Textile coloration with supercritical fluid of carbon dioxide (SCF-CO) has become an advisable choice in textile industry, due to its numerous environmental advantages over the conventional methods. However, the coloration of dry cotton substrate in SCF-CO is still under research. Thus, this work aims to investigate the coloration performance of dry cotton fiber which was previously treated with a novel method by utilizing a flash explosion in the mixed fluids of subSCF-CO and vapor to modify its supermolecular structure. The influences of coloration parameters, such as system temperature, pressure, dosage of dye, and coloration duration on the uptake and fixation behaviors of reactive disperse yellow SCF-AY02 dye on the flashily-exploded cotton substrate were explored. The experimental results show that the flash explosion with the mixed fluids can significantly improve cotton dyeability in SCF-CO, and the system temperature and pressure had more pronounced effects on the quantitative adsorption amount and the fixation efficiency of the SCF-AY02 dye than other parameters on the flashily-exploded cotton substrate. Moreover, a fast improvement in the dye uptake behaviors was also observed within a relative short duration from 30 min to 60 min. Furthermore, the improved dyeability of the flashily-exploded cotton in SCF-CO was further validated and supported by the investigations of its morphological and chemical structures with scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FT-IR) and wide-angle X-Ray Diffraction (XRD) analysis. Additionally, a comparable value or very slight alteration in the tensile strength of the flashily-exploded fiber was also achieved in comparison with the control one. It is hopeful that this novel flash-explosion technology with the mixed fluids potentially benefits and can be widely employed to enhance the coloration performances of different natural and/or synthetic fibers in SCF-CO in a dry and physical modification way.

中文翻译：

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亚超临界二氧化碳和蒸气混合物闪爆后棉纤维的超临界着色性能

超临界二氧化碳流体（SCF-CO）对纺织品染色已成为纺织工业的明智选择，因为它比传统方法具有许多环境优势。然而，干棉基质在 SCF-CO 中的着色仍在研究中。因此，本工作旨在研究干燥棉纤维的着色性能，该干燥棉纤维之前经过一种新方法处理，利用 subSCF-CO 和蒸汽的混合流体中的闪爆来改变其超分子结构。探讨了系统温度、压力、染料用量、着色时间等着色参数对活性分散黄SCF-AY02染料在闪爆棉基材上的上染固色行为的影响。实验结果表明，混合流体闪爆可显着提高SCF-CO中棉纱的染色性能，且系统温度和压力对SCF-AY02染料的定量吸附量和固色效率影响较其他参数更为显着。在突然爆炸的棉质基材上。此外，在 30 分钟至 60 分钟的相对较短的时间内，还观察到染料吸收行为的快速改善。此外，通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）和广角对其形态和化学结构的研究，进一步验证和支持了SCF-CO中闪爆棉改善的染色性。 X 射线衍射 (XRD) 分析。此外，与对照纤维相比，闪爆纤维的拉伸强度也达到了相当的值或非常轻微的变化。希望这种新型的混合流体闪爆技术具有潜在的好处，并可以广泛应用于以干法和物理改性的方式增强SCF-CO中不同天然和/或合成纤维的着色性能。