Читать книгу Additives for Water-borne Coatings - Wernfried Heilen - Страница 20

Polyacrylate salts are simple polymers which stabilise pigments in water-borne paints, mainly emulsion paints. They are characterised by their high acid value, which promotes good anchoring to inorganic pigments. The highly ionic character means that there is a strong tendency to dissociate in water and this allows good electrostatic repulsion, which is associated with outstanding viscosity reduction. Common counter cations are sodium and ammonium. Coatings containing ammonium-neutralised polyacrylates are more resistant to water than sodium-neutralised ones. In general, the water resistance of polyacrylate salts is rather weak.

Figure 2.6a: Structural example of a polyacrylate salt