1. Role as a Tanning Agent
As a tanning agent, calcium lignosulfonate reacts chemically with the collagen proteins in leather, forming stable cross-linking structures that render the leather soft, durable, and resistant to decay. This chemical reaction effectively binds the tannins with the proteins in the leather, providing excellent physical and chemical properties to the leather.
2. Antimicrobial and Antifungal Properties
During the leather processing, the presence of moisture and microorganisms can lead to mold and decay. Calcium lignosulfonate has the ability to inhibit the growth of bacteria and fungi, thereby extending the shelf life of leather, improving its quality, and adding value to it.
3. Enhancement of Leather Flexibility and Elasticity
By binding with the proteins in the leather, calcium lignosulfonate fills the gaps between leather fibers, enhancing the leather’s flexibility and elasticity, resulting in better feel and comfort when worn. This effect is crucial for enhancing the comfort and aesthetics of leather products.
4. Environmental Friendliness
Compared to traditional tanning agents, calcium lignosulfonate has minimal environmental impact. Its wastewater and residues have less pollution impact on the environment, aligning with the modern society’s demand for environmentally friendly products and the development trend of green tanning.
In summary, calcium lignosulfonate plays a multifaceted and significant role in leather tanning. Its abilities as a tanning agent, antimicrobial properties, improvement of leather performance, and environmental friendliness make it an indispensable material in the leather industry.