有机鞣法生产高湿热稳定性轻革

Studies on High Hydrothermal Stability Organic Tannages

本文研究植物鞣剂──合成鞣剂结合鞣法。合成鞣剂选用能与植物剂发生交联反应的改性 唑烷（ＯｘａｚｏｌｉｄｉｎｅＥ）。研究了促进交联反应发生从而获得高湿热稳定性革的最佳条件（ｐＨ值、温度、时间、鞣法）。结果表明，在常用植物鞣剂中，凝缩类植物鞣剂比水解类植物鞣剂更适宜于这类鞣法，而其中荆树皮栲胶表现出突出的优越性。最好的鞣法是植物鞣＋改性 唑烷复鞣。最佳复鞣条件是温度６Ｏ℃、ｐＨ５～６、转动２～３小时。荆树皮栲胶用量为酸皮重２０％或１５％，相应复鞣剂的用量为４％或６％，革的湿热稳定性可达到耐沸水５分钟点（Ｔｓ≥１１０℃），符合鞋面革的热稳定性要求。酸皮重７．５％甚至５％的荆树皮栲胶与２％以上改性 唑烷配合使用，革的湿热稳定性可达到中国的服装革部颁标准（Ｔｓ９０℃）以上。实验数据还表明，凝缩类植物鞣剂与交联剂改性 唑烷之间确有交联反应发生。

In this paper,combination tannage of vegetable tannin and syntan had been studied.The syntan used was modified oxazolidine(oxazolidine E)which could react with vegetable tannins.Optimum tannage conditions for producing high hydrothermal stability leather were systematically investigated.Obtained data showed that condensed tannins always work better than hydrolysable tannins.Among condensed tannins , mimosa works much more efficient than others.Optimum tannage was vegetable tanning followed by oxazolidine retanning.Optimum retanning conditions were running for 2-3 hrs at 60°C ,with final PH value 5-6. Offer of mimosa for producing'boilproof-leather'(Ts≥110°C) was 15%(based on pickled pelt),where 6%oxazolidine is required.The leather suitable for garment (Ts>95°C )could be obtained by mimosa tanning followed by oxazolidine retanning.Furthermore,crosslinkage between condensed tannin and oxazolidine could be confirmed from experimental results.