Extraction of berberine dye and its dyeing behavior on nylon 6 fabric

The water extraction technology was applied to extract berberine from Coptis chinensis Franch.The extracts were used to dye nylon 6.The basic performance of the extracts and the effect of dyeing temperature,value of pH and sodium sulfate dosage on K/S value of the dyeings were analyzed.The build-up property,absorption performance and color fastness of berberine on nylon 6 were also investigated.It was found that high yield was obtained by primary water extraction and the basic component of extracts was berberine.The K/S value of the dyeings was decreased with the increase of dyeing temperature,but increased with the increase in dyeing pH.Sodium sulfate had certain retarding effect during dyeing.The up-take rate of berberine on nylon 6 at high temperature is much faster than that at low temperature.The absorption of berberine on nylon 6 is fitted to Langmuir equation.All color fastness of the dyed fabrics after fixation is above rating 3.