Читать книгу Additives for Water-borne Coatings - Wernfried Heilen - Страница 29

Pigment concentrates, which are used in architectural coatings, can be divided into several groups. Firstly, there are mass-tones and tinting colorants. These are coloured emulsion paints which can be used alone as a full shade or used to tint white base paints and have a relatively low pigment content. They contain binder and small amounts of fatty acid ethoxylates as wetting and dispersing additives.

The second group comprises the binder-free tinters. They contain larger amounts of fatty acid derivatives and are used to tint white base paints or for colour corrections.

This market segment also includes high performance pigment concentrates which contain acrylic- or maleic-anhydride copolymers and which, because of their high price, are used only when essential, for example, in facade coatings with strong beading effects or silicate paints because they have a high pH.

So called universal colorants are widely used in architectural coatings. These aqueous pigment concentrates can be used in water-borne emulsion paints as well as in solvent-based alkyd lacquers. Alkyl phenol ethoxylates can be used to formulate universal colorants. Because of environmental concerns, alternatives such as fatty acid derivatives (Guerbet derivatives) and modified polyethers are used.