The molecular structure of traditional hyperdispersants (surfactants) contains two groups that are opposite in solubility and polarity, one of which is a shorter polar group called a hydrophilic group. Its molecular structure characteristics make it easy to orient and arrange on the surface of the substance or at the interface between two phases, reducing interfacial tension and having a good dispersion effect on aqueous dispersion systems.
However, its molecular structure has certain limitations: hydrophilic groups are not firmly bound to the surface of particles with low or non-polar polarity, which can easily desorb and lead to the re coagulation of dispersed ions; The lipophilic group does not have sufficient carbon chain length (generally not exceeding 18 carbon atoms), and cannot generate sufficient steric hindrance effect to stabilize in non-aqueous dispersion systems.
In order to overcome the limitations of traditional dispersants in non-aqueous dispersion systems, a new type of super dispersant has been developed, which has a unique dispersion effect on non-aqueous systems. Its main characteristics are: quickly and fully wetting particles, shortening the grinding time to achieve qualified particle fineness; It can significantly increase the solid particle content in the grinding base material, saving processing equipment and energy consumption; Uniform dispersion and good stability significantly improve the final performance of the dispersed system.
The molecular structure of a hyperdispersant is divided into two parts: one part is the anchoring group, commonly including R2N, R3N+, COOH, COO -, SO3H, SO2-, PO42-. Polyamines, polyols, and polyethers can tightly adsorb onto the surface of solid particles through interactions such as ionic bonds, covalent bonds, hydrogen bonds, and van der Waals forces, preventing the hyperdispersant from desorbing; The other part is the solvation chain, commonly including polyester, polyether, polyolefin, and polyacrylate, which can be divided into three types according to polarity: low polarity polyolefin chain; Medium polarity polyester chains or polyacrylate chains, etc; Strongly polar polyether chains. In a polar matched dispersion medium, the solvation chain has good compatibility with the dispersion medium, adopting a relatively extended conformation in the dispersion medium and forming a sufficiently thick protective layer on the surface of solid particles.
