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. 2019 Nov 11;9(63):36631-36639.
doi: 10.1039/c9ra05768d.

Application of smectite for textile dyeing and fastness improvement

Jong Sun Jung  1 , Seong Hun Kim  1   2
Affiliations

Application of smectite for textile dyeing and fastness improvement

Jong Sun Jung et al. RSC Adv. .

Abstract

Three smectite-based pigments were prepared by the intercalation of cationic dyes utilizing the ion exchangeability of smectite, and the synthesis results were verified by X-ray diffraction and transmission electron microscopy. The study involved three fabric-dyeing methods: CD using only cationic dyes, SP using only smectite pigments, and ST using smectite post-treatment on fabrics colored with cationic dyes. For each method, dyeability, washing fastness, and colorfastness to artificial-light exposure were assessed by the absorption-to-scattering ratio (K/S), ΔK/S, and changes in color difference. Overall, CD showed high dyeability but low washing fastness and light fastness for all fabrics. In contrast, SP showed low dyeability and small changes in K/S and changes in color difference, representing washing fastness and light fastness, respectively. ST showed good dyeability, indicating that smectite post-treatment had improved both washing fastness and light fastness. Based on these findings, the improved fastness was attributed to dye release from the fabrics colored with the cationic dye during smectite post-treatment, as the dye simultaneously entered the interlayer space between the smectite layers, while coating the fabric surface with smectite.

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Conflict of interest statement

There are no conflicts of interest to declare.

Figures

Scheme 1
Scheme 1. Smectite structure.
Fig. 1
Fig. 1. XRD profiles of smectite and smectite pigments.
Scheme 2
Scheme 2. Smectite interlayer structure showing the interlayer space.
Fig. 2
Fig. 2. TEM images of (a), (e) pure smectite and (b), (f) rhodamine B–; (c), (g) berberine chloride–; and (d), (h) methylene blue–smectite pigments.
Fig. 3
Fig. 3. Transmittances of smectite, dyestuffs, and smectite pigments: (a) pictures and (b) corresponding UV-vis transmittance spectra.
Fig. 4
Fig. 4. K/S spectra and corresponding L*, a*, and b* of cotton fabric colored with cationic dyes by CD, SP, and ST: (a), (d), (g) rhodamine B; (b), (e), (h) berberine chloride n-hydrate; and (c), (f), (i) methylene blue trihydrate.
Fig. 5
Fig. 5. Effects of CD, SP, and ST on fabric colorfastness before and after washing of cotton, silk, and wool fabrics colored with cationic dyes: (a), (d), (g) rhodamine B; (b), (e), (h) berberine chloride n-hydrate; and (c), (f), (i) methylene blue trihydrate.
Scheme 3
Scheme 3. Proposed mechanism by which SP and ST are colored on fabrics.
See this image and copyright information in PMC

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