Ecofriendly and sustainable metal-free leather tanning using novel poly(carbamoyl sulfonate) technology
Abstract Despite its potential as a metal-free tanning agent capable of eliminating Cr pollution in the leather industry, the conventional preparation of poly(carbamoyl sulfonate) faces challenges, such as the extensive use of low-boiling organic solvents and low blocking ratios of –NCO groups. Here...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-04-01
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| Series: | Collagen and Leather |
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| Online Access: | https://doi.org/10.1186/s42825-025-00190-0 |
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| author | Pengfei Qiao Jie Liu Liqiang Jin Feifei Zhang Zhonghe Feng Yulu Wang |
| author_facet | Pengfei Qiao Jie Liu Liqiang Jin Feifei Zhang Zhonghe Feng Yulu Wang |
| author_sort | Pengfei Qiao |
| collection | DOAJ |
| description | Abstract Despite its potential as a metal-free tanning agent capable of eliminating Cr pollution in the leather industry, the conventional preparation of poly(carbamoyl sulfonate) faces challenges, such as the extensive use of low-boiling organic solvents and low blocking ratios of –NCO groups. Herein, a liquid sulfonate chain extender, 2,3-dihydroxypropanesulfonic acid triethylamine salt (DHPSTEA), was initially synthesized. A series of poly(carbamoyl sulfonate) tanning agents (CTAS) were then synthesized using DHPSTEA and various diisocyanates as reaction monomers, with sodium bisulfite serving as the blocking agent and without utilizing organic solvents. CTAS demonstrated a blocking ratio of > 99% and satisfactory stability under acidic conditions at room temperature. Application experiments revealed that CTAS exhibited excellent tanning performance, with the parent diisocyanate monomer markedly influencing their tanning properties. CTAS synthesized with dicyclohexylmethane-4,4′-diisocyanate resulted in optimal product performance, yielding a shrinkage temperature of 83.2 °C at a 6% dosage. CTAS-tanned leather displayed excellent collagen fiber dispersion, yellowing resistance and mechanical properties. Additionally, CTAS is easy to biodegrade (BOD5/COD > 0.45). Thus, this novel metal-free tanning agent holds a great potential as a sustainable alternative to traditional chrome tanning agent. Graphical Abstract |
| format | Article |
| id | doaj-art-edbaca4bbd9e435e86ea3012a1134e07 |
| institution | OA Journals |
| issn | 2097-1419 2731-6998 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Collagen and Leather |
| spelling | doaj-art-edbaca4bbd9e435e86ea3012a1134e072025-08-20T02:25:41ZengSpringerOpenCollagen and Leather2097-14192731-69982025-04-017111510.1186/s42825-025-00190-0Ecofriendly and sustainable metal-free leather tanning using novel poly(carbamoyl sulfonate) technologyPengfei Qiao0Jie Liu1Liqiang Jin2Feifei Zhang3Zhonghe Feng4Yulu Wang5Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences)Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences)Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences)Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences)Dezhou Xinglong Leather Products Co., Ltd.Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences)Abstract Despite its potential as a metal-free tanning agent capable of eliminating Cr pollution in the leather industry, the conventional preparation of poly(carbamoyl sulfonate) faces challenges, such as the extensive use of low-boiling organic solvents and low blocking ratios of –NCO groups. Herein, a liquid sulfonate chain extender, 2,3-dihydroxypropanesulfonic acid triethylamine salt (DHPSTEA), was initially synthesized. A series of poly(carbamoyl sulfonate) tanning agents (CTAS) were then synthesized using DHPSTEA and various diisocyanates as reaction monomers, with sodium bisulfite serving as the blocking agent and without utilizing organic solvents. CTAS demonstrated a blocking ratio of > 99% and satisfactory stability under acidic conditions at room temperature. Application experiments revealed that CTAS exhibited excellent tanning performance, with the parent diisocyanate monomer markedly influencing their tanning properties. CTAS synthesized with dicyclohexylmethane-4,4′-diisocyanate resulted in optimal product performance, yielding a shrinkage temperature of 83.2 °C at a 6% dosage. CTAS-tanned leather displayed excellent collagen fiber dispersion, yellowing resistance and mechanical properties. Additionally, CTAS is easy to biodegrade (BOD5/COD > 0.45). Thus, this novel metal-free tanning agent holds a great potential as a sustainable alternative to traditional chrome tanning agent. Graphical Abstracthttps://doi.org/10.1186/s42825-025-00190-0Metal-free tanning agentPoly(carbamoyl sulfonate)Sulfonate chain extenderSustainable developmentLeather tanning process |
| spellingShingle | Pengfei Qiao Jie Liu Liqiang Jin Feifei Zhang Zhonghe Feng Yulu Wang Ecofriendly and sustainable metal-free leather tanning using novel poly(carbamoyl sulfonate) technology Collagen and Leather Metal-free tanning agent Poly(carbamoyl sulfonate) Sulfonate chain extender Sustainable development Leather tanning process |
| title | Ecofriendly and sustainable metal-free leather tanning using novel poly(carbamoyl sulfonate) technology |
| title_full | Ecofriendly and sustainable metal-free leather tanning using novel poly(carbamoyl sulfonate) technology |
| title_fullStr | Ecofriendly and sustainable metal-free leather tanning using novel poly(carbamoyl sulfonate) technology |
| title_full_unstemmed | Ecofriendly and sustainable metal-free leather tanning using novel poly(carbamoyl sulfonate) technology |
| title_short | Ecofriendly and sustainable metal-free leather tanning using novel poly(carbamoyl sulfonate) technology |
| title_sort | ecofriendly and sustainable metal free leather tanning using novel poly carbamoyl sulfonate technology |
| topic | Metal-free tanning agent Poly(carbamoyl sulfonate) Sulfonate chain extender Sustainable development Leather tanning process |
| url | https://doi.org/10.1186/s42825-025-00190-0 |
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