TEA WASTE EXTRACTS AS A SOURCE OF DYE FOR SILK AND WOOL
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Date
1999
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Professor Jayashankar Telangana State Agricultural University
Abstract
Priortotheinventionofsyntheticdyesallcolouringmatterwereextractedfrom naturallyoccurringcolouredmaterial.Thedemandforuseofnaturaldyesontextiles hasbeenoneoftheconsequencesofincreasedenvironmentalawareness.Worldwide. theuseofnaturaldyesforthecolourationoftextileshasmainlybeenconfinedtocraft, dyersandprinters.However,recentlymoreinterestisbeingshownintheuseofthese dyes.Manyresearchesarebeinginitiatedbyseveralresearchorganizationstocaterto thiseco-friendlymovement.Theavailableliteratureindicatedthattherewasnoprior researchworkonextractionofdyefromteawaste.Hence,thepresentstudywastaken up, to dye silk and wool from teawaste extractandto assessthecolourfastness properties. TheteawastewasprocuredfromthecollegeofHomeSciencehostelwherethe teapreparationwasmonitoredtoobtainhomogeneousproduct. Silkfabricandwool
yamwereselectedforstudy. Acidicmethodofextractionwasfoundtobebestsuited forbothsilkandwool.Alumandmyrobolanweretriedasmordantsasbothwerenontoxic.Myrobolanproducednoconsiderablechangeincolour.Soalumwasselectedas mordant.Twoconcentrationsofalumwerechosenformordantingsilkandwool.Post mordantingmethodwasprovedtobesuitableforsilkandwool.Differentshadesofthe developedcolourswereobtainedonsilkandwool.Thedyedwoolandsilksamples were subjected to colour fastness tests such as washing, sunlight, rubbing and perspiration. I Theresults ofcolour fastness tests ofsilksamples showedthatall the silk samples had excellentfastnessto washing, good tovery good fastness to sunlight, excellentfastnesstowetanddryrubbingandfairtogoodfastnesstoalkalineandacidic perspirationtests.Thefindingsofcolourfastnesstestsofwoolsamplesindicatedthat woolsampleshadfairtogoodfastnesstowashing,excellentfastnesstosunlight,wet and dry rubbing, and acidic and alkaline perspiration. The results of subjective evaluationindicatedthatthecoloursobtainedweregoodandthatteawasteisasuitable dyefordyeingsilkandwool.Thecostestimationofdyeingprocessofsilkandwool samplesindicatedthat15percentalummordantedsilkandwoolsamples incurred highercostandtheunmordantedsamplesweredyedatzeroexpenseasnochemicalwas used.
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D5915