Читать книгу Additives for Water-borne Coatings - Wernfried Heilen - Страница 22

Polyacrylate salts are not suitable for stabilising organic pigments. Fatty acid derivatives are a group of simple compounds which stabilise pigments. Fatty acids have structures which will also anchor to organic and carbon black pigments. The hydrophilic part consists of a polyether chain. Fatty acid ethoxylates are excellent emulsifiers and allow the production of very compatible pigment grinds. As with polyacrylate salts, the water resistance of coatings containing fatty acid derivatives is limited. Fatty acid derivatives differ from polyacrylate salts in that they can be used to produce pigment concentrates.

In many regions, fatty acid ethoxylates are combined with polyacrylate salts to make mill bases for emulsion paints. They also help to stabilise the binder systems.

Figure 2.6b: Structural example of a glycerol fatty acid ethoxylate