Characterization and optimization of dyeing process parameters on cotton fabrics with ipomea batatas crude leaf extract.

Abstract

This dissertation reports a project aimed at extracting a natural dye from Ipomea batatas leaves and optimization of the dyeing process parameters, thus temperature, time, mordant, and dye concentration. Aqueous extraction method was used to obtain a crude dye solution from the dried pulverized Ipomea batatas leaves because of its eco friendliness, the high yield of the dye and its inability to degrade the bioactive compound. Tests were carried out to identify the bio active compounds. Ferric chloride test identified anthocyanins (responsible for color), Fourier Transform Infrared Spectroscopy (FTIR) identified the functional groups, Ultra Violet Visible Spectroscopy (UVVS) measured anthocyanins and the pH was analyzed. The cotton fabrics were dyed using a dye bath for the different experiments (31) and dyeing process parameters were optimized using Response Surface Methodology which gave optimum values as (62.9113 ℃, 55.7053minutes, 96.5212g, and 1.2313g): temperature, time, concentration and mordant respectively. The fabrics were dyed with optimum parameters then evaluated for color fastness to perspiration and rubbing. Dyed cotton fabrics had a brown shade with well acceptable limits (4) for dry and wet rubbing and (4-5, 4) for acidic and alkaline perspiration respectively which aimed at commercial textile applications.