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Method for preparing polytetrafluoroethylene micropowder by carrying out swelling treatment on polytetrafluoroethylene through adopting supercritical carbon dioxide

A technology of polytetrafluoroethylene micropowder and polytetrafluoroethylene, which is applied in the production of bulk chemicals, etc., can solve the problem of large average particle size of polytetrafluoroethylene micropowder, poor performance of polytetrafluoroethylene micropowder, uneven particle size dispersion, etc. problem, to achieve good flow and transfer performance, no electrostatic effect, no self-agglomeration effect

Active Publication Date: 2014-07-30
SUZHOU NORSHINE PERFORMANCE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of these two methods is that the average particle size of the prepared PTFE powder is relatively large, and the particle size dispersion is uneven, resulting in poor performance of the PTFE powder, which is not conducive to uniform mixing with other materials.
Among them, in the second method, after the degradation of PTFE, the crushing rate is low, the crushing time is long, and the energy consumption is large.

Method used

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  • Method for preparing polytetrafluoroethylene micropowder by carrying out swelling treatment on polytetrafluoroethylene through adopting supercritical carbon dioxide
  • Method for preparing polytetrafluoroethylene micropowder by carrying out swelling treatment on polytetrafluoroethylene through adopting supercritical carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Put the polytetrafluoroethylene raw material in a high-pressure stainless steel container.

[0024] (2) Use a high-pressure pump to press carbon dioxide into the high-pressure stainless steel container. The high-pressure stainless steel container maintains a pressure of 20MPa, a temperature of 40°C, and a swelling time of 2 hours. During this period, the carbon dioxide penetrates into the polytetrafluoroethylene, and the carbon dioxide is saturated in the polytetrafluoroethylene. , PTFE swelling.

[0025] (3) Pressure relief, the gas pressure in the high-pressure stainless steel container is reduced to normal pressure, and the carbon dioxide in the polytetrafluoroethylene is released to form expanded polytetrafluoroethylene with a porous structure.

[0026] (4) Using the GJ~2 type electron accelerator, the polytetrafluoroethylene with expanded and porous structure is treated with radiation modification technology, and the radiation dose is controlled at 20 Mrad.

...

Embodiment 2

[0035] (1) Put the polytetrafluoroethylene raw material in a high-pressure stainless steel container.

[0036] (2) Use a high-pressure pump to press carbon dioxide into the high-pressure stainless steel container. The high-pressure stainless steel container maintains a pressure of 30MPa, a temperature of 40°C, and a swelling time of 2 hours. During this period, carbon dioxide penetrates into the polytetrafluoroethylene, and the carbon dioxide is saturated in the polytetrafluoroethylene. , PTFE swelling.

[0037] (3) Pressure relief, the gas pressure in the high-pressure stainless steel container is reduced to normal pressure, and the carbon dioxide in the polytetrafluoroethylene is released to form expanded polytetrafluoroethylene with a porous structure.

[0038] (4) Using the GJ~2 type electron accelerator, the polytetrafluoroethylene with expanded and porous structure is treated with radiation modification technology, and the radiation dose is controlled at 20Mrad.

[0039...

Embodiment 3

[0047] (1) Put the polytetrafluoroethylene raw material in a high-pressure stainless steel container.

[0048](2) Use a high-pressure pump to press carbon dioxide into the high-pressure stainless steel container. The high-pressure stainless steel container maintains a pressure of 20MPa, a temperature of 40°C, and a swelling time of 2 hours. During this period, the carbon dioxide penetrates into the polytetrafluoroethylene, and the carbon dioxide is saturated in the polytetrafluoroethylene. , PTFE swelling.

[0049] (3) Pressure relief, the gas pressure in the high-pressure stainless steel container is reduced to normal pressure, and the carbon dioxide in the polytetrafluoroethylene is released to form expanded polytetrafluoroethylene with a porous structure.

[0050] (4) Using the GJ~2 type electron accelerator, the polytetrafluoroethylene with expanded and porous structure is treated with radiation modification technology, and the radiation dose is controlled at 100Mrad.

[...

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Abstract

The invention discloses a method for preparing polytetrafluoroethylene micropowder by carrying out swelling treatment on polytetrafluoroethylene through adopting supercritical carbon dioxide. After being subjected to swelling treatment by adopting supercritical carbon dioxide, the polytetrafluoroethylene is subjected to pressure relief and carbon dioxide release, and then is ground and smashed into polytetrafluoroethylene micropowder. The method comprises the following steps: I, carrying out swelling treatment on polytetrafluoroethylene through adopting supercritical carbon dioxide; II, reducing the pressure of the polytetrafluoroethylene obtained in the step I to be normal pressure, and releasing carbon dioxide; III, treating the polytetrafluoroethylene obtained in the step II, by adopting radiation modification technology; IV, grinding and smashing the polytetrafluoroethylene obtained in the step III. The method is very unique and novel, and simple in preparation technology, the grinding and smashing efficiency of the polytetrafluoroethylene is greatly improved, the average particle size of the polytetrafluoroethylene micropowder is greatly reduced, and the polytetrafluoroethylene micropwoder has good dispersion capability, and is good in dispersion performance in a matrix as a blending modification additive, and obvious in modification effect.

Description

technical field [0001] The invention relates to a method for preparing polytetrafluoroethylene micropowder by adopting supercritical carbon dioxide swelling to treat polytetrafluoroethylene. Background technique [0002] Polytetrafluoroethylene micropowder is a fluid white powder, which is widely used in the blending modification of synthetic materials, which can significantly improve the lubricity, wear resistance, non-stick and flame retardancy of the substrate, and can also be used as a lubricating oil , high-grade coatings and inks and other additives. At present, with the rapid development of daily chemicals, PTFE micropowder is widely used in various fields due to its excellent performance. [0003] In the prior art, there are mainly two methods for preparing polytetrafluoroethylene micropowder: the first method is to directly polymerize with tetrafluoroethylene suspension method, and after a certain period of time, the polymerization reaction is terminated and then d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08J9/36C08L27/18
CPCY02P20/54
Inventor 黄炯炯
Owner SUZHOU NORSHINE PERFORMANCE MATERIAL
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