Лако-красочные материалы — производство

Iron blue pigments are produced by the precipitation of complex iron(II) cyanides using iron(II) salts in aqueous solution. The product is a whitish precipitate of iron(II) hexacyanoferrate(II) MII2FeII[FeII(CN)] or MIIFeII[FeII(CN)6], (Berlin white), which is aged and then oxidized to give the blue pigment [3.176]. Sodium or potassium hexacyanoferrate(II) or mixtures of these salts are used […]

X-ray and infrared spectroscopy show that iron blue pigments have the formula MIFeIIFeIII(CN)6 • x H2O [3.171]. MI represents sodium, potassium or ammonium, ofwhich potassium and ammonium ions are preferred in industrial manufacture be­cause they produce excellent hues; ammonium is the most common one. The crystal structure of the Fen FenI (CN)6 grouping is shown […]

The term iron blue pigment as defined in ISO 2495 has largely replaced a great number of older names (e. g. Paris blue, Prussian blue, Berlin blue, Milori blue, Turnbull’s blue, toning blue, and nonbronze blue). These names usually stood for insoluble pigments based on microcrystalline Fe(II)Fe(III) cyano complexes; many were associated with specific hues. […]

Ultramarines can be categorized as either laundry grades, which are low-strength and sometimes low-purity materials, or as industrial/technical grades, which are high-strength, high-purity pigments. Factories in the People’s Republic of China, and India produce on the whole laun­dry grade materials. There are only three major producers of high-grade ultramarine pigments — Holliday Pigments (United Kingdom, […]

Ultramarine pigments have a unique safety record. No other pigment has had such long term and widespread human and environmental exposure without any reported instances of ill effect. The principle uses for ultramarine in earlier times constituted a world wide test of human safety since it was sold and used around the world as an […]

Ultramarine pigments are widely used in plastics and surface coatings for toys, chil­dren’s paints and finger paints, modeling compositions, colored paper, crayons etc. They comply with major regulations and standards. 3.5.5

This traditional use for ultramarine in all types of media is still an important appli­cation. Unique color properties, stability, and safety are highly prized. 144 I 3 Colored Pigments 3.5.4.8

Ultramarine pigments are widely used in cosmetics. Pink is not recommended for toilet soaps because of a color shift to violet. Advantages are complete safety, non­staining and conformance to all major regulations. 3.5.4.7

Ultramarine pigments are widely used to enhance the effects of optical brightening agents in improving the whiteness of laundered fabrics [3.168]. They do not stain or build up with repeated use. 3.5.4.6

Ultramarine pigments are used to enhance the hue of white paper or for colored paper. They can be added directly to the paper pulp, or used in applied coatings. They are particularly suitable for colored paper for children’s use.