Abstract
Two kinds of phenol- and N- containing borate ester, BTEB and BMEB have good hydrolysis stability due to the B-N coordination bond. The PB value improved by 60.7% and 67.6% respectively at 0.5wt% BTEB, BMEB in rapeseed oil. Their antiwear effect increases with the increase of adding content, and BMEB is better than BTEB. The friction-reducing effect of BTEB is better than BMEB. All additives formed a protective film which containing BOx, FeOx and other organic nitrogen compounds. The better capacities of BMEB may due to the complex boundary lubricating film which contain ferrous sulfate, ferrous sulfide. All additives possessed good antioxidation effect, and it increased the oxidation activation energy than rapeseed oil by 51.15% and 78.82% respectively at 0.25wt%.
Highlights
The traditional phosphorus-containing lubricant is restricted to use, so novel additive with efficient, phosphorus-free, ashless, antiwear and antioxidation ability [1] is the research focus
It can be seen that the peak at 3301 cm-1 (BTEB), 3201 cm-1 (BMEB) are the stretching vibration absorption peak of phenolic hydroxyl group, the peak at 2959 cm-1 (BTEB), 2958 cm-1 (BMEB) are the C-H bond stretching vibration peak, and the B-O stretching vibration absorption peak is at 1378 cm-1 (BTEB), 1378 cm-1 (BMEB), and the -C-N- absorption peak appears at 1020 cm-1
The following conclusions can be drawn from the above results: 1. The synthesized BTEB and B atom in BTEB (BMEB) had good store stability
Summary
The traditional phosphorus-containing lubricant is restricted to use, so novel additive with efficient, phosphorus-free, ashless, antiwear and antioxidation ability [1] is the research focus. Research mainly focused on introduction of electron-rich groups (such as nitrogen atom) into borate ester, to stabilize the electron-deficient of boron atom[6], and that can reduce the possibility of attack by some nucleophiles. It can enhance antiwear performance [7] for the synergetic effect between boron and nitrogen element. It improved the hydrolytic stability of borate esters by adding some amine compounds to form the extra-molecular-coordination bond, which was revealed by Small [8] and Papay [9]. Zheng [10] and Yao [11] introduced imido and aminoethyl groups into borate ester with a stable six-
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