Evaluation of the dyeing mechanism of an acid dye on protein fibers in supercritical CO_2

摘要

The dyeing mechanism of an acid dye on protein libers in supercritical CO_2 has been investigated.The reverse micellar system comprising pentaethylene glycol n-octyl ether (C_8E_5) 1-pentanol has been applied for the solubili/ation of an acid dye and the subsequent dyeing of protein libers in supercritical CO_2.Quantitative measurements of the concentrated dye fluid in supercritical CO_2 could be achieved by the application of integrated Lambert -Beer method.It has been found that the differences of the pressure in the system have great influence on the molar extinction coefficient (epsilon) of an acid dye solubilized in the interior of the reverse micelle in supercritical CO_2.Adsorption manner of an acid dye on protein libers in supercritical CO_2 was similar to that in an aqueous system and followed a Langmuir manner.