Design and Preparation of Borate Ester Lubricating Additives and Study on Their Application in Gear Oil
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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