基于鞣制废革屑的生物基皮革填料的制备及性能

采用双氧水对非铬金属鞣制废革屑进行了催化氧化,制得降解产物(DCH),然后采用双醛海藻酸钠(DSA)对DCH进行改性,获得生物基皮革填料(BDH)。采用FTIR、GPC、XPS和Zeta电位分析仪对DCH和BDH的结构和性质进行了表征。结果表明,DSA对DCH成功进行了改性,BDH的重均相对分子质量可由DCH的3900提升至5570,同时其等电点由5.2调控至3.3。填充实验表明,相较于未添加蛋白填料的革坯,DCH和BDH填充革坯的各项性能明显更优,特别是抗张强度和丰满性;与DCH填充革坯相比,BDH填充革坯的抗张强度由11.5 N/mm~2提升至22.9 N/mm~2,撕裂强度由58.1 N/mm提升至80.9 N/mm,柔软度由7.2 mm提升至7.9 mm,丰满性也得到提升,整体性能优于常用商品蛋白填料。

Preparation and properties of bio-based leather filler based on waste tanned leather shavings

Non-chrome metal tanned waste leather shavings were used as raw materials to be degraded by hydrogen peroxide catalytic oxidation for preparing bio-based protein filler. The degraded collagen hydrolysate (DCH) was then modified with dialdehyde sodium alginate (DSA) to prepare bio-based DCH (BDH). The structure and properties of DCH and BDH were characterized by FTIR, GPC, XPS and Zeta potential test. The results showed that DSA successfully modified DCH, and the weight-average molecular weight of BDH was increased from 3900 g/mol of DCH to 5570 g/mol as well as its isoelectric point was changed from 5.2 to 3.3. Compared with the crust leather without filling by protein filler, the properties of DCH and BDH filled crust leathers were significantly better, especially the tensile strength and fullness. Compared with the DCH filled crust leather, the tensile strength of BDH filled crust leather increased from 11.5 N/mm2 to 22.9 N/mm2, its tear strength increased from 58.1 N/mm to 80.9 N/mm and the softness increased from 7.2 mm to 7.9 mm. Besides, the fullness of BDH filled crust leather was further improved. Overall, the above-mentioned properties were better than those of crust leather filled using common commercial protein filler.