An amino-terminated waterborne polyurethane-based polymeric dye (AWPUD) was synthesized for the high-performance dyeing of chrome-free leather tanned by biomass-derived aldehyde (BAT). Fourier transform infrared spectroscopy (FTIR) and ¹H NMR spectra illustrated the successful synthesis of AWPUD via incorporating small-molecule dyes (SMDs) (C.I. Acid Red 14) and sodium 2,4-diaminobenzenesulfonate into the polyurethane skeleton. The amino group content of AWPUD was tested to be 1.34 wt% (based on dry weight), which included 0.65 wt% of terminal amino groups. The characteristic absorption peaks of AWPUD were observed at 538 nm and 573 nm, similar to those of SMDs. AWPUD-dyed crust leathers exhibited better dyeing performances than SMD-dyed crust leather in terms of comparable dye penetration degree, lower chroma of wastewater, and higher filler-dye uptake ratio. In addition, AWPUD-dyed crust leathers had higher dyeing uniformity, dry-wet rubbing resistance, and thermal stability. Meanwhile, AWPUD-dyed crust leathers had better comprehensive physical properties in terms of higher mechanical strengths, comparable softness, and smooth grain surface. These results suggest that AWPUD has the great potential to be used in the high-performance dyeing of BAT-tanned leather.

合成了一种端氨基水性聚氨酯聚合物染料 (AWPUD)，用于生物质衍生醛 (BAT) 鞣制的无铬皮革的高性能染色。傅里叶变换红外光谱 (FTIR) 和¹H NMR 谱表明通过将小分子染料 (SMD)（CI 酸性红 14）和 2,4-二氨基苯磺酸钠掺入聚氨酯骨架中成功合成了 AWPUD。AWPUD的氨基含量经测试为1.34wt%（基于干重），其中包括0.65wt%的末端氨基。在 538 nm 和 573 nm 处观察到 AWPUD 的特征吸收峰，与 SMD 的特征吸收峰相似。AWPUD染色的结皮在染料渗透度相当、废水色度较低、填料-染料吸收率较高等方面表现出比SMD染色结皮更好的染色性能。此外，AWPUD 染色的结皮革具有更高的染色均匀性、耐干湿摩擦性和热稳定性。同时，AWPUD染色的结皮革具有更好的综合物理性能，机械强度更高，柔软度相当，粒面光滑。这些结果表明 AWPUD 具有用于 BAT 鞣制皮革的高性能染色的巨大潜力。