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4460144 
Journal Article 
Desirable retanning system for aldehyde-tanned leather to reduce the formaldehyde content and improve the physical-mechanical properties 
Sun, X; Jin, Y; Lai, S; Pan, J; Du, W; Shi, L 
2018 
Journal of Cleaner Production
ISSN: 0959-6526
EISSN: 1879-1786 
175 
199-206 
The aim of the present work is to provide a new retanning system for aldehyde-tanned leather, which can improve the physical-mechanical property of resultant leather and reduce the formaldehyde content in the resultant leather. This new retanning system consists of polyacrylic acid and gemini polyurethane surfactant, which are not harmful to human. The physical-mechanical property of leathers treated with different retanning system was analyzed, and the fiber structure of leather treated with the new complex retanning system was observed; the effects of some factors on the physical-mechanical property and formaldehyde content of leathers were studied, which were the hydrophobic chain length of gemini polyurethane surfactant, the offer percentage of retanning agent and the pH condition of retanning process. The results showed that the complex retanning system had better retanning effect, and the physical-mechanical property and formaldehyde content of leathers would be affected by above factors. When the hydrophobic chain length was eight and the offer percentage was 6%, the retanning effect was the best, and the thickening rate was 8.5%, the elongation and tear strength increased by 14.5% and 18.4%, respectively. At the same time, the reduction rate of formaldehyde content was 30.0%. Notably, when the value of pH decreased to 2.7 in the retanning stage, the reduction rate of formaldehyde content could increase to 39.3%. This retanning system had better retanning effect, which indicated that it would be helpful to the clean production of leather and the development of environmental protection. In addition, the work provided a good alternative to solve the other formaldehyde problems in our life. (C) 2017 Elsevier Ltd. All rights reserved. 
Polyacrylic acid; Gemini polyurethane surfactant; Complex retanning system; Aldehyde-tanned leather; Physical-mechanical property; Formaldehyde content 
IRIS
• Formaldehyde [archived]
     HAWC
          Reproduction and development
               Excluded
     Search Update 2016-2017
          Reproductive and Developmental effects
               WoS
     Search Update 2018-2021
     2017-2018 LitSearch
          Reproductive and Developmental Effects
               Search Update
               WOS
• IRIS Formaldehyde (Inhalation) [Final 2024]
     Literature Indexing
          WoS
          2021 Systematic Evidence Map
     Literature Identification
          Reproductive and Developmental Effects
               Excluded