Sodium amide lubricating grease and perfluoropolyether lubricating grease were prepared to meet the higher requirements of the performance of lubricating grease in the harsh working conditions of aerospace equipment,and the long-life low-volatile grease was prepared by adding antioxidant,antirust agent and extreme pressure antiwear agent,etc.The physical and chemical properties,lubrication properties,bearing life and rheology properties of commercial amide soap-based grease and the long-life low-volatility grease were studied.The results showed that compared with commercial amide soap-based grease,the long-life low-volatile ester had less loss at high temperature and lower oil separation ratio,which indicated that it had better colloidal stability.The wear spot diameter of the long-life low-volatile grease test steel ball was 0.46 mm,which was much lower than 1.03 mm of commercial amide grease.The bearing life was as long as 1 228 h,which was much longer than 760 h of commercial amide grease.These results showed that it had better extreme pressure and antiwear performance,lubrication performance and oxidation stability,and had a wider linear viscoelastic region and a stronger structure retention ability at high temperature.Therefore,the long-life low-volatility grease has excellent comprehensive performance and can be used for lubrication of equipment under various special working conditions.
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