Expanded polytetrafluoroethylene material and preparation method thereof

A technology of polytetrafluoroethylene and expanded body, which is applied in the field of materials, can solve the problems of reducing the surface resistance value of polytetrafluoroethylene film, the antistatic effect of antistatic film is not ideal, and the absorption of antistatic liquid is limited, so as to achieve antistatic Long-acting and long-lasting electrostatic effect, good anti-static effect, and stable properties

Inactive Publication Date: 2021-10-01
ZHEJIANG DEQING CONCEPTFE PLASTIC PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of this antistatic film is that the expanded polytetrafluoroethylene film has limited absorption of antistatic liquid, resulting in the surface resistance of the polytetrafluoroethylene film (before drying) that absorbs the antistatic liquid. value is only 10 4 ~10 8 Ohms, and drying will further reduce the surface resistance of the PTFE film, making the antistatic effect of the final antistatic film not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of expanded polytetrafluoroethylene pipe material of present embodiment, its preparation method comprises the following steps:

[0037] (1) According to the preset mass percentage, carbon black is mixed with polytetrafluoroethylene dispersion material, pre-sintered after molding, and the pre-sintered material is pulverized to obtain antistatic filler;

[0038] Specifically, mix polytetrafluoroethylene and carbon black (with a particle size between 100-200nm) at a mass ratio of 60:40, pre-sinter at 340°C for 12 hours after molding, and then crush the pre-sintered material to 10-25 μm Between, obtain antistatic filler;

[0039] (2) Mix polytetrafluoroethylene, antistatic filler and liquid lubricant according to preset weight parts, and ripen to obtain pasty material;

[0040] Specifically, the polytetrafluoroethylene dispersion material, antistatic filler and aviation kerosene were mixed and stirred evenly according to the mass ratio of 100:20:15 to obtain a mixtu...

Embodiment 2

[0046] A kind of expanded polytetrafluoroethylene pipe material of present embodiment, its preparation method comprises the following steps:

[0047] (1) According to the preset mass percentage, carbon black is mixed with polytetrafluoroethylene dispersion material, pre-sintered after molding, and the pre-sintered material is pulverized to obtain antistatic filler;

[0048]Specifically, polytetrafluoroethylene and carbon black (particle size between 100-200nm) are mixed at a mass ratio of 70:30, pre-sintered at 330°C for 24 hours after molding, and then the pre-sintered material is crushed to 10-25μm Between, obtain antistatic filler;

[0049] (2) Mix polytetrafluoroethylene, antistatic filler and liquid lubricant according to preset weight parts, and ripen to obtain pasty material;

[0050] Specifically, the polytetrafluoroethylene dispersion material, antistatic filler and aviation kerosene were mixed and stirred evenly according to the mass ratio of 100:30:20 to obtain a m...

Embodiment 3

[0056] A kind of expanded polytetrafluoroethylene pipe material of present embodiment, its preparation method comprises the following steps:

[0057] (1) According to the preset mass percentage, carbon black is mixed with polytetrafluoroethylene dispersion material, pre-sintered after molding, and the pre-sintered material is pulverized to obtain antistatic filler;

[0058] Specifically, polytetrafluoroethylene and carbon black (particle size between 100-200nm) are mixed at a mass ratio of 80:20, pre-sintered at 350°C for 3 hours after molding, and then the pre-sintered material is crushed to 10-25 μm Between, obtain antistatic filler;

[0059] (2) Mix polytetrafluoroethylene, antistatic filler and liquid lubricant according to preset weight parts, and ripen to obtain pasty material;

[0060] Specifically, the polytetrafluoroethylene dispersion material, antistatic filler and aviation kerosene are mixed and stirred evenly according to the mass ratio of 100:35:25 to obtain a m...

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Abstract

12The invention discloses an expanded polytetrafluoroethylene material and a preparation method thereof. The expanded polytetrafluoroethylene material comprises the following raw materials by weight: 100 parts of polytetrafluoroethylene, 20-40 parts of an antistatic filler and 15-25 parts of a liquid lubricant. The antistatic filler comprises the following raw materials in percentage by mass: 60-95% of polytetrafluoroethylene and 5-40% of carbon black. According to the invention, the anti-static filler is prepared by mixing, sintering and crushing PTFE and carbon black, and in the sintering process, the carbon black is uniformly dispersed in PTFE melt, so that carbon black particles are wrapped in powdery particles of the anti-static filler. Compared with the mode that carbon black is directly added into PTFE, the method has the advantages that the dispersity of the carbon black in the PTFE is better by firstly preparing the anti-static filler and then mixing the anti-static filler with the PTFE, the surface resistance fluctuation ratio of the ePTFE material is smaller (the surface resistance can reach 10<12> ohms), the dielectric loss and the dielectric constant are lower, and the anti-static effect is long-acting and lasting.

Description

technical field [0001] The invention belongs to the field of material technology, in particular to an expanded polytetrafluoroethylene material and a preparation method thereof. Background technique [0002] Expanded polytetrafluoroethylene (ePTFE) is obtained by modifying polytetrafluoroethylene (PTFE). Expanded polytetrafluoroethylene not only retains the excellent properties of polytetrafluoroethylene, but also has excellent creep resistance, Wear resistance, thus greatly broadening its range of applications. [0003] The common preparation methods of expanded polytetrafluoroethylene include mechanical stretching method, spinning method and pore-forming agent method. Press the pasty material into the preform under low pressure, push the preform into a preform and calender it into a sheet, remove the extrusion aid by heating, and then perform unidirectional or multidirectional stretching at a certain temperature; Finally, heat setting is carried out above the melting tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L51/10C08F292/00C08F220/56B29C69/02B29B9/02
CPCC08L27/18C08F292/00B29C69/02B29B9/02C08L2201/04C08K2201/017C08L2203/18C08L51/10C08F220/56
Inventor 邱剑锷吴晓明
Owner ZHEJIANG DEQING CONCEPTFE PLASTIC PROD
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