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A kind of graphene-nanometer polytetrafluoroethylene composite filler and its preparation method and application

A polytetrafluoroethylene and composite filler technology, applied in the field of friction materials, can solve the problems of lack of layered structure, lack of lubricating effect, lack of interlayer slip, etc., achieving a wide range of applications and a reliable and easy preparation method. The effect of improving the tribological performance

Inactive Publication Date: 2016-05-11
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because graphene does not have a layered structure similar to graphite, it cannot slip between layers, so it cannot play a good lubrication effect.

Method used

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  • A kind of graphene-nanometer polytetrafluoroethylene composite filler and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0029] At room temperature, 0.1 g of graphene oxide was dispersed in 300 g of N,N-dimethylformamide by ultrasound. After ultrasonic dispersion for 1 hour, 5 g of diphenyl ether diamine was added, and the reaction was stirred at 80° C. for 12 hours. The reacted dispersion liquid is vacuum filtered, washed and dried to obtain modified graphene. 1 gram of nano-polytetrafluoroethylene reacts with acrylic acid under irradiation to obtain modified nano-polytetrafluoroethylene. Take 0.09 g of modified graphene and 0.9 g of modified nano-polytetrafluoroethylene and ultrasonically disperse them in 300 g of N,N-dimethylformamide, add 1.12 g of 1-(3-dimethylaminopropyl)-3- Ethylcarbodiimide hydrochloride, 1.58 grams of 1-hydroxybenzotriazole and 10 milliliters of triethylamine were stirred and reacted at 40°C for 24 hours, filtered and washed, and vacuum-dried overnight at 70°C to obtain graphene-nanopolymer Tetrafluoroethylene composite filler.

Embodiment 2

[0031] Disperse 0.2 g of partially reduced graphene oxide in 500 g of N,N-dimethylformamide by ultrasonic at room temperature, after ultrasonic dispersion for 2 hours, add 10 g of diphenyl ether diamine, and stir for 18 hours at 80°C . The reacted dispersion liquid is vacuum filtered, washed and dried to obtain modified graphene. 2 grams of nano-polytetrafluoroethylene reacted with acrylic acid under irradiation to obtain modified nano-polytetrafluoroethylene. Take 0.09 g of modified graphene and 1.8 g of modified nano-polytetrafluoroethylene and ultrasonically disperse them in 300 g of N,N-dimethylformamide, add 1.56 g of 1-(3-dimethylaminopropyl)-3- Ethylcarbodiimide hydrochloride, 2.20 grams of 1-hydroxybenzotriazole and 15 milliliters of triethylamine were stirred and reacted at 40°C for 24 hours, filtered and washed, and vacuum-dried overnight at 70°C to obtain graphene-nanopolymer Tetrafluoroethylene composite filler.

Embodiment 3

[0033]0.1 g of partially reduced graphene oxide was dispersed in 300 g of N,N-dimethylformamide by ultrasonic at room temperature. After ultrasonic dispersion for 1 hour, 5 g of p-phenylenediamine was added, and the reaction was stirred at 70°C for 12 hours. The reacted dispersion liquid is vacuum filtered, washed and dried to obtain modified graphene. 1 gram of nano-polytetrafluoroethylene reacts with acrylic acid under irradiation to obtain modified nano-polytetrafluoroethylene. Take 0.09 g of modified graphene and 0.9 g of modified nano-polytetrafluoroethylene and ultrasonically disperse them in 300 g of N,N-dimethylformamide, add 1.12 g of 1-(3-dimethylaminopropyl)-3- Ethylcarbodiimide hydrochloride, 1.58 grams of 1-hydroxybenzotriazole and 10 milliliters of triethylamine were stirred and reacted at 30°C for 24 hours, filtered and washed, and vacuum-dried overnight at 60°C to obtain graphene-nanopolymer Tetrafluoroethylene composite filler.

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Abstract

The invention belongs to the technical field of friction material, and in particular relates to a graphene-nano polytetrafluoroethylene composite filler with a function of reducing friction, as well as a preparation method and the application of the composite filler. The composite filler comprises the following main components in parts by weight: 1 part of modified graphene and 1-20 parts of modified nano polytetrafluoroethylene; the preparation method of the composite filler comprises the following steps: separately reacting graphene and nano polytetrafluoroethylene with amination reagent and carboxylation reagent to obtain the modified graphene and the modified nano polytetrafluoroethylene; carrying condensation reaction so that the modified graphene and the modified nano polytetrafluoroethylene are connected with each other by a covalent bond to obtain the graphene-nano polytetrafluoroethylene composite filler. The function of friction reduction of the graphene and the function of lubrication of the nano polytetrafluoroethylene are utilized at the same time; after the composite filler is added to a polymer material, the friction coefficient and the wear rate of the material can be reduced, and the mechanical property of the material can be improved.

Description

technical field [0001] The invention belongs to the technical field of friction materials, and in particular relates to a graphene-nano polytetrafluoroethylene composite filler with the function of reducing friction and reducing friction, as well as its preparation method and application. Background technique [0002] Solid lubricant is a key research object in the field of material tribology, and it is of great significance for saving energy, reducing loss, cleaning the environment, and protecting machinery. At present, the application of solid lubricants in polymer materials is mainly limited to some traditional fillers, such as graphite, polytetrafluoroethylene, molybdenum disulfide, etc. These traditional fillers can improve some tribological properties of polymer materials to a certain extent, but often cause a significant decrease in mechanical properties. [0003] Compared with traditional fillers, graphene as a sp 2 The two-dimensional thin-layer material composed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08K9/04C08K3/04
Inventor 李同生辛元石黄挺苏超薛峰
Owner FUDAN UNIV
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