Hu Shiying, Zheng Yuwei, Zhao Wanying, Huang Lishan, Yang Feng, Wu Yan
College of Furnishings and Industrial Design, Nanjing Forestry University, Nanjing 210037, China.
Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
ACS Omega. 2023 Jun 6;8(24):21726-21735. doi: 10.1021/acsomega.3c01282. eCollection 2023 Jun 20.
This study employed bamboo as the raw material and employed the sodium chlorite method to remove most of the chromogenic groups in bamboo. The low-temperature reactive dyes were then utilized as the dyeing agents in combination with the one-bath method to dye the decolorized bamboo bundles. The dyed bamboo bundles were subsequently twisted into bamboo fiber bundles with high flexibility. The effects of various factors, including dye concentration, dyeing promoter concentration, and fixing agent concentration, on the dyeing properties, mechanical properties, and other properties of the twisted bamboo bundles were investigated using a tensile test, dyeing rate test, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. The results indicate that the macroscopic bamboo fibers prepared by the top-down method have excellent dyeability. The dyeing treatment not only improves the aesthetics of bamboo fibers but also improves their mechanical properties to a certain extent. When the concentration of dye is 1.0% (o.w.f.), the concentration of dye promoter is 30 g/L, and the concentration of color fixing agent is 10 g/L, the comprehensive mechanical properties of the dyed bamboo fiber bundles are the best. At this time, the tensile strength is 95.1 MPa, 2.45 times that of undyed bamboo fiber bundles. XPS analysis results show that the relative content of C-O-C in the fiber is significantly increased compared with that before dyeing, which indicates that the formed dye fiber covalent bond can strengthen the cross-linking between fibers, thus improving its tensile performance. The covalent bond is stable, and the dyed fiber bundle can retain its mechanical strength even after high temperature soaping.
本研究以竹子为原料，采用亚氯酸钠法去除竹子中的大部分发色基团。然后将低温活性染料用作染色剂，结合一浴法对脱色后的竹束进行染色。随后将染色后的竹束捻成具有高柔韧性的竹纤维束。使用拉伸试验、染色速率试验、傅里叶变换红外光谱、X射线光电子能谱和扫描电子显微镜研究了染料浓度、染色促进剂浓度和固色剂浓度等各种因素对捻制竹束的染色性能、机械性能和其他性能的影响。结果表明，通过自上而下的方法制备的宏观竹纤维具有优异的染色性。染色处理不仅提高了竹纤维的美观性，还在一定程度上提高了它们的机械性能。当染料浓度为1.0%（owf）、染色促进剂浓度为30 g/L、固色剂浓度为10 g/L时，染色竹纤维束的综合机械性能最佳。此时，拉伸强度为95.1 MPa，是未染色竹纤维束的2.45倍。XPS分析结果表明，与染色前相比，纤维中C-O-C的相对含量显著增加，这表明形成的染料-纤维共价键可以加强纤维之间的交联，从而提高其拉伸性能。共价键稳定，染色后的纤维束即使在高温皂洗后仍能保持其机械强度。
