A NOVEL APPROACH FOR LIGHTFAST WET-WHITE LEATHER MANUFACTURE BASED ON SULFONE SYNTAN-ALUMINIUM TANNING AGENT COMBINATION TANNAGE

DOI 10.31554/978-5-7925-0601-5-2020-97-102

A NOVEL APPROACH FOR LIGHTFAST WET-WHITE LEATHER MANUFACTURE BASED ON SULFONE SYNTAN-ALUMINIUM TANNING AGENT COMBINATION TANNAGE

Long Zhang — Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, College of Biomass Science and Engineering, Sichuan University, Chengdu, China, 61006
Xinyu Zhao — Department of Biomass and Leather Engineering, College of Biomass Science and Engineering, Sichuan University, Chengdu, China, 610065
Chunhua Wang — Department of Biomass and Leather Engineering, College of Biomass Science and Engineering, Sichuan University, Chengdu, China, 610065, e-mail: wangchunhua@scu.edu.cn; wlin@scu.edu.cn
Wei Lin — Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, College of Biomass Science and Engineering, Sichuan University, Chengdu, China, 61006, e-
mail:wlin@scu.edu.cn

Herein, we have investigated a novel combination tannage for lightfast wet-white leather based on sulfone syntan and aluminium tanning agent. By optimizing the technology, 10% sulfone syntan (BC) and 3% aluminium tanning agent (BN) at final pH 4,0 – 4,5 can raise the shrinkage temperature (Ts) of the wet-white leather to ~81°C. Scanning electron microscope-Energy dispersive X-ray spectroscopy (SEM-EDX) results reveal that sulfone syntan and aluminium tanning agent can be evenly bound within the leather matrix, and promote the formation of tightly woven networks of collagen fibres. The novel combination tanning approach not only improves light fastness and lighter shade, but also confers high physical and mechanical properties to the wet-white leather.