Published October 2009
The termostability of lubricants obtained on the base of cyclopolyols esters
G.N.GurbanovThe lubricants utilizated in present aviation engines is exposed to temperature operations in workinq at the hard efforts. There are not enough studing the thermodecomposition interval of lubricants. There fore it is difficult to predict it’s utilization in exploiting technician. It has actuality in the advices and studing about thermostability of lubricants obtained from esters. Because of the chemical stability dependences of lubricants on the base of esters obtained from cyclopolyols, the derivatography method was used for investigations it’s structure. In this purpose some ester of 2,2,5,5-tetramethylcyclopentanol (TMCP), 2,2,6,6-tetramethylcyclohexa-nol (TMCH), 1,1-dimethylcyclohexen-3, 2,2-dimethylbicyclo (2,2,1) hepten-5 have been selected and studied the thermoanalytic properties by derivatoqraphy method. It was determined that the pen-taesters of TMCH and TMCP, the silicon esters of TMCH are very stable. The thermostability of tetraesters of TMCH and TMCP are lower. The thermostability parameters of esters with izo-acids are lover. Because of the thermooxidation and decomposition ability of izo-acids are higher. The concerning esters composed from heteroatoms the silicon esters have higher thermostability than phosphorus esters. The comparison of pentakaproate ester with TMCH and pentaeritrite with pentakapron have shawn that the thermostability of first is higher than second; because of it is connected with cycle fragments. The temperature and masses changing in different structures have illustrated graphically and determined that there are 3 intervals of changing of temperatures. The changing of masses at first interval is slower, the second is fast and third is again slower. Thies the dependence of thermostability from chemical structure of esters have been studied and have shawn that the some ester has higher thermostability. The compounds have ability in engines working at higher temperature.