The Mechanism Of The Ultrasonic Coating Disperser

The mechanism of the ultrasonic coating disperser does not take into account the effects of air molecules, water molecules and solvent molecules adsorbed by the coating particles. In fact, the surface of the coating particles in the agglomerated state is surrounded by air and water molecules, and the dispersed coating particles are surrounded by the solvent. 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. The coating affinity group in the dispersant molecule then combines with the pigment particles to effect anchoring. However, most of the surface of the coating particles is still adsorbed by solvent molecules. Therefore, it is reasonable to assume that the dispersant and the solvent form an adsorption competition on the surface of the coating. From the perspective of thermodynamics, since the dispersant molecules are specifically designed to have a competitive advantage on the adsorption of the coating surface, the dispersion system is maintained stable.

From a kinetic point of view, the surface of the coating particles is surrounded by solvent molecules before the solvent molecules adsorbed on the surface of the coating are replaced by the pro-coating groups of the dispersant. After the dispersant macromolecule is unfolded in the solvent, its molecular chain is also adsorbed by the solvent, that is, it is solvated. Therefore, the solvent molecules on the surface of the coating particles and the solvent molecules around the dispersant molecules must be simultaneously discharged, and then the combination of the dispersant molecules and the coating particles can be completed. During this process, the van der Waals forces between the solvent molecules and the coating particles and dispersant molecules are not negligible and appear to be resistance to dispersion. Thus, it is conceivable that the ultrasonic coating disperser removes the solvent in this process, or extracts the solvent at a later stage of dispersion, which is inevitably advantageous for dispersion. After the competition of the solvent is excluded, even if the contact area is increased, even if hydrogen bonding and polarization cannot be formed between the coating particles and the dispersant molecules, a firm anchoring effect can be obtained by simply relying on van der Waals force.

The first idea is to place the dispersant in a molten state under heating and directly participate in the grinding. This is directly bonded by the dispersant molecules replacing the air molecules adsorbed on the surface of the coating particles. The advantage of this idea is that the energy consumption is low and the efficiency is high. The disadvantage is that the viscosity of the dispersant in the molten state cannot be too large, which requires that the dispersant of the ultrasonic coating disperser should not be too high in molecular mass. Another idea is that there is solvent participation in the early stage, because the solvent can make the paint particles easier to be wetted, that is, the air molecules on the surface of the paint particles are replaced by solvent molecules, and then heated or negative pressure or heated to add negative pressure, so that the solvent evaporates. Promotes tight bonding of coating particles and dispersant molecules. The advantage of this idea is that it is suitable for most dispersants. The disadvantage is that the volatile solvent consumes a lot of energy.