IMPROVING OPTICAL BRIGHTNESS OF CELLULOSIC TEXTILES WITH BETA – CYCLODEXTRIN

Author (s) : M.Varanya Devi & T.Sindhuja

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Abstract :
Optical brighteners (sometimes called optical bleaches or fluorescent whitening agents) are fluorescent white dyes that absorb ultraviolet region (340 – 370 nm), light of electromagnetic region emit back visible blue light region (420 – 470 nm). This property makes optical brightener effective at masking any yellowing that may be present in cotton fabric. Because the main use of these dyes in laundry detergents and Textile finishing, Optical Brightener is generally found in domestic waste waters that have a component of laundry effluent. They are used on a variety of finishing processes and should be compatible with practically all chemicals and auxiliaries used at different stages. Furthermore, all round fastness property and is good yield are the desired properties expected from optical brightness. In addition to this, different shades of whites are desired, as white shades are subject to fashion trends. Optical brighteners are colourless to weakly coloured organic compounds that, in solution or applied to a substrate, absorb ultraviolet light and re-emit most of the absorbed energy as blue-violet light between 400 and 500 nm. These compounds are included in commercial detergents formulation in order to increase whiteness and intensifying the colours. The aim of this work was to study several industrial situations related with colour changes after domestic washing. In order to achieve that, the effect of optical brighteners on white and coloured textiles was considered.

Keywords : Optical Brightener, Cellulosic Textiles, beta-Cyclodextrin

Conference Date : 17/09/2021

Pages : 284

Paper ID : IESMDT282