A kind of vacuum lubricating grease was prepared by using perfluoropolyether as base oil,perfluorinated polymer as thickener,and self-made additives.The colloidal stability of the grease was greatly improved by introd...A kind of vacuum lubricating grease was prepared by using perfluoropolyether as base oil,perfluorinated polymer as thickener,and self-made additives.The colloidal stability of the grease was greatly improved by introducing a colloidal structure modifier.The rheological properties of the self-made grease(SMG),such as viscosity versus time,thixotropy,etc.,were studied by a rheometer at different temperatures and were compared with those of foreign brand grease(FBG).The results show that the performance of SMG reached the level of similar FBG,and some properties such as mechanical stability,colloidal stability,extreme pressure and antiwear properties were better.It can be used for long life lubrication of moving parts in a vacuum environment.展开更多
In order to solve the hardening problem of complex calcium lubricating grease, the water absorption test of several calcium salts was carried out, and it was found that calcium 12-hydroxystearate did not absorb water,...In order to solve the hardening problem of complex calcium lubricating grease, the water absorption test of several calcium salts was carried out, and it was found that calcium 12-hydroxystearate did not absorb water, and calcium acetate, calcium phosphate and calcium borate had different degrees of water absorption. Calcium acetate has the highest water absorption rate, while calcium phosphate and calcium borate show comparable water absorption rates. Upon using the molecular simulation technology, it is found that in the complex calcium grease system, calcium phosphate and calcium borate tend to combine with water, which inhibits the water absorption of calcium acetate and alleviate the hardening problem.展开更多
The dropping point,cone penetration,corrosion,oil separation rate and oxidation stability of lithium grease prepared by two different processes at room temperature and high temperature were measured.The rheological pr...The dropping point,cone penetration,corrosion,oil separation rate and oxidation stability of lithium grease prepared by two different processes at room temperature and high temperature were measured.The rheological properties of the samples were studied and analyzed with the microstructure of soap fiber.The results show that the content of thickener used in grease prepared by the room temperature method is higher in order to obtain the same consistency.The dropping point and evaporation loss of grease samples prepared by two processes are similar,and the oil separation rate of the lubricating grease prepared by the room temperature method is smaller.The preparation process has a great influence on the rheological properties of grease,and the higher content of thickener is beneficial to improving the rheological properties of grease.展开更多
文摘A kind of vacuum lubricating grease was prepared by using perfluoropolyether as base oil,perfluorinated polymer as thickener,and self-made additives.The colloidal stability of the grease was greatly improved by introducing a colloidal structure modifier.The rheological properties of the self-made grease(SMG),such as viscosity versus time,thixotropy,etc.,were studied by a rheometer at different temperatures and were compared with those of foreign brand grease(FBG).The results show that the performance of SMG reached the level of similar FBG,and some properties such as mechanical stability,colloidal stability,extreme pressure and antiwear properties were better.It can be used for long life lubrication of moving parts in a vacuum environment.
文摘In order to solve the hardening problem of complex calcium lubricating grease, the water absorption test of several calcium salts was carried out, and it was found that calcium 12-hydroxystearate did not absorb water, and calcium acetate, calcium phosphate and calcium borate had different degrees of water absorption. Calcium acetate has the highest water absorption rate, while calcium phosphate and calcium borate show comparable water absorption rates. Upon using the molecular simulation technology, it is found that in the complex calcium grease system, calcium phosphate and calcium borate tend to combine with water, which inhibits the water absorption of calcium acetate and alleviate the hardening problem.
文摘The dropping point,cone penetration,corrosion,oil separation rate and oxidation stability of lithium grease prepared by two different processes at room temperature and high temperature were measured.The rheological properties of the samples were studied and analyzed with the microstructure of soap fiber.The results show that the content of thickener used in grease prepared by the room temperature method is higher in order to obtain the same consistency.The dropping point and evaporation loss of grease samples prepared by two processes are similar,and the oil separation rate of the lubricating grease prepared by the room temperature method is smaller.The preparation process has a great influence on the rheological properties of grease,and the higher content of thickener is beneficial to improving the rheological properties of grease.
