments forget). Note: The incident light refers to the range of visible light, which cannot be described as flat; However, it is important to note that a decrease in the number of native particles reduces their structural viscosity. However, an increase in the specific surface area will result in a decrease in the number of free resins. It is unclear whether there is a balance point, but generally, the finer the powder coating, the better.
2. Prevent floating colors and blooming.
3. Improve coloring power. Note that higher coloring power is not necessarily better in automatic color adjustment systems.
4. Reduce viscosity and increase pigment loading.
5. Reducing flocculation is like this, but the finer the particle surface energy, the higher the need for a dispersant with higher adsorption strength. However, dispersants with too high adsorption strength may cause adverse effects on the film performance.
6. The reason for increasing storage stability is actually similar to the above. Once the stability strength of the dispersant is not enough, the storage stability becomes worse (of course, from your picture, there is no problem).
7. Increase color development, increase color saturation, and increase transparency (organic pigments) or hiding power (inorganic pigments).