Tungsten Disulfide High Quality Lubricating Oil Additive

Tungsten disulfide is a gray-black hexagonal lattice-like material similar to graphite. Each layer is composed of two layers of sulfur atoms and one layer of tungsten atoms connected by the number of 2:1. Among them, sulfur and tungsten atoms are connected by strong covalent bonds. Sulfur atoms between layers are connected by van der Waals forces. The special crystal structure also makes tungsten disulfide more excellent than molybdenum disulfide lubricating oil additive of the same kind. Tungsten disulfide performs better in extreme pressure, wear and friction reduction, heat and oxidation resistance, etc.

The preparation method of tungsten disulfide composite extreme pressure antiwear agent includes the following steps:

According to the proportion: base oil 70%-90%; tungsten disulfide composite extreme pressure antiwear agent 0.5-1.5%; high temperature antioxidant 0.1-0.5%;

2-5.7% detergent, 3-5% dispersant, 5-10% viscosity index improver, 0.1-0.3% pour point depressant and 0.0001-0.0002% defoamer.

A.Under the condition of ultrasonic oscillation, the reaction of 0.4g precursor LixWS₂ with 1000ml distilled water was carried out.

B.Adjust the pH value to produce tungsten disulfide monolayer suspension with PH 7.

C.Adding 50 ml ionic liquid to the suspension and stirring at 65-75 ℃ for 24 hours at a certain temperature.

D.Solid products were separated by centrifuge with rotating speed of 2000 rpm.

E.Wash the product several times with a small amount of distilled water to determine the removal of LiOH and soluble substances.

F.Finally, the samples were washed with potassium tetrafluoroborate solution for several times and dried to obtain ionic liquid modified tungsten disulfide composite extreme pressure antiwear agent.

When tungsten disulfide is applied to engine oil, it can react with metal substrate chemically, and then produce FeS film with lower melting point, which can effectively reduce the contact between metal friction pairs and reduce the wear of metal surface. At the same time, tungsten disulfide can produce oxides slowly at high temperature. The formation of oxides can inhibit the further oxidation of tungsten disulfide, and the oxides formed also have lower friction coefficient and similar lubrication properties to tungsten disulfide, which can also reduce the wear between metal surfaces.

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