The Influence of Mordanting on the Dyeability of Cotton Dyed with Turmeric Extract

Abstract

The dyeability of cotton fabric with turmeric extract in two concentrations (pale and dark dyeing) was studied using four diff erent mordants in low concentration (0.2 g/l). As mordants three metal salts were used as mordants (ferrous sulphate, aluminium sulphate and zinc chloride), and organic mordant tannin. The mordanting of cotton was performed before, during and after dyeing, namely by pre-, meta-, and post-mordanting application methods. Colour fastness of dyed samples to repetitive washing and hot pressing was also performed. The colour values of the dyed samples were measured on a refl ectance spectrophotometer. The results showed that the dyeability of the cotton with turmeric extract is greatly infl uenced by the used mordant and its application method. The highest dyeing uptake (dyeability) was achieved by pre-mordanting with aluminium sulphate. All the mordanted samples had improved colour fastness, especially those samples meta-mordanted with ferrous sulphate. Keywords: cotton, turmeric, curcuma, mordant, natural dyeing, dyeability Izvleček V raziskavi je bil proučevan vpliv čimžanja z uporabo štirih čimž v nizki koncentraciji (0,2 g/l) na obarvljivost bombažne tkanine z ekstraktom kurkume v dveh koncentracijah (za svetlo in temno obarvanje

The influence of after-treatments on dyeability of raw and bleached cotton with curcumin, and visibility of anthotype produced motifs

“…Tega tekstilijam spreminjamo predvsem z uporabo kovinskih soli oziroma kovinskih ionov. Te lahko nanašamo na tekstil pred barvanjem, med njim ali po njem, vendar mnogi niso ekološko sprejemljivi [3][4][5]. Med raziskovanjem naravnih barvil so ugotovili, da so ta občutljiva na sončno svetlobo in je tako fotografa, kemika, fi zika in botanika Sira Johna Fredericka Williama Herschela obširna raziskava naravnih barvil ob izpostavitvi sončni svetlobi pripeljala do fotografskega procesa razvijanja fotografi j, ki se imenuje antotipija (angl.…”

“…Kovinski ioni tvorijo komplekse med barvilom in tekstilijo, kar omogoča boljše vezanje barvila na vlakna [14]. Poleg tega pa z uporabo različnih kovinskih soli pri barvanju z istim naravnim barvilom dosežemo različne barvne odtenke pobarvane tekstilije [3,6,8]. Ker je bila tehnika antotipije do zdaj uporabljena le na papirju, je bil namen raziskave uporabiti to tehniko na tekstilnem substratu oziroma na bombažu.…”

“…Pri barvanju z naravnimi barvili mineralne snovi v trdi vodi ne motijo barvalnega procesa, kot je to primer pri barvanju s sintetičnimi barvili, temveč delujejo sinergistično. Posledica obdelave s kovinskimi solmi pa so predvsem temnejša obarvanja bombažne tkanine z barvilom kurkume [3]. Trdoto vode smo analizirali in ugotovili, da je voda sred nje trda (10.01 °d) in vsebuje 1,44 mmol/l Ca ionov in 0,43 mmol/l Mg ionov (preglednica 3).…”

“…Energija fotonov, ki jo absorbira fotoobčutljiva molekula, spremeni konfiguracijo elek tronov v molekuli kurkumina in ustvari visokoenergetske oblike kisika, ki reagira z organsko snovjo in postopoma zbeli komponente barvila. Iz literature vemo, da obdelava s kovinskimi solmi vpliva na izboljšanje obstojnosti na svetlobi [3,8,22]. Trdota vode ni vplivala na obstojnost na svetlobi barvanih vzorcev (preglednica 4).…”

Adsorption Kinetics of Curcumin on Cotton Fabric

“…It is rich in curcuminoids and belongs to the diaroylmethane group called diferuloylemethane [8]. Th e active colouring component in turmeric rhizome is curcumin, also called Natural Yellow 3 with the colour index number 75300 [9]. Th is dye is not only environment friendly…”