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Polymer surfactants can be used as pigment dispersants
Polymer surfactants have good dispersing effect on pigments (fillers) in water and solvents. Some people call them hyperdispersants. It consists of two parts, some of which are polar groups such as NR2, NR3, and COOH. , S03H, polyamines, polyols and polyethers, etc. These polar groups are tightly adsorbed on the pigment surface by ionic bonds, hydrogen bonds and van der Waals forces to prevent desorption; the other part is solvated chains, and dispersion The medium has good compatibility, which can greatly reduce the interfacial tension between the pigment particles and the dispersion medium, and can also form a space barrier on the pigment surface to maintain the stability of the dispersion system. In order to increase the speed and save energy, high solid content coatings are required, and polymer surfactant dispersants such as sodium polyacrylate (Dispex N-40, Polysah S, SP-61, DC-854) are commonly used. Poly(sodium methacrylate) and its derivatives, disodium salt of maleic anhydride diisobutylene copolymer, and alkyl phenol polyoxyethylene ether (OP type product), fatty alcohol polyoxyethylene ether (OS type) and the like.