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A kind of liquid-solid mixed lubricant based on graphene strengthening and preparation method thereof

A technology of graphene and lubricants, which is applied in the field of high-temperature lubricants, can solve problems such as weakened wear resistance characteristics, achieve the effects of reduced friction coefficient, simple and easy preparation method, and reduced lubrication costs

Active Publication Date: 2019-10-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the prolongation of the friction time, the wear resistance of this type of lubricant shows a tendency to gradually weaken, which poses new challenges for the industrial application of polyphosphate high-temperature lubricants

Method used

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  • A kind of liquid-solid mixed lubricant based on graphene strengthening and preparation method thereof
  • A kind of liquid-solid mixed lubricant based on graphene strengthening and preparation method thereof
  • A kind of liquid-solid mixed lubricant based on graphene strengthening and preparation method thereof

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preparation example Construction

[0027] Such as Figure 1-Figure 4 As shown, the present invention provides a graphene-based liquid-solid hybrid lubricant and a preparation method thereof. The liquid-solid mixed lubricant includes 5.0-10.0% polyphosphate, 0.005-0.015% graphene, 5.0-10.0% sodium dihydrogen phosphate and 80.0-90.0% deionized water, and the polyphosphate is composed of potassium polyphosphate Mixed with sodium polyphosphate at a mass ratio of 2:1, the potassium polyphosphate includes potassium pyrophosphate, potassium tripolyphosphate and potassium metaphosphate, the sodium polyphosphate includes sodium pyrophosphate and sodium tripolyphosphate, the graphite Graphene is added in the solution in the form of graphene water dispersion liquid, wherein the thickness of the graphene sheet fragment of stable dispersion is about 50nm, and the structural molecular formula of described graphene is as follows:

[0028]

[0029] A preparation method based on graphene-enhanced liquid-solid hybrid lubrica...

Embodiment 1

[0034] Embodiment 1 formula sees the following table:

[0035]

[0036]

[0037] According to the weight ratio of the components in the above table: Dissolve 59.95g of sodium dihydrogen phosphate in 790.0g of constant temperature water at 40°C to obtain a primary solution, then mix 30.0g of potassium pyrophosphate and 40.0g of potassium tripolyphosphate at room temperature , 30.0g potassium metaphosphate mixed with 20.0g potassium pyrophosphate and 30.0g sodium tripolyphosphate were uniformly dissolved in the primary solution, stirred for 20 minutes, then the 5ml graphene aqueous dispersion with a concentration of 10mg / ml was added to the solution, and finally The graphene dispersion was subjected to water-bath ultrasonic dispersion treatment for 60 minutes to obtain the graphene-enhanced high-temperature environment-friendly liquid-solid hybrid lubricant of Example 1.

Embodiment 2

[0039] Embodiment 2 formula sees the following table:

[0040] serial number component name Weight (g) 1 potassium tripolyphosphate 100.0 2 sodium tripolyphosphate 30.0 3 Graphene 0.05 4 Sodium dihydrogen phosphate 69.95 5 Deionized water 800.0

[0041] According to the weight ratio of the components in the above table: dissolve 69.95g of sodium dihydrogen phosphate in 800.0g of constant temperature water at 40°C to obtain a primary solution, and then mix 100.0g of potassium tripolyphosphate and 30.0g of tripolyphosphoric acid at room temperature Sodium was mixed and dissolved in the primary solution evenly, stirred for 20 minutes, then 5ml of graphene aqueous dispersion with a concentration of 10 mg / ml was added to the solution, and finally the graphene dispersion was subjected to water-bath ultrasonic dispersion treatment for 60 minutes to obtain Example 2. High-temperature and environmentally friendly liquid-solid hybrid ...

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Abstract

The invention discloses a liquid-solid mixed lubricating agent based on graphene strengthening and a preparation method thereof. The liquid-solid mixed lubricating agent is prepared from the following raw materials in percent by mass: 10-15% of polyphosphate, 0.005-0.015% of graphene, 5-10% of sodium dihydrogen phosphate and 75-85% of deionized water. The preparation method of the lubricating agent comprises the following steps: firstly dissolving sodium dihydrogen phosphate into deionized water to obtain a primary liquid; then dissolving polyphosphate into the primary liquid; and finally adding graphene aqueous dispersion, and carrying out ultrasonic oscillation to obtain a finished product. The liquid-solid mixed lubricating agent disclosed by the invention has self-adaptability to carrying capacity, excellent antifriction property and good thermal stability and high temperature wear resistance durability and is extremely low in corrosivity on a base, green and pollution-free, so that the liquid-solid mixed lubricating agent has great market competitiveness.

Description

technical field [0001] The invention belongs to the technical field of high-temperature lubricants, and in particular relates to a graphene-based liquid-solid mixed lubricant and a preparation method thereof. Background technique [0002] In metal thermal processing such as hot rolling production process, under the conditions of high temperature (>650°C), high pressure (>2GPa), and high speed (>10m / s), the lubricating performance of the lubricant depends on the thermal stability of the lubricant itself properties and their physicochemical adsorption properties. Severe service conditions and the uncertainty of lubricants under these conditions put forward higher requirements for high-temperature lubricants. Polyphosphate can form a boundary lubricant film on the high-temperature friction interface, showing a good self-adaptive lubrication effect, and at the same time, tribochemically reacts with the oxide scale to form a layered film that can resist oxidation, reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M173/02C10M125/24C10N30/12C10N30/06C10N30/10C10N40/24
CPCC10M125/24C10M173/02C10N2030/06C10N2030/10C10N2030/12C10N2030/56C10N2040/24
Inventor 孔宁刘珊珊张杰李洪波
Owner UNIV OF SCI & TECH BEIJING
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