Natural anthraquinonoid colorants as platform chemicals in the synthesis of sustainable disperse dyes for polyesters
作者:Ioannis Drivas、Richard S. Blackburn、Christopher M. Rayner
DOI:10.1016/j.dyepig.2010.04.009
日期:2011.1
Natural anthraquinonoid dyes (alizarin and purpurm) were used as platform chemicals to synthesise sustainable alternatives to existing synthetic dyes by alkylation of hydroxy groups in the 1- and 2-positions. In comparison with the parent compounds, the derivatised dyes were insensitive to pH change. insoluble in alkali and the Lambda(max) for the mono-alkylated derivatives was unchanged and that of the bis-alkylated derivatives was reduced by 53-54 nm Melting points decreased with derivatisation as the ability of the dyes to form inter-molecular interactions decreased. Dye exhaustion and colour strength values for dyeings on PET were relatively high for the parent and mono-alkylated derivatives and lower for the larger bis-alkylated derivatives Mono-alkylation with methyl-4-butanoate groups improved the dyeing properties of the dyes on PIA. All dyeings displayed excellent wash fastness and the light fastness was improved in the case of the mono-alkylated derivatives owing to the removal of the photo-sensitive 2-hydroxy group (C) 2010 Elsevier Ltd. All rights reserved
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