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Molybdenum disulfide quantum dot/graphene/polymer-based super-wear-resistant self-lubricating composite material and preparation method and application thereof

A technology of graphene composite and molybdenum disulfide, which is applied in the field of advanced composite material science, can solve the problems of high cost, large demand, and low yield, and achieve the effects of increasing yield, shortening reaction time, and promoting usability

Pending Publication Date: 2020-09-15
SHAANXI UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using only MoS 2 QDs to improve the tribological properties of polymer materials are in great demand and cost prohibitive
[0004] MoS 2 The application of QDs as lubricating fillers in polymer composite materials has not been reported so far, nor has there been any report on the use of quantum dots to modify graphene to prepare quantum dot / graphene composite particles and apply them to polymer-based friction materials.
In addition, the currently commonly used method of preparing MoS by liquid phase exfoliation 2 The method of QDs is simple and easy, and has excellent lubricating performance, but it usually takes a long time and the yield is low, generally only 1% to 15%.

Method used

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preparation example Construction

[0031] The invention provides a method for preparing a molybdenum disulfide quantum dot / graphene / polymer-based super wear-resistant self-lubricating composite material, which specifically includes the following steps:

[0032] Step 1: Molybdenum disulfide quantum dots (MoS 2 Preparation of QDs)

[0033] 1 to 5 copies of MoS 2 The powder is dispersed into a single organic solvent / mixed organic solvent, and after ultrasonic treatment at a certain power for a certain period of time, the reaction mixture solution is transferred to a high-temperature and high-pressure reactor for a certain period of time. After cooling to room temperature, the reaction product is centrifuged at a certain speed for a certain period of time, and the supernatant obtained by the centrifugation is the prepared solution containing molybdenum disulfide quantum dots.

[0034] Step 2: Molybdenum disulfide quantum dots / graphene (MoS 2 Preparation of QDs / G) composite particles

[0035] First, 1 part of gr...

Embodiment 1

[0053] Step 1: Share 1 MoS 2 The powder was dispersed into 50 parts of N,N-dimethylformamide and stirred evenly. After ultrasonic treatment at 200W for 2 hours, the reaction mixture was transferred to a high-temperature and high-pressure reactor at 150°C for 3 hours. After cooling to room temperature, the reaction product was centrifuged at 8000r / min for 20min, and the supernatant obtained from the centrifugation was the prepared MoS 2 QDs solution.

[0054] Step 2: First, combine 1 share of GO with 1 share of MoS 2 QDs were mixed and added to 500 parts of ethanol and water mixed solvent (volume ratio 5:4) and ultrasonically stirred for 0.5h. Next, after stirring at room temperature for 6 hours, 1 part of hydrazine hydrate was added, condensed and refluxed at 100°C for 6 hours, after it was cooled to room temperature, it was suction filtered and washed several times with deionized water. Finally, it is freeze-dried to obtain MoS 2 QDs / G composite particles.

[0055] Step ...

Embodiment 2

[0058] Step 1: Share 2 copies of MoS 2 The powder was dispersed into 250 parts of N-methyl-2-pyrrolidone and stirred evenly. After ultrasonic treatment for 2.5 hours at a power of 200W, the reaction mixture was transferred to a high-temperature and high-pressure reactor at 160°C for 3 hours. After cooling to room temperature, the reaction product was centrifuged at 10000r / min for 30min, and the supernatant obtained by filtration and centrifugation was the prepared MoS 2 QDs solution.

[0059] Step 2: First, combine 1 GO with 2 MoS 2 QDs were mixed and added to 500 parts of ethanol and water mixed solvent (volume ratio 5:4) and ultrasonically stirred for 1 h. Next, after stirring at room temperature for 12 hours, 1.5 parts of hydrazine hydrate was added, condensed and refluxed at 100°C for 6 hours, cooled to room temperature, suction filtered, and washed several times with deionized water. Finally, freeze-dry the product to obtain MoS 2 QDs / G composite particles.

[0060] ...

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Abstract

The invention discloses a molybdenum disulfide quantum dot / graphene / polymer-based super-wear-resistant self-lubricating composite material and a preparation method and application thereof, and belongsto the technical field of advanced composite material science. The preparation method comprises the following steps: firstly, preparing molybdenum disulfide quantum dots by combining ultrasound and solvothermal; loading the molybdenum disulfide quantum dots on the surface of graphene through a physical adsorption effect to prepare molybdenum disulfide quantum dot / graphene composite particles, then introducing the molybdenum sulfide quantum dot / graphene composite particles into a polymer material, and preparing the polymer-based composite material with super wear resistance and excellent self-lubricating performance. The preparation method is simple in operation process and convenient for large-scale production, and has universality; compared with a pure polymer material, the molybdenum disulfide quantum dot / graphene / polymer-based super-wear-resistant self-lubricating composite material prepared by the method has the advantages that the friction coefficient can be reduced by 51-63%, the volume wear rate can be reduced by 70-95%, the molybdenum disulfide quantum dot / graphene / polymer-based super-wear-resistant self-lubricating composite material can be applied to super-wear-resistantmechanical parts, and the application of the polymer material is widened.

Description

technical field [0001] The invention belongs to the field of science and technology of advanced composite materials, and relates to a molybdenum disulfide quantum dot / graphene / polymer-based super wear-resistant self-lubricating composite material and its preparation method and application. Background technique [0002] Polymer materials have the advantages of high specific strength, light weight, corrosion resistance, and easy processing. They are a class of materials widely used in aerospace, automotive, and chemical industries. However, polymer materials have the disadvantages of high friction coefficient, easy wear, and unstable friction coefficient during application, which shortens their service life in actual application and greatly limits their application in friction materials. At present, a common solution to this problem of polymers is to introduce lubricating particles into polymer materials to improve their tribological properties. [0003] Graphene (G) has the ...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08L63/02C08L27/18C08K9/12C08K3/30
CPCC08K9/12C08K3/30C08K2003/3009C08K2201/005C08L79/085C08L63/00C08L27/18
Inventor 刘超林阳鲍艳殷青李茜
Owner SHAANXI UNIV OF SCI & TECH
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