When it comes to dispersants , maybe everyone is strange. First, let's look at the definition of dispersants. A dispersant is a surfactant having both opposite properties of lipophilicity and hydrophilicity in a molecule. The solid and liquid particles of inorganic, organic pigments which are difficult to dissolve in the liquid can be uniformly dispersed, and the sedimentation and aggregation of the particles can be prevented, and the amphiphilic reagent required for the stable suspension can be formed. Next, let's look at the role of the dispersant. It uses a wetting and dispersing agent to reduce the time and energy required to complete the dispersion process, stabilize the dispersed pigment dispersion, modify the surface properties of the pigment particles, and adjust the motility of the pigment particles. Specifically embodied in the following aspects:
1. Improve the gloss and increase the leveling effect. The actual effect depends on the scattering of light on the surface of the coating (that is, a certain degree of flatness. Of course, the instrument needs to determine whether it is flat enough, not only considering the number and shape of the primary particles, but also considering their Combined mode), when the particle size is smaller than the incident light 1/2 (this value is uncertain), it will be refracted light, the gloss will not increase any more, and the opacity of the opacity by scattering to provide the main hiding power will not increase ( Except for carbon black, it mainly relies on absorption of light, and organic pigments are forgotten). Note: The incident light means that the range of visible light is not well-balanced; however, paying attention to the reduction of the original number of particles is to reduce the structural viscosity, but the increase of the surface area will reduce the number of free resins, and whether there is a balance point is not good. However, the general leveling of powder coatings is not as fine as possible.
2, to prevent floating color hair.
3, improve the tinting strength Note that the tinting strength is not as high as possible in the automatic color system.
4. Reduce the viscosity and increase the amount of pigment loaded.
5. The reduction of flocculation is such that the higher the surface energy of the finer particles, the higher the adsorption strength of the dispersant, but the dispersant with too high adsorption strength may cause adverse effects on the film properties.
6, increase storage stability In fact, the reason is similar, once the dispersant stability strength is not enough, but the storage stability is worse (of course, from your picture is no problem).
7. Increase color rendering, increase color saturation, increase transparency (organic pigments) or hiding power (inorganic pigments).
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