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Monday, 16 September 2019
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Raw materials & technologies, Raw materials, Coatings pigments

Determining colouristic properties in blue effect coatings

Monday, 5 December 2011

Blue effect coatings produced by using different silver-white effect pigments can be characterised by their optical properties.

Determining colouristic properties in blue effect coatings Source: Merck KGaA

Determining colouristic properties in blue effect coatings Source: Merck KGaA

Effect pigments have been used in automotive coatings for decades. Only recently new measurement devices have been developed for the quantitative characterisation of their appearance. Both the colouristic values and texture of coatings have to be monitored in daily QC monitoring. This involves the validation of chroma under different angles and the quantification of sparkle (also called glint impression) and graininess (or diffuse coarseness) respectively. The possibility of variation due to evaluation by differing personnel during visual assessment can be reduced by the use of standardized anchor panels as a comparison or by a transfer to physical measuring equipment.
Dr. Thomas Rentschler,Merck KGaA, shows in the today published EUROPEAN COATINGS JOURNAL issue that small particles are stronger disoriented than larger ones. The disorientation from parallel alignment increases with increasing pigment concentration.
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