Self-repairing self-lubricating material and preparation method thereof

A self-healing, solid self-lubricating technology, used in the field of self-healing self-lubricating materials, can solve the problems of irreversibility, poor interface adhesion, limited modification effect, etc., to achieve self-healing and improve service life.

Active Publication Date: 2018-08-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the non-stickiness of PTFE itself, the interfacial bonding between the filler or reinforcement and the matrix in the composite is poor
Although many studies have tried to improve the interfacial bonding of composite materials by using various methods, these studies only focus on the surface treatment of fillers or reinforcements, and the modification effect is limited.
The second is the problem of wear and tear
Although the introduction of fillers or reinforcements combined with PTFE has improved the wear resistance to varying degrees, but once the wear occurs, it is irreversible. How to improve the service life of the material needs further research and exploration

Method used

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  • Self-repairing self-lubricating material and preparation method thereof
  • Self-repairing self-lubricating material and preparation method thereof
  • Self-repairing self-lubricating material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] (1) Preparation of PTFE core-shell particles

[0052] Add 70 ml of PTFE dispersion into a four-necked flask containing 500 ml of deionized water under stirring at 300 rpm, add 70 ml of methyl methacrylate (0.654 mol) after heating to 75 °C. After being stable for 30 min, potassium persulfate aqueous solution (10 mL, 0.74 mmol) was added, reacted under nitrogen atmosphere for 20 h, and the product was collected by repeated centrifugation, and dried at 85°C for 5 h to obtain polymethyl methacrylate-coated PTFE core-shell nanoparticles. SEM was used to characterize the samples before and after PTFE core-shell modification, the results are as follows figure 1 shown. Depend on figure 1 It can be seen that the pure PTFE has an ellipsoidal structure before modification, and a spherical structure after modification. In order to further analyze the structure of the modified product, we used transmission electron microscopy to characterize the modified sample, the results are ...

Embodiment 2

[0060] (1) Preparation of PTFE core-shell particles

[0061] Add 70 ml of PTFE dispersion into a four-necked flask containing 400 ml of deionized water under stirring at 400 rpm, add 35 ml of methyl methacrylate after heating to 70 °C. After being stable for 30 minutes, aqueous potassium persulfate solution (10 mL, 0.37 mmol) was added, reacted for 24 hours under nitrogen atmosphere, and the product was collected by repeated centrifugation, and dried at 80°C for 8 hours to obtain polymethyl methacrylate-coated PTFE core-shell particles.

[0062] (2) Preparation of microcapsules

[0063] 10 ml of graphene oxide dispersion was mixed with 0.8 g of linseed oil, mixed under high shear at 900 rpm for 15 minutes to prepare Pickering emulsion, and dried at room temperature for 10 h to obtain microcapsules.

[0064] (3) Preparation of self-healing self-lubricating composite film

[0065] A certain amount of PTFE core-shell particles and microcapsules are mixed in a solvent, and a com...

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Abstract

The invention provides a self-repairing self-lubricating material and a preparation method thereof. The self-repairing self-lubricating material comprises modified PTFE and a microcapsule containing arepairing agent, wherein the modified PTFE is a particle with a core/shell structure, and uses PTFE particles are a core and a wear-resistant polymer or a two-dimensional material as a shell; the microcapsule is composed of a capsule core and a capsule wall, the capsule wall is a high-molecular polymer such as urea-formaldehyde resin and polyvinylpyrrolidone or a two-dimensional material such asgraphene, and the capsule core is a repairing agent such as dibutyl phthalate, glycidyl methacrylate and linseed oil. The material provided by the invention improves the problems that compatibility ofPTFE with heterogeneous materials is poor, mechanical strength is low and the PTFE is extremely easy to wear; and in addition, introduction of the microcapsule enables the PTFE lubricating material to have self-repairing regulating and controlling functions, friction-reducing anti-wear properties of the material are enhanced, and the service life of the lubricating material is improved.

Description

technical field [0001] The invention belongs to the technical field of self-lubricating composite materials, and in particular relates to a self-repairing self-lubricating material, a preparation method and an application. Background technique [0002] PTFE is an important engineering plastic. Since it was first synthesized by American scientists in 1938, the application of PTFE has been greatly developed. Friction and wear are ubiquitous in mechanical equipment, and friction and wear have caused huge energy waste and economic loss. PTFE has an extremely low friction coefficient, excellent chemical corrosion resistance and high temperature stability, and is often used as a solid self-lubricating material. PTFE is polymerized from tetrafluoroethylene, and the C-C main bond is completely wrapped by F atoms to form a streamlined cylindrical structure. The attraction between the rod-shaped molecules is extremely small, and the molecules are easy to slide, thus forming a transfe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/00C08L91/00C08K9/10C08K5/12C08F259/08C08F220/14
CPCC08F259/08C08K5/12C08K9/10C08L51/003C08L2205/18C08L2207/53C08F220/14C08L91/005
Inventor 张琳解国新温诗铸雒建斌
Owner TSINGHUA UNIV
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