二甲醚发动机中燃料与橡胶密封件的相容性研究  

Investigation on Compatibility of Rubber Sealing Parts with Fuel in Dimethyl Ether Engine

作　　者：李跟宝[1] 周龙保[1] 柳泉冰[1] 潘克煜[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2005年第3期317-320,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金重点资助项目( 50122166 );科技部重大基础研究资助项目( 2001CB209207 );科技部清洁汽车项目(2003BA408B12B).

摘　　要：为了解决二甲醚燃料在发动机中的密封问题,开展了二甲醚燃料与橡胶密封件的相容性研究.分析了橡胶在二甲醚中溶胀的化学机理,并选出具有不同极性的橡胶材料进行耐二甲醚溶胀及溶胀前后拉断强度、拉断伸长率、硬度等力学性能的对比试验.试验发现:在含润滑添加剂(植物油)的二甲醚燃料中经过 72 h浸泡后,氟橡胶和丁腈橡胶的溶胀率和力学性能变化均比氟硅橡胶显著;氟硅橡胶在更长时间(40 d)的燃油浸泡后溶胀率最低,力学性能几乎没有变化.试验结果表明,氟硅橡胶可以很好地满足二甲醚发动机对橡胶密封件的要求.The compatibility of rubber sealing parts with Dimethyl ether (DME) in a compression ignition engine was studied. Chemical mechanism of rubber expansion in DME was analysed, and different rubber materials were selected to test the expansion, the tensile strength, the elongation at break, and the hardness. Comparative experiments show that fluorosilicone rubber (FMQ) exhibited little change in its mechanical properties and just a slight expansion was observed after a long time (40 days) immersing in DME blend (DME mixing with vegetable oil as lubricant). The results indicate that FMQ could well meet the material requirement of seals for DME engines.

关 键 词：二甲醚 橡胶 溶胀 

分 类 号：TQ[化学工程] TQ517