In the paper,to further improve the tribological properties of gear oil CKD 320,three green and environmentally friendly boron-containing additives with different functional groups,i.e.carbon-chain saturated stearic acid diethano-lamide borate(C18),oleic acid diethanolamide borate with C=C double bonds(C18∶1)and ricinoleic acid diethanolamide borate with polar hydroxyl groups and double bonds(C18∶1OH),were designed and prepared.By adjusting the polarity of borate ester lubricant additives,the effect of borate ester polarity on the tribological properties of gear oil CKD 320 was stud-ied.The results show that three kinds of borate ester additives can improve the friction reduction and anti-wear properties and load-carrying capacity of gear oil CKD 320 without changing the physical and chemical properties.The stronger the po-larity of borate ester,the easier it is to absorb on the friction surface,and the higher the wear resistance.
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