Optimization of extraction and dyeing parameters of Lac dye from Kerria chinensis (Mahd.) on cotton

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dc.contributor.advisorBoruah, Rickey Rani
dc.contributor.authorBaruah, Sourav
dc.date.accessioned2024-01-12T11:50:28Z
dc.date.available2024-01-12T11:50:28Z
dc.date.issued2021
dc.description.abstractThe present investigation entitled "Optimization of extraction and dyeing parameters of Lac dye from Kerria chinensis(Mahd.) on cotton”was conducted during the year 2019-21.In this study dyeing of cotton was done using Lac dye from species K. Chinensiswith the following objectives. 1. Standardization (optimization) of extraction and dyeing parameters of Lac dye. 2. Evaluation of the colour fastness properties of dyed cotton yarn. Natural dyes are emerging globally as eco-friendly colourant. The greater part of natural dye is vegetable dye obtained from plant source but there are dyes also obtained from insects e.g., Lac Dye. Lac is an animal originated insect dye which is found in India. They can also produce variety shades of colour. During the investigation,HCI, water and Na2CO3were used for acidic, aqueous and alkaline extraction method respectively. Result showed that the optimum extraction was 10% for each medium at 60°C for 60 minutes, 90°C for 100 minutes and 40°C for 75 minutes in acidic, aqueous and alkaline medium respectively. The natural colourant extracted from Lac insect (Kerria chinensis), was utilized for colouration of cotton yarn and their dyeing properties were investigated. Four different mordants such as alum, myrobalan, aluminium sulphate and ferrous sulphate were used on cotton yarns at different concentrations with pre, simultaneous and post-mordanting method to assess the colour fastness properties of the dyed samples. Results showed that, mordant has a significant effect on the colour of yarns and fastness properties were influenced by the type of mordants used. Lac dye showed burgundy to purple colour with mordant alum and orange to red orange colour with mordant aluminium sulphate, faded red in mordant myrobalan and ferrous sulphate shows dark grey colour on cotton yarn in different medium. Alum mordant showed more excellence in physical properties of dyed yarn while aluminium sulphate shows more excellence in colour fastness. Dyed cotton yarn exhibited the best colour fastness range from very fair to good with aluminium sulphate mordant. The cotton yarn samples dyed with alum was found to be better than myrobalan, aluminium sulphate, and ferrous sulphate in respect of tenacity (g/tex), wicking height (cm) and moisture regain (%). Cotton yarn samples mordanted with myrobalan showed highest density, wicking height and moisture regain. The myrobalan mordanted dyed cotton yarn showed highest tenacity and elongation.
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810206215
dc.language.isoEnglish
dc.subTextile and Apparel Designing
dc.themeOptimization of extraction and dyeing parameters of Lac dye from Kerria chinensis (Mahd.) on cotton
dc.these.typeM.Sc
dc.titleOptimization of extraction and dyeing parameters of Lac dye from Kerria chinensis (Mahd.) on cotton
dc.typeThesis
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