Dialdehyde sodium alginate (DSA) is an alternative chrome-free tanning material for fur production. To obtain satisfactory resultant fur and provide suggestions for the usage of DSA in fur making, the general properties of DSA tanned sheep fur were systematically investigated. The tanning mechanism of DSA was analyzed and it was verified that DSA was mainly combined with collagen fiber by forming Schiff base covalent bonds while supplemented by a small number of hydrogen bonds and ionic bonds. Due to the acid sensitivity of Schiff base structure, DSA tanned fur had poor resistance to acid rinsing but had excellent resistance to washing and good fatliquoring performance. Also, it had good resistances to yellowing and reductant. After being retanned by chrome tanning agent, the fur was capable of enduring a high-temperature dyeing process (68 °C for 8 h). Overall, DSA tanned sheep fur had favorable properties under appropriate post-tanning processing conditions to manufacture light-colored or dark-colored fur products with desirable physical properties.

中文翻译：

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生物质醛鞣制羊皮选择性鞣制一般性能的研究

海藻酸二醛钠（DSA）是用于毛皮生产的另一种无铬鞣革材料。为了获得令人满意的合成皮草，并为DSA在皮草制造中的使用提供建议，系统地研究了DSA鞣制绵羊皮的一般特性。分析了DSA的鞣制机理，证实了DSA主要通过形成席夫碱共价键与胶原纤维结合，同时辅以少量的氢键和离子键。由于席夫碱结构对酸的敏感性，DSA鞣制的毛皮耐酸洗性差，但耐洗涤性和加脂性能良好。而且，它具有良好的耐黄变和还原性。经过铬鞣剂复鞣后，毛皮能够承受高温染色过程（68°C持续8 h）。总体而言，DSA鞣制的绵羊皮在适当的鞣制后加工条件下具有良好的性能，可生产具有所需物理性能的浅色或深色皮草产品。