Abstract：
The aim of this study was to develop new discarded enoki mushroom root-derived multifunctional chrome-free chitosan-based tanning agents that can be used for eco-leather manufacturing. In this study, oligochitosan (OCS) was prepared from chitosan extracted from the enoki mushrooms and chemically modified using reactive dye R19 and epichlorohydrin (ECH) to prepare chromium-free tanning agent (OCS-R19-ECH) with both tanning and dyeing functions. FT-IR, XRD, and NMR (1H) confirmed the successful synthesis of the product. The molecular weight of OCS-R19-ECH is 6355 g/mol, with an average particle size of 1249.37 nm and an epoxy value of 0.276 mol/100 g. OCS-R19-ECH was used for tanning experiments on bated sheepskin, and the results showed that the leather tanned with OCS-R19-ECH not only exhibited excellent wet-heat stability (shrinkage temperature = 81 °C), but also superior dyeing uniformity, resistance to dry and wet abrasion, mechanical strength (tensile strength = 12.4 MPa, tear strength = 57.3 N/mm), and outstanding antimicrobial properties. Most importantly, compared with traditional tanning agents, OCS-R19-ECH has a higher pH (9.0), tanning-dyeing integration, non-acid soaking, and non-basifying can be achieved in leather making, which can greatly simplify the tanning processes. This new multifunctional chrome-free chitosan-based tanning agent facilitates high-value utilization of waste resources.
摘要：
这项研究的目的是开发新的废弃的enoki蘑菇根衍生的多功能无铬壳聚糖鞣剂，可用于生态皮革制造。在这项研究中,从金针菇中提取的壳聚糖制备了低聚壳聚糖（OCS），并使用活性染料R19和表氯醇（ECH）进行化学改性，以制备具有鞣制和染色功能的无铬鞣剂（OCS-R19-ECH）。FT-IR,XRD,和NMR(1H)证实了产物的成功合成。OCS-R19-ECH的分子量为6355g/mol，平均粒径为1249.37nm，环氧值为0.276mol/100g。OCS-R19-ECH用于在贝特羊皮上进行鞣制实验，结果表明，用OCS-R19-ECH鞣制的皮革不仅表现出优异的湿热稳定性(收缩温度=81℃)，而且染色均匀性优越，耐干和湿磨损，机械强度(抗拉强度=12.4MPa,撕裂强度=57.3N/mm),和突出的抗菌性能。最重要的是,与传统鞣剂相比，OCS-R19-ECH具有较高的pH（9.0），鞣染一体化,非酸浸泡，在皮革制造中可以实现非碱化，这可以大大简化鞣制过程。这种新型多功能无铬壳聚糖基鞣剂促进了废弃资源的高价值利用。
