Liu Jie, Zhang Feifei, An Zhendi, Shi Wanpeng, Li Hong
School of Light Industry Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences) Jinan 250353 China
Key Laboratory for Green Technology of Leather Manufacture, China National Light Industry Council Jinan 250353 China.
RSC Adv. 2021 Aug 9;11(44):27183-27192. doi: 10.1039/d1ra04057j.
An amino-terminated hyperbranched polymer (A-HP) was employed to modify leather buffing dust (BD) to prepare functional filler, hyperbranched buffing dust (HBD). The structure and morphology of BD and HBD were characterized by XPS, DSC and SEM. Furthermore, HBD was added into the typical solvent type polyurethane (PU) to prepare a wetting PU film which was used as the coating for synthetic leather. By changing the dosage of HBD, the filler species, the properties of the porous structure and mechanical strength of the PU film were analyzed by SEM, DMA and so on. The experimental results indicated that with the increase of the dosage of HBD, the porous structure of the PU film increase. The content of the N element for BD increases from 4.27% to 7.29%. After modification and ball milling, the fineness of most fibers was in the range of 6.7-6.9 μm. The fiber dispersion state of HBD was more uniform. The of the PU film with HBD is -8.67 °C, while for lignin is -8.41 °C, indicating that the wetting PU film filled with HBD has better flexibility at low temperature.
采用氨基封端的超支化聚合物（A-HP）对皮革磨屑（BD）进行改性，制备功能填料超支化磨屑（HBD）。通过XPS、DSC和SEM对BD和HBD的结构与形貌进行了表征。此外，将HBD添加到典型的溶剂型聚氨酯（PU）中，制备了一种润湿性PU膜，用作合成革涂层。通过改变HBD的用量，利用SEM、DMA等手段分析了PU膜的填料种类、多孔结构性能和机械强度。实验结果表明，随着HBD用量的增加，PU膜的多孔结构增加。BD中N元素的含量从4.27%增加到7.29%。经过改性和球磨后，大多数纤维的细度在6.7-6.9μm范围内。HBD的纤维分散状态更均匀。含HBD的PU膜的玻璃化转变温度为-8.67℃，而含木质素的PU膜为-8.41℃，表明填充HBD的润湿性PU膜在低温下具有更好的柔韧性。
