With the growth of leather industry, plenty of leather solid wastes (LSW) have been generated annually but economic and ecological solution to utilize LSW is lacking because the crosslinked structure inhibits the reprocessing at macromolecular level to attain high performance materials. Herein, we present a facile route to realize physically de-bundling and de-crosslinking of chrome tanned collagen fibers as well as the preparation of LSW/natural rubber (NR) composite featuring remarkable tensile properties via mechanochemistry effect exerted by solid-state shear milling (S³M) equipment. It is found that original coordination between chrome and carboxylic group can be cleaved and the released chrome enables the in-situ compatibilization between LSW and natural rubber via the complexation between chrome and sulfur, which enables dual excellence in toughness and tensile strength compared with non-chromium containing composite. The improved dispersion and interfacial interaction enable the incorporation of 40 wt% LSW to afford respective NR composites with exceptional stress at 100 % strain (S100) and modulus, which are 5.07 MPa and 27.33 MPa, respectively, as well as superior tear strength and thermal stability. The S³M technology not only highlights a facile and green route to turn chrome containing LSW into high performance bio-based NR material, but also spurs the devising of innovative materials comprising leather collagen fibers.

随着皮革工业的发展，每年都会产生大量的皮革固体废物 (LSW)，但由于交联结构抑制了大分子水平的再加工以获得高性能材料，因此缺乏利用 LSW 的经济和生态解决方案。在此，我们提出了一种简便的途径来实现铬鞣胶原纤维的物理解束和解交联，以及通过固态剪切研磨施加的机械化学效应制备具有显着拉伸性能的 LSW/天然橡胶 (NR) 复合材料(S ³M) 设备。发现铬与羧基之间的原始配位可以被裂解，释放的铬通过铬和硫之间的络合使LSW与天然橡胶之间原位相容，与非含铬复合物。改进的分散和界面相互作用使 40 wt% LSW 的加入能够提供各自的 NR 复合材料，其在 100% 应变 (S100) 和模量下的应力和模量分别为 5.07 MPa 和 27.33 MPa，以及优异的撕裂强度和耐热性稳定性。S ³M 技术不仅突出了将含铬 LSW 转化为高性能生物基 NR 材料的简便绿色途径，而且还推动了包括皮革胶原纤维在内的创新材料的设计。