摘要
Abstract
Phosphorous pentaerythritol esters were prepared by a two-step synthesis process,with pentaerythritol,phosphorous acid,and fatty acids used as raw materials.Their structures were characterized by FTIR,NMR,and elemental analysis,and their high-temperature stability was further evaluated.The experimental results show that the first step of the esterification reaction proceeds at 170-185℃,and the reaction effect of the system without a catalyst is accessible to that of the sulfuric acid catalytic reaction system and superior to that of the stannous oxide system,indicating that phosphorous acid not only acts as a substrate but also plays a catalytic role in the reaction system.The second step of the esterification reaction proceeds at 220-230℃,and the reaction effect achieved by the phosphorous acid system without a catalyst is comparable to that of the stannous oxide system with the best catalytic performance,further indicating that phosphorous acid possesses an excellent autocatalysis ability.Compared with unmodified pentaerythritol ester by phosphorous acid(typical MIL-PRF-23699 standard base oil),the decomposition temperature of the lubricating oil containing phosphorus pentaerythritol ester has increased by about 76℃,and the oxidation temperature detected by HPDSC has increased by about 25℃.This indicates that phosphorous acid modification can effectively improve the high-temperature performance of lubricating oil containing pentaerythritol esters,expanding its application in the high-temperature field.关键词
高温性能/季戊四醇酯/酯化反应/亚磷酸/基础油/航空润滑油Key words
high-temperature performance/pentaerythritol ester/esterification reaction/phosphorous acid/base oil/aviation lubricating oil分类
化学化工
