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Analysis of Impurities in Monoazo Yellow Pigments
Authors: Fischer Jan | Kulhavá Ivana | Vilišová Petra | Česla Petr
Year: 2015
Type of publication: ostatní - článek ve sborníku
Name of source: 10th Balaton Symposium on High-Performance Separation Methods: Book of Abstracts.
Publisher name: Sciences
Place: Veszprém
Page from-to: nestránkováno
Titles:
Language Name Abstract Keywords
eng Analysis of Impurities in Monoazo Yellow Pigments Yellow monoazo pigments or their metal salts (pigment lakes) represent important groups of yellow pigments. The largest fraction of monoazo yellow pigments today are used throughout paints industry. On the other hand, strong migration tendencies practically exclude these pigments from being used for the mass coloration of plastics: they bleed and bloom considerably in most polymer systems. 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. From toxicological and ecological point of view, it is very important to monitor the manufacturing intermediates in the final pigment product: while pigments are relatively non-toxic, much more toxic and hazardous are their intermediates belonging to the group of primary aromatic amines. 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 analysed and determined, namely 2B acid (6-amino-4-chlorotoluene-3-sulphonic acid) as the impurity in P.Y. 191, aniline, acetanilide and acetoacetanilide ast 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 and the obtained extracts were analysed by HPLC technique using octadecylsilica gel column and methanol/phosphate buffer mobile phase. Results obtained by each extraction method were compared and discussed. Long term stability of extracts was compared.

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