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Method for preparing composite polytetrafluoroethene conductive material

A technology of polytetrafluoroethylene and conductive materials, which is applied in the production field of composite polytetrafluoroethylene conductive materials to achieve excellent conductivity, promote uniform dispersion, and avoid aggregation

Active Publication Date: 2016-09-07
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Graphene has many unique physical and chemical properties. Graphene is a substance without energy gaps, showing metallicity; in single-layer graphene, each carbon atom has an unbonded electron, so it has very good conductivity ; Holes and electrons in graphene are separated from each other, leading to the generation of new electron conduction phenomena, such as irregular quantum Hall effect; graphene also has good mechanical properties, optical properties, thermal properties, but graphene is in Agglomeration is prone to occur in practical applications, which will affect its performance

Method used

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  • Method for preparing composite polytetrafluoroethene conductive material
  • Method for preparing composite polytetrafluoroethene conductive material
  • Method for preparing composite polytetrafluoroethene conductive material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Mix polytetrafluoroethylene with a particle size of 25 μm and modified graphene microflakes with a thickness of 15 to 20 nm in a mass ratio of 90:10, and prepare a uniform mixture of graphene microflakes and polytetrafluoroethylene by mechanical blending material.

[0024] The prepared powder was cold-pressed under a pressure of 35MPa and kept under pressure for 2 minutes. The obtained flake sample was removed from the mold, placed in a muffle furnace, raised to 370-380°C at a heating rate of 200°C / hour, kept for 2 hours, and then the sintered product was cooled to room temperature with the furnace to obtain a composite polyquaternary Vinyl fluoride conductive material.

[0025] The composite polytetrafluoroethylene conductive material is tested according to GB / T 1040-92, its elongation at break: 233.02%, tensile strength: 16.02MPa. GB / T 3960-1983 detection, its wear amount: 18mg, friction coefficient: 0.29. At room temperature, bulk conductivity: 0.1 S / cm.

Embodiment 2

[0027] Mix polytetrafluoroethylene with a particle size of 25 μm and modified graphene microflakes with a thickness of 15 to 20 nm at a mass ratio of 87:13, and prepare a uniform mixture of graphene microflakes and polytetrafluoroethylene by mechanical blending.

[0028] The prepared powder was cold-pressed under a pressure of 35MPa and kept under pressure for 2 minutes. The obtained flake sample was removed from the mold, placed in a muffle furnace, raised to 370-380°C at a heating rate of 200°C / hour, kept for 2 hours, and then the sintered product was cooled to room temperature with the furnace to obtain a composite polyquaternary Vinyl fluoride conductive material.

[0029] The composite polytetrafluoroethylene conductive material is tested according to GB / T 1040-92, its elongation at break: 119.41%, tensile strength: 15.74MPa. GB / T 3960-1983 detection, its wear amount: 9.8mg, friction coefficient: 0.20. At room temperature, volume conductivity: 0.54S / cm.

Embodiment 3

[0031] Mix polytetrafluoroethylene with a particle size of 25 μm and modified graphene microflakes with a thickness of 15-20 nm at a mass ratio of 85:15, and prepare a homogeneous mixture of polytetrafluoroethylene composite materials by mechanical blending.

[0032] The prepared powder was cold-pressed under a pressure of 40 MPa, and kept under pressure for 2 minutes. The obtained flake sample was removed from the mold, placed in a muffle furnace, raised to 370-380°C at a heating rate of 200°C / hour, kept for 2 hours, and then the sintered product was cooled to room temperature with the furnace to obtain a composite polyquaternary Vinyl fluoride conductive material.

[0033] The composite polytetrafluoroethylene conductive material is tested according to GB / T 1040-92, its elongation at break: 7.40%, tensile strength: 15.21MPa. GB / T 3960-1983 detection, its wear amount: 18.6mg, friction coefficient: 0.23. At room temperature, bulk conductivity: 0.57 S / cm.

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Abstract

A method for preparing a composite polytetrafluoroethene (PTFE) conductive material relates to the technical field of the manufacture of the composite PTFE conductive material. The crystallization behavior of PTFE is improved through the filling of graphene nanoplatelets; the interfacial adhesion between the graphene nanoplatelets and PTFE is regulated to endow PTFE with excellent wear-resisting property and conductivity, while maintaining certain mechanical properties of PTFE; the composite PTFE conductive material, which is prepared through the cold pressed sintering method, has comprehensive mechanical properties, wear-resisting property and conductivity.

Description

technical field [0001] The invention relates to the technical field of production of composite polytetrafluoroethylene conductive materials. Background technique [0002] Polytetrafluoroethylene (PTFE) is widely used in chemistry, electronics, bioengineering, food industry and other related fields because of its excellent physical and chemical properties. However, PTFE also has insulating properties that limit its application in many occasions that require electrical conductivity. Therefore, at present, many studies on improving the conductivity of PTFE at home and abroad focus on the research on the filling and conductivity of PTFE. By changing the conductive behavior of PTFE and adjusting the interface bonding performance between the filler and the matrix by filling the conductive filler, a high-performance polytetrafluoroethylene conductive composite material can be obtained. [0003] Currently commonly used conductive fillers for PTFE are mainly carbon black, carbon na...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K9/02C08K3/04
CPCC08K3/04C08K9/02C08K2201/011C08L2201/04C08L27/18
Inventor 朱爱萍江波彭勃李艳香
Owner YANGZHOU UNIV
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