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Super-lubricating composition based on beta-diketone and cellulose nanocrystals and super-lubricating material

A cellulose and nanocrystalline technology, used in lubricating compositions, base materials, petroleum industry, etc., can solve the problems of poor performance, narrow working conditions, limited bearing capacity, etc., and achieve obvious shear thinning characteristics, wide ultra Slip condition range, the effect of reducing viscous resistance

Active Publication Date: 2020-11-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its own viscosity is low, its performance is poor under boundary lubrication conditions, and its bearing capacity is limited. The range of loads and working conditions that can achieve super-slip is narrow, which cannot meet the requirements of use.
As nanoparticles, cellulose nanocrystals (CNC) can be added to the base oil as an additive to repair the surface. However, because cellulose nanocrystals are easy to settle, they can only be used in lubricating base oils with high viscosity. And even with surface modification, dispersion stability in low-viscosity base oils remains problematic

Method used

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  • Super-lubricating composition based on beta-diketone and cellulose nanocrystals and super-lubricating material
  • Super-lubricating composition based on beta-diketone and cellulose nanocrystals and super-lubricating material
  • Super-lubricating composition based on beta-diketone and cellulose nanocrystals and super-lubricating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] with R 1 =C 3 h 7 , R 2 =C 5 h 11 The β-diketone is the base oil, with R=C 6 h 11 β-diketone and mCNC were respectively dissolved in amylacetophenone with amyl acetophenone as an additive, and β-diketone and mCNC were respectively dissolved in pentyl acetophenone, and then mixed again, and the solvent was evaporated to obtain uniformly dispersed β-diketone / mCNC Composite oil, wherein the doping amount of mCNC is 0.5wt%. At the same time, the corresponding PAO2 / mCNC composite oil was prepared with the low-viscosity oil PAO2 as the base oil, as a comparative example.

[0040] Rheological tests were performed on β-diketone, β-diketone / mCNC, PAO2 and PAO2 / mCNC with a rotational rheometer, and the results were as follows figure 1As shown, it can be seen that β-diketone has a higher viscosity than PAO2 at a low shear rate. After mCNC is added, the molecular chains grafted on its surface can entangle with β-diketone to form a physically cross-linked network structure ...

Embodiment 2

[0044] The difference between this embodiment and embodiment 1 is: in the chemical structural formula of the β-diketone adopted, R 1 =R 2 =C 4 h 8 OCH 3 , in the chemical structural formula of mCNC used R=C 4 h 8 OCH 3 . Other steps, reagents and parameters are the same as in Example 1, wherein the content of mCNC is 5wt%.

[0045] The rheological properties of the β-diketone / mCNC prepared in this example were confirmed by a rotational rheometer, and at 0.1s -1 At a certain shear rate, the viscosity of β-diketone can be raised from 90mPa·s to 172mPa·s; -1 Keep the low viscosity of β-diketone 8mPa·s. The dispersion stability of β-diketone / mCNC was confirmed by a 30-day anti-sedimentation test; the super-slip performance of β-diketone / mCNC was confirmed by a multifunctional friction tester. The minimum sliding speed has been expanded from 230mm / s to 160mm / s.

Embodiment 3

[0047] This example differs from Example 1 in that: in the process of doping mCNC into β-diketone, ethyl 2-methylbenzoate is used as the intermediate solvent, and the doping amount of mCNC is 1 wt%. Other steps, reagents and parameters are the same as in Example 1. The rheological properties of the β-diketone / mCNC prepared in this example were confirmed by a rotational rheometer, and at 0.1s -1 At a certain shear rate, the viscosity of β-diketone can be raised from 98mPa·s to 190mPa·s; -1 Keep the low viscosity of β-diketone 8mPa·s. The dispersion stability of β-diketone / mCNC was confirmed by a 30-day anti-sedimentation test; the super-slip performance of β-diketone / mCNC was confirmed by a multifunctional friction tester. The minimum sliding speed has been expanded from 220mm / s to 145mm / s.

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Abstract

The invention provides a super-lubricating composition and a super-lubricity material based on betadiketone and cellulose nanocrystals. The super-lubricity composition comprises the following components: betadiketone and modified CNC, the molecular structural formula of the beta diketone is shown as a formula (1), in the formula (1), R1 is CmH2m+1, CmH2mOCH3 or CmH2m+1COOCH3, R2 is CnH2n+1, CnH2nOCH3 or CnH2n+1COOCH3, and m and n are positive integers; the molecular structural formula of the modified CNC is shown as a formula (2), in the formula (2), an R chain is OOCxH2x+1, OOCxH2xOCH3 or OOCxH2x+1COOCH3, and x and y are positive integers. By the adoption of the technical scheme, the high-viscosity polyurethane elastomer has high viscosity at a low speed, and the bearing capacity is better. According to the invetion, the viscosity is rapidly reduced at a high speed, the viscous resistance is reduced, and the super-lubricating working condition range is enlarged.

Description

technical field [0001] The invention belongs to the technical field of lubricating materials, in particular to a super-slip composition and a super-slip material based on beta-diketone and cellulose nanocrystals. Background technique [0002] Friction and wear are an important cause of energy loss and failure of mechanical components. According to statistics, about 1 / 4 of the world's primary energy is lost due to friction, and 80% of device failures are caused by wear. While bringing huge economic losses, it also causes environmental pollution and even irreparable waste of resources. In recent years, a large number of studies have shown that superslip is a good way to overcome energy loss and loss caused by friction and wear. [0003] β-diketone is a synthetic lubricating oil that can achieve super slip because of its coefficient of friction <0.01. However, its own viscosity is low, its performance is poor under boundary lubrication conditions, and its bearing capacity...

Claims

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Application Information

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IPC IPC(8): C10M111/04C10M169/02C10N30/06C10N30/02C10N50/10
CPCC10M111/04C10M169/02C10M2207/085C10M2207/1285C10M2209/123
Inventor 李克袁成清
Owner WUHAN UNIV OF TECH
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