Tribological Properties And Hydrolysis Stability Study Of N-containing Heterocyclic Borate Derivative

With the development of human science and technology, the continuous advancement ofsociety, and environmental pollution and energy consumption problems become more andmore serious. So it is particularly important for the research and development ofmultifunctional lubricant additives. From now on, some researchers at home and abroad thatin order to seek the lubricant additives which properties are more stable, environmental andmore excellent performance joined in the field.This paper uses N-containing heterocyclic(such as2-Mercapro Benzothiazol andbenzotriazol) were used as raw material, and design and synthesis of their alcohol derivatives,then new N-containing heterocyclic borate derivatives were synthetized by ethanolamine andboric acid, and the tribological properties of borate derivatives as additives in basic oil(rapeseed oil) were studied by a testing machine, and the hydrolytic stability were measuredby the method which was improved open-method. And The relationship between its spatialstructure effect and Hydrolytic stability was studied by computational chemistry, all the sametime, the tribological mechanism was discussed by modern surface analysis method(SEM,EDS, XPS and so on). The main conclusions are as follows:1. The hydrolytic stability of borate ester derivatives can be increased effectively byN-containing compounds through coordination bonds, and borate ester derivatives which haveinternal coordination bonds have better hydrolysis stability than external coordination bonds.And then triethanolamine borate ester as additive, was added to rapeseed oil, and itstribological properties was investigated by a Four-ball testing. We found that it had excellentextreme pressure, antiwear and antifriction properties.2. Benzotriazol borate derivative as additive, was added to rapeseed oil, and its tribologicalproperties was investigated. We found that it had excellent extreme pressure, antiwear andantifriction properties, and some loads it can reduce the friction about50%, and the hydrolyticstability is the1220times than triethyl borate. The relationship between its spatial structureeffect and Hydrolytic stability was studied by computational chemistry, and it showed whenthe derivative had Nitrogen atom which has lone pair, the inside coordination bond can formbetween N atom and B atom, so the hydrolysis stability was increased through the molecularspace steric hindrance. Its tribological mechanism was explored by SEM, EDS and XPS, andthe results showed that the existence of active elements in this additive, such as B，N couldgreatly enhance the tribological properties of lubricant. 3. The tribological properties of the compound additive benzotriazol borate and TCP wereinvestigated by a four-ball testing machine, it exhibited great synergistic effects on theproperties of extreme pressure, antiwear and friction reduction properties. The elementcontent analysis of the surface of the worn steel ball was explored by SEM, EDS, and theresults showed that the existence of active elements in this additive, such as B, N, P couldgreatly enhance the tribological properties of lubricant.4. A borate ester containing2-Mercapro Benzothiazole as an additive, was added to rapeseedoil, and its tribological properties was investigated. We found that it had excellent extremepressure, antiwear and friction reduction properties, when the additive concentration is0.7wt%, the PBvalue is above190%than basic oil, and the hydrolytic stability is the1310times than triethyl borate. The relationship between its spatial structure effect and Hydrolyticstability was studied by computational chemistry, and it showed when the derivative hadNitrogen atom which has lone pair, the inside coordination bond can form between N atomand B atom, so the hydrolysis stability was increased through the molecular space sterichindrance. Its tribological mechanism was explored by SEM, EDS and XPS, and the resultsshowed that the existence of active elements in this additive, such as B, N, S could greatlyenhance the tribological properties of lubricant.5. The tribological properties of the compound additive2-Mercapro Benzothiazole borate andTCP were investigated by a four-ball testing machine, it exhibited great synergistic effects onthe properties of extreme pressure, antiwear and friction reduction properties. The elementcontent analysis of the surface of the worn steel ball was explored by SEM, EDS, and theresults showed that the existence of active elements in this additive, such as B, N, S, P couldgreatly enhance the tribological properties of lubricant.