| A large amount of waste cooking oil is generated during our daily life,which will seriously pollute the environment if it is improperly disposed of.As one of the recyclable resources,vegetable oil,the main component of waste cooking oil,has good lubricity and biodegradability.It can be used as raw material to prepare lubricating oil additive through chemical means.In order to find out the rules,soybean oil was used as the model compound of waste food oil.The nitrogen containing borate ester anti-wear additive was prepared by alkali hydrolysis,amidation and esterification.The tribological properties and combinationeffect were evaluated.Then the anti-wear additive and commercial additive were formulated and applied to anti-wear hydraulic oil,the optimized formula of the additive was explored using fuzzy mathematics comprehensive evaluation.Fatty acid is prepared by alkaline hydrolysis of soybean oil through a two-step method,and then N and B atoms are introduced successively through amidation and esterification to form NB coordination bonds to prepare fatty acid diisopropanolamine borate(abbreviation:FADB).A single factor experiment was designed to explore the optimal reaction conditions.The hydrolysis rate of soybean oil was 97.94%,the conversion rate of fatty acid was 90.69%,and the yield of borate ester was 83.21%.The structure of the target product was confirmed by infrared spectroscopy.Determining the performance of FADB:the hydrolysis stability was measured by glass bottle method;Oxidation stability was determined by high pressure differential scanning calorimetry.The corrosion of copper was determined by GB/T 5096.Tribological experiments have found that FADB has different oil solubility and sensitivity in different base oils,which can affect its tribological properties to varying degrees.The tribological properties of FADB in different base oils(150SN,150N,No.6 oil)were evaluated.It was found that FADB had better anti-wear properties in 150SN and 150N.The extreme pressure properties with 150SN,150n and No.6 oil were improved at different levels.The suitable base oil for FADB was 150SN.The optimum FADB treat rate is 2%,which reduced the wear scar by 39.61%using 150SN,and the maximum.non-seizure load was increased by 31%,which can significantly improve the extreme pressure wear resistance of base oil.The combination of FADB and extreme pressure anti-wear additive.The best combination ratio of FADB and T321 was 3:2,with a wear scar diameter of 0.480mm and maximum non-seizure load of 862N.The results show that the combination ratio of FADB and T305 is 1:4 and 1:1,with wear scar diameter of 0.481mm and maximum non-seizure load of 1323N.The results show that the combination of FADB and T305 and T321 has a good synergistic effect in extreme pressure and anti-wear performance.FADB can provide good extreme pressure and anti-wear performance while reducing S,P and ash content in lubricant oil.Application of FADB in anti-wear hydraulic oil.150SN was selected as base oil,zinc diisooctyldithiophosphate as main additive(trade name T203),2,6-mixture of di tert-butyl phenol as antioxidant(trade name T502A),the prepared nitrogen containing borate ester as a anti-wear additive(FADB),and low base synthetic calcium sulfonate as rust inhibitor(trade name T104).The experimental results are processed through fuzzy mathematics comprehensive evaluation method to obtain optimized formula of anti-wear hydraulic oil additives:T203:0.52%,T502A:0.24%,FADB:0.12%,T104:0.12%.The performance of the oil products with this formula meets the requirements of anti-wear hydraulic oil. |
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