聚硫密封剂在航空煤油中的老化机理  

Aging Mechanism of Polysulfide Sealant in Jet Fuel

作　　者：吴松华[1] 益小苏[1] 秦蓬波[1] 王景鹤[1] 过梅丽[2] 

机构地区：[1]北京航空材料研究院,北京100095 [2]北京航空航天大学,北京100083

出　　处：《航空材料学报》2007年第6期79-82,共4页Journal of Aeronautical Materials

摘　　要：针对聚硫密封剂在航空煤油中的严重老化,通过性能检测、化学分析和仪器分析等手段,研究聚硫密封剂在航空煤油中的老化行为特点,航空煤油在高温空气中的化学变化以及该变化对聚硫密封剂的影响。分析导致聚硫密封剂在航空煤油中严重老化的因素和机理。研究结果表明,聚硫密封剂在航空煤油中老化后强度与弹性都大幅下降,失重明显,这是热与氧共同作用的结果。具体过程是航空煤油首先在高温下被空气中的氧氧化,产生大量的过氧化物,且高温下航空煤油可以溶胀聚硫密封剂,使其吸氧速率大大提高,从而使降解与交联交织进行的热氧老化程度加剧。Polysulfide sealant is seriously aging in aeronautic jet fuel. The feature of aging proceeding of polysulfide sealant in jet fuel, chemical change of jet fuel in the high temperature air, and the effect of such change on polysulfide sealant were studied by the means of function detection, chemical analysis, and instrumental analysis. The factors and mechanism which induce seriously aging of polysulfide sealant in jet fuel were analyzed. The results shows that effect of both heat and oxygen leads strength and elasticity of polysulfide sealant to decrease greatly in jet fuel, and obvious weightlessness. The specific process was, at first ,jet fuel was oxidized by oxygen in air, peroxide was greatly produced; then polysulfide sealant could be swellinged by hot jet fuel, its velocity of absorbing oxygen increased enormouslu, so degradation and cross-link interlaced to happen.

关 键 词：聚硫密封剂 老化 机理 

分 类 号：TB324[一般工业技术—材料科学与工程]