Preparation method of polytetrafluoroethylene film doped with conducting particles

A technology of polytetrafluoroethylene and polytetrafluoroethylene powder, which is applied in the field of preparation of polytetrafluoroethylene films, can solve problems such as the inability to let out water vapor, achieve the effects of increasing microscopic current paths, ensuring stability, and improving mechanical strength

Inactive Publication Date: 2013-08-21
SINOMA SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the PTFE film made by the turning process has no penetrating micropores inside, and it is impossible for excess water vapor to leak out in some battery reactors or sealing electrode materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing a polytetrafluoroethylene film doped with conductive particles, comprising the steps of:

[0026] (1) After mixing aviation kerosene and carbon black, add it to the mixer for high-speed stirring and breaking up. The stirring speed of the mixer is 1500 rpm, and then add it to the polytetrafluoroethylene powder, and mix with the polytetrafluoroethylene powder Mix the materials evenly to obtain a mixed powder;

[0027] Above-mentioned material is composed as follows by mass percentage:

[0028] PTFE powder 70%

[0029] Aviation kerosene 20% carbon black 10%;

[0030] (2) The mixed powder obtained in step (1) is aged, preformed, pushed, and calendered, and the single-layer PTFE film is biaxially stretched 10 times and heat-set at 400°C to prepare polytetrafluoroethylene containing conductive particles. Film; the pore diameter of the polytetrafluoroethylene film doped with conductive particles prepared by the above method is 0.35 μm (tested by the b...

Embodiment 2

[0032] A method for preparing a polytetrafluoroethylene film doped with conductive particles, comprising the steps of:

[0033] (1) After mixing IsoparG solvent oil and carbon nanotubes, add them to the agitator for high-speed stirring to disperse. The ethylene powder is mixed evenly to obtain a mixed powder;

[0034] Above-mentioned material is composed as follows by mass percentage:

[0035] PTFE powder 70%

[0036] IsoparG mineral spirits 20% carbon nanotubes 10%;

[0037] (2) The mixed powder obtained in step (1) is aged, preformed, pushed, and calendered, and the single-layer PTFE film is biaxially stretched 8 times and heat-set at 330°C to prepare polytetrafluoroethylene containing conductive particles. Film; the pore diameter of the polytetrafluoroethylene film doped with conductive particles prepared by the above method is 0.41 μm (tested by the bubble point method), the tensile strength is 20 MPa, the elongation at break is 100%, the thickness is 29 μm, and the vol...

Embodiment 3

[0039] A method for preparing a polytetrafluoroethylene film doped with conductive particles, comprising the steps of:

[0040] (1) After mixing IsoparM solvent oil, carbon black and graphite, add it to the agitator for high-speed stirring and breaking up. The stirring speed of the agitator is 1000 rpm, and then add it to the polytetrafluoroethylene powder. The vinyl fluoride powder is mixed evenly to obtain a mixed powder;

[0041] Above-mentioned material is composed as follows by mass percentage:

[0042] PTFE powder 80%

[0043] IsoparM mineral spirits 15%

[0044] Carbon black 2.5%

[0045] Graphite 2.5%;

[0046] (2) The mixed powder obtained in step (1) is aged, preformed, pushed, and calendered, and the single-layer PTFE film is biaxially stretched 10 times and heat-set at 340°C to prepare polytetrafluoroethylene containing conductive particles. Film; the pore diameter of the polytetrafluoroethylene film doped with conductive particles prepared by the above method...

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Abstract

The invention relates to a preparation method of a polytetrafluoroethylene film doped with conducting particles. The method comprises the following steps that (1) an auxiliary agent and the conducting particles are stirred and scattered at a high speed after mixed, then added to polytetrafluoroethylene powder, and uniformly mixed with the polytetrafluoroethylene powder; mixed powder is obtained; and (2) the polytetrafluoroethylene film doped with the conducting particles is obtained by aging, preforming, pushing, calendaring, bidirectionally stretching and thermoforming the mixed powder obtained in Step (1). The conducting particles are added to the polytetrafluoroethylene powder, and proportions of different raw materials are changed, so that the quantity and the distribution of the conducting particles under the condition of applied voltage are increased and improved, microscopic current paths are increased, and a purpose of improving the conductivity of the polytetrafluoroethylene film is achieved; distributed electrodeless nano particles can serve as island-distributed macroscopic nodes between the films, and exert effects of supporting and dispersing an acting force after high-temperature forming; the mechanical strength of the film can be improved; and the performance stability of the composite film is ensured.

Description

technical field [0001] The invention belongs to the field of plastic molding processing, and in particular relates to a preparation method of a polytetrafluoroethylene film doped with conductive particles. Background technique [0002] Carbon-filled polytetrafluoroethylene (PTFE) electrodes and electrode assemblies offer distinct advantages to battery and electrochemical double layer capacitor (EDLC) manufacturers. Combining high carbon content with high strength produces electrodes that not only provide maximum power and capacitance, but also withstand the stress of high-speed and mass production, thereby reducing waste. This unique combination can be used to design the smallest and lightest Batteries / electrochemical double-layer capacitors, and the production efficiency is also outstanding. In addition, customized as planar or beaded according to the desired battery or EDLC structure, they can be directly bonded to the current collector to make a single-sided or double-si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K3/04C08K7/00C08K3/22C08K3/30
Inventor 董浩宇白耀宗范凌云黄箭玲赵东波周群费传军黎鹏杨振东
Owner SINOMA SCI & TECH
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