Articles
STUDY OF CONDITIONS FOR COTTON DYEING WITH COCHINEAL
Article number
811_30
Pages
241 – 246
Language
English
Abstract
The textile industry uses a great variety of synthetic dyes, most of them being mutagenic and carcinogen agents.
For this reason, they are considered a threat to public health in addition to environmental pollutants.
Nowadays, it is tempting to replace such dyes by natural products.
One exceptional substitute of the synthetic colourings used in the textile industry is the Carminic acid, which is obtained from cochineal (Dactylopius coccus Costa). Its excellent stability against the light and heat, and the changes of color to different values of pH, make it an attractive colorant for being used in the dyeing processes.
Current scientific articles mention that cotton products that are dyed with natural colorants are considered highly effective to protect the skin from ultraviolet rays.
The purpose of this work is to propose a good alternative to the textile area, on the process of cotton dyeing with cochineal.
For this, a study of the best conditions of the dyeing process has been performed, by means of statistical analysis, which includes variation of reactive concentrations in the color fixation stages.
To verify the stability in dyeing, a test was done to check the colour fastness to rubbing by means of a Crockmeter.
The color of the dyed fabric was taken as a variable of measuring, before and after of the stability test and determined through a colorimeter.
The results show the concentration of the mordents affects the final hue in the cotton, besides the stability of the color in cotton.
For this reason, they are considered a threat to public health in addition to environmental pollutants.
Nowadays, it is tempting to replace such dyes by natural products.
One exceptional substitute of the synthetic colourings used in the textile industry is the Carminic acid, which is obtained from cochineal (Dactylopius coccus Costa). Its excellent stability against the light and heat, and the changes of color to different values of pH, make it an attractive colorant for being used in the dyeing processes.
Current scientific articles mention that cotton products that are dyed with natural colorants are considered highly effective to protect the skin from ultraviolet rays.
The purpose of this work is to propose a good alternative to the textile area, on the process of cotton dyeing with cochineal.
For this, a study of the best conditions of the dyeing process has been performed, by means of statistical analysis, which includes variation of reactive concentrations in the color fixation stages.
To verify the stability in dyeing, a test was done to check the colour fastness to rubbing by means of a Crockmeter.
The color of the dyed fabric was taken as a variable of measuring, before and after of the stability test and determined through a colorimeter.
The results show the concentration of the mordents affects the final hue in the cotton, besides the stability of the color in cotton.
Authors
G. Arroyo Figueroa, L. Vargas Rodríguez, G. González Sánchez
Keywords
color stability, Dactylopius coccus Costa, natural dye, textile dye, carminic acid
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