马桑皮植物鞣剂与铝盐结合鞣制性能及机理  

Tanning performance and mechanism of Coriaria nepalensis bark vegetable tanning agent combined with aluminum salt

作　　者：郭林新 强涛涛 马养民 任龙芳 GUO Linxin;QIANG Taotao;MA Yangmin;REN Longfang(College of Bioresources Chemical and Materials Engineering,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China;College of Chemistry and Chemical Engineering,Ankang University,Ankang 725000,Shaanxi,China;Key Laboratory of Chemical Additives for China National Light Industry,Xi'an 710021,Shaanxi,China)

机构地区：[1]陕西科技大学轻工科学与工程学院,陕西西安710021 [2]安康学院化学化工学院,陕西安康725000 [3]中国轻工业轻化工助剂重点实验室,陕西西安710021

出　　处：《精细化工》2021年第9期1896-1903,共8页Fine Chemicals

基　　金：陕西省教育厅重点科学研究计划(协同创新中心项目)(20JY003);陕西省重点科技创新团队(2020TD-009)。

摘　　要：以提取于马桑皮的植物鞣剂为原料,与铝盐进行绵羊酸皮结合鞣制,优化鞣制工艺并建立基于马桑皮植物鞣剂植铝结合鞣制方法,对鞣制后皮革性能及鞣制机理进行研究。结果表明,当马桑皮植物鞣剂用量为酸皮质量的15%、Al_(3)(SO_(4))_(2)·18H_(2)O用量为酸皮质量的20%、渗透pH为4.0、结合pH为4.5的条件下,皮革收缩温度可达110.5℃。皮革表观性能良好,增厚率为82.2%±2.7%、抗张强度为(10.0±1.1) MPa、撕裂强度为(52.5±1.9)N/mm、断裂伸长率为76.8%±3.3%,优于橡椀鞣剂结合鞣制的皮革。鞣制后皮革胶原纤维变粗,形成紧密的网状结构,马桑皮植物鞣剂能充分渗透至皮革胶原纤维中,并与其产生氢键交联。在结合鞣制时,铝盐与皮革胶原纤维中结合的单宁类成分产生络合,使交联作用增强,从而显著提高成革的热稳定性能和机械性能。Pickled sheep skin was tanned by vegetable tanning agent extracted from Coriaria nepalensis bark combined with aluminum salt. The tanning process was optimized and a combined tanning method was established. The tanning properties and tanning mechanism of tanned leather were studied. The results showed that under the conditions of vegetable tanning agent dosage being 15% of the mass pickled skin, Al_(3)(SO_(4))_(2)·18 H_(2)O dosage being 20% of the mass pickled skin, penetration pH 4.0 and combined pH 4.5, the shrinkage temperature of tanned leather could reach 110.5 ℃. The tanned leather had good appearance properties, with a thickness increase rate of 82.2%±2.7%, tensile strength of(10.0±1.1) MPa, tear strength of(52.5±1.9) N/mm, elongation at break of 76.8%±3.3%, which was better than that of the tanned leather made by a combined tanning method from valonia vegetable tanning agent. After tanning, collagen fiber of leather became thicker and formed a tight network structure. Coriaria nepalensis bark vegetable tanning agent and aluminum salt could fully penetrate into the collagen fiber of leather and produce hydrogen bond cross-linking with them. During the combined tanning process, aluminum salt complexed with tannins in leather collagen fiber, which enhanced the cross-linking effect and significantly improved the thermal stability and mechanical properties of tanned leather.

关 键 词：马桑 植物鞣剂 结合鞣制 鞣制性能 鞣制机理 皮革化学品 

分 类 号：TS529.2[轻工技术与工程—皮革化学与工程]