Microwave extraction of natural dye from camphor leaves and its dyeing on wool fabric

Microwave extraction conditions for natural dye from camphor leaves and the dyeing conditions on wool fabrics with resulting extract were optimized.Factors exerting influence on extraction results such as NaOH concentration,microwave power,extraction time,and factors exerting influence on dyeing results on wool fabrics such as dyeing pH value,dyeing temperature,dyeing time,Na2SO4 concentration were discussed.It was found that the optimum conditions for the extraction were as follows: NaOH 0.25 mol/L,microwave power 595 W,extraction time 11 min,solid to liquid 1∶20.The optimum conditions for the dyeing on wool fabrics were as follows: pH value 5.00,dyeing temperature 100 ℃,dyeing time 60min,bath ratio 1∶50.The dyed wool fabrics with resulting extract had definite fastness and the fastnesses properties could be improved by mordanting.