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.
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)
出处
《精细化工》
EI
CAS
CSCD
北大核心
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)。
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
Coriaria nepalensis
vegetable tanning agent
combined tanning
tanning performance
tanning mechanism
leather chemicals
作者简介
郭林新(1990-),男,博士生,E-mail:glx9933@foxmail.com;联系人:强涛涛(1980-),男,教授,E-mail:qiangtt515@163.com;联系人:马养民(1963-),男,教授,E-mail:mym63@sina.com。
