Microporous polytetrafluoroethylene membrane for electronic communication sealing industry and preparation method for microporous polytetrafluoroethylene membrane

A technology of polytetrafluoroethylene and microporous membrane, which is applied in the field of sealing materials, can solve the problem of the difference in the size of micropores on the front and back of the membrane, and achieve the effect of preventing poisoning

Active Publication Date: 2014-03-05
HUZHOU SENNUO FLUORINE MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) PTFE membrane is an asymmetric membrane, and the size of the micropores on the front and back of the membrane is different.
[0010] Electronic communication tools such as mobile phones often need to use sealing materials in the manufacturing and production process. Polytetrafluoroethylene microporous membranes will have better results as sealing materials, but there is no mature technology to prepare them. PTFE microporous membrane specially used in electronic communication sealing industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method for a polytetrafluoroethylene microporous membrane used in the electronic communication sealing industry, comprising the following technical steps:

[0038] (1) Mixing: Add ExxonMobil’s ISOPARK as a hydrocarbon extrusion aid to the PTFE resin powder labeled F106 produced by Daikin Chemicals in Japan, and the weight ratio of the two is 1:0.25 The ratio of the mixture is fully mixed, and it is left to stand at 50°C for 24 hours to form a material;

[0039] (2) Billet making: pre-press the material into a cylindrical billet of Φ120mm at 50°C;

[0040] (3) Extrusion: Place the cylindrical billet on the pusher, and push it into a round bar of Φ22mm at 55°C;

[0041] (4) Calendering: place the round bar on a calender, and calender it at 70°C to form an oil-containing base belt with a thickness of 150 microns;

[0042] (5) Longitudinal stretching after degreasing treatment: degrease the oil-containing base tape at 260°C, remove the extrusion aid, and per...

Embodiment 2

[0048] A preparation method for a polytetrafluoroethylene microporous membrane used in the electronic communication sealing industry, comprising the following technical steps:

[0049] (1) Mixing: Add ExxonMobil’s ISOPARK as a hydrocarbon extrusion aid to the PTFE resin powder labeled FD3309 produced by DuPont in the United States, and the ratio of the two is 1:0.28 by weight. Mix and stand at 50°C for 24 hours to form a material;

[0050] (2) Billet making: pre-press the material into a cylindrical billet of Φ120mm at 50°C;

[0051] (3) Extrusion: Place the cylindrical billet on a pusher and push it into a round bar of Φ20mm at 60°C;

[0052] (4) Calendering: place the round bar on a calender, and calender it at 70°C to form an oil-containing base belt with a thickness of 120 microns;

[0053] (5) Longitudinal stretching after degreasing treatment: degrease the oil-containing base tape at 280°C, remove the extrusion aid, and carry out the first longitudinal stretching, and ...

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Abstract

The invention discloses a microporous polytetrafluoroethylene membrane for the electronic communication sealing industry and a preparation method for the microporous polytetrafluoroethylene membrane. The method comprises the following steps of (1) mixing; (2) blank forming; (3) extrusion; (4) calendering; (5) longitudinal drawing after degreasing treatment; (6) longitudinal drawing after surface treatment; (7) sintering and curing after transverse drawing; (8) multi-roll compositing; (9) sintering and curing; and (10) trimming and slitting. Compared with the prior art, the microporous polytetrafluoroethylene membrane for the electronic communication sealing industry and the preparation method for the microporous polytetrafluoroethylene membrane have the advantages that the microporous polytetrafluoroethylene membrane has an aperture being less than 0.45UM, density being 0.45 to 0.9g/cm<3>, a thickness being 0.1 to 1.5mm, porosity being 85 percent and high performance; when the material is used for the sealing of electronic communication equipment (such as a mobile phone), super high sealing performance, anti-seismic performance and corrosion resistance of PH0 to 14 can be achieved, a human body can also be prevented from hazards caused by electronic radiation, and the electronic communication equipment is waterproof and radiating.

Description

technical field [0001] The invention belongs to the technical field of sealing materials, and more specifically relates to a polytetrafluoroethylene microporous membrane used in the electronic communication sealing industry and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (abbreviated as PTFE) microporous membrane is a semi-finished product made of extruded polytetrafluoroethylene rods and strips, which are calendered into thin films, stretched at a temperature below the melting point, and heat-set to obtain a porous product. [0003] PTFE membrane has the following microstructure: [0004] (1) The surface morphology of PTFE microporous film has a spider web-like microporous structure. Pores are formed between the microfibers, and the arrangement direction of the microfibers is basically parallel to the stretching direction; the junction of the fiber bundles is the node, which is formed by the entanglement of many microfibers. [0005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/00
Inventor 王中华
Owner HUZHOU SENNUO FLUORINE MATERIAL TECH
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