Rendering Viscose Fabrics Dye-able with Basic and Acid Dyes Using Citric Acid and Chitosan Nano Particles Based Finishing Formulation

ABSTRACT

The innovation anticipated here is the use of our previously prepared chitosan nanoparticles in conjunction with citric acid and sodium hypophosphite for rendering viscose fabrics dyed and finished concurrently in one step with dual classes of dyes, namely basic and acid dyes, using a pad-dry-cure process. This was done to see the effect of the aforementioned eco-friendly finishing formulation on creating dual anchoring sites onto finished fabrics for dye-ability using Basic Red 2 and Acid Orange 7, which have no direct affinity to viscose fabric. So, different concentrations of CA, CNPs, and dyes were mixed into a viscose fabric cross-linking formulation together with a set concentration of SHP (50% based on weight of CA concentration) and cured at 170°C for 2 minutes. Citric acid is predicted to react with the hydroxyl groups in viscose and CNPs to produce ester crosslinking and/or to form an inter-ionic attraction with the amino groups of CNPs. The latter was responsible for viscose fabrics dye ability with Basic Red 2 by anchoring the free carboxyl groups in citric acid, as well as their dye ability with Acid Orange 7 by anchoring the residual amine groups in CNPs.

摘要

这里预期的创新是使用我们先前制备的壳聚糖纳米颗粒与柠檬酸和次磷酸钠结合, 使粘胶织物使用两类染料 (即碱性染料和酸性染料) 同时进行染色和整理, 使用垫干固化工艺. 这样做是为了观察上述环保整理配方对使用碱性红2和酸性橙7在成品织物上创建双锚定点以提高染色能力的效果, 碱性红2和酸性橙7与粘胶织物没有直接亲和力. 因此, 将不同浓度的CA, CNPs和染料与设定浓度的SHP (基于CA浓度重量的50%) 混合到粘胶织物交联配方中, 并在1700°C下固化2分钟. 预计柠檬酸会与粘胶和CNPs中的羟基反应, 产生酯交联和/或与CNPs的氨基形成离子间吸引. 后者通过在柠檬酸中锚定游离羧基来实现粘胶织物对碱性红2的染色能力, 以及通过在CNPs中锚定残留胺基来实现粘胶织物对酸性橙7的染色能力.

KEYWORDS:

• Viscose fabric
• chitosan nanoparticles
• concurrent dyeing and finishing
• color strength
• fastness properties

关键词:

• 粘胶纤维织物
• 壳聚糖纳米颗粒
• 同时染整
• 颜色强度
• 牢度特性

Acknowledgments

The authors wish to express deepest thanks and appreciation for National Institute for Standards for the facilities provided.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplementary material

Supplemental data for this article can be accessed online at https://doi.org/10.1080/15440478.2022.2086661

Additional information

Funding

The authors have no funding to report.