The Central Leather Research Institute of CSIR (Council of scientific and Industrial Research) has developed a technology to create a re-tanning agent from lignin. Effluent from the paper and pulp industry, predominantly contains large amounts of polyphenols like lignin and fragmented lignin. The leather industry consumed a large amount of synthetic phenol-formaldehyde resin as a re-tanning agent to improve the homogeneity and organoleptic properties of leather and the presence of free formaldehyde in leather is a major concern because of its carcinogenicity.
The development phenolic re-tanning agent devoid of formaldehyde is critical for effective waste management and environmental welfare. Waste liquor collected from the leather and tanning industry has been chemically modified and used as a re-tanning agent in leather manufacturing.
Some of the highlight features of this technology include; utilization of the paper and pulp industry as a re-tanning agent, product is free from formaldehyde, imparts excellent soft touch and wet feel to the leather, smooth and fine grain and compatible with all kind of syntans, vegetable tannins & fat liquors.
This technology is ready for commercialization.
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