Sulfur, Nitrogen Boric Acid Esters And Rapeseed Oil In The Tribological Properties Of Study

The increasing attention on the environmental protection and more restrictive environmental regulations drives the lubricant industry to develop novel potential environmental friendly lubricants and additives. Traditional rapeseed oil not only possess good lubricating property and high-biodegradability, but also their resources can be recycled. Its extreme pressure (EP), antiwear, antioxidant, and anticorrosion properties can be increased by adding series functional additives, such as EP additive, antiwear agent, antioxidant to suit industry requirements.From molecular design, three series, 9 kinds of additives have been designed and synthesized by using morpholine compound as material. Their main chemical structures were characterized by using IR, EA. Their tribological properities, sensitivity and compatibility among additives and base oils were studied by a series of texts.Specific study contents are as follows:(1) 9 kinds of additives wre designed and synthesized.di-n-butylamin-edithio-n-butyl borate;di-n-butylamin-edithio-n-octyl borate;di-n-butylamin-edithio-i-octyl borate;morpholine-edithio-n-butyl borate;morpholine-edithio-n-octyl borate;morpholine-edithio-n-octyl borate;morpholine-edithio-n-lauril borate;morpholine-n-butyl borate;morpholine-n-octyl borateTheir main chemical structures were characterized by using IR, EA.(2) In this paper, we had studied their oil solubility and copper corrosion and anti-oxidation. Furthermore, the relationship worked out by this study of solubility, copper corrosion and anti-oxidation with the structure and composition of lubricants were studied. Results indicated that besides morpholine-n-butyl borate and morpholine-n-octyl borate,7 kinds of additives all possesed good oil solubility, anti-copper corrosion, anti-oxidation and biodegradability.(3) The extreme-pressure, friction-reducing and anti-wear properties of rapeseed oil with borates as additives were studied by MRS-10A four-ball test machine. The results showed that 9 kinds of additives can increase the anti-wear and extreme pressure properties and friction coefficient decreased greatly. The oil sample containing 2.0%SONB-1 and 2.0% SONB-2 show excellent loading ability, whose maximum non-seizure load was 1.8 times as much as that of base oil, and the oil sample containing 3.0% MONB-1 had good antiwear properties, whose WSD was 0.63 times as much as that of base oil ,and the friction coefficient of the oil sample containing 3.0% MONB-1 was 0.69 times as much as that of base oil.(4) Their tribological mechanisms were also investigated by using XPS, SEM/EDS etc analytic instruments. And the film can prevent the direct contact of metal and metal, to reduce the metal stock abrasion. The results indicate that surfacial films mainly composed of adosorption, deposition containing Fe₂(SO₄)₃, FeS₂ and borate.