Bio-enzyme-assisted extraction of orange peel pigments and their cashmere dyeing properties
With the development of science and technology,people's quality of life is constantly improving and at the same time they have higher requirements for quality of life.Natural dyestuffs are non-toxic,non-hazardous and can be used in a wide range of applications,including textile dyeing,textile functional finishing and batteries.Orange peel,a major by-product of the fruit,is non-toxic and non-hazardous and has certain health benefits,but its role is not fully exploited and is mostly regarded as waste.Therefore,it is imperative that waste is recycled to its full potential in line with today's green trends.To broaden the chromatographic and waste recycling purposes,this article uses orange peel as a raw material for extraction and dyeing of wool to improve its dyeing performance as a research object.The maximum absorption wavelength of orange peel extracts was determined by using a UV spectrophotometer to determine the maximum absorption wavelength and the colour family of the dyestuff;the maximum absorption wavelength of the extracts was then used to adjust the concentration of ethanol in the extraction solvent system and to investigate the effect of the enzyme dosage and the enzyme at different temperatures and times on the extraction efficiency;finally,the colour fastness of the cashmere was improved by combining metal mordant,tannin-metal composite mordant,and color fixing treatment of dye-fixing agents.Experiments show thatthe optimum extraction effect of orange peel pigments is achieved and the enzyme on cellulase and pectinase can give full play to their role when the ethanol concentration is 50％,the material-liquid ratio is 1:20,the cellulase and pectinase quality ratio is 2:1,the temperature is 80℃,and the extraction time is 100 min.At the same time,the light fastness of cashmere under the optimal dyeing process can be improved by half grade by using alum dyeing,and the sun fastness of cashmere can be improved to grade 3 or above by using tannin-metal composite mordant and fixing agent M.
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