traNSPoSItIoN of Chrome taNNINg IN leather makINg
traNSPoSItIoN of Chrome taNNINg IN leather makINg
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DOI：
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发表时间：
2014
影响因子：
0.9
通讯作者：
Wu Chao;Wenhua Zhang;Liao Xuepin;Zeng Yunhang;Shi Bi
中科院分区：
文献类型：
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作者：
Wu Chao;Wenhua Zhang;Liao Xuepin;Zeng Yunhang;Shi Bi
为避免Chrome从皮革中释放到鞣后废液中，产生Chrome屑，研究了一种基于湿白色的反Chrome鞣工艺。采用两性有机鞣剂汀江白色鞣剂（TWT）对常规软化皮进行鞣制，不经酸洗。然后，TWT鞣制的湿白色直接用常规的后鞣制工艺处理。将Chrome鞣制转移到后鞣制结束。湿白色具有约85 ° C的收缩温度（Ts），其满足剃刮操作的需要，并且不产生Chrome剃屑。采用这种反Chrome鞣制工艺，所得革的Ts和Cr2 O3含量均高于常规Chrome鞣制革。采用这种逆向技术，Chrome产量减少了48%，主要是因为在后鞣制过程中没有Chrome从皮革中释放出来。同时，含铬废水排放量的逆过程是从传统工艺的31%，这使得它更容易从废水中收集和回收铬。此外，通过反相技术生产的皮革的拉伸强度、撕裂强度和一般外观与常规Chrome鞣制的皮革相当。
To avoid the release of chrome from leather into post tanning effluents and the generation of chrome shavings, an inverse chrome tanning technology based on wet white was investigated. Conventional bated pelt was firstly tanned using an amphoteric organic tanning agent (Tingjiang white tanning agent, TWT) without pickling. Then, the TWT tanned wet white was directly processed with conventional post tanning processes. Chrome tanning was transposed to the end of the post tanning. The wet white had a shrinkage temperature (Ts) around 85 o C that met the needs of shaving operation, and did not generate chrome shavings. The Ts and Cr 2 O 3 content of the leather, by using this inverse chrome tanning technology, were higher than those of the conventional chrome tanned leather. With this inverse technology, the chrome output was reduced by 48%, mainly because no chrome was released from leather in post tanning processes. Meanwhile, the volume of chromium-containing wastewater discharged from the inverse processes was barely 31% of that from the conventional processes, which makes it much easier to collect and recover chromium from the effluents. Additionally, the tensile strength, tear strength and general appearances of the leather produced by the inverse technology were comparable to those of the conventional chrome tanned leather.