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Preparation method of nitrogen-doped graphene/polytetrafluoroethylene (PTFE ) composite material

A technology of nitrogen-doped graphene and polytetrafluoroethylene, which is applied in the field of preparation of nitrogen-doped graphene/polytetrafluoroethylene composite materials, can solve the problems of easy deformation and poor wear resistance, and achieve good wear resistance , good friction and wear performance

Inactive Publication Date: 2017-08-15
GREATOO INTELLIGENT EQUIP INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor wear resistance of the material itself and its easy deformation under high temperature and continuous load, some additives are usually selected for performance modification in actual industrial applications to achieve excellent comprehensive performance.

Method used

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  • Preparation method of nitrogen-doped graphene/polytetrafluoroethylene (PTFE ) composite material
  • Preparation method of nitrogen-doped graphene/polytetrafluoroethylene (PTFE ) composite material
  • Preparation method of nitrogen-doped graphene/polytetrafluoroethylene (PTFE ) composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0029]Example 1: Weigh 0.5 g of graphene sheet prepared by the re-expansion method, keep it in concentrated nitric acid at 120°C for 5 hours, then wash the solution to neutrality, and ultrasonically disperse the treated graphene into the aqueous solution again 1g of polyvinylpyrrolidone (PVP) was added, the solution was magnetically stirred, and the uniformly mixed solution was kept at a constant temperature of 100°C in the reaction kettle. After 4 hours, the sample was centrifuged and dried to obtain nitrogen-doped Graphene precursor material; will obtain the PTFE powder of nitrogen-doped graphene precursor material 0.5g and 100g and other auxiliary agents, auxiliary agent is the copper powder 5g of carbon fiber 1.5g, 100nm, 3mm glass fiber 1g, chlorinated 0.5g of copper, 0.2g of silane coupling agent (KH-550), 1g of nano-zinc oxide powder, and 0.5g of silicon carbide, and get a uniformly mixed powder through a mechanical mixer; then transfer the powder into a mold under a pre...

Embodiment 2

[0030] Example 2: Weigh 0.5g of graphene oxide prepared by the modified Hummer method, disperse it in an aqueous solution, then add 2g of glycine and heat it up to 140°C in the reactor, react for 4 hours and then centrifuge and dry to obtain Nitrogen-doped reduced graphene; then take nitrogen-doped reduced graphene 0.25g and PTFE powder of 100g and other additives, additives are 5 μm carbon fiber 1.4g, 1 μm copper powder 5g, 7mm glass fiber 1g, chlorine 0.6g of cuprous chloride, 0.25g of silane coupling agent (KH-560), 1.2g of nano-zinc oxide powder, and 0.8g of silicon carbide were mixed uniformly through a mechanical stirrer to obtain a mixed powder. Then the powder is transferred into a mold and slowly pressed under a pressure of 12Mpa, and then kept under constant pressure for 8 minutes to obtain a preform. Then put the preform into a temperature-controllable furnace from room temperature to 355°C and control the temperature rise rate to ~10°C / min. After reaching 355°C, ke...

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Abstract

The invention relates to a preparation method of a nitrogen-doped graphene / polytetrafluoroethylene (PTFE) composite material. The preparation method comprises the following steps: treating a graphene sheet with strong acid to prepare a nitrogen-doped graphene precursor; or carrying out amino acid chemical reaction on graphene oxide to prepare nitrogen-doped graphene; uniformly mixing one of the prepared nitrogen-doped graphene precursor or the nitrogen-doped graphene with PTFE powder and an auxiliary agent, wherein the weight ratio of the materials is that the nitrogen-doped graphene precursor or the nitrogen-doped graphene to the PTFE to the auxiliary agent is 1 to (100 to 200) to (10 to 25) and the auxiliary agent is prepared from the components according to a weight ratio: carbon fiber to copper powder to glass fiber to cuprous chloride to a silane coupling agent to nano zinc oxide powder to silicon carbide of (5 to 12) to (10 to 40) to (3 to 7) to (2 to 4) to 1 to (3 to 9) to (1 to 5); carrying out die pressing and carrying out temperature control sintering to obtain the nitrogen-doped graphene / PTFE composite material. The nitrogen-doped graphene / PTFE composite material has the advantages of high temperature resistance and better friction and abrasion performances.

Description

technical field [0001] The invention relates to a preparation method of a nitrogen-doped graphene / polytetrafluoroethylene composite material. Background technique [0002] PTFE is the most important in industrial applications because of its excellent chemical stability, corrosion resistance, sealing, high lubrication, non-stickiness, electrical insulation, good aging resistance and extremely low friction coefficient. polymer materials. However, due to the poor wear resistance of the material itself and its easy deformation under high temperature and continuous load, some additives are usually selected for performance modification in practical industrial applications to achieve excellent comprehensive performance. [0003] Graphene is one of the most popular research materials in recent years, which has SP 2 Hybrid honeycomb carbon structure, the thickness of single-layer graphene is 0.334nm, which is the thinnest material known so far. Graphene has a super large specific ...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08L39/06C08K13/06C08K9/04C08K9/02C08K3/04C08K7/06C08K7/14
CPCC08K3/22C08K7/06C08K7/14C08K9/04C08K13/06C08L27/18C08K2003/2248C08K2003/2296C08K2201/011
Inventor 张世钦吕树申张锦芳符远翔李晓彬林瑞波陈晓芬莫冬传
Owner GREATOO INTELLIGENT EQUIP INC
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