Dyeing of Nylon 66 Woven Fabric Using Bromophenol Blue and Color Change in Acidic Solution
Vol. 56, No. 4, pp. 235-241,
Aug. 2019
10.12772/TSE.2019.56.235
PDF
Abstract
Acid compounds, which are widely used in industry, are colorless and have difficulty
in detecting when leaked by accident. In order to solve this problem, several
researches on acid gas detection have been carried out, but there have been few studies
on acid liquid (or solvent) detection with chemosensors. A chemosensor using halochromic
dye can provide a simple and easy detecting method by exhibiting different color
when it is exposed by acid liquid. In this study, bromophenol blue was selected as a pHindicating
dye for detecting acid liquid. Nylon 66 woven fabric was dyed with bromophenol
blue and dyeing properties were investigated. pH sensing property was also investigated
by dipping the dyed nylon fabric in acidic solution. At pH 2, bromophenol blue in
aqueous solution showed maximum absorption at 437 nm with yellow color while, at the
pH above 5, maximum absorption was changed to 591 nm with blue color. Bromophenol
blue showed good color yield (K/S) on nylon 66 and dyeing property was dependent on
dyeing pH as well as dye concentration. When the dyed sample was immersed at pH 2.5−
4.0 acidic solution, its original blue color was maintained. However, its color markedly
turned to green and yellow when immersed at pH 2.0 and 1.5 solution, respectively. Wash
and water fastness of the dyed fabric was moderate to very good. Fixing agent treatment
only resulted in adverse effects such as wide pH range for color changing and poor fastness
properties.
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