Zhang Jinwei, Chen Wuyong
Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University Chengdu 610065 China
College of Biomass Science and Engineering, Sichuan University Chengdu 610065 China.
RSC Adv. 2020 Jun 19;10(39):23503-23509. doi: 10.1039/d0ra04189k. eCollection 2020 Jun 16.
In leather manufacturing, microwave usually has the ability to strengthen the combination between collagen and chemicals and make the corresponding procedures faster and more effective. Although some studies clarified that tanning under microwave resulted in leather with better thermal stability, the process and leather properties of the pelt chrome tanning had not been elaborated in detail. Thus, in this study, pickled goat pelt was tanned for 5 h as a penetration procedure and then basified for another 5 h as a fixation procedure under microwave heating (MW) and water bath heating (WB); then, the changes in the pH of the chromium complexes as well as the leather chrome content were measured; finally, thermal behaviors and collagen structure of leather tanned under different methods were measured. The results indicated that microwave promoted chrome tanning agent penetration and exhaustion, consequently, chrome tanning process was faster and more effective. The leather tanned with microwave assistance had better hydrothermal and thermal stability as well as thermal decomposition resistance, indicating microwave leading to excellent tanning effect. Nevertheless, when microwave was applied in the chrome tanning process, the hierarchical structure of the leather and the collagen conformation including triple helix was not affected, and the combination pattern between ligands and chromium was also the same as that of the conventional. In brief, microwave could fasten the chrome tanning process and result in extraordinary tanning effect without damaging the leather structure; therefore, microwave might be a new method for promoting tanning efficiency and effect in future.
在皮革制造中，微波通常能够增强胶原蛋白与化学物质之间的结合，并使相应的工序更快、更有效。尽管一些研究表明，微波鞣制能使皮革具有更好的热稳定性，但生皮铬鞣制的工艺和皮革性能尚未得到详细阐述。因此，在本研究中，对浸酸山羊皮进行微波加热（MW）和水浴加热（WB）鞣制，其中渗透工序为5小时，随后的固定工序为另外5小时；然后，测量铬络合物的pH值变化以及皮革中的铬含量；最后，测定不同方法鞣制皮革的热行为和胶原结构。结果表明，微波促进了铬鞣剂的渗透和吸收，因此，铬鞣制过程更快、更有效。微波辅助鞣制的皮革具有更好的水热稳定性、热稳定性以及抗热分解性，表明微波可产生优异的鞣制效果。然而，当在铬鞣制过程中应用微波时，皮革的层级结构和包括三螺旋在内的胶原构象并未受到影响，配体与铬之间的结合模式也与传统方法相同。简而言之，微波可以加快铬鞣制过程，并在不破坏皮革结构的情况下产生非凡的鞣制效果；因此，微波可能是未来提高鞣制效率和效果的一种新方法。
