Лако-красочные материалы — производство

All commercial bismuth vanadate pigments are based on pure bismuth vanadate with monoclinic or tetragonal structure. The most important properties of all bismuth vanadate pigments are

— Excellent brightness of shade

— Very good hiding power

— High tinting strength

— Very good weather fastness

— High chemical resistance

— Easy dispersibility

— Environmentally friendly

In the following the physical and coloristic properties of a pure bismuth vanadate pigment are given (Sicopal® Yellow L 1100, BASF):

Density 5.6 g cm-3

Refractive index n 2.45

Specific surface area (BET) 10 m2 g-1 Oil absorption 27 g/100 g of pigment

Bismuth vanadate is a pigment with a greenish yellow shade. When compared with other yellow inorganic pigments, it most closely resembles cadmium yellow and chrome yellow in its coloristic properties (Figure 3.10).

Bismuth vanadate shows a sharp increase in reflection at 450 nm and considerably higher chroma than iron yellow or nickel titanium yellow. It has very good weather resistance both in full shade and in combination with TiO2. General pigment prop­erties are:

3.3.3