A kind of polyhydroxy functionalized ionic liquid lubricant and preparation method thereof

A technology for ionic liquids and lubricants, applied in chemical instruments and methods, lubricating compositions, hydrotalcites, etc., to achieve the effects of strong practicability, reduced wear, and superior performance

Active Publication Date: 2022-04-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is currently difficult to find an acid like phosphoric acid that can satisfy the second condition at the same time. There are multiple hydroxyl groups on the molecule that can form hydrogen bonds.

Method used

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  • A kind of polyhydroxy functionalized ionic liquid lubricant and preparation method thereof
  • A kind of polyhydroxy functionalized ionic liquid lubricant and preparation method thereof
  • A kind of polyhydroxy functionalized ionic liquid lubricant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Add magnesium nitrate hexahydrate, aluminum nitrate nonahydrate and urotropine into water to obtain a mixed solution, wherein the concentrations of magnesium nitrate hexahydrate, aluminum nitrate nonahydrate and urotropine are 0.032mol / L and 0.016mol respectively / L, 0.042mol / L;

[0035] 2) Transfer the mixed solution of step 1) to a hydrothermal kettle, heat in a vacuum box at 150°C for 30 hours, then cool to room temperature at 25°C, take out the suspension, filter it, and wash with ethanol reagent;

[0036] 3) The slurry after step 2) was first dispersed in an acetone solvent with a solid-to-liquid ratio of 1 wt%, and after the slurry was collected by centrifugation, it was again dispersed in cyclohexane reagent with a solid-to-liquid ratio of 1 wt% to obtain a colloidal solution;

[0037] 4) Place the colloidal solution in step 3) in a freeze-drying device for 24 hours to obtain the following: figure 1 (a) Hydrotalcite nanosheets (1500-3000nm in lateral dimensio...

Embodiment 2

[0040] 1) Disperse the ionic liquid of 1-butyl-2,3-dimethylimidazolium tetrafluoroborate in the proportion of 5wt% in the ethylene glycol organic reagent to obtain the ionic liquid lubricant.

[0041] 2) Add the hydrotalcite nanosheets prepared in Example 1 as an additive to the ionic liquid lubricant at a mass fraction of 1 wt%, and stir and disperse to obtain a polyhydroxy functionalized ionic liquid lubricant.

[0042] The lubricant prepared above was tested using the ball-on-disk reciprocating mode of the UMT5 friction and wear testing machine. The friction sample is composed of a silicon nitride ball and a sapphire sheet (the elastic modulus and Poisson's ratio of silicon nitride are 300GPa and 0.27 respectively, and the elastic modulus and Poisson's ratio of sapphire are 340GPa and 0.25 respectively), and the indoor ambient humidity is 30 %, the diameter of the upper sample is 14mm. The friction test was carried out under a load with a frictional force of 12N and a slid...

Embodiment 3

[0045] The physical morphology and structural changes of the contact surface will directly affect the superlubrication behavior under high contact pressure, so it is necessary to further study the wear degree of the friction pair of the lubricant with hydrotalcite nanosheets as an additive and pure ionic liquid. Under the same test conditions as in Example 2, the degree of wear formed by the frictional silicon nitride balls was observed through an optical microscope and a three-dimensional white light interferometer.

[0046] Compared with pure ionic liquid lubricants, the friction pairs of lubricants containing hydrotalcite nanosheets (with a thickness of 1 nm to 10 nm) have the smallest wear diameter, such as image 3 (b) The diameter shown in (b) is 110.4 μm, and the wear surface of the friction pair is relatively smooth, with a few cracks and small wear pits ( image 3 The surface roughness shown in (d) is 15 nm. Such as image 3 (a) and image 3 As shown in (c), non-dire...

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Abstract

The invention discloses a polyhydroxy functionalized ionic liquid lubricant and a preparation method, which belong to the technical field of lubricating materials. The lubricant is obtained by dispersing the hydrotalcite nanosheets in the ionic liquid lubricant. Hydrotalcite nanosheets are a layered polyhydroxy compound. Due to relatively weak internal bonding and interaction, they can improve the lubrication performance between friction pairs, effectively reduce the collision probability of rough peaks on the surface of friction pairs, and reduce the friction of sliding surfaces. wear and tear. The ionic liquid is combined with polyhydric alcohol, and the solution can be adsorbed on the surface of the friction pair to charge the surface and form a stern electric double layer. At the same time, the solution can form a hydrogen bond network structure and fix water molecules in the contact area. The hydrotalcite nanosheets can evolve into a dense protective friction film in the contact area of ​​the friction pair. The hydrotalcite in the contact area can effectively avoid the direct contact of the rough peaks, greatly improve the anti-wear performance of the friction pair, and realize the ultra-thickness of the lubricating fluid. High load capacity.

Description

technical field [0001] The invention belongs to the field of lubricating materials, in particular to a polyhydroxy functionalized ionic liquid lubricant and a preparation method. Background technique [0002] In the era of high industrialization, the consumption of energy and materials due to friction and wear still occupies an important position that cannot be underestimated. At the same time, due to the relatively large surface of the micro-nano system, surface and interface forces such as friction, adhesion, surface tension, and electrostatic force become key factors affecting system performance. Especially in the context of the penetration of micro-nano systems into medical, aerospace, military and other fields, it is of epochal significance to reduce wear, reduce energy consumption, and greatly increase the service life of transfer components. At present, the development of an environment-friendly lubricating fluid with ultra-high load capacity has become an important ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M169/04C01F7/00B82Y40/00C10N30/06
CPCC10M169/04B82Y40/00C10M2201/062C10M2207/0225C10M2215/224C10M2201/14C01P2004/24C01P2004/03C01P2004/04C01F7/785
Inventor 王鲲鹏刘宇宏刘磊祁亚峰
Owner TSINGHUA UNIV
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