A kind of antistatic polytetrafluoroethylene film and preparation method thereof

A polytetrafluoroethylene and antistatic technology, which is applied in the field of antistatic polytetrafluoroethylene film and its preparation, can solve the problems of non-uniform distribution of inorganic nano-metal conductive powder, and achieve increased conductivity uniformity, uniform pore size distribution, and porosity large effect

Active Publication Date: 2021-01-15
SHANGHAI LINFLON FILM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the inorganic nano-metal conductive powder cannot be uniformly distributed on the polytetrafluoroethylene film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of antistatic polytetrafluoroethylene film, comprises the component of following mass fraction:

[0031] Polytetrafluoroethylene dispersion resin 75% to 90%;

[0032] Nano metal conductive powder 5% to 20%;

[0033] Nano-graphite 1% to 5%.

[0034] Preferably, the mass fraction of the polytetrafluoroethylene dispersion resin is 80%-88%, the mass fraction of the nano metal conductive powder is 12%-16%, and the mass fraction of the nano-graphite is 2%-3%.

[0035] Wherein, the nano-metal conductive powder includes any one or more of nano-aluminum powder, nano-copper powder or nano-iron powder.

[0036] Preferably, the particle diameter of the nano metal conductive powder is 20-100 nm. Preferably, the particle diameter of the nano metal conductive powder is 30-50 nm. The particle size of the nano-graphite is 0-10 nm.

[0037] Its preparation method is as follows:

[0038] Step 1, mixing polytetrafluoroethylene powder and extrusion aid uniformly, standing and p...

Embodiment 2

[0045] A kind of antistatic polytetrafluoroethylene film, comprises the component of following mass fraction

[0046] PTFE dispersion resin 85%;

[0047] Nano aluminum powder 12%; its particle size is 50nm.

[0048] Nanographite 3%; its particle size is 10nm.

[0049] Its preparation method is with embodiment 1, and the process parameter of the present embodiment is as follows:

[0050] In step 2, add nano conductive aluminum powder;

[0051] In step 3, make a base tape with a thickness of 0.27mm;

[0052] In step 4, the degreasing temperature is 150°C, and the drawing temperature is 200°C;

[0053] In step five, the draw ratio is 17 times, and the drawing temperature is 200°C;

[0054] In step six, the drafting ratio is 18 times.

[0055] The surface specific resistance of the antistatic polytetrafluoroethylene microporous membrane that present embodiment makes is 8.46*10 7 Ω. Air permeability is 96L / dm 2 *min, porosity 85%.

Embodiment 3

[0057] A kind of antistatic polytetrafluoroethylene film, comprises the component of following mass fraction

[0058] PTFE dispersion resin 90%;

[0059] Nano-aluminum powder 8.5%; its particle size is 50nm.

[0060] Nanographite 1.5%; its particle size is 10nm.

[0061] Its preparation method is with embodiment 1, and the process parameter of the present embodiment is as follows:

[0062] In step 2, add nano-aluminum powder;

[0063] In step 3, make a base tape with a thickness of 0.27mm;

[0064] In step 4, the degreasing temperature is 150°C, and the input speed is 12m / min;

[0065] In step five, the draw ratio is 17 times, and the drawing temperature is 200°C;

[0066] In step six, the drafting ratio is 18 times.

[0067] The surface specific resistance of the antistatic polytetrafluoroethylene film that this implementation makes is 1.45*10 9 Ω, the air permeability is 103L / dm 2 *min, porosity 86%.

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Abstract

The invention discloses an antistatic polytetrafluoroethylene film which comprises the following components in percentage by mass: 75-95% of polytetrafluoroethylene dispersion resin, 5%-20% of nano metal electric-conductive powder, 1%-5% of nano graphite. The invention discloses a preparation method of the polytetrafluoroethylene film. In the antistatic polytetrafluoroethylene film, the nano aluminum powder is coated with the nano graphite, so that the lubricity of the conductive powder is improved; and then the conductive nano powder is clamped between the two layers of films in a sandwich layer form, so that the fiber-node form of the polytetrafluoroethylene film is not influenced. The polytetrafluoroethylene film is good in flux and large in porosity.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene film, in particular to an antistatic polytetrafluoroethylene film and a preparation method thereof. Background technique [0002] PTFE membrane has excellent chemical stability, high and low temperature resistance, non-stick properties, etc., and its small pore size, high porosity, and large flux are widely used in the field of filtration and separation. However, due to the low strength, poor wear resistance and significant static electricity accumulation of PTFE film, its performance and service life are affected, which limits its application to a certain extent. [0003] The researchers physically modified the PTFE film by adding nanoparticles to the raw material to overcome the above weaknesses. In the publication number CN1203610, Gore Company proposes to fill micro-voids with nano-scale particles, such as stretched polytetrafluoroethylene film. The preparation method is to mix a certain amount of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08K3/08C08K3/04C08J5/18
Inventor 陈银青薛士临陈迎妹张建军
Owner SHANGHAI LINFLON FILM TECH
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