The function of dispersant
Time：
2021-11-12
The function of the dispersant is to use the wetting dispersant 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. It is specifically reflected in the following aspects:
1. Enhance gloss and improve leveling effect. The actual gloss mainly depends on the scattering of light on the coating surface (that is, a certain degree of flatness is sufficient). Of course, the detection instrument needs to determine whether it is flat enough, taking into account not only the number and shape of the primary particles but also their combination mode. When the particle size is less than half of the incident light (this value is uncertain), it is manifested as refracted light, and the gloss will no longer increase. Similarly, the covering power that mainly relies on scattering to provide covering power will not increase either (except for carbon black which mainly relies on absorbing light) I forgot about the organic pigments. Note: This incident light refers to the range of visible light. It's hard to say if it's leveling. However, it should be noted that a reduction in the original number of particles reduces the structural viscosity, but an increase in the specific surface area will lead to a decrease in the amount of free resin. It is hard to say whether there is a balance point, but generally, the finer the powder coating leveling is not the better.
2. Prevent color floating and mottling.
3. Enhance tinting strength. Note that in an automatic color-matching system, tinting strength is not necessarily the higher the better.
4. Reduce viscosity and increase the pigment loading capacity.
5. Reducing flocculation is like this, but the finer the particles, the higher the surface energy, and the higher the adsorption strength of the dispersant required. However, a dispersant with too high adsorption strength may cause adverse effects on the performance of the coating film.
6. The reason for increasing storage stability is actually similar to the above. Once the stability strength of the dispersant is insufficient, the storage stability will deteriorate instead (of course, there is no problem from your picture).
7. Enhance color development, increase color saturation, transparency (for organic pigments) or covering power (for inorganic pigments).
TEGO Dispers wetting and dispersing agent helps to wet and stabilize pigments, prevent floating color mottling and pigment sedimentation, maintain stable pigment covering power and color intensity during storage, and at the same time ensure the maximum color yield and the fewestern grinding steps. Because these additives can reduce viscosity and increase the pigment concentration to the highest level during dispersion, the produced coatings and pigment concentrates are more cost-effective. TEGODispers 757 W is recommended for the production of water-based pigment concentrates. It is also the preferred product for corrosion-resistant water-based coatings. Like TEGODispers 750W and TEGODispers 755W, it can meet the highest optical and rheological performance requirements. For universal color pastes applicable to both solvent-based and water-based formulations, the TEGODispers 65x series is the existing market standard product without ethoxy alkylphenol. TEGODispers 656, 670 and 685 are particularly suitable for modern solvent-based formulations. In the UV system, TEGODispers 685 is suitable for all pigments, and TEGODispers 688 is suitable for matte powders. All TEGODispers products are free of ethoxy alkylphenols.
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