A green and sustainable strategy for leather manufacturing: Endow dehydrated hide with consistent and durable hydrophobicity

A green and sustainable approach for leather-making was explored by imparting dehydrated hide (DL) with durable hydrophobicity through reacting with silane coupling agent (TMS). The rational control of hydrolysis and condensation rates of TMS was the key point for achieving efficient penetration and full reaction of TMS in DL, so as to obtain hydrophobic leather (HL-TMS). It was found that the leather-like HL-TMS could be fabricated when the DL with 5% water content reacted with TMS for 12 h under 30 degrees C at pH 6.0. In these conditions, TMS was evenly distributed in HL-TMS and provided HL-TMS with excellent water resistance, owning a dynamic waterproof time up to 163 h. Moreover, HL-TMS displayed exceptional hydrophobic durability against pH, UV, friction and organic solvents. Compared with DL, the collagen fibers of HL-TMS were well dispersed, and the porosity of which was 59.6% higher than chrome-tanned leather. In addition, the shrinkage area of HL-TMS in heating was 5.03%, remarkably less than chrome-tanned leather (12.11%), while its physical strengths and softness (9.6 mm) were higher than those of chrome-tanned leather. The results suggested that hydrophobic modification could substitute conventional tanning for manufacturing leather, and this hydrophobic modification-based strategy might push leather-making into a cleaner process.

Automated summary

A green and sustainable approach for leather-making was explored by treating dehydrated hide (DL) with silane coupling agent (TMS) to achieve hydrophobicity. By controlling the hydrolysis and condensation rates of TMS, the DL can be efficiently penetrated and reacted with TMS to obtain hydrophobic leather (HL-TMS). The HL-TMS exhibited excellent water resistance, durability against pH, UV, friction, and organic solvents, as well as improved physical strength and softness compared to chrome-tanned leather.