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Analysis of impurities in pigments

Authors: Fischer Jan | Kulhavá Ivana | Vilišová Petra | Česla Petr | Česlová Lenka

Year: 2017

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Analysis of impurities in pigments	This work is focused on analysis of impurities in Yellow monoazo pigments which are frequently used throughout paints industry. However, they bleed and bloom considerably in most polymer systems, therefore, their using in coloration of plastics is strongly limited. This can be overcome by introducing acidic substituents into the basic structure of pigment and by converting the material into a lake by salt formation. Such pigment lakes exhibit particularly good migration resistance and heat stability, making them useful colorants for plastics. The pigments are relatively non-toxic, however, their intermediates belonging to the group of primary aromatic amines has higher toxicity. Therefore, it is very important to monitor the intermediates in the final pigment product due to the toxicological and ecological point of view. In this work, residual intermediates as the potential impurities in two monoazo yellow pigments (P.Y. 1 and P.Y. 74) and one yellow pigment lake (P.Y. 191) were analyzed using reversed-phase high performance liquid chromatography on octadecylsilica gel column with methanol/phosphate buffer mobile phase. The 6-amino-4-chlorotoluene-3-sulphonic acid was found as the impurity in P.Y. 191; aniline, acetanilide and acetoacetanilide as the impurities in P.Y. 1 and o-anisidine, acet-o-anisidide and acetoacet-o-anisidide as the impurities in P.Y. 74. Different extraction protocols for extraction of components of interest from raw pigments were used. Results obtained by each extraction method were compared and discussed. Long term stability of extracts was compared.	pigments, P.Y. 1, P.Y. 74, RP-HPLC