氧化亚铁硫杆菌脱硫天然橡胶粉及其填充胶的性能  

Desulfurization of natural rubber ground rubber by thiobacillus ferrooxidans and properties of ground rubber filled vulcanizates

作　　者：姜广明[1] 赵素合[1] 罗婧源[1] 王雅琴[2] 俞汪洋[2] 

机构地区：[1]北京化工大学北京市新型高分子材料制备与加工重点实验室,北京100029 [2]北京化工大学生命科学与技术学院,北京100029

出　　处：《合成橡胶工业》2010年第4期271-275,共5页China Synthetic Rubber Industry

基　　金：国家自然科学基金资助项目(50673009);国家"八六三"计划项目(2006AA06Z367)

摘　　要：从铁矿土壤中分离出1株氧化亚铁硫杆菌,比较了其在不同Fe2+质量浓度的改进9 K培养基中的生长情况,确定最佳的天然橡胶胶粉加入时间为培养开始后的第30 h。利用氧化亚铁硫杆菌在较低Fe2+质量浓度的改进9 K培养基中进行脱硫实验,脱硫橡胶表面的傅里叶变换红外光谱、X射线光电子能谱分析和培养液中SO42-的浓度变化都表明氧化亚铁硫杆菌是通过氧化硫黄的代谢途径来断裂橡胶中的硫黄交联键。用该脱硫胶粉填充天然橡胶硫化胶的力学性能有一定程度的提高;通过扫描电子显微镜可以看出脱硫胶粉与天然橡胶基质的界面结合较好,应力集中点较少,脆断面的断裂线均匀。Thiobacillus ferrooxidans was screened from soil of iron mine.Its growth curves were compared when cultivated in modified 9 K medium with different ferrous concentrations.Natural rubber（NR） ground rubber was added into culture medium after 30 h incubation.Surface research of desulfurized NR by Fourier transform-infrared spectroscopy and X-ray photoelectron spectroscopy and analysis of SO2-4 in culture medium revealed that sulfur crosslinked bonds were ruptured via metabolic pathway of oxidizing sulfur by thiobacillus ferrooxidans,while rubber main chains kept intact.NR vulcanizates filled with desulfurized NR ground rubber obtained better mechanical properties,and scanning electron microscope observation showed that the interface bonding strength was higher,stress concentrators was less and breaking lines was more uniform than those filled with unincubated NR ground rubber.

关 键 词：氧化亚铁硫杆菌 天然橡胶 胶粉 生物脱硫 力学性能 

分 类 号：TQ332[化学工程—橡胶工业]