铬粉/铝单宁复鞣对TWT初鞣的皮胶原纤维热降解性能的影响

Effect of chrome/aluminum tanning agent retanning on the thermal degradation properties of TWT tanned collagen fibers

制备出了新型无铬鞣剂TWT初鞣的黄牛皮胶原纤维样品,并用铬鞣剂与铝鞣剂分别复鞣处理TWT初鞣的黄牛皮胶原纤维样品,对上述三类经过鞣制和复鞣处理的黄牛皮胶原纤维和未鞣制处理的黄牛皮胶原纤维进行热失重分析,利用atava-estk法和Flynn-wallOzawa法处理四个样品在不同加热速率下的热重分析数据.研究结果显示:在相同加热速率下,TWT初鞣的黄牛皮胶原纤维在达到最大降解速率时的热降解温度均高于未鞣制黄牛皮胶原纤维,且TWT初鞣的黄牛皮胶原纤维的热降解活化能较未鞣制处理的黄牛皮胶原纤维提高了25.595~33.309kJ/mol,两种胶原纤维热降解机理函数符合G(α)=[-ln(1-α)]4规律;同时,在相同加热速率下,复鞣处理的TWT初鞣黄牛皮胶原纤维在达到最大降解速率时的热降解温度明显高于TWT鞣制的黄牛皮胶原纤维,其中铬复鞣的TWT初鞣黄牛皮胶原纤维在最大降解速率时的热降解温度也高于铝复鞣的黄牛皮胶原纤维,且复鞣处理过的TWT初鞣黄牛皮胶原纤维的热降解活化能均低于TWT鞣制的黄牛皮胶原纤维,但铬粉/铝单宁复鞣的胶原纤维热降解机理函数也同样符合G(α)=[-ln(1-α)]4规律.

In this paper,a new type of chrome free tanning agent TWT was used to prepare a sample of cowhide collagen fibers,and the collagen fiber samples were retanned with chrome tanning agent and aluminum tanning agent. Respectively,the thermal weight loss analysis of the three types of tanned collagen fibers above and the untanned collagen fibers was performed and the thermogravimetric analysis data for four samples at different heating rates were processed using the Satava- Sestak and the Flynn wall Ozawa method. The results show that,at the same heating rate,the thermal degradation temperature of the TWT tanned colla gen fibers at the maximum degradation rate is higher than that of the untanned cowhide col lagen fibers,and its activation energy has been increased by 25. 595-33. 309 kJ/mol,the thermal degradation mechanism of two collagen fibers conforms to G（a） = [ ln（1- a）]4. Similarly, the thermal degradation temperature of the retanned cowhide collagen fibers at the maximum degradation rate was significantly higher than that of the TWT tanned cowhide collagen fibers,the thermal degradation temperature of chrome retanned cowhide collagen fi bers at the maximum degradation rate is higher than that of aluminum retanned cowhide col lagen fibers, and the activation energy of the retanned cowhide collagen fibers is lower than the TWT tanned cowhide collagen fibers, but the thermal degradation mechanism of the chrome / aluminum retanned collagen fibers is also consistent with G（a） =[ ln（1 -a）]4.