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| Effects of dimer acid antiwear agent on lubricity of jet fuel |
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| DOI： |
| KeyWord:dimer acid jet fuel lubricity wear scar diameter |
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| Abstract: |
| In order to investigate the improvement of lubricity of dimer acid antiwear agents on jet fuel and verify the improvement effects of different dimer acids antiwear agents,dimer acids were synthesized and refined from tung oil, cottonseed oil and tall oil fatty acids, respectively, and their molecular structures were verified by liquid chromatography, FT-IR spectrometer and NMR spectrometer. The effects of cottonseed oil-based dimer acid, tung oil-based dimer acid and tall oil fatty acids-based dimer acid on the lubricity of jet fuel were investigated by BOCLE and HFRR tests. The wear scar morphology of the test ball was analyzed by measuring microscope and the antiwear mechanism was proposed. The results showed that with the increase of the dosage of dimer acid, the wear scar diameter, surface scratch and depth decreased. In BOCLE test, 20 mg/L dosage of dimer acids from three different raw materials could reduce the wear scar diameter of jet fuel from 0.92 mm to less than 0.65 mm ,meeting the requirement of GB 6537-2018 No.3 jet fuel. In HFRR test, when the dosage of three dimer acids was 50 mg/L, the wear scar diameter of lubricity and the average friction coefficient could be reduced below 550 μm and 0.265 respectively, and the average film formation rate could reach above 24%. The variation of the average friction coefficient and average film formation rate was consistent with the improvement rule of dimer acid on the lubricity of jet fuel. The dimer acids prepared had long carbon chains and carboxyl functional groups. The carboxyl group was adsorbed on the metal surface through strong electronegativity, the hydrogen bond with carboxyl groups and the non-polar end through Van Der Waals force made the dimer acid molecules form parallel molecular clusters, and then formed an effective lubrication film on the metal surface to prevent direct contact and friction between the two friction pairs. In conclusion, the three dimer acids have the uniform lubrication ability, and show good lubrication performance. |
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