Abstract
Based on a novel triazine compound, the properties of tanned leather and commercial feasibility in pilot scale have been investigated. Then this novel approach tanning was compared with conventional chrome tanning: in the condition of less-salt pickling and chrome free, the physicochemical properties including thermal stability and mechanical strength were analyzed. Meanwhile, the surface roughness and fiber dispersion were evaluated as well. The results show that the thermal stability and mechanical strength of the triazine compound tanned leather are similar to conventional chrome tanned leather, the fiber bundle is well-dispersed and much evener than that of chrome treating. The optimized tanning approach has obvious reduction in environmental impact and leads an excellent biodegradability of tanning liquor. In industrial application, the cost of materials and water treatment are reduced effectively. The production of chrome free leather can encourage the sustainable development of leather industry and protects ecological environment in some extent.
Highlights
Environmental protection totally is a global revolution [1]
The novel approach to tanning process based on the triazine compound synthesized by cyanuric chloride, sulfanilic acid and p-hydroxybenzaldehyde in aqueous systems, and the structure of the product was confirmed by FTIR and 1HNMR
The physicochemical properties of the tanned leather were explored by analyzing shrinkage temperature, denaturation temperature, mechanical strength and sensory properties, which are similar to conventional chrome tanned leather
Summary
Environmental protection totally is a global revolution [1]. And cleaner chemistry or manufacture technology in the industrial sustainable development is the improved of novel chemical products and different processes that can diminish or eliminate the addition and generation of hazardous materials [2,3,4,5]. Conventional chrome tanning is known to contribute more than 98% of the pollution loads from leather processing and results in serious environmental impact, the sulfates, chlorides and chromium [8,9]. In 2014, a narrower regulation of the Cr (VI) concentration for leather products was revised by the European Commission in Annex XVII of regulations of REACH (Registration, Evaluation, Authorization and Restriction of Chemicals). It provides that the leather products would be forbidden if they contained Cr (VI) in concentrations equal to or higher than 3 mg/kg, because there would be a direct damage to the leather production and circulation
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