Dyeing of Nylon 66 Woven Fabric Using Bromocresol Purple and Color Change in Acidic Solution
Vol. 58, No. 1, pp. 56-64,
Feb. 2021
10.12772/TSE.2021.58.056
PDF
Abstract
Strong acids, such as hydrochloric acid and sulfuric acid, are colorless and difficult
to detect when leaked by accident. A chemosensor using a halochromic dye can serve
as a simple and easy detection method by exhibiting different colors when exposed to
acidic liquids. In this study, bromocresol purple was used as a pH-indicating dye for detecting
acidic liquids. Nylon 66 woven fabric was dyed with bromocresol purple, and the dyeing
properties were investigated. The pH-sensing property was also investigated by
dipping the dyed nylon fabric in an acidic solution. Bromocresol purple in an aqueous solution
showed maximum absorption at 433 nm with a yellow color at pH 2-4, and at 589 nm
with a blue color at pH above 6. The color yield (K/S) of bromocresol purple on nylon 66 is
highly dependent on the dyebath pH. When the yellow sample, which was dyed at pH 3 or
less, was immersed in a solution with pH 2-3.5, its original orange color was maintained.
Then, the color turned blue when immersed in a solution with pH 4-5.5. In contrast, olive or
olive green samples were obtained when dyed at pH 4-6. When the sample was immersed
in a solution with pH 2-3.5, the color changed to yellow. The color also changed to blue
when the sample was dipped in a solution with pH 4-5.5. The wash fastness of the fabric
dyed at pH 3-5 ranged from very good to excellent.
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