Читать книгу Additives for Water-borne Coatings - Wernfried Heilen - Страница 71

The requirement for environmentally compliant products and the use of renewable resources are increasingly important in the development of defoamer active ingredients. Vegetable oils consist of triglycerides of saturated or unsaturated fatty acids. The aliphatic backbone makes them very hydrophobic, which places limitations on the range of uses of vegetable oils. Like mineral oils, vegetable oils are used preferably as defoamer raw materials for medium to high PVC architectural paints. In more sensitive applications vegetable oils tend to produce flooding or impair the surface finish of the coating.