The Research And Application Of Dichloromethane Extracting The Disperse Dyes From Polyester

Polyester is difficult to dye in general because of its stable physical and chemicalproperties except dyeing with disperse dyes; but the disperse dye is bond tightly withPolyester that need to be separated by appropriate organic solvent in certainly physical andchemical conditions. This subject is to research the feasibility and related physicalconditions of dichloromethane extracting Polyester disperse dyes in order to replacechlorobenzene and dimethylbenzene which are adopted as solvent in the national standardGB/T17592-2011.The paper uses comparison test by multiple methods and multiple samples to researchthe feasibility and related physical conditions of dichloromethane extracting disperse dyeson Polyester. The experimental results show that the best physical conditions fordichloromethane to extract the disperse dyes on Polyester is ultrasonic oscillation, theextraction time is30min and the distillation separation temperature is55℃.Using dichloromethane, chlorobenzene and dimethylbenzene which the latter twokinds of solvent which are adopted as solvent in the national standard GB/T17592-2011Textiles-Determinnaotion of the banned azo colourants, three different kinds of organicsolvents to extract disperse dyes, and testing the absorbance of organic solvent afterextracting disperse dyes and the difference of weight of the samples. The results show thatthe extraction rate of dichloromethane is equal or even slightly higher thanchlorobenzene and dimethylbenzene when as solvent to extract disperse dyes on Polyester.The experiments are carried out in accordance with the national standard GB/T17592-2011Textiles-Determinnaotion of the banned azo colourants and GB/T23344-2009Textile-Determination of4-aminoazobenzene that using dichloromethane, chlorobenzeneand dimethylbenzene to extract the same positive samples containing carcinogenicaromatic amine, the results of experiment indicated that the error of three methods is within5%, the extraction condition of dichloromethane is more simple than other organicsolvents, the energy consumption of the experiment is lower and dichloromethane is muchless toxic than chlorobenzene and dimethylbenzene.