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Polytetrafluoroethylene nanoscale powder material and preparation method thereof

A polytetrafluoroethylene, nano-scale technology, applied in the field of polytetrafluoroethylene nano-scale powder and its preparation, can solve the problems of inability to crush fine particles, poor resistance to extreme pressure, etc., and achieve improved shear efficiency and uniform particle size The effect of increasing the degree, extreme pressure resistance, and improving performance indicators

Inactive Publication Date: 2010-02-03
SHANGHAI LINGMU NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, its ability to withstand extreme pressure is relatively poor.
Due to the above reasons, PTFE cannot be crushed into nano-scale fine particles by existing conventional mechanical crushing such as ball milling, high-speed shearing, and high-pressure airflow crushing.

Method used

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  • Polytetrafluoroethylene nanoscale powder material and preparation method thereof
  • Polytetrafluoroethylene nanoscale powder material and preparation method thereof
  • Polytetrafluoroethylene nanoscale powder material and preparation method thereof

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preparation example Construction

[0025] The present invention is a polytetrafluoroethylene nanoscale powder, which is different from the prior art in that the polytetrafluoroethylene nanoscale powder has a particle diameter of 20nm-50nm and a gray color. A method for preparing polytetrafluoroethylene nano-scale powder, characterized in that, the preparation method of polytetrafluoroethylene nano-scale powder comprises the following steps: a, using polytetrafluoroethylene with a particle diameter between 50 μm and 500 μm Vinyl fluoride ultrafine powder, the polytetrafluoroethylene ultrafine powder with a particle diameter between 50 μm and 500 μm is used in the implementation, which is a polytetrafluoroethylene ultrafine powder produced by a dispersion method. Ultra-fine powder is the prior art, and it is not described in detail here; b, under the condition of vacuuming, carry out sealed packaging, the condition of vacuuming is 100 Pa-150 Pa; c, put the packaged raw material into radiation Cobalt-60 gamma ray ...

Embodiment 1

[0030] The polytetrafluoroethylene powder produced by the dispersion method is sealed and packaged under the condition of vacuuming. Radiation cobalt-60 gamma ray radiation pyrolysis, the irradiation dose is 420kGy; pump out the gas products of radiation pyrolysis in the package, open the package, and you will get white polytetrafluoroethylene ultrafine powder with particle diameter between 200nm and 300nm. The polytetrafluoroethylene ultrafine powder with a white particle diameter of 200nm-300nm after ray radiation cracking is hydrated with industrial ethanol and mixed with pure water to form a fluid slurry, and their weight percentage is 50% of the polytetrafluoroethylene powder , industrial ethanol 30%, the ethanol content of industrial ethanol is 99%, pure water 20%; the fluid slurry is added to the ultra-high pressure homogenizer for homogenization, the pressure of the ultra-high pressure homogenizer is 100Mpa-120Mpa, the homogenization time 6 minutes; add the homogenized...

Embodiment 2

[0032] The polytetrafluoroethylene powder produced by the dispersion method is under vacuum conditions. Carry out sealed packaging; put the packaged polytetrafluoroethylene ultrafine powder into nuclear radiation equipment and undergo nuclear radiation cobalt-60γ ray radiation cracking, the irradiation dose is 480kGy; pump out the gas products of radiation cracking in the package, open the package, A white polytetrafluoroethylene ultrafine powder with a particle diameter between 200nm and 300nm will be obtained. The polytetrafluoroethylene ultrafine powder with a white particle diameter of 200nm-300nm after ray radiation cracking is mixed with industrial ethanol and purified water to form a fluid slurry, and their weight percentage is 58% of the polytetrafluoroethylene powder , the ethanol concentration of industrial ethanol 25% industrial ethanol is 99%, pure water 17%; The fluid slurry is added in ultra-high pressure homogenizer for homogenization, the pressure of ultra-high...

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Abstract

The invention relates to a polytetrafluoroethylene nanoscale powder material which is characterized in that the particle diameter of the polytetrafluoroethylene nanoscale powder material is 20nm-50nm,and the color of the polytetrafluoroethylene nanoscale powder material is gray. In the invention, when the polytetrafluoroethylene material is pulverized to 20nm-50nm, compared with the original polytetrafluoroethylene material, the color and two performance indexes are obviously changed: (1) the lubricating performance is changed, the friction coefficient is obviously reduced, and the diameter of a worn spot is reduced to 0.33mm from 0.58mm; and (2) the capability of resisting the extreme pressure is increased. In a lubricating oil system, the test data of the increase of the capability of resisting the extreme pressure is improved in multiples, wherein the test data is improved to 6080N from 2500N.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a polytetrafluoroethylene nanoscale powder and a preparation method thereof. Background technique [0002] PTFE has a typical polymer structure of alkane compounds, because the fluorine atoms with larger diameters tightly surround the carbon atoms. The CF2 units in the PTFE molecule are arranged in a zigzag shape. The repulsion between the unbonded fluorine atoms in the polytetrafluoroethylene molecule is relatively large, so polytetrafluoroethylene has a helical molecular structure, and at the same time (polytetrafluoroethylene=CF 2 =) The carbon-fluorine bond is the single bond with the highest bond energy. This structure makes polytetrafluoroethylene far superior to other polymers in terms of thermal stability, chemical inertness, high melting point and high working temperature. It is known as the king of plastics. Polytetrafluoroethylene material itself ha...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08J3/28C08L27/18
Inventor 赵德耀
Owner SHANGHAI LINGMU NEW MATERIAL TECH CO LTD
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