绿色皮革鞣制工艺:D-赖氨酸醛作为新型鞣剂应用于无铬鞣制中(续)

Greener Approach to Leather Tanning Process:D-lysine aldehyde as novel tanning agent for chrome-free tanning

开发了一种基于D-赖氨酸醛复合物的绿色环境友好皮革鞣制工艺。通过环境影响评估,考察了D-赖氨酸醛鞣革的物理化学性能、形态特征、耐胶原溶解性和感官性能。采用收缩温度仪、差示扫描量热分析、热力学分析,考察鞣革的收缩温度、变性温度和机械强度。结果表明:鞣革的上述性能均好于醛单独鞣革,与铬鞣革相当。鞣革截面纤维结构的密度表明:与醛鞣革相比,其结构和纤维束的分散度较差,但鞣革显示出比传统鞣制鞣革具有更好的耐胶原溶解性。D-赖氨酸醛鞣革的丰满性、柔软性,粒面光滑度、外观和颜色均优于醛单独鞣革。环境影响评估表明:与传统鞣制工艺相比,该工艺鞣后废液中的总固体含量,如溶解固体含量和悬浮物含量均显著减少。同时,由于D-赖氨酸GTA鞣制工艺,减少了化学品的消耗量,节约了污水治理成本,从而具有成本优势。与铬鞣工艺相比,该工艺减少了有毒废弃物的排放、环境影响小,是一种有利于环保发展的绿色清洁制革技术。

A greener and eco - friendly method to leather tanning process was developed based on D - lysine aldehyde com- plex. The physico- chemical and morphological characteristics, resistance to collagenolytic activity and organoleptic properties of the D - lysine glutaraldehyde tanned leather were evaluated in terms of environmental impact assessment. The shrinkage tempera- ture, denaturation temperature and mechanical strength of tanned leather were analysed by using shrinkage, differential scanning calorimetric and thermomechanical analysis techniques. The results show that the above properties of the tanned leather are better than that of glutaraldehyde alone or equal to chrome tanned leather. The density of the fibre structure throughout the cross section indicates the even structure and fibre bundles seem to be less dispersed compared to glutaraldehyde alone. This tanning tanned leather demonstrates a higher resistance to collagenolytic activity than conventional tanned leather. The tanned leather exhibits good fullness, softness, smoothness, colour and general appearance compared to glutaraldehyde alone. The significant reduction in total solids content such as dissolved solids and suspended solids present in the effluent compared to conventional tanning method is evident from environmental impact assessment studies. This tanning process has the cost advantages due to the possible decrease in chemicals consumptions and net saving from the reduced effluent treatment costs. The improved tanning process reduces genera- tion of toxic waste compared to chrome tanning process and can be regarded as eco - friendly, which reducing the environmental impacts and contributes to the development of greener or cleaner process.