Ultrasonic paint disperserThe mechanism did not take into account the influence of air molecules, water molecules, and solvent molecules adsorbed by coating particles. In fact, the surface of the aggregated coating particles is surrounded by air and water molecules, while the dispersed coating particles are surrounded by solvents. Air, water, and solvents will definitely have an impact on the dispersion process. During the wetting process, the air molecules adsorbed around the coating particles are first replaced by solvent molecules. Then, the coating affinity groups in the dispersant molecules bind with the pigment particles, resulting in anchoring. But most of the surface of the coating particles is still adsorbed by solvent molecules. Therefore, there is reason to believe that dispersants and solvents form adsorption competition on the surface of coatings. From a thermodynamic perspective, due to the specialized design of dispersant molecules, they have a competitive advantage in adsorption on the surface of coatings, thus maintaining the stability of the dispersion system.

From a dynamic perspective, before the solvent molecules adsorbed on the surface of the coating are replaced by the pro coating groups of the dispersant, the surface of the coating particles is surrounded by solvent molecules. After the dispersing agent macromolecules unfold in the solvent, their molecular chains are also adsorbed by the solvent, that is, they are solvated. Therefore, the solvent molecules on the surface of the coating particles and the solvent molecules around the dispersant molecules must be simultaneously displaced, and then the combination of the dispersant molecules and the coating particles can be completed. During this process, the van der Waals forces between solvent molecules and coating particles and dispersant molecules cannot be ignored, and are manifested as resistance to dispersion. So, it can be imagined that,Ultrasonic paint disperserRemoving the solvent during this process, or extracting the solvent in the later stages of dispersion, will inevitably be beneficial for dispersion. After eliminating the competition of solvents, due to the increased contact area, even if hydrogen bonding and polarization cannot be formed between coating particles and dispersant molecules, a strong anchoring effect can be obtained solely by relying on van der Waals forces.

The idea is to keep the dispersant in a molten state under heating and directly participate in grinding. In this way, the air molecules adsorbed on the surface of the coating particles are directly replaced by dispersant molecules and combined. The advantage of this approach is low energy consumption and high efficiency, but the disadvantage is that the viscosity of the dispersant in the molten state cannot be too high, which requiresUltrasonic paint disperserThe relative molecular weight of the dispersant should not be too high. Another approach is to involve solvents in the early stages, as solvents can make coating particles more easily wetted. That is, solvent molecules first replace the air molecules on the surface of the coating particles, and then heating or negative pressure, or heating and negative pressure at the same time, causes the solvent to evaporate, promoting the tight bonding between the coating particles and the dispersant molecules. The advantage of this approach is that it is applicable to most dispersants, but the disadvantage is that the energy consumption of volatile solvents is high.