A kind of composite lubricating composition and lubricating material

A technology for lubricating compositions and lubricating materials, applied in the direction of lubricating compositions, additives, petroleum industry, etc., can solve the problems of surfactant layer damage, limited bearing capacity, narrow range, etc., and achieve reduced viscosity and shear resistance, bearing The effect of good ability and good lubricating performance

Active Publication Date: 2021-07-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is to cause the orderly arrangement of liquid crystal molecules by applying an electric field or magnetic field, but when this method is used in a non-charged or magnetic environment, the liquid crystal molecules will lose this characteristic
Another way is to use a surfactant on the surface of the friction pair in advance as an alignment layer to induce the orientation of the liquid crystal molecules, but because wear is generally unavoidable during the friction process, and the surfactant layer will shrink as the friction movement time increases. Gradual damage will eventually lead to the disappearance of liquid crystal alignment ability, so it has no lubricating effect
In addition, existing studies have shown that molecules with a rod-like non-liquid crystal structure have a certain orientation ability under the condition of forming a chemical adsorption layer on the surface, but because the intermolecular force is not strong enough, the formed molecular orientation can only be maintained at a few. A molecular layer, so it cannot form a long-range ordered structure like a real liquid crystal molecule, so its carrying capacity is limited, and the range of ultra-slippery conditions that can be achieved is narrow.

Method used

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  • A kind of composite lubricating composition and lubricating material
  • A kind of composite lubricating composition and lubricating material
  • A kind of composite lubricating composition and lubricating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] With the β-diketone (wherein, R as described in formula (1) molecular structural formula 1 =-C 2 h 5 , R 2 =-C 6 h 13 ) was dropped on the steel plate and heated to 180°C for about 5 minutes to simulate the implementation of tribochemical reactions. After the reaction, the remaining β-diketone was washed away with acetone to obtain a chemical adsorption layer.

[0026] Among them, R 1 =-C 2 h 5 , R 2 =-C 6 h 13 .

[0027] The contact angle test of water droplets is carried out on the surface of the steel plate with chemical adsorption layer and the unreacted steel surface, such as figure 1 As shown, it was found that the contact angle of the steel disc with the chemical adsorption layer increased significantly. After calculation, the chemical adsorption of the β-diketone of the present embodiment can change the contact angle of the steel plate from 41mJ / m 2 Reduced to 37mJ / m 2 . Combined with the FCK rule according to the orientation of liquid crystals...

Embodiment 2

[0033]The difference between this example and Example 1 is that in the chemical structural formula of β-diketone in this example, R1 and R2 are the same, both being -C 3 h 6 COOCH 3 , the content of β-diketone in the compound oil of 5CB and β-diketone is 15wt%. Other steps, reagents and parameters are the same as in Example 1.

[0034] By testing the contact angle of water droplets before and after the β-diketone modification of the steel surface in this embodiment, the contact angle increases from 72.4° to 83.1° before the β-diketone modification. Using the β-diketone of this embodiment The chemical adsorption layer formed on the surface of the ketone-treated steel disk made the contact angle of the steel disk significantly increased.

[0035] Using 5CB on the surface of the β-diketone modified steel in this embodiment, the storage modulus G' of the steel disk surface is tested by viscoelasticity through a rotational rheometer, and the conditions are: reciprocating frequen...

Embodiment 3

[0038] The difference between this embodiment and embodiment 1 lies in that the liquid crystal base oil used is MBBA. Other steps, reagents and parameters are the same as in Example 1. The reduction of the surface energy of steel by the β-diketone prepared in this example was confirmed by the contact angle test, and the contact angle increased from 72.4° before modification to 86.0°. The viscoelasticity of MBBA on the surface of modified steel was confirmed by rotational rheometer, and its storage modulus was almost zero compared with that of unreacted steel plate (10 -4 order of magnitude) increased to 11Pa. The super-slip performance of 5CB / β-diketone has been confirmed by the multifunctional friction testing machine. Under the constant contact pressure of 20MPa, the minimum super-slip speed is extended from 220mm / s of pure β-diketone to 121mm / s; at a constant speed of 400mm / s , the maximum contact pressure of ultra-smooth is expanded from 22MPa to 27MPa. After the rubbin...

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Abstract

The invention provides a composite lubricating composition and a lubricating material. The components of the composite lubricating composition are liquid crystal molecules with a rod-like molecular structure and β-diketone. The structural formula of the β-diketone is shown in (1) , in formula (1), R 1 for C m h 2m+1 、C m h 2m OCH 3 or C m h 2m+1 COOCH 3 , R 2 for C n h 2n+1 、C n h 2n OCH 3 or C n h 2n+ 1 COOCH 3 , where m and n are positive integers. The technical scheme of the present invention utilizes the molecular characteristics of liquid crystal molecules with a rod-like molecular structure and β-diketone, and the two mix to produce a synergistic effect; when used for lubricating the steel surface, the combination of mixing the two without shearing High viscosity and good load-carrying capacity; under shearing conditions, the rod-shaped liquid crystal molecules and β-diketones are arranged in the horizontal direction, which reduces the viscosity and shear resistance, and can achieve super slippery under a wider range of working conditions .

Description

technical field [0001] The invention belongs to the technical field of lubricating materials, in particular to a composite lubricating composition and lubricating materials. Background technique [0002] Liquid crystal lubricant is a new type of lubricating material, which can simultaneously have high load-carrying capacity and low shear resistance through molecular orientation, so as to achieve controllable rheological and tribological properties. Generally speaking, the molecular orientation of liquid crystal materials can be realized in two ways. One is to cause the orderly arrangement of liquid crystal molecules through an external electric field or magnetic field, but when this method is used in a non-charged or magnetic environment, the liquid crystal molecules will lose this characteristic. Another way is to use a surfactant on the surface of the friction pair in advance as an alignment layer to induce the orientation of the liquid crystal molecules, but because wear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M141/06C10N30/06
CPCC10M141/06C10M2207/08C10M2207/285C10M2215/06C10M2215/16
Inventor 李克袁成清
Owner WUHAN UNIV OF TECH
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